| 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->framerate.den, 2*st->codec->framerate.num); |
| 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 | }; |