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https://github.com/FFmpeg/FFmpeg.git
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127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/*
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* Chronomaster DFA Format Demuxer
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* Copyright (c) 2011 Konstantin Shishkov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "internal.h"
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static int dfa_probe(AVProbeData *p)
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{
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if (p->buf_size < 4 || AV_RL32(p->buf) != MKTAG('D', 'F', 'I', 'A'))
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int dfa_read_header(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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AVStream *st;
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int frames;
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int version;
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uint32_t mspf;
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if (avio_rl32(pb) != MKTAG('D', 'F', 'I', 'A')) {
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av_log(s, AV_LOG_ERROR, "Invalid magic for DFA\n");
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return AVERROR_INVALIDDATA;
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}
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version = avio_rl16(pb);
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frames = avio_rl16(pb);
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codec->codec_id = AV_CODEC_ID_DFA;
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st->codec->width = avio_rl16(pb);
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st->codec->height = avio_rl16(pb);
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mspf = avio_rl32(pb);
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if (!mspf) {
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av_log(s, AV_LOG_WARNING, "Zero FPS reported, defaulting to 10\n");
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mspf = 100;
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}
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avpriv_set_pts_info(st, 24, mspf, 1000);
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avio_skip(pb, 128 - 16); // padding
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st->duration = frames;
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if (ff_alloc_extradata(st->codec, 2))
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return AVERROR(ENOMEM);
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AV_WL16(st->codec->extradata, version);
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if (version == 0x100)
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st->sample_aspect_ratio = (AVRational){2, 1};
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return 0;
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}
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static int dfa_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVIOContext *pb = s->pb;
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uint32_t frame_size;
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int ret, first = 1;
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if (pb->eof_reached)
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return AVERROR_EOF;
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if (av_get_packet(pb, pkt, 12) != 12)
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return AVERROR(EIO);
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while (!pb->eof_reached) {
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if (!first) {
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ret = av_append_packet(pb, pkt, 12);
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if (ret < 0) {
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av_free_packet(pkt);
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return ret;
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}
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} else
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first = 0;
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frame_size = AV_RL32(pkt->data + pkt->size - 8);
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if (frame_size > INT_MAX - 4) {
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av_log(s, AV_LOG_ERROR, "Too large chunk size: %d\n", frame_size);
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return AVERROR(EIO);
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}
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if (AV_RL32(pkt->data + pkt->size - 12) == MKTAG('E', 'O', 'F', 'R')) {
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if (frame_size) {
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av_log(s, AV_LOG_WARNING, "skipping %d bytes of end-of-frame marker chunk\n",
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frame_size);
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avio_skip(pb, frame_size);
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}
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return 0;
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}
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ret = av_append_packet(pb, pkt, frame_size);
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if (ret < 0) {
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av_free_packet(pkt);
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return ret;
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}
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}
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return 0;
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}
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AVInputFormat ff_dfa_demuxer = {
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.name = "dfa",
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.long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"),
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.read_probe = dfa_probe,
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.read_header = dfa_read_header,
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.read_packet = dfa_read_packet,
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.flags = AVFMT_GENERIC_INDEX,
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};
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