| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 | |||
| 24 | #include "avformat.h" | ||
| 25 | #include "internal.h" | ||
| 26 | #include "oggdec.h" | ||
| 27 | |||
| 28 | #define VP8_HEADER_SIZE 26 | ||
| 29 | |||
| 30 | ✗ | static int vp8_header(AVFormatContext *s, int idx) | |
| 31 | { | ||
| 32 | ✗ | struct ogg *ogg = s->priv_data; | |
| 33 | ✗ | struct ogg_stream *os = ogg->streams + idx; | |
| 34 | ✗ | uint8_t *p = os->buf + os->pstart; | |
| 35 | ✗ | AVStream *st = s->streams[idx]; | |
| 36 | AVRational framerate; | ||
| 37 | |||
| 38 | ✗ | if (os->psize < 7 || p[0] != 0x4f) | |
| 39 | ✗ | return 0; | |
| 40 | |||
| 41 | ✗ | switch (p[5]){ | |
| 42 | ✗ | case 0x01: | |
| 43 | ✗ | if (os->psize < VP8_HEADER_SIZE) { | |
| 44 | ✗ | av_log(s, AV_LOG_ERROR, "Invalid OggVP8 header packet"); | |
| 45 | ✗ | return AVERROR_INVALIDDATA; | |
| 46 | } | ||
| 47 | |||
| 48 | ✗ | if (p[6] != 1) { | |
| 49 | ✗ | av_log(s, AV_LOG_WARNING, | |
| 50 | ✗ | "Unknown OggVP8 version %d.%d\n", p[6], p[7]); | |
| 51 | ✗ | return AVERROR_INVALIDDATA; | |
| 52 | } | ||
| 53 | |||
| 54 | ✗ | st->codecpar->width = AV_RB16(p + 8); | |
| 55 | ✗ | st->codecpar->height = AV_RB16(p + 10); | |
| 56 | ✗ | st->sample_aspect_ratio.num = AV_RB24(p + 12); | |
| 57 | ✗ | st->sample_aspect_ratio.den = AV_RB24(p + 15); | |
| 58 | ✗ | framerate.num = AV_RB32(p + 18); | |
| 59 | ✗ | framerate.den = AV_RB32(p + 22); | |
| 60 | |||
| 61 | ✗ | avpriv_set_pts_info(st, 64, framerate.den, framerate.num); | |
| 62 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
| 63 | ✗ | st->codecpar->codec_id = AV_CODEC_ID_VP8; | |
| 64 | ✗ | ffstream(st)->need_parsing = AVSTREAM_PARSE_HEADERS; | |
| 65 | ✗ | break; | |
| 66 | ✗ | case 0x02: | |
| 67 | ✗ | if (p[6] != 0x20) | |
| 68 | ✗ | return AVERROR_INVALIDDATA; | |
| 69 | ✗ | ff_vorbis_stream_comment(s, st, p + 7, os->psize - 7); | |
| 70 | ✗ | break; | |
| 71 | ✗ | default: | |
| 72 | ✗ | av_log(s, AV_LOG_ERROR, "Unknown VP8 header type 0x%02X\n", p[5]); | |
| 73 | ✗ | return AVERROR_INVALIDDATA; | |
| 74 | } | ||
| 75 | |||
| 76 | ✗ | return 1; | |
| 77 | } | ||
| 78 | |||
| 79 | ✗ | static uint64_t vp8_gptopts(AVFormatContext *s, int idx, | |
| 80 | uint64_t granule, int64_t *dts) | ||
| 81 | { | ||
| 82 | ✗ | struct ogg *ogg = s->priv_data; | |
| 83 | ✗ | struct ogg_stream *os = ogg->streams + idx; | |
| 84 | |||
| 85 | ✗ | int invcnt = !((granule >> 30) & 3); | |
| 86 | // If page granule is that of an invisible vp8 frame, its pts will be | ||
| 87 | // that of the end of the next visible frame. We subtract 1 for those | ||
| 88 | // to prevent messing up pts calculations. | ||
| 89 | ✗ | uint64_t pts = (granule >> 32) - invcnt; | |
| 90 | ✗ | uint32_t dist = (granule >> 3) & 0x07ffffff; | |
| 91 | |||
| 92 | ✗ | if (!dist) | |
| 93 | ✗ | os->pflags |= AV_PKT_FLAG_KEY; | |
| 94 | |||
| 95 | ✗ | if (dts) | |
| 96 | ✗ | *dts = pts; | |
| 97 | |||
| 98 | ✗ | return pts; | |
| 99 | } | ||
| 100 | |||
| 101 | ✗ | static int vp8_packet(AVFormatContext *s, int idx) | |
| 102 | { | ||
| 103 | ✗ | struct ogg *ogg = s->priv_data; | |
| 104 | ✗ | struct ogg_stream *os = ogg->streams + idx; | |
| 105 | ✗ | uint8_t *p = os->buf + os->pstart; | |
| 106 | |||
| 107 | ✗ | if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && | |
| 108 | ✗ | !(os->flags & OGG_FLAG_EOS)) { | |
| 109 | int seg; | ||
| 110 | int duration; | ||
| 111 | ✗ | uint8_t *last_pkt = p; | |
| 112 | uint8_t *next_pkt; | ||
| 113 | |||
| 114 | ✗ | seg = os->segp; | |
| 115 | ✗ | duration = (last_pkt[0] >> 4) & 1; | |
| 116 | ✗ | next_pkt = last_pkt += os->psize; | |
| 117 | ✗ | for (; seg < os->nsegs; seg++) { | |
| 118 | ✗ | if (os->segments[seg] < 255) { | |
| 119 | ✗ | duration += (last_pkt[0] >> 4) & 1; | |
| 120 | ✗ | last_pkt = next_pkt + os->segments[seg]; | |
| 121 | } | ||
| 122 | ✗ | next_pkt += os->segments[seg]; | |
| 123 | } | ||
| 124 | ✗ | os->lastpts = | |
| 125 | ✗ | os->lastdts = vp8_gptopts(s, idx, os->granule, NULL) - duration; | |
| 126 | ✗ | if(s->streams[idx]->start_time == AV_NOPTS_VALUE) { | |
| 127 | ✗ | s->streams[idx]->start_time = os->lastpts; | |
| 128 | ✗ | if (s->streams[idx]->duration && s->streams[idx]->duration != AV_NOPTS_VALUE) | |
| 129 | ✗ | s->streams[idx]->duration -= s->streams[idx]->start_time; | |
| 130 | } | ||
| 131 | } | ||
| 132 | |||
| 133 | ✗ | if (os->psize > 0) | |
| 134 | ✗ | os->pduration = (p[0] >> 4) & 1; | |
| 135 | |||
| 136 | ✗ | return 0; | |
| 137 | } | ||
| 138 | |||
| 139 | const struct ogg_codec ff_vp8_codec = { | ||
| 140 | .magic = "OVP80", | ||
| 141 | .magicsize = 5, | ||
| 142 | .header = vp8_header, | ||
| 143 | .packet = vp8_packet, | ||
| 144 | .gptopts = vp8_gptopts, | ||
| 145 | .nb_header = 1, | ||
| 146 | }; | ||
| 147 |