ac3dec_fixed.c File Reference

#include "ac3dec.h"
#include "ac3dec.c"

Go to the source code of this file.

Macros
#define	FFT_FLOAT   0
#define	USE_FIXED   1
#define	FFT_FIXED_32   1

Functions
static void	scale_coefs (int32_t *dst, const int32_t *src, int dynrng, int len)
static void	ac3_downmix_c_fixed16 (int16_t **samples, int16_t(*matrix)[2], int out_ch, int in_ch, int len)
	Downmix samples from original signal to stereo or mono (this is for 16-bit samples and fixed point decoder - original (for 32-bit samples) is in ac3dsp.c).

Variables
static const uint8_t	center_levels [4] = { 4, 5, 6, 5 }
	Table for center mix levels reference: Section 5.4.2.4 cmixlev.
static const uint8_t	surround_levels [4] = { 4, 6, 7, 6 }
	Table for surround mix levels reference: Section 5.4.2.5 surmixlev.
int	end_freq_inv_tab [8]
static const AVOption	options []
static const AVClass	ac3_decoder_class
AVCodec	ff_ac3_fixed_decoder

Macro Definition Documentation

#define FFT_FLOAT   0

Definition at line 50 of file ac3dec_fixed.c.

#define USE_FIXED   1

Definition at line 51 of file ac3dec_fixed.c.

Referenced by ac3_decode_init(), and decode_audio_block().

#define FFT_FIXED_32   1

Definition at line 52 of file ac3dec_fixed.c.

Function Documentation

static void scale_coefs ( int32_t *  dst, const int32_t *  src, int  dynrng, int  len  )

static

Definition at line 73 of file ac3dec_fixed.c.

Referenced by decode_audio_block().

static void ac3_downmix_c_fixed16 ( int16_t **  samples, int16_t(*)  matrix[2], int  out_ch, int  in_ch, int  len  )

static

Downmix samples from original signal to stereo or mono (this is for 16-bit samples and fixed point decoder - original (for 32-bit samples) is in ac3dsp.c).

Definition at line 125 of file ac3dec_fixed.c.

Referenced by decode_audio_block().

Variable Documentation

const uint8_t center_levels[4] = { 4, 5, 6, 5 }

static

Table for center mix levels reference: Section 5.4.2.4 cmixlev.

Definition at line 60 of file ac3dec_fixed.c.

const uint8_t surround_levels[4] = { 4, 6, 7, 6 }

static

Table for surround mix levels reference: Section 5.4.2.5 surmixlev.

Definition at line 66 of file ac3dec_fixed.c.

int end_freq_inv_tab[8]

Initial value:

=
{
    50529027, 44278013, 39403370, 32292987, 27356480, 23729101, 20951060, 18755316
}

Definition at line 68 of file ac3dec_fixed.c.

Referenced by decode_audio_block().

const AVOption options[]

static

Initial value:

= {
    { NULL},
}

Definition at line 152 of file ac3dec_fixed.c.

const AVClass ac3_decoder_class

static

Initial value:

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

Definition at line 156 of file ac3dec_fixed.c.

AVCodec ff_ac3_fixed_decoder

Initial value:

= {
    .name           = "ac3_fixed",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_AC3,
    .priv_data_size = sizeof (AC3DecodeContext),
    .init           = ac3_decode_init,
    .close          = ac3_decode_end,
    .decode         = ac3_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name      = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
                                                      AV_SAMPLE_FMT_NONE },
    .priv_class     = &ac3_decoder_class,
}

Definition at line 163 of file ac3dec_fixed.c.