mirror of
https://github.com/pineappleEA/pineapple-src.git
synced 2024-12-05 05:38:43 -05:00
169 lines
4.4 KiB
C
Executable File
169 lines
4.4 KiB
C
Executable File
/*
|
|
* G.729 bit format muxer and demuxer
|
|
* Copyright (c) 2007-2008 Vladimir Voroshilov
|
|
*
|
|
* 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
|
|
*/
|
|
#include "avformat.h"
|
|
#include "internal.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
|
|
|
|
#if CONFIG_BIT_DEMUXER
|
|
static int probe(const AVProbeData *p)
|
|
{
|
|
int i = 0, j, valid = 0;
|
|
|
|
while (2 * i + 3 < p->buf_size){
|
|
if (AV_RL16(&p->buf[2 * i++]) != SYNC_WORD)
|
|
return 0;
|
|
j = AV_RL16(&p->buf[2 * i++]);
|
|
if (j != 0 && j != 0x10 && j != 0x40 && j != 0x50 && j != 0x76)
|
|
return 0;
|
|
if (j)
|
|
valid++;
|
|
i += j;
|
|
}
|
|
if (valid > 10)
|
|
return AVPROBE_SCORE_MAX;
|
|
if (valid > 2)
|
|
return AVPROBE_SCORE_EXTENSION - 1;
|
|
return 0;
|
|
}
|
|
|
|
static int read_header(AVFormatContext *s)
|
|
{
|
|
AVStream* st;
|
|
|
|
st=avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codecpar->codec_id=AV_CODEC_ID_G729;
|
|
st->codecpar->sample_rate=8000;
|
|
st->codecpar->block_align = 16;
|
|
st->codecpar->channels=1;
|
|
|
|
avpriv_set_pts_info(st, 64, 1, 100);
|
|
return 0;
|
|
}
|
|
|
|
static int read_packet(AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
PutBitContext pbo;
|
|
uint16_t buf[8 * MAX_FRAME_SIZE + 2];
|
|
int packet_size;
|
|
uint16_t* src=buf;
|
|
int i, j, ret;
|
|
int64_t pos= avio_tell(pb);
|
|
|
|
if(avio_feof(pb))
|
|
return AVERROR_EOF;
|
|
|
|
avio_rl16(pb); // sync word
|
|
packet_size = avio_rl16(pb) / 8;
|
|
if(packet_size > MAX_FRAME_SIZE)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
ret = avio_read(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);
|
|
|
|
if ((ret = av_new_packet(pkt, packet_size)) < 0)
|
|
return ret;
|
|
|
|
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;
|
|
pkt->pos = pos;
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_bit_demuxer = {
|
|
.name = "bit",
|
|
.long_name = NULL_IF_CONFIG_SMALL("G.729 BIT file format"),
|
|
.read_probe = probe,
|
|
.read_header = read_header,
|
|
.read_packet = read_packet,
|
|
.extensions = "bit",
|
|
};
|
|
#endif
|
|
|
|
#if CONFIG_BIT_MUXER
|
|
static int write_header(AVFormatContext *s)
|
|
{
|
|
AVCodecParameters *par = s->streams[0]->codecpar;
|
|
|
|
if ((par->codec_id != AV_CODEC_ID_G729) || par->channels != 1) {
|
|
av_log(s, AV_LOG_ERROR,
|
|
"only codec g729 with 1 channel is supported by this format\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
par->bits_per_coded_sample = 16;
|
|
par->block_align = (par->bits_per_coded_sample * par->channels) >> 3;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int write_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
GetBitContext gb;
|
|
int i;
|
|
|
|
if (pkt->size != 10)
|
|
return AVERROR(EINVAL);
|
|
|
|
avio_wl16(pb, SYNC_WORD);
|
|
avio_wl16(pb, 8 * pkt->size);
|
|
|
|
init_get_bits(&gb, pkt->data, 8 * pkt->size);
|
|
for (i = 0; i < 8 * pkt->size; i++)
|
|
avio_wl16(pb, get_bits1(&gb) ? BIT_1 : BIT_0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat ff_bit_muxer = {
|
|
.name = "bit",
|
|
.long_name = NULL_IF_CONFIG_SMALL("G.729 BIT file format"),
|
|
.mime_type = "audio/bit",
|
|
.extensions = "bit",
|
|
.audio_codec = AV_CODEC_ID_G729,
|
|
.video_codec = AV_CODEC_ID_NONE,
|
|
.write_header = write_header,
|
|
.write_packet = write_packet,
|
|
};
|
|
#endif
|