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.


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


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...


static const 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.

#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 

Definition at line 61 of file ac3dec_fixed.c.

Referenced by decode_audio_block().

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).

Definition at line 129 of file ac3dec_fixed.c.

Referenced by decode_audio_block().

Variable Documentation

const int end_freq_inv_tab[8]
Initial value:
50529027, 44278013, 39403370, 32292987, 27356480, 23729101, 20951060, 18755316

Definition at line 56 of file ac3dec_fixed.c.

Referenced by spx_strategy().

const AVOption options[]
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},
#define NULL
Definition: coverity.c:32
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 local see the OFFSET() macro
Definition: af_afade.c:54

Definition at line 157 of file ac3dec_fixed.c.

const AVClass ac3_decoder_class
Initial value:
= {
.class_name = "Fixed-Point AC-3 Decoder",
.item_name = av_default_item_name,
.option = options,
Definition: version.h:85
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
static const AVOption options[]
Definition: ac3dec_fixed.c:157

Definition at line 164 of file ac3dec_fixed.c.

AVCodec ff_ac3_fixed_decoder
Initial value:
= {
.name = "ac3_fixed",
.priv_data_size = sizeof (AC3DecodeContext),
.close = ac3_decode_end,
.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
.long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
.priv_class = &ac3_decoder_class,
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: internal.h:49
static const AVClass ac3_decoder_class
Definition: ac3dec_fixed.c:164
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
Codec should fill in channel configuration and samplerate instead of container.
Definition: codec.h:104
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:41
static av_cold int ac3_decode_end(AVCodecContext *avctx)
Uninitialize the AC-3 decoder.
Definition: ac3dec.c:1837
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:117
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
Audio sample formats.
Definition: samplefmt.h:58
signed 16 bits, planar
Definition: samplefmt.h:67
static av_cold int ac3_decode_init(AVCodecContext *avctx)
AVCodec initialization.
Definition: ac3dec.c:185
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators...
Definition: codec.h:52

Definition at line 171 of file ac3dec_fixed.c.