| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2010 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 "avformat.h" | ||
| 22 | #include "demux.h" | ||
| 23 | #include "internal.h" | ||
| 24 | #include "riff.h" | ||
| 25 | #include "libavutil/intreadwrite.h" | ||
| 26 | |||
| 27 | 7128 | static int probe(const AVProbeData *p) | |
| 28 | { | ||
| 29 |
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7128 | if (AV_RL32(p->buf) == MKTAG('D','K','I','F') |
| 30 |
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38 | && !AV_RL16(p->buf+4) && AV_RL16(p->buf+6) == 32) |
| 31 | 38 | return AVPROBE_SCORE_MAX-2; | |
| 32 | |||
| 33 | 7090 | return 0; | |
| 34 | } | ||
| 35 | |||
| 36 | 41 | static int read_header(AVFormatContext *s) | |
| 37 | { | ||
| 38 | AVStream *st; | ||
| 39 | AVRational time_base; | ||
| 40 | |||
| 41 | 41 | avio_rl32(s->pb); // DKIF | |
| 42 | 41 | avio_rl16(s->pb); // version | |
| 43 | 41 | avio_rl16(s->pb); // header size | |
| 44 | |||
| 45 | 41 | st = avformat_new_stream(s, NULL); | |
| 46 |
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41 | if (!st) |
| 47 | ✗ | return AVERROR(ENOMEM); | |
| 48 | |||
| 49 | |||
| 50 | 41 | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
| 51 | 41 | st->codecpar->codec_tag = avio_rl32(s->pb); | |
| 52 | 41 | st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, st->codecpar->codec_tag); | |
| 53 | 41 | st->codecpar->width = avio_rl16(s->pb); | |
| 54 | 41 | st->codecpar->height = avio_rl16(s->pb); | |
| 55 | 41 | time_base.den = avio_rl32(s->pb); | |
| 56 | 41 | time_base.num = avio_rl32(s->pb); | |
| 57 | 41 | st->nb_frames = avio_rl32(s->pb); | |
| 58 | 41 | avio_skip(s->pb, 4); // unused | |
| 59 | |||
| 60 | // Infer duration from nb_frames, in order to be backward compatible with | ||
| 61 | // previous IVF demuxer. | ||
| 62 | // It is popular to configure time_base to 1/frame_rate by IVF muxer, that | ||
| 63 | // the duration happens to be the same with nb_frames. See | ||
| 64 | // `https://chromium.googlesource.com/webm/vp8-test-vectors/+/refs/heads/main` | ||
| 65 | 41 | st->duration = st->nb_frames; | |
| 66 | |||
| 67 | 41 | ffstream(st)->need_parsing = AVSTREAM_PARSE_HEADERS; | |
| 68 | |||
| 69 |
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41 | if (!time_base.den || !time_base.num) { |
| 70 | ✗ | av_log(s, AV_LOG_ERROR, "Invalid frame rate\n"); | |
| 71 | ✗ | return AVERROR_INVALIDDATA; | |
| 72 | } | ||
| 73 | |||
| 74 | 41 | avpriv_set_pts_info(st, 64, time_base.num, time_base.den); | |
| 75 | |||
| 76 | 41 | return 0; | |
| 77 | } | ||
| 78 | |||
| 79 | 1348 | static int read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 80 | { | ||
| 81 | 1348 | int ret, size = avio_rl32(s->pb); | |
| 82 | 1348 | int64_t pts = avio_rl64(s->pb); | |
| 83 | |||
| 84 | 1348 | ret = av_get_packet(s->pb, pkt, size); | |
| 85 | 1348 | pkt->stream_index = 0; | |
| 86 | 1348 | pkt->pts = pts; | |
| 87 | 1348 | pkt->pos -= 12; | |
| 88 | |||
| 89 | 1348 | return ret; | |
| 90 | } | ||
| 91 | |||
| 92 | const FFInputFormat ff_ivf_demuxer = { | ||
| 93 | .p.name = "ivf", | ||
| 94 | .p.long_name = NULL_IF_CONFIG_SMALL("On2 IVF"), | ||
| 95 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 96 | .p.codec_tag = (const AVCodecTag* const []){ ff_codec_bmp_tags, 0 }, | ||
| 97 | .read_probe = probe, | ||
| 98 | .read_header = read_header, | ||
| 99 | .read_packet = read_packet, | ||
| 100 | }; | ||
| 101 |