ac3dec_fixed.c File Reference

#include "config_components.h"
#include "ac3dec.h"
#include "codec_internal.h"
#include "ac3dec.c"

Go to the source code of this file.

Macros
#define	USE_FIXED   1
#define	IMDCT_TYPE   AV_TX_INT32_MDCT
#define	AC3_FIXED_COEFF_BITS   2
#define	AC3_FIXED_EXPONENT_MAX   24

Functions
static av_always_inline int	fixed_coeff_bits (const AC3DecodeContext *s)
static void	scale_coefs (int32_t *dst, const int32_t *src, int dynrng, int len)
static void	scale_coefs_q2 (int32_t *dst, const int32_t *src, int dynrng, int len)
static void	ac3_downmix_c_fixed16 (int16_t **samples, int16_t **matrix, 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 int	end_freq_inv_tab [8]
static const AVOption	options []
static const AVClass	ac3_decoder_class
const FFCodec	ff_ac3_fixed_decoder

Macro Definition Documentation

USE_FIXED

#define USE_FIXED   1

Definition at line 51 of file ac3dec_fixed.c.

IMDCT_TYPE

#define IMDCT_TYPE   AV_TX_INT32_MDCT

Definition at line 54 of file ac3dec_fixed.c.

Referenced by ac3_decode_init().

AC3_FIXED_COEFF_BITS

#define AC3_FIXED_COEFF_BITS   2

Definition at line 59 of file ac3dec_fixed.c.

Referenced by dequantize_dexp24_dither(), and fixed_coeff_bits().

AC3_FIXED_EXPONENT_MAX

#define AC3_FIXED_EXPONENT_MAX   24

Definition at line 60 of file ac3dec_fixed.c.

Referenced by ac3_decode_transform_coeffs_ch(), and dequantize_dexp24_dither().

Function Documentation

fixed_coeff_bits()

static av_always_inline int fixed_coeff_bits ( const AC3DecodeContext * s )

static

Definition at line 62 of file ac3dec_fixed.c.

Referenced by ac3_decode_frame(), ac3_decode_transform_coeffs_ch(), decode_audio_block(), and do_imdct().

scale_coefs()

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

static

Definition at line 74 of file ac3dec_fixed.c.

Referenced by decode_audio_block().

scale_coefs_q2()

static void scale_coefs_q2 ( int32_t * dst, const int32_t * src, int dynrng, int len )

static

Definition at line 138 of file ac3dec_fixed.c.

Referenced by decode_audio_block().

ac3_downmix_c_fixed16()

static void ac3_downmix_c_fixed16 ( int16_t ** samples, int16_t ** matrix, 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 185 of file ac3dec_fixed.c.

Referenced by decode_audio_block().

Variable Documentation

end_freq_inv_tab

const int end_freq_inv_tab[8]

static

Initial value:

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

Definition at line 69 of file ac3dec_fixed.c.

Referenced by spx_strategy().

options

const AVOption options[]

static

Initial value:

= {
    { "cons_noisegen", "enable consistent noise generation", OFFSET(consistent_noise_generation), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, PAR },
    { "drc_scale", "percentage of dynamic range compression to apply", OFFSET(drc_scale), AV_OPT_TYPE_FLOAT, {.dbl = 1.0}, 0.0, 6.0, PAR },
    { "heavy_compr", "enable heavy dynamic range compression", OFFSET(heavy_compression), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, PAR },
    { "downmix", "Request a specific channel layout from the decoder", OFFSET(downmix_layout), AV_OPT_TYPE_CHLAYOUT, {.str = NULL}, .flags = PAR },
    { NULL},
}

Definition at line 215 of file ac3dec_fixed.c.

ac3_decoder_class

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 223 of file ac3dec_fixed.c.

ff_ac3_fixed_decoder

const FFCodec ff_ac3_fixed_decoder

Initial value:

= {
    .p.name         = "ac3_fixed",
    CODEC_LONG_NAME("ATSC A/52A (AC-3)"),
    .p.type         = AVMEDIA_TYPE_AUDIO,
    .p.id           = AV_CODEC_ID_AC3,
    .p.priv_class   = &ac3_decoder_class,
    .priv_data_size = sizeof (AC3DecodeContext),
    .init           = ac3_decode_init,
    .flush          = ac3_decode_flush,
    .close          = ac3_decode_end,
    FF_CODEC_DECODE_CB(ac3_decode_frame),
    .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
                      AV_CODEC_CAP_DR1,
    CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_S16P),
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
}

Definition at line 230 of file ac3dec_fixed.c.