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/* |
* 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 "internal.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 can't 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) |
{ |
ACTContext* ctx = s->priv_data; |
AVIOContext *pb = s->pb; |
int size; |
AVStream* st; |
|
int min,sec,msec; |
|
st = avformat_new_stream(s, NULL); |
if (!st) |
return AVERROR(ENOMEM); |
|
avio_skip(pb, 16); |
size=avio_rl32(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; |
avpriv_set_pts_info(st, 64, 1, 100); |
|
st->codec->codec_id=AV_CODEC_ID_G729; |
|
avio_seek(pb, 257, SEEK_SET); |
msec=avio_rl16(pb); |
sec=avio_r8(pb); |
min=avio_rl32(pb); |
|
st->duration = av_rescale(1000*(min*60+sec)+msec, st->codec->sample_rate, 1000 * st->codec->frame_size); |
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ctx->bytes_left_in_chunk=CHUNK_SIZE; |
|
avio_seek(pb, 512, SEEK_SET); |
|
return 0; |
} |
|
|
static int read_packet(AVFormatContext *s, |
AVPacket *pkt) |
{ |
ACTContext *ctx = s->priv_data; |
AVIOContext *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 = avio_read(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 = avio_read(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]; |
} |
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ctx->bytes_left_in_chunk -= frame_size; |
|
if(ctx->bytes_left_in_chunk < frame_size) |
{ |
avio_skip(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, |
}; |