130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/*
|
|
* Interface to libfaac for aac encoding
|
|
* Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com>
|
|
*
|
|
* This library 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 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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 this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
/**
|
|
* @file faacaudio.c
|
|
* Interface to libfaac for aac encoding.
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include <faac.h>
|
|
|
|
typedef struct FaacAudioContext {
|
|
faacEncHandle faac_handle;
|
|
} FaacAudioContext;
|
|
|
|
static int Faac_encode_init(AVCodecContext *avctx)
|
|
{
|
|
FaacAudioContext *s = avctx->priv_data;
|
|
faacEncConfigurationPtr faac_cfg;
|
|
unsigned long samples_input, max_bytes_output;
|
|
|
|
/* number of channels */
|
|
if (avctx->channels < 1 || avctx->channels > 6)
|
|
return -1;
|
|
|
|
s->faac_handle = faacEncOpen(avctx->sample_rate,
|
|
avctx->channels,
|
|
&samples_input, &max_bytes_output);
|
|
|
|
/* check faac version */
|
|
faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
|
|
if (faac_cfg->version != FAAC_CFG_VERSION) {
|
|
av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
|
|
faacEncClose(s->faac_handle);
|
|
return -1;
|
|
}
|
|
|
|
/* put the options in the configuration struct */
|
|
faac_cfg->aacObjectType = LOW;
|
|
faac_cfg->mpegVersion = MPEG4;
|
|
faac_cfg->useTns = 0;
|
|
faac_cfg->allowMidside = 1;
|
|
faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
|
|
if(avctx->flags & CODEC_FLAG_QSCALE) {
|
|
faac_cfg->bitRate = 0;
|
|
faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
|
|
}
|
|
faac_cfg->outputFormat = 0;
|
|
faac_cfg->inputFormat = FAAC_INPUT_16BIT;
|
|
|
|
if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
|
|
av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
|
|
return -1;
|
|
}
|
|
|
|
avctx->frame_size = samples_input / avctx->channels;
|
|
|
|
avctx->coded_frame= avcodec_alloc_frame();
|
|
avctx->coded_frame->key_frame= 1;
|
|
|
|
/* Set decoder specific info */
|
|
avctx->extradata_size = 0;
|
|
if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
|
|
|
|
unsigned char *buffer;
|
|
unsigned long decoder_specific_info_size;
|
|
|
|
if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
|
|
&decoder_specific_info_size)) {
|
|
avctx->extradata = buffer;
|
|
avctx->extradata_size = decoder_specific_info_size;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int Faac_encode_frame(AVCodecContext *avctx,
|
|
unsigned char *frame, int buf_size, void *data)
|
|
{
|
|
FaacAudioContext *s = avctx->priv_data;
|
|
int bytes_written;
|
|
|
|
bytes_written = faacEncEncode(s->faac_handle,
|
|
data,
|
|
avctx->frame_size * avctx->channels,
|
|
frame,
|
|
buf_size);
|
|
|
|
return bytes_written;
|
|
}
|
|
|
|
int Faac_encode_close(AVCodecContext *avctx)
|
|
{
|
|
FaacAudioContext *s = avctx->priv_data;
|
|
|
|
av_freep(&avctx->coded_frame);
|
|
|
|
//if (avctx->extradata_size) free(avctx->extradata);
|
|
|
|
faacEncClose(s->faac_handle);
|
|
return 0;
|
|
}
|
|
|
|
AVCodec faac_encoder = {
|
|
"aac",
|
|
CODEC_TYPE_AUDIO,
|
|
CODEC_ID_AAC,
|
|
sizeof(FaacAudioContext),
|
|
Faac_encode_init,
|
|
Faac_encode_frame,
|
|
Faac_encode_close
|
|
};
|