FFmpeg
Macros | Functions | Variables
ac3dec_fixed.c File Reference
#include "ac3dec.h"
#include "eac3dec.c"
#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, 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). More...
 

Variables

static const int end_freq_inv_tab [8]
 
static const AVOption options []
 
static const AVClass ac3_decoder_class
 
const AVCodec ff_ac3_fixed_decoder
 

Macro Definition Documentation

◆ FFT_FLOAT

#define FFT_FLOAT   0

Definition at line 50 of file ac3dec_fixed.c.

◆ USE_FIXED

#define USE_FIXED   1

Definition at line 51 of file ac3dec_fixed.c.

◆ FFT_FIXED_32

#define FFT_FIXED_32   1

Definition at line 52 of file ac3dec_fixed.c.

Function Documentation

◆ scale_coefs()

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

Definition at line 61 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 129 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 56 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 },
{ NULL},
}

Definition at line 157 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 164 of file ac3dec_fixed.c.

◆ ff_ac3_fixed_decoder

const 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 = AV_CODEC_CAP_CHANNEL_CONF |
AV_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,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
}

Definition at line 171 of file ac3dec_fixed.c.

FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:42
AV_CODEC_ID_AC3
@ AV_CODEC_ID_AC3
Definition: codec_id.h:425
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
ac3_decoder_class
static const AVClass ac3_decoder_class
Definition: ac3dec_fixed.c:164
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
ac3_decode_init
static av_cold int ac3_decode_init(AVCodecContext *avctx)
AVCodec initialization.
Definition: ac3dec.c:185
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
NULL
#define NULL
Definition: coverity.c:32
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
AV_CODEC_CAP_CHANNEL_CONF
#define AV_CODEC_CAP_CHANNEL_CONF
Codec should fill in channel configuration and samplerate instead of container.
Definition: codec.h:104
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:116
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:59
AV_SAMPLE_FMT_S16P
@ AV_SAMPLE_FMT_S16P
signed 16 bits, planar
Definition: samplefmt.h:67
AV_OPT_TYPE_FLOAT
@ AV_OPT_TYPE_FLOAT
Definition: opt.h:227
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: internal.h:50
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
ac3_decode_end
static av_cold int ac3_decode_end(AVCodecContext *avctx)
Uninitialize the AC-3 decoder.
Definition: ac3dec.c:1837
options
static const AVOption options[]
Definition: ac3dec_fixed.c:157
OFFSET
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option keep it simple and lowercase description are in without and describe what they for example set the foo of the bar offset is the offset of the field in your see the OFFSET() macro
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:241
PAR
@ PAR
Definition: af_afade.c:54
ac3_decode_frame
static int ac3_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Decode a single AC-3 frame.
Definition: ac3dec.c:1468
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