text: /*
   * Copyright (c) 2011 Derek Buitenhuis
   *
   * This file is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public
   * License as published by the Free Software Foundation;
   * version 2 of the License.
   *
   * 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
   * General Public License for more details.
   *
   * You should have received a copy of the GNU 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
   * Known FOURCCs:
   *     'ULY0' (YCbCr 4:2:0), 'ULY2' (YCbCr 4:2:2), 'ULRG' (RGB), 'ULRA' (RGBA),
   *     'ULH0' (YCbCr 4:2:0 BT.709), 'ULH2' (YCbCr 4:2:2 BT.709)
   */
  
  extern "C" {
  #include "avcodec.h"
  }
  
  #include "libutvideo.h"
  #include "get_bits.h"
  
  static av_cold int utvideo_decode_init(AVCodecContext *avctx)
  {
      UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
      UtVideoExtra info;
      int format;
      int begin_ret;
  
      if (avctx->extradata_size != 4*4) {
          av_log(avctx, AV_LOG_ERROR, "Extradata size mismatch.\n");
          return -1;
      }
  
      /* Read extradata */
      info.version = AV_RL32(avctx->extradata);
      info.original_format = AV_RL32(avctx->extradata + 4);
      info.frameinfo_size = AV_RL32(avctx->extradata + 8);
      info.flags = AV_RL32(avctx->extradata + 12);
  
      /* Pick format based on FOURCC */
      switch (avctx->codec_tag) {
  #ifdef UTV_BT709
      case MKTAG('U', 'L', 'H', '0'):
          avctx->pix_fmt = AV_PIX_FMT_YUV420P;
          avctx->colorspace = AVCOL_SPC_BT709;
          format = UTVF_YV12;
          break;
      case MKTAG('U', 'L', 'H', '2'):
          avctx->pix_fmt = AV_PIX_FMT_YUYV422;
          avctx->colorspace = AVCOL_SPC_BT709;
          format = UTVF_YUY2;
          break;
  #endif
      case MKTAG('U', 'L', 'Y', '0'):
          avctx->pix_fmt = AV_PIX_FMT_YUV420P;
          format = UTVF_YV12;
          break;
      case MKTAG('U', 'L', 'Y', '2'):
          avctx->pix_fmt = AV_PIX_FMT_YUYV422;
          format = UTVF_YUY2;
          break;
      case MKTAG('U', 'L', 'R', 'G'):
          avctx->pix_fmt = AV_PIX_FMT_BGR24;
          format = UTVF_NFCC_BGR_BU;
          break;
      case MKTAG('U', 'L', 'R', 'A'):
          avctx->pix_fmt = AV_PIX_FMT_RGB32;
          format = UTVF_NFCC_BGRA_BU;
          break;
      default:
          av_log(avctx, AV_LOG_ERROR,
                "Not a Ut Video FOURCC: %X\n", avctx->codec_tag);
          return -1;
      }
  
      /* Only allocate the buffer once */
      utv->buf_size = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
      utv->buffer = (uint8_t *)av_malloc(utv->buf_size * sizeof(uint8_t));
  
      if (utv->buffer == NULL) {
          av_log(avctx, AV_LOG_ERROR, "Unable to allocate output buffer.\n");
          return -1;
      }
  
      /* Allocate the output frame */
      avctx->coded_frame = avcodec_alloc_frame();
  
      /* Ut Video only supports 8-bit */
      avctx->bits_per_raw_sample = 8;
  
      /* Is it interlaced? */
      avctx->coded_frame->interlaced_frame = info.flags & 0x800 ? 1 : 0;
  
      /* Apparently Ut Video doesn't store this info... */
      avctx->coded_frame->top_field_first = 1;
  
      /*
       * Create a Ut Video instance. Since the function wants
       * an "interface name" string, pass it the name of the lib.
       */
      utv->codec = CCodec::CreateInstance(UNFCC(avctx->codec_tag), "libavcodec");
  
      /* Initialize Decoding */
      begin_ret = utv->codec->DecodeBegin(format, avctx->width, avctx->height,
                              CBGROSSWIDTH_WINDOWS, &info, sizeof(UtVideoExtra));
  
      /* Check to see if the decoder initlized properly */
      if (begin_ret != 0) {
          av_log(avctx, AV_LOG_ERROR,
                 "Could not initialize decoder: %d\n", begin_ret);
          return -1;
      }
  
      return 0;
  }
  
  static int utvideo_decode_frame(AVCodecContext *avctx, void *data,
                                  int *got_frame, AVPacket *avpkt)
  {
      UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
      AVFrame *pic = avctx->coded_frame;
      int w = avctx->width, h = avctx->height;
  
      /* Set flags */
      pic->reference = 0;
      pic->pict_type = AV_PICTURE_TYPE_I;
      pic->key_frame = 1;
  
      /* Decode the frame */
      utv->codec->DecodeFrame(utv->buffer, avpkt->data, true);
  
      /* Set the output data depending on the colorspace */
      switch (avctx->pix_fmt) {
      case AV_PIX_FMT_YUV420P:
          pic->linesize[0] = w;
          pic->linesize[1] = pic->linesize[2] = w / 2;
          pic->data[0] = utv->buffer;
          pic->data[2] = utv->buffer + (w * h);
          pic->data[1] = pic->data[2] + (w * h / 4);
          break;
      case AV_PIX_FMT_YUYV422:
          pic->linesize[0] = w * 2;
          pic->data[0] = utv->buffer;
          break;
      case AV_PIX_FMT_BGR24:
      case AV_PIX_FMT_RGB32:
          /* Make the linesize negative, since Ut Video uses bottom-up BGR */
          pic->linesize[0] = -1 * w * (avctx->pix_fmt == AV_PIX_FMT_BGR24 ? 3 : 4);
          pic->data[0] = utv->buffer + utv->buf_size + pic->linesize[0];
          break;
      }
  
      *got_frame = 1;
      *(AVFrame *)data = *pic;
  
      return avpkt->size;
  }
  
  static av_cold int utvideo_decode_close(AVCodecContext *avctx)
  {
      UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
  
      /* Free output */
      av_freep(&avctx->coded_frame);
      av_freep(&utv->buffer);
  
      /* Finish decoding and clean up the instance */
      utv->codec->DecodeEnd();
      CCodec::DeleteInstance(utv->codec);
  
      return 0;
  }
  
  AVCodec ff_libutvideo_decoder = {
      "libutvideo",
      NULL_IF_CONFIG_SMALL("Ut Video"),
      AVMEDIA_TYPE_VIDEO,
      AV_CODEC_ID_UTVIDEO,
      0,    //capabilities
      NULL, //supported_framerates
      NULL, //pix_fmts
      NULL, //supported_samplerates
      NULL, //sample_fmts
      NULL, //channel_layouts
      0,    //max_lowres
      NULL, //priv_class
      NULL, //profiles
      sizeof(UtVideoContext),
      NULL, //next
      NULL, //init_thread_copy
      NULL, //update_thread_context
      NULL, //defaults
      NULL, //init_static_data
      utvideo_decode_init,
      NULL, //encode
      NULL, //encode2
      utvideo_decode_frame,
      utvideo_decode_close,
  };
  