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/*
* AAC encoder wrapper
* Copyright ( c ) 2012 Martin Storsjo
*
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* This file is part of FFmpeg .
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*
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* 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
* version 2.1 of the License , or ( at your option ) any later version .
*
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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
*/
# include <fdk-aac/aacenc_lib.h>
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# include "libavutil/channel_layout.h"
# include "libavutil/common.h"
# include "libavutil/opt.h"
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# include "avcodec.h"
# include "audio_frame_queue.h"
# include "internal.h"
typedef struct AACContext {
const AVClass * class ;
HANDLE_AACENCODER handle ;
int afterburner ;
int eld_sbr ;
int signaling ;
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int latm ;
int header_period ;
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int vbr ;
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AudioFrameQueue afq ;
} AACContext ;
static const AVOption aac_enc_options [ ] = {
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{ " afterburner " , " Afterburner (improved quality) " , offsetof ( AACContext , afterburner ) , AV_OPT_TYPE_INT , { . i64 = 1 } , 0 , 1 , AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM } ,
{ " eld_sbr " , " Enable SBR for ELD (for SBR in other configurations, use the -profile parameter) " , offsetof ( AACContext , eld_sbr ) , AV_OPT_TYPE_INT , { . i64 = 0 } , 0 , 1 , AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM } ,
{ " signaling " , " SBR/PS signaling style " , offsetof ( AACContext , signaling ) , AV_OPT_TYPE_INT , { . i64 = - 1 } , - 1 , 2 , AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM , " signaling " } ,
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{ " default " , " Choose signaling implicitly (explicit hierarchical by default, implicit if global header is disabled) " , 0 , AV_OPT_TYPE_CONST , { . i64 = - 1 } , 0 , 0 , AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM , " signaling " } ,
{ " implicit " , " Implicit backwards compatible signaling " , 0 , AV_OPT_TYPE_CONST , { . i64 = 0 } , 0 , 0 , AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM , " signaling " } ,
{ " explicit_sbr " , " Explicit SBR, implicit PS signaling " , 0 , AV_OPT_TYPE_CONST , { . i64 = 1 } , 0 , 0 , AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM , " signaling " } ,
{ " explicit_hierarchical " , " Explicit hierarchical signaling " , 0 , AV_OPT_TYPE_CONST , { . i64 = 2 } , 0 , 0 , AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM , " signaling " } ,
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{ " latm " , " Output LATM/LOAS encapsulated data " , offsetof ( AACContext , latm ) , AV_OPT_TYPE_INT , { . i64 = 0 } , 0 , 1 , AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM } ,
{ " header_period " , " StreamMuxConfig and PCE repetition period (in frames) " , offsetof ( AACContext , header_period ) , AV_OPT_TYPE_INT , { . i64 = 0 } , 0 , 0xffff , AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM } ,
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{ " vbr " , " VBR mode (1-5) " , offsetof ( AACContext , vbr ) , AV_OPT_TYPE_INT , { . i64 = 0 } , 0 , 5 , AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM } ,
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{ NULL }
} ;
static const AVClass aac_enc_class = {
" libfdk_aac " , av_default_item_name , aac_enc_options , LIBAVUTIL_VERSION_INT
} ;
static const char * aac_get_error ( AACENC_ERROR err )
{
switch ( err ) {
case AACENC_OK :
return " No error " ;
case AACENC_INVALID_HANDLE :
return " Invalid handle " ;
case AACENC_MEMORY_ERROR :
return " Memory allocation error " ;
case AACENC_UNSUPPORTED_PARAMETER :
return " Unsupported parameter " ;
case AACENC_INVALID_CONFIG :
return " Invalid config " ;
case AACENC_INIT_ERROR :
return " Initialization error " ;
case AACENC_INIT_AAC_ERROR :
return " AAC library initialization error " ;
case AACENC_INIT_SBR_ERROR :
return " SBR library initialization error " ;
case AACENC_INIT_TP_ERROR :
return " Transport library initialization error " ;
case AACENC_INIT_META_ERROR :
return " Metadata library initialization error " ;
case AACENC_ENCODE_ERROR :
return " Encoding error " ;
case AACENC_ENCODE_EOF :
return " End of file " ;
default :
return " Unknown error " ;
}
}
static int aac_encode_close ( AVCodecContext * avctx )
{
AACContext * s = avctx - > priv_data ;
if ( s - > handle )
aacEncClose ( & s - > handle ) ;
av_freep ( & avctx - > extradata ) ;
ff_af_queue_close ( & s - > afq ) ;
return 0 ;
}
static av_cold int aac_encode_init ( AVCodecContext * avctx )
{
AACContext * s = avctx - > priv_data ;
int ret = AVERROR ( EINVAL ) ;
AACENC_InfoStruct info = { 0 } ;
CHANNEL_MODE mode ;
AACENC_ERROR err ;
int aot = FF_PROFILE_AAC_LOW + 1 ;
int sce = 0 , cpe = 0 ;
if ( ( err = aacEncOpen ( & s - > handle , 0 , avctx - > channels ) ) ! = AACENC_OK ) {
av_log ( avctx , AV_LOG_ERROR , " Unable to open the encoder: %s \n " ,
aac_get_error ( err ) ) ;
goto error ;
}
if ( avctx - > profile ! = FF_PROFILE_UNKNOWN )
aot = avctx - > profile + 1 ;
if ( ( err = aacEncoder_SetParam ( s - > handle , AACENC_AOT , aot ) ) ! = AACENC_OK ) {
av_log ( avctx , AV_LOG_ERROR , " Unable to set the AOT %d: %s \n " ,
aot , aac_get_error ( err ) ) ;
goto error ;
}
if ( aot = = FF_PROFILE_AAC_ELD + 1 & & s - > eld_sbr ) {
if ( ( err = aacEncoder_SetParam ( s - > handle , AACENC_SBR_MODE ,
1 ) ) ! = AACENC_OK ) {
av_log ( avctx , AV_LOG_ERROR , " Unable to enable SBR for ELD: %s \n " ,
aac_get_error ( err ) ) ;
goto error ;
}
}
if ( ( err = aacEncoder_SetParam ( s - > handle , AACENC_SAMPLERATE ,
avctx - > sample_rate ) ) ! = AACENC_OK ) {
av_log ( avctx , AV_LOG_ERROR , " Unable to set the sample rate %d: %s \n " ,
avctx - > sample_rate , aac_get_error ( err ) ) ;
goto error ;
}
switch ( avctx - > channels ) {
case 1 : mode = MODE_1 ; sce = 1 ; cpe = 0 ; break ;
case 2 : mode = MODE_2 ; sce = 0 ; cpe = 1 ; break ;
case 3 : mode = MODE_1_2 ; sce = 1 ; cpe = 1 ; break ;
case 4 : mode = MODE_1_2_1 ; sce = 2 ; cpe = 1 ; break ;
case 5 : mode = MODE_1_2_2 ; sce = 1 ; cpe = 2 ; break ;
case 6 : mode = MODE_1_2_2_1 ; sce = 2 ; cpe = 2 ; break ;
default :
av_log ( avctx , AV_LOG_ERROR ,
" Unsupported number of channels %d \n " , avctx - > channels ) ;
goto error ;
}
if ( ( err = aacEncoder_SetParam ( s - > handle , AACENC_CHANNELMODE ,
mode ) ) ! = AACENC_OK ) {
av_log ( avctx , AV_LOG_ERROR ,
" Unable to set channel mode %d: %s \n " , mode , aac_get_error ( err ) ) ;
goto error ;
}
if ( ( err = aacEncoder_SetParam ( s - > handle , AACENC_CHANNELORDER ,
1 ) ) ! = AACENC_OK ) {
av_log ( avctx , AV_LOG_ERROR ,
" Unable to set wav channel order %d: %s \n " ,
mode , aac_get_error ( err ) ) ;
goto error ;
}
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if ( avctx - > flags & CODEC_FLAG_QSCALE | | s - > vbr ) {
int mode = s - > vbr ? s - > vbr : avctx - > global_quality ;
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if ( mode < 1 | | mode > 5 ) {
av_log ( avctx , AV_LOG_WARNING ,
" VBR quality %d out of range, should be 1-5 \n " , mode ) ;
mode = av_clip ( mode , 1 , 5 ) ;
}
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av_log ( avctx , AV_LOG_WARNING ,
" Note, the VBR setting is unsupported and only works with "
" some parameter combinations \n " ) ;
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if ( ( err = aacEncoder_SetParam ( s - > handle , AACENC_BITRATEMODE ,
mode ) ) ! = AACENC_OK ) {
av_log ( avctx , AV_LOG_ERROR , " Unable to set the VBR bitrate mode %d: %s \n " ,
mode , aac_get_error ( err ) ) ;
goto error ;
}
} else {
if ( avctx - > bit_rate < = 0 ) {
if ( avctx - > profile = = FF_PROFILE_AAC_HE_V2 ) {
sce = 1 ;
cpe = 0 ;
}
avctx - > bit_rate = ( 96 * sce + 128 * cpe ) * avctx - > sample_rate / 44 ;
if ( avctx - > profile = = FF_PROFILE_AAC_HE | |
avctx - > profile = = FF_PROFILE_AAC_HE_V2 | |
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avctx - > profile = = FF_PROFILE_MPEG2_AAC_HE | |
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s - > eld_sbr )
avctx - > bit_rate / = 2 ;
}
if ( ( err = aacEncoder_SetParam ( s - > handle , AACENC_BITRATE ,
avctx - > bit_rate ) ) ! = AACENC_OK ) {
av_log ( avctx , AV_LOG_ERROR , " Unable to set the bitrate %d: %s \n " ,
avctx - > bit_rate , aac_get_error ( err ) ) ;
goto error ;
}
}
/* Choose bitstream format - if global header is requested, use
* raw access units , otherwise use ADTS . */
if ( ( err = aacEncoder_SetParam ( s - > handle , AACENC_TRANSMUX ,
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avctx - > flags & CODEC_FLAG_GLOBAL_HEADER ? 0 : s - > latm ? 10 : 2 ) ) ! = AACENC_OK ) {
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av_log ( avctx , AV_LOG_ERROR , " Unable to set the transmux format: %s \n " ,
aac_get_error ( err ) ) ;
goto error ;
}
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if ( s - > latm & & s - > header_period ) {
if ( ( err = aacEncoder_SetParam ( s - > handle , AACENC_HEADER_PERIOD ,
s - > header_period ) ) ! = AACENC_OK ) {
av_log ( avctx , AV_LOG_ERROR , " Unable to set header period: %s \n " ,
aac_get_error ( err ) ) ;
goto error ;
}
}
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/* If no signaling mode is chosen, use explicit hierarchical signaling
* if using mp4 mode ( raw access units , with global header ) and
* implicit signaling if using ADTS . */
if ( s - > signaling < 0 )
s - > signaling = avctx - > flags & CODEC_FLAG_GLOBAL_HEADER ? 2 : 0 ;
if ( ( err = aacEncoder_SetParam ( s - > handle , AACENC_SIGNALING_MODE ,
s - > signaling ) ) ! = AACENC_OK ) {
av_log ( avctx , AV_LOG_ERROR , " Unable to set signaling mode %d: %s \n " ,
s - > signaling , aac_get_error ( err ) ) ;
goto error ;
}
if ( ( err = aacEncoder_SetParam ( s - > handle , AACENC_AFTERBURNER ,
s - > afterburner ) ) ! = AACENC_OK ) {
av_log ( avctx , AV_LOG_ERROR , " Unable to set afterburner to %d: %s \n " ,
s - > afterburner , aac_get_error ( err ) ) ;
goto error ;
}
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if ( avctx - > cutoff > 0 ) {
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if ( avctx - > cutoff < ( avctx - > sample_rate + 255 ) > > 8 | | avctx - > cutoff > 20000 ) {
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av_log ( avctx , AV_LOG_ERROR , " cutoff valid range is %d-20000 \n " ,
( avctx - > sample_rate + 255 ) > > 8 ) ;
goto error ;
}
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if ( ( err = aacEncoder_SetParam ( s - > handle , AACENC_BANDWIDTH ,
avctx - > cutoff ) ) ! = AACENC_OK ) {
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av_log ( avctx , AV_LOG_ERROR , " Unable to set the encoder bandwidth to %d: %s \n " ,
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avctx - > cutoff , aac_get_error ( err ) ) ;
goto error ;
}
}
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if ( ( err = aacEncEncode ( s - > handle , NULL , NULL , NULL , NULL ) ) ! = AACENC_OK ) {
av_log ( avctx , AV_LOG_ERROR , " Unable to initialize the encoder: %s \n " ,
aac_get_error ( err ) ) ;
return AVERROR ( EINVAL ) ;
}
if ( ( err = aacEncInfo ( s - > handle , & info ) ) ! = AACENC_OK ) {
av_log ( avctx , AV_LOG_ERROR , " Unable to get encoder info: %s \n " ,
aac_get_error ( err ) ) ;
goto error ;
}
avctx - > frame_size = info . frameLength ;
avctx - > delay = info . encoderDelay ;
ff_af_queue_init ( avctx , & s - > afq ) ;
if ( avctx - > flags & CODEC_FLAG_GLOBAL_HEADER ) {
avctx - > extradata_size = info . confSize ;
avctx - > extradata = av_mallocz ( avctx - > extradata_size +
FF_INPUT_BUFFER_PADDING_SIZE ) ;
if ( ! avctx - > extradata ) {
ret = AVERROR ( ENOMEM ) ;
goto error ;
}
memcpy ( avctx - > extradata , info . confBuf , info . confSize ) ;
}
return 0 ;
error :
aac_encode_close ( avctx ) ;
return ret ;
}
static int aac_encode_frame ( AVCodecContext * avctx , AVPacket * avpkt ,
const AVFrame * frame , int * got_packet_ptr )
{
AACContext * s = avctx - > priv_data ;
AACENC_BufDesc in_buf = { 0 } , out_buf = { 0 } ;
AACENC_InArgs in_args = { 0 } ;
AACENC_OutArgs out_args = { 0 } ;
int in_buffer_identifier = IN_AUDIO_DATA ;
int in_buffer_size , in_buffer_element_size ;
int out_buffer_identifier = OUT_BITSTREAM_DATA ;
int out_buffer_size , out_buffer_element_size ;
void * in_ptr , * out_ptr ;
int ret ;
AACENC_ERROR err ;
/* handle end-of-stream small frame and flushing */
if ( ! frame ) {
in_args . numInSamples = - 1 ;
} else {
in_ptr = frame - > data [ 0 ] ;
in_buffer_size = 2 * avctx - > channels * frame - > nb_samples ;
in_buffer_element_size = 2 ;
in_args . numInSamples = avctx - > channels * frame - > nb_samples ;
in_buf . numBufs = 1 ;
in_buf . bufs = & in_ptr ;
in_buf . bufferIdentifiers = & in_buffer_identifier ;
in_buf . bufSizes = & in_buffer_size ;
in_buf . bufElSizes = & in_buffer_element_size ;
/* add current frame to the queue */
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if ( ( ret = ff_af_queue_add ( & s - > afq , frame ) ) < 0 )
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return ret ;
}
/* The maximum packet size is 6144 bits aka 768 bytes per channel. */
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if ( ( ret = ff_alloc_packet2 ( avctx , avpkt , FFMAX ( 8192 , 768 * avctx - > channels ) ) ) < 0 )
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return ret ;
out_ptr = avpkt - > data ;
out_buffer_size = avpkt - > size ;
out_buffer_element_size = 1 ;
out_buf . numBufs = 1 ;
out_buf . bufs = & out_ptr ;
out_buf . bufferIdentifiers = & out_buffer_identifier ;
out_buf . bufSizes = & out_buffer_size ;
out_buf . bufElSizes = & out_buffer_element_size ;
if ( ( err = aacEncEncode ( s - > handle , & in_buf , & out_buf , & in_args ,
& out_args ) ) ! = AACENC_OK ) {
if ( ! frame & & err = = AACENC_ENCODE_EOF )
return 0 ;
av_log ( avctx , AV_LOG_ERROR , " Unable to encode frame: %s \n " ,
aac_get_error ( err ) ) ;
return AVERROR ( EINVAL ) ;
}
if ( ! out_args . numOutBytes )
return 0 ;
/* Get the next frame pts & duration */
ff_af_queue_remove ( & s - > afq , avctx - > frame_size , & avpkt - > pts ,
& avpkt - > duration ) ;
avpkt - > size = out_args . numOutBytes ;
* got_packet_ptr = 1 ;
return 0 ;
}
static const AVProfile profiles [ ] = {
{ FF_PROFILE_AAC_LOW , " LC " } ,
{ FF_PROFILE_AAC_HE , " HE-AAC " } ,
{ FF_PROFILE_AAC_HE_V2 , " HE-AACv2 " } ,
{ FF_PROFILE_AAC_LD , " LD " } ,
{ FF_PROFILE_AAC_ELD , " ELD " } ,
{ FF_PROFILE_UNKNOWN } ,
} ;
static const AVCodecDefault aac_encode_defaults [ ] = {
{ " b " , " 0 " } ,
{ NULL }
} ;
static const uint64_t aac_channel_layout [ ] = {
AV_CH_LAYOUT_MONO ,
AV_CH_LAYOUT_STEREO ,
AV_CH_LAYOUT_SURROUND ,
AV_CH_LAYOUT_4POINT0 ,
AV_CH_LAYOUT_5POINT0_BACK ,
AV_CH_LAYOUT_5POINT1_BACK ,
0 ,
} ;
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static const int aac_sample_rates [ ] = {
96000 , 88200 , 64000 , 48000 , 44100 , 32000 ,
24000 , 22050 , 16000 , 12000 , 11025 , 8000 , 0
} ;
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AVCodec ff_libfdk_aac_encoder = {
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. name = " libfdk_aac " ,
. type = AVMEDIA_TYPE_AUDIO ,
. id = AV_CODEC_ID_AAC ,
. priv_data_size = sizeof ( AACContext ) ,
. init = aac_encode_init ,
. encode2 = aac_encode_frame ,
. close = aac_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 ( " Fraunhofer FDK AAC " ) ,
. priv_class = & aac_enc_class ,
. defaults = aac_encode_defaults ,
. profiles = profiles ,
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. supported_samplerates = aac_sample_rates ,
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. channel_layouts = aac_channel_layout ,
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} ;