mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-12 18:25:03 +00:00
208 lines
5.6 KiB
C
208 lines
5.6 KiB
C
/*
|
|
* ACT file format 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 "riff.h"
|
|
#include "libavcodec/get_bits.h"
|
|
|
|
#define CHUNK_SIZE 512
|
|
#define RIFF_TAG MKTAG('R','I','F','F')
|
|
#define WAVE_TAG MKTAG('W','A','V','E')
|
|
|
|
typedef struct{
|
|
int bytes_left_in_chunk;
|
|
uint8_t audio_buffer[22];///< temporary buffer for ACT frame
|
|
char second_packet; ///< 1 - if temporary buffer contains valid (second) G.729 packet
|
|
} ACTContext;
|
|
|
|
static int probe(AVProbeData *p)
|
|
{
|
|
int i;
|
|
|
|
if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
|
|
(AV_RL32(&p->buf[8]) != WAVE_TAG) ||
|
|
(AV_RL32(&p->buf[16]) != 16))
|
|
return 0;
|
|
|
|
//We cant be sure that this is ACT and not regular WAV
|
|
if (p->buf_size<512)
|
|
return 0;
|
|
|
|
for(i=44; i<256; i++)
|
|
if(p->buf[i])
|
|
return 0;
|
|
|
|
if(p->buf[256]!=0x84)
|
|
return 0;
|
|
|
|
for(i=264; i<512; i++)
|
|
if(p->buf[i])
|
|
return 0;
|
|
|
|
return AVPROBE_SCORE_MAX;
|
|
}
|
|
|
|
static int read_header(AVFormatContext *s,
|
|
AVFormatParameters *ap)
|
|
{
|
|
ACTContext* ctx = s->priv_data;
|
|
ByteIOContext *pb = s->pb;
|
|
int size;
|
|
AVStream* st;
|
|
|
|
int min,sec,msec;
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
url_fskip(pb, 16);
|
|
size=get_le32(pb);
|
|
ff_get_wav_header(pb, st->codec, size);
|
|
|
|
/*
|
|
8000Hz (Fine-rec) file format has 10 bytes long
|
|
packets with 10ms of sound data in them
|
|
*/
|
|
if (st->codec->sample_rate != 8000) {
|
|
av_log(s, AV_LOG_ERROR, "Sample rate %d is not supported.\n", st->codec->sample_rate);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
st->codec->frame_size=80;
|
|
st->codec->channels=1;
|
|
av_set_pts_info(st, 64, 1, 100);
|
|
|
|
st->codec->codec_id=CODEC_ID_G729;
|
|
|
|
url_fseek(pb, 257, SEEK_SET);
|
|
msec=get_le16(pb);
|
|
sec=get_byte(pb);
|
|
min=get_le32(pb);
|
|
|
|
st->duration = av_rescale(1000*(min*60+sec)+msec, st->codec->sample_rate, 1000 * st->codec->frame_size);
|
|
|
|
ctx->bytes_left_in_chunk=CHUNK_SIZE;
|
|
|
|
url_fseek(pb, 512, SEEK_SET);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int read_packet(AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
ACTContext *ctx = s->priv_data;
|
|
ByteIOContext *pb = s->pb;
|
|
int ret;
|
|
int frame_size=s->streams[0]->codec->sample_rate==8000?10:22;
|
|
|
|
|
|
if(s->streams[0]->codec->sample_rate==8000)
|
|
ret=av_new_packet(pkt, 10);
|
|
else
|
|
ret=av_new_packet(pkt, 11);
|
|
|
|
if(ret)
|
|
return ret;
|
|
|
|
if(s->streams[0]->codec->sample_rate==4400 && !ctx->second_packet)
|
|
{
|
|
ret = get_buffer(pb, ctx->audio_buffer, frame_size);
|
|
|
|
if(ret<0)
|
|
return ret;
|
|
if(ret!=frame_size)
|
|
return AVERROR(EIO);
|
|
|
|
pkt->data[0]=ctx->audio_buffer[11];
|
|
pkt->data[1]=ctx->audio_buffer[0];
|
|
pkt->data[2]=ctx->audio_buffer[12];
|
|
pkt->data[3]=ctx->audio_buffer[1];
|
|
pkt->data[4]=ctx->audio_buffer[13];
|
|
pkt->data[5]=ctx->audio_buffer[2];
|
|
pkt->data[6]=ctx->audio_buffer[14];
|
|
pkt->data[7]=ctx->audio_buffer[3];
|
|
pkt->data[8]=ctx->audio_buffer[15];
|
|
pkt->data[9]=ctx->audio_buffer[4];
|
|
pkt->data[10]=ctx->audio_buffer[16];
|
|
|
|
ctx->second_packet=1;
|
|
}
|
|
else if(s->streams[0]->codec->sample_rate==4400 && ctx->second_packet)
|
|
{
|
|
pkt->data[0]=ctx->audio_buffer[5];
|
|
pkt->data[1]=ctx->audio_buffer[17];
|
|
pkt->data[2]=ctx->audio_buffer[6];
|
|
pkt->data[3]=ctx->audio_buffer[18];
|
|
pkt->data[4]=ctx->audio_buffer[7];
|
|
pkt->data[5]=ctx->audio_buffer[19];
|
|
pkt->data[6]=ctx->audio_buffer[8];
|
|
pkt->data[7]=ctx->audio_buffer[20];
|
|
pkt->data[8]=ctx->audio_buffer[9];
|
|
pkt->data[9]=ctx->audio_buffer[21];
|
|
pkt->data[10]=ctx->audio_buffer[10];
|
|
|
|
ctx->second_packet=0;
|
|
}
|
|
else // 8000 Hz
|
|
{
|
|
ret = get_buffer(pb, ctx->audio_buffer, frame_size);
|
|
|
|
if(ret<0)
|
|
return ret;
|
|
if(ret!=frame_size)
|
|
return AVERROR(EIO);
|
|
|
|
pkt->data[0]=ctx->audio_buffer[5];
|
|
pkt->data[1]=ctx->audio_buffer[0];
|
|
pkt->data[2]=ctx->audio_buffer[6];
|
|
pkt->data[3]=ctx->audio_buffer[1];
|
|
pkt->data[4]=ctx->audio_buffer[7];
|
|
pkt->data[5]=ctx->audio_buffer[2];
|
|
pkt->data[6]=ctx->audio_buffer[8];
|
|
pkt->data[7]=ctx->audio_buffer[3];
|
|
pkt->data[8]=ctx->audio_buffer[9];
|
|
pkt->data[9]=ctx->audio_buffer[4];
|
|
}
|
|
|
|
ctx->bytes_left_in_chunk -= frame_size;
|
|
|
|
if(ctx->bytes_left_in_chunk < frame_size)
|
|
{
|
|
url_fskip(pb, ctx->bytes_left_in_chunk);
|
|
ctx->bytes_left_in_chunk=CHUNK_SIZE;
|
|
}
|
|
|
|
pkt->duration=1;
|
|
|
|
return ret;
|
|
}
|
|
|
|
AVInputFormat ff_act_demuxer = {
|
|
.name = "act",
|
|
.long_name = "ACT Voice file format",
|
|
.priv_data_size = sizeof(ACTContext),
|
|
.read_probe = probe,
|
|
.read_header = read_header,
|
|
.read_packet = read_packet,
|
|
};
|