mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-18 07:15:04 +02:00
![Rodney Baker](/assets/img/avatar_default.png)
and options. Keep old options until next major version bump. Patch by Rodney Baker, rodney d baker a iinet d net d au Originally committed as revision 24021 to svn://svn.ffmpeg.org/ffmpeg/trunk
182 lines
5.4 KiB
C
182 lines
5.4 KiB
C
/*
|
|
* Interface to libgsm for gsm encoding/decoding
|
|
* Copyright (c) 2005 Alban Bedel <albeu@free.fr>
|
|
* Copyright (c) 2006, 2007 Michel Bardiaux <mbardiaux@mediaxim.be>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Interface to libgsm for gsm encoding/decoding
|
|
*/
|
|
|
|
// The idiosyncrasies of GSM-in-WAV are explained at http://kbs.cs.tu-berlin.de/~jutta/toast.html
|
|
|
|
#include "avcodec.h"
|
|
#include <gsm/gsm.h>
|
|
|
|
// gsm.h misses some essential constants
|
|
#define GSM_BLOCK_SIZE 33
|
|
#define GSM_MS_BLOCK_SIZE 65
|
|
#define GSM_FRAME_SIZE 160
|
|
|
|
static av_cold int libgsm_init(AVCodecContext *avctx) {
|
|
if (avctx->channels > 1) {
|
|
av_log(avctx, AV_LOG_ERROR, "Mono required for GSM, got %d channels\n",
|
|
avctx->channels);
|
|
return -1;
|
|
}
|
|
|
|
if(avctx->codec->decode){
|
|
if(!avctx->channels)
|
|
avctx->channels= 1;
|
|
|
|
if(!avctx->sample_rate)
|
|
avctx->sample_rate= 8000;
|
|
|
|
avctx->sample_fmt = SAMPLE_FMT_S16;
|
|
}else{
|
|
if (avctx->sample_rate != 8000) {
|
|
av_log(avctx, AV_LOG_ERROR, "Sample rate 8000Hz required for GSM, got %dHz\n",
|
|
avctx->sample_rate);
|
|
if(avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL)
|
|
return -1;
|
|
}
|
|
if (avctx->bit_rate != 13000 /* Official */ &&
|
|
avctx->bit_rate != 13200 /* Very common */ &&
|
|
avctx->bit_rate != 0 /* Unknown; a.o. mov does not set bitrate when decoding */ ) {
|
|
av_log(avctx, AV_LOG_ERROR, "Bitrate 13000bps required for GSM, got %dbps\n",
|
|
avctx->bit_rate);
|
|
if(avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
avctx->priv_data = gsm_create();
|
|
|
|
switch(avctx->codec_id) {
|
|
case CODEC_ID_GSM:
|
|
avctx->frame_size = GSM_FRAME_SIZE;
|
|
avctx->block_align = GSM_BLOCK_SIZE;
|
|
break;
|
|
case CODEC_ID_GSM_MS: {
|
|
int one = 1;
|
|
gsm_option(avctx->priv_data, GSM_OPT_WAV49, &one);
|
|
avctx->frame_size = 2*GSM_FRAME_SIZE;
|
|
avctx->block_align = GSM_MS_BLOCK_SIZE;
|
|
}
|
|
}
|
|
|
|
avctx->coded_frame= avcodec_alloc_frame();
|
|
avctx->coded_frame->key_frame= 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int libgsm_close(AVCodecContext *avctx) {
|
|
av_freep(&avctx->coded_frame);
|
|
gsm_destroy(avctx->priv_data);
|
|
avctx->priv_data = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static int libgsm_encode_frame(AVCodecContext *avctx,
|
|
unsigned char *frame, int buf_size, void *data) {
|
|
// we need a full block
|
|
if(buf_size < avctx->block_align) return 0;
|
|
|
|
switch(avctx->codec_id) {
|
|
case CODEC_ID_GSM:
|
|
gsm_encode(avctx->priv_data,data,frame);
|
|
break;
|
|
case CODEC_ID_GSM_MS:
|
|
gsm_encode(avctx->priv_data,data,frame);
|
|
gsm_encode(avctx->priv_data,((short*)data)+GSM_FRAME_SIZE,frame+32);
|
|
}
|
|
return avctx->block_align;
|
|
}
|
|
|
|
|
|
AVCodec libgsm_encoder = {
|
|
"libgsm",
|
|
AVMEDIA_TYPE_AUDIO,
|
|
CODEC_ID_GSM,
|
|
0,
|
|
libgsm_init,
|
|
libgsm_encode_frame,
|
|
libgsm_close,
|
|
.sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
|
|
.long_name = NULL_IF_CONFIG_SMALL("libgsm GSM"),
|
|
};
|
|
|
|
AVCodec libgsm_ms_encoder = {
|
|
"libgsm_ms",
|
|
AVMEDIA_TYPE_AUDIO,
|
|
CODEC_ID_GSM_MS,
|
|
0,
|
|
libgsm_init,
|
|
libgsm_encode_frame,
|
|
libgsm_close,
|
|
.sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
|
|
.long_name = NULL_IF_CONFIG_SMALL("libgsm GSM Microsoft variant"),
|
|
};
|
|
|
|
static int libgsm_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
AVPacket *avpkt) {
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
*data_size = 0; /* In case of error */
|
|
if(buf_size < avctx->block_align) return -1;
|
|
switch(avctx->codec_id) {
|
|
case CODEC_ID_GSM:
|
|
if(gsm_decode(avctx->priv_data,buf,data)) return -1;
|
|
*data_size = GSM_FRAME_SIZE*sizeof(int16_t);
|
|
break;
|
|
case CODEC_ID_GSM_MS:
|
|
if(gsm_decode(avctx->priv_data,buf,data) ||
|
|
gsm_decode(avctx->priv_data,buf+33,((int16_t*)data)+GSM_FRAME_SIZE)) return -1;
|
|
*data_size = GSM_FRAME_SIZE*sizeof(int16_t)*2;
|
|
}
|
|
return avctx->block_align;
|
|
}
|
|
|
|
AVCodec libgsm_decoder = {
|
|
"libgsm",
|
|
AVMEDIA_TYPE_AUDIO,
|
|
CODEC_ID_GSM,
|
|
0,
|
|
libgsm_init,
|
|
NULL,
|
|
libgsm_close,
|
|
libgsm_decode_frame,
|
|
.long_name = NULL_IF_CONFIG_SMALL("libgsm GSM"),
|
|
};
|
|
|
|
AVCodec libgsm_ms_decoder = {
|
|
"libgsm_ms",
|
|
AVMEDIA_TYPE_AUDIO,
|
|
CODEC_ID_GSM_MS,
|
|
0,
|
|
libgsm_init,
|
|
NULL,
|
|
libgsm_close,
|
|
libgsm_decode_frame,
|
|
.long_name = NULL_IF_CONFIG_SMALL("libgsm GSM Microsoft variant"),
|
|
};
|