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mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-07 11:13:41 +02:00
FFmpeg/libavformat/xa.c
Michael Niedermayer e37f161e66 Merge remote-tracking branch 'qatar/master'
* qatar/master: (71 commits)
  movenc: Allow writing to a non-seekable output if using empty moov
  movenc: Support adding isml (smooth streaming live) metadata
  libavcodec: Don't crash in avcodec_encode_audio if time_base isn't set
  sunrast: Document the different Sun Raster file format types.
  sunrast: Add a check for experimental type.
  libspeexenc: use AVSampleFormat instead of deprecated/removed SampleFormat
  lavf: remove disabled FF_API_SET_PTS_INFO cruft
  lavf: remove disabled FF_API_OLD_INTERRUPT_CB cruft
  lavf: remove disabled FF_API_REORDER_PRIVATE cruft
  lavf: remove disabled FF_API_SEEK_PUBLIC cruft
  lavf: remove disabled FF_API_STREAM_COPY cruft
  lavf: remove disabled FF_API_PRELOAD cruft
  lavf: remove disabled FF_API_NEW_STREAM cruft
  lavf: remove disabled FF_API_RTSP_URL_OPTIONS cruft
  lavf: remove disabled FF_API_MUXRATE cruft
  lavf: remove disabled FF_API_FILESIZE cruft
  lavf: remove disabled FF_API_TIMESTAMP cruft
  lavf: remove disabled FF_API_LOOP_OUTPUT cruft
  lavf: remove disabled FF_API_LOOP_INPUT cruft
  lavf: remove disabled FF_API_AVSTREAM_QUALITY cruft
  ...

Conflicts:
	doc/APIchanges
	libavcodec/8bps.c
	libavcodec/avcodec.h
	libavcodec/libx264.c
	libavcodec/mjpegbdec.c
	libavcodec/options.c
	libavcodec/sunrast.c
	libavcodec/utils.c
	libavcodec/version.h
	libavcodec/x86/h264_deblock.asm
	libavdevice/libdc1394.c
	libavdevice/v4l2.c
	libavformat/avformat.h
	libavformat/avio.c
	libavformat/avio.h
	libavformat/aviobuf.c
	libavformat/dv.c
	libavformat/mov.c
	libavformat/utils.c
	libavformat/version.h
	libavformat/wtv.c
	libavutil/Makefile
	libavutil/file.c
	libswscale/x86/input.asm
	libswscale/x86/swscale_mmx.c
	libswscale/x86/swscale_template.c
	tests/ref/lavf/ffm

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2012-01-28 07:53:34 +01:00

129 lines
3.8 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;
uint32_t audio_frame_counter;
} 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 = 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);
/* Value in file is average byte rate*/
st->codec->bit_rate = avio_rl32(pb) * 8;
st->codec->block_align = avio_rl16(pb);
st->codec->bits_per_coded_sample = avio_rl16(pb);
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
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(EIO);
/* 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->pts = xa->audio_frame_counter;
/* 14 bytes Samples per channel with 2 samples per byte */
xa->audio_frame_counter += 28 * st->codec->channels;
return ret;
}
AVInputFormat ff_xa_demuxer = {
.name = "xa",
.long_name = NULL_IF_CONFIG_SMALL("Maxis XA File Format"),
.priv_data_size = sizeof(MaxisXADemuxContext),
.read_probe = xa_probe,
.read_header = xa_read_header,
.read_packet = xa_read_packet,
};