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  1. /*
  2.  * Copyright (C) 2008  David Conrad
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include "libavcodec/get_bits.h"
  22. #include "libavcodec/dirac.h"
  23. #include "avformat.h"
  24. #include "internal.h"
  25. #include "oggdec.h"
  26.  
  27. static int dirac_header(AVFormatContext *s, int idx)
  28. {
  29.     struct ogg *ogg = s->priv_data;
  30.     struct ogg_stream *os = ogg->streams + idx;
  31.     AVStream *st = s->streams[idx];
  32.     dirac_source_params source;
  33.     GetBitContext gb;
  34.     int ret;
  35.  
  36.     // already parsed the header
  37.     if (st->codec->codec_id == AV_CODEC_ID_DIRAC)
  38.         return 0;
  39.  
  40.     ret = init_get_bits8(&gb, os->buf + os->pstart + 13, (os->psize - 13));
  41.     if (ret < 0)
  42.         return ret;
  43.  
  44.     ret = avpriv_dirac_parse_sequence_header(st->codec, &gb, &source);
  45.     if (ret < 0)
  46.         return ret;
  47.  
  48.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  49.     st->codec->codec_id = AV_CODEC_ID_DIRAC;
  50.     // dirac in ogg always stores timestamps as though the video were interlaced
  51.     avpriv_set_pts_info(st, 64, st->codec->framerate.den, 2*st->codec->framerate.num);
  52.     return 1;
  53. }
  54.  
  55. // various undocument things: granule is signed (only for dirac!)
  56. static uint64_t dirac_gptopts(AVFormatContext *s, int idx, uint64_t granule,
  57.                               int64_t *dts_out)
  58. {
  59.     int64_t gp = granule;
  60.     struct ogg *ogg = s->priv_data;
  61.     struct ogg_stream *os = ogg->streams + idx;
  62.  
  63.     unsigned dist  = ((gp >> 14) & 0xff00) | (gp & 0xff);
  64.     int64_t  dts   = (gp >> 31);
  65.     int64_t  pts   = dts + ((gp >> 9) & 0x1fff);
  66.  
  67.     if (!dist)
  68.         os->pflags |= AV_PKT_FLAG_KEY;
  69.  
  70.     if (dts_out)
  71.         *dts_out = dts;
  72.  
  73.     return pts;
  74. }
  75.  
  76. static int old_dirac_header(AVFormatContext *s, int idx)
  77. {
  78.     struct ogg *ogg = s->priv_data;
  79.     struct ogg_stream *os = ogg->streams + idx;
  80.     AVStream *st = s->streams[idx];
  81.     uint8_t *buf = os->buf + os->pstart;
  82.  
  83.     if (buf[0] != 'K')
  84.         return 0;
  85.  
  86.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  87.     st->codec->codec_id = AV_CODEC_ID_DIRAC;
  88.     avpriv_set_pts_info(st, 64, AV_RB32(buf+12), AV_RB32(buf+8));
  89.     return 1;
  90. }
  91.  
  92. static uint64_t old_dirac_gptopts(AVFormatContext *s, int idx, uint64_t gp,
  93.                                   int64_t *dts)
  94. {
  95.     struct ogg *ogg = s->priv_data;
  96.     struct ogg_stream *os = ogg->streams + idx;
  97.     uint64_t iframe = gp >> 30;
  98.     uint64_t pframe = gp & 0x3fffffff;
  99.  
  100.     if (!pframe)
  101.         os->pflags |= AV_PKT_FLAG_KEY;
  102.  
  103.     return iframe + pframe;
  104. }
  105.  
  106. const struct ogg_codec ff_dirac_codec = {
  107.     .magic = "BBCD\0",
  108.     .magicsize = 5,
  109.     .header = dirac_header,
  110.     .gptopts = dirac_gptopts,
  111.     .granule_is_start = 1,
  112.     .nb_header = 1,
  113. };
  114.  
  115. const struct ogg_codec ff_old_dirac_codec = {
  116.     .magic = "KW-DIRAC",
  117.     .magicsize = 8,
  118.     .header = old_dirac_header,
  119.     .gptopts = old_dirac_gptopts,
  120.     .granule_is_start = 1,
  121.     .nb_header = 1,
  122. };
  123.