mirror of https://git.ffmpeg.org/ffmpeg.git
132 lines
3.6 KiB
C
132 lines
3.6 KiB
C
/*
|
|
* Copyright (c) 2011 Justin Ruggles
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* CRI ADX demuxer
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
|
|
#define BLOCK_SIZE 18
|
|
#define BLOCK_SAMPLES 32
|
|
|
|
typedef struct ADXDemuxerContext {
|
|
int header_size;
|
|
} ADXDemuxerContext;
|
|
|
|
static int adx_probe(AVProbeData *p)
|
|
{
|
|
int offset;
|
|
if (AV_RB16(p->buf) != 0x8000)
|
|
return 0;
|
|
offset = AV_RB16(&p->buf[2]);
|
|
if ( offset < 8
|
|
|| offset > p->buf_size - 4
|
|
|| memcmp(p->buf + offset - 2, "(c)CRI", 6))
|
|
return 0;
|
|
return AVPROBE_SCORE_MAX * 3 / 4;
|
|
}
|
|
|
|
static int adx_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
ADXDemuxerContext *c = s->priv_data;
|
|
AVCodecParameters *par = s->streams[0]->codecpar;
|
|
int ret, size;
|
|
|
|
if (par->channels <= 0) {
|
|
av_log(s, AV_LOG_ERROR, "invalid number of channels %d\n", par->channels);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
size = BLOCK_SIZE * par->channels;
|
|
|
|
pkt->pos = avio_tell(s->pb);
|
|
pkt->stream_index = 0;
|
|
|
|
ret = av_get_packet(s->pb, pkt, size);
|
|
if (ret != size) {
|
|
av_packet_unref(pkt);
|
|
return ret < 0 ? ret : AVERROR(EIO);
|
|
}
|
|
if (AV_RB16(pkt->data) & 0x8000) {
|
|
av_packet_unref(pkt);
|
|
return AVERROR_EOF;
|
|
}
|
|
pkt->size = size;
|
|
pkt->duration = 1;
|
|
pkt->pts = (pkt->pos - c->header_size) / size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int adx_read_header(AVFormatContext *s)
|
|
{
|
|
ADXDemuxerContext *c = s->priv_data;
|
|
AVCodecParameters *par;
|
|
|
|
AVStream *st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
par = s->streams[0]->codecpar;
|
|
|
|
if (avio_rb16(s->pb) != 0x8000)
|
|
return AVERROR_INVALIDDATA;
|
|
c->header_size = avio_rb16(s->pb) + 4;
|
|
avio_seek(s->pb, -4, SEEK_CUR);
|
|
|
|
if (ff_get_extradata(s, par, s->pb, c->header_size) < 0)
|
|
return AVERROR(ENOMEM);
|
|
|
|
if (par->extradata_size < 12) {
|
|
av_log(s, AV_LOG_ERROR, "Invalid extradata size.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
par->channels = AV_RB8 (par->extradata + 7);
|
|
par->sample_rate = AV_RB32(par->extradata + 8);
|
|
|
|
if (par->channels <= 0) {
|
|
av_log(s, AV_LOG_ERROR, "invalid number of channels %d\n", par->channels);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
par->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
par->codec_id = s->iformat->raw_codec_id;
|
|
par->bit_rate = par->sample_rate * par->channels * BLOCK_SIZE * 8LL / BLOCK_SAMPLES;
|
|
|
|
avpriv_set_pts_info(st, 64, BLOCK_SAMPLES, par->sample_rate);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_adx_demuxer = {
|
|
.name = "adx",
|
|
.long_name = NULL_IF_CONFIG_SMALL("CRI ADX"),
|
|
.read_probe = adx_probe,
|
|
.priv_data_size = sizeof(ADXDemuxerContext),
|
|
.read_header = adx_read_header,
|
|
.read_packet = adx_read_packet,
|
|
.extensions = "adx",
|
|
.raw_codec_id = AV_CODEC_ID_ADPCM_ADX,
|
|
.flags = AVFMT_GENERIC_INDEX,
|
|
};
|