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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 WARN_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 WARN_IF (   cond,
  ... 
)
Value:
if (cond) { \
av_log(avctx, AV_LOG_WARNING, __VA_ARGS__); \
}

Definition at line 56 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 191 of file aacenc.c.

#define AACENC_FLAGS   AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM

Definition at line 823 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 170 of file aacenc.c.

Referenced by aac_encode_init().

WINDOW_FUNC ( only_long  )

Definition at line 196 of file aacenc.c.

WINDOW_FUNC ( long_start  )

Definition at line 206 of file aacenc.c.

WINDOW_FUNC ( long_stop  )

Definition at line 218 of file aacenc.c.

WINDOW_FUNC ( eight_short  )

Definition at line 230 of file aacenc.c.

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

Definition at line 256 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 277 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 298 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 312 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 377 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 388 of file aacenc.c.

Referenced by encode_individual_channel().

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

Encode pulse data.

Definition at line 409 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 428 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 453 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 472 of file aacenc.c.

Referenced by aac_encode_frame().

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

Definition at line 493 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 515 of file aacenc.c.

static av_cold int aac_encode_end ( AVCodecContext *  avctx)
static

Definition at line 695 of file aacenc.c.

Referenced by aac_encode_init().

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

Definition at line 711 of file aacenc.c.

Referenced by aac_encode_init().

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

Definition at line 733 of file aacenc.c.

Referenced by aac_encode_init().

static av_cold int aac_encode_init ( AVCodecContext *  avctx)
static

Definition at line 748 of file aacenc.c.

Variable Documentation

float ff_aac_pow34sf_tab[428]

Definition at line 61 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 63 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 69 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 75 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 82 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 88 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 94 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 100 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,
swb_size_1024_8
}

Definition at line 106 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 114 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 118 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 122 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 126 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 130 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,
swb_size_128_8
}

Definition at line 134 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 145 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 157 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 247 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 824 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 837 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 846 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 851 of file aacenc.c.

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