text: /*
   * MJPEG decoder
   * Copyright (c) 2000, 2001 Fabrice Bellard
   * Copyright (c) 2003 Alex Beregszaszi
   * Copyright (c) 2003-2004 Michael Niedermayer
   *
   * Support for external huffman table, various fixes (AVID workaround),
   * aspecting, new decode_frame mechanism and apple mjpeg-b support
   *                                  by Alex Beregszaszi
   *
   * This file is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  /**
   * @file
   * MJPEG decoder.
   */
  
  #include "libavutil/imgutils.h"
  #include "libavutil/avassert.h"
  #include "libavutil/opt.h"
  #include "avcodec.h"
  #include "blockdsp.h"
  #include "copy_block.h"
  #include "idctdsp.h"
  #include "internal.h"
  #include "jpegtables.h"
  #include "mjpeg.h"
  #include "mjpegdec.h"
  #include "jpeglsdec.h"
  #include "put_bits.h"
  #include "tiff.h"
  #include "exif.h"
  #include "bytestream.h"
  
  
  static int build_vlc(VLC *vlc, const uint8_t *bits_table,
                       const uint8_t *val_table, int nb_codes,
                       int use_static, int is_ac)
  {
      uint8_t huff_size[256] = { 0 };
      uint16_t huff_code[256];
      uint16_t huff_sym[256];
      int i;
  
      av_assert0(nb_codes <= 256);
  
      ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
  
      for (i = 0; i < 256; i++)
          huff_sym[i] = i + 16 * is_ac;
  
      if (is_ac)
          huff_sym[0] = 16 * 256;
  
      return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
                                huff_code, 2, 2, huff_sym, 2, 2, use_static);
  }
  
  static int build_basic_mjpeg_vlc(MJpegDecodeContext *s)
  {
      int ret;
  
      if ((ret = build_vlc(&s->vlcs[0][0], avpriv_mjpeg_bits_dc_luminance,
                           avpriv_mjpeg_val_dc, 12, 0, 0)) < 0)
          return ret;
  
      if ((ret = build_vlc(&s->vlcs[0][1], avpriv_mjpeg_bits_dc_chrominance,
                           avpriv_mjpeg_val_dc, 12, 0, 0)) < 0)
          return ret;
  
      if ((ret = build_vlc(&s->vlcs[1][0], avpriv_mjpeg_bits_ac_luminance,
                           avpriv_mjpeg_val_ac_luminance, 251, 0, 1)) < 0)
          return ret;
  
      if ((ret = build_vlc(&s->vlcs[1][1], avpriv_mjpeg_bits_ac_chrominance,
                           avpriv_mjpeg_val_ac_chrominance, 251, 0, 1)) < 0)
          return ret;
  
      if ((ret = build_vlc(&s->vlcs[2][0], avpriv_mjpeg_bits_ac_luminance,
                           avpriv_mjpeg_val_ac_luminance, 251, 0, 0)) < 0)
          return ret;
  
      if ((ret = build_vlc(&s->vlcs[2][1], avpriv_mjpeg_bits_ac_chrominance,
                           avpriv_mjpeg_val_ac_chrominance, 251, 0, 0)) < 0)
          return ret;
  
  
      return 0;
  }
  
  static void parse_avid(MJpegDecodeContext *s, uint8_t *buf, int len)
  {
      s->buggy_avid = 1;
      if (len > 14 && buf[12] == 1) /* 1 - NTSC */
          s->interlace_polarity = 1;
      if (len > 14 && buf[12] == 2) /* 2 - PAL */
          s->interlace_polarity = 0;
      if (s->avctx->debug & FF_DEBUG_PICT_INFO)
          av_log(s->avctx, AV_LOG_INFO, "AVID: len:%d %d\n", len, len > 14 ? buf[12] : -1);
  }
  
  static void init_idct(AVCodecContext *avctx)
  {
      MJpegDecodeContext *s = avctx->priv_data;
  
      ff_idctdsp_init(&s->idsp, avctx);
      ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
                        ff_zigzag_direct);
  }
  
  av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
  {
      MJpegDecodeContext *s = avctx->priv_data;
      int ret;
  
      if (!s->picture_ptr) {
          s->picture = av_frame_alloc();
          if (!s->picture)
              return AVERROR(ENOMEM);
          s->picture_ptr = s->picture;
      }
  
      s->avctx = avctx;
      ff_blockdsp_init(&s->bdsp, avctx);
      ff_hpeldsp_init(&s->hdsp, avctx->flags);
      init_idct(avctx);
      s->buffer_size   = 0;
      s->buffer        = NULL;
      s->start_code    = -1;
      s->first_picture = 1;
      s->got_picture   = 0;
      s->org_height    = avctx->coded_height;
      avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
      avctx->colorspace = AVCOL_SPC_BT470BG;
  
      if ((ret = build_basic_mjpeg_vlc(s)) < 0)
          return ret;
  
      if (s->extern_huff) {
          av_log(avctx, AV_LOG_INFO, "using external huffman table\n");
          if ((ret = init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8)) < 0)
              return ret;
          if (ff_mjpeg_decode_dht(s)) {
              av_log(avctx, AV_LOG_ERROR,
                     "error using external huffman table, switching back to internal\n");
              build_basic_mjpeg_vlc(s);
          }
      }
      if (avctx->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */
          s->interlace_polarity = 1;           /* bottom field first */
          av_log(avctx, AV_LOG_DEBUG, "bottom field first\n");
      } else if (avctx->field_order == AV_FIELD_UNKNOWN) {
          if (avctx->codec_tag == AV_RL32("MJPG"))
              s->interlace_polarity = 1;
      }
  
      if (   avctx->extradata_size > 8
          && AV_RL32(avctx->extradata) == 0x2C
          && AV_RL32(avctx->extradata+4) == 0x18) {
          parse_avid(s, avctx->extradata, avctx->extradata_size);
      }
  
      if (avctx->codec->id == AV_CODEC_ID_AMV)
          s->flipped = 1;
  
      return 0;
  }
  
  
  /* quantize tables */
  int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
  {
      int len, index, i;
  
      len = get_bits(&s->gb, 16) - 2;
  
      if (8*len > get_bits_left(&s->gb)) {
          av_log(s->avctx, AV_LOG_ERROR, "dqt: len %d is too large\n", len);
          return AVERROR_INVALIDDATA;
      }
  
      while (len >= 65) {
          int pr = get_bits(&s->gb, 4);
          if (pr > 1) {
              av_log(s->avctx, AV_LOG_ERROR, "dqt: invalid precision\n");
              return AVERROR_INVALIDDATA;
          }
          index = get_bits(&s->gb, 4);
          if (index >= 4)
              return -1;
          av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
          /* read quant table */
          for (i = 0; i < 64; i++) {
              s->quant_matrixes[index][i] = get_bits(&s->gb, pr ? 16 : 8);
              if (s->quant_matrixes[index][i] == 0) {
                  av_log(s->avctx, AV_LOG_ERROR, "dqt: 0 quant value\n");
                  return AVERROR_INVALIDDATA;
              }
          }
  
          // XXX FIXME fine-tune, and perhaps add dc too
          s->qscale[index] = FFMAX(s->quant_matrixes[index][1],
                                   s->quant_matrixes[index][8]) >> 1;
          av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",
                 index, s->qscale[index]);
          len -= 1 + 64 * (1+pr);
      }
      return 0;
  }
  
  /* decode huffman tables and build VLC decoders */
  int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
  {
      int len, index, i, class, n, v, code_max;
      uint8_t bits_table[17];
      uint8_t val_table[256];
      int ret = 0;
  
      len = get_bits(&s->gb, 16) - 2;
  
      if (8*len > get_bits_left(&s->gb)) {
          av_log(s->avctx, AV_LOG_ERROR, "dht: len %d is too large\n", len);
          return AVERROR_INVALIDDATA;
      }
  
      while (len > 0) {
          if (len < 17)
              return AVERROR_INVALIDDATA;
          class = get_bits(&s->gb, 4);
          if (class >= 2)
              return AVERROR_INVALIDDATA;
          index = get_bits(&s->gb, 4);
          if (index >= 4)
              return AVERROR_INVALIDDATA;
          n = 0;
          for (i = 1; i <= 16; i++) {
              bits_table[i] = get_bits(&s->gb, 8);
              n += bits_table[i];
          }
          len -= 17;
          if (len < n || n > 256)
              return AVERROR_INVALIDDATA;
  
          code_max = 0;
          for (i = 0; i < n; i++) {
              v = get_bits(&s->gb, 8);
              if (v > code_max)
                  code_max = v;
              val_table[i] = v;
          }
          len -= n;
  
          /* build VLC and flush previous vlc if present */
          ff_free_vlc(&s->vlcs[class][index]);
          av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
                 class, index, code_max + 1);
          if ((ret = build_vlc(&s->vlcs[class][index], bits_table, val_table,
                               code_max + 1, 0, class > 0)) < 0)
              return ret;
  
          if (class > 0) {
              ff_free_vlc(&s->vlcs[2][index]);
              if ((ret = build_vlc(&s->vlcs[2][index], bits_table, val_table,
                                   code_max + 1, 0, 0)) < 0)
                  return ret;
          }
      }
      return 0;
  }
  
  int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
  {
      int len, nb_components, i, width, height, bits, ret;
      unsigned pix_fmt_id;
      int h_count[MAX_COMPONENTS] = { 0 };
      int v_count[MAX_COMPONENTS] = { 0 };
  
      s->cur_scan = 0;
      memset(s->upscale_h, 0, sizeof(s->upscale_h));
      memset(s->upscale_v, 0, sizeof(s->upscale_v));
  
      /* XXX: verify len field validity */
      len     = get_bits(&s->gb, 16);
      bits    = get_bits(&s->gb, 8);
  
      if (bits > 16 || bits < 1) {
          av_log(s->avctx, AV_LOG_ERROR, "bits %d is invalid\n", bits);
          return AVERROR_INVALIDDATA;
      }
  
      if (s->avctx->bits_per_raw_sample != bits) {
          av_log(s->avctx, s->avctx->bits_per_raw_sample > 0 ? AV_LOG_INFO : AV_LOG_DEBUG, "Changing bps from %d to %d\n", s->avctx->bits_per_raw_sample, bits);
          s->avctx->bits_per_raw_sample = bits;
          init_idct(s->avctx);
      }
      if (s->pegasus_rct)
          bits = 9;
      if (bits == 9 && !s->pegasus_rct)
          s->rct  = 1;    // FIXME ugly
  
      if(s->lossless && s->avctx->lowres){
          av_log(s->avctx, AV_LOG_ERROR, "lowres is not possible with lossless jpeg\n");
          return -1;
      }
  
      height = get_bits(&s->gb, 16);
      width  = get_bits(&s->gb, 16);
  
      // HACK for odd_height.mov
      if (s->interlaced && s->width == width && s->height == height + 1)
          height= s->height;
  
      av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
      if (av_image_check_size(width, height, 0, s->avctx) < 0)
          return AVERROR_INVALIDDATA;
      if (s->buf_size && (width + 7) / 8 * ((height + 7) / 8) > s->buf_size * 4LL)
          return AVERROR_INVALIDDATA;
  
      nb_components = get_bits(&s->gb, 8);
      if (nb_components <= 0 ||
          nb_components > MAX_COMPONENTS)
          return -1;
      if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
          if (nb_components != s->nb_components) {
              av_log(s->avctx, AV_LOG_ERROR,
                     "nb_components changing in interlaced picture\n");
              return AVERROR_INVALIDDATA;
          }
      }
      if (s->ls && !(bits <= 8 || nb_components == 1)) {
          avpriv_report_missing_feature(s->avctx,
                                        "JPEG-LS that is not <= 8 "
                                        "bits/component or 16-bit gray");
          return AVERROR_PATCHWELCOME;
      }
      s->nb_components = nb_components;
      s->h_max         = 1;
      s->v_max         = 1;
      for (i = 0; i < nb_components; i++) {
          /* component id */
          s->component_id[i] = get_bits(&s->gb, 8) - 1;
          h_count[i]         = get_bits(&s->gb, 4);
          v_count[i]         = get_bits(&s->gb, 4);
          /* compute hmax and vmax (only used in interleaved case) */
          if (h_count[i] > s->h_max)
              s->h_max = h_count[i];
          if (v_count[i] > s->v_max)
              s->v_max = v_count[i];
          s->quant_index[i] = get_bits(&s->gb, 8);
          if (s->quant_index[i] >= 4) {
              av_log(s->avctx, AV_LOG_ERROR, "quant_index is invalid\n");
              return AVERROR_INVALIDDATA;
          }
          if (!h_count[i] || !v_count[i]) {
              av_log(s->avctx, AV_LOG_ERROR,
                     "Invalid sampling factor in component %d %d:%d\n",
                     i, h_count[i], v_count[i]);
              return AVERROR_INVALIDDATA;
          }
  
          av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
                 i, h_count[i], v_count[i],
                 s->component_id[i], s->quant_index[i]);
      }
      if (   nb_components == 4
          && s->component_id[0] == 'C' - 1
          && s->component_id[1] == 'M' - 1
          && s->component_id[2] == 'Y' - 1
          && s->component_id[3] == 'K' - 1)
          s->adobe_transform = 0;
  
      if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
          avpriv_report_missing_feature(s->avctx, "Subsampling in JPEG-LS");
          return AVERROR_PATCHWELCOME;
      }
  
  
      /* if different size, realloc/alloc picture */
      if (width != s->width || height != s->height || bits != s->bits ||
          memcmp(s->h_count, h_count, sizeof(h_count))                ||
          memcmp(s->v_count, v_count, sizeof(v_count))) {
  
          s->width      = width;
          s->height     = height;
          s->bits       = bits;
          memcpy(s->h_count, h_count, sizeof(h_count));
          memcpy(s->v_count, v_count, sizeof(v_count));
          s->interlaced = 0;
          s->got_picture = 0;
  
          /* test interlaced mode */
          if (s->first_picture   &&
              (s->multiscope != 2 || s->avctx->time_base.den >= 25 * s->avctx->time_base.num) &&
              s->org_height != 0 &&
              s->height < ((s->org_height * 3) / 4)) {
              s->interlaced                    = 1;
              s->bottom_field                  = s->interlace_polarity;
              s->picture_ptr->interlaced_frame = 1;
              s->picture_ptr->top_field_first  = !s->interlace_polarity;
              height *= 2;
          }
  
          ret = ff_set_dimensions(s->avctx, width, height);
          if (ret < 0)
              return ret;
  
          s->first_picture = 0;
      }
  
      if (s->got_picture && s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
          if (s->progressive) {
              avpriv_request_sample(s->avctx, "progressively coded interlaced picture");
              return AVERROR_INVALIDDATA;
          }
      } else{
          if (s->v_max == 1 && s->h_max == 1 && s->lossless==1 && (nb_components==3 || nb_components==4))
              s->rgb = 1;
          else if (!s->lossless)
              s->rgb = 0;
      /* XXX: not complete test ! */
      pix_fmt_id = ((unsigned)s->h_count[0] << 28) | (s->v_count[0] << 24) |
                   (s->h_count[1] << 20) | (s->v_count[1] << 16) |
                   (s->h_count[2] << 12) | (s->v_count[2] <<  8) |
                   (s->h_count[3] <<  4) |  s->v_count[3];
      av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
      /* NOTE we do not allocate pictures large enough for the possible
       * padding of h/v_count being 4 */
      if (!(pix_fmt_id & 0xD0D0D0D0))
          pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
      if (!(pix_fmt_id & 0x0D0D0D0D))
          pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
  
      for (i = 0; i < 8; i++) {
          int j = 6 + (i&1) - (i&6);
          int is = (pix_fmt_id >> (4*i)) & 0xF;
          int js = (pix_fmt_id >> (4*j)) & 0xF;
  
          if (is == 1 && js != 2 && (i < 2 || i > 5))
              js = (pix_fmt_id >> ( 8 + 4*(i&1))) & 0xF;
          if (is == 1 && js != 2 && (i < 2 || i > 5))
              js = (pix_fmt_id >> (16 + 4*(i&1))) & 0xF;
  
          if (is == 1 && js == 2) {
              if (i & 1) s->upscale_h[j/2] = 1;
              else       s->upscale_v[j/2] = 1;
          }
      }
  
      switch (pix_fmt_id) {
      case 0x11111100:
          if (s->rgb)
              s->avctx->pix_fmt = s->bits <= 9 ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_BGR48;
          else {
              if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
                  s->avctx->pix_fmt = s->bits <= 8 ? AV_PIX_FMT_GBRP : AV_PIX_FMT_GBRP16;
              } else {
                  if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
                  else              s->avctx->pix_fmt = AV_PIX_FMT_YUV444P16;
              s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
              }
          }
          av_assert0(s->nb_components == 3);
          break;
      case 0x11111111:
          if (s->rgb)
              s->avctx->pix_fmt = s->bits <= 9 ? AV_PIX_FMT_ABGR : AV_PIX_FMT_RGBA64;
          else {
              if (s->adobe_transform == 0 && s->bits <= 8) {
                  s->avctx->pix_fmt = AV_PIX_FMT_GBRAP;
              } else {
                  s->avctx->pix_fmt = s->bits <= 8 ? AV_PIX_FMT_YUVA444P : AV_PIX_FMT_YUVA444P16;
                  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
              }
          }
          av_assert0(s->nb_components == 4);
          break;
      case 0x22111122:
      case 0x22111111:
          if (s->adobe_transform == 0 && s->bits <= 8) {
              s->avctx->pix_fmt = AV_PIX_FMT_GBRAP;
              s->upscale_v[1] = s->upscale_v[2] = 1;
              s->upscale_h[1] = s->upscale_h[2] = 1;
          } else if (s->adobe_transform == 2 && s->bits <= 8) {
              s->avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
              s->upscale_v[1] = s->upscale_v[2] = 1;
              s->upscale_h[1] = s->upscale_h[2] = 1;
              s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
          } else {
              if (s->bits <= 8) s->avctx->pix_fmt = AV_PIX_FMT_YUVA420P;
              else              s->avctx->pix_fmt = AV_PIX_FMT_YUVA420P16;
              s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
          }
          av_assert0(s->nb_components == 4);
          break;
      case 0x12121100:
      case 0x22122100:
      case 0x21211100:
      case 0x22211200:
          if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
          else
              goto unk_pixfmt;
          s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
          break;
      case 0x22221100:
      case 0x22112200:
      case 0x11222200:
          if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
          else
              goto unk_pixfmt;
          s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
          break;
      case 0x11000000:
      case 0x13000000:
      case 0x14000000:
      case 0x31000000:
      case 0x33000000:
      case 0x34000000:
      case 0x41000000:
      case 0x43000000:
      case 0x44000000:
          if(s->bits <= 8)
              s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
          else
              s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
          break;
      case 0x12111100:
      case 0x14121200:
      case 0x14111100:
      case 0x22211100:
      case 0x22112100:
          if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
              if (s->bits <= 8) s->avctx->pix_fmt = AV_PIX_FMT_GBRP;
              else
                  goto unk_pixfmt;
              s->upscale_v[0] = s->upscale_v[1] = 1;
          } else {
              if (pix_fmt_id == 0x14111100)
                  s->upscale_v[1] = s->upscale_v[2] = 1;
              if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV440P : AV_PIX_FMT_YUVJ440P;
              else
                  goto unk_pixfmt;
              s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
          }
          break;
      case 0x21111100:
          if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
              if (s->bits <= 8) s->avctx->pix_fmt = AV_PIX_FMT_GBRP;
              else
                  goto unk_pixfmt;
              s->upscale_h[0] = s->upscale_h[1] = 1;
          } else {
              if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P;
              else              s->avctx->pix_fmt = AV_PIX_FMT_YUV422P16;
              s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
          }
          break;
      case 0x31111100:
          if (s->bits > 8)
              goto unk_pixfmt;
          s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
          s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
          s->upscale_h[1] = s->upscale_h[2] = 2;
          break;
      case 0x22121100:
      case 0x22111200:
          if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P;
          else
              goto unk_pixfmt;
          s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
          break;
      case 0x22111100:
      case 0x42111100:
      case 0x24111100:
          if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV420P : AV_PIX_FMT_YUVJ420P;
          else              s->avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
          s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
          if (pix_fmt_id == 0x42111100) {
              if (s->bits > 8)
                  goto unk_pixfmt;
              s->upscale_h[1] = s->upscale_h[2] = 1;
          } else if (pix_fmt_id == 0x24111100) {
              if (s->bits > 8)
                  goto unk_pixfmt;
              s->upscale_v[1] = s->upscale_v[2] = 1;
          }
          break;
      case 0x41111100:
          if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV411P : AV_PIX_FMT_YUVJ411P;
          else
              goto unk_pixfmt;
          s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
          break;
      default:
  unk_pixfmt:
          avpriv_report_missing_feature(s->avctx, "Pixel format 0x%x bits:%d", pix_fmt_id, s->bits);
          memset(s->upscale_h, 0, sizeof(s->upscale_h));
          memset(s->upscale_v, 0, sizeof(s->upscale_v));
          return AVERROR_PATCHWELCOME;
      }
      if ((AV_RB32(s->upscale_h) || AV_RB32(s->upscale_v)) && s->avctx->lowres) {
          avpriv_report_missing_feature(s->avctx, "Lowres for weird subsampling");
          return AVERROR_PATCHWELCOME;
      }
      if ((AV_RB32(s->upscale_h) || AV_RB32(s->upscale_v)) && s->progressive && s->avctx->pix_fmt == AV_PIX_FMT_GBRP) {
          avpriv_report_missing_feature(s->avctx, "progressive for weird subsampling");
          return AVERROR_PATCHWELCOME;
      }
      if (s->ls) {
          memset(s->upscale_h, 0, sizeof(s->upscale_h));
          memset(s->upscale_v, 0, sizeof(s->upscale_v));
          if (s->nb_components == 3) {
              s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
          } else if (s->nb_components != 1) {
              av_log(s->avctx, AV_LOG_ERROR, "Unsupported number of components %d\n", s->nb_components);
              return AVERROR_PATCHWELCOME;
          } else if (s->palette_index && s->bits <= 8)
              s->avctx->pix_fmt = AV_PIX_FMT_PAL8;
          else if (s->bits <= 8)
              s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
          else
              s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
      }
  
      s->pix_desc = av_pix_fmt_desc_get(s->avctx->pix_fmt);
      if (!s->pix_desc) {
          av_log(s->avctx, AV_LOG_ERROR, "Could not get a pixel format descriptor.\n");
          return AVERROR_BUG;
      }
  
      if (s->avctx->skip_frame == AVDISCARD_ALL) {
          s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
          s->picture_ptr->key_frame = 1;
          s->got_picture            = 1;
          return 0;
      }
  
      av_frame_unref(s->picture_ptr);
      if (ff_get_buffer(s->avctx, s->picture_ptr, AV_GET_BUFFER_FLAG_REF) < 0)
          return -1;
      s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
      s->picture_ptr->key_frame = 1;
      s->got_picture            = 1;
  
      for (i = 0; i < 4; i++)
          s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
  
      ff_dlog(s->avctx, "%d %d %d %d %d %d\n",
              s->width, s->height, s->linesize[0], s->linesize[1],
              s->interlaced, s->avctx->height);
  
      if (len != (8 + (3 * nb_components)))
          av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
      }
  
      if ((s->rgb && !s->lossless && !s->ls) ||
          (!s->rgb && s->ls && s->nb_components > 1)) {
          av_log(s->avctx, AV_LOG_ERROR, "Unsupported coding and pixel format combination\n");
          return AVERROR_PATCHWELCOME;
      }
  
      /* totally blank picture as progressive JPEG will only add details to it */
      if (s->progressive) {
          int bw = (width  + s->h_max * 8 - 1) / (s->h_max * 8);
          int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
          for (i = 0; i < s->nb_components; i++) {
              int size = bw * bh * s->h_count[i] * s->v_count[i];
              av_freep(&s->blocks[i]);
              av_freep(&s->last_nnz[i]);
              s->blocks[i]       = av_mallocz_array(size, sizeof(**s->blocks));
              s->last_nnz[i]     = av_mallocz_array(size, sizeof(**s->last_nnz));
              if (!s->blocks[i] || !s->last_nnz[i])
                  return AVERROR(ENOMEM);
              s->block_stride[i] = bw * s->h_count[i];
          }
          memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
      }
      return 0;
  }
  
  static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
  {
      int code;
      code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
      if (code < 0 || code > 16) {
          av_log(s->avctx, AV_LOG_WARNING,
                 "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
                 0, dc_index, &s->vlcs[0][dc_index]);
          return 0xfffff;
      }
  
      if (code)
          return get_xbits(&s->gb, code);
      else
          return 0;
  }
  
  /* decode block and dequantize */
  static int decode_block(MJpegDecodeContext *s, int16_t *block, int component,
                          int dc_index, int ac_index, uint16_t *quant_matrix)
  {
      int code, i, j, level, val;
  
      /* DC coef */
      val = mjpeg_decode_dc(s, dc_index);
      if (val == 0xfffff) {
          av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
          return AVERROR_INVALIDDATA;
      }
      val = val * (unsigned)quant_matrix[0] + s->last_dc[component];
      val = av_clip_int16(val);
      s->last_dc[component] = val;
      block[0] = val;
      /* AC coefs */
      i = 0;
      {OPEN_READER(re, &s->gb);
      do {
          UPDATE_CACHE(re, &s->gb);
          GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
  
          i += ((unsigned)code) >> 4;
              code &= 0xf;
          if (code) {
              if (code > MIN_CACHE_BITS - 16)
                  UPDATE_CACHE(re, &s->gb);
  
              {
                  int cache = GET_CACHE(re, &s->gb);
                  int sign  = (~cache) >> 31;
                  level     = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
              }
  
              LAST_SKIP_BITS(re, &s->gb, code);
  
              if (i > 63) {
                  av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
                  return AVERROR_INVALIDDATA;
              }
              j        = s->scantable.permutated[i];
              block[j] = level * quant_matrix[i];
          }
      } while (i < 63);
      CLOSE_READER(re, &s->gb);}
  
      return 0;
  }
  
  static int decode_dc_progressive(MJpegDecodeContext *s, int16_t *block,
                                   int component, int dc_index,
                                   uint16_t *quant_matrix, int Al)
  {
      unsigned val;
      s->bdsp.clear_block(block);
      val = mjpeg_decode_dc(s, dc_index);
      if (val == 0xfffff) {
          av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
          return AVERROR_INVALIDDATA;
      }
      val = (val * (quant_matrix[0] << Al)) + s->last_dc[component];
      s->last_dc[component] = val;
      block[0] = val;
      return 0;
  }
  
  /* decode block and dequantize - progressive JPEG version */
  static int decode_block_progressive(MJpegDecodeContext *s, int16_t *block,
                                      uint8_t *last_nnz, int ac_index,
                                      uint16_t *quant_matrix,
                                      int ss, int se, int Al, int *EOBRUN)
  {
      int code, i, j, val, run;
      unsigned level;
  
      if (*EOBRUN) {
          (*EOBRUN)--;
          return 0;
      }
  
      {
          OPEN_READER(re, &s->gb);
          for (i = ss; ; i++) {
              UPDATE_CACHE(re, &s->gb);
              GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
  
              run = ((unsigned) code) >> 4;
              code &= 0xF;
              if (code) {
                  i += run;
                  if (code > MIN_CACHE_BITS - 16)
                      UPDATE_CACHE(re, &s->gb);
  
                  {
                      int cache = GET_CACHE(re, &s->gb);
                      int sign  = (~cache) >> 31;
                      level     = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
                  }
  
                  LAST_SKIP_BITS(re, &s->gb, code);
  
                  if (i >= se) {
                      if (i == se) {
                          j = s->scantable.permutated[se];
                          block[j] = level * (quant_matrix[se] << Al);
                          break;
                      }
                      av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
                      return AVERROR_INVALIDDATA;
                  }
                  j = s->scantable.permutated[i];
                  block[j] = level * (quant_matrix[i] << Al);
              } else {
                  if (run == 0xF) {// ZRL - skip 15 coefficients
                      i += 15;
                      if (i >= se) {
                          av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
                          return AVERROR_INVALIDDATA;
                      }
                  } else {
                      val = (1 << run);
                      if (run) {
                          UPDATE_CACHE(re, &s->gb);
                          val += NEG_USR32(GET_CACHE(re, &s->gb), run);
                          LAST_SKIP_BITS(re, &s->gb, run);
                      }
                      *EOBRUN = val - 1;
                      break;
                  }
              }
          }
          CLOSE_READER(re, &s->gb);
      }
  
      if (i > *last_nnz)
          *last_nnz = i;
  
      return 0;
  }
  
  #define REFINE_BIT(j) {                                             \
      UPDATE_CACHE(re, &s->gb);                                       \
      sign = block[j] >> 15;                                          \
      block[j] += SHOW_UBITS(re, &s->gb, 1) *                         \
                  ((quant_matrix[i] ^ sign) - sign) << Al;            \
      LAST_SKIP_BITS(re, &s->gb, 1);                                  \
  }
  
  #define ZERO_RUN                                                    \
  for (; ; i++) {                                                     \
      if (i > last) {                                                 \
          i += run;                                                   \
          if (i > se) {                                               \
              av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
              return -1;                                              \
          }                                                           \
          break;                                                      \
      }                                                               \
      j = s->scantable.permutated[i];                                 \
      if (block[j])                                                   \
          REFINE_BIT(j)                                               \
      else if (run-- == 0)                                            \
          break;                                                      \
  }
  
  /* decode block and dequantize - progressive JPEG refinement pass */
  static int decode_block_refinement(MJpegDecodeContext *s, int16_t *block,
                                     uint8_t *last_nnz,
                                     int ac_index, uint16_t *quant_matrix,
                                     int ss, int se, int Al, int *EOBRUN)
  {
      int code, i = ss, j, sign, val, run;
      int last    = FFMIN(se, *last_nnz);
  
      OPEN_READER(re, &s->gb);
      if (*EOBRUN) {
          (*EOBRUN)--;
      } else {
          for (; ; i++) {
              UPDATE_CACHE(re, &s->gb);
              GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
  
              if (code & 0xF) {
                  run = ((unsigned) code) >> 4;
                  UPDATE_CACHE(re, &s->gb);
                  val = SHOW_UBITS(re, &s->gb, 1);
                  LAST_SKIP_BITS(re, &s->gb, 1);
                  ZERO_RUN;
                  j = s->scantable.permutated[i];
                  val--;
                  block[j] = ((quant_matrix[i] << Al) ^ val) - val;
                  if (i == se) {
                      if (i > *last_nnz)
                          *last_nnz = i;
                      CLOSE_READER(re, &s->gb);
                      return 0;
                  }
              } else {
                  run = ((unsigned) code) >> 4;
                  if (run == 0xF) {
                      ZERO_RUN;
                  } else {
                      val = run;
                      run = (1 << run);
                      if (val) {
                          UPDATE_CACHE(re, &s->gb);
                          run += SHOW_UBITS(re, &s->gb, val);
                          LAST_SKIP_BITS(re, &s->gb, val);
                      }
                      *EOBRUN = run - 1;
                      break;
                  }
              }
          }
  
          if (i > *last_nnz)
              *last_nnz = i;
      }
  
      for (; i <= last; i++) {
          j = s->scantable.permutated[i];
          if (block[j])
              REFINE_BIT(j)
      }
      CLOSE_READER(re, &s->gb);
  
      return 0;
  }
  #undef REFINE_BIT
  #undef ZERO_RUN
  
  static int handle_rstn(MJpegDecodeContext *s, int nb_components)
  {
      int i;
      int reset = 0;
  
      if (s->restart_interval) {
          s->restart_count--;
          if(s->restart_count == 0 && s->avctx->codec_id == AV_CODEC_ID_THP){
              align_get_bits(&s->gb);
              for (i = 0; i < nb_components; i++) /* reset dc */
                  s->last_dc[i] = (4 << s->bits);
          }
  
          i = 8 + ((-get_bits_count(&s->gb)) & 7);
          /* skip RSTn */
          if (s->restart_count == 0) {
              if(   show_bits(&s->gb, i) == (1 << i) - 1
                 || show_bits(&s->gb, i) == 0xFF) {
                  int pos = get_bits_count(&s->gb);
                  align_get_bits(&s->gb);
                  while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
                      skip_bits(&s->gb, 8);
                  if (get_bits_left(&s->gb) >= 8 && (get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
                      for (i = 0; i < nb_components; i++) /* reset dc */
                          s->last_dc[i] = (4 << s->bits);
                      reset = 1;
                  } else
                      skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
              }
          }
      }
      return reset;
  }
  
  static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int predictor, int point_transform)
  {
      int i, mb_x, mb_y;
      uint16_t (*buffer)[4];
      int left[4], top[4], topleft[4];
      const int linesize = s->linesize[0];
      const int mask     = ((1 << s->bits) - 1) << point_transform;
      int resync_mb_y = 0;
      int resync_mb_x = 0;
  
      if (s->nb_components != 3 && s->nb_components != 4)
          return AVERROR_INVALIDDATA;
      if (s->v_max != 1 || s->h_max != 1 || !s->lossless)
          return AVERROR_INVALIDDATA;
  
  
      s->restart_count = s->restart_interval;
  
      av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,
                     (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
      if (!s->ljpeg_buffer)
          return AVERROR(ENOMEM);
  
      buffer = s->ljpeg_buffer;
  
      for (i = 0; i < 4; i++)
          buffer[0][i] = 1 << (s->bits - 1);
  
      for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
          uint8_t *ptr = s->picture_ptr->data[0] + (linesize * mb_y);
  
          if (s->interlaced && s->bottom_field)
              ptr += linesize >> 1;
  
          for (i = 0; i < 4; i++)
              top[i] = left[i] = topleft[i] = buffer[0][i];
  
          for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
              int modified_predictor = predictor;
  
              if (get_bits_left(&s->gb) < 1) {
                  av_log(s->avctx, AV_LOG_ERROR, "bitstream end in rgb_scan\n");
                  return AVERROR_INVALIDDATA;
              }
  
              if (s->restart_interval && !s->restart_count){
                  s->restart_count = s->restart_interval;
                  resync_mb_x = mb_x;
                  resync_mb_y = mb_y;
                  for(i=0; i<4; i++)
                      top[i] = left[i]= topleft[i]= 1 << (s->bits - 1);
              }
              if (mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || !mb_x)
                  modified_predictor = 1;
  
              for (i=0;i<nb_components;i++) {
                  int pred, dc;
  
                  topleft[i] = top[i];
                  top[i]     = buffer[mb_x][i];
  
                  PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
  
                  dc = mjpeg_decode_dc(s, s->dc_index[i]);
                  if(dc == 0xFFFFF)
                      return -1;
  
                  left[i] = buffer[mb_x][i] =
                      mask & (pred + (unsigned)(dc * (1 << point_transform)));
              }
  
              if (s->restart_interval && !--s->restart_count) {
                  align_get_bits(&s->gb);
                  skip_bits(&s->gb, 16); /* skip RSTn */
              }
          }
          if (s->rct && s->nb_components == 4) {
              for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
                  ptr[4*mb_x + 2] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
                  ptr[4*mb_x + 1] = buffer[mb_x][1] + ptr[4*mb_x + 2];
                  ptr[4*mb_x + 3] = buffer[mb_x][2] + ptr[4*mb_x + 2];
                  ptr[4*mb_x + 0] = buffer[mb_x][3];
              }
          } else if (s->nb_components == 4) {
              for(i=0; i<nb_components; i++) {
                  int c= s->comp_index[i];
                  if (s->bits <= 8) {
                      for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
                          ptr[4*mb_x+3-c] = buffer[mb_x][i];
                      }
                  } else if(s->bits == 9) {
                      return AVERROR_PATCHWELCOME;
                  } else {
                      for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
                          ((uint16_t*)ptr)[4*mb_x+c] = buffer[mb_x][i];
                      }
                  }
              }
          } else if (s->rct) {
              for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
                  ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
                  ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
                  ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
              }
          } else if (s->pegasus_rct) {
              for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
                  ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
                  ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
                  ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
              }
          } else {
              for(i=0; i<nb_components; i++) {
                  int c= s->comp_index[i];
                  if (s->bits <= 8) {
                      for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
                          ptr[3*mb_x+2-c] = buffer[mb_x][i];
                      }
                  } else if(s->bits == 9) {
                      return AVERROR_PATCHWELCOME;
                  } else {
                      for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
                          ((uint16_t*)ptr)[3*mb_x+2-c] = buffer[mb_x][i];
                      }
                  }
              }
          }
      }
      return 0;
  }
  
  static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
                                   int point_transform, int nb_components)
  {
      int i, mb_x, mb_y, mask;
      int bits= (s->bits+7)&~7;
      int resync_mb_y = 0;
      int resync_mb_x = 0;
  
      point_transform += bits - s->bits;
      mask = ((1 << s->bits) - 1) << point_transform;
  
      av_assert0(nb_components>=1 && nb_components<=4);
  
      for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
          for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
              if (get_bits_left(&s->gb) < 1) {
                  av_log(s->avctx, AV_LOG_ERROR, "bitstream end in yuv_scan\n");
                  return AVERROR_INVALIDDATA;
              }
              if (s->restart_interval && !s->restart_count){
                  s->restart_count = s->restart_interval;
                  resync_mb_x = mb_x;
                  resync_mb_y = mb_y;
              }
  
              if(!mb_x || mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || s->interlaced){
                  int toprow  = mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x;
                  int leftcol = !mb_x || mb_y == resync_mb_y && mb_x == resync_mb_x;
                  for (i = 0; i < nb_components; i++) {
                      uint8_t *ptr;
                      uint16_t *ptr16;
                      int n, h, v, x, y, c, j, linesize;
                      n = s->nb_blocks[i];
                      c = s->comp_index[i];
                      h = s->h_scount[i];
                      v = s->v_scount[i];
                      x = 0;
                      y = 0;
                      linesize= s->linesize[c];
  
                      if(bits>8) linesize /= 2;
  
                      for(j=0; j<n; j++) {
                          int pred, dc;
  
                          dc = mjpeg_decode_dc(s, s->dc_index[i]);
                          if(dc == 0xFFFFF)
                              return -1;
                          if (   h * mb_x + x >= s->width
                              || v * mb_y + y >= s->height) {
                              // Nothing to do
                          } else if (bits<=8) {
                              ptr = s->picture_ptr->data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
                              if(y==0 && toprow){
                                  if(x==0 && leftcol){
                                      pred= 1 << (bits - 1);
                                  }else{
                                      pred= ptr[-1];
                                  }
                              }else{
                                  if(x==0 && leftcol){
                                      pred= ptr[-linesize];
                                  }else{
                                      PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
                                  }
                              }
  
                              if (s->interlaced && s->bottom_field)
                                  ptr += linesize >> 1;
                              pred &= mask;
                              *ptr= pred + ((unsigned)dc << point_transform);
                          }else{
                              ptr16 = (uint16_t*)(s->picture_ptr->data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
                              if(y==0 && toprow){
                                  if(x==0 && leftcol){
                                      pred= 1 << (bits - 1);
                                  }else{
                                      pred= ptr16[-1];
                                  }
                              }else{
                                  if(x==0 && leftcol){
                                      pred= ptr16[-linesize];
                                  }else{
                                      PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
                                  }
                              }
  
                              if (s->interlaced && s->bottom_field)
                                  ptr16 += linesize >> 1;
                              pred &= mask;
                              *ptr16= pred + ((unsigned)dc << point_transform);
                          }
                          if (++x == h) {
                              x = 0;
                              y++;
                          }
                      }
                  }
              } else {
                  for (i = 0; i < nb_components; i++) {
                      uint8_t *ptr;
                      uint16_t *ptr16;
                      int n, h, v, x, y, c, j, linesize, dc;
                      n        = s->nb_blocks[i];
                      c        = s->comp_index[i];
                      h        = s->h_scount[i];
                      v        = s->v_scount[i];
                      x        = 0;
                      y        = 0;
                      linesize = s->linesize[c];
  
                      if(bits>8) linesize /= 2;
  
                      for (j = 0; j < n; j++) {
                          int pred;
  
                          dc = mjpeg_decode_dc(s, s->dc_index[i]);
                          if(dc == 0xFFFFF)
                              return -1;
                          if (   h * mb_x + x >= s->width
                              || v * mb_y + y >= s->height) {
                              // Nothing to do
                          } else if (bits<=8) {
                              ptr = s->picture_ptr->data[c] +
                                (linesize * (v * mb_y + y)) +
                                (h * mb_x + x); //FIXME optimize this crap
                              PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
  
                              pred &= mask;
                              *ptr = pred + ((unsigned)dc << point_transform);
                          }else{
                              ptr16 = (uint16_t*)(s->picture_ptr->data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
                              PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
  
                              pred &= mask;
                              *ptr16= pred + ((unsigned)dc << point_transform);
                          }
  
                          if (++x == h) {
                              x = 0;
                              y++;
                          }
                      }
                  }
              }
              if (s->restart_interval && !--s->restart_count) {
                  align_get_bits(&s->gb);
                  skip_bits(&s->gb, 16); /* skip RSTn */
              }
          }
      }
      return 0;
  }
  
  static av_always_inline void mjpeg_copy_block(MJpegDecodeContext *s,
                                                uint8_t *dst, const uint8_t *src,
                                                int linesize, int lowres)
  {
      switch (lowres) {
      case 0: s->hdsp.put_pixels_tab[1][0](dst, src, linesize, 8);
          break;
      case 1: copy_block4(dst, src, linesize, linesize, 4);
          break;
      case 2: copy_block2(dst, src, linesize, linesize, 2);
          break;
      case 3: *dst = *src;
          break;
      }
  }
  
  static void shift_output(MJpegDecodeContext *s, uint8_t *ptr, int linesize)
  {
      int block_x, block_y;
      int size = 8 >> s->avctx->lowres;
      if (s->bits > 8) {
          for (block_y=0; block_y<size; block_y++)
              for (block_x=0; block_x<size; block_x++)
                  *(uint16_t*)(ptr + 2*block_x + block_y*linesize) <<= 16 - s->bits;
      } else {
          for (block_y=0; block_y<size; block_y++)
              for (block_x=0; block_x<size; block_x++)
                  *(ptr + block_x + block_y*linesize) <<= 8 - s->bits;
      }
  }
  
  static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
                               int Al, const uint8_t *mb_bitmask,
                               int mb_bitmask_size,
                               const AVFrame *reference)
  {
      int i, mb_x, mb_y, chroma_h_shift, chroma_v_shift, chroma_width, chroma_height;
      uint8_t *data[MAX_COMPONENTS];
      const uint8_t *reference_data[MAX_COMPONENTS];
      int linesize[MAX_COMPONENTS];
      GetBitContext mb_bitmask_gb = {0}; // initialize to silence gcc warning
      int bytes_per_pixel = 1 + (s->bits > 8);
  
      if (mb_bitmask) {
          if (mb_bitmask_size != (s->mb_width * s->mb_height + 7)>>3) {
              av_log(s->avctx, AV_LOG_ERROR, "mb_bitmask_size mismatches\n");
              return AVERROR_INVALIDDATA;
          }
          init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
      }
  
      s->restart_count = 0;
  
      av_pix_fmt_get_chroma_sub_sample(s->avctx->pix_fmt, &chroma_h_shift,
                                       &chroma_v_shift);
      chroma_width  = AV_CEIL_RSHIFT(s->width,  chroma_h_shift);
      chroma_height = AV_CEIL_RSHIFT(s->height, chroma_v_shift);
  
      for (i = 0; i < nb_components; i++) {
          int c   = s->comp_index[i];
          data[c] = s->picture_ptr->data[c];
          reference_data[c] = reference ? reference->data[c] : NULL;
          linesize[c] = s->linesize[c];
          s->coefs_finished[c] |= 1;
      }
  
      for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
          for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
              const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
  
              if (s->restart_interval && !s->restart_count)
                  s->restart_count = s->restart_interval;
  
              if (get_bits_left(&s->gb) < 0) {
                  av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
                         -get_bits_left(&s->gb));
                  return AVERROR_INVALIDDATA;
              }
              for (i = 0; i < nb_components; i++) {
                  uint8_t *ptr;
                  int n, h, v, x, y, c, j;
                  int block_offset;
                  n = s->nb_blocks[i];
                  c = s->comp_index[i];
                  h = s->h_scount[i];
                  v = s->v_scount[i];
                  x = 0;
                  y = 0;
                  for (j = 0; j < n; j++) {
                      block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
                                       (h * mb_x + x) * 8 * bytes_per_pixel) >> s->avctx->lowres);
  
                      if (s->interlaced && s->bottom_field)
                          block_offset += linesize[c] >> 1;
                      if (   8*(h * mb_x + x) < ((c == 1) || (c == 2) ? chroma_width  : s->width)
                          && 8*(v * mb_y + y) < ((c == 1) || (c == 2) ? chroma_height : s->height)) {
                          ptr = data[c] + block_offset;
                      } else
                          ptr = NULL;
                      if (!s->progressive) {
                          if (copy_mb) {
                              if (ptr)
                                  mjpeg_copy_block(s, ptr, reference_data[c] + block_offset,
                                                  linesize[c], s->avctx->lowres);
  
                          } else {
                              s->bdsp.clear_block(s->block);
                              if (decode_block(s, s->block, i,
                                               s->dc_index[i], s->ac_index[i],
                                               s->quant_matrixes[s->quant_sindex[i]]) < 0) {
                                  av_log(s->avctx, AV_LOG_ERROR,
                                         "error y=%d x=%d\n", mb_y, mb_x);
                                  return AVERROR_INVALIDDATA;
                              }
                              if (ptr) {
                                  s->idsp.idct_put(ptr, linesize[c], s->block);
                                  if (s->bits & 7)
                                      shift_output(s, ptr, linesize[c]);
                              }
                          }
                      } else {
                          int block_idx  = s->block_stride[c] * (v * mb_y + y) +
                                           (h * mb_x + x);
                          int16_t *block = s->blocks[c][block_idx];
                          if (Ah)
                              block[0] += get_bits1(&s->gb) *
                                          s->quant_matrixes[s->quant_sindex[i]][0] << Al;
                          else if (decode_dc_progressive(s, block, i, s->dc_index[i],
                                                         s->quant_matrixes[s->quant_sindex[i]],
                                                         Al) < 0) {
                              av_log(s->avctx, AV_LOG_ERROR,
                                     "error y=%d x=%d\n", mb_y, mb_x);
                              return AVERROR_INVALIDDATA;
                          }
                      }
                      ff_dlog(s->avctx, "mb: %d %d processed\n", mb_y, mb_x);
                      ff_dlog(s->avctx, "%d %d %d %d %d %d %d %d \n",
                              mb_x, mb_y, x, y, c, s->bottom_field,
                              (v * mb_y + y) * 8, (h * mb_x + x) * 8);
                      if (++x == h) {
                          x = 0;
                          y++;
                      }
                  }
              }
  
              handle_rstn(s, nb_components);
          }
      }
      return 0;
  }
  
  static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
                                              int se, int Ah, int Al)
  {
      int mb_x, mb_y;
      int EOBRUN = 0;
      int c = s->comp_index[0];
      uint16_t *quant_matrix = s->quant_matrixes[s->quant_sindex[0]];
  
      av_assert0(ss>=0 && Ah>=0 && Al>=0);
      if (se < ss || se > 63) {
          av_log(s->avctx, AV_LOG_ERROR, "SS/SE %d/%d is invalid\n", ss, se);
          return AVERROR_INVALIDDATA;
      }
  
      // s->coefs_finished is a bitmask for coefficients coded
      // ss and se are parameters telling start and end coefficients
      s->coefs_finished[c] |= (2ULL << se) - (1ULL << ss);
  
      s->restart_count = 0;
  
      for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
          int block_idx    = mb_y * s->block_stride[c];
          int16_t (*block)[64] = &s->blocks[c][block_idx];
          uint8_t *last_nnz    = &s->last_nnz[c][block_idx];
          if (get_bits_left(&s->gb) <= 0) {
              av_log(s->avctx, AV_LOG_ERROR, "bitstream truncated in mjpeg_decode_scan_progressive_ac\n");
              return AVERROR_INVALIDDATA;
          }
          for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
                  int ret;
                  if (s->restart_interval && !s->restart_count)
                      s->restart_count = s->restart_interval;
  
                  if (Ah)
                      ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
                                                    quant_matrix, ss, se, Al, &EOBRUN);
                  else
                      ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
                                                     quant_matrix, ss, se, Al, &EOBRUN);
                  if (ret < 0) {
                      av_log(s->avctx, AV_LOG_ERROR,
                             "error y=%d x=%d\n", mb_y, mb_x);
                      return AVERROR_INVALIDDATA;
                  }
  
              if (handle_rstn(s, 0))
                  EOBRUN = 0;
          }
      }
      return 0;
  }
  
  static void mjpeg_idct_scan_progressive_ac(MJpegDecodeContext *s)
  {
      int mb_x, mb_y;
      int c;
      const int bytes_per_pixel = 1 + (s->bits > 8);
      const int block_size = s->lossless ? 1 : 8;
  
      for (c = 0; c < s->nb_components; c++) {
          uint8_t *data = s->picture_ptr->data[c];
          int linesize  = s->linesize[c];
          int h = s->h_max / s->h_count[c];
          int v = s->v_max / s->v_count[c];
          int mb_width     = (s->width  + h * block_size - 1) / (h * block_size);
          int mb_height    = (s->height + v * block_size - 1) / (v * block_size);
  
          if (~s->coefs_finished[c])
              av_log(s->avctx, AV_LOG_WARNING, "component %d is incomplete\n", c);
  
          if (s->interlaced && s->bottom_field)
              data += linesize >> 1;
  
          for (mb_y = 0; mb_y < mb_height; mb_y++) {
              uint8_t *ptr     = data + (mb_y * linesize * 8 >> s->avctx->lowres);
              int block_idx    = mb_y * s->block_stride[c];
              int16_t (*block)[64] = &s->blocks[c][block_idx];
              for (mb_x = 0; mb_x < mb_width; mb_x++, block++) {
                  s->idsp.idct_put(ptr, linesize, *block);
                  if (s->bits & 7)
                      shift_output(s, ptr, linesize);
                  ptr += bytes_per_pixel*8 >> s->avctx->lowres;
              }
          }
      }
  }
  
  int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
                          int mb_bitmask_size, const AVFrame *reference)
  {
      int len, nb_components, i, h, v, predictor, point_transform;
      int index, id, ret;
      const int block_size = s->lossless ? 1 : 8;
      int ilv, prev_shift;
  
      if (!s->got_picture) {
          av_log(s->avctx, AV_LOG_WARNING,
                  "Can not process SOS before SOF, skipping\n");
          return -1;
      }
  
      if (reference) {
          if (reference->width  != s->picture_ptr->width  ||
              reference->height != s->picture_ptr->height ||
              reference->format != s->picture_ptr->format) {
              av_log(s->avctx, AV_LOG_ERROR, "Reference mismatching\n");
              return AVERROR_INVALIDDATA;
          }
      }
  
      av_assert0(s->picture_ptr->data[0]);
      /* XXX: verify len field validity */
      len = get_bits(&s->gb, 16);
      nb_components = get_bits(&s->gb, 8);
      if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
          avpriv_report_missing_feature(s->avctx,
                                        "decode_sos: nb_components (%d)",
                                        nb_components);
          return AVERROR_PATCHWELCOME;
      }
      if (len != 6 + 2 * nb_components) {
          av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
          return AVERROR_INVALIDDATA;
      }
      for (i = 0; i < nb_components; i++) {
          id = get_bits(&s->gb, 8) - 1;
          av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
          /* find component index */
          for (index = 0; index < s->nb_components; index++)
              if (id == s->component_id[index])
                  break;
          if (index == s->nb_components) {
              av_log(s->avctx, AV_LOG_ERROR,
                     "decode_sos: index(%d) out of components\n", index);
              return AVERROR_INVALIDDATA;
          }
          /* Metasoft MJPEG codec has Cb and Cr swapped */
          if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
              && nb_components == 3 && s->nb_components == 3 && i)
              index = 3 - i;
  
          s->quant_sindex[i] = s->quant_index[index];
          s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
          s->h_scount[i]  = s->h_count[index];
          s->v_scount[i]  = s->v_count[index];
  
          if(nb_components == 3 && s->nb_components == 3 && s->avctx->pix_fmt == AV_PIX_FMT_GBR24P)
              index = (i+2)%3;
          if(nb_components == 1 && s->nb_components == 3 && s->avctx->pix_fmt == AV_PIX_FMT_GBR24P)
              index = (index+2)%3;
  
          s->comp_index[i] = index;
  
          s->dc_index[i] = get_bits(&s->gb, 4);
          s->ac_index[i] = get_bits(&s->gb, 4);
  
          if (s->dc_index[i] <  0 || s->ac_index[i] < 0 ||
              s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
              goto out_of_range;
          if (!s->vlcs[0][s->dc_index[i]].table || !(s->progressive ? s->vlcs[2][s->ac_index[0]].table : s->vlcs[1][s->ac_index[i]].table))
              goto out_of_range;
      }
  
      predictor = get_bits(&s->gb, 8);       /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
      ilv = get_bits(&s->gb, 8);             /* JPEG Se / JPEG-LS ILV */
      if(s->avctx->codec_tag != AV_RL32("CJPG")){
          prev_shift      = get_bits(&s->gb, 4); /* Ah */
          point_transform = get_bits(&s->gb, 4); /* Al */
      }else
          prev_shift = point_transform = 0;
  
      if (nb_components > 1) {
          /* interleaved stream */
          s->mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);
          s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
      } else if (!s->ls) { /* skip this for JPEG-LS */
          h = s->h_max / s->h_scount[0];
          v = s->v_max / s->v_scount[0];
          s->mb_width     = (s->width  + h * block_size - 1) / (h * block_size);
          s->mb_height    = (s->height + v * block_size - 1) / (v * block_size);
          s->nb_blocks[0] = 1;
          s->h_scount[0]  = 1;
          s->v_scount[0]  = 1;
      }
  
      if (s->avctx->debug & FF_DEBUG_PICT_INFO)
          av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d skip:%d %s comp:%d\n",
                 s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
                 predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
                 s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""), nb_components);
  
  
      /* mjpeg-b can have padding bytes between sos and image data, skip them */
      for (i = s->mjpb_skiptosod; i > 0; i--)
          skip_bits(&s->gb, 8);
  
  next_field:
      for (i = 0; i < nb_components; i++)
          s->last_dc[i] = (4 << s->bits);
  
      if (s->lossless) {
          av_assert0(s->picture_ptr == s->picture);
          if (CONFIG_JPEGLS_DECODER && s->ls) {
  //            for () {
  //            reset_ls_coding_parameters(s, 0);
  
              if ((ret = ff_jpegls_decode_picture(s, predictor,
                                                  point_transform, ilv)) < 0)
                  return ret;
          } else {
              if (s->rgb) {
                  if ((ret = ljpeg_decode_rgb_scan(s, nb_components, predictor, point_transform)) < 0)
                      return ret;
              } else {
                  if ((ret = ljpeg_decode_yuv_scan(s, predictor,
                                                   point_transform,
                                                   nb_components)) < 0)
                      return ret;
              }
          }
      } else {
          if (s->progressive && predictor) {
              av_assert0(s->picture_ptr == s->picture);
              if ((ret = mjpeg_decode_scan_progressive_ac(s, predictor,
                                                          ilv, prev_shift,
                                                          point_transform)) < 0)
                  return ret;
          } else {
              if ((ret = mjpeg_decode_scan(s, nb_components,
                                           prev_shift, point_transform,
                                           mb_bitmask, mb_bitmask_size, reference)) < 0)
                  return ret;
          }
      }
  
      if (s->interlaced &&
          get_bits_left(&s->gb) > 32 &&
          show_bits(&s->gb, 8) == 0xFF) {
          GetBitContext bak = s->gb;
          align_get_bits(&bak);
          if (show_bits(&bak, 16) == 0xFFD1) {
              av_log(s->avctx, AV_LOG_DEBUG, "AVRn interlaced picture marker found\n");
              s->gb = bak;
              skip_bits(&s->gb, 16);
              s->bottom_field ^= 1;
  
              goto next_field;
          }
      }
  
      emms_c();
      return 0;
   out_of_range:
      av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
      return AVERROR_INVALIDDATA;
  }
  
  static int mjpeg_decode_dri(MJpegDecodeContext *s)
  {
      if (get_bits(&s->gb, 16) != 4)
          return AVERROR_INVALIDDATA;
      s->restart_interval = get_bits(&s->gb, 16);
      s->restart_count    = 0;
      av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
             s->restart_interval);
  
      return 0;
  }
  
  static int mjpeg_decode_app(MJpegDecodeContext *s)
  {
      int len, id, i;
  
      len = get_bits(&s->gb, 16);
      if (len < 6)
          return AVERROR_INVALIDDATA;
      if (8 * len > get_bits_left(&s->gb))
          return AVERROR_INVALIDDATA;
  
      id   = get_bits_long(&s->gb, 32);
      len -= 6;
  
      if (s->avctx->debug & FF_DEBUG_STARTCODE)
          av_log(s->avctx, AV_LOG_DEBUG, "APPx (%s / %8X) len=%d\n",
                 av_fourcc2str(av_bswap32(id)), id, len);
  
      /* Buggy AVID, it puts EOI only at every 10th frame. */
      /* Also, this fourcc is used by non-avid files too, it holds some
         information, but it's always present in AVID-created files. */
      if (id == AV_RB32("AVI1")) {
          /* structure:
              4bytes      AVI1
              1bytes      polarity
              1bytes      always zero
              4bytes      field_size
              4bytes      field_size_less_padding
          */
              s->buggy_avid = 1;
          i = get_bits(&s->gb, 8); len--;
          av_log(s->avctx, AV_LOG_DEBUG, "polarity %d\n", i);
          goto out;
      }
  
      if (id == AV_RB32("JFIF")) {
          int t_w, t_h, v1, v2;
          if (len < 8)
              goto out;
          skip_bits(&s->gb, 8); /* the trailing zero-byte */
          v1 = get_bits(&s->gb, 8);
          v2 = get_bits(&s->gb, 8);
          skip_bits(&s->gb, 8);
  
          s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
          s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
          if (   s->avctx->sample_aspect_ratio.num <= 0
              || s->avctx->sample_aspect_ratio.den <= 0) {
              s->avctx->sample_aspect_ratio.num = 0;
              s->avctx->sample_aspect_ratio.den = 1;
          }
  
          if (s->avctx->debug & FF_DEBUG_PICT_INFO)
              av_log(s->avctx, AV_LOG_INFO,
                     "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
                     v1, v2,
                     s->avctx->sample_aspect_ratio.num,
                     s->avctx->sample_aspect_ratio.den);
  
          len -= 8;
          if (len >= 2) {
              t_w = get_bits(&s->gb, 8);
              t_h = get_bits(&s->gb, 8);
              if (t_w && t_h) {
                  /* skip thumbnail */
                  if (len -10 - (t_w * t_h * 3) > 0)
                      len -= t_w * t_h * 3;
              }
              len -= 2;
          }
          goto out;
      }
  
      if (   id == AV_RB32("Adob")
          && len >= 7
          && show_bits(&s->gb, 8) == 'e'
          && show_bits_long(&s->gb, 32) != AV_RB32("e_CM")) {
          skip_bits(&s->gb,  8); /* 'e' */
          skip_bits(&s->gb, 16); /* version */
          skip_bits(&s->gb, 16); /* flags0 */
          skip_bits(&s->gb, 16); /* flags1 */
          s->adobe_transform = get_bits(&s->gb,  8);
          if (s->avctx->debug & FF_DEBUG_PICT_INFO)
              av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found, transform=%d\n", s->adobe_transform);
          len -= 7;
          goto out;
      }
  
      if (id == AV_RB32("LJIF")) {
          int rgb = s->rgb;
          int pegasus_rct = s->pegasus_rct;
          if (s->avctx->debug & FF_DEBUG_PICT_INFO)
              av_log(s->avctx, AV_LOG_INFO,
                     "Pegasus lossless jpeg header found\n");
          skip_bits(&s->gb, 16); /* version ? */
          skip_bits(&s->gb, 16); /* unknown always 0? */
          skip_bits(&s->gb, 16); /* unknown always 0? */
          skip_bits(&s->gb, 16); /* unknown always 0? */
          switch (i=get_bits(&s->gb, 8)) {
          case 1:
              rgb         = 1;
              pegasus_rct = 0;
              break;
          case 2:
              rgb         = 1;
              pegasus_rct = 1;
              break;
          default:
              av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace %d\n", i);
          }
  
          len -= 9;
          if (s->got_picture)
              if (rgb != s->rgb || pegasus_rct != s->pegasus_rct) {
                  av_log(s->avctx, AV_LOG_WARNING, "Mismatching LJIF tag\n");
                  goto out;
              }
  
          s->rgb = rgb;
          s->pegasus_rct = pegasus_rct;
  
          goto out;
      }
      if (id == AV_RL32("colr") && len > 0) {
          s->colr = get_bits(&s->gb, 8);
          if (s->avctx->debug & FF_DEBUG_PICT_INFO)
              av_log(s->avctx, AV_LOG_INFO, "COLR %d\n", s->colr);
          len --;
          goto out;
      }
      if (id == AV_RL32("xfrm") && len > 0) {
          s->xfrm = get_bits(&s->gb, 8);
          if (s->avctx->debug & FF_DEBUG_PICT_INFO)
              av_log(s->avctx, AV_LOG_INFO, "XFRM %d\n", s->xfrm);
          len --;
          goto out;
      }
  
      /* JPS extension by VRex */
      if (s->start_code == APP3 && id == AV_RB32("_JPS") && len >= 10) {
          int flags, layout, type;
          if (s->avctx->debug & FF_DEBUG_PICT_INFO)
              av_log(s->avctx, AV_LOG_INFO, "_JPSJPS_\n");
  
          skip_bits(&s->gb, 32); len -= 4;  /* JPS_ */
          skip_bits(&s->gb, 16); len -= 2;  /* block length */
          skip_bits(&s->gb, 8);             /* reserved */
          flags  = get_bits(&s->gb, 8);
          layout = get_bits(&s->gb, 8);
          type   = get_bits(&s->gb, 8);
          len -= 4;
  
          s->stereo3d = av_stereo3d_alloc();
          if (!s->stereo3d) {
              goto out;
          }
          if (type == 0) {
              s->stereo3d->type = AV_STEREO3D_2D;
          } else if (type == 1) {
              switch (layout) {
              case 0x01:
                  s->stereo3d->type = AV_STEREO3D_LINES;
                  break;
              case 0x02:
                  s->stereo3d->type = AV_STEREO3D_SIDEBYSIDE;
                  break;
              case 0x03:
                  s->stereo3d->type = AV_STEREO3D_TOPBOTTOM;
                  break;
              }
              if (!(flags & 0x04)) {
                  s->stereo3d->flags = AV_STEREO3D_FLAG_INVERT;
              }
          }
          goto out;
      }
  
      /* EXIF metadata */
      if (s->start_code == APP1 && id == AV_RB32("Exif") && len >= 2) {
          GetByteContext gbytes;
          int ret, le, ifd_offset, bytes_read;
          const uint8_t *aligned;
  
          skip_bits(&s->gb, 16); // skip padding
          len -= 2;
  
          // init byte wise reading
          aligned = align_get_bits(&s->gb);
          bytestream2_init(&gbytes, aligned, len);
  
          // read TIFF header
          ret = ff_tdecode_header(&gbytes, &le, &ifd_offset);
          if (ret) {
              av_log(s->avctx, AV_LOG_ERROR, "mjpeg: invalid TIFF header in EXIF data\n");
          } else {
              bytestream2_seek(&gbytes, ifd_offset, SEEK_SET);
  
              // read 0th IFD and store the metadata
              // (return values > 0 indicate the presence of subimage metadata)
              ret = avpriv_exif_decode_ifd(s->avctx, &gbytes, le, 0, &s->exif_metadata);
              if (ret < 0) {
                  av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error decoding EXIF data\n");
              }
          }
  
          bytes_read = bytestream2_tell(&gbytes);
          skip_bits(&s->gb, bytes_read << 3);
          len -= bytes_read;
  
          goto out;
      }
  
      /* Apple MJPEG-A */
      if ((s->start_code == APP1) && (len > (0x28 - 8))) {
          id   = get_bits_long(&s->gb, 32);
          len -= 4;
          /* Apple MJPEG-A */
          if (id == AV_RB32("mjpg")) {
              /* structure:
                  4bytes      field size
                  4bytes      pad field size
                  4bytes      next off
                  4bytes      quant off
                  4bytes      huff off
                  4bytes      image off
                  4bytes      scan off
                  4bytes      data off
              */
              if (s->avctx->debug & FF_DEBUG_PICT_INFO)
                  av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
          }
      }
  
      if (s->start_code == APP2 && id == AV_RB32("ICC_") && len >= 10) {
          int id2;
          unsigned seqno;
          unsigned nummarkers;
  
          id   = get_bits_long(&s->gb, 32);
          id2  = get_bits_long(&s->gb, 24);
          len -= 7;
          if (id != AV_RB32("PROF") || id2 != AV_RB24("ILE")) {
              av_log(s->avctx, AV_LOG_WARNING, "Invalid ICC_PROFILE header in APP2\n");
              goto out;
          }
  
          skip_bits(&s->gb, 8);
          seqno  = get_bits(&s->gb, 8);
          len   -= 2;
          if (seqno == 0) {
              av_log(s->avctx, AV_LOG_WARNING, "Invalid sequence number in APP2\n");
              goto out;
          }
  
          nummarkers  = get_bits(&s->gb, 8);
          len        -= 1;
          if (nummarkers == 0) {
              av_log(s->avctx, AV_LOG_WARNING, "Invalid number of markers coded in APP2\n");
              goto out;
          } else if (s->iccnum != 0 && nummarkers != s->iccnum) {
              av_log(s->avctx, AV_LOG_WARNING, "Mistmatch in coded number of ICC markers between markers\n");
              goto out;
          } else if (seqno > nummarkers) {
              av_log(s->avctx, AV_LOG_WARNING, "Mismatching sequence number and coded number of ICC markers\n");
              goto out;
          }
  
          /* Allocate if this is the first APP2 we've seen. */
          if (s->iccnum == 0) {
              s->iccdata     = av_mallocz(nummarkers * sizeof(*(s->iccdata)));
              s->iccdatalens = av_mallocz(nummarkers * sizeof(*(s->iccdatalens)));
              if (!s->iccdata || !s->iccdatalens) {
                  av_log(s->avctx, AV_LOG_ERROR, "Could not allocate ICC data arrays\n");
                  return AVERROR(ENOMEM);
              }
              s->iccnum = nummarkers;
          }
  
          if (s->iccdata[seqno - 1]) {
              av_log(s->avctx, AV_LOG_WARNING, "Duplicate ICC sequence number\n");
              goto out;
          }
  
          s->iccdatalens[seqno - 1]  = len;
          s->iccdata[seqno - 1]      = av_malloc(len);
          if (!s->iccdata[seqno - 1]) {
              av_log(s->avctx, AV_LOG_ERROR, "Could not allocate ICC data buffer\n");
              return AVERROR(ENOMEM);
          }
  
          memcpy(s->iccdata[seqno - 1], align_get_bits(&s->gb), len);
          skip_bits(&s->gb, len << 3);
          len = 0;
          s->iccread++;
  
          if (s->iccread > s->iccnum)
              av_log(s->avctx, AV_LOG_WARNING, "Read more ICC markers than are supposed to be coded\n");
      }
  
  out:
      /* slow but needed for extreme adobe jpegs */
      if (len < 0)
          av_log(s->avctx, AV_LOG_ERROR,
                 "mjpeg: error, decode_app parser read over the end\n");
      while (--len > 0)
          skip_bits(&s->gb, 8);
  
      return 0;
  }
  
  static int mjpeg_decode_com(MJpegDecodeContext *s)
  {
      int len = get_bits(&s->gb, 16);
      if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
          int i;
          char *cbuf = av_malloc(len - 1);
          if (!cbuf)
              return AVERROR(ENOMEM);
  
          for (i = 0; i < len - 2; i++)
              cbuf[i] = get_bits(&s->gb, 8);
          if (i > 0 && cbuf[i - 1] == '\n')
              cbuf[i - 1] = 0;
          else
              cbuf[i] = 0;
  
          if (s->avctx->debug & FF_DEBUG_PICT_INFO)
              av_log(s->avctx, AV_LOG_INFO, "comment: '%s'\n", cbuf);
  
          /* buggy avid, it puts EOI only at every 10th frame */
          if (!strncmp(cbuf, "AVID", 4)) {
              parse_avid(s, cbuf, len);
          } else if (!strcmp(cbuf, "CS=ITU601"))
              s->cs_itu601 = 1;
          else if ((!strncmp(cbuf, "Intel(R) JPEG Library, version 1", 32) && s->avctx->codec_tag) ||
                   (!strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
              s->flipped = 1;
          else if (!strcmp(cbuf, "MULTISCOPE II")) {
              s->avctx->sample_aspect_ratio = (AVRational) { 1, 2 };
              s->multiscope = 2;
          }
  
          av_free(cbuf);
      }
  
      return 0;
  }
  
  /* return the 8 bit start code value and update the search
     state. Return -1 if no start code found */
  static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
  {
      const uint8_t *buf_ptr;
      unsigned int v, v2;
      int val;
      int skipped = 0;
  
      buf_ptr = *pbuf_ptr;
      while (buf_end - buf_ptr > 1) {
          v  = *buf_ptr++;
          v2 = *buf_ptr;
          if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
              val = *buf_ptr++;
              goto found;
          }
          skipped++;
      }
      buf_ptr = buf_end;
      val = -1;
  found:
      ff_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
      *pbuf_ptr = buf_ptr;
      return val;
  }
  
  int ff_mjpeg_find_marker(MJpegDecodeContext *s,
                           const uint8_t **buf_ptr, const uint8_t *buf_end,
                           const uint8_t **unescaped_buf_ptr,
                           int *unescaped_buf_size)
  {
      int start_code;
      start_code = find_marker(buf_ptr, buf_end);
  
      av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);
      if (!s->buffer)
          return AVERROR(ENOMEM);
  
      /* unescape buffer of SOS, use special treatment for JPEG-LS */
      if (start_code == SOS && !s->ls) {
          const uint8_t *src = *buf_ptr;
          const uint8_t *ptr = src;
          uint8_t *dst = s->buffer;
  
          #define copy_data_segment(skip) do {       \
              ptrdiff_t length = (ptr - src) - (skip);  \
              if (length > 0) {                         \
                  memcpy(dst, src, length);             \
                  dst += length;                        \
                  src = ptr;                            \
              }                                         \
          } while (0)
  
          if (s->avctx->codec_id == AV_CODEC_ID_THP) {
              ptr = buf_end;
              copy_data_segment(0);
          } else {
              while (ptr < buf_end) {
                  uint8_t x = *(ptr++);
  
                  if (x == 0xff) {
                      ptrdiff_t skip = 0;
                      while (ptr < buf_end && x == 0xff) {
                          x = *(ptr++);
                          skip++;
                      }
  
                      /* 0xFF, 0xFF, ... */
                      if (skip > 1) {
                          copy_data_segment(skip);
  
                          /* decrement src as it is equal to ptr after the
                           * copy_data_segment macro and we might want to
                           * copy the current value of x later on */
                          src--;
                      }
  
                      if (x < 0xd0 || x > 0xd7) {
                          copy_data_segment(1);
                          if (x)
                              break;
                      }
                  }
              }
              if (src < ptr)
                  copy_data_segment(0);
          }
          #undef copy_data_segment
  
          *unescaped_buf_ptr  = s->buffer;
          *unescaped_buf_size = dst - s->buffer;
          memset(s->buffer + *unescaped_buf_size, 0,
                 AV_INPUT_BUFFER_PADDING_SIZE);
  
          av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %"PTRDIFF_SPECIFIER" bytes\n",
                 (buf_end - *buf_ptr) - (dst - s->buffer));
      } else if (start_code == SOS && s->ls) {
          const uint8_t *src = *buf_ptr;
          uint8_t *dst  = s->buffer;
          int bit_count = 0;
          int t = 0, b = 0;
          PutBitContext pb;
  
          /* find marker */
          while (src + t < buf_end) {
              uint8_t x = src[t++];
              if (x == 0xff) {
                  while ((src + t < buf_end) && x == 0xff)
                      x = src[t++];
                  if (x & 0x80) {
                      t -= FFMIN(2, t);
                      break;
                  }
              }
          }
          bit_count = t * 8;
          init_put_bits(&pb, dst, t);
  
          /* unescape bitstream */
          while (b < t) {
              uint8_t x = src[b++];
              put_bits(&pb, 8, x);
              if (x == 0xFF && b < t) {
                  x = src[b++];
                  if (x & 0x80) {
                      av_log(s->avctx, AV_LOG_WARNING, "Invalid escape sequence\n");
                      x &= 0x7f;
                  }
                  put_bits(&pb, 7, x);
                  bit_count--;
              }
          }
          flush_put_bits(&pb);
  
          *unescaped_buf_ptr  = dst;
          *unescaped_buf_size = (bit_count + 7) >> 3;
          memset(s->buffer + *unescaped_buf_size, 0,
                 AV_INPUT_BUFFER_PADDING_SIZE);
      } else {
          *unescaped_buf_ptr  = *buf_ptr;
          *unescaped_buf_size = buf_end - *buf_ptr;
      }
  
      return start_code;
  }
  
  static void reset_icc_profile(MJpegDecodeContext *s)
  {
      int i;
  
      if (s->iccdata)
          for (i = 0; i < s->iccnum; i++)
              av_freep(&s->iccdata[i]);
      av_freep(&s->iccdata);
      av_freep(&s->iccdatalens);
  
      s->iccread = 0;
      s->iccnum  = 0;
  }
  
  int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                            AVPacket *avpkt)
  {
      AVFrame     *frame = data;
      const uint8_t *buf = avpkt->data;
      int buf_size       = avpkt->size;
      MJpegDecodeContext *s = avctx->priv_data;
      const uint8_t *buf_end, *buf_ptr;
      const uint8_t *unescaped_buf_ptr;
      int hshift, vshift;
      int unescaped_buf_size;
      int start_code;
      int i, index;
      int ret = 0;
      int is16bit;
  
      s->buf_size = buf_size;
  
      av_dict_free(&s->exif_metadata);
      av_freep(&s->stereo3d);
      s->adobe_transform = -1;
  
      if (s->iccnum != 0)
          reset_icc_profile(s);
  
      buf_ptr = buf;
      buf_end = buf + buf_size;
      while (buf_ptr < buf_end) {
          /* find start next marker */
          start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
                                            &unescaped_buf_ptr,
                                            &unescaped_buf_size);
          /* EOF */
          if (start_code < 0) {
              break;
          } else if (unescaped_buf_size > INT_MAX / 8) {
              av_log(avctx, AV_LOG_ERROR,
                     "MJPEG packet 0x%x too big (%d/%d), corrupt data?\n",
                     start_code, unescaped_buf_size, buf_size);
              return AVERROR_INVALIDDATA;
          }
          av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%"PTRDIFF_SPECIFIER"\n",
                 start_code, buf_end - buf_ptr);
  
          ret = init_get_bits8(&s->gb, unescaped_buf_ptr, unescaped_buf_size);
  
          if (ret < 0) {
              av_log(avctx, AV_LOG_ERROR, "invalid buffer\n");
              goto fail;
          }
  
          s->start_code = start_code;
          if (s->avctx->debug & FF_DEBUG_STARTCODE)
              av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
  
          /* process markers */
          if (start_code >= 0xd0 && start_code <= 0xd7) {
              av_log(avctx, AV_LOG_DEBUG,
                     "restart marker: %d\n", start_code & 0x0f);
              /* APP fields */
          } else if (start_code >= APP0 && start_code <= APP15) {
              if ((ret = mjpeg_decode_app(s)) < 0)
                  av_log(avctx, AV_LOG_ERROR, "unable to decode APP fields: %s\n",
                         av_err2str(ret));
              /* Comment */
          } else if (start_code == COM) {
              ret = mjpeg_decode_com(s);
              if (ret < 0)
                  return ret;
          } else if (start_code == DQT) {
              ret = ff_mjpeg_decode_dqt(s);
              if (ret < 0)
                  return ret;
          }
  
          ret = -1;
  
          if (!CONFIG_JPEGLS_DECODER &&
              (start_code == SOF48 || start_code == LSE)) {
              av_log(avctx, AV_LOG_ERROR, "JPEG-LS support not enabled.\n");
              return AVERROR(ENOSYS);
          }
  
          if (avctx->skip_frame == AVDISCARD_ALL) {
              switch(start_code) {
              case SOF0:
              case SOF1:
              case SOF2:
              case SOF3:
              case SOF48:
              case SOI:
              case SOS:
              case EOI:
                  break;
              default:
                  goto skip;
              }
          }
  
          switch (start_code) {
          case SOI:
              s->restart_interval = 0;
              s->restart_count    = 0;
              /* nothing to do on SOI */
              break;
          case DHT:
              if ((ret = ff_mjpeg_decode_dht(s)) < 0) {
                  av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
                  goto fail;
              }
              break;
          case SOF0:
          case SOF1:
              s->lossless    = 0;
              s->ls          = 0;
              s->progressive = 0;
              if ((ret = ff_mjpeg_decode_sof(s)) < 0)
                  goto fail;
              break;
          case SOF2:
              s->lossless    = 0;
              s->ls          = 0;
              s->progressive = 1;
              if ((ret = ff_mjpeg_decode_sof(s)) < 0)
                  goto fail;
              break;
          case SOF3:
              s->avctx->properties |= FF_CODEC_PROPERTY_LOSSLESS;
              s->lossless    = 1;
              s->ls          = 0;
              s->progressive = 0;
              if ((ret = ff_mjpeg_decode_sof(s)) < 0)
                  goto fail;
              break;
          case SOF48:
              s->avctx->properties |= FF_CODEC_PROPERTY_LOSSLESS;
              s->lossless    = 1;
              s->ls          = 1;
              s->progressive = 0;
              if ((ret = ff_mjpeg_decode_sof(s)) < 0)
                  goto fail;
              break;
          case LSE:
              if (!CONFIG_JPEGLS_DECODER ||
                  (ret = ff_jpegls_decode_lse(s)) < 0)
                  goto fail;
              break;
          case EOI:
  eoi_parser:
              if (avctx->skip_frame != AVDISCARD_ALL && s->progressive && s->cur_scan && s->got_picture)
                  mjpeg_idct_scan_progressive_ac(s);
              s->cur_scan = 0;
              if (!s->got_picture) {
                  av_log(avctx, AV_LOG_WARNING,
                         "Found EOI before any SOF, ignoring\n");
                  break;
              }
              if (s->interlaced) {
                  s->bottom_field ^= 1;
                  /* if not bottom field, do not output image yet */
                  if (s->bottom_field == !s->interlace_polarity)
                      break;
              }
              if (avctx->skip_frame == AVDISCARD_ALL) {
                  s->got_picture = 0;
                  goto the_end_no_picture;
              }
              if ((ret = av_frame_ref(frame, s->picture_ptr)) < 0)
                  return ret;
              *got_frame = 1;
              s->got_picture = 0;
  
              if (!s->lossless) {
                  int qp = FFMAX3(s->qscale[0],
                                  s->qscale[1],
                                  s->qscale[2]);
                  int qpw = (s->width + 15) / 16;
                  AVBufferRef *qp_table_buf = av_buffer_alloc(qpw);
                  if (qp_table_buf) {
                      memset(qp_table_buf->data, qp, qpw);
                      av_frame_set_qp_table(data, qp_table_buf, 0, FF_QSCALE_TYPE_MPEG1);
                  }
  
                  if(avctx->debug & FF_DEBUG_QP)
                      av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", qp);
              }
  
              goto the_end;
          case SOS:
              s->cur_scan++;
              if (avctx->skip_frame == AVDISCARD_ALL) {
                  skip_bits(&s->gb, get_bits_left(&s->gb));
                  break;
              }
  
              if ((ret = ff_mjpeg_decode_sos(s, NULL, 0, NULL)) < 0 &&
                  (avctx->err_recognition & AV_EF_EXPLODE))
                  goto fail;
              break;
          case DRI:
              if ((ret = mjpeg_decode_dri(s)) < 0)
                  return ret;
              break;
          case SOF5:
          case SOF6:
          case SOF7:
          case SOF9:
          case SOF10:
          case SOF11:
          case SOF13:
          case SOF14:
          case SOF15:
          case JPG:
              av_log(avctx, AV_LOG_ERROR,
                     "mjpeg: unsupported coding type (%x)\n", start_code);
              break;
          }
  
  skip:
          /* eof process start code */
          buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
          av_log(avctx, AV_LOG_DEBUG,
                 "marker parser used %d bytes (%d bits)\n",
                 (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
      }
      if (s->got_picture && s->cur_scan) {
          av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
          goto eoi_parser;
      }
      av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
      return AVERROR_INVALIDDATA;
  fail:
      s->got_picture = 0;
      return ret;
  the_end:
  
      is16bit = av_pix_fmt_desc_get(s->avctx->pix_fmt)->comp[0].step > 1;
  
      if (AV_RB32(s->upscale_h)) {
          int p;
          av_assert0(avctx->pix_fmt == AV_PIX_FMT_YUVJ444P ||
                     avctx->pix_fmt == AV_PIX_FMT_YUV444P  ||
                     avctx->pix_fmt == AV_PIX_FMT_YUVJ440P ||
                     avctx->pix_fmt == AV_PIX_FMT_YUV440P  ||
                     avctx->pix_fmt == AV_PIX_FMT_YUVA444P ||
                     avctx->pix_fmt == AV_PIX_FMT_YUVJ420P ||
                     avctx->pix_fmt == AV_PIX_FMT_YUV420P  ||
                     avctx->pix_fmt == AV_PIX_FMT_YUV420P16||
                     avctx->pix_fmt == AV_PIX_FMT_YUVA420P  ||
                     avctx->pix_fmt == AV_PIX_FMT_YUVA420P16||
                     avctx->pix_fmt == AV_PIX_FMT_GBRP     ||
                     avctx->pix_fmt == AV_PIX_FMT_GBRAP
                    );
          avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
          av_assert0(s->nb_components == av_pix_fmt_count_planes(s->picture_ptr->format));
          for (p = 0; p<s->nb_components; p++) {
              uint8_t *line = s->picture_ptr->data[p];
              int w = s->width;
              int h = s->height;
              if (!s->upscale_h[p])
                  continue;
              if (p==1 || p==2) {
                  w = AV_CEIL_RSHIFT(w, hshift);
                  h = AV_CEIL_RSHIFT(h, vshift);
              }
              if (s->upscale_v[p])
                  h = (h+1)>>1;
              av_assert0(w > 0);
              for (i = 0; i < h; i++) {
                  if (s->upscale_h[p] == 1) {
                      if (is16bit) ((uint16_t*)line)[w - 1] = ((uint16_t*)line)[(w - 1) / 2];
                      else                      line[w - 1] = line[(w - 1) / 2];
                      for (index = w - 2; index > 0; index--) {
                          if (is16bit)
                              ((uint16_t*)line)[index] = (((uint16_t*)line)[index / 2] + ((uint16_t*)line)[(index + 1) / 2]) >> 1;
                          else
                              line[index] = (line[index / 2] + line[(index + 1) / 2]) >> 1;
                      }
                  } else if (s->upscale_h[p] == 2) {
                      if (is16bit) {
                          ((uint16_t*)line)[w - 1] = ((uint16_t*)line)[(w - 1) / 3];
                          if (w > 1)
                              ((uint16_t*)line)[w - 2] = ((uint16_t*)line)[w - 1];
                      } else {
                          line[w - 1] = line[(w - 1) / 3];
                          if (w > 1)
                              line[w - 2] = line[w - 1];
                      }
                      for (index = w - 3; index > 0; index--) {
                          line[index] = (line[index / 3] + line[(index + 1) / 3] + line[(index + 2) / 3] + 1) / 3;
                      }
                  }
                  line += s->linesize[p];
              }
          }
      }
      if (AV_RB32(s->upscale_v)) {
          int p;
          av_assert0(avctx->pix_fmt == AV_PIX_FMT_YUVJ444P ||
                     avctx->pix_fmt == AV_PIX_FMT_YUV444P  ||
                     avctx->pix_fmt == AV_PIX_FMT_YUVJ422P ||
                     avctx->pix_fmt == AV_PIX_FMT_YUV422P  ||
                     avctx->pix_fmt == AV_PIX_FMT_YUVJ420P ||
                     avctx->pix_fmt == AV_PIX_FMT_YUV420P  ||
                     avctx->pix_fmt == AV_PIX_FMT_YUV440P  ||
                     avctx->pix_fmt == AV_PIX_FMT_YUVJ440P ||
                     avctx->pix_fmt == AV_PIX_FMT_YUVA444P ||
                     avctx->pix_fmt == AV_PIX_FMT_YUVA420P  ||
                     avctx->pix_fmt == AV_PIX_FMT_YUVA420P16||
                     avctx->pix_fmt == AV_PIX_FMT_GBRP     ||
                     avctx->pix_fmt == AV_PIX_FMT_GBRAP
                     );
          avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
          av_assert0(s->nb_components == av_pix_fmt_count_planes(s->picture_ptr->format));
          for (p = 0; p < s->nb_components; p++) {
              uint8_t *dst;
              int w = s->width;
              int h = s->height;
              if (!s->upscale_v[p])
                  continue;
              if (p==1 || p==2) {
                  w = AV_CEIL_RSHIFT(w, hshift);
                  h = AV_CEIL_RSHIFT(h, vshift);
              }
              dst = &((uint8_t *)s->picture_ptr->data[p])[(h - 1) * s->linesize[p]];
              for (i = h - 1; i; i--) {
                  uint8_t *src1 = &((uint8_t *)s->picture_ptr->data[p])[i / 2 * s->linesize[p]];
                  uint8_t *src2 = &((uint8_t *)s->picture_ptr->data[p])[(i + 1) / 2 * s->linesize[p]];
                  if (src1 == src2 || i == h - 1) {
                      memcpy(dst, src1, w);
                  } else {
                      for (index = 0; index < w; index++)
                          dst[index] = (src1[index] + src2[index]) >> 1;
                  }
                  dst -= s->linesize[p];
              }
          }
      }
      if (s->flipped && !s->rgb) {
          int j;
          avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
          av_assert0(s->nb_components == av_pix_fmt_count_planes(s->picture_ptr->format));
          for (index=0; index<s->nb_components; index++) {
              uint8_t *dst = s->picture_ptr->data[index];
              int w = s->picture_ptr->width;
              int h = s->picture_ptr->height;
              if(index && index<3){
                  w = AV_CEIL_RSHIFT(w, hshift);
                  h = AV_CEIL_RSHIFT(h, vshift);
              }
              if(dst){
                  uint8_t *dst2 = dst + s->picture_ptr->linesize[index]*(h-1);
                  for (i=0; i<h/2; i++) {
                      for (j=0; j<w; j++)
                          FFSWAP(int, dst[j], dst2[j]);
                      dst  += s->picture_ptr->linesize[index];
                      dst2 -= s->picture_ptr->linesize[index];
                  }
              }
          }
      }
      if (s->adobe_transform == 0 && s->avctx->pix_fmt == AV_PIX_FMT_GBRAP) {
          int w = s->picture_ptr->width;
          int h = s->picture_ptr->height;
          av_assert0(s->nb_components == 4);
          for (i=0; i<h; i++) {
              int j;
              uint8_t *dst[4];
              for (index=0; index<4; index++) {
                  dst[index] =   s->picture_ptr->data[index]
                               + s->picture_ptr->linesize[index]*i;
              }
              for (j=0; j<w; j++) {
                  int k = dst[3][j];
                  int r = dst[0][j] * k;
                  int g = dst[1][j] * k;
                  int b = dst[2][j] * k;
                  dst[0][j] = g*257 >> 16;
                  dst[1][j] = b*257 >> 16;
                  dst[2][j] = r*257 >> 16;
                  dst[3][j] = 255;
              }
          }
      }
      if (s->adobe_transform == 2 && s->avctx->pix_fmt == AV_PIX_FMT_YUVA444P) {
          int w = s->picture_ptr->width;
          int h = s->picture_ptr->height;
          av_assert0(s->nb_components == 4);
          for (i=0; i<h; i++) {
              int j;
              uint8_t *dst[4];
              for (index=0; index<4; index++) {
                  dst[index] =   s->picture_ptr->data[index]
                               + s->picture_ptr->linesize[index]*i;
              }
              for (j=0; j<w; j++) {
                  int k = dst[3][j];
                  int r = (255 - dst[0][j]) * k;
                  int g = (128 - dst[1][j]) * k;
                  int b = (128 - dst[2][j]) * k;
                  dst[0][j] = r*257 >> 16;
                  dst[1][j] = (g*257 >> 16) + 128;
                  dst[2][j] = (b*257 >> 16) + 128;
                  dst[3][j] = 255;
              }
          }
      }
  
      if (s->stereo3d) {
          AVStereo3D *stereo = av_stereo3d_create_side_data(data);
          if (stereo) {
              stereo->type  = s->stereo3d->type;
              stereo->flags = s->stereo3d->flags;
          }
          av_freep(&s->stereo3d);
      }
  
      if (s->iccnum != 0 && s->iccnum == s->iccread) {
          AVFrameSideData *sd;
          size_t offset = 0;
          int total_size = 0;
          int i;
  
          /* Sum size of all parts. */
          for (i = 0; i < s->iccnum; i++)
              total_size += s->iccdatalens[i];
  
          sd = av_frame_new_side_data(data, AV_FRAME_DATA_ICC_PROFILE, total_size);
          if (!sd) {
              av_log(s->avctx, AV_LOG_ERROR, "Could not allocate frame side data\n");
              return AVERROR(ENOMEM);
          }
  
          /* Reassemble the parts, which are now in-order. */
          for (i = 0; i < s->iccnum; i++) {
              memcpy(sd->data + offset, s->iccdata[i], s->iccdatalens[i]);
              offset += s->iccdatalens[i];
          }
      }
  
      av_dict_copy(&((AVFrame *) data)->metadata, s->exif_metadata, 0);
      av_dict_free(&s->exif_metadata);
  
  the_end_no_picture:
      av_log(avctx, AV_LOG_DEBUG, "decode frame unused %"PTRDIFF_SPECIFIER" bytes\n",
             buf_end - buf_ptr);
  //  return buf_end - buf_ptr;
      return buf_ptr - buf;
  }
  
  av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
  {
      MJpegDecodeContext *s = avctx->priv_data;
      int i, j;
  
      if (s->interlaced && s->bottom_field == !s->interlace_polarity && s->got_picture && !avctx->frame_number) {
          av_log(avctx, AV_LOG_INFO, "Single field\n");
      }
  
      if (s->picture) {
          av_frame_free(&s->picture);
          s->picture_ptr = NULL;
      } else if (s->picture_ptr)
          av_frame_unref(s->picture_ptr);
  
      av_freep(&s->buffer);
      av_freep(&s->stereo3d);
      av_freep(&s->ljpeg_buffer);
      s->ljpeg_buffer_size = 0;
  
      for (i = 0; i < 3; i++) {
          for (j = 0; j < 4; j++)
              ff_free_vlc(&s->vlcs[i][j]);
      }
      for (i = 0; i < MAX_COMPONENTS; i++) {
          av_freep(&s->blocks[i]);
          av_freep(&s->last_nnz[i]);
      }
      av_dict_free(&s->exif_metadata);
  
      reset_icc_profile(s);
  
      return 0;
  }
  
  static void decode_flush(AVCodecContext *avctx)
  {
      MJpegDecodeContext *s = avctx->priv_data;
      s->got_picture = 0;
  }
  
  #if CONFIG_MJPEG_DECODER
  #define OFFSET(x) offsetof(MJpegDecodeContext, x)
  #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
  static const AVOption options[] = {
      { "extern_huff", "Use external huffman table.",
        OFFSET(extern_huff), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
      { NULL },
  };
  
  static const AVClass mjpegdec_class = {
      .class_name = "MJPEG decoder",
      .item_name  = av_default_item_name,
      .option     = options,
      .version    = LIBAVUTIL_VERSION_INT,
  };
  
  AVCodec ff_mjpeg_decoder = {
      .name           = "mjpeg",
      .long_name      = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
      .type           = AVMEDIA_TYPE_VIDEO,
      .id             = AV_CODEC_ID_MJPEG,
      .priv_data_size = sizeof(MJpegDecodeContext),
      .init           = ff_mjpeg_decode_init,
      .close          = ff_mjpeg_decode_end,
      .decode         = ff_mjpeg_decode_frame,
      .flush          = decode_flush,
      .capabilities   = AV_CODEC_CAP_DR1,
      .max_lowres     = 3,
      .priv_class     = &mjpegdec_class,
      .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |
                        FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
  };
  #endif
  #if CONFIG_THP_DECODER
  AVCodec ff_thp_decoder = {
      .name           = "thp",
      .long_name      = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
      .type           = AVMEDIA_TYPE_VIDEO,
      .id             = AV_CODEC_ID_THP,
      .priv_data_size = sizeof(MJpegDecodeContext),
      .init           = ff_mjpeg_decode_init,
      .close          = ff_mjpeg_decode_end,
      .decode         = ff_mjpeg_decode_frame,
      .flush          = decode_flush,
      .capabilities   = AV_CODEC_CAP_DR1,
      .max_lowres     = 3,
      .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
  };
  #endif
  