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/*
* Interface to libfaac for aac encoding
* Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com>
*
* 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 libfaac for aac encoding.
*/
#include "avcodec.h"
#include <faac.h>
typedef struct FaacAudioContext {
faacEncHandle faac_handle;
} FaacAudioContext;
static const int channel_maps[][6] = {
{ 2, 0, 1 }, //< C L R
{ 2, 0, 1, 3 }, //< C L R Cs
{ 2, 0, 1, 3, 4 }, //< C L R Ls Rs
{ 2, 0, 1, 4, 5, 3 }, //< C L R Ls Rs LFE
};
static av_cold 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) {
av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels);
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 */
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;
}
faac_cfg->mpegVersion = MPEG4;
faac_cfg->useTns = 0;
faac_cfg->allowMidside = 1;
faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
faac_cfg->bandWidth = avctx->cutoff;
if(avctx->flags & CODEC_FLAG_QSCALE) {
faac_cfg->bitRate = 0;
faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
}
faac_cfg->outputFormat = 1;
faac_cfg->inputFormat = FAAC_INPUT_16BIT;
if (avctx->channels > 2)
memcpy(faac_cfg->channel_map, channel_maps[avctx->channels-3],
avctx->channels * sizeof(int));
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 = NULL;
unsigned long decoder_specific_info_size;
if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
&decoder_specific_info_size)) {
avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE);
avctx->extradata_size = decoder_specific_info_size;
memcpy(avctx->extradata, buffer, avctx->extradata_size);
faac_cfg->outputFormat = 0;
}
#undef free
free(buffer);
#define free please_use_av_free
}
if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
return -1;
}
return 0;
}
static int Faac_encode_frame(AVCodecContext *avctx,
unsigned char *frame, int buf_size, void *data)
{
FaacAudioContext *s = avctx->priv_data;
int bytes_written;
int num_samples = data ? avctx->frame_size : 0;
bytes_written = faacEncEncode(s->faac_handle,
data,
num_samples * avctx->channels,
frame,
buf_size);
return bytes_written;
}
static av_cold int Faac_encode_close(AVCodecContext *avctx)
{
FaacAudioContext *s = avctx->priv_data;
av_freep(&avctx->coded_frame);
av_freep(&avctx->extradata);
faacEncClose(s->faac_handle);
return 0;
}
static const AVProfile profiles[] = {
{ FF_PROFILE_AAC_MAIN, "Main" },
{ FF_PROFILE_AAC_LOW, "LC" },
{ FF_PROFILE_AAC_SSR, "SSR" },
{ FF_PROFILE_AAC_LTP, "LTP" },
{ FF_PROFILE_UNKNOWN },
};
AVCodec ff_libfaac_encoder = {
.name = "libfaac",
.type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_AAC,
.priv_data_size = sizeof(FaacAudioContext),
.init = Faac_encode_init,
.encode = Faac_encode_frame,
.close = Faac_encode_close,
.capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
.sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
.long_name = NULL_IF_CONFIG_SMALL("libfaac AAC (Advanced Audio Codec)"),
.profiles = NULL_IF_CONFIG_SMALL(profiles),
};
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