mirror of https://git.videolan.org/git/ffmpeg.git
112 lines
3.0 KiB
C
112 lines
3.0 KiB
C
/*
|
|
* QOA demuxer
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "avformat.h"
|
|
#include "avio_internal.h"
|
|
#include "demux.h"
|
|
#include "internal.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
|
|
static int qoa_probe(const AVProbeData *p)
|
|
{
|
|
if ((p->buf_size < 16) ||
|
|
(AV_RB32(p->buf) != MKBETAG('q','o','a','f')) ||
|
|
(AV_RB32(p->buf + 4) == 0) ||
|
|
(p->buf[8] == 0) ||
|
|
(AV_RB24(p->buf + 9) == 0) ||
|
|
(AV_RB16(p->buf + 12) == 0) ||
|
|
(AV_RB16(p->buf + 14) == 0))
|
|
return 0;
|
|
return AVPROBE_SCORE_MAX;
|
|
}
|
|
|
|
static int qoa_read_header(AVFormatContext *s)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
AVStream *st;
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
avio_skip(pb, 4);
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codecpar->codec_id = AV_CODEC_ID_QOA;
|
|
st->duration = avio_rb32(pb);
|
|
st->start_time = 0;
|
|
|
|
ffio_ensure_seekback(pb, 4);
|
|
st->codecpar->ch_layout.nb_channels = avio_r8(pb);
|
|
if (st->codecpar->ch_layout.nb_channels == 0)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
st->codecpar->sample_rate = avio_rb24(pb);
|
|
if (st->codecpar->sample_rate == 0)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
avio_seek(pb, -4, SEEK_CUR);
|
|
|
|
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qoa_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
uint16_t size, duration;
|
|
uint8_t hdr[8];
|
|
int64_t pos;
|
|
int ret;
|
|
|
|
if (avio_feof(pb))
|
|
return AVERROR_EOF;
|
|
|
|
pos = avio_tell(pb);
|
|
ret = avio_read(pb, hdr, sizeof(hdr));
|
|
if (ret != sizeof(hdr))
|
|
return AVERROR_EOF;
|
|
|
|
duration = AV_RB16(hdr + 4);
|
|
size = AV_RB16(hdr + 6);
|
|
if ((ret = av_new_packet(pkt, size)) < 0)
|
|
return ret;
|
|
|
|
memcpy(pkt->data, hdr, sizeof(hdr));
|
|
ret = avio_read(pb, pkt->data + sizeof(hdr), size - sizeof(hdr));
|
|
if (ret != size - sizeof(hdr))
|
|
return AVERROR(EIO);
|
|
pkt->stream_index = 0;
|
|
pkt->pos = pos;
|
|
pkt->duration = duration;
|
|
|
|
return 0;
|
|
}
|
|
|
|
const FFInputFormat ff_qoa_demuxer = {
|
|
.p.name = "qoa",
|
|
.p.long_name = NULL_IF_CONFIG_SMALL("QOA"),
|
|
.p.flags = AVFMT_GENERIC_INDEX,
|
|
.p.extensions = "qoa",
|
|
.read_probe = qoa_probe,
|
|
.read_header = qoa_read_header,
|
|
.read_packet = qoa_read_packet,
|
|
};
|