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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.  
  35.     // already parsed the header
  36.     if (st->codec->codec_id == AV_CODEC_ID_DIRAC)
  37.         return 0;
  38.  
  39.     init_get_bits(&gb, os->buf + os->pstart + 13, (os->psize - 13) * 8);
  40.     if (avpriv_dirac_parse_sequence_header(st->codec, &gb, &source) < 0)
  41.         return -1;
  42.  
  43.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  44.     st->codec->codec_id = AV_CODEC_ID_DIRAC;
  45.     // dirac in ogg always stores timestamps as though the video were interlaced
  46.     avpriv_set_pts_info(st, 64, st->codec->time_base.num, 2*st->codec->time_base.den);
  47.     return 1;
  48. }
  49.  
  50. // various undocument things: granule is signed (only for dirac!)
  51. static uint64_t dirac_gptopts(AVFormatContext *s, int idx, uint64_t granule,
  52.                               int64_t *dts_out)
  53. {
  54.     int64_t gp = granule;
  55.     struct ogg *ogg = s->priv_data;
  56.     struct ogg_stream *os = ogg->streams + idx;
  57.  
  58.     unsigned dist  = ((gp >> 14) & 0xff00) | (gp & 0xff);
  59.     int64_t  dts   = (gp >> 31);
  60.     int64_t  pts   = dts + ((gp >> 9) & 0x1fff);
  61.  
  62.     if (!dist)
  63.         os->pflags |= AV_PKT_FLAG_KEY;
  64.  
  65.     if (dts_out)
  66.         *dts_out = dts;
  67.  
  68.     return pts;
  69. }
  70.  
  71. static int old_dirac_header(AVFormatContext *s, int idx)
  72. {
  73.     struct ogg *ogg = s->priv_data;
  74.     struct ogg_stream *os = ogg->streams + idx;
  75.     AVStream *st = s->streams[idx];
  76.     uint8_t *buf = os->buf + os->pstart;
  77.  
  78.     if (buf[0] != 'K')
  79.         return 0;
  80.  
  81.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  82.     st->codec->codec_id = AV_CODEC_ID_DIRAC;
  83.     avpriv_set_pts_info(st, 64, AV_RB32(buf+12), AV_RB32(buf+8));
  84.     return 1;
  85. }
  86.  
  87. static uint64_t old_dirac_gptopts(AVFormatContext *s, int idx, uint64_t gp,
  88.                                   int64_t *dts)
  89. {
  90.     struct ogg *ogg = s->priv_data;
  91.     struct ogg_stream *os = ogg->streams + idx;
  92.     uint64_t iframe = gp >> 30;
  93.     uint64_t pframe = gp & 0x3fffffff;
  94.  
  95.     if (!pframe)
  96.         os->pflags |= AV_PKT_FLAG_KEY;
  97.  
  98.     return iframe + pframe;
  99. }
  100.  
  101. const struct ogg_codec ff_dirac_codec = {
  102.     .magic = "BBCD\0",
  103.     .magicsize = 5,
  104.     .header = dirac_header,
  105.     .gptopts = dirac_gptopts,
  106.     .granule_is_start = 1,
  107.     .nb_header = 1,
  108. };
  109.  
  110. const struct ogg_codec ff_old_dirac_codec = {
  111.     .magic = "KW-DIRAC",
  112.     .magicsize = 8,
  113.     .header = old_dirac_header,
  114.     .gptopts = old_dirac_gptopts,
  115.     .granule_is_start = 1,
  116.     .nb_header = 1,
  117. };
  118.