| 1 | /* |
| 2 | * On2 VP8 parser for Ogg |
| 3 | * Copyright (C) 2013 James Almer |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include "libavutil/intreadwrite.h" |
| 23 | #include "avformat.h" |
| 24 | #include "internal.h" |
| 25 | #include "oggdec.h" |
| 26 | |
| 27 | #define VP8_HEADER_SIZE 26 |
| 28 | |
| 29 | static int vp8_header(AVFormatContext *s, int idx) |
| 30 | { |
| 31 | struct ogg *ogg = s->priv_data; |
| 32 | struct ogg_stream *os = ogg->streams + idx; |
| 33 | uint8_t *p = os->buf + os->pstart; |
| 34 | AVStream *st = s->streams[idx]; |
| 35 | AVRational framerate; |
| 36 | |
| 37 | if (os->psize < 7 || p[0] != 0x4f) |
| 38 | return 0; |
| 39 | |
| 40 | switch (p[5]){ |
| 41 | case 0x01: |
| 42 | if (os->psize < VP8_HEADER_SIZE) { |
| 43 | av_log(s, AV_LOG_ERROR, "Invalid OggVP8 header packet"); |
| 44 | return AVERROR_INVALIDDATA; |
| 45 | } |
| 46 | |
| 47 | if (p[6] != 1) { |
| 48 | av_log(s, AV_LOG_WARNING, "Unknown OggVP8 version %d.%d\n", p[6], p[7]); |
| 49 | return AVERROR_INVALIDDATA; |
| 50 | } |
| 51 | |
| 52 | st->codec->width = AV_RB16(p + 8); |
| 53 | st->codec->height = AV_RB16(p + 10); |
| 54 | st->sample_aspect_ratio.num = AV_RB24(p + 12); |
| 55 | st->sample_aspect_ratio.den = AV_RB24(p + 15); |
| 56 | framerate.den = AV_RB32(p + 18); |
| 57 | framerate.num = AV_RB32(p + 22); |
| 58 | |
| 59 | avpriv_set_pts_info(st, 64, framerate.num, framerate.den); |
| 60 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 61 | st->codec->codec_id = AV_CODEC_ID_VP8; |
| 62 | st->need_parsing = AVSTREAM_PARSE_HEADERS; |
| 63 | break; |
| 64 | case 0x02: |
| 65 | if (p[6] != 0x20) |
| 66 | return AVERROR_INVALIDDATA; |
| 67 | ff_vorbis_stream_comment(s, st, p + 7, os->psize - 7); |
| 68 | break; |
| 69 | default: |
| 70 | av_log(s, AV_LOG_ERROR, "Unknown VP8 header type 0x%02X\n", p[5]); |
| 71 | return AVERROR_INVALIDDATA; |
| 72 | } |
| 73 | |
| 74 | return 1; |
| 75 | } |
| 76 | |
| 77 | static uint64_t vp8_gptopts(AVFormatContext *s, int idx, uint64_t granule, int64_t *dts) |
| 78 | { |
| 79 | struct ogg *ogg = s->priv_data; |
| 80 | struct ogg_stream *os = ogg->streams + idx; |
| 81 | |
| 82 | uint64_t pts = (granule >> 32); |
| 83 | uint32_t dist = (granule >> 3) & 0x07ffffff; |
| 84 | |
| 85 | if (!dist) |
| 86 | os->pflags |= AV_PKT_FLAG_KEY; |
| 87 | |
| 88 | if (dts) |
| 89 | *dts = pts; |
| 90 | |
| 91 | return pts; |
| 92 | } |
| 93 | |
| 94 | static int vp8_packet(AVFormatContext *s, int idx) |
| 95 | { |
| 96 | struct ogg *ogg = s->priv_data; |
| 97 | struct ogg_stream *os = ogg->streams + idx; |
| 98 | uint8_t *p = os->buf + os->pstart; |
| 99 | |
| 100 | if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS)) { |
| 101 | int seg; |
| 102 | int duration; |
| 103 | uint8_t *last_pkt = p; |
| 104 | uint8_t *next_pkt; |
| 105 | |
| 106 | seg = os->segp; |
| 107 | duration = (last_pkt[0] >> 4) & 1; |
| 108 | next_pkt = last_pkt += os->psize; |
| 109 | for (; seg < os->nsegs; seg++) { |
| 110 | if (os->segments[seg] < 255) { |
| 111 | duration += (last_pkt[0] >> 4) & 1; |
| 112 | last_pkt = next_pkt + os->segments[seg]; |
| 113 | } |
| 114 | next_pkt += os->segments[seg]; |
| 115 | } |
| 116 | os->lastpts = os->lastdts = vp8_gptopts(s, idx, os->granule, NULL) - duration; |
| 117 | if(s->streams[idx]->start_time == AV_NOPTS_VALUE) { |
| 118 | s->streams[idx]->start_time = os->lastpts; |
| 119 | if (s->streams[idx]->duration) |
| 120 | s->streams[idx]->duration -= s->streams[idx]->start_time; |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | if (os->psize > 0) |
| 125 | os->pduration = (p[0] >> 4) & 1; |
| 126 | |
| 127 | return 0; |
| 128 | } |
| 129 | |
| 130 | const struct ogg_codec ff_vp8_codec = { |
| 131 | .magic = "OVP80", |
| 132 | .magicsize = 5, |
| 133 | .header = vp8_header, |
| 134 | .packet = vp8_packet, |
| 135 | .gptopts = vp8_gptopts, |
| 136 | .nb_header = 1, |
| 137 | }; |