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 "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_audio_specific_config (AVCodecContext *avctx)
	Make AAC audio config object. More...
	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 int	aac_encode_init (AVCodecContext *avctx)

Variables
static void(*const	apply_window [4])(AVFloatDSPContext *fdsp, SingleChannelElement *sce, const float *audio)
static const AVOption	aacenc_options []
static const AVClass	aacenc_class
AVCodec	ff_aac_encoder

Detailed Description

AAC encoder.

Definition in file aacenc.c.

Macro Definition Documentation

#define WINDOW_FUNC

(

type

)

Value:

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

Definition at line 74 of file aacenc.c.

#define AACENC_FLAGS   AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM

Definition at line 876 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 53 of file aacenc.c.

Referenced by aac_encode_init().

WINDOW_FUNC

(

only_long

)

Definition at line 79 of file aacenc.c.

WINDOW_FUNC

(

long_start

)

Definition at line 89 of file aacenc.c.

WINDOW_FUNC

(

long_stop

)

Definition at line 101 of file aacenc.c.

WINDOW_FUNC

(

eight_short

)

Definition at line 113 of file aacenc.c.

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

static

Definition at line 139 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 160 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 181 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 195 of file aacenc.c.

Referenced by aac_encode_frame().

static void apply_intensity_stereo ( ChannelElement *  cpe )

static

Definition at line 245 of file aacenc.c.

Referenced by aac_encode_frame().

static void apply_mid_side_stereo ( ChannelElement *  cpe )

static

Definition at line 272 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 301 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 315 of file aacenc.c.

Referenced by encode_individual_channel().

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

static

Encode pulse data.

Definition at line 351 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 370 of file aacenc.c.

Referenced by encode_individual_channel().

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

static

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

Definition at line 398 of file aacenc.c.

Referenced by aac_encode_frame().

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

static

Encode one channel of audio data.

Definition at line 418 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 442 of file aacenc.c.

Referenced by aac_encode_frame().

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

static

Definition at line 463 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 485 of file aacenc.c.

static av_cold int aac_encode_end ( AVCodecContext *  avctx )

static

Definition at line 736 of file aacenc.c.

Referenced by aac_encode_init().

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

static

Definition at line 753 of file aacenc.c.

Referenced by aac_encode_init().

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

static

Definition at line 775 of file aacenc.c.

Referenced by aac_encode_init().

static av_cold int aac_encode_init ( AVCodecContext *  avctx )

static

Definition at line 790 of file aacenc.c.

Variable Documentation

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 130 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", "Coding algorithm", 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"},
    {"aac_pns", "Perceptual Noise Substitution", 0x42, AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, AACENC_FLAGS, "aac_pns"},
        {"disable",  "Disable perceptual noise substitution", 0, AV_OPT_TYPE_CONST, {.i64 =  0 }, INT_MIN, INT_MAX, AACENC_FLAGS, "aac_pns"},
        {"enable",   "Enable perceptual noise substitution",  0, AV_OPT_TYPE_CONST, {.i64 =  1 }, INT_MIN, INT_MAX, AACENC_FLAGS, "aac_pns"},
    {"aac_is", "Intensity stereo coding", 0x42, AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, AACENC_FLAGS, "intensity_stereo"},
        {"disable",  "Disable intensity stereo coding", 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, AACENC_FLAGS, "intensity_stereo"},
        {"enable",   "Enable intensity stereo coding", 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, AACENC_FLAGS, "intensity_stereo"},
    {"aac_tns", "Temporal noise shaping", 0x42, AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AACENC_FLAGS, "aac_tns"},
        {"disable",  "Disable temporal noise shaping", 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, AACENC_FLAGS, "aac_tns"},
        {"enable",   "Enable temporal noise shaping", 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, AACENC_FLAGS, "aac_tns"},
    {"aac_pred", "AAC-Main prediction", 0x42, AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AACENC_FLAGS, "aac_pred"},
        {"disable",  "Disable AAC-Main prediction", 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, AACENC_FLAGS, "aac_pred"},
        {"enable",   "Enable AAC-Main prediction", 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, AACENC_FLAGS, "aac_pred"},
    {NULL}
}

Definition at line 877 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 902 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   = AV_CODEC_CAP_SMALL_LAST_FRAME | AV_CODEC_CAP_DELAY |
                      AV_CODEC_CAP_EXPERIMENTAL,
    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
                                                     AV_SAMPLE_FMT_NONE },
    .priv_class     = &aacenc_class,
}

Definition at line 909 of file aacenc.c.