179 lines
3.8 KiB
C
179 lines
3.8 KiB
C
/*
|
|
* amr file format
|
|
* Copyright (c) 2001 ffmpeg project
|
|
*
|
|
* This library 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 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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 this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
/*
|
|
Write and read amr data according to RFC3267, http://www.ietf.org/rfc/rfc3267.txt?number=3267
|
|
|
|
Only amr narrowband (not amr-wb) is supported for now.
|
|
|
|
*/
|
|
#include "avformat.h"
|
|
#include "avi.h"
|
|
|
|
static const unsigned char AMR_header [] = "#!AMR\n";
|
|
|
|
/* AMR_FILE header */
|
|
static int put_amr_header(ByteIOContext *pb, AVCodecContext *enc)
|
|
{
|
|
put_tag(pb, AMR_header); /* magic number */
|
|
return 0;
|
|
}
|
|
|
|
static int amr_write_header(AVFormatContext *s)
|
|
{
|
|
ByteIOContext *pb = &s->pb;
|
|
|
|
s->priv_data = NULL;
|
|
|
|
/* format header */
|
|
if (put_amr_header(pb, &s->streams[0]->codec) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
put_flush_packet(pb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int amr_write_packet(AVFormatContext *s, int stream_index_ptr,
|
|
uint8_t *buf, int size, int force_pts)
|
|
{
|
|
put_buffer(&s->pb, buf, size);
|
|
put_flush_packet(&s->pb);
|
|
return 0;
|
|
}
|
|
|
|
static int amr_write_trailer(AVFormatContext *s)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int amr_probe(AVProbeData *p)
|
|
{
|
|
/* check file header */
|
|
if (p->buf_size < 6)
|
|
return 0;
|
|
if(memcmp(p->buf,AMR_header,6)==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[6];
|
|
|
|
get_buffer(pb, header, 6);
|
|
|
|
if(memcmp(header,AMR_header,6)!=0)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR_NOMEM;
|
|
|
|
st->codec.codec_type = CODEC_TYPE_AUDIO;
|
|
st->codec.codec_tag = CODEC_ID_AMR_NB;
|
|
st->codec.codec_id = CODEC_ID_AMR_NB;
|
|
st->codec.channels = 1;
|
|
st->codec.sample_rate = 8000;
|
|
return 0;
|
|
}
|
|
|
|
#define MAX_SIZE 32
|
|
|
|
static int amr_read_packet(AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
static uint16_t packed_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0};
|
|
uint8_t toc, q, ft;
|
|
int read;
|
|
int size;
|
|
|
|
if (url_feof(&s->pb))
|
|
return -EIO;
|
|
|
|
toc=0;
|
|
|
|
toc=get_byte(&s->pb);
|
|
|
|
q = (toc >> 2) & 0x01;
|
|
ft = (toc >> 3) & 0x0F;
|
|
|
|
size=packed_size[ft];
|
|
//printf("amr_read_packet size=%d\n",size);
|
|
|
|
if (av_new_packet(pkt, size+1))
|
|
return -EIO;
|
|
pkt->stream_index = 0;
|
|
|
|
pkt->data[0]=toc;
|
|
|
|
read = get_buffer(&s->pb, pkt->data+1, size);
|
|
|
|
if (read != size)
|
|
{
|
|
av_free_packet(pkt);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int amr_read_close(AVFormatContext *s)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static AVInputFormat amr_iformat = {
|
|
"amr",
|
|
"3gpp amr file format",
|
|
0,
|
|
amr_probe,
|
|
amr_read_header,
|
|
amr_read_packet,
|
|
amr_read_close,
|
|
};
|
|
|
|
static AVOutputFormat amr_oformat = {
|
|
"amr",
|
|
"3gpp amr file format",
|
|
"audio/amr",
|
|
"amr",
|
|
0,
|
|
CODEC_ID_AMR_NB,
|
|
CODEC_ID_NONE,
|
|
amr_write_header,
|
|
amr_write_packet,
|
|
amr_write_trailer,
|
|
};
|
|
|
|
int amr_init(void)
|
|
{
|
|
av_register_input_format(&amr_iformat);
|
|
av_register_output_format(&amr_oformat);
|
|
return 0;
|
|
}
|