Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

  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 "internal.h"
  37. #include "mpeg4video.h"
  38. #include "mpeg4video_parser.h"
  39. #include "mpegvideo.h"
  40. #include "msmpeg4.h"
  41. #include "vdpau_internal.h"
  42. #include "thread.h"
  43.  
  44. av_cold int ff_h263_decode_init(AVCodecContext *avctx)
  45. {
  46.     MpegEncContext *s = avctx->priv_data;
  47.     int ret;
  48.  
  49.     s->avctx           = avctx;
  50.     s->out_format      = FMT_H263;
  51.     s->width           = avctx->coded_width;
  52.     s->height          = avctx->coded_height;
  53.     s->workaround_bugs = avctx->workaround_bugs;
  54.  
  55.     // set defaults
  56.     ff_MPV_decode_defaults(s);
  57.     s->quant_precision = 5;
  58.     s->decode_mb       = ff_h263_decode_mb;
  59.     s->low_delay       = 1;
  60.     if (avctx->codec->id == AV_CODEC_ID_MSS2)
  61.         avctx->pix_fmt = AV_PIX_FMT_YUV420P;
  62.     else
  63.         avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
  64.     s->unrestricted_mv = 1;
  65.  
  66.     /* select sub codec */
  67.     switch (avctx->codec->id) {
  68.     case AV_CODEC_ID_H263:
  69.     case AV_CODEC_ID_H263P:
  70.         s->unrestricted_mv = 0;
  71.         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
  72.         break;
  73.     case AV_CODEC_ID_MPEG4:
  74.         break;
  75.     case AV_CODEC_ID_MSMPEG4V1:
  76.         s->h263_pred       = 1;
  77.         s->msmpeg4_version = 1;
  78.         break;
  79.     case AV_CODEC_ID_MSMPEG4V2:
  80.         s->h263_pred       = 1;
  81.         s->msmpeg4_version = 2;
  82.         break;
  83.     case AV_CODEC_ID_MSMPEG4V3:
  84.         s->h263_pred       = 1;
  85.         s->msmpeg4_version = 3;
  86.         break;
  87.     case AV_CODEC_ID_WMV1:
  88.         s->h263_pred       = 1;
  89.         s->msmpeg4_version = 4;
  90.         break;
  91.     case AV_CODEC_ID_WMV2:
  92.         s->h263_pred       = 1;
  93.         s->msmpeg4_version = 5;
  94.         break;
  95.     case AV_CODEC_ID_VC1:
  96.     case AV_CODEC_ID_WMV3:
  97.     case AV_CODEC_ID_VC1IMAGE:
  98.     case AV_CODEC_ID_WMV3IMAGE:
  99.     case AV_CODEC_ID_MSS2:
  100.         s->h263_pred       = 1;
  101.         s->msmpeg4_version = 6;
  102.         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
  103.         break;
  104.     case AV_CODEC_ID_H263I:
  105.         break;
  106.     case AV_CODEC_ID_FLV1:
  107.         s->h263_flv = 1;
  108.         break;
  109.     default:
  110.         return AVERROR(EINVAL);
  111.     }
  112.     s->codec_id    = avctx->codec->id;
  113.     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
  114.  
  115.     if (avctx->stream_codec_tag == AV_RL32("l263") && avctx->extradata_size == 56 && avctx->extradata[0] == 1)
  116.         s->ehc_mode = 1;
  117.  
  118.     /* for h263, we allocate the images after having read the header */
  119.     if (avctx->codec->id != AV_CODEC_ID_H263 &&
  120.         avctx->codec->id != AV_CODEC_ID_H263P &&
  121.         avctx->codec->id != AV_CODEC_ID_MPEG4)
  122.         if ((ret = ff_MPV_common_init(s)) < 0)
  123.             return ret;
  124.  
  125.     ff_h263_decode_init_vlc();
  126.  
  127.     return 0;
  128. }
  129.  
  130. av_cold int ff_h263_decode_end(AVCodecContext *avctx)
  131. {
  132.     MpegEncContext *s = avctx->priv_data;
  133.  
  134.     ff_MPV_common_end(s);
  135.     return 0;
  136. }
  137.  
  138. /**
  139.  * Return the number of bytes consumed for building the current frame.
  140.  */
  141. static int get_consumed_bytes(MpegEncContext *s, int buf_size)
  142. {
  143.     int pos = (get_bits_count(&s->gb) + 7) >> 3;
  144.  
  145.     if (s->divx_packed || s->avctx->hwaccel) {
  146.         /* We would have to scan through the whole buf to handle the weird
  147.          * reordering ... */
  148.         return buf_size;
  149.     } else if (s->flags & CODEC_FLAG_TRUNCATED) {
  150.         pos -= s->parse_context.last_index;
  151.         // padding is not really read so this might be -1
  152.         if (pos < 0)
  153.             pos = 0;
  154.         return pos;
  155.     } else {
  156.         // avoid infinite loops (maybe not needed...)
  157.         if (pos == 0)
  158.             pos = 1;
  159.         // oops ;)
  160.         if (pos + 10 > buf_size)
  161.             pos = buf_size;
  162.  
  163.         return pos;
  164.     }
  165. }
  166.  
  167. static int decode_slice(MpegEncContext *s)
  168. {
  169.     const int part_mask = s->partitioned_frame ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
  170.     const int mb_size   = 16 >> s->avctx->lowres;
  171.     int ret;
  172.  
  173.     s->last_resync_gb   = s->gb;
  174.     s->first_slice_line = 1;
  175.     s->resync_mb_x      = s->mb_x;
  176.     s->resync_mb_y      = s->mb_y;
  177.  
  178.     ff_set_qscale(s, s->qscale);
  179.  
  180.     if (s->avctx->hwaccel) {
  181.         const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
  182.         ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start);
  183.         // ensure we exit decode loop
  184.         s->mb_y = s->mb_height;
  185.         return ret;
  186.     }
  187.  
  188.     if (s->partitioned_frame) {
  189.         const int qscale = s->qscale;
  190.  
  191.         if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
  192.             if ((ret = ff_mpeg4_decode_partitions(s)) < 0)
  193.                 return ret;
  194.  
  195.         /* restore variables which were modified */
  196.         s->first_slice_line = 1;
  197.         s->mb_x             = s->resync_mb_x;
  198.         s->mb_y             = s->resync_mb_y;
  199.         ff_set_qscale(s, qscale);
  200.     }
  201.  
  202.     for (; s->mb_y < s->mb_height; s->mb_y++) {
  203.         /* per-row end of slice checks */
  204.         if (s->msmpeg4_version) {
  205.             if (s->resync_mb_y + s->slice_height == s->mb_y) {
  206.                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
  207.                                 s->mb_x - 1, s->mb_y, ER_MB_END);
  208.  
  209.                 return 0;
  210.             }
  211.         }
  212.  
  213.         if (s->msmpeg4_version == 1) {
  214.             s->last_dc[0] =
  215.             s->last_dc[1] =
  216.             s->last_dc[2] = 128;
  217.         }
  218.  
  219.         ff_init_block_index(s);
  220.         for (; s->mb_x < s->mb_width; s->mb_x++) {
  221.             int ret;
  222.  
  223.             ff_update_block_index(s);
  224.  
  225.             if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
  226.                 s->first_slice_line = 0;
  227.  
  228.             /* DCT & quantize */
  229.  
  230.             s->mv_dir  = MV_DIR_FORWARD;
  231.             s->mv_type = MV_TYPE_16X16;
  232. //            s->mb_skipped = 0;
  233.             av_dlog(s, "%d %d %06X\n",
  234.                     ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
  235.             ret = s->decode_mb(s, s->block);
  236.  
  237.             if (s->pict_type != AV_PICTURE_TYPE_B)
  238.                 ff_h263_update_motion_val(s);
  239.  
  240.             if (ret < 0) {
  241.                 const int xy = s->mb_x + s->mb_y * s->mb_stride;
  242.                 if (ret == SLICE_END) {
  243.                     ff_MPV_decode_mb(s, s->block);
  244.                     if (s->loop_filter)
  245.                         ff_h263_loop_filter(s);
  246.  
  247.                     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
  248.                                     s->mb_x, s->mb_y, ER_MB_END & part_mask);
  249.  
  250.                     s->padding_bug_score--;
  251.  
  252.                     if (++s->mb_x >= s->mb_width) {
  253.                         s->mb_x = 0;
  254.                         ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
  255.                         ff_MPV_report_decode_progress(s);
  256.                         s->mb_y++;
  257.                     }
  258.                     return 0;
  259.                 } else if (ret == SLICE_NOEND) {
  260.                     av_log(s->avctx, AV_LOG_ERROR,
  261.                            "Slice mismatch at MB: %d\n", xy);
  262.                     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
  263.                                     s->mb_x + 1, s->mb_y,
  264.                                     ER_MB_END & part_mask);
  265.                     return AVERROR_INVALIDDATA;
  266.                 }
  267.                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
  268.                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
  269.                                 s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
  270.  
  271.                 return AVERROR_INVALIDDATA;
  272.             }
  273.  
  274.             ff_MPV_decode_mb(s, s->block);
  275.             if (s->loop_filter)
  276.                 ff_h263_loop_filter(s);
  277.         }
  278.  
  279.         ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
  280.         ff_MPV_report_decode_progress(s);
  281.  
  282.         s->mb_x = 0;
  283.     }
  284.  
  285.     av_assert1(s->mb_x == 0 && s->mb_y == s->mb_height);
  286.  
  287.     if (s->codec_id == AV_CODEC_ID_MPEG4         &&
  288.         (s->workaround_bugs & FF_BUG_AUTODETECT) &&
  289.         get_bits_left(&s->gb) >= 48              &&
  290.         show_bits(&s->gb, 24) == 0x4010          &&
  291.         !s->data_partitioning)
  292.         s->padding_bug_score += 32;
  293.  
  294.     /* try to detect the padding bug */
  295.     if (s->codec_id == AV_CODEC_ID_MPEG4         &&
  296.         (s->workaround_bugs & FF_BUG_AUTODETECT) &&
  297.         get_bits_left(&s->gb) >= 0               &&
  298.         get_bits_left(&s->gb) < 137              &&
  299.         // !s->resync_marker                     &&
  300.         !s->data_partitioning) {
  301.         const int bits_count = get_bits_count(&s->gb);
  302.         const int bits_left  = s->gb.size_in_bits - bits_count;
  303.  
  304.         if (bits_left == 0) {
  305.             s->padding_bug_score += 16;
  306.         } else if (bits_left != 1) {
  307.             int v = show_bits(&s->gb, 8);
  308.             v |= 0x7F >> (7 - (bits_count & 7));
  309.  
  310.             if (v == 0x7F && bits_left <= 8)
  311.                 s->padding_bug_score--;
  312.             else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
  313.                      bits_left <= 16)
  314.                 s->padding_bug_score += 4;
  315.             else
  316.                 s->padding_bug_score++;
  317.         }
  318.     }
  319.  
  320.     if (s->workaround_bugs & FF_BUG_AUTODETECT) {
  321.         if (s->padding_bug_score > -2 && !s->data_partitioning
  322.             /* && (s->divx_version >= 0 || !s->resync_marker) */)
  323.             s->workaround_bugs |= FF_BUG_NO_PADDING;
  324.         else
  325.             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
  326.     }
  327.  
  328.     // handle formats which don't have unique end markers
  329.     if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
  330.         int left      = get_bits_left(&s->gb);
  331.         int max_extra = 7;
  332.  
  333.         /* no markers in M$ crap */
  334.         if (s->msmpeg4_version && s->pict_type == AV_PICTURE_TYPE_I)
  335.             max_extra += 17;
  336.  
  337.         /* buggy padding but the frame should still end approximately at
  338.          * the bitstream end */
  339.         if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
  340.             (s->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
  341.             max_extra += 48;
  342.         else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
  343.             max_extra += 256 * 256 * 256 * 64;
  344.  
  345.         if (left > max_extra)
  346.             av_log(s->avctx, AV_LOG_ERROR,
  347.                    "discarding %d junk bits at end, next would be %X\n",
  348.                    left, show_bits(&s->gb, 24));
  349.         else if (left < 0)
  350.             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
  351.         else
  352.             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
  353.                             s->mb_x - 1, s->mb_y, ER_MB_END);
  354.  
  355.         return 0;
  356.     }
  357.  
  358.     av_log(s->avctx, AV_LOG_ERROR,
  359.            "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
  360.            get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
  361.  
  362.     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
  363.                     ER_MB_END & part_mask);
  364.  
  365.     return AVERROR_INVALIDDATA;
  366. }
  367.  
  368. int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
  369.                          AVPacket *avpkt)
  370. {
  371.     const uint8_t *buf = avpkt->data;
  372.     int buf_size       = avpkt->size;
  373.     MpegEncContext *s  = avctx->priv_data;
  374.     int ret;
  375.     AVFrame *pict = data;
  376.  
  377.     s->flags  = avctx->flags;
  378.     s->flags2 = avctx->flags2;
  379.  
  380.     /* no supplementary picture */
  381.     if (buf_size == 0) {
  382.         /* special case for last picture */
  383.         if (s->low_delay == 0 && s->next_picture_ptr) {
  384.             if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)
  385.                 return ret;
  386.             s->next_picture_ptr = NULL;
  387.  
  388.             *got_frame = 1;
  389.         }
  390.  
  391.         return 0;
  392.     }
  393.  
  394.     if (s->flags & CODEC_FLAG_TRUNCATED) {
  395.         int next;
  396.  
  397.         if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) {
  398.             next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
  399.         } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
  400.             next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
  401.         } else if (CONFIG_H263P_DECODER && s->codec_id == AV_CODEC_ID_H263P) {
  402.             next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
  403.         } else {
  404.             av_log(s->avctx, AV_LOG_ERROR,
  405.                    "this codec does not support truncated bitstreams\n");
  406.             return AVERROR(EINVAL);
  407.         }
  408.  
  409.         if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
  410.                              &buf_size) < 0)
  411.             return buf_size;
  412.     }
  413.  
  414. retry:
  415.     if (s->divx_packed && s->bitstream_buffer_size) {
  416.         int i;
  417.         for(i=0; i < buf_size-3; i++) {
  418.             if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) {
  419.                 if (buf[i+3]==0xB0) {
  420.                     av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
  421.                     s->bitstream_buffer_size = 0;
  422.                 }
  423.                 break;
  424.             }
  425.         }
  426.     }
  427.  
  428.     if (s->bitstream_buffer_size && (s->divx_packed || buf_size < 20)) // divx 5.01+/xvid frame reorder
  429.         ret = init_get_bits8(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size);
  430.     else
  431.         ret = init_get_bits8(&s->gb, buf, buf_size);
  432.  
  433.     s->bitstream_buffer_size = 0;
  434.     if (ret < 0)
  435.         return ret;
  436.  
  437.     if (!s->context_initialized)
  438.         if ((ret = ff_MPV_common_init(s)) < 0) // we need the idct permutaton for reading a custom matrix
  439.             return ret;
  440.  
  441.     /* We need to set current_picture_ptr before reading the header,
  442.      * otherwise we cannot store anyting in there */
  443.     if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
  444.         int i = ff_find_unused_picture(s, 0);
  445.         if (i < 0)
  446.             return i;
  447.         s->current_picture_ptr = &s->picture[i];
  448.     }
  449.  
  450.     /* let's go :-) */
  451.     if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
  452.         ret = ff_wmv2_decode_picture_header(s);
  453.     } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
  454.         ret = ff_msmpeg4_decode_picture_header(s);
  455.     } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
  456.         if (s->avctx->extradata_size && s->picture_number == 0) {
  457.             GetBitContext gb;
  458.  
  459.             if (init_get_bits8(&gb, s->avctx->extradata, s->avctx->extradata_size) >= 0 )
  460.                 ret = ff_mpeg4_decode_picture_header(s, &gb);
  461.         }
  462.         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
  463.     } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
  464.         ret = ff_intel_h263_decode_picture_header(s);
  465.     } else if (CONFIG_FLV_DECODER && s->h263_flv) {
  466.         ret = ff_flv_decode_picture_header(s);
  467.     } else {
  468.         ret = ff_h263_decode_picture_header(s);
  469.     }
  470.  
  471.     if (ret < 0 || ret == FRAME_SKIPPED) {
  472.         if (   s->width  != avctx->coded_width
  473.             || s->height != avctx->coded_height) {
  474.                 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
  475.                 s->width = avctx->coded_width;
  476.                 s->height= avctx->coded_height;
  477.         }
  478.     }
  479.     if (ret == FRAME_SKIPPED)
  480.         return get_consumed_bytes(s, buf_size);
  481.  
  482.     /* skip if the header was thrashed */
  483.     if (ret < 0) {
  484.         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
  485.         return ret;
  486.     }
  487.  
  488.     avctx->has_b_frames = !s->low_delay;
  489.  
  490.     if (s->xvid_build == -1 && s->divx_version == -1 && s->lavc_build == -1) {
  491.         if (s->stream_codec_tag == AV_RL32("XVID") ||
  492.             s->codec_tag        == AV_RL32("XVID") ||
  493.             s->codec_tag        == AV_RL32("XVIX") ||
  494.             s->codec_tag        == AV_RL32("RMP4") ||
  495.             s->codec_tag        == AV_RL32("ZMP4") ||
  496.             s->codec_tag        == AV_RL32("SIPP"))
  497.             s->xvid_build = 0;
  498. #if 0
  499.         if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
  500.             s->vol_control_parameters == 1 &&
  501.             s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
  502.             s->xvid_build = 0;
  503. #endif
  504.     }
  505.  
  506.     if (s->xvid_build == -1 && s->divx_version == -1 && s->lavc_build == -1)
  507.         if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
  508.             s->vol_control_parameters == 0)
  509.             s->divx_version = 400;  // divx 4
  510.  
  511.     if (s->xvid_build >= 0 && s->divx_version >= 0) {
  512.         s->divx_version =
  513.         s->divx_build   = -1;
  514.     }
  515.  
  516.     if (s->workaround_bugs & FF_BUG_AUTODETECT) {
  517.         if (s->codec_tag == AV_RL32("XVIX"))
  518.             s->workaround_bugs |= FF_BUG_XVID_ILACE;
  519.  
  520.         if (s->codec_tag == AV_RL32("UMP4"))
  521.             s->workaround_bugs |= FF_BUG_UMP4;
  522.  
  523.         if (s->divx_version >= 500 && s->divx_build < 1814)
  524.             s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
  525.  
  526.         if (s->divx_version > 502 && s->divx_build < 1814)
  527.             s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
  528.  
  529.         if (s->xvid_build <= 3U)
  530.             s->padding_bug_score = 256 * 256 * 256 * 64;
  531.  
  532.         if (s->xvid_build <= 1U)
  533.             s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
  534.  
  535.         if (s->xvid_build <= 12U)
  536.             s->workaround_bugs |= FF_BUG_EDGE;
  537.  
  538.         if (s->xvid_build <= 32U)
  539.             s->workaround_bugs |= FF_BUG_DC_CLIP;
  540.  
  541. #define SET_QPEL_FUNC(postfix1, postfix2)                           \
  542.     s->dsp.put_        ## postfix1 = ff_put_        ## postfix2;    \
  543.     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;    \
  544.     s->dsp.avg_        ## postfix1 = ff_avg_        ## postfix2;
  545.  
  546.         if (s->lavc_build < 4653U)
  547.             s->workaround_bugs |= FF_BUG_STD_QPEL;
  548.  
  549.         if (s->lavc_build < 4655U)
  550.             s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
  551.  
  552.         if (s->lavc_build < 4670U)
  553.             s->workaround_bugs |= FF_BUG_EDGE;
  554.  
  555.         if (s->lavc_build <= 4712U)
  556.             s->workaround_bugs |= FF_BUG_DC_CLIP;
  557.  
  558.         if (s->divx_version >= 0)
  559.             s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
  560.         if (s->divx_version == 501 && s->divx_build == 20020416)
  561.             s->padding_bug_score = 256 * 256 * 256 * 64;
  562.  
  563.         if (s->divx_version < 500U)
  564.             s->workaround_bugs |= FF_BUG_EDGE;
  565.  
  566.         if (s->divx_version >= 0)
  567.             s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
  568. #if 0
  569.         if (s->divx_version == 500)
  570.             s->padding_bug_score = 256 * 256 * 256 * 64;
  571.  
  572.         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
  573.          * Let us hope this at least works. */
  574.         if (s->resync_marker == 0 && s->data_partitioning == 0        &&
  575.             s->divx_version == -1 && s->codec_id == AV_CODEC_ID_MPEG4 &&
  576.             s->vo_type == 0)
  577.             s->workaround_bugs |= FF_BUG_NO_PADDING;
  578.  
  579.         // FIXME not sure about the version num but a 4609 file seems ok
  580.         if (s->lavc_build < 4609U)
  581.             s->workaround_bugs |= FF_BUG_NO_PADDING;
  582. #endif
  583.     }
  584.  
  585.     if (s->workaround_bugs & FF_BUG_STD_QPEL) {
  586.         SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
  587.         SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
  588.         SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
  589.         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
  590.         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
  591.         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
  592.  
  593.         SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
  594.         SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
  595.         SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
  596.         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
  597.         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
  598.         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
  599.     }
  600.  
  601.     if (avctx->debug & FF_DEBUG_BUGS)
  602.         av_log(s->avctx, AV_LOG_DEBUG,
  603.                "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
  604.                s->workaround_bugs, s->lavc_build, s->xvid_build,
  605.                s->divx_version, s->divx_build, s->divx_packed ? "p" : "");
  606.  
  607. #if HAVE_MMX
  608.     if (s->codec_id == AV_CODEC_ID_MPEG4 && s->xvid_build >= 0 &&
  609.         avctx->idct_algo == FF_IDCT_AUTO &&
  610.         (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) {
  611.         avctx->idct_algo = FF_IDCT_XVIDMMX;
  612.         ff_dct_common_init(s);
  613.         goto retry;
  614.     }
  615. #endif
  616.  
  617.     /* After H263 & mpeg4 header decode we have the height, width,
  618.      * and other parameters. So then we could init the picture.
  619.      * FIXME: By the way H263 decoder is evolving it should have
  620.      * an H263EncContext */
  621.     if (s->width  != avctx->coded_width  ||
  622.         s->height != avctx->coded_height ||
  623.         s->context_reinit) {
  624.         /* H.263 could change picture size any time */
  625.         s->context_reinit = 0;
  626.  
  627.         avcodec_set_dimensions(avctx, s->width, s->height);
  628.  
  629.         if ((ret = ff_MPV_common_frame_size_change(s)))
  630.             return ret;
  631.     }
  632.  
  633.     if (s->codec_id == AV_CODEC_ID_H263  ||
  634.         s->codec_id == AV_CODEC_ID_H263P ||
  635.         s->codec_id == AV_CODEC_ID_H263I)
  636.         s->gob_index = ff_h263_get_gob_height(s);
  637.  
  638.     // for skipping the frame
  639.     s->current_picture.f.pict_type = s->pict_type;
  640.     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
  641.  
  642.     /* skip B-frames if we don't have reference frames */
  643.     if (s->last_picture_ptr == NULL &&
  644.         (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
  645.         return get_consumed_bytes(s, buf_size);
  646.     if ((avctx->skip_frame >= AVDISCARD_NONREF &&
  647.          s->pict_type == AV_PICTURE_TYPE_B)    ||
  648.         (avctx->skip_frame >= AVDISCARD_NONKEY &&
  649.          s->pict_type != AV_PICTURE_TYPE_I)    ||
  650.         avctx->skip_frame >= AVDISCARD_ALL)
  651.         return get_consumed_bytes(s, buf_size);
  652.  
  653.     if (s->next_p_frame_damaged) {
  654.         if (s->pict_type == AV_PICTURE_TYPE_B)
  655.             return get_consumed_bytes(s, buf_size);
  656.         else
  657.             s->next_p_frame_damaged = 0;
  658.     }
  659.  
  660.     if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
  661.         s->me.qpel_put = s->dsp.put_qpel_pixels_tab;
  662.         s->me.qpel_avg = s->dsp.avg_qpel_pixels_tab;
  663.     } else {
  664.         s->me.qpel_put = s->dsp.put_no_rnd_qpel_pixels_tab;
  665.         s->me.qpel_avg = s->dsp.avg_qpel_pixels_tab;
  666.     }
  667.  
  668.     if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
  669.         return ret;
  670.  
  671.     if (!s->divx_packed && !avctx->hwaccel)
  672.         ff_thread_finish_setup(avctx);
  673.  
  674.     if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
  675.         ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
  676.         goto frame_end;
  677.     }
  678.  
  679.     if (avctx->hwaccel)
  680.         if ((ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
  681.                                                s->gb.buffer_end - s->gb.buffer)) < 0)
  682.             return ret;
  683.  
  684.     ff_mpeg_er_frame_start(s);
  685.  
  686.     /* the second part of the wmv2 header contains the MB skip bits which
  687.      * are stored in current_picture->mb_type which is not available before
  688.      * ff_MPV_frame_start() */
  689.     if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
  690.         ret = ff_wmv2_decode_secondary_picture_header(s);
  691.         if (ret < 0)
  692.             return ret;
  693.         if (ret == 1)
  694.             goto frame_end;
  695.     }
  696.  
  697.     /* decode each macroblock */
  698.     s->mb_x = 0;
  699.     s->mb_y = 0;
  700.  
  701.     ret = decode_slice(s);
  702.     while (s->mb_y < s->mb_height) {
  703.         if (s->msmpeg4_version) {
  704.             if (s->slice_height == 0 || s->mb_x != 0 ||
  705.                 (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
  706.                 break;
  707.         } else {
  708.             int prev_x = s->mb_x, prev_y = s->mb_y;
  709.             if (ff_h263_resync(s) < 0)
  710.                 break;
  711.             if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
  712.                 s->er.error_occurred = 1;
  713.         }
  714.  
  715.         if (s->msmpeg4_version < 4 && s->h263_pred)
  716.             ff_mpeg4_clean_buffers(s);
  717.  
  718.         if (decode_slice(s) < 0)
  719.             ret = AVERROR_INVALIDDATA;
  720.     }
  721.  
  722.     if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
  723.         s->pict_type == AV_PICTURE_TYPE_I)
  724.         if (!CONFIG_MSMPEG4_DECODER ||
  725.             ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
  726.             s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
  727.  
  728.     av_assert1(s->bitstream_buffer_size == 0);
  729. frame_end:
  730.     ff_er_frame_end(&s->er);
  731.  
  732.     if (avctx->hwaccel)
  733.         if ((ret = avctx->hwaccel->end_frame(avctx)) < 0)
  734.             return ret;
  735.  
  736.     ff_MPV_frame_end(s);
  737.  
  738.     /* divx 5.01+ bitstream reorder stuff */
  739.     /* Since this clobbers the input buffer and hwaccel codecs still need the
  740.      * data during hwaccel->end_frame we should not do this any earlier */
  741.     if (s->codec_id == AV_CODEC_ID_MPEG4 && s->divx_packed) {
  742.         int current_pos     = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
  743.         int startcode_found = 0;
  744.  
  745.         if (buf_size - current_pos > 7) {
  746.             int i;
  747.             for (i = current_pos; i < buf_size - 4; i++)
  748.                 if (buf[i]     == 0 &&
  749.                     buf[i + 1] == 0 &&
  750.                     buf[i + 2] == 1 &&
  751.                     buf[i + 3] == 0xB6) {
  752.                     startcode_found = !(buf[i + 4] & 0x40);
  753.                     break;
  754.                 }
  755.         }
  756.  
  757.         if (startcode_found) {
  758.             av_fast_malloc(&s->bitstream_buffer,
  759.                            &s->allocated_bitstream_buffer_size,
  760.                            buf_size - current_pos +
  761.                            FF_INPUT_BUFFER_PADDING_SIZE);
  762.             if (!s->bitstream_buffer)
  763.                 return AVERROR(ENOMEM);
  764.             memcpy(s->bitstream_buffer, buf + current_pos,
  765.                    buf_size - current_pos);
  766.             s->bitstream_buffer_size = buf_size - current_pos;
  767.         }
  768.     }
  769.  
  770.     if (!s->divx_packed && avctx->hwaccel)
  771.         ff_thread_finish_setup(avctx);
  772.  
  773.     av_assert1(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
  774.     av_assert1(s->current_picture.f.pict_type == s->pict_type);
  775.     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
  776.         if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)
  777.             return ret;
  778.         ff_print_debug_info(s, s->current_picture_ptr, pict);
  779.         ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
  780.     } else if (s->last_picture_ptr != NULL) {
  781.         if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)
  782.             return ret;
  783.         ff_print_debug_info(s, s->last_picture_ptr, pict);
  784.         ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
  785.     }
  786.  
  787.     if (s->last_picture_ptr || s->low_delay) {
  788.         if (   pict->format == AV_PIX_FMT_YUV420P
  789.             && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
  790.             int x, y, p;
  791.             av_frame_make_writable(pict);
  792.             for (p=0; p<3; p++) {
  793.                 int w = FF_CEIL_RSHIFT(pict-> width, !!p);
  794.                 int h = FF_CEIL_RSHIFT(pict->height, !!p);
  795.                 int linesize = pict->linesize[p];
  796.                 for (y=0; y<(h>>1); y++)
  797.                     for (x=0; x<w; x++)
  798.                         FFSWAP(int,
  799.                                pict->data[p][x + y*linesize],
  800.                                pict->data[p][x + (h-1-y)*linesize]);
  801.             }
  802.         }
  803.         *got_frame = 1;
  804.     }
  805.  
  806.     if (ret && (avctx->err_recognition & AV_EF_EXPLODE))
  807.         return ret;
  808.     else
  809.         return get_consumed_bytes(s, buf_size);
  810. }
  811.  
  812. const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
  813. #if CONFIG_VAAPI
  814.     AV_PIX_FMT_VAAPI_VLD,
  815. #endif
  816. #if CONFIG_VDPAU
  817.     AV_PIX_FMT_VDPAU,
  818. #endif
  819.     AV_PIX_FMT_YUV420P,
  820.     AV_PIX_FMT_NONE
  821. };
  822.  
  823. AVCodec ff_h263_decoder = {
  824.     .name           = "h263",
  825.     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
  826.     .type           = AVMEDIA_TYPE_VIDEO,
  827.     .id             = AV_CODEC_ID_H263,
  828.     .priv_data_size = sizeof(MpegEncContext),
  829.     .init           = ff_h263_decode_init,
  830.     .close          = ff_h263_decode_end,
  831.     .decode         = ff_h263_decode_frame,
  832.     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
  833.                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
  834.     .flush          = ff_mpeg_flush,
  835.     .max_lowres     = 3,
  836.     .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
  837. };
  838.  
  839. AVCodec ff_h263p_decoder = {
  840.     .name           = "h263p",
  841.     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
  842.     .type           = AVMEDIA_TYPE_VIDEO,
  843.     .id             = AV_CODEC_ID_H263P,
  844.     .priv_data_size = sizeof(MpegEncContext),
  845.     .init           = ff_h263_decode_init,
  846.     .close          = ff_h263_decode_end,
  847.     .decode         = ff_h263_decode_frame,
  848.     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
  849.                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
  850.     .flush          = ff_mpeg_flush,
  851.     .max_lowres     = 3,
  852.     .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
  853. };
  854.