150 lines
3.0 KiB
C
150 lines
3.0 KiB
C
#include "avformat.h"
|
|
#include "libavcodec/get_bits.h"
|
|
#include "libavcodec/put_bits.h"
|
|
|
|
#define MAX_FRAME_SIZE 10
|
|
|
|
#define SYNC_WORD 0x6b21
|
|
#define BIT_0 0x7f
|
|
#define BIT_1 0x81
|
|
|
|
static int probe(AVProbeData *p)
|
|
{
|
|
int i;
|
|
i=AV_RL16(&p->buf[0]);
|
|
if(i != SYNC_WORD)
|
|
return 0;
|
|
|
|
switch(AV_RL16(&p->buf[2]))
|
|
{
|
|
case 0x40:
|
|
case 0x50:
|
|
return AVPROBE_SCORE_MAX/2;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int read_header(AVFormatContext *s, AVFormatParameters *ap)
|
|
{
|
|
AVStream* st;
|
|
ByteIOContext *pb = s->pb;
|
|
|
|
st=av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
url_fskip(pb, 2);
|
|
switch(get_le16(pb))
|
|
{
|
|
case 0x40:
|
|
st->codec->bit_rate = 6400;
|
|
break;
|
|
case 0x50:
|
|
st->codec->bit_rate = 8000;
|
|
break;
|
|
}
|
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codec->codec_id=CODEC_ID_G729;
|
|
st->codec->sample_rate=8000;
|
|
st->codec->block_align = 16;
|
|
st->codec->channels=1;
|
|
|
|
av_set_pts_info(st, 64, 1, 100);
|
|
url_fseek(pb, 0, SEEK_SET);
|
|
return 0;
|
|
}
|
|
|
|
static int read_packet(AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
ByteIOContext *pb = s->pb;
|
|
PutBitContext pbo;
|
|
uint16_t buf[8 * MAX_FRAME_SIZE + 2];
|
|
int packet_size;
|
|
int sync;
|
|
uint16_t* src=buf;
|
|
int i, j, ret;
|
|
|
|
if(url_feof(pb))
|
|
return AVERROR(EIO);
|
|
|
|
sync = get_le16(pb); // sync word
|
|
packet_size = get_le16(pb) / 8;
|
|
assert(packet_size < 8 * MAX_FRAME_SIZE);
|
|
|
|
ret = get_buffer(pb, (uint8_t*)buf, (8 * packet_size) * sizeof(uint16_t));
|
|
if(ret<0)
|
|
return ret;
|
|
if(ret != 8 * packet_size * sizeof(uint16_t))
|
|
return AVERROR(EIO);
|
|
|
|
av_new_packet(pkt, packet_size);
|
|
|
|
init_put_bits(&pbo, pkt->data, packet_size);
|
|
for(j=0; j < packet_size; j++)
|
|
for(i=0; i<8;i++)
|
|
put_bits(&pbo,1, AV_RL16(src++) == BIT_1 ? 1 : 0);
|
|
|
|
flush_put_bits(&pbo);
|
|
|
|
pkt->duration=1;
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_bit_demuxer = {
|
|
"bit",
|
|
"G.729 BIT file format",
|
|
0,
|
|
probe,
|
|
read_header,
|
|
read_packet,
|
|
.extensions = "bit"
|
|
};
|
|
|
|
#ifdef CONFIG_MUXERS
|
|
static int write_header(AVFormatContext *s)
|
|
{
|
|
AVCodecContext *enc = s->streams[0]->codec;
|
|
|
|
enc->codec_id = CODEC_ID_G729;
|
|
enc->channels = 1;
|
|
enc->bits_per_coded_sample = 16;
|
|
enc->block_align = (enc->bits_per_coded_sample * enc->channels) >> 3;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int write_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
ByteIOContext *pb = s->pb;
|
|
GetBitContext gb;
|
|
int i;
|
|
uint16_t b;
|
|
|
|
put_le16(pb, SYNC_WORD);
|
|
put_le16(pb, 8 * 10);
|
|
|
|
init_get_bits(&gb, pkt->data, 8*10);
|
|
for(i=0; i< 8 * 10; i++)
|
|
put_le16(pb, get_bits1(&gb) ? BIT_1 : BIT_0);
|
|
put_flush_packet(pb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat ff_bit_muxer = {
|
|
"bit",
|
|
"G.729 BIT file format",
|
|
"audio/bit",
|
|
"bit",
|
|
0,
|
|
CODEC_ID_G729,
|
|
CODEC_ID_NONE,
|
|
write_header,
|
|
write_packet,
|
|
.extensions = "bit"
|
|
};
|
|
#endif
|