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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Chronomaster DFA Format Demuxer |
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| 3 | * Copyright (c) 2011 Konstantin Shishkov |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "libavutil/intreadwrite.h" |
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| 23 | #include "avformat.h" |
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| 24 | #include "internal.h" |
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| 25 | |||
| 26 | static int dfa_probe(AVProbeData *p) |
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| 27 | { |
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| 28 | if (p->buf_size < 4 || AV_RL32(p->buf) != MKTAG('D', 'F', 'I', 'A')) |
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| 29 | return 0; |
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| 30 | |||
| 31 | return AVPROBE_SCORE_MAX; |
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| 32 | } |
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| 33 | |||
| 34 | static int dfa_read_header(AVFormatContext *s) |
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| 35 | { |
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| 36 | AVIOContext *pb = s->pb; |
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| 37 | AVStream *st; |
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| 38 | int frames; |
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| 39 | int version; |
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| 40 | uint32_t mspf; |
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| 41 | |||
| 42 | if (avio_rl32(pb) != MKTAG('D', 'F', 'I', 'A')) { |
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| 43 | av_log(s, AV_LOG_ERROR, "Invalid magic for DFA\n"); |
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| 44 | return AVERROR_INVALIDDATA; |
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| 45 | } |
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| 46 | |||
| 47 | version = avio_rl16(pb); |
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| 48 | frames = avio_rl16(pb); |
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| 49 | |||
| 50 | st = avformat_new_stream(s, NULL); |
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| 51 | if (!st) |
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| 52 | return AVERROR(ENOMEM); |
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| 53 | |||
| 54 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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| 55 | st->codec->codec_id = AV_CODEC_ID_DFA; |
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| 56 | st->codec->width = avio_rl16(pb); |
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| 57 | st->codec->height = avio_rl16(pb); |
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| 58 | mspf = avio_rl32(pb); |
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| 59 | if (!mspf) { |
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| 60 | av_log(s, AV_LOG_WARNING, "Zero FPS reported, defaulting to 10\n"); |
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| 61 | mspf = 100; |
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| 62 | } |
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| 63 | avpriv_set_pts_info(st, 24, mspf, 1000); |
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| 64 | avio_skip(pb, 128 - 16); // padding |
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| 65 | st->duration = frames; |
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| 66 | |||
| 67 | if (ff_alloc_extradata(st->codec, 2)) |
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| 68 | return AVERROR(ENOMEM); |
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| 69 | AV_WL16(st->codec->extradata, version); |
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| 70 | if (version == 0x100) |
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| 71 | st->sample_aspect_ratio = (AVRational){2, 1}; |
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| 72 | |||
| 73 | return 0; |
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| 74 | } |
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| 75 | |||
| 76 | static int dfa_read_packet(AVFormatContext *s, AVPacket *pkt) |
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| 77 | { |
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| 78 | AVIOContext *pb = s->pb; |
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| 79 | uint32_t frame_size; |
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| 80 | int ret, first = 1; |
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| 81 | |||
| 82 | if (pb->eof_reached) |
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| 83 | return AVERROR_EOF; |
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| 84 | |||
| 85 | if (av_get_packet(pb, pkt, 12) != 12) |
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| 86 | return AVERROR(EIO); |
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| 87 | while (!pb->eof_reached) { |
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| 88 | if (!first) { |
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| 89 | ret = av_append_packet(pb, pkt, 12); |
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| 90 | if (ret < 0) { |
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| 91 | av_free_packet(pkt); |
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| 92 | return ret; |
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| 93 | } |
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| 94 | } else |
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| 95 | first = 0; |
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| 96 | frame_size = AV_RL32(pkt->data + pkt->size - 8); |
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| 97 | if (frame_size > INT_MAX - 4) { |
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| 98 | av_log(s, AV_LOG_ERROR, "Too large chunk size: %d\n", frame_size); |
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| 99 | return AVERROR(EIO); |
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| 100 | } |
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| 101 | if (AV_RL32(pkt->data + pkt->size - 12) == MKTAG('E', 'O', 'F', 'R')) { |
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| 102 | if (frame_size) { |
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| 103 | av_log(s, AV_LOG_WARNING, "skipping %d bytes of end-of-frame marker chunk\n", |
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| 104 | frame_size); |
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| 105 | avio_skip(pb, frame_size); |
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| 106 | } |
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| 107 | return 0; |
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| 108 | } |
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| 109 | ret = av_append_packet(pb, pkt, frame_size); |
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| 110 | if (ret < 0) { |
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| 111 | av_free_packet(pkt); |
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| 112 | return ret; |
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| 113 | } |
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| 114 | } |
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| 115 | |||
| 116 | return 0; |
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| 117 | } |
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| 118 | |||
| 119 | AVInputFormat ff_dfa_demuxer = { |
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| 120 | .name = "dfa", |
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| 121 | .long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"), |
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| 122 | .read_probe = dfa_probe, |
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| 123 | .read_header = dfa_read_header, |
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| 124 | .read_packet = dfa_read_packet, |
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| 125 | .flags = AVFMT_GENERIC_INDEX, |
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| 126 | }; |