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/*
* Interface to libfaac for aac encoding
* Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com>
* |
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* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* 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 |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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/** |
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* @file libavcodec/libfaac.c |
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* Interface to libfaac for aac encoding.
*/
#include "avcodec.h"
#include <faac.h>
typedef struct FaacAudioContext {
faacEncHandle faac_handle;
} FaacAudioContext;
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static av_cold int Faac_encode_init(AVCodecContext *avctx) |
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{
FaacAudioContext *s = avctx->priv_data;
faacEncConfigurationPtr faac_cfg;
unsigned long samples_input, max_bytes_output;
/* number of channels */ |
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if (avctx->channels < 1 || avctx->channels > 6) {
av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels); |
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return -1; |
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} |
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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) { |
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av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version); |
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faacEncClose(s->faac_handle);
return -1;
}
/* put the options in the configuration struct */ |
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switch(avctx->profile) {
case FF_PROFILE_AAC_MAIN:
faac_cfg->aacObjectType = MAIN;
break;
case FF_PROFILE_UNKNOWN:
case FF_PROFILE_AAC_LOW:
faac_cfg->aacObjectType = LOW;
break;
case FF_PROFILE_AAC_SSR:
faac_cfg->aacObjectType = SSR;
break;
case FF_PROFILE_AAC_LTP:
faac_cfg->aacObjectType = LTP;
break;
default:
av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n");
faacEncClose(s->faac_handle);
return -1;
} |
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faac_cfg->mpegVersion = MPEG4;
faac_cfg->useTns = 0;
faac_cfg->allowMidside = 1; |
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faac_cfg->bitRate = avctx->bit_rate / avctx->channels; |
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faac_cfg->bandWidth = avctx->cutoff; |
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if(avctx->flags & CODEC_FLAG_QSCALE) {
faac_cfg->bitRate = 0;
faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
} |
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faac_cfg->outputFormat = 1; |
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faac_cfg->inputFormat = FAAC_INPUT_16BIT;
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) {
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unsigned char *buffer = NULL; |
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unsigned long decoder_specific_info_size;
if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
&decoder_specific_info_size)) { |
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avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE); |
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avctx->extradata_size = decoder_specific_info_size; |
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memcpy(avctx->extradata, buffer, avctx->extradata_size); |
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faac_cfg->outputFormat = 0; |
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} |
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#undef free
free(buffer);
#define free please_use_av_free |
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}
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if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
return -1;
}
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return 0;
}
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static int Faac_encode_frame(AVCodecContext *avctx,
unsigned char *frame, int buf_size, void *data) |
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{
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;
}
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static av_cold int Faac_encode_close(AVCodecContext *avctx) |
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{
FaacAudioContext *s = avctx->priv_data;
av_freep(&avctx->coded_frame); |
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av_freep(&avctx->extradata); |
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faacEncClose(s->faac_handle);
return 0;
}
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AVCodec libfaac_encoder = {
"libfaac", |
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CODEC_TYPE_AUDIO,
CODEC_ID_AAC,
sizeof(FaacAudioContext),
Faac_encode_init,
Faac_encode_frame, |
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Faac_encode_close, |
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.sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE}, |
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.long_name = NULL_IF_CONFIG_SMALL("libfaac AAC (Advanced Audio Codec)"), |
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}; |