mirror of
https://github.com/FFmpeg/FFmpeg.git
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121 lines
3.3 KiB
C
121 lines
3.3 KiB
C
/*
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* SDR2 demuxer
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* Copyright (c) 2014 Paul B Mahol
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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 sdr2_probe(const AVProbeData *p)
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{
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if (AV_RL32(p->buf) != MKTAG('S', 'R', 'A', 1))
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return 0;
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return AVPROBE_SCORE_EXTENSION;
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}
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#define FIRST 0xA8
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static int sdr2_read_header(AVFormatContext *s)
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{
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AVStream *st, *ast;
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ast = avformat_new_stream(s, 0);
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if (!ast)
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return AVERROR(ENOMEM);
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st = avformat_new_stream(s, 0);
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if (!st)
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return AVERROR(ENOMEM);
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avio_skip(s->pb, 20);
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avpriv_set_pts_info(st, 64, 1, avio_rl32(s->pb));
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->width = avio_rl32(s->pb);
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st->codecpar->height = avio_rl32(s->pb);
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st->codecpar->codec_id = AV_CODEC_ID_H264;
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ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL;
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ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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ast->codecpar->ch_layout.nb_channels = 1;
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ast->codecpar->sample_rate = 8000;
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ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
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avpriv_set_pts_info(ast, 64, 1, 8000);
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avio_seek(s->pb, FIRST, SEEK_SET);
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return 0;
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}
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static const uint8_t header[24] = {
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0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1e,
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0xa6, 0x80, 0xb0, 0x7e, 0x40, 0x00, 0x00, 0x00,
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0x01, 0x68, 0xce, 0x38, 0x80, 0x00, 0x00, 0x00
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};
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static int sdr2_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int64_t pos;
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unsigned next;
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int flags, ret = 0, is_video;
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pos = avio_tell(s->pb);
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flags = avio_rl32(s->pb);
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avio_skip(s->pb, 4);
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next = avio_rl32(s->pb);
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if (next <= 52)
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, 6);
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is_video = avio_rl32(s->pb);
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avio_skip(s->pb, 30);
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if (pos == FIRST) {
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if ((ret = av_new_packet(pkt, next - 52 + 24)) < 0)
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return ret;
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memcpy(pkt->data, header, 24);
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ret = avio_read(s->pb, pkt->data + 24, next - 52);
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if (ret < 0) {
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return ret;
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}
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av_shrink_packet(pkt, ret + 24);
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} else {
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ret = av_get_packet(s->pb, pkt, next - 52);
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}
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pkt->stream_index = !!is_video;
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pkt->pos = pos;
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if (flags & (1 << 12))
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pkt->flags |= AV_PKT_FLAG_KEY;
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return ret;
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}
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const AVInputFormat ff_sdr2_demuxer = {
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.name = "sdr2",
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.long_name = NULL_IF_CONFIG_SMALL("SDR2"),
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.read_probe = sdr2_probe,
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.read_header = sdr2_read_header,
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.read_packet = sdr2_read_packet,
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.extensions = "sdr2",
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.flags = AVFMT_GENERIC_INDEX,
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};
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