ac3enc_fixed.c File Reference

fixed-point AC-3 encoder. More...

#include "internal.h"
#include "audiodsp.h"
#include "ac3enc.h"
#include "eac3enc.h"
#include "ac3enc_opts_template.c"
#include "ac3enc_template.c"

Go to the source code of this file.

Macros
#define	FFT_FLOAT   0
#define	AC3ENC_TYPE   AC3ENC_TYPE_AC3_FIXED

Functions
static int	normalize_samples (AC3EncodeContext *s)
static void	scale_coefficients (AC3EncodeContext *s)
static void	sum_square_butterfly (AC3EncodeContext *s, int64_t sum[4], const int32_t *coef0, const int32_t *coef1, int len)
static void	clip_coefficients (AudioDSPContext *adsp, int32_t *coef, unsigned int len)
static CoefType	calc_cpl_coord (CoefSumType energy_ch, CoefSumType energy_cpl)
av_cold void	ff_ac3_fixed_mdct_end (AC3EncodeContext *s)
	Finalize MDCT and free allocated memory. More...
av_cold int	ff_ac3_fixed_mdct_init (AC3EncodeContext *s)
	Initialize MDCT tables. More...
static av_cold int	ac3_fixed_encode_init (AVCodecContext *avctx)

Variables
static const AVClass	ac3enc_class
AVCodec	ff_ac3_fixed_encoder

Detailed Description

fixed-point AC-3 encoder.

Definition in file ac3enc_fixed.c.

Macro Definition Documentation

#define FFT_FLOAT   0

Definition at line 29 of file ac3enc_fixed.c.

#define AC3ENC_TYPE   AC3ENC_TYPE_AC3_FIXED

Definition at line 36 of file ac3enc_fixed.c.

Function Documentation

static int normalize_samples ( AC3EncodeContext *  s )

static

Definition at line 50 of file ac3enc_fixed.c.

Referenced by apply_mdct().

static void scale_coefficients ( AC3EncodeContext *  s )

static

Definition at line 64 of file ac3enc_fixed.c.

Referenced by encode_frame().

static void sum_square_butterfly ( AC3EncodeContext *  s, int64_t  sum[4], const int32_t *  coef0, const int32_t *  coef1, int  len  )

static

Definition at line 77 of file ac3enc_fixed.c.

Referenced by compute_rematrixing_strategy().

static void clip_coefficients ( AudioDSPContext *  adsp, int32_t *  coef, unsigned int  len  )

static

Definition at line 87 of file ac3enc_fixed.c.

Referenced by apply_channel_coupling(), and encode_frame().

static CoefType calc_cpl_coord ( CoefSumType  energy_ch, CoefSumType  energy_cpl  )

static

Definition at line 97 of file ac3enc_fixed.c.

Referenced by apply_channel_coupling().

av_cold void ff_ac3_fixed_mdct_end

(

AC3EncodeContext *

s

)

Finalize MDCT and free allocated memory.

Parameters

s	AC-3 encoder private context

Definition at line 118 of file ac3enc_fixed.c.

Referenced by ff_ac3_encode_init().

av_cold int ff_ac3_fixed_mdct_init

(

AC3EncodeContext *

s

)

Initialize MDCT tables.

Parameters

s	AC-3 encoder private context

Returns

0 on success, negative error code on failure

Definition at line 130 of file ac3enc_fixed.c.

Referenced by ff_ac3_encode_init().

static av_cold int ac3_fixed_encode_init ( AVCodecContext *  avctx )

static

Definition at line 138 of file ac3enc_fixed.c.

Variable Documentation

const AVClass ac3enc_class

static

Initial value:

= {
    .class_name = "Fixed-Point AC-3 Encoder",
    .item_name  = av_default_item_name,
    .option     = ac3_options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 39 of file ac3enc_fixed.c.

AVCodec ff_ac3_fixed_encoder

Initial value:

= {
    .name            = "ac3_fixed",
    .long_name       = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
    .type            = AVMEDIA_TYPE_AUDIO,
    .id              = AV_CODEC_ID_AC3,
    .priv_data_size  = sizeof(AC3EncodeContext),
    .init            = ac3_fixed_encode_init,
    .encode2         = ff_ac3_fixed_encode_frame,
    .close           = ff_ac3_encode_close,
    .sample_fmts     = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16P,
                                                      AV_SAMPLE_FMT_NONE },
    .priv_class      = &ac3enc_class,
    .channel_layouts = ff_ac3_channel_layouts,
    .defaults        = ac3_defaults,
}

Definition at line 146 of file ac3enc_fixed.c.