libavcodec/psymodel.c File Reference

#include "avcodec.h"
#include "psymodel.h"
#include "iirfilter.h"

Go to the source code of this file.

Data Structures

struct  FFPsyPreprocessContext

Defines

#define FILT_ORDER   4

Functions

av_cold int ff_psy_init (FFPsyContext *ctx, AVCodecContext *avctx, int num_lens, const uint8_t **bands, const int *num_bands, int num_groups, const uint8_t *group_map)
 Initialize psychoacoustic model.
FFPsyChannelGroupff_psy_find_group (FFPsyContext *ctx, int channel)
 Determine what group a channel belongs to.
av_cold void ff_psy_end (FFPsyContext *ctx)
 Cleanup model context at the end.
av_cold struct
FFPsyPreprocessContext
ff_psy_preprocess_init (AVCodecContext *avctx)
 psychoacoustic model audio preprocessing initialization
void ff_psy_preprocess (struct FFPsyPreprocessContext *ctx, float **audio, int channels)
 Preprocess several channel in audio frame in order to compress it better.
av_cold void ff_psy_preprocess_end (struct FFPsyPreprocessContext *ctx)
 Cleanup audio preprocessing module.

Variables

const FFPsyModel ff_aac_psy_model


Define Documentation

#define FILT_ORDER   4

Definition at line 90 of file psymodel.c.

Referenced by ff_psy_preprocess_init().


Function Documentation

av_cold void ff_psy_end ( FFPsyContext ctx  ) 

Cleanup model context at the end.

Parameters:
ctx model context

Definition at line 73 of file psymodel.c.

Referenced by aac_encode_end().

FFPsyChannelGroup* ff_psy_find_group ( FFPsyContext ctx,
int  channel 
)

Determine what group a channel belongs to.

Parameters:
ctx psymodel context
channel channel to locate the group for
Returns:
pointer to the FFPsyChannelGroup this channel belongs to

Definition at line 63 of file psymodel.c.

Referenced by psy_3gpp_analyze().

av_cold int ff_psy_init ( FFPsyContext ctx,
AVCodecContext avctx,
int  num_lens,
const uint8_t **  bands,
const int *  num_bands,
int  num_groups,
const uint8_t *  group_map 
)

Initialize psychoacoustic model.

Parameters:
ctx model context
avctx codec context
num_lens number of possible frame lengths
bands scalefactor band lengths for all frame lengths
num_bands number of scalefactor bands for all frame lengths
num_groups number of channel groups
group_map array with # of channels in group - 1, for each group
Returns:
zero if successful, a negative value if not

Definition at line 28 of file psymodel.c.

Referenced by aac_encode_init().

void ff_psy_preprocess ( struct FFPsyPreprocessContext ctx,
float **  audio,
int  channels 
)

Preprocess several channel in audio frame in order to compress it better.

Parameters:
ctx preprocessing context
audio samples to be filtered (in place)
channels number of channel to preprocess

Definition at line 115 of file psymodel.c.

Referenced by aac_encode_frame().

av_cold void ff_psy_preprocess_end ( struct FFPsyPreprocessContext ctx  ) 

Cleanup audio preprocessing module.

Definition at line 127 of file psymodel.c.

Referenced by aac_encode_end().

av_cold struct FFPsyPreprocessContext* ff_psy_preprocess_init ( AVCodecContext avctx  )  [read]

psychoacoustic model audio preprocessing initialization

Definition at line 92 of file psymodel.c.

Referenced by aac_encode_init().


Variable Documentation

Definition at line 926 of file aacpsy.c.


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