LCOV - code coverage report
Current view: top level - libavcodec - h263dec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 278 410 67.8 %
Date: 2017-12-17 04:34:43 Functions: 6 6 100.0 %

          Line data    Source code
       1             : /*
       2             :  * H.263 decoder
       3             :  * Copyright (c) 2001 Fabrice Bellard
       4             :  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
       5             :  *
       6             :  * This file is part of FFmpeg.
       7             :  *
       8             :  * FFmpeg is free software; you can redistribute it and/or
       9             :  * modify it under the terms of the GNU Lesser General Public
      10             :  * License as published by the Free Software Foundation; either
      11             :  * version 2.1 of the License, or (at your option) any later version.
      12             :  *
      13             :  * FFmpeg is distributed in the hope that it will be useful,
      14             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      16             :  * Lesser General Public License for more details.
      17             :  *
      18             :  * You should have received a copy of the GNU Lesser General Public
      19             :  * License along with FFmpeg; if not, write to the Free Software
      20             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      21             :  */
      22             : 
      23             : /**
      24             :  * @file
      25             :  * H.263 decoder.
      26             :  */
      27             : 
      28             : #define UNCHECKED_BITSTREAM_READER 1
      29             : 
      30             : #include "libavutil/cpu.h"
      31             : #include "avcodec.h"
      32             : #include "error_resilience.h"
      33             : #include "flv.h"
      34             : #include "h263.h"
      35             : #include "h263_parser.h"
      36             : #include "hwaccel.h"
      37             : #include "internal.h"
      38             : #include "mpeg_er.h"
      39             : #include "mpeg4video.h"
      40             : #include "mpeg4video_parser.h"
      41             : #include "mpegutils.h"
      42             : #include "mpegvideo.h"
      43             : #include "msmpeg4.h"
      44             : #include "qpeldsp.h"
      45             : #include "thread.h"
      46             : #include "wmv2.h"
      47             : 
      48         314 : static enum AVPixelFormat h263_get_format(AVCodecContext *avctx)
      49             : {
      50         314 :     if (avctx->codec->id == AV_CODEC_ID_MSS2)
      51          10 :         return AV_PIX_FMT_YUV420P;
      52             : 
      53             :     if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY)) {
      54             :         if (avctx->color_range == AVCOL_RANGE_UNSPECIFIED)
      55             :             avctx->color_range = AVCOL_RANGE_MPEG;
      56             :         return AV_PIX_FMT_GRAY8;
      57             :     }
      58             : 
      59         304 :     return avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
      60             : }
      61             : 
      62         276 : av_cold int ff_h263_decode_init(AVCodecContext *avctx)
      63             : {
      64         276 :     MpegEncContext *s = avctx->priv_data;
      65             :     int ret;
      66             : 
      67         276 :     s->out_format      = FMT_H263;
      68             : 
      69             :     // set defaults
      70         276 :     ff_mpv_decode_defaults(s);
      71         276 :     ff_mpv_decode_init(s, avctx);
      72             : 
      73         276 :     s->quant_precision = 5;
      74         276 :     s->decode_mb       = ff_h263_decode_mb;
      75         276 :     s->low_delay       = 1;
      76         276 :     s->unrestricted_mv = 1;
      77             : 
      78             :     /* select sub codec */
      79         276 :     switch (avctx->codec->id) {
      80          20 :     case AV_CODEC_ID_H263:
      81             :     case AV_CODEC_ID_H263P:
      82          20 :         s->unrestricted_mv = 0;
      83          20 :         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
      84          20 :         break;
      85         157 :     case AV_CODEC_ID_MPEG4:
      86         157 :         break;
      87           2 :     case AV_CODEC_ID_MSMPEG4V1:
      88           2 :         s->h263_pred       = 1;
      89           2 :         s->msmpeg4_version = 1;
      90           2 :         break;
      91           9 :     case AV_CODEC_ID_MSMPEG4V2:
      92           9 :         s->h263_pred       = 1;
      93           9 :         s->msmpeg4_version = 2;
      94           9 :         break;
      95          13 :     case AV_CODEC_ID_MSMPEG4V3:
      96          13 :         s->h263_pred       = 1;
      97          13 :         s->msmpeg4_version = 3;
      98          13 :         break;
      99           9 :     case AV_CODEC_ID_WMV1:
     100           9 :         s->h263_pred       = 1;
     101           9 :         s->msmpeg4_version = 4;
     102           9 :         break;
     103          12 :     case AV_CODEC_ID_WMV2:
     104          12 :         s->h263_pred       = 1;
     105          12 :         s->msmpeg4_version = 5;
     106          12 :         break;
     107          36 :     case AV_CODEC_ID_VC1:
     108             :     case AV_CODEC_ID_WMV3:
     109             :     case AV_CODEC_ID_VC1IMAGE:
     110             :     case AV_CODEC_ID_WMV3IMAGE:
     111             :     case AV_CODEC_ID_MSS2:
     112          36 :         s->h263_pred       = 1;
     113          36 :         s->msmpeg4_version = 6;
     114          36 :         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
     115          36 :         break;
     116           0 :     case AV_CODEC_ID_H263I:
     117           0 :         break;
     118          18 :     case AV_CODEC_ID_FLV1:
     119          18 :         s->h263_flv = 1;
     120          18 :         break;
     121           0 :     default:
     122           0 :         av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
     123           0 :                avctx->codec->id);
     124           0 :         return AVERROR(ENOSYS);
     125             :     }
     126         276 :     s->codec_id    = avctx->codec->id;
     127             : 
     128         276 :     if (avctx->codec_tag == AV_RL32("L263") || avctx->codec_tag == AV_RL32("S263"))
     129           0 :         if (avctx->extradata_size == 56 && avctx->extradata[0] == 1)
     130           0 :             s->ehc_mode = 1;
     131             : 
     132             :     /* for H.263, we allocate the images after having read the header */
     133         532 :     if (avctx->codec->id != AV_CODEC_ID_H263 &&
     134         512 :         avctx->codec->id != AV_CODEC_ID_H263P &&
     135         256 :         avctx->codec->id != AV_CODEC_ID_MPEG4) {
     136          99 :         avctx->pix_fmt = h263_get_format(avctx);
     137          99 :         ff_mpv_idct_init(s);
     138          99 :         if ((ret = ff_mpv_common_init(s)) < 0)
     139           0 :             return ret;
     140             :     }
     141             : 
     142         276 :     ff_h263dsp_init(&s->h263dsp);
     143         276 :     ff_qpeldsp_init(&s->qdsp);
     144         276 :     ff_h263_decode_init_vlc();
     145             : 
     146         276 :     return 0;
     147             : }
     148             : 
     149         240 : av_cold int ff_h263_decode_end(AVCodecContext *avctx)
     150             : {
     151         240 :     MpegEncContext *s = avctx->priv_data;
     152             : 
     153         240 :     ff_mpv_common_end(s);
     154         240 :     return 0;
     155             : }
     156             : 
     157             : /**
     158             :  * Return the number of bytes consumed for building the current frame.
     159             :  */
     160        5672 : static int get_consumed_bytes(MpegEncContext *s, int buf_size)
     161             : {
     162        5672 :     int pos = (get_bits_count(&s->gb) + 7) >> 3;
     163             : 
     164        5672 :     if (s->divx_packed || s->avctx->hwaccel) {
     165             :         /* We would have to scan through the whole buf to handle the weird
     166             :          * reordering ... */
     167          17 :         return buf_size;
     168        5655 :     } else if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
     169           0 :         pos -= s->parse_context.last_index;
     170             :         // padding is not really read so this might be -1
     171           0 :         if (pos < 0)
     172           0 :             pos = 0;
     173           0 :         return pos;
     174             :     } else {
     175             :         // avoid infinite loops (maybe not needed...)
     176        5655 :         if (pos == 0)
     177           0 :             pos = 1;
     178             :         // oops ;)
     179        5655 :         if (pos + 10 > buf_size)
     180        5498 :             pos = buf_size;
     181             : 
     182        5655 :         return pos;
     183             :     }
     184             : }
     185             : 
     186       11921 : static int decode_slice(MpegEncContext *s)
     187             : {
     188       23842 :     const int part_mask = s->partitioned_frame
     189       11921 :                           ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
     190       11921 :     const int mb_size   = 16 >> s->avctx->lowres;
     191             :     int ret;
     192             : 
     193       11921 :     s->last_resync_gb   = s->gb;
     194       11921 :     s->first_slice_line = 1;
     195       11921 :     s->resync_mb_x      = s->mb_x;
     196       11921 :     s->resync_mb_y      = s->mb_y;
     197             : 
     198       11921 :     ff_set_qscale(s, s->qscale);
     199             : 
     200       11921 :     if (s->avctx->hwaccel) {
     201           0 :         const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
     202           0 :         ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start);
     203             :         // ensure we exit decode loop
     204           0 :         s->mb_y = s->mb_height;
     205           0 :         return ret;
     206             :     }
     207             : 
     208       11921 :     if (s->partitioned_frame) {
     209        1728 :         const int qscale = s->qscale;
     210             : 
     211        1728 :         if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
     212        1728 :             if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
     213           0 :                 return ret;
     214             : 
     215             :         /* restore variables which were modified */
     216        1728 :         s->first_slice_line = 1;
     217        1728 :         s->mb_x             = s->resync_mb_x;
     218        1728 :         s->mb_y             = s->resync_mb_y;
     219        1728 :         ff_set_qscale(s, qscale);
     220             :     }
     221             : 
     222       94877 :     for (; s->mb_y < s->mb_height; s->mb_y++) {
     223             :         /* per-row end of slice checks */
     224       93531 :         if (s->msmpeg4_version) {
     225       19665 :             if (s->resync_mb_y + s->slice_height == s->mb_y) {
     226           0 :                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
     227           0 :                                 s->mb_x - 1, s->mb_y, ER_MB_END);
     228             : 
     229           0 :                 return 0;
     230             :             }
     231             :         }
     232             : 
     233       93531 :         if (s->msmpeg4_version == 1) {
     234         750 :             s->last_dc[0] =
     235         750 :             s->last_dc[1] =
     236         750 :             s->last_dc[2] = 128;
     237             :         }
     238             : 
     239       93531 :         ff_init_block_index(s);
     240     2228486 :         for (; s->mb_x < s->mb_width; s->mb_x++) {
     241             :             int ret;
     242             : 
     243     2145530 :             ff_update_block_index(s);
     244             : 
     245     2145530 :             if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
     246        7352 :                 s->first_slice_line = 0;
     247             : 
     248             :             /* DCT & quantize */
     249             : 
     250     2145530 :             s->mv_dir  = MV_DIR_FORWARD;
     251     2145530 :             s->mv_type = MV_TYPE_16X16;
     252             :             ff_dlog(s, "%d %06X\n",
     253             :                     get_bits_count(&s->gb), show_bits(&s->gb, 24));
     254             : 
     255             :             ff_tlog(NULL, "Decoding MB at %dx%d\n", s->mb_x, s->mb_y);
     256     2145530 :             ret = s->decode_mb(s, s->block);
     257             : 
     258     2145530 :             if (s->pict_type != AV_PICTURE_TYPE_B)
     259     1908706 :                 ff_h263_update_motion_val(s);
     260             : 
     261     2145530 :             if (ret < 0) {
     262       10575 :                 const int xy = s->mb_x + s->mb_y * s->mb_stride;
     263       10575 :                 if (ret == SLICE_END) {
     264       10575 :                     ff_mpv_reconstruct_mb(s, s->block);
     265       10575 :                     if (s->loop_filter)
     266           0 :                         ff_h263_loop_filter(s);
     267             : 
     268       10575 :                     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
     269             :                                     s->mb_x, s->mb_y, ER_MB_END & part_mask);
     270             : 
     271       10575 :                     s->padding_bug_score--;
     272             : 
     273       10575 :                     if (++s->mb_x >= s->mb_width) {
     274        7622 :                         s->mb_x = 0;
     275        7622 :                         ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
     276        7622 :                         ff_mpv_report_decode_progress(s);
     277        7622 :                         s->mb_y++;
     278             :                     }
     279       10575 :                     return 0;
     280           0 :                 } else if (ret == SLICE_NOEND) {
     281           0 :                     av_log(s->avctx, AV_LOG_ERROR,
     282             :                            "Slice mismatch at MB: %d\n", xy);
     283           0 :                     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
     284           0 :                                     s->mb_x + 1, s->mb_y,
     285             :                                     ER_MB_END & part_mask);
     286           0 :                     return AVERROR_INVALIDDATA;
     287             :                 }
     288           0 :                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
     289           0 :                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
     290             :                                 s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
     291             : 
     292           0 :                 if (s->avctx->err_recognition & AV_EF_IGNORE_ERR)
     293           0 :                     continue;
     294           0 :                 return AVERROR_INVALIDDATA;
     295             :             }
     296             : 
     297     2134955 :             ff_mpv_reconstruct_mb(s, s->block);
     298     2134955 :             if (s->loop_filter)
     299      141300 :                 ff_h263_loop_filter(s);
     300             :         }
     301             : 
     302       82956 :         ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
     303       82956 :         ff_mpv_report_decode_progress(s);
     304             : 
     305       82956 :         s->mb_x = 0;
     306             :     }
     307             : 
     308             :     av_assert1(s->mb_x == 0 && s->mb_y == s->mb_height);
     309             : 
     310        1346 :     if (s->codec_id == AV_CODEC_ID_MPEG4         &&
     311           0 :         (s->workaround_bugs & FF_BUG_AUTODETECT) &&
     312           0 :         get_bits_left(&s->gb) >= 48              &&
     313           0 :         show_bits(&s->gb, 24) == 0x4010          &&
     314           0 :         !s->data_partitioning)
     315           0 :         s->padding_bug_score += 32;
     316             : 
     317             :     /* try to detect the padding bug */
     318        1346 :     if (s->codec_id == AV_CODEC_ID_MPEG4         &&
     319           0 :         (s->workaround_bugs & FF_BUG_AUTODETECT) &&
     320           0 :         get_bits_left(&s->gb) >= 0               &&
     321           0 :         get_bits_left(&s->gb) < 137              &&
     322           0 :         !s->data_partitioning) {
     323           0 :         const int bits_count = get_bits_count(&s->gb);
     324           0 :         const int bits_left  = s->gb.size_in_bits - bits_count;
     325             : 
     326           0 :         if (bits_left == 0) {
     327           0 :             s->padding_bug_score += 16;
     328           0 :         } else if (bits_left != 1) {
     329           0 :             int v = show_bits(&s->gb, 8);
     330           0 :             v |= 0x7F >> (7 - (bits_count & 7));
     331             : 
     332           0 :             if (v == 0x7F && bits_left <= 8)
     333           0 :                 s->padding_bug_score--;
     334           0 :             else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
     335             :                      bits_left <= 16)
     336           0 :                 s->padding_bug_score += 4;
     337             :             else
     338           0 :                 s->padding_bug_score++;
     339             :         }
     340             :     }
     341             : 
     342        1346 :     if (s->codec_id == AV_CODEC_ID_H263          &&
     343           0 :         (s->workaround_bugs & FF_BUG_AUTODETECT) &&
     344           0 :         get_bits_left(&s->gb) >= 8               &&
     345           0 :         get_bits_left(&s->gb) < 300              &&
     346           0 :         s->pict_type == AV_PICTURE_TYPE_I        &&
     347           0 :         show_bits(&s->gb, 8) == 0                &&
     348           0 :         !s->data_partitioning) {
     349             : 
     350           0 :         s->padding_bug_score += 32;
     351             :     }
     352             : 
     353        1346 :     if (s->codec_id == AV_CODEC_ID_H263          &&
     354           0 :         (s->workaround_bugs & FF_BUG_AUTODETECT) &&
     355           0 :         get_bits_left(&s->gb) >= 64              &&
     356           0 :         AV_RB64(s->gb.buffer_end - 8) == 0xCDCDCDCDFC7F0000) {
     357             : 
     358           0 :         s->padding_bug_score += 32;
     359             :     }
     360             : 
     361        1346 :     if (s->workaround_bugs & FF_BUG_AUTODETECT) {
     362        1346 :         if (
     363        2692 :             (s->padding_bug_score > -2 && !s->data_partitioning))
     364        1346 :             s->workaround_bugs |= FF_BUG_NO_PADDING;
     365             :         else
     366           0 :             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
     367             :     }
     368             : 
     369             :     // handle formats which don't have unique end markers
     370        1346 :     if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
     371        1346 :         int left      = get_bits_left(&s->gb);
     372        1346 :         int max_extra = 7;
     373             : 
     374             :         /* no markers in M$ crap */
     375        1346 :         if (s->msmpeg4_version && s->pict_type == AV_PICTURE_TYPE_I)
     376          90 :             max_extra += 17;
     377             : 
     378             :         /* buggy padding but the frame should still end approximately at
     379             :          * the bitstream end */
     380        2692 :         if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
     381        1346 :             (s->avctx->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
     382           0 :             max_extra += 48;
     383        1346 :         else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
     384        1346 :             max_extra += 256 * 256 * 256 * 64;
     385             : 
     386        1346 :         if (left > max_extra)
     387           0 :             av_log(s->avctx, AV_LOG_ERROR,
     388             :                    "discarding %d junk bits at end, next would be %X\n",
     389             :                    left, show_bits(&s->gb, 24));
     390        1346 :         else if (left < 0)
     391           0 :             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
     392             :         else
     393        2692 :             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
     394        1346 :                             s->mb_x - 1, s->mb_y, ER_MB_END);
     395             : 
     396        1346 :         return 0;
     397             :     }
     398             : 
     399           0 :     av_log(s->avctx, AV_LOG_ERROR,
     400             :            "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
     401             :            get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
     402             : 
     403           0 :     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
     404             :                     ER_MB_END & part_mask);
     405             : 
     406           0 :     return AVERROR_INVALIDDATA;
     407             : }
     408             : 
     409        5771 : int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     410             :                          AVPacket *avpkt)
     411             : {
     412        5771 :     const uint8_t *buf = avpkt->data;
     413        5771 :     int buf_size       = avpkt->size;
     414        5771 :     MpegEncContext *s  = avctx->priv_data;
     415             :     int ret;
     416        5771 :     int slice_ret = 0;
     417        5771 :     AVFrame *pict = data;
     418             : 
     419             :     /* no supplementary picture */
     420        5771 :     if (buf_size == 0) {
     421             :         /* special case for last picture */
     422          99 :         if (s->low_delay == 0 && s->next_picture_ptr) {
     423          24 :             if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
     424           0 :                 return ret;
     425          24 :             s->next_picture_ptr = NULL;
     426             : 
     427          24 :             *got_frame = 1;
     428             :         }
     429             : 
     430          99 :         return 0;
     431             :     }
     432             : 
     433        5672 :     if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
     434             :         int next;
     435             : 
     436           0 :         if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) {
     437           0 :             next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
     438           0 :         } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
     439           0 :             next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
     440           0 :         } else if (CONFIG_H263P_DECODER && s->codec_id == AV_CODEC_ID_H263P) {
     441           0 :             next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
     442             :         } else {
     443           0 :             av_log(s->avctx, AV_LOG_ERROR,
     444             :                    "this codec does not support truncated bitstreams\n");
     445           0 :             return AVERROR(ENOSYS);
     446             :         }
     447             : 
     448           0 :         if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
     449             :                              &buf_size) < 0)
     450           0 :             return buf_size;
     451             :     }
     452             : 
     453        5672 : retry:
     454        5676 :     if (s->divx_packed && s->bitstream_buffer_size) {
     455             :         int i;
     456           7 :         for(i=0; i < buf_size-3; i++) {
     457           7 :             if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) {
     458           7 :                 if (buf[i+3]==0xB0) {
     459           0 :                     av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
     460           0 :                     s->bitstream_buffer_size = 0;
     461             :                 }
     462           7 :                 break;
     463             :             }
     464             :         }
     465             :     }
     466             : 
     467        5676 :     if (s->bitstream_buffer_size && (s->divx_packed || buf_size <= MAX_NVOP_SIZE)) // divx 5.01+/xvid frame reorder
     468           7 :         ret = init_get_bits8(&s->gb, s->bitstream_buffer,
     469             :                              s->bitstream_buffer_size);
     470             :     else
     471        5669 :         ret = init_get_bits8(&s->gb, buf, buf_size);
     472             : 
     473        5676 :     s->bitstream_buffer_size = 0;
     474        5676 :     if (ret < 0)
     475           0 :         return ret;
     476             : 
     477        5676 :     if (!s->context_initialized)
     478             :         // we need the idct permutation for reading a custom matrix
     479         177 :         ff_mpv_idct_init(s);
     480             : 
     481             :     /* let's go :-) */
     482        5676 :     if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
     483         674 :         ret = ff_wmv2_decode_picture_header(s);
     484        5002 :     } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
     485         675 :         ret = ff_msmpeg4_decode_picture_header(s);
     486        4327 :     } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
     487        3452 :         if (s->avctx->extradata_size && s->picture_number == 0) {
     488             :             GetBitContext gb;
     489             : 
     490         155 :             if (init_get_bits8(&gb, s->avctx->extradata, s->avctx->extradata_size) >= 0 )
     491         155 :                 ff_mpeg4_decode_picture_header(avctx->priv_data, &gb);
     492             :         }
     493        3452 :         ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb);
     494         875 :     } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
     495           0 :         ret = ff_intel_h263_decode_picture_header(s);
     496         875 :     } else if (CONFIG_FLV_DECODER && s->h263_flv) {
     497         414 :         ret = ff_flv_decode_picture_header(s);
     498             :     } else {
     499         461 :         ret = ff_h263_decode_picture_header(s);
     500             :     }
     501             : 
     502        5676 :     if (ret < 0 || ret == FRAME_SKIPPED) {
     503           0 :         if (   s->width  != avctx->coded_width
     504           0 :             || s->height != avctx->coded_height) {
     505           0 :                 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
     506           0 :                 s->width = avctx->coded_width;
     507           0 :                 s->height= avctx->coded_height;
     508             :         }
     509             :     }
     510        5676 :     if (ret == FRAME_SKIPPED)
     511           0 :         return get_consumed_bytes(s, buf_size);
     512             : 
     513             :     /* skip if the header was thrashed */
     514        5676 :     if (ret < 0) {
     515           0 :         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
     516           0 :         return ret;
     517             :     }
     518             : 
     519        5676 :     if (!s->context_initialized) {
     520         177 :         avctx->pix_fmt = h263_get_format(avctx);
     521         177 :         if ((ret = ff_mpv_common_init(s)) < 0)
     522           0 :             return ret;
     523             :     }
     524             : 
     525        5676 :     if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) {
     526        5626 :         int i = ff_find_unused_picture(s->avctx, s->picture, 0);
     527        5626 :         if (i < 0)
     528           0 :             return i;
     529        5626 :         s->current_picture_ptr = &s->picture[i];
     530             :     }
     531             : 
     532        5676 :     avctx->has_b_frames = !s->low_delay;
     533             : 
     534        5676 :     if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
     535        3452 :         if (ff_mpeg4_workaround_bugs(avctx) == 1)
     536           4 :             goto retry;
     537             :     }
     538             : 
     539             :     /* After H.263 & MPEG-4 header decode we have the height, width,
     540             :      * and other parameters. So then we could init the picture.
     541             :      * FIXME: By the way H.263 decoder is evolving it should have
     542             :      * an H263EncContext */
     543       11306 :     if (s->width  != avctx->coded_width  ||
     544       11268 :         s->height != avctx->coded_height ||
     545        5634 :         s->context_reinit) {
     546             :         /* H.263 could change picture size any time */
     547          38 :         s->context_reinit = 0;
     548             : 
     549          38 :         ret = ff_set_dimensions(avctx, s->width, s->height);
     550          38 :         if (ret < 0)
     551           0 :             return ret;
     552             : 
     553          38 :         ff_set_sar(avctx, avctx->sample_aspect_ratio);
     554             : 
     555          38 :         if ((ret = ff_mpv_common_frame_size_change(s)))
     556           0 :             return ret;
     557             : 
     558          38 :         if (avctx->pix_fmt != h263_get_format(avctx)) {
     559           0 :             av_log(avctx, AV_LOG_ERROR, "format change not supported\n");
     560           0 :             avctx->pix_fmt = AV_PIX_FMT_NONE;
     561           0 :             return AVERROR_UNKNOWN;
     562             :         }
     563             :     }
     564             : 
     565       10883 :     if (s->codec_id == AV_CODEC_ID_H263  ||
     566       10422 :         s->codec_id == AV_CODEC_ID_H263P ||
     567        5211 :         s->codec_id == AV_CODEC_ID_H263I)
     568         461 :         s->gob_index = H263_GOB_HEIGHT(s->height);
     569             : 
     570             :     // for skipping the frame
     571        5672 :     s->current_picture.f->pict_type = s->pict_type;
     572        5672 :     s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
     573             : 
     574             :     /* skip B-frames if we don't have reference frames */
     575        6020 :     if (!s->last_picture_ptr &&
     576         696 :         (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
     577           0 :         return get_consumed_bytes(s, buf_size);
     578        5834 :     if ((avctx->skip_frame >= AVDISCARD_NONREF &&
     579        5834 :          s->pict_type == AV_PICTURE_TYPE_B)    ||
     580        5834 :         (avctx->skip_frame >= AVDISCARD_NONKEY &&
     581        5787 :          s->pict_type != AV_PICTURE_TYPE_I)    ||
     582        5625 :         avctx->skip_frame >= AVDISCARD_ALL)
     583         159 :         return get_consumed_bytes(s, buf_size);
     584             : 
     585        5513 :     if (s->next_p_frame_damaged) {
     586           0 :         if (s->pict_type == AV_PICTURE_TYPE_B)
     587           0 :             return get_consumed_bytes(s, buf_size);
     588             :         else
     589           0 :             s->next_p_frame_damaged = 0;
     590             :     }
     591             : 
     592        5513 :     if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
     593        3571 :         s->me.qpel_put = s->qdsp.put_qpel_pixels_tab;
     594        3571 :         s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
     595             :     } else {
     596        1942 :         s->me.qpel_put = s->qdsp.put_no_rnd_qpel_pixels_tab;
     597        1942 :         s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
     598             :     }
     599             : 
     600        5513 :     if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
     601           0 :         return ret;
     602             : 
     603        5513 :     if (!s->divx_packed)
     604        5498 :         ff_thread_finish_setup(avctx);
     605             : 
     606        5513 :     if (avctx->hwaccel) {
     607           0 :         ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
     608           0 :                                           s->gb.buffer_end - s->gb.buffer);
     609           0 :         if (ret < 0 )
     610           0 :             return ret;
     611             :     }
     612             : 
     613        5513 :     ff_mpeg_er_frame_start(s);
     614             : 
     615             :     /* the second part of the wmv2 header contains the MB skip bits which
     616             :      * are stored in current_picture->mb_type which is not available before
     617             :      * ff_mpv_frame_start() */
     618        5513 :     if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
     619         674 :         ret = ff_wmv2_decode_secondary_picture_header(s);
     620         674 :         if (ret < 0)
     621           0 :             return ret;
     622         674 :         if (ret == 1)
     623           3 :             goto frame_end;
     624             :     }
     625             : 
     626             :     /* decode each macroblock */
     627        5510 :     s->mb_x = 0;
     628        5510 :     s->mb_y = 0;
     629             : 
     630        5510 :     slice_ret = decode_slice(s);
     631       17431 :     while (s->mb_y < s->mb_height) {
     632        6411 :         if (s->msmpeg4_version) {
     633           0 :             if (s->slice_height == 0 || s->mb_x != 0 ||
     634           0 :                 (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
     635             :                 break;
     636             :         } else {
     637        6411 :             int prev_x = s->mb_x, prev_y = s->mb_y;
     638        6411 :             if (ff_h263_resync(s) < 0)
     639           0 :                 break;
     640        6411 :             if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
     641          29 :                 s->er.error_occurred = 1;
     642             :         }
     643             : 
     644        6411 :         if (s->msmpeg4_version < 4 && s->h263_pred)
     645        3867 :             ff_mpeg4_clean_buffers(s);
     646             : 
     647        6411 :         if (decode_slice(s) < 0)
     648           0 :             slice_ret = AVERROR_INVALIDDATA;
     649             :     }
     650             : 
     651        7331 :     if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
     652         475 :         s->pict_type == AV_PICTURE_TYPE_I)
     653          44 :         if (!CONFIG_MSMPEG4_DECODER ||
     654          44 :             ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
     655           0 :             s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
     656             : 
     657             :     av_assert1(s->bitstream_buffer_size == 0);
     658       11023 : frame_end:
     659        5513 :     ff_er_frame_end(&s->er);
     660             : 
     661        5513 :     if (avctx->hwaccel) {
     662           0 :         ret = avctx->hwaccel->end_frame(avctx);
     663           0 :         if (ret < 0)
     664           0 :             return ret;
     665             :     }
     666             : 
     667        5513 :     ff_mpv_frame_end(s);
     668             : 
     669        5513 :     if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
     670        3311 :         ff_mpeg4_frame_end(avctx, buf, buf_size);
     671             : 
     672        5513 :     if (!s->divx_packed && avctx->hwaccel)
     673           0 :         ff_thread_finish_setup(avctx);
     674             : 
     675             :     av_assert1(s->current_picture.f->pict_type == s->current_picture_ptr->f->pict_type);
     676             :     av_assert1(s->current_picture.f->pict_type == s->pict_type);
     677        5513 :     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
     678        5126 :         if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
     679           0 :             return ret;
     680        5126 :         ff_print_debug_info(s, s->current_picture_ptr, pict);
     681        5126 :         ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
     682         387 :     } else if (s->last_picture_ptr) {
     683         363 :         if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
     684           0 :             return ret;
     685         363 :         ff_print_debug_info(s, s->last_picture_ptr, pict);
     686         363 :         ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
     687             :     }
     688             : 
     689        5513 :     if (s->last_picture_ptr || s->low_delay) {
     690        5489 :         if (   pict->format == AV_PIX_FMT_YUV420P
     691        5489 :             && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
     692             :             int x, y, p;
     693           0 :             av_frame_make_writable(pict);
     694           0 :             for (p=0; p<3; p++) {
     695           0 :                 int w = AV_CEIL_RSHIFT(pict-> width, !!p);
     696           0 :                 int h = AV_CEIL_RSHIFT(pict->height, !!p);
     697           0 :                 int linesize = pict->linesize[p];
     698           0 :                 for (y=0; y<(h>>1); y++)
     699           0 :                     for (x=0; x<w; x++)
     700           0 :                         FFSWAP(int,
     701             :                                pict->data[p][x + y*linesize],
     702             :                                pict->data[p][x + (h-1-y)*linesize]);
     703             :             }
     704             :         }
     705        5489 :         *got_frame = 1;
     706             :     }
     707             : 
     708        5513 :     if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
     709           0 :         return slice_ret;
     710             :     else
     711        5513 :         return get_consumed_bytes(s, buf_size);
     712             : }
     713             : 
     714             : const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
     715             : #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
     716             :     AV_PIX_FMT_VAAPI,
     717             : #endif
     718             : #if CONFIG_MPEG4_NVDEC_HWACCEL
     719             :     AV_PIX_FMT_CUDA,
     720             : #endif
     721             : #if CONFIG_MPEG4_VDPAU_HWACCEL
     722             :     AV_PIX_FMT_VDPAU,
     723             : #endif
     724             : #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL || CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
     725             :     AV_PIX_FMT_VIDEOTOOLBOX,
     726             : #endif
     727             :     AV_PIX_FMT_YUV420P,
     728             :     AV_PIX_FMT_NONE
     729             : };
     730             : 
     731             : AVCodec ff_h263_decoder = {
     732             :     .name           = "h263",
     733             :     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
     734             :     .type           = AVMEDIA_TYPE_VIDEO,
     735             :     .id             = AV_CODEC_ID_H263,
     736             :     .priv_data_size = sizeof(MpegEncContext),
     737             :     .init           = ff_h263_decode_init,
     738             :     .close          = ff_h263_decode_end,
     739             :     .decode         = ff_h263_decode_frame,
     740             :     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
     741             :                       AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY,
     742             :     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
     743             :     .flush          = ff_mpeg_flush,
     744             :     .max_lowres     = 3,
     745             :     .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
     746             : };
     747             : 
     748             : AVCodec ff_h263p_decoder = {
     749             :     .name           = "h263p",
     750             :     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
     751             :     .type           = AVMEDIA_TYPE_VIDEO,
     752             :     .id             = AV_CODEC_ID_H263P,
     753             :     .priv_data_size = sizeof(MpegEncContext),
     754             :     .init           = ff_h263_decode_init,
     755             :     .close          = ff_h263_decode_end,
     756             :     .decode         = ff_h263_decode_frame,
     757             :     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
     758             :                       AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY,
     759             :     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
     760             :     .flush          = ff_mpeg_flush,
     761             :     .max_lowres     = 3,
     762             :     .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
     763             :     .hw_configs     = (const AVCodecHWConfigInternal*[]) {
     764             : #if CONFIG_H263_VAAPI_HWACCEL
     765             :                         HWACCEL_VAAPI(h263),
     766             : #endif
     767             : #if CONFIG_MPEG4_VDPAU_HWACCEL
     768             :                         HWACCEL_VDPAU(mpeg4),
     769             : #endif
     770             : #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL
     771             :                         HWACCEL_VIDEOTOOLBOX(h263),
     772             : #endif
     773             :                         NULL
     774             :                     },
     775             : };

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