libavcodec/ac3enc_fixed.c File Reference

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

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

Go to the source code of this file.

Defines
#define	CONFIG_FFT_FLOAT   0
#define	AC3ENC_TYPE   AC3ENC_TYPE_AC3_FIXED
Functions
av_cold void AC3_NAME()	mdct_end (AC3EncodeContext *s)
	Finalize MDCT and free allocated memory.
av_cold int AC3_NAME()	mdct_init (AC3EncodeContext *s)
	Initialize MDCT tables.
static void	apply_window (void *dsp, int16_t *output, const int16_t *input, const int16_t *window, unsigned int len)
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 (DSPContext *dsp, int32_t *coef, unsigned int len)
static CoefType	calc_cpl_coord (CoefSumType energy_ch, CoefSumType energy_cpl)
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.

---

Define Documentation

#define AC3ENC_TYPE   AC3ENC_TYPE_AC3_FIXED

Definition at line 35 of file ac3enc_fixed.c.

#define CONFIG_FFT_FLOAT   0

Definition at line 29 of file ac3enc_fixed.c.

---

Function Documentation

static av_cold int ac3_fixed_encode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 147 of file ac3enc_fixed.c.

static void apply_window	(	void *	dsp,
		int16_t *	output,
		const int16_t *	input,
		const int16_t *	window,
		unsigned int	len
	)			[static]

Definition at line 76 of file ac3enc_fixed.c.

static CoefType calc_cpl_coord	(	CoefSumType	energy_ch,
		CoefSumType	energy_cpl
	)			[static]

Definition at line 134 of file ac3enc_fixed.c.

Referenced by apply_channel_coupling().

static void clip_coefficients	(	DSPContext *	dsp,
		int32_t *	coef,
		unsigned int	len
	)			[static]

Definition at line 125 of file ac3enc_fixed.c.

Referenced by apply_channel_coupling(), and encode_frame().

av_cold void AC3_NAME() mdct_end

(

AC3EncodeContext *

s

)

Finalize MDCT and free allocated memory.

Parameters:

s

AC-3 encoder private context

Definition at line 53 of file ac3enc_fixed.c.

av_cold int AC3_NAME() 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 65 of file ac3enc_fixed.c.

static int normalize_samples

(

AC3EncodeContext *

s

)

[static]

Definition at line 88 of file ac3enc_fixed.c.

Referenced by apply_mdct().

static void scale_coefficients

(

AC3EncodeContext *

s

)

[static]

Definition at line 102 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 115 of file ac3enc_fixed.c.

Referenced by compute_rematrixing_strategy().

---

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 38 of file ac3enc_fixed.c.

AVCodec ff_ac3_fixed_encoder

Initial value:

 {
    .name            = "ac3_fixed",
    .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_S16,
                                                      AV_SAMPLE_FMT_NONE },
    .long_name       = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
    .priv_class      = &ac3enc_class,
    .channel_layouts = ff_ac3_channel_layouts,
    .defaults        = ac3_defaults,
}

Definition at line 155 of file ac3enc_fixed.c.