mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/*
|
|
* Copyright (c) 2011 Justin Ruggles
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; 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 "libavcodec/adx.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_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
ADXDemuxerContext *c = s->priv_data;
|
|
AVCodecContext *avctx = s->streams[0]->codec;
|
|
int ret, size;
|
|
|
|
size = BLOCK_SIZE * avctx->channels;
|
|
|
|
pkt->pos = avio_tell(s->pb);
|
|
pkt->stream_index = 0;
|
|
|
|
ret = av_get_packet(s->pb, pkt, size);
|
|
if (ret != size) {
|
|
av_free_packet(pkt);
|
|
return ret < 0 ? ret : AVERROR(EIO);
|
|
}
|
|
if (AV_RB16(pkt->data) & 0x8000) {
|
|
av_free_packet(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, AVFormatParameters *ap)
|
|
{
|
|
ADXDemuxerContext *c = s->priv_data;
|
|
AVCodecContext *avctx;
|
|
int ret;
|
|
|
|
AVStream *st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
avctx = s->streams[0]->codec;
|
|
|
|
if (avio_rb16(s->pb) != 0x8000)
|
|
return AVERROR_INVALIDDATA;
|
|
c->header_size = avio_rb16(s->pb) + 4;
|
|
avio_seek(s->pb, -4, SEEK_CUR);
|
|
|
|
avctx->extradata = av_mallocz(c->header_size + FF_INPUT_BUFFER_PADDING_SIZE);
|
|
if (!avctx->extradata)
|
|
return AVERROR(ENOMEM);
|
|
if (avio_read(s->pb, avctx->extradata, c->header_size) < c->header_size) {
|
|
av_freep(&avctx->extradata);
|
|
return AVERROR(EIO);
|
|
}
|
|
avctx->extradata_size = c->header_size;
|
|
|
|
ret = avpriv_adx_decode_header(avctx, avctx->extradata,
|
|
avctx->extradata_size, &c->header_size,
|
|
NULL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codec->codec_id = s->iformat->value;
|
|
|
|
avpriv_set_pts_info(st, 64, BLOCK_SAMPLES, avctx->sample_rate);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_adx_demuxer = {
|
|
.name = "adx",
|
|
.long_name = NULL_IF_CONFIG_SMALL("CRI ADX"),
|
|
.priv_data_size = sizeof(ADXDemuxerContext),
|
|
.read_header = adx_read_header,
|
|
.read_packet = adx_read_packet,
|
|
.extensions = "adx",
|
|
.value = CODEC_ID_ADPCM_ADX,
|
|
.flags = AVFMT_GENERIC_INDEX,
|
|
};
|