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  1. /*
  2.  * H.26L/H.264/AVC/JVT/14496-10/... decoder
  3.  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * H.264 / AVC / MPEG4 part10 codec.
  25.  * @author Michael Niedermayer <michaelni@gmx.at>
  26.  */
  27.  
  28. #include "libavutil/avassert.h"
  29. #include "libavutil/imgutils.h"
  30. #include "libavutil/timer.h"
  31. #include "internal.h"
  32. #include "cabac.h"
  33. #include "cabac_functions.h"
  34. #include "error_resilience.h"
  35. #include "avcodec.h"
  36. #include "h264.h"
  37. #include "h264data.h"
  38. #include "h264chroma.h"
  39. #include "h264_mvpred.h"
  40. #include "golomb.h"
  41. #include "mathops.h"
  42. #include "mpegutils.h"
  43. #include "rectangle.h"
  44. #include "thread.h"
  45. #include "vdpau_compat.h"
  46.  
  47. void ff_h264_unref_picture(H264Context *h, H264Picture *pic)
  48. {
  49.     int off = offsetof(H264Picture, tf) + sizeof(pic->tf);
  50.     int i;
  51.  
  52.     if (!pic->f || !pic->f->buf[0])
  53.         return;
  54.  
  55.     ff_thread_release_buffer(h->avctx, &pic->tf);
  56.     av_buffer_unref(&pic->hwaccel_priv_buf);
  57.  
  58.     av_buffer_unref(&pic->qscale_table_buf);
  59.     av_buffer_unref(&pic->mb_type_buf);
  60.     for (i = 0; i < 2; i++) {
  61.         av_buffer_unref(&pic->motion_val_buf[i]);
  62.         av_buffer_unref(&pic->ref_index_buf[i]);
  63.     }
  64.  
  65.     memset((uint8_t*)pic + off, 0, sizeof(*pic) - off);
  66. }
  67.  
  68. int ff_h264_ref_picture(H264Context *h, H264Picture *dst, H264Picture *src)
  69. {
  70.     int ret, i;
  71.  
  72.     av_assert0(!dst->f->buf[0]);
  73.     av_assert0(src->f->buf[0]);
  74.  
  75.     src->tf.f = src->f;
  76.     dst->tf.f = dst->f;
  77.     ret = ff_thread_ref_frame(&dst->tf, &src->tf);
  78.     if (ret < 0)
  79.         goto fail;
  80.  
  81.     dst->qscale_table_buf = av_buffer_ref(src->qscale_table_buf);
  82.     dst->mb_type_buf      = av_buffer_ref(src->mb_type_buf);
  83.     if (!dst->qscale_table_buf || !dst->mb_type_buf)
  84.         goto fail;
  85.     dst->qscale_table = src->qscale_table;
  86.     dst->mb_type      = src->mb_type;
  87.  
  88.     for (i = 0; i < 2; i++) {
  89.         dst->motion_val_buf[i] = av_buffer_ref(src->motion_val_buf[i]);
  90.         dst->ref_index_buf[i]  = av_buffer_ref(src->ref_index_buf[i]);
  91.         if (!dst->motion_val_buf[i] || !dst->ref_index_buf[i])
  92.             goto fail;
  93.         dst->motion_val[i] = src->motion_val[i];
  94.         dst->ref_index[i]  = src->ref_index[i];
  95.     }
  96.  
  97.     if (src->hwaccel_picture_private) {
  98.         dst->hwaccel_priv_buf = av_buffer_ref(src->hwaccel_priv_buf);
  99.         if (!dst->hwaccel_priv_buf)
  100.             goto fail;
  101.         dst->hwaccel_picture_private = dst->hwaccel_priv_buf->data;
  102.     }
  103.  
  104.     for (i = 0; i < 2; i++)
  105.         dst->field_poc[i] = src->field_poc[i];
  106.  
  107.     memcpy(dst->ref_poc,   src->ref_poc,   sizeof(src->ref_poc));
  108.     memcpy(dst->ref_count, src->ref_count, sizeof(src->ref_count));
  109.  
  110.     dst->poc           = src->poc;
  111.     dst->frame_num     = src->frame_num;
  112.     dst->mmco_reset    = src->mmco_reset;
  113.     dst->pic_id        = src->pic_id;
  114.     dst->long_ref      = src->long_ref;
  115.     dst->mbaff         = src->mbaff;
  116.     dst->field_picture = src->field_picture;
  117.     dst->reference     = src->reference;
  118.     dst->crop          = src->crop;
  119.     dst->crop_left     = src->crop_left;
  120.     dst->crop_top      = src->crop_top;
  121.     dst->recovered     = src->recovered;
  122.     dst->invalid_gap   = src->invalid_gap;
  123.     dst->sei_recovery_frame_cnt = src->sei_recovery_frame_cnt;
  124.  
  125.     return 0;
  126. fail:
  127.     ff_h264_unref_picture(h, dst);
  128.     return ret;
  129. }
  130.  
  131. void ff_h264_set_erpic(ERPicture *dst, H264Picture *src)
  132. {
  133. #if CONFIG_ERROR_RESILIENCE
  134.     int i;
  135.  
  136.     memset(dst, 0, sizeof(*dst));
  137.  
  138.     if (!src)
  139.         return;
  140.  
  141.     dst->f = src->f;
  142.     dst->tf = &src->tf;
  143.  
  144.     for (i = 0; i < 2; i++) {
  145.         dst->motion_val[i] = src->motion_val[i];
  146.         dst->ref_index[i] = src->ref_index[i];
  147.     }
  148.  
  149.     dst->mb_type = src->mb_type;
  150.     dst->field_picture = src->field_picture;
  151. #endif /* CONFIG_ERROR_RESILIENCE */
  152. }
  153.  
  154. int ff_h264_field_end(H264Context *h, H264SliceContext *sl, int in_setup)
  155. {
  156.     AVCodecContext *const avctx = h->avctx;
  157.     int err = 0;
  158.     h->mb_y = 0;
  159.  
  160. #if FF_API_CAP_VDPAU
  161.     if (CONFIG_H264_VDPAU_DECODER &&
  162.         h->avctx->codec->capabilities & AV_CODEC_CAP_HWACCEL_VDPAU)
  163.         ff_vdpau_h264_set_reference_frames(h);
  164. #endif
  165.  
  166.     if (in_setup || !(avctx->active_thread_type & FF_THREAD_FRAME)) {
  167.         if (!h->droppable) {
  168.             err = ff_h264_execute_ref_pic_marking(h, h->mmco, h->mmco_index);
  169.             h->prev_poc_msb = h->poc_msb;
  170.             h->prev_poc_lsb = h->poc_lsb;
  171.         }
  172.         h->prev_frame_num_offset = h->frame_num_offset;
  173.         h->prev_frame_num        = h->frame_num;
  174.     }
  175.  
  176.     if (avctx->hwaccel) {
  177.         err = avctx->hwaccel->end_frame(avctx);
  178.         if (err < 0)
  179.             av_log(avctx, AV_LOG_ERROR,
  180.                    "hardware accelerator failed to decode picture\n");
  181.     }
  182.  
  183. #if FF_API_CAP_VDPAU
  184.     if (CONFIG_H264_VDPAU_DECODER &&
  185.         h->avctx->codec->capabilities & AV_CODEC_CAP_HWACCEL_VDPAU)
  186.         ff_vdpau_h264_picture_complete(h);
  187. #endif
  188.  
  189. #if CONFIG_ERROR_RESILIENCE
  190.     av_assert0(sl == h->slice_ctx);
  191.     /*
  192.      * FIXME: Error handling code does not seem to support interlaced
  193.      * when slices span multiple rows
  194.      * The ff_er_add_slice calls don't work right for bottom
  195.      * fields; they cause massive erroneous error concealing
  196.      * Error marking covers both fields (top and bottom).
  197.      * This causes a mismatched s->error_count
  198.      * and a bad error table. Further, the error count goes to
  199.      * INT_MAX when called for bottom field, because mb_y is
  200.      * past end by one (callers fault) and resync_mb_y != 0
  201.      * causes problems for the first MB line, too.
  202.      */
  203.     if (!FIELD_PICTURE(h) && h->current_slice && !h->sps.new && h->enable_er) {
  204.         int use_last_pic = h->last_pic_for_ec.f->buf[0] && !sl->ref_count[0];
  205.  
  206.         ff_h264_set_erpic(&sl->er.cur_pic, h->cur_pic_ptr);
  207.  
  208.         if (use_last_pic) {
  209.             ff_h264_set_erpic(&sl->er.last_pic, &h->last_pic_for_ec);
  210.             sl->ref_list[0][0].parent = &h->last_pic_for_ec;
  211.             memcpy(sl->ref_list[0][0].data, h->last_pic_for_ec.f->data, sizeof(sl->ref_list[0][0].data));
  212.             memcpy(sl->ref_list[0][0].linesize, h->last_pic_for_ec.f->linesize, sizeof(sl->ref_list[0][0].linesize));
  213.             sl->ref_list[0][0].reference = h->last_pic_for_ec.reference;
  214.         } else if (sl->ref_count[0]) {
  215.             ff_h264_set_erpic(&sl->er.last_pic, sl->ref_list[0][0].parent);
  216.         } else
  217.             ff_h264_set_erpic(&sl->er.last_pic, NULL);
  218.  
  219.         if (sl->ref_count[1])
  220.             ff_h264_set_erpic(&sl->er.next_pic, sl->ref_list[1][0].parent);
  221.  
  222.         sl->er.ref_count = sl->ref_count[0];
  223.  
  224.         ff_er_frame_end(&sl->er);
  225.         if (use_last_pic)
  226.             memset(&sl->ref_list[0][0], 0, sizeof(sl->ref_list[0][0]));
  227.     }
  228. #endif /* CONFIG_ERROR_RESILIENCE */
  229.  
  230.     if (!in_setup && !h->droppable)
  231.         ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX,
  232.                                   h->picture_structure == PICT_BOTTOM_FIELD);
  233.     emms_c();
  234.  
  235.     h->current_slice = 0;
  236.  
  237.     return err;
  238. }
  239.