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.
FFPsyChannelGroup *	ff_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

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Define Documentation

#define FILT_ORDER   4

Definition at line 90 of file psymodel.c.

Referenced by ff_psy_preprocess_init().

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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().

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Variable Documentation

const FFPsyModel ff_aac_psy_model

Definition at line 926 of file aacpsy.c.