aacenc.c File Reference

AAC encoder. More...

#include "libavutil/float_dsp.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "put_bits.h"
#include "internal.h"
#include "mpeg4audio.h"
#include "kbdwin.h"
#include "sinewin.h"
#include "aac.h"
#include "aactab.h"
#include "aacenc.h"
#include "psymodel.h"

Go to the source code of this file.

Macros
#define	AAC_MAX_CHANNELS   6
#define	ERROR_IF(cond,...)
#define	WINDOW_FUNC(type)
#define	AACENC_FLAGS   AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM

Functions
static void	put_audio_specific_config (AVCodecContext *avctx)
	Make AAC audio config object.
	WINDOW_FUNC (only_long)
	WINDOW_FUNC (long_start)
	WINDOW_FUNC (long_stop)
	WINDOW_FUNC (eight_short)
static void	apply_window_and_mdct (AACEncContext *s, SingleChannelElement *sce, float *audio)
static void	put_ics_info (AACEncContext *s, IndividualChannelStream *info)
	Encode ics_info element.
static void	encode_ms_info (PutBitContext *pb, ChannelElement *cpe)
	Encode MS data.
static void	adjust_frame_information (ChannelElement *cpe, int chans)
	Produce integer coefficients from scalefactors provided by the model.
static void	encode_band_info (AACEncContext *s, SingleChannelElement *sce)
	Encode scalefactor band coding type.
static void	encode_scale_factors (AVCodecContext *avctx, AACEncContext *s, SingleChannelElement *sce)
	Encode scalefactors.
static void	encode_pulses (AACEncContext *s, Pulse *pulse)
	Encode pulse data.
static void	encode_spectral_coeffs (AACEncContext *s, SingleChannelElement *sce)
	Encode spectral coefficients processed by psychoacoustic model.
static int	encode_individual_channel (AVCodecContext *avctx, AACEncContext *s, SingleChannelElement *sce, int common_window)
	Encode one channel of audio data.
static void	put_bitstream_info (AACEncContext *s, const char *name)
	Write some auxiliary information about the created AAC file.
static void	copy_input_samples (AACEncContext *s, const AVFrame *frame)
static int	aac_encode_frame (AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
static av_cold int	aac_encode_end (AVCodecContext *avctx)
static av_cold int	dsp_init (AVCodecContext *avctx, AACEncContext *s)
static av_cold int	alloc_buffers (AVCodecContext *avctx, AACEncContext *s)
static av_cold int	aac_encode_init (AVCodecContext *avctx)

Variables
float	ff_aac_pow34sf_tab [428]
static const uint8_t	swb_size_1024_96 []
static const uint8_t	swb_size_1024_64 []
static const uint8_t	swb_size_1024_48 []
static const uint8_t	swb_size_1024_32 []
static const uint8_t	swb_size_1024_24 []
static const uint8_t	swb_size_1024_16 []
static const uint8_t	swb_size_1024_8 []
static const uint8_t *	swb_size_1024 []
static const uint8_t	swb_size_128_96 []
static const uint8_t	swb_size_128_48 []
static const uint8_t	swb_size_128_24 []
static const uint8_t	swb_size_128_16 []
static const uint8_t	swb_size_128_8 []
static const uint8_t *	swb_size_128 []
static const uint8_t	aac_chan_configs [6][5]
	default channel configurations
static const uint8_t	aac_chan_maps [AAC_MAX_CHANNELS][AAC_MAX_CHANNELS]
	Table to remap channels from libavcodec's default order to AAC order.
static void(*const	apply_window [4])(AVFloatDSPContext *fdsp, SingleChannelElement *sce, const float *audio)
static const AVOption	aacenc_options []
static const AVClass	aacenc_class
static const int	mpeg4audio_sample_rates [16]
AVCodec	ff_aac_encoder

Detailed Description

AAC encoder.

Definition in file aacenc.c.

Macro Definition Documentation

#define AAC_MAX_CHANNELS   6

Definition at line 48 of file aacenc.c.

Referenced by aac_encode_frame(), and aac_encode_init().

#define ERROR_IF	(		cond,
			...
	)

Value:

if (cond) { \
        av_log(avctx, AV_LOG_ERROR, __VA_ARGS__); \
        return AVERROR(EINVAL); \
    }

Definition at line 50 of file aacenc.c.

Referenced by aac_encode_init().

#define WINDOW_FUNC

(

type

)

Value:

static void apply_ ##type ##_window(AVFloatDSPContext *fdsp, \
                                    SingleChannelElement *sce, \
                                    const float *audio)

Definition at line 184 of file aacenc.c.

#define AACENC_FLAGS   AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM

Definition at line 788 of file aacenc.c.

Function Documentation

static void put_audio_specific_config ( AVCodecContext *  avctx )

static

Make AAC audio config object.

See Also

1.6.2.1 "Syntax - AudioSpecificConfig"

Definition at line 163 of file aacenc.c.

Referenced by aac_encode_init().

WINDOW_FUNC

(

only_long

)

Definition at line 189 of file aacenc.c.

WINDOW_FUNC

(

long_start

)

Definition at line 199 of file aacenc.c.

WINDOW_FUNC

(

long_stop

)

Definition at line 211 of file aacenc.c.

WINDOW_FUNC

(

eight_short

)

Definition at line 223 of file aacenc.c.

static void apply_window_and_mdct ( AACEncContext *  s, SingleChannelElement *  sce, float *  audio  )

static

Definition at line 249 of file aacenc.c.

Referenced by aac_encode_frame().

static void put_ics_info ( AACEncContext *  s, IndividualChannelStream *  info  )

static

Encode ics_info element.

See Also

Table 4.6 (syntax of ics_info)

Definition at line 269 of file aacenc.c.

Referenced by aac_encode_frame(), and encode_individual_channel().

static void encode_ms_info ( PutBitContext *  pb, ChannelElement *  cpe  )

static

Encode MS data.

See Also

4.6.8.1 "Joint Coding - M/S Stereo"

Definition at line 290 of file aacenc.c.

Referenced by aac_encode_frame().

static void adjust_frame_information ( ChannelElement *  cpe, int  chans  )

static

Produce integer coefficients from scalefactors provided by the model.

Definition at line 304 of file aacenc.c.

Referenced by aac_encode_frame().

static void encode_band_info ( AACEncContext *  s, SingleChannelElement *  sce  )

static

Encode scalefactor band coding type.

Definition at line 366 of file aacenc.c.

Referenced by encode_individual_channel().

static void encode_scale_factors ( AVCodecContext *  avctx, AACEncContext *  s, SingleChannelElement *  sce  )

static

Encode scalefactors.

Definition at line 377 of file aacenc.c.

Referenced by encode_individual_channel().

static void encode_pulses ( AACEncContext *  s, Pulse *  pulse  )

static

Encode pulse data.

Definition at line 398 of file aacenc.c.

Referenced by encode_individual_channel().

static void encode_spectral_coeffs ( AACEncContext *  s, SingleChannelElement *  sce  )

static

Encode spectral coefficients processed by psychoacoustic model.

Definition at line 417 of file aacenc.c.

Referenced by encode_individual_channel().

static int encode_individual_channel ( AVCodecContext *  avctx, AACEncContext *  s, SingleChannelElement *  sce, int  common_window  )

static

Encode one channel of audio data.

Definition at line 442 of file aacenc.c.

Referenced by aac_encode_frame().

static void put_bitstream_info ( AACEncContext *  s, const char *  name  )

static

Write some auxiliary information about the created AAC file.

Definition at line 461 of file aacenc.c.

Referenced by aac_encode_frame().

static void copy_input_samples ( AACEncContext *  s, const AVFrame *  frame  )

static

Definition at line 482 of file aacenc.c.

Referenced by aac_encode_frame().

static int aac_encode_frame ( AVCodecContext *  avctx, AVPacket *  avpkt, const AVFrame *  frame, int *  got_packet_ptr  )

static

Definition at line 504 of file aacenc.c.

static av_cold int aac_encode_end ( AVCodecContext *  avctx )

static

Definition at line 670 of file aacenc.c.

Referenced by aac_encode_init().

static av_cold int dsp_init ( AVCodecContext *  avctx, AACEncContext *  s  )

static

Definition at line 685 of file aacenc.c.

Referenced by aac_encode_init().

static av_cold int alloc_buffers ( AVCodecContext *  avctx, AACEncContext *  s  )

static

Definition at line 705 of file aacenc.c.

Referenced by aac_encode_init().

static av_cold int aac_encode_init ( AVCodecContext *  avctx )

static

Definition at line 720 of file aacenc.c.

Variable Documentation

float ff_aac_pow34sf_tab[428]

Definition at line 56 of file aacenc.c.

Referenced by aac_encode_init(), and quantize_and_encode_band_cost_template().

const uint8_t swb_size_1024_96[]

static

Initial value:

= {
    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 8, 8, 8, 8, 8,
    12, 12, 12, 12, 12, 16, 16, 24, 28, 36, 44,
    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
}

Definition at line 58 of file aacenc.c.

const uint8_t swb_size_1024_64[]

static

Initial value:

= {
    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 8, 8, 8, 8,
    12, 12, 12, 16, 16, 16, 20, 24, 24, 28, 36,
    40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40
}

Definition at line 64 of file aacenc.c.

const uint8_t swb_size_1024_48[]

static

Initial value:

= {
    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 8, 8, 8, 8, 8, 8, 8,
    12, 12, 12, 12, 16, 16, 20, 20, 24, 24, 28, 28,
    32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
    96
}

Definition at line 70 of file aacenc.c.

const uint8_t swb_size_1024_32[]

static

Initial value:

= {
    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 8, 8, 8, 8, 8, 8, 8,
    12, 12, 12, 12, 16, 16, 20, 20, 24, 24, 28, 28,
    32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32
}

Definition at line 77 of file aacenc.c.

const uint8_t swb_size_1024_24[]

static

Initial value:

= {
    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
    12, 12, 12, 12, 16, 16, 16, 20, 20, 24, 24, 28, 28,
    32, 36, 36, 40, 44, 48, 52, 52, 64, 64, 64, 64, 64
}

Definition at line 83 of file aacenc.c.

const uint8_t swb_size_1024_16[]

static

Initial value:

= {
    8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
    12, 12, 12, 12, 12, 12, 12, 12, 12, 16, 16, 16, 16, 20, 20, 20, 24, 24, 28, 28,
    32, 36, 40, 40, 44, 48, 52, 56, 60, 64, 64, 64
}

Definition at line 89 of file aacenc.c.

const uint8_t swb_size_1024_8[]

static

Initial value:

= {
    12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
    16, 16, 16, 16, 16, 16, 16, 20, 20, 20, 20, 24, 24, 24, 28, 28,
    32, 36, 36, 40, 44, 48, 52, 56, 60, 64, 80
}

Definition at line 95 of file aacenc.c.

const uint8_t* swb_size_1024[]

static

Initial value:

= {
    swb_size_1024_96, swb_size_1024_96, swb_size_1024_64,
    swb_size_1024_48, swb_size_1024_48, swb_size_1024_32,
    swb_size_1024_24, swb_size_1024_24, swb_size_1024_16,
    swb_size_1024_16, swb_size_1024_16, swb_size_1024_8
}

Definition at line 101 of file aacenc.c.

Referenced by aac_encode_init().

const uint8_t swb_size_128_96[]

static

Initial value:

= {
    4, 4, 4, 4, 4, 4, 8, 8, 8, 16, 28, 36
}

Definition at line 108 of file aacenc.c.

const uint8_t swb_size_128_48[]

static

Initial value:

= {
    4, 4, 4, 4, 4, 8, 8, 8, 12, 12, 12, 16, 16, 16
}

Definition at line 112 of file aacenc.c.

const uint8_t swb_size_128_24[]

static

Initial value:

= {
    4, 4, 4, 4, 4, 4, 4, 8, 8, 8, 12, 12, 16, 16, 20
}

Definition at line 116 of file aacenc.c.

const uint8_t swb_size_128_16[]

static

Initial value:

= {
    4, 4, 4, 4, 4, 4, 4, 4, 8, 8, 12, 12, 16, 20, 20
}

Definition at line 120 of file aacenc.c.

const uint8_t swb_size_128_8[]

static

Initial value:

= {
    4, 4, 4, 4, 4, 4, 4, 8, 8, 8, 8, 12, 16, 20, 20
}

Definition at line 124 of file aacenc.c.

const uint8_t* swb_size_128[]

static

Initial value:

= {
    
    swb_size_128_96, swb_size_128_96, swb_size_128_96,
    swb_size_128_48, swb_size_128_48, swb_size_128_48,
    swb_size_128_24, swb_size_128_24, swb_size_128_16,
    swb_size_128_16, swb_size_128_16, swb_size_128_8
}

Definition at line 128 of file aacenc.c.

Referenced by aac_encode_init().

const uint8_t aac_chan_configs[6][5]

static

Initial value:

= {
 {1, TYPE_SCE},                               
 {1, TYPE_CPE},                               
 {2, TYPE_SCE, TYPE_CPE},                     
 {3, TYPE_SCE, TYPE_CPE, TYPE_SCE},           
 {3, TYPE_SCE, TYPE_CPE, TYPE_CPE},           
 {4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_LFE}, 
}

default channel configurations

Definition at line 138 of file aacenc.c.

Referenced by aac_encode_init().

const uint8_t aac_chan_maps[AAC_MAX_CHANNELS][AAC_MAX_CHANNELS]

static

Initial value:

= {
    { 0 },
    { 0, 1 },
    { 2, 0, 1 },
    { 2, 0, 1, 3 },
    { 2, 0, 1, 3, 4 },
    { 2, 0, 1, 4, 5, 3 },
}

Table to remap channels from libavcodec's default order to AAC order.

Definition at line 150 of file aacenc.c.

Referenced by copy_input_samples().

void(*const apply_window[4])(AVFloatDSPContext *fdsp, SingleChannelElement *sce, const float *audio)

static

Initial value:

= {
    [ONLY_LONG_SEQUENCE]   = apply_only_long_window,
    [LONG_START_SEQUENCE]  = apply_long_start_window,
    [EIGHT_SHORT_SEQUENCE] = apply_eight_short_window,
    [LONG_STOP_SEQUENCE]   = apply_long_stop_window
}

Definition at line 240 of file aacenc.c.

Referenced by apply_window_and_mdct(), and ff_mpa_synth_filter_TMPL().

const AVOption aacenc_options[]

static

Initial value:

= {
    {"stereo_mode", "Stereo coding method", 0x42, AV_OPT_TYPE_INT, {.i64 = 0}, -1, 1, AACENC_FLAGS, "stereo_mode"},
        {"auto",     "Selected by the Encoder", 0, AV_OPT_TYPE_CONST, {.i64 = -1 }, INT_MIN, INT_MAX, AACENC_FLAGS, "stereo_mode"},
        {"ms_off",   "Disable Mid/Side coding", 0, AV_OPT_TYPE_CONST, {.i64 =  0 }, INT_MIN, INT_MAX, AACENC_FLAGS, "stereo_mode"},
        {"ms_force", "Force Mid/Side for the whole frame if possible", 0, AV_OPT_TYPE_CONST, {.i64 =  1 }, INT_MIN, INT_MAX, AACENC_FLAGS, "stereo_mode"},
    {"aac_coder", "", 0x42, AV_OPT_TYPE_INT, {.i64 = AAC_CODER_TWOLOOP}, 0, AAC_CODER_NB-1, AACENC_FLAGS, "aac_coder"},
        {"faac",     "FAAC-inspired method",      0, AV_OPT_TYPE_CONST, {.i64 = AAC_CODER_FAAC},    INT_MIN, INT_MAX, AACENC_FLAGS, "aac_coder"},
        {"anmr",     "ANMR method",               0, AV_OPT_TYPE_CONST, {.i64 = AAC_CODER_ANMR},    INT_MIN, INT_MAX, AACENC_FLAGS, "aac_coder"},
        {"twoloop",  "Two loop searching method", 0, AV_OPT_TYPE_CONST, {.i64 = AAC_CODER_TWOLOOP}, INT_MIN, INT_MAX, AACENC_FLAGS, "aac_coder"},
        {"fast",     "Constant quantizer",        0, AV_OPT_TYPE_CONST, {.i64 = AAC_CODER_FAST},    INT_MIN, INT_MAX, AACENC_FLAGS, "aac_coder"},
    {NULL}
}

Definition at line 789 of file aacenc.c.

const AVClass aacenc_class

static

Initial value:

= {
    "AAC encoder",
    av_default_item_name,
    aacenc_options,
    LIBAVUTIL_VERSION_INT,
}

Definition at line 802 of file aacenc.c.

const int mpeg4audio_sample_rates[16]

static

Initial value:

= {
    96000, 88200, 64000, 48000, 44100, 32000,
    24000, 22050, 16000, 12000, 11025, 8000, 7350
}

Definition at line 811 of file aacenc.c.

AVCodec ff_aac_encoder

Initial value:

= {
    .name           = "aac",
    .long_name      = NULL_IF_CONFIG_SMALL("AAC (Advanced Audio Coding)"),
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_AAC,
    .priv_data_size = sizeof(AACEncContext),
    .init           = aac_encode_init,
    .encode2        = aac_encode_frame,
    .close          = aac_encode_end,
    .supported_samplerates = mpeg4audio_sample_rates,
    .capabilities   = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY |
                      CODEC_CAP_EXPERIMENTAL,
    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
                                                     AV_SAMPLE_FMT_NONE },
    .priv_class     = &aacenc_class,
}

Definition at line 816 of file aacenc.c.