eac3enc.c File Reference

E-AC-3 encoder. More...

#include "libavutil/attributes.h"
#include "libavutil/thread.h"
#include "ac3enc.h"
#include "codec_internal.h"
#include "eac3enc.h"
#include "eac3_data.h"
#include "put_bits.h"

Go to the source code of this file.

Macros
#define	AC3ENC_FLOAT   1

Functions
static av_cold void	eac3_exponent_init (void)
	Initialize E-AC-3 exponent tables.
void	ff_eac3_get_frame_exp_strategy (AC3EncodeContext *s)
	Determine frame exponent strategy use and indices.
void	ff_eac3_set_cpl_states (AC3EncodeContext *s)
	Set coupling states.
static void	eac3_output_frame_header (AC3EncodeContext *s, PutBitContext *pb)
	Write the E-AC-3 frame header to the output bitstream.
static av_cold int	eac3_encode_init (AVCodecContext *avctx)

Variables
static const AVClass	eac3enc_class
static int8_t	eac3_frame_expstr_index_tab [3][4][4][4][4][4]
	LUT for finding a matching frame exponent strategy index from a set of exponent strategies for a single channel across all 6 blocks.
const FFCodec	ff_eac3_encoder

Detailed Description

E-AC-3 encoder.

Definition in file eac3enc.c.

Macro Definition Documentation

AC3ENC_FLOAT

#define AC3ENC_FLOAT   1

Definition at line 27 of file eac3enc.c.

Function Documentation

eac3_exponent_init()

static av_cold void eac3_exponent_init ( void )

static

Initialize E-AC-3 exponent tables.

Definition at line 55 of file eac3enc.c.

Referenced by eac3_encode_init().

ff_eac3_get_frame_exp_strategy()

void ff_eac3_get_frame_exp_strategy

(

AC3EncodeContext *

s

)

Determine frame exponent strategy use and indices.

Definition at line 71 of file eac3enc.c.

Referenced by compute_exp_strategy().

ff_eac3_set_cpl_states()

void ff_eac3_set_cpl_states

(

AC3EncodeContext *

s

)

Set coupling states.

This determines whether certain flags must be written to the bitstream or whether they will be implicitly already known by the decoder.

Definition at line 98 of file eac3enc.c.

Referenced by apply_channel_coupling().

eac3_output_frame_header()

static void eac3_output_frame_header ( AC3EncodeContext * s, PutBitContext * pb )

static

Write the E-AC-3 frame header to the output bitstream.

Definition at line 133 of file eac3enc.c.

Referenced by eac3_encode_init().

eac3_encode_init()

static av_cold int eac3_encode_init ( AVCodecContext * avctx )

static

Definition at line 255 of file eac3enc.c.

Variable Documentation

eac3enc_class

const AVClass eac3enc_class

static

Initial value:

= {
    .class_name = "E-AC-3 Encoder",
    .item_name  = av_default_item_name,
    .option     = &ff_ac3_enc_options[2], 
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 38 of file eac3enc.c.

eac3_frame_expstr_index_tab

int8_t eac3_frame_expstr_index_tab[3][4][4][4][4][4]

static

LUT for finding a matching frame exponent strategy index from a set of exponent strategies for a single channel across all 6 blocks.

Definition at line 49 of file eac3enc.c.

Referenced by eac3_exponent_init(), and ff_eac3_get_frame_exp_strategy().

ff_eac3_encoder

const FFCodec ff_eac3_encoder

Initial value:

= {
    .p.name          = "eac3",
    CODEC_LONG_NAME("ATSC A/52 E-AC-3"),
    .p.type          = AVMEDIA_TYPE_AUDIO,
    .p.id            = AV_CODEC_ID_EAC3,
    .p.capabilities  = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
                       AV_CODEC_CAP_SMALL_LAST_FRAME | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
    .priv_data_size  = sizeof(AC3EncodeContext),
    .init            = eac3_encode_init,
    FF_CODEC_ENCODE_CB(ff_ac3_encode_frame),
    .close           = ff_ac3_encode_close,
    CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_FLTP),
    .p.priv_class    = &eac3enc_class,
    CODEC_SAMPLERATES_ARRAY(ff_ac3_sample_rate_tab),
    CODEC_CH_LAYOUTS_ARRAY(ff_ac3_ch_layouts),
    .defaults        = ff_ac3_enc_defaults,
    .caps_internal   = FF_CODEC_CAP_INIT_CLEANUP,
}

Definition at line 268 of file eac3enc.c.