psymodel.c File Reference

#include <string.h>
#include "avcodec.h"
#include "psymodel.h"
#include "iirfilter.h"
#include "libavutil/mem.h"

Go to the source code of this file.

Data Structures
struct	FFPsyPreprocessContext

Macros
#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. More...
FFPsyChannelGroup *	ff_psy_find_group (FFPsyContext *ctx, int channel)
	Determine what group a channel belongs to. More...
av_cold void	ff_psy_end (FFPsyContext *ctx)
	Cleanup model context at the end. More...
av_cold struct FFPsyPreprocessContext *	ff_psy_preprocess_init (AVCodecContext *avctx)
	psychoacoustic model audio preprocessing initialization More...
void	ff_psy_preprocess (struct FFPsyPreprocessContext *ctx, float **audio, int channels)
	Preprocess several channel in audio frame in order to compress it better. More...
av_cold void	ff_psy_preprocess_end (struct FFPsyPreprocessContext *ctx)
	Cleanup audio preprocessing module. More...

Variables
const FFPsyModel	ff_aac_psy_model

Macro Definition Documentation

FILT_ORDER

#define FILT_ORDER   4

Definition at line 101 of file psymodel.c.

Referenced by ff_psy_preprocess_init().

Function Documentation

ff_psy_init()

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 31 of file psymodel.c.

Referenced by aac_encode_init().

ff_psy_find_group()

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 73 of file psymodel.c.

Referenced by psy_3gpp_analyze().

ff_psy_end()

av_cold void ff_psy_end

(

FFPsyContext *

ctx

)

Cleanup model context at the end.

Parameters

ctx	model context

Definition at line 83 of file psymodel.c.

Referenced by aac_encode_end(), and ff_psy_init().

ff_psy_preprocess_init()

av_cold struct FFPsyPreprocessContext* ff_psy_preprocess_init

(

AVCodecContext *

avctx

)

psychoacoustic model audio preprocessing initialization

Definition at line 103 of file psymodel.c.

Referenced by aac_encode_init().

ff_psy_preprocess()

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 139 of file psymodel.c.

Referenced by aac_encode_frame().

ff_psy_preprocess_end()

av_cold void ff_psy_preprocess_end

(

struct FFPsyPreprocessContext *

ctx

)

Cleanup audio preprocessing module.

Definition at line 152 of file psymodel.c.

Referenced by aac_encode_end().

Variable Documentation

ff_aac_psy_model

const FFPsyModel ff_aac_psy_model

Definition at line 1018 of file aacpsy.c.

Referenced by ff_psy_init().