FFmpeg/libavformat/amr.c
Stefano Sabatini 72415b2adb Define AVMediaType enum, and use it instead of enum CodecType, which
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-30 23:30:55 +00:00

194 lines
4.5 KiB
C

/*
* amr file format
* Copyright (c) 2001 ffmpeg project
*
* 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
*/
/*
Write and read amr data according to RFC3267, http://www.ietf.org/rfc/rfc3267.txt?number=3267
Only mono files are supported.
*/
#include "avformat.h"
static const char AMR_header [] = "#!AMR\n";
static const char AMRWB_header [] = "#!AMR-WB\n";
#if CONFIG_AMR_MUXER
static int amr_write_header(AVFormatContext *s)
{
ByteIOContext *pb = s->pb;
AVCodecContext *enc = s->streams[0]->codec;
s->priv_data = NULL;
if (enc->codec_id == CODEC_ID_AMR_NB)
{
put_tag(pb, AMR_header); /* magic number */
}
else if(enc->codec_id == CODEC_ID_AMR_WB)
{
put_tag(pb, AMRWB_header); /* magic number */
}
else
{
return -1;
}
put_flush_packet(pb);
return 0;
}
static int amr_write_packet(AVFormatContext *s, AVPacket *pkt)
{
put_buffer(s->pb, pkt->data, pkt->size);
put_flush_packet(s->pb);
return 0;
}
#endif /* CONFIG_AMR_MUXER */
static int amr_probe(AVProbeData *p)
{
//Only check for "#!AMR" which could be amr-wb, amr-nb.
//This will also trigger multichannel files: "#!AMR_MC1.0\n" and
//"#!AMR-WB_MC1.0\n" (not supported)
if(memcmp(p->buf,AMR_header,5)==0)
return AVPROBE_SCORE_MAX;
else
return 0;
}
/* amr input */
static int amr_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
ByteIOContext *pb = s->pb;
AVStream *st;
uint8_t header[9];
get_buffer(pb, header, 6);
st = av_new_stream(s, 0);
if (!st)
{
return AVERROR(ENOMEM);
}
if(memcmp(header,AMR_header,6)!=0)
{
get_buffer(pb, header+6, 3);
if(memcmp(header,AMRWB_header,9)!=0)
{
return -1;
}
st->codec->codec_tag = MKTAG('s', 'a', 'w', 'b');
st->codec->codec_id = CODEC_ID_AMR_WB;
st->codec->sample_rate = 16000;
}
else
{
st->codec->codec_tag = MKTAG('s', 'a', 'm', 'r');
st->codec->codec_id = CODEC_ID_AMR_NB;
st->codec->sample_rate = 8000;
}
st->codec->channels = 1;
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
av_set_pts_info(st, 64, 1, st->codec->sample_rate);
return 0;
}
static int amr_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
AVCodecContext *enc = s->streams[0]->codec;
int read, size = 0, toc, mode;
if (url_feof(s->pb))
{
return AVERROR(EIO);
}
//FIXME this is wrong, this should rather be in a AVParset
toc=get_byte(s->pb);
mode = (toc >> 3) & 0x0F;
if (enc->codec_id == CODEC_ID_AMR_NB)
{
static const uint8_t packed_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0};
size=packed_size[mode]+1;
}
else if(enc->codec_id == CODEC_ID_AMR_WB)
{
static uint8_t packed_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
size=packed_size[mode];
}
else
{
assert(0);
}
if ( (size==0) || av_new_packet(pkt, size))
{
return AVERROR(EIO);
}
pkt->stream_index = 0;
pkt->pos= url_ftell(s->pb);
pkt->data[0]=toc;
pkt->duration= enc->codec_id == CODEC_ID_AMR_NB ? 160 : 320;
read = get_buffer(s->pb, pkt->data+1, size-1);
if (read != size-1)
{
av_free_packet(pkt);
return AVERROR(EIO);
}
return 0;
}
#if CONFIG_AMR_DEMUXER
AVInputFormat amr_demuxer = {
"amr",
NULL_IF_CONFIG_SMALL("3GPP AMR file format"),
0, /*priv_data_size*/
amr_probe,
amr_read_header,
amr_read_packet,
NULL,
};
#endif
#if CONFIG_AMR_MUXER
AVOutputFormat amr_muxer = {
"amr",
NULL_IF_CONFIG_SMALL("3GPP AMR file format"),
"audio/amr",
"amr",
0,
CODEC_ID_AMR_NB,
CODEC_ID_NONE,
amr_write_header,
amr_write_packet,
};
#endif