mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-12-05 01:56:41 +00:00
7a72695c05
* commit '36ef5369ee9b336febc2c270f8718cec4476cb85': Replace all CODEC_ID_* with AV_CODEC_ID_* lavc: add AV prefix to codec ids. Conflicts: doc/APIchanges doc/examples/decoding_encoding.c doc/examples/muxing.c ffmpeg.c ffprobe.c ffserver.c libavcodec/8svx.c libavcodec/avcodec.h libavcodec/dnxhd_parser.c libavcodec/dvdsubdec.c libavcodec/error_resilience.c libavcodec/h263dec.c libavcodec/libvorbisenc.c libavcodec/mjpeg_parser.c libavcodec/mjpegenc.c libavcodec/mpeg12.c libavcodec/mpeg4videodec.c libavcodec/mpegvideo.c libavcodec/mpegvideo_enc.c libavcodec/pcm.c libavcodec/r210dec.c libavcodec/utils.c libavcodec/v210dec.c libavcodec/version.h libavdevice/alsa-audio-dec.c libavdevice/bktr.c libavdevice/v4l2.c libavformat/asfdec.c libavformat/asfenc.c libavformat/avformat.h libavformat/avidec.c libavformat/caf.c libavformat/electronicarts.c libavformat/flacdec.c libavformat/flvdec.c libavformat/flvenc.c libavformat/framecrcenc.c libavformat/img2.c libavformat/img2dec.c libavformat/img2enc.c libavformat/ipmovie.c libavformat/isom.c libavformat/matroska.c libavformat/matroskadec.c libavformat/matroskaenc.c libavformat/mov.c libavformat/movenc.c libavformat/mp3dec.c libavformat/mpeg.c libavformat/mpegts.c libavformat/mxf.c libavformat/mxfdec.c libavformat/mxfenc.c libavformat/nsvdec.c libavformat/nut.c libavformat/oggenc.c libavformat/pmpdec.c libavformat/rawdec.c libavformat/rawenc.c libavformat/riff.c libavformat/sdp.c libavformat/utils.c libavformat/vocenc.c libavformat/wtv.c libavformat/xmv.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/*
|
|
* Maxis XA (.xa) File Demuxer
|
|
* Copyright (c) 2008 Robert Marston
|
|
*
|
|
* 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
|
|
* Maxis XA File Demuxer
|
|
* by Robert Marston (rmarston@gmail.com)
|
|
* for more information on the XA audio format see
|
|
* http://wiki.multimedia.cx/index.php?title=Maxis_XA
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
|
|
#define XA00_TAG MKTAG('X', 'A', 0, 0)
|
|
#define XAI0_TAG MKTAG('X', 'A', 'I', 0)
|
|
#define XAJ0_TAG MKTAG('X', 'A', 'J', 0)
|
|
|
|
typedef struct MaxisXADemuxContext {
|
|
uint32_t out_size;
|
|
uint32_t sent_bytes;
|
|
} MaxisXADemuxContext;
|
|
|
|
static int xa_probe(AVProbeData *p)
|
|
{
|
|
int channels, srate, bits_per_sample;
|
|
if (p->buf_size < 24)
|
|
return 0;
|
|
switch(AV_RL32(p->buf)) {
|
|
case XA00_TAG:
|
|
case XAI0_TAG:
|
|
case XAJ0_TAG:
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
channels = AV_RL16(p->buf + 10);
|
|
srate = AV_RL32(p->buf + 12);
|
|
bits_per_sample = AV_RL16(p->buf + 22);
|
|
if (!channels || channels > 8 || !srate || srate > 192000 ||
|
|
bits_per_sample < 4 || bits_per_sample > 32)
|
|
return 0;
|
|
return AVPROBE_SCORE_MAX/2;
|
|
}
|
|
|
|
static int xa_read_header(AVFormatContext *s)
|
|
{
|
|
MaxisXADemuxContext *xa = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
AVStream *st;
|
|
|
|
/*Set up the XA Audio Decoder*/
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codec->codec_id = AV_CODEC_ID_ADPCM_EA_MAXIS_XA;
|
|
avio_skip(pb, 4); /* Skip the XA ID */
|
|
xa->out_size = avio_rl32(pb);
|
|
avio_skip(pb, 2); /* Skip the tag */
|
|
st->codec->channels = avio_rl16(pb);
|
|
st->codec->sample_rate = avio_rl32(pb);
|
|
avio_skip(pb, 4); /* Skip average byte rate */
|
|
avio_skip(pb, 2); /* Skip block align */
|
|
avio_skip(pb, 2); /* Skip bits-per-sample */
|
|
|
|
st->codec->bit_rate = av_clip(15LL * st->codec->channels * 8 *
|
|
st->codec->sample_rate / 28, 0, INT_MAX);
|
|
|
|
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
|
|
st->start_time = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xa_read_packet(AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
MaxisXADemuxContext *xa = s->priv_data;
|
|
AVStream *st = s->streams[0];
|
|
AVIOContext *pb = s->pb;
|
|
unsigned int packet_size;
|
|
int ret;
|
|
|
|
if (xa->sent_bytes >= xa->out_size)
|
|
return AVERROR_EOF;
|
|
/* 1 byte header and 14 bytes worth of samples * number channels per block */
|
|
packet_size = 15*st->codec->channels;
|
|
|
|
ret = av_get_packet(pb, pkt, packet_size);
|
|
if(ret < 0)
|
|
return ret;
|
|
|
|
pkt->stream_index = st->index;
|
|
xa->sent_bytes += packet_size;
|
|
pkt->duration = 28;
|
|
|
|
return ret;
|
|
}
|
|
|
|
AVInputFormat ff_xa_demuxer = {
|
|
.name = "xa",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Maxis XA"),
|
|
.priv_data_size = sizeof(MaxisXADemuxContext),
|
|
.read_probe = xa_probe,
|
|
.read_header = xa_read_header,
|
|
.read_packet = xa_read_packet,
|
|
};
|