text: /*
   * H.26L/H.264/AVC/JVT/14496-10/... decoder
   * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
   *
   * 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
   * H.264 / AVC / MPEG-4 part10 codec.
   * @author Michael Niedermayer <michaelni@gmx.at>
   */
  
  #include "libavutil/avassert.h"
  #include "libavutil/imgutils.h"
  #include "internal.h"
  #include "cabac.h"
  #include "cabac_functions.h"
  #include "error_resilience.h"
  #include "avcodec.h"
  #include "h264dec.h"
  #include "h264data.h"
  #include "h264chroma.h"
  #include "h264_mvpred.h"
  #include "mathops.h"
  #include "mpegutils.h"
  #include "rectangle.h"
  #include "thread.h"
  
  void ff_h264_unref_picture(H264Context *h, H264Picture *pic)
  {
      int off = offsetof(H264Picture, tf_grain) + sizeof(pic->tf_grain);
      int i;
  
      if (!pic->f || !pic->f->buf[0])
          return;
  
      ff_thread_release_buffer(h->avctx, &pic->tf);
      ff_thread_release_buffer(h->avctx, &pic->tf_grain);
      av_buffer_unref(&pic->hwaccel_priv_buf);
  
      av_buffer_unref(&pic->qscale_table_buf);
      av_buffer_unref(&pic->mb_type_buf);
      av_buffer_unref(&pic->pps_buf);
      for (i = 0; i < 2; i++) {
          av_buffer_unref(&pic->motion_val_buf[i]);
          av_buffer_unref(&pic->ref_index_buf[i]);
      }
  
      memset((uint8_t*)pic + off, 0, sizeof(*pic) - off);
  }
  
  static void h264_copy_picture_params(H264Picture *dst, const H264Picture *src)
  {
      dst->qscale_table = src->qscale_table;
      dst->mb_type      = src->mb_type;
      dst->pps          = src->pps;
  
      for (int i = 0; i < 2; i++) {
          dst->motion_val[i] = src->motion_val[i];
          dst->ref_index[i]  = src->ref_index[i];
      }
  
      for (int i = 0; i < 2; i++)
          dst->field_poc[i] = src->field_poc[i];
  
      memcpy(dst->ref_poc,   src->ref_poc,   sizeof(src->ref_poc));
      memcpy(dst->ref_count, src->ref_count, sizeof(src->ref_count));
  
      dst->poc           = src->poc;
      dst->frame_num     = src->frame_num;
      dst->mmco_reset    = src->mmco_reset;
      dst->long_ref      = src->long_ref;
      dst->mbaff         = src->mbaff;
      dst->field_picture = src->field_picture;
      dst->reference     = src->reference;
      dst->recovered     = src->recovered;
      dst->invalid_gap   = src->invalid_gap;
      dst->sei_recovery_frame_cnt = src->sei_recovery_frame_cnt;
      dst->mb_width      = src->mb_width;
      dst->mb_height     = src->mb_height;
      dst->mb_stride     = src->mb_stride;
      dst->needs_fg      = src->needs_fg;
  }
  
  int ff_h264_ref_picture(H264Context *h, H264Picture *dst, H264Picture *src)
  {
      int ret, i;
  
      av_assert0(!dst->f->buf[0]);
      av_assert0(src->f->buf[0]);
      av_assert0(src->tf.f == src->f);
  
      dst->tf.f = dst->f;
      ret = ff_thread_ref_frame(&dst->tf, &src->tf);
      if (ret < 0)
          goto fail;
  
      if (src->needs_fg) {
          av_assert0(src->tf_grain.f == src->f_grain);
          dst->tf_grain.f = dst->f_grain;
          ret = ff_thread_ref_frame(&dst->tf_grain, &src->tf_grain);
          if (ret < 0)
              goto fail;
      }
  
      dst->qscale_table_buf = av_buffer_ref(src->qscale_table_buf);
      dst->mb_type_buf      = av_buffer_ref(src->mb_type_buf);
      dst->pps_buf          = av_buffer_ref(src->pps_buf);
      if (!dst->qscale_table_buf || !dst->mb_type_buf || !dst->pps_buf) {
          ret = AVERROR(ENOMEM);
          goto fail;
      }
  
      for (i = 0; i < 2; i++) {
          dst->motion_val_buf[i] = av_buffer_ref(src->motion_val_buf[i]);
          dst->ref_index_buf[i]  = av_buffer_ref(src->ref_index_buf[i]);
          if (!dst->motion_val_buf[i] || !dst->ref_index_buf[i]) {
              ret = AVERROR(ENOMEM);
              goto fail;
          }
      }
  
      if (src->hwaccel_picture_private) {
          dst->hwaccel_priv_buf = av_buffer_ref(src->hwaccel_priv_buf);
          if (!dst->hwaccel_priv_buf) {
              ret = AVERROR(ENOMEM);
              goto fail;
          }
          dst->hwaccel_picture_private = dst->hwaccel_priv_buf->data;
      }
  
      h264_copy_picture_params(dst, src);
  
      return 0;
  fail:
      ff_h264_unref_picture(h, dst);
      return ret;
  }
  
  int ff_h264_replace_picture(H264Context *h, H264Picture *dst, const H264Picture *src)
  {
      int ret, i;
  
      if (!src->f || !src->f->buf[0]) {
          ff_h264_unref_picture(h, dst);
          return 0;
      }
  
      av_assert0(src->tf.f == src->f);
  
      dst->tf.f = dst->f;
      ff_thread_release_buffer(h->avctx, &dst->tf);
      ret = ff_thread_ref_frame(&dst->tf, &src->tf);
      if (ret < 0)
          goto fail;
  
      if (src->needs_fg) {
          av_assert0(src->tf_grain.f == src->f_grain);
          dst->tf_grain.f = dst->f_grain;
          ff_thread_release_buffer(h->avctx, &dst->tf_grain);
          ret = ff_thread_ref_frame(&dst->tf_grain, &src->tf_grain);
          if (ret < 0)
              goto fail;
      }
  
      ret  = av_buffer_replace(&dst->qscale_table_buf, src->qscale_table_buf);
      ret |= av_buffer_replace(&dst->mb_type_buf, src->mb_type_buf);
      ret |= av_buffer_replace(&dst->pps_buf, src->pps_buf);
      if (ret < 0)
          goto fail;
  
      for (i = 0; i < 2; i++) {
          ret  = av_buffer_replace(&dst->motion_val_buf[i], src->motion_val_buf[i]);
          ret |= av_buffer_replace(&dst->ref_index_buf[i], src->ref_index_buf[i]);
          if (ret < 0)
              goto fail;
      }
  
      ret = av_buffer_replace(&dst->hwaccel_priv_buf, src->hwaccel_priv_buf);
      if (ret < 0)
          goto fail;
  
      dst->hwaccel_picture_private = src->hwaccel_picture_private;
  
      h264_copy_picture_params(dst, src);
  
      return 0;
  fail:
      ff_h264_unref_picture(h, dst);
      return ret;
  }
  
  void ff_h264_set_erpic(ERPicture *dst, H264Picture *src)
  {
  #if CONFIG_ERROR_RESILIENCE
      int i;
  
      memset(dst, 0, sizeof(*dst));
  
      if (!src)
          return;
  
      dst->f = src->f;
      dst->tf = &src->tf;
  
      for (i = 0; i < 2; i++) {
          dst->motion_val[i] = src->motion_val[i];
          dst->ref_index[i] = src->ref_index[i];
      }
  
      dst->mb_type = src->mb_type;
      dst->field_picture = src->field_picture;
  #endif /* CONFIG_ERROR_RESILIENCE */
  }
  
  int ff_h264_field_end(H264Context *h, H264SliceContext *sl, int in_setup)
  {
      AVCodecContext *const avctx = h->avctx;
      H264Picture *cur = h->cur_pic_ptr;
      int err = 0;
      h->mb_y = 0;
  
      if (in_setup || !(avctx->active_thread_type & FF_THREAD_FRAME)) {
          if (!h->droppable) {
              err = ff_h264_execute_ref_pic_marking(h);
              h->poc.prev_poc_msb = h->poc.poc_msb;
              h->poc.prev_poc_lsb = h->poc.poc_lsb;
          }
          h->poc.prev_frame_num_offset = h->poc.frame_num_offset;
          h->poc.prev_frame_num        = h->poc.frame_num;
      }
  
      if (avctx->hwaccel) {
          err = avctx->hwaccel->end_frame(avctx);
          if (err < 0)
              av_log(avctx, AV_LOG_ERROR,
                     "hardware accelerator failed to decode picture\n");
      } else if (!in_setup && cur->needs_fg && (!FIELD_PICTURE(h) || !h->first_field)) {
          AVFrameSideData *sd = av_frame_get_side_data(cur->f, AV_FRAME_DATA_FILM_GRAIN_PARAMS);
          av_assert0(sd); // always present if `cur->needs_fg`
          err = ff_h274_apply_film_grain(cur->f_grain, cur->f, &h->h274db,
                                         (AVFilmGrainParams *) sd->data);
          if (err < 0) {
              av_log(h->avctx, AV_LOG_WARNING, "Failed synthesizing film "
                     "grain, ignoring: %s\n", av_err2str(err));
              cur->needs_fg = 0;
              err = 0;
          }
      }
  
      if (!in_setup && !h->droppable)
          ff_thread_report_progress(&cur->tf, INT_MAX,
                                    h->picture_structure == PICT_BOTTOM_FIELD);
      emms_c();
  
      h->current_slice = 0;
  
      return err;
  }
  