LCOV - code coverage report
Current view: top level - libavcodec - h263dec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 280 415 67.5 %
Date: 2018-05-20 11:54:08 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             :     /* MPEG-4 Studio Profile only, not supported by hardware */
      51         314 :     if (avctx->bits_per_raw_sample > 8) {
      52             :         av_assert1(avctx->profile == FF_PROFILE_MPEG4_SIMPLE_STUDIO);
      53           0 :         return avctx->pix_fmt;
      54             :     }
      55             : 
      56         314 :     if (avctx->codec->id == AV_CODEC_ID_MSS2)
      57          10 :         return AV_PIX_FMT_YUV420P;
      58             : 
      59             :     if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY)) {
      60             :         if (avctx->color_range == AVCOL_RANGE_UNSPECIFIED)
      61             :             avctx->color_range = AVCOL_RANGE_MPEG;
      62             :         return AV_PIX_FMT_GRAY8;
      63             :     }
      64             : 
      65         304 :     return avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
      66             : }
      67             : 
      68         276 : av_cold int ff_h263_decode_init(AVCodecContext *avctx)
      69             : {
      70         276 :     MpegEncContext *s = avctx->priv_data;
      71             :     int ret;
      72             : 
      73         276 :     s->out_format      = FMT_H263;
      74             : 
      75             :     // set defaults
      76         276 :     ff_mpv_decode_defaults(s);
      77         276 :     ff_mpv_decode_init(s, avctx);
      78             : 
      79         276 :     s->quant_precision = 5;
      80         276 :     s->decode_mb       = ff_h263_decode_mb;
      81         276 :     s->low_delay       = 1;
      82         276 :     s->unrestricted_mv = 1;
      83             : 
      84             :     /* select sub codec */
      85         276 :     switch (avctx->codec->id) {
      86          20 :     case AV_CODEC_ID_H263:
      87             :     case AV_CODEC_ID_H263P:
      88          20 :         s->unrestricted_mv = 0;
      89          20 :         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
      90          20 :         break;
      91         157 :     case AV_CODEC_ID_MPEG4:
      92         157 :         break;
      93           2 :     case AV_CODEC_ID_MSMPEG4V1:
      94           2 :         s->h263_pred       = 1;
      95           2 :         s->msmpeg4_version = 1;
      96           2 :         break;
      97           9 :     case AV_CODEC_ID_MSMPEG4V2:
      98           9 :         s->h263_pred       = 1;
      99           9 :         s->msmpeg4_version = 2;
     100           9 :         break;
     101          13 :     case AV_CODEC_ID_MSMPEG4V3:
     102          13 :         s->h263_pred       = 1;
     103          13 :         s->msmpeg4_version = 3;
     104          13 :         break;
     105           9 :     case AV_CODEC_ID_WMV1:
     106           9 :         s->h263_pred       = 1;
     107           9 :         s->msmpeg4_version = 4;
     108           9 :         break;
     109          12 :     case AV_CODEC_ID_WMV2:
     110          12 :         s->h263_pred       = 1;
     111          12 :         s->msmpeg4_version = 5;
     112          12 :         break;
     113          36 :     case AV_CODEC_ID_VC1:
     114             :     case AV_CODEC_ID_WMV3:
     115             :     case AV_CODEC_ID_VC1IMAGE:
     116             :     case AV_CODEC_ID_WMV3IMAGE:
     117             :     case AV_CODEC_ID_MSS2:
     118          36 :         s->h263_pred       = 1;
     119          36 :         s->msmpeg4_version = 6;
     120          36 :         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
     121          36 :         break;
     122           0 :     case AV_CODEC_ID_H263I:
     123           0 :         break;
     124          18 :     case AV_CODEC_ID_FLV1:
     125          18 :         s->h263_flv = 1;
     126          18 :         break;
     127           0 :     default:
     128           0 :         av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
     129           0 :                avctx->codec->id);
     130           0 :         return AVERROR(ENOSYS);
     131             :     }
     132         276 :     s->codec_id    = avctx->codec->id;
     133             : 
     134         276 :     if (avctx->codec_tag == AV_RL32("L263") || avctx->codec_tag == AV_RL32("S263"))
     135           0 :         if (avctx->extradata_size == 56 && avctx->extradata[0] == 1)
     136           0 :             s->ehc_mode = 1;
     137             : 
     138             :     /* for H.263, we allocate the images after having read the header */
     139         532 :     if (avctx->codec->id != AV_CODEC_ID_H263 &&
     140         512 :         avctx->codec->id != AV_CODEC_ID_H263P &&
     141         256 :         avctx->codec->id != AV_CODEC_ID_MPEG4) {
     142          99 :         avctx->pix_fmt = h263_get_format(avctx);
     143          99 :         ff_mpv_idct_init(s);
     144          99 :         if ((ret = ff_mpv_common_init(s)) < 0)
     145           0 :             return ret;
     146             :     }
     147             : 
     148         276 :     ff_h263dsp_init(&s->h263dsp);
     149         276 :     ff_qpeldsp_init(&s->qdsp);
     150         276 :     ff_h263_decode_init_vlc();
     151             : 
     152         276 :     return 0;
     153             : }
     154             : 
     155         240 : av_cold int ff_h263_decode_end(AVCodecContext *avctx)
     156             : {
     157         240 :     MpegEncContext *s = avctx->priv_data;
     158             : 
     159         240 :     ff_mpv_common_end(s);
     160         240 :     return 0;
     161             : }
     162             : 
     163             : /**
     164             :  * Return the number of bytes consumed for building the current frame.
     165             :  */
     166        5672 : static int get_consumed_bytes(MpegEncContext *s, int buf_size)
     167             : {
     168        5672 :     int pos = (get_bits_count(&s->gb) + 7) >> 3;
     169             : 
     170        5672 :     if (s->divx_packed || s->avctx->hwaccel) {
     171             :         /* We would have to scan through the whole buf to handle the weird
     172             :          * reordering ... */
     173          17 :         return buf_size;
     174        5655 :     } else if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
     175           0 :         pos -= s->parse_context.last_index;
     176             :         // padding is not really read so this might be -1
     177           0 :         if (pos < 0)
     178           0 :             pos = 0;
     179           0 :         return pos;
     180             :     } else {
     181             :         // avoid infinite loops (maybe not needed...)
     182        5655 :         if (pos == 0)
     183           0 :             pos = 1;
     184             :         // oops ;)
     185        5655 :         if (pos + 10 > buf_size)
     186        5498 :             pos = buf_size;
     187             : 
     188        5655 :         return pos;
     189             :     }
     190             : }
     191             : 
     192       11921 : static int decode_slice(MpegEncContext *s)
     193             : {
     194       23842 :     const int part_mask = s->partitioned_frame
     195       11921 :                           ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
     196       11921 :     const int mb_size   = 16 >> s->avctx->lowres;
     197             :     int ret;
     198             : 
     199       11921 :     s->last_resync_gb   = s->gb;
     200       11921 :     s->first_slice_line = 1;
     201       11921 :     s->resync_mb_x      = s->mb_x;
     202       11921 :     s->resync_mb_y      = s->mb_y;
     203             : 
     204       11921 :     ff_set_qscale(s, s->qscale);
     205             : 
     206       11921 :     if (s->studio_profile) {
     207           0 :         if ((ret = ff_mpeg4_decode_studio_slice_header(s->avctx->priv_data)) < 0)
     208           0 :             return ret;
     209             :     }
     210             : 
     211       11921 :     if (s->avctx->hwaccel) {
     212           0 :         const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
     213           0 :         ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start);
     214             :         // ensure we exit decode loop
     215           0 :         s->mb_y = s->mb_height;
     216           0 :         return ret;
     217             :     }
     218             : 
     219       11921 :     if (s->partitioned_frame) {
     220        1728 :         const int qscale = s->qscale;
     221             : 
     222        1728 :         if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
     223        1728 :             if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
     224           0 :                 return ret;
     225             : 
     226             :         /* restore variables which were modified */
     227        1728 :         s->first_slice_line = 1;
     228        1728 :         s->mb_x             = s->resync_mb_x;
     229        1728 :         s->mb_y             = s->resync_mb_y;
     230        1728 :         ff_set_qscale(s, qscale);
     231             :     }
     232             : 
     233       94877 :     for (; s->mb_y < s->mb_height; s->mb_y++) {
     234             :         /* per-row end of slice checks */
     235       93531 :         if (s->msmpeg4_version) {
     236       19665 :             if (s->resync_mb_y + s->slice_height == s->mb_y) {
     237           0 :                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
     238           0 :                                 s->mb_x - 1, s->mb_y, ER_MB_END);
     239             : 
     240           0 :                 return 0;
     241             :             }
     242             :         }
     243             : 
     244       93531 :         if (s->msmpeg4_version == 1) {
     245         750 :             s->last_dc[0] =
     246         750 :             s->last_dc[1] =
     247         750 :             s->last_dc[2] = 128;
     248             :         }
     249             : 
     250       93531 :         ff_init_block_index(s);
     251     2228486 :         for (; s->mb_x < s->mb_width; s->mb_x++) {
     252             :             int ret;
     253             : 
     254     2145530 :             ff_update_block_index(s);
     255             : 
     256     2145530 :             if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
     257        7352 :                 s->first_slice_line = 0;
     258             : 
     259             :             /* DCT & quantize */
     260             : 
     261     2145530 :             s->mv_dir  = MV_DIR_FORWARD;
     262     2145530 :             s->mv_type = MV_TYPE_16X16;
     263             :             ff_dlog(s, "%d %06X\n",
     264             :                     get_bits_count(&s->gb), show_bits(&s->gb, 24));
     265             : 
     266             :             ff_tlog(NULL, "Decoding MB at %dx%d\n", s->mb_x, s->mb_y);
     267     2145530 :             ret = s->decode_mb(s, s->block);
     268             : 
     269     2145530 :             if (s->pict_type != AV_PICTURE_TYPE_B)
     270     1908706 :                 ff_h263_update_motion_val(s);
     271             : 
     272     2145530 :             if (ret < 0) {
     273       10575 :                 const int xy = s->mb_x + s->mb_y * s->mb_stride;
     274       10575 :                 if (ret == SLICE_END) {
     275       10575 :                     ff_mpv_reconstruct_mb(s, s->block);
     276       10575 :                     if (s->loop_filter)
     277           0 :                         ff_h263_loop_filter(s);
     278             : 
     279       10575 :                     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
     280             :                                     s->mb_x, s->mb_y, ER_MB_END & part_mask);
     281             : 
     282       10575 :                     s->padding_bug_score--;
     283             : 
     284       10575 :                     if (++s->mb_x >= s->mb_width) {
     285        7622 :                         s->mb_x = 0;
     286        7622 :                         ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
     287        7622 :                         ff_mpv_report_decode_progress(s);
     288        7622 :                         s->mb_y++;
     289             :                     }
     290       10575 :                     return 0;
     291           0 :                 } else if (ret == SLICE_NOEND) {
     292           0 :                     av_log(s->avctx, AV_LOG_ERROR,
     293             :                            "Slice mismatch at MB: %d\n", xy);
     294           0 :                     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
     295           0 :                                     s->mb_x + 1, s->mb_y,
     296             :                                     ER_MB_END & part_mask);
     297           0 :                     return AVERROR_INVALIDDATA;
     298             :                 }
     299           0 :                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
     300           0 :                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
     301             :                                 s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
     302             : 
     303           0 :                 if (s->avctx->err_recognition & AV_EF_IGNORE_ERR)
     304           0 :                     continue;
     305           0 :                 return AVERROR_INVALIDDATA;
     306             :             }
     307             : 
     308     2134955 :             ff_mpv_reconstruct_mb(s, s->block);
     309     2134955 :             if (s->loop_filter)
     310      141300 :                 ff_h263_loop_filter(s);
     311             :         }
     312             : 
     313       82956 :         ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
     314       82956 :         ff_mpv_report_decode_progress(s);
     315             : 
     316       82956 :         s->mb_x = 0;
     317             :     }
     318             : 
     319             :     av_assert1(s->mb_x == 0 && s->mb_y == s->mb_height);
     320             : 
     321             :     // Detect incorrect padding with wrong stuffing codes used by NEC N-02B
     322        1346 :     if (s->codec_id == AV_CODEC_ID_MPEG4         &&
     323           0 :         (s->workaround_bugs & FF_BUG_AUTODETECT) &&
     324           0 :         get_bits_left(&s->gb) >= 48              &&
     325           0 :         show_bits(&s->gb, 24) == 0x4010          &&
     326           0 :         !s->data_partitioning)
     327           0 :         s->padding_bug_score += 32;
     328             : 
     329             :     /* try to detect the padding bug */
     330        1346 :     if (s->codec_id == AV_CODEC_ID_MPEG4         &&
     331           0 :         (s->workaround_bugs & FF_BUG_AUTODETECT) &&
     332           0 :         get_bits_left(&s->gb) >= 0               &&
     333           0 :         get_bits_left(&s->gb) < 137              &&
     334           0 :         !s->data_partitioning) {
     335           0 :         const int bits_count = get_bits_count(&s->gb);
     336           0 :         const int bits_left  = s->gb.size_in_bits - bits_count;
     337             : 
     338           0 :         if (bits_left == 0) {
     339           0 :             s->padding_bug_score += 16;
     340           0 :         } else if (bits_left != 1) {
     341           0 :             int v = show_bits(&s->gb, 8);
     342           0 :             v |= 0x7F >> (7 - (bits_count & 7));
     343             : 
     344           0 :             if (v == 0x7F && bits_left <= 8)
     345           0 :                 s->padding_bug_score--;
     346           0 :             else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
     347             :                      bits_left <= 16)
     348           0 :                 s->padding_bug_score += 4;
     349             :             else
     350           0 :                 s->padding_bug_score++;
     351             :         }
     352             :     }
     353             : 
     354        1346 :     if (s->codec_id == AV_CODEC_ID_H263          &&
     355           0 :         (s->workaround_bugs & FF_BUG_AUTODETECT) &&
     356           0 :         get_bits_left(&s->gb) >= 8               &&
     357           0 :         get_bits_left(&s->gb) < 300              &&
     358           0 :         s->pict_type == AV_PICTURE_TYPE_I        &&
     359           0 :         show_bits(&s->gb, 8) == 0                &&
     360           0 :         !s->data_partitioning) {
     361             : 
     362           0 :         s->padding_bug_score += 32;
     363             :     }
     364             : 
     365        1346 :     if (s->codec_id == AV_CODEC_ID_H263          &&
     366           0 :         (s->workaround_bugs & FF_BUG_AUTODETECT) &&
     367           0 :         get_bits_left(&s->gb) >= 64              &&
     368           0 :         AV_RB64(s->gb.buffer_end - 8) == 0xCDCDCDCDFC7F0000) {
     369             : 
     370           0 :         s->padding_bug_score += 32;
     371             :     }
     372             : 
     373        1346 :     if (s->workaround_bugs & FF_BUG_AUTODETECT) {
     374        1346 :         if (
     375        2692 :             (s->padding_bug_score > -2 && !s->data_partitioning))
     376        1346 :             s->workaround_bugs |= FF_BUG_NO_PADDING;
     377             :         else
     378           0 :             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
     379             :     }
     380             : 
     381             :     // handle formats which don't have unique end markers
     382        1346 :     if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
     383        1346 :         int left      = get_bits_left(&s->gb);
     384        1346 :         int max_extra = 7;
     385             : 
     386             :         /* no markers in M$ crap */
     387        1346 :         if (s->msmpeg4_version && s->pict_type == AV_PICTURE_TYPE_I)
     388          90 :             max_extra += 17;
     389             : 
     390             :         /* buggy padding but the frame should still end approximately at
     391             :          * the bitstream end */
     392        2692 :         if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
     393        1346 :             (s->avctx->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
     394           0 :             max_extra += 48;
     395        1346 :         else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
     396        1346 :             max_extra += 256 * 256 * 256 * 64;
     397             : 
     398        1346 :         if (left > max_extra)
     399           0 :             av_log(s->avctx, AV_LOG_ERROR,
     400             :                    "discarding %d junk bits at end, next would be %X\n",
     401             :                    left, show_bits(&s->gb, 24));
     402        1346 :         else if (left < 0)
     403           0 :             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
     404             :         else
     405        2692 :             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
     406        1346 :                             s->mb_x - 1, s->mb_y, ER_MB_END);
     407             : 
     408        1346 :         return 0;
     409             :     }
     410             : 
     411           0 :     av_log(s->avctx, AV_LOG_ERROR,
     412             :            "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
     413             :            get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
     414             : 
     415           0 :     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
     416             :                     ER_MB_END & part_mask);
     417             : 
     418           0 :     return AVERROR_INVALIDDATA;
     419             : }
     420             : 
     421        5771 : int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     422             :                          AVPacket *avpkt)
     423             : {
     424        5771 :     const uint8_t *buf = avpkt->data;
     425        5771 :     int buf_size       = avpkt->size;
     426        5771 :     MpegEncContext *s  = avctx->priv_data;
     427             :     int ret;
     428        5771 :     int slice_ret = 0;
     429        5771 :     AVFrame *pict = data;
     430             : 
     431             :     /* no supplementary picture */
     432        5771 :     if (buf_size == 0) {
     433             :         /* special case for last picture */
     434          99 :         if (s->low_delay == 0 && s->next_picture_ptr) {
     435          24 :             if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
     436           0 :                 return ret;
     437          24 :             s->next_picture_ptr = NULL;
     438             : 
     439          24 :             *got_frame = 1;
     440             :         }
     441             : 
     442          99 :         return 0;
     443             :     }
     444             : 
     445        5672 :     if (s->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
     446             :         int next;
     447             : 
     448           0 :         if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) {
     449           0 :             next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
     450           0 :         } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
     451           0 :             next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
     452           0 :         } else if (CONFIG_H263P_DECODER && s->codec_id == AV_CODEC_ID_H263P) {
     453           0 :             next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
     454             :         } else {
     455           0 :             av_log(s->avctx, AV_LOG_ERROR,
     456             :                    "this codec does not support truncated bitstreams\n");
     457           0 :             return AVERROR(ENOSYS);
     458             :         }
     459             : 
     460           0 :         if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
     461             :                              &buf_size) < 0)
     462           0 :             return buf_size;
     463             :     }
     464             : 
     465        5672 : retry:
     466        5676 :     if (s->divx_packed && s->bitstream_buffer_size) {
     467             :         int i;
     468           7 :         for(i=0; i < buf_size-3; i++) {
     469           7 :             if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) {
     470           7 :                 if (buf[i+3]==0xB0) {
     471           0 :                     av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
     472           0 :                     s->bitstream_buffer_size = 0;
     473             :                 }
     474           7 :                 break;
     475             :             }
     476             :         }
     477             :     }
     478             : 
     479        5676 :     if (s->bitstream_buffer_size && (s->divx_packed || buf_size <= MAX_NVOP_SIZE)) // divx 5.01+/xvid frame reorder
     480           7 :         ret = init_get_bits8(&s->gb, s->bitstream_buffer,
     481             :                              s->bitstream_buffer_size);
     482             :     else
     483        5669 :         ret = init_get_bits8(&s->gb, buf, buf_size);
     484             : 
     485        5676 :     s->bitstream_buffer_size = 0;
     486        5676 :     if (ret < 0)
     487           0 :         return ret;
     488             : 
     489        5676 :     if (!s->context_initialized)
     490             :         // we need the idct permutation for reading a custom matrix
     491         177 :         ff_mpv_idct_init(s);
     492             : 
     493             :     /* let's go :-) */
     494        5676 :     if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
     495         674 :         ret = ff_wmv2_decode_picture_header(s);
     496        5002 :     } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
     497         675 :         ret = ff_msmpeg4_decode_picture_header(s);
     498        4327 :     } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
     499        3452 :         if (s->avctx->extradata_size && s->picture_number == 0) {
     500             :             GetBitContext gb;
     501             : 
     502         155 :             if (init_get_bits8(&gb, s->avctx->extradata, s->avctx->extradata_size) >= 0 )
     503         155 :                 ff_mpeg4_decode_picture_header(avctx->priv_data, &gb);
     504             :         }
     505        3452 :         ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb);
     506         875 :     } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
     507           0 :         ret = ff_intel_h263_decode_picture_header(s);
     508         875 :     } else if (CONFIG_FLV_DECODER && s->h263_flv) {
     509         414 :         ret = ff_flv_decode_picture_header(s);
     510             :     } else {
     511         461 :         ret = ff_h263_decode_picture_header(s);
     512             :     }
     513             : 
     514        5676 :     if (ret < 0 || ret == FRAME_SKIPPED) {
     515           0 :         if (   s->width  != avctx->coded_width
     516           0 :             || s->height != avctx->coded_height) {
     517           0 :                 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
     518           0 :                 s->width = avctx->coded_width;
     519           0 :                 s->height= avctx->coded_height;
     520             :         }
     521             :     }
     522        5676 :     if (ret == FRAME_SKIPPED)
     523           0 :         return get_consumed_bytes(s, buf_size);
     524             : 
     525             :     /* skip if the header was thrashed */
     526        5676 :     if (ret < 0) {
     527           0 :         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
     528           0 :         return ret;
     529             :     }
     530             : 
     531        5676 :     if (!s->context_initialized) {
     532         177 :         avctx->pix_fmt = h263_get_format(avctx);
     533         177 :         if ((ret = ff_mpv_common_init(s)) < 0)
     534           0 :             return ret;
     535             :     }
     536             : 
     537        5676 :     if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) {
     538        5626 :         int i = ff_find_unused_picture(s->avctx, s->picture, 0);
     539        5626 :         if (i < 0)
     540           0 :             return i;
     541        5626 :         s->current_picture_ptr = &s->picture[i];
     542             :     }
     543             : 
     544        5676 :     avctx->has_b_frames = !s->low_delay;
     545             : 
     546        5676 :     if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
     547        3452 :         if (ff_mpeg4_workaround_bugs(avctx) == 1)
     548           4 :             goto retry;
     549             :     }
     550             : 
     551             :     /* After H.263 & MPEG-4 header decode we have the height, width,
     552             :      * and other parameters. So then we could init the picture.
     553             :      * FIXME: By the way H.263 decoder is evolving it should have
     554             :      * an H263EncContext */
     555       11306 :     if (s->width  != avctx->coded_width  ||
     556       11268 :         s->height != avctx->coded_height ||
     557        5634 :         s->context_reinit) {
     558             :         /* H.263 could change picture size any time */
     559          38 :         s->context_reinit = 0;
     560             : 
     561          38 :         ret = ff_set_dimensions(avctx, s->width, s->height);
     562          38 :         if (ret < 0)
     563           0 :             return ret;
     564             : 
     565          38 :         ff_set_sar(avctx, avctx->sample_aspect_ratio);
     566             : 
     567          38 :         if ((ret = ff_mpv_common_frame_size_change(s)))
     568           0 :             return ret;
     569             : 
     570          38 :         if (avctx->pix_fmt != h263_get_format(avctx)) {
     571           0 :             av_log(avctx, AV_LOG_ERROR, "format change not supported\n");
     572           0 :             avctx->pix_fmt = AV_PIX_FMT_NONE;
     573           0 :             return AVERROR_UNKNOWN;
     574             :         }
     575             :     }
     576             : 
     577       10883 :     if (s->codec_id == AV_CODEC_ID_H263  ||
     578       10422 :         s->codec_id == AV_CODEC_ID_H263P ||
     579        5211 :         s->codec_id == AV_CODEC_ID_H263I)
     580         461 :         s->gob_index = H263_GOB_HEIGHT(s->height);
     581             : 
     582             :     // for skipping the frame
     583        5672 :     s->current_picture.f->pict_type = s->pict_type;
     584        5672 :     s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
     585             : 
     586             :     /* skip B-frames if we don't have reference frames */
     587        6020 :     if (!s->last_picture_ptr &&
     588         696 :         (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
     589           0 :         return get_consumed_bytes(s, buf_size);
     590        5834 :     if ((avctx->skip_frame >= AVDISCARD_NONREF &&
     591        5834 :          s->pict_type == AV_PICTURE_TYPE_B)    ||
     592        5834 :         (avctx->skip_frame >= AVDISCARD_NONKEY &&
     593        5787 :          s->pict_type != AV_PICTURE_TYPE_I)    ||
     594        5625 :         avctx->skip_frame >= AVDISCARD_ALL)
     595         159 :         return get_consumed_bytes(s, buf_size);
     596             : 
     597        5513 :     if (s->next_p_frame_damaged) {
     598           0 :         if (s->pict_type == AV_PICTURE_TYPE_B)
     599           0 :             return get_consumed_bytes(s, buf_size);
     600             :         else
     601           0 :             s->next_p_frame_damaged = 0;
     602             :     }
     603             : 
     604        5513 :     if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
     605        3571 :         s->me.qpel_put = s->qdsp.put_qpel_pixels_tab;
     606        3571 :         s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
     607             :     } else {
     608        1942 :         s->me.qpel_put = s->qdsp.put_no_rnd_qpel_pixels_tab;
     609        1942 :         s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
     610             :     }
     611             : 
     612        5513 :     if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
     613           0 :         return ret;
     614             : 
     615        5513 :     if (!s->divx_packed)
     616        5498 :         ff_thread_finish_setup(avctx);
     617             : 
     618        5513 :     if (avctx->hwaccel) {
     619           0 :         ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
     620           0 :                                           s->gb.buffer_end - s->gb.buffer);
     621           0 :         if (ret < 0 )
     622           0 :             return ret;
     623             :     }
     624             : 
     625        5513 :     ff_mpeg_er_frame_start(s);
     626             : 
     627             :     /* the second part of the wmv2 header contains the MB skip bits which
     628             :      * are stored in current_picture->mb_type which is not available before
     629             :      * ff_mpv_frame_start() */
     630        5513 :     if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
     631         674 :         ret = ff_wmv2_decode_secondary_picture_header(s);
     632         674 :         if (ret < 0)
     633           0 :             return ret;
     634         674 :         if (ret == 1)
     635           3 :             goto frame_end;
     636             :     }
     637             : 
     638             :     /* decode each macroblock */
     639        5510 :     s->mb_x = 0;
     640        5510 :     s->mb_y = 0;
     641             : 
     642        5510 :     slice_ret = decode_slice(s);
     643       17431 :     while (s->mb_y < s->mb_height) {
     644        6411 :         if (s->msmpeg4_version) {
     645           0 :             if (s->slice_height == 0 || s->mb_x != 0 || slice_ret < 0 ||
     646           0 :                 (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
     647             :                 break;
     648             :         } else {
     649        6411 :             int prev_x = s->mb_x, prev_y = s->mb_y;
     650        6411 :             if (ff_h263_resync(s) < 0)
     651           0 :                 break;
     652        6411 :             if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
     653          29 :                 s->er.error_occurred = 1;
     654             :         }
     655             : 
     656        6411 :         if (s->msmpeg4_version < 4 && s->h263_pred)
     657        3867 :             ff_mpeg4_clean_buffers(s);
     658             : 
     659        6411 :         if (decode_slice(s) < 0)
     660           0 :             slice_ret = AVERROR_INVALIDDATA;
     661             :     }
     662             : 
     663        7331 :     if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
     664         475 :         s->pict_type == AV_PICTURE_TYPE_I)
     665          44 :         if (!CONFIG_MSMPEG4_DECODER ||
     666          44 :             ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
     667           0 :             s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
     668             : 
     669             :     av_assert1(s->bitstream_buffer_size == 0);
     670       11023 : frame_end:
     671        5513 :     ff_er_frame_end(&s->er);
     672             : 
     673        5513 :     if (avctx->hwaccel) {
     674           0 :         ret = avctx->hwaccel->end_frame(avctx);
     675           0 :         if (ret < 0)
     676           0 :             return ret;
     677             :     }
     678             : 
     679        5513 :     ff_mpv_frame_end(s);
     680             : 
     681        5513 :     if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
     682        3311 :         ff_mpeg4_frame_end(avctx, buf, buf_size);
     683             : 
     684        5513 :     if (!s->divx_packed && avctx->hwaccel)
     685           0 :         ff_thread_finish_setup(avctx);
     686             : 
     687             :     av_assert1(s->current_picture.f->pict_type == s->current_picture_ptr->f->pict_type);
     688             :     av_assert1(s->current_picture.f->pict_type == s->pict_type);
     689        5513 :     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
     690        5126 :         if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
     691           0 :             return ret;
     692        5126 :         ff_print_debug_info(s, s->current_picture_ptr, pict);
     693        5126 :         ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
     694         387 :     } else if (s->last_picture_ptr) {
     695         363 :         if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
     696           0 :             return ret;
     697         363 :         ff_print_debug_info(s, s->last_picture_ptr, pict);
     698         363 :         ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
     699             :     }
     700             : 
     701        5513 :     if (s->last_picture_ptr || s->low_delay) {
     702        5489 :         if (   pict->format == AV_PIX_FMT_YUV420P
     703        5489 :             && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
     704             :             int x, y, p;
     705           0 :             av_frame_make_writable(pict);
     706           0 :             for (p=0; p<3; p++) {
     707           0 :                 int w = AV_CEIL_RSHIFT(pict-> width, !!p);
     708           0 :                 int h = AV_CEIL_RSHIFT(pict->height, !!p);
     709           0 :                 int linesize = pict->linesize[p];
     710           0 :                 for (y=0; y<(h>>1); y++)
     711           0 :                     for (x=0; x<w; x++)
     712           0 :                         FFSWAP(int,
     713             :                                pict->data[p][x + y*linesize],
     714             :                                pict->data[p][x + (h-1-y)*linesize]);
     715             :             }
     716             :         }
     717        5489 :         *got_frame = 1;
     718             :     }
     719             : 
     720        5513 :     if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
     721           0 :         return slice_ret;
     722             :     else
     723        5513 :         return get_consumed_bytes(s, buf_size);
     724             : }
     725             : 
     726             : const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
     727             : #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
     728             :     AV_PIX_FMT_VAAPI,
     729             : #endif
     730             : #if CONFIG_MPEG4_NVDEC_HWACCEL
     731             :     AV_PIX_FMT_CUDA,
     732             : #endif
     733             : #if CONFIG_MPEG4_VDPAU_HWACCEL
     734             :     AV_PIX_FMT_VDPAU,
     735             : #endif
     736             : #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL || CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
     737             :     AV_PIX_FMT_VIDEOTOOLBOX,
     738             : #endif
     739             :     AV_PIX_FMT_YUV420P,
     740             :     AV_PIX_FMT_NONE
     741             : };
     742             : 
     743             : AVCodec ff_h263_decoder = {
     744             :     .name           = "h263",
     745             :     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
     746             :     .type           = AVMEDIA_TYPE_VIDEO,
     747             :     .id             = AV_CODEC_ID_H263,
     748             :     .priv_data_size = sizeof(MpegEncContext),
     749             :     .init           = ff_h263_decode_init,
     750             :     .close          = ff_h263_decode_end,
     751             :     .decode         = ff_h263_decode_frame,
     752             :     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
     753             :                       AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY,
     754             :     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
     755             :     .flush          = ff_mpeg_flush,
     756             :     .max_lowres     = 3,
     757             :     .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
     758             : };
     759             : 
     760             : AVCodec ff_h263p_decoder = {
     761             :     .name           = "h263p",
     762             :     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
     763             :     .type           = AVMEDIA_TYPE_VIDEO,
     764             :     .id             = AV_CODEC_ID_H263P,
     765             :     .priv_data_size = sizeof(MpegEncContext),
     766             :     .init           = ff_h263_decode_init,
     767             :     .close          = ff_h263_decode_end,
     768             :     .decode         = ff_h263_decode_frame,
     769             :     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
     770             :                       AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY,
     771             :     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
     772             :     .flush          = ff_mpeg_flush,
     773             :     .max_lowres     = 3,
     774             :     .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
     775             :     .hw_configs     = (const AVCodecHWConfigInternal*[]) {
     776             : #if CONFIG_H263_VAAPI_HWACCEL
     777             :                         HWACCEL_VAAPI(h263),
     778             : #endif
     779             : #if CONFIG_MPEG4_VDPAU_HWACCEL
     780             :                         HWACCEL_VDPAU(mpeg4),
     781             : #endif
     782             : #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL
     783             :                         HWACCEL_VIDEOTOOLBOX(h263),
     784             : #endif
     785             :                         NULL
     786             :                     },
     787             : };

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