aacenc.c File Reference

#include <float.h>
#include "libavutil/libm.h"
#include "libavutil/thread.h"
#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 "aacenctab.h"
#include "aacenc_utils.h"
#include "psymodel.h"

Go to the source code of this file.

Macros
#define	WINDOW_FUNC(type)
#define	AACENC_FLAGS   AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM

Functions
static void	put_pce (PutBitContext *pb, AVCodecContext *avctx)
static int	put_audio_specific_config (AVCodecContext *avctx)
	Make AAC audio config object. More...
void	ff_quantize_band_cost_cache_init (struct AACEncContext *s)
	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. More...
static void	encode_ms_info (PutBitContext *pb, ChannelElement *cpe)
	Encode MS data. More...
static void	adjust_frame_information (ChannelElement *cpe, int chans)
	Produce integer coefficients from scalefactors provided by the model. More...
static void	apply_intensity_stereo (ChannelElement *cpe)
static void	apply_mid_side_stereo (ChannelElement *cpe)
static void	encode_band_info (AACEncContext *s, SingleChannelElement *sce)
	Encode scalefactor band coding type. More...
static void	encode_scale_factors (AVCodecContext *avctx, AACEncContext *s, SingleChannelElement *sce)
	Encode scalefactors. More...
static void	encode_pulses (AACEncContext *s, Pulse *pulse)
	Encode pulse data. More...
static void	encode_spectral_coeffs (AACEncContext *s, SingleChannelElement *sce)
	Encode spectral coefficients processed by psychoacoustic model. More...
static void	avoid_clipping (AACEncContext *s, SingleChannelElement *sce)
	Downscale spectral coefficients for near-clipping windows to avoid artifacts. More...
static int	encode_individual_channel (AVCodecContext *avctx, AACEncContext *s, SingleChannelElement *sce, int common_window)
	Encode one channel of audio data. More...
static void	put_bitstream_info (AACEncContext *s, const char *name)
	Write some auxiliary information about the created AAC file. More...
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 void	aac_encode_init_tables (void)
static av_cold int	aac_encode_init (AVCodecContext *avctx)

Variables
static AVOnce	aac_table_init = AV_ONCE_INIT
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 AVCodecDefault	aac_encode_defaults []
AVCodec	ff_aac_encoder

Detailed Description

AAC encoder

Definition in file aacenc.c.

Macro Definition Documentation

WINDOW_FUNC

#define WINDOW_FUNC

(

type

)

Value:

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

Definition at line 136 of file aacenc.c.

AACENC_FLAGS

#define AACENC_FLAGS   AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM

Definition at line 1122 of file aacenc.c.

Function Documentation

put_pce()

static void put_pce ( PutBitContext *  pb, AVCodecContext *  avctx  )

static

Definition at line 54 of file aacenc.c.

Referenced by put_audio_specific_config().

put_audio_specific_config()

static int put_audio_specific_config ( AVCodecContext *  avctx )

static

Make AAC audio config object.

See also

1.6.2.1 "Syntax - AudioSpecificConfig"

Definition at line 95 of file aacenc.c.

Referenced by aac_encode_init().

ff_quantize_band_cost_cache_init()

void ff_quantize_band_cost_cache_init

(

struct AACEncContext *

s

)

Definition at line 127 of file aacenc.c.

Referenced by search_for_quantizers_fast(), and search_for_quantizers_twoloop().

WINDOW_FUNC() [1/4]

WINDOW_FUNC

(

only_long

)

Definition at line 141 of file aacenc.c.

WINDOW_FUNC() [2/4]

WINDOW_FUNC

(

long_start

)

Definition at line 151 of file aacenc.c.

WINDOW_FUNC() [3/4]

WINDOW_FUNC

(

long_stop

)

Definition at line 163 of file aacenc.c.

WINDOW_FUNC() [4/4]

WINDOW_FUNC

(

eight_short

)

Definition at line 175 of file aacenc.c.

apply_window_and_mdct()

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

static

Definition at line 201 of file aacenc.c.

Referenced by aac_encode_frame().

put_ics_info()

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 222 of file aacenc.c.

Referenced by aac_encode_frame(), and encode_individual_channel().

encode_ms_info()

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 243 of file aacenc.c.

Referenced by aac_encode_frame().

adjust_frame_information()

static void adjust_frame_information ( ChannelElement *  cpe, int  chans  )

static

Produce integer coefficients from scalefactors provided by the model.

Definition at line 257 of file aacenc.c.

Referenced by aac_encode_frame().

apply_intensity_stereo()

static void apply_intensity_stereo ( ChannelElement *  cpe )

static

Definition at line 307 of file aacenc.c.

Referenced by aac_encode_frame().

apply_mid_side_stereo()

static void apply_mid_side_stereo ( ChannelElement *  cpe )

static

Definition at line 336 of file aacenc.c.

Referenced by aac_encode_frame().

encode_band_info()

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

static

Encode scalefactor band coding type.

Definition at line 371 of file aacenc.c.

Referenced by encode_individual_channel().

encode_scale_factors()

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

static

Encode scalefactors.

Definition at line 385 of file aacenc.c.

Referenced by encode_individual_channel().

encode_pulses()

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

static

Encode pulse data.

Definition at line 421 of file aacenc.c.

Referenced by encode_individual_channel().

encode_spectral_coeffs()

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

static

Encode spectral coefficients processed by psychoacoustic model.

Definition at line 440 of file aacenc.c.

Referenced by encode_individual_channel().

avoid_clipping()

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

static

Downscale spectral coefficients for near-clipping windows to avoid artifacts.

Definition at line 468 of file aacenc.c.

Referenced by aac_encode_frame().

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 488 of file aacenc.c.

Referenced by aac_encode_frame().

put_bitstream_info()

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

static

Write some auxiliary information about the created AAC file.

Definition at line 514 of file aacenc.c.

Referenced by aac_encode_frame().

copy_input_samples()

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

static

Definition at line 535 of file aacenc.c.

Referenced by aac_encode_frame().

aac_encode_frame()

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

static

Definition at line 557 of file aacenc.c.

aac_encode_end()

static av_cold int aac_encode_end ( AVCodecContext *  avctx )

static

Definition at line 900 of file aacenc.c.

Referenced by aac_encode_init().

dsp_init()

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

static

Definition at line 919 of file aacenc.c.

Referenced by aac_encode_init().

alloc_buffers()

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

static

Definition at line 941 of file aacenc.c.

Referenced by aac_encode_init().

aac_encode_init_tables()

static av_cold void aac_encode_init_tables ( void  )

static

Definition at line 955 of file aacenc.c.

Referenced by aac_encode_init().

aac_encode_init()

static av_cold int aac_encode_init ( AVCodecContext *  avctx )

static

Definition at line 960 of file aacenc.c.

Variable Documentation

aac_table_init

AVOnce aac_table_init = AV_ONCE_INIT

static

Definition at line 52 of file aacenc.c.

Referenced by aac_encode_init().

apply_window

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 192 of file aacenc.c.

Referenced by aac_encode_frame(), apply_window_and_mdct(), and ff_mpa_synth_filter_TMPL().

aacenc_options

const AVOption aacenc_options[]

static

Initial value:

= {
    {"aac_coder", "Coding algorithm", 0x42, AV_OPT_TYPE_INT, {.i64 = AAC_CODER_FAST}, 0, AAC_CODER_NB-1, AACENC_FLAGS, "coder"},
        {"anmr",     "ANMR method",               0, AV_OPT_TYPE_CONST, {.i64 = AAC_CODER_ANMR},    INT_MIN, INT_MAX, AACENC_FLAGS, "coder"},
        {"twoloop",  "Two loop searching method", 0, AV_OPT_TYPE_CONST, {.i64 = AAC_CODER_TWOLOOP}, INT_MIN, INT_MAX, AACENC_FLAGS, "coder"},
        {"fast",     "Default fast search",       0, AV_OPT_TYPE_CONST, {.i64 = AAC_CODER_FAST},    INT_MIN, INT_MAX, AACENC_FLAGS, "coder"},
    {"aac_ms", "Force M/S stereo coding", 0x42, AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, AACENC_FLAGS},
    {"aac_is", "Intensity stereo coding", 0x42, AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AACENC_FLAGS},
    {"aac_pns", "Perceptual noise substitution", 0x42, AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AACENC_FLAGS},
    {"aac_tns", "Temporal noise shaping", 0x42, AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AACENC_FLAGS},
    {"aac_ltp", "Long term prediction", 0x42, AV_OPT_TYPE_BOOL, {.i64 = 0}, -1, 1, AACENC_FLAGS},
    {"aac_pred", "AAC-Main prediction", 0x42, AV_OPT_TYPE_BOOL, {.i64 = 0}, -1, 1, AACENC_FLAGS},
    {"aac_pce", "Forces the use of PCEs", 0x42, AV_OPT_TYPE_BOOL, {.i64 = 0}, -1, 1, AACENC_FLAGS},
    {NULL}
}

Definition at line 1123 of file aacenc.c.

aacenc_class

const AVClass aacenc_class

static

Initial value:

= {
    .class_name = "AAC encoder",
    .item_name  = av_default_item_name,
    .option     = aacenc_options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 1138 of file aacenc.c.

aac_encode_defaults

const AVCodecDefault aac_encode_defaults[]

static

Initial value:

= {
    { "b", "0" },
    { NULL }
}

Definition at line 1145 of file aacenc.c.

ff_aac_encoder

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,
    .defaults       = aac_encode_defaults,
    .supported_samplerates = mpeg4audio_sample_rates,
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
    .capabilities   = AV_CODEC_CAP_SMALL_LAST_FRAME | AV_CODEC_CAP_DELAY,
    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
                                                     AV_SAMPLE_FMT_NONE },
    .priv_class     = &aacenc_class,
}

Definition at line 1150 of file aacenc.c.