text: /*
   * AVS encoding using the xavs library
   * Copyright (C) 2010 Amanda, Y.N. Wu <amanda11192003@gmail.com>
   *
   * This file is part of Libav.
   *
   * Libav 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.
   *
   * Libav 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 Libav; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <math.h>
  #include <stdint.h>
  #include <float.h>
  #include <xavs.h>
  #include "avcodec.h"
  #include "internal.h"
  #include "libavutil/internal.h"
  #include "libavutil/mem.h"
  #include "libavutil/opt.h"
  
  #define END_OF_STREAM 0x001
  
  #define XAVS_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
  #define XAVS_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
  #define XAVS_PART_B8X8 0x100 /* Analyze b16x8, b*/
  
  typedef struct XavsContext {
      AVClass        *class;
      xavs_param_t    params;
      xavs_t         *enc;
      xavs_picture_t  pic;
      uint8_t        *sei;
      int             sei_size;
      int             end_of_stream;
      float crf;
      int cqp;
      int b_bias;
      float cplxblur;
      int direct_pred;
      int aud;
      int fast_pskip;
      int motion_est;
      int mbtree;
      int mixed_refs;
      int b_frame_strategy;
      int chroma_offset;
      int scenechange_threshold;
      int noise_reduction;
  
      int64_t *pts_buffer;
      int out_frame_count;
  } XavsContext;
  
  static void XAVS_log(void *p, int level, const char *fmt, va_list args)
  {
      static const int level_map[] = {
          [XAVS_LOG_ERROR]   = AV_LOG_ERROR,
          [XAVS_LOG_WARNING] = AV_LOG_WARNING,
          [XAVS_LOG_INFO]    = AV_LOG_INFO,
          [XAVS_LOG_DEBUG]   = AV_LOG_DEBUG
      };
  
      if (level < 0 || level > XAVS_LOG_DEBUG)
          return;
  
      av_vlog(p, level_map[level], fmt, args);
  }
  
  static int encode_nals(AVCodecContext *ctx, AVPacket *pkt,
                         xavs_nal_t *nals, int nnal)
  {
      XavsContext *x4 = ctx->priv_data;
      uint8_t *p;
      int i, s, ret, size = x4->sei_size + AV_INPUT_BUFFER_MIN_SIZE;
  
      if (!nnal)
          return 0;
  
      for (i = 0; i < nnal; i++)
          size += nals[i].i_payload;
  
      if ((ret = ff_alloc_packet(pkt, size)) < 0) {
          av_log(ctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n", size);
          return ret;
      }
      p = pkt->data;
  
      /* Write the SEI as part of the first frame. */
      if (x4->sei_size > 0 && nnal > 0) {
          memcpy(p, x4->sei, x4->sei_size);
          p += x4->sei_size;
          x4->sei_size = 0;
      }
  
      for (i = 0; i < nnal; i++) {
          s = xavs_nal_encode(p, &size, 1, nals + i);
          if (s < 0)
              return -1;
          p += s;
      }
      pkt->size = p - pkt->data;
  
      return 1;
  }
  
  static int XAVS_frame(AVCodecContext *avctx, AVPacket *pkt,
                        const AVFrame *frame, int *got_packet)
  {
      XavsContext *x4 = avctx->priv_data;
      xavs_nal_t *nal;
      int nnal, i, ret;
      xavs_picture_t pic_out;
      uint8_t *sd;
  
      x4->pic.img.i_csp   = XAVS_CSP_I420;
      x4->pic.img.i_plane = 3;
  
      if (frame) {
         for (i = 0; i < 3; i++) {
              x4->pic.img.plane[i] = frame->data[i];
              x4->pic.img.i_stride[i] = frame->linesize[i];
         }
  
          x4->pic.i_pts  = frame->pts;
          x4->pic.i_type = XAVS_TYPE_AUTO;
          x4->pts_buffer[avctx->frame_number % (avctx->max_b_frames+1)] = frame->pts;
      }
  
      if (xavs_encoder_encode(x4->enc, &nal, &nnal,
                              frame? &x4->pic: NULL, &pic_out) < 0)
      return -1;
  
      ret = encode_nals(avctx, pkt, nal, nnal);
  
      if (ret < 0)
          return -1;
  
      if (!ret) {
          if (!frame && !(x4->end_of_stream)) {
              if ((ret = ff_alloc_packet(pkt, 4)) < 0)
                  return ret;
  
              pkt->data[0] = 0x0;
              pkt->data[1] = 0x0;
              pkt->data[2] = 0x01;
              pkt->data[3] = 0xb1;
              pkt->dts = 2*x4->pts_buffer[(x4->out_frame_count-1)%(avctx->max_b_frames+1)] -
                         x4->pts_buffer[(x4->out_frame_count-2)%(avctx->max_b_frames+1)];
              x4->end_of_stream = END_OF_STREAM;
              *got_packet = 1;
          }
          return 0;
      }
  
  #if FF_API_CODED_FRAME
  FF_DISABLE_DEPRECATION_WARNINGS
      avctx->coded_frame->pts = pic_out.i_pts;
  FF_ENABLE_DEPRECATION_WARNINGS
  #endif
      pkt->pts = pic_out.i_pts;
      if (avctx->has_b_frames) {
          if (!x4->out_frame_count)
              pkt->dts = pkt->pts - (x4->pts_buffer[1] - x4->pts_buffer[0]);
          else
              pkt->dts = x4->pts_buffer[(x4->out_frame_count-1)%(avctx->max_b_frames+1)];
      } else
          pkt->dts = pkt->pts;
  
  #if FF_API_CODED_FRAME
  FF_DISABLE_DEPRECATION_WARNINGS
      switch (pic_out.i_type) {
      case XAVS_TYPE_IDR:
      case XAVS_TYPE_I:
          avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
          break;
      case XAVS_TYPE_P:
          avctx->coded_frame->pict_type = AV_PICTURE_TYPE_P;
          break;
      case XAVS_TYPE_B:
      case XAVS_TYPE_BREF:
          avctx->coded_frame->pict_type = AV_PICTURE_TYPE_B;
          break;
      }
  FF_ENABLE_DEPRECATION_WARNINGS
  #endif
  
      /* There is no IDR frame in AVS JiZhun */
      /* Sequence header is used as a flag */
      if (pic_out.i_type == XAVS_TYPE_I) {
  #if FF_API_CODED_FRAME
  FF_DISABLE_DEPRECATION_WARNINGS
          avctx->coded_frame->key_frame = 1;
  FF_ENABLE_DEPRECATION_WARNINGS
  #endif
          pkt->flags |= AV_PKT_FLAG_KEY;
      }
  
  #if FF_API_CODED_FRAME
  FF_DISABLE_DEPRECATION_WARNINGS
      avctx->coded_frame->quality = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;
  FF_ENABLE_DEPRECATION_WARNINGS
  #endif
  
      sd = av_packet_new_side_data(pkt, AV_PKT_DATA_QUALITY_FACTOR, sizeof(int));
      if (!sd)
          return AVERROR(ENOMEM);
      *(int *)sd = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;
  
      x4->out_frame_count++;
      *got_packet = ret;
      return 0;
  }
  
  static av_cold int XAVS_close(AVCodecContext *avctx)
  {
      XavsContext *x4 = avctx->priv_data;
  
      av_freep(&avctx->extradata);
      av_free(x4->sei);
      av_freep(&x4->pts_buffer);
  
      if (x4->enc)
          xavs_encoder_close(x4->enc);
  
      return 0;
  }
  
  static av_cold int XAVS_init(AVCodecContext *avctx)
  {
      XavsContext *x4 = avctx->priv_data;
  
      x4->sei_size = 0;
      xavs_param_default(&x4->params);
  
      x4->params.pf_log               = XAVS_log;
      x4->params.p_log_private        = avctx;
      x4->params.i_keyint_max         = avctx->gop_size;
      if (avctx->bit_rate) {
          x4->params.rc.i_bitrate   = avctx->bit_rate / 1000;
          x4->params.rc.i_rc_method = XAVS_RC_ABR;
      }
      x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000;
      x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate    / 1000;
      x4->params.rc.b_stat_write      = avctx->flags & AV_CODEC_FLAG_PASS1;
      if (avctx->flags & AV_CODEC_FLAG_PASS2) {
          x4->params.rc.b_stat_read = 1;
      } else {
          if (x4->crf >= 0) {
              x4->params.rc.i_rc_method   = XAVS_RC_CRF;
              x4->params.rc.f_rf_constant = x4->crf;
          } else if (x4->cqp >= 0) {
              x4->params.rc.i_rc_method   = XAVS_RC_CQP;
              x4->params.rc.i_qp_constant = x4->cqp;
          }
      }
  
      if (x4->aud >= 0)
          x4->params.b_aud                      = x4->aud;
      if (x4->mbtree >= 0)
          x4->params.rc.b_mb_tree               = x4->mbtree;
      if (x4->direct_pred >= 0)
          x4->params.analyse.i_direct_mv_pred   = x4->direct_pred;
      if (x4->fast_pskip >= 0)
          x4->params.analyse.b_fast_pskip       = x4->fast_pskip;
      if (x4->motion_est >= 0)
          x4->params.analyse.i_me_method        = x4->motion_est;
      if (x4->mixed_refs >= 0)
          x4->params.analyse.b_mixed_references = x4->mixed_refs;
      if (x4->b_bias != INT_MIN)
          x4->params.i_bframe_bias              = x4->b_bias;
      if (x4->cplxblur >= 0)
          x4->params.rc.f_complexity_blur = x4->cplxblur;
  
  #if FF_API_MOTION_EST
  FF_DISABLE_DEPRECATION_WARNINGS
      if (x4->motion_est < 0) {
          switch (avctx->me_method) {
          case  ME_EPZS:
              x4->params.analyse.i_me_method = XAVS_ME_DIA;
              break;
          case  ME_HEX:
              x4->params.analyse.i_me_method = XAVS_ME_HEX;
              break;
          case  ME_UMH:
              x4->params.analyse.i_me_method = XAVS_ME_UMH;
              break;
          case  ME_FULL:
              x4->params.analyse.i_me_method = XAVS_ME_ESA;
              break;
          case  ME_TESA:
              x4->params.analyse.i_me_method = XAVS_ME_TESA;
              break;
          default:
              x4->params.analyse.i_me_method = XAVS_ME_HEX;
          }
      }
  FF_ENABLE_DEPRECATION_WARNINGS
  #endif
  
      x4->params.i_bframe          = avctx->max_b_frames;
      /* cabac is not included in AVS JiZhun Profile */
      x4->params.b_cabac           = 0;
  
  #if FF_API_PRIVATE_OPT
  FF_DISABLE_DEPRECATION_WARNINGS
      if (avctx->b_frame_strategy)
          x4->b_frame_strategy = avctx->b_frame_strategy;
  FF_ENABLE_DEPRECATION_WARNINGS
  #endif
  
      x4->params.i_bframe_adaptive = x4->b_frame_strategy;
  
      avctx->has_b_frames          = !!avctx->max_b_frames;
  
      /* AVS doesn't allow B picture as reference */
      /* The max allowed reference frame number of B is 2 */
      x4->params.i_keyint_min      = avctx->keyint_min;
      if (x4->params.i_keyint_min > x4->params.i_keyint_max)
          x4->params.i_keyint_min = x4->params.i_keyint_max;
  
  #if FF_API_PRIVATE_OPT
  FF_DISABLE_DEPRECATION_WARNINGS
      if (avctx->scenechange_threshold)
          x4->scenechange_threshold = avctx->scenechange_threshold;
  FF_ENABLE_DEPRECATION_WARNINGS
  #endif
  
      x4->params.i_scenecut_threshold = x4->scenechange_threshold;
  
     // x4->params.b_deblocking_filter       = avctx->flags & AV_CODEC_FLAG_LOOP_FILTER;
  
      x4->params.rc.i_qp_min                 = avctx->qmin;
      x4->params.rc.i_qp_max                 = avctx->qmax;
      x4->params.rc.i_qp_step                = avctx->max_qdiff;
  
      x4->params.rc.f_qcompress       = avctx->qcompress; /* 0.0 => cbr, 1.0 => constant qp */
      x4->params.rc.f_qblur           = avctx->qblur;     /* temporally blur quants */
  
      x4->params.i_frame_reference    = avctx->refs;
  
      x4->params.i_width              = avctx->width;
      x4->params.i_height             = avctx->height;
      x4->params.vui.i_sar_width      = avctx->sample_aspect_ratio.num;
      x4->params.vui.i_sar_height     = avctx->sample_aspect_ratio.den;
      /* This is only used for counting the fps */
      x4->params.i_fps_num            = avctx->time_base.den;
      x4->params.i_fps_den            = avctx->time_base.num;
      x4->params.analyse.inter        = XAVS_ANALYSE_I8x8 |XAVS_ANALYSE_PSUB16x16| XAVS_ANALYSE_BSUB16x16;
  
      x4->params.analyse.i_me_range = avctx->me_range;
      x4->params.analyse.i_subpel_refine    = avctx->me_subpel_quality;
  
      x4->params.analyse.b_chroma_me        = avctx->me_cmp & FF_CMP_CHROMA;
      /* AVS P2 only enables 8x8 transform */
      x4->params.analyse.b_transform_8x8    = 1; //avctx->flags2 & AV_CODEC_FLAG2_8X8DCT;
  
      x4->params.analyse.i_trellis          = avctx->trellis;
  
  #if FF_API_PRIVATE_OPT
      FF_DISABLE_DEPRECATION_WARNINGS
      if (avctx->noise_reduction >= 0)
          x4->noise_reduction = avctx->noise_reduction;
      FF_ENABLE_DEPRECATION_WARNINGS
  #endif
  
      x4->params.analyse.i_noise_reduction  = x4->noise_reduction;
  
      if (avctx->level > 0)
          x4->params.i_level_idc = avctx->level;
  
      if (avctx->bit_rate > 0)
          x4->params.rc.f_rate_tolerance =
              (float)avctx->bit_rate_tolerance / avctx->bit_rate;
  
      if ((avctx->rc_buffer_size) &&
          (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)) {
          x4->params.rc.f_vbv_buffer_init =
              (float)avctx->rc_initial_buffer_occupancy / avctx->rc_buffer_size;
      } else
          x4->params.rc.f_vbv_buffer_init = 0.9;
  
      /* TAG:do we have MB tree RC method */
      /* what is the RC method we are now using? Default NO */
      x4->params.rc.f_ip_factor             = 1 / fabs(avctx->i_quant_factor);
      x4->params.rc.f_pb_factor             = avctx->b_quant_factor;
  
  #if FF_API_PRIVATE_OPT
  FF_DISABLE_DEPRECATION_WARNINGS
      if (avctx->chromaoffset)
          x4->chroma_offset = avctx->chromaoffset;
  FF_ENABLE_DEPRECATION_WARNINGS
  #endif
  
      x4->params.analyse.i_chroma_qp_offset = x4->chroma_offset;
  
      x4->params.analyse.b_psnr = avctx->flags & AV_CODEC_FLAG_PSNR;
      x4->params.i_log_level    = XAVS_LOG_DEBUG;
      x4->params.i_threads      = avctx->thread_count;
      x4->params.b_interlaced   = avctx->flags & AV_CODEC_FLAG_INTERLACED_DCT;
  
      if (avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER)
          x4->params.b_repeat_headers = 0;
  
      x4->enc = xavs_encoder_open(&x4->params);
      if (!x4->enc)
          return -1;
  
      if (!(x4->pts_buffer = av_mallocz((avctx->max_b_frames+1) * sizeof(*x4->pts_buffer))))
          return AVERROR(ENOMEM);
  
      /* TAG: Do we have GLOBAL HEADER in AVS */
      /* We Have PPS and SPS in AVS */
      if (avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
          xavs_nal_t *nal;
          int nnal, s, i, size;
          uint8_t *p;
  
          s = xavs_encoder_headers(x4->enc, &nal, &nnal);
  
          avctx->extradata = p = av_malloc(s);
          for (i = 0; i < nnal; i++) {
              /* Don't put the SEI in extradata. */
              if (nal[i].i_type == NAL_SEI) {
                  x4->sei = av_malloc( 5 + nal[i].i_payload * 4 / 3 );
                  if (xavs_nal_encode(x4->sei, &x4->sei_size, 1, nal + i) < 0)
                      return -1;
  
                  continue;
              }
              size = xavs_nal_encode(p, &s, 1, nal + i);
              if (size < 0)
                  return -1;
              p += size;
          }
          avctx->extradata_size = p - avctx->extradata;
      }
      return 0;
  }
  
  #define OFFSET(x) offsetof(XavsContext, x)
  #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
  static const AVOption options[] = {
      { "crf",           "Select the quality for constant quality mode",    OFFSET(crf),           AV_OPT_TYPE_FLOAT,  {-1 }, -1, FLT_MAX, VE },
      { "qp",            "Constant quantization parameter rate control method",OFFSET(cqp),        AV_OPT_TYPE_INT,    {.i64 = -1 }, -1, INT_MAX, VE },
      { "b-bias",        "Influences how often B-frames are used",          OFFSET(b_bias),        AV_OPT_TYPE_INT,    {.i64 = INT_MIN}, INT_MIN, INT_MAX, VE },
      { "cplxblur",      "Reduce fluctuations in QP (before curve compression)", OFFSET(cplxblur), AV_OPT_TYPE_FLOAT,  {-1 }, -1, FLT_MAX, VE},
      { "direct-pred",   "Direct MV prediction mode",                       OFFSET(direct_pred),   AV_OPT_TYPE_INT,    {.i64 = -1 }, -1, INT_MAX, VE, "direct-pred" },
      { "none",          NULL,      0,    AV_OPT_TYPE_CONST, { .i64 = XAVS_DIRECT_PRED_NONE },     0, 0, VE, "direct-pred" },
      { "spatial",       NULL,      0,    AV_OPT_TYPE_CONST, { .i64 = XAVS_DIRECT_PRED_SPATIAL },  0, 0, VE, "direct-pred" },
      { "temporal",      NULL,      0,    AV_OPT_TYPE_CONST, { .i64 = XAVS_DIRECT_PRED_TEMPORAL }, 0, 0, VE, "direct-pred" },
      { "auto",          NULL,      0,    AV_OPT_TYPE_CONST, { .i64 = XAVS_DIRECT_PRED_AUTO },     0, 0, VE, "direct-pred" },
      { "aud",           "Use access unit delimiters.",                     OFFSET(aud),           AV_OPT_TYPE_INT,    {.i64 = -1 }, -1, 1, VE},
      { "mbtree",        "Use macroblock tree ratecontrol.",                OFFSET(mbtree),        AV_OPT_TYPE_INT,    {.i64 = -1 }, -1, 1, VE},
      { "mixed-refs",    "One reference per partition, as opposed to one reference per macroblock", OFFSET(mixed_refs), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, VE },
      { "fast-pskip",    NULL,                                              OFFSET(fast_pskip),    AV_OPT_TYPE_INT,    {.i64 = -1 }, -1, 1, VE},
      { "motion-est",   "Set motion estimation method",                     OFFSET(motion_est),    AV_OPT_TYPE_INT,    { .i64 = -1 }, -1, XAVS_ME_TESA, VE, "motion-est"},
      { "dia",           NULL,      0,    AV_OPT_TYPE_CONST, { .i64 = XAVS_ME_DIA },               INT_MIN, INT_MAX, VE, "motion-est" },
      { "hex",           NULL,      0,    AV_OPT_TYPE_CONST, { .i64 = XAVS_ME_HEX },               INT_MIN, INT_MAX, VE, "motion-est" },
      { "umh",           NULL,      0,    AV_OPT_TYPE_CONST, { .i64 = XAVS_ME_UMH },               INT_MIN, INT_MAX, VE, "motion-est" },
      { "esa",           NULL,      0,    AV_OPT_TYPE_CONST, { .i64 = XAVS_ME_ESA },               INT_MIN, INT_MAX, VE, "motion-est" },
      { "tesa",          NULL,      0,    AV_OPT_TYPE_CONST, { .i64 = XAVS_ME_TESA },              INT_MIN, INT_MAX, VE, "motion-est" },
      { "b_strategy",    "Strategy to choose between I/P/B-frames",         OFFSET(b_frame_strategy), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, VE},
      { "chromaoffset", "QP difference between chroma and luma",           OFFSET(chroma_offset), AV_OPT_TYPE_INT, {.i64 = 0 }, INT_MIN, INT_MAX, VE},
      { "sc_threshold", "Scene change threshold",                           OFFSET(scenechange_threshold), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, VE},
      { "noise_reduction", "Noise reduction",                               OFFSET(noise_reduction), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, VE},
  
      { NULL },
  };
  
  static const AVClass class = {
      .class_name = "libxavs",
      .item_name  = av_default_item_name,
      .option     = options,
      .version    = LIBAVUTIL_VERSION_INT,
  };
  
  static const AVCodecDefault xavs_defaults[] = {
      { "b",                "0" },
      { NULL },
  };
  
  AVCodec ff_libxavs_encoder = {
      .name           = "libxavs",
      .long_name      = NULL_IF_CONFIG_SMALL("libxavs Chinese AVS (Audio Video Standard)"),
      .type           = AVMEDIA_TYPE_VIDEO,
      .id             = AV_CODEC_ID_CAVS,
      .priv_data_size = sizeof(XavsContext),
      .init           = XAVS_init,
      .encode2        = XAVS_frame,
      .close          = XAVS_close,
      .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_AUTO_THREADS,
      .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
      .priv_class     = &class,
      .defaults       = xavs_defaults,
  };
  