libavcodec/ra288.c File Reference

#include "avcodec.h"
#include "get_bits.h"
#include "ra288.h"
#include "lpc.h"
#include "celp_math.h"
#include "celp_filters.h"

Go to the source code of this file.

Data Structures
struct	RA288Context
Defines
#define	ALT_BITSTREAM_READER_LE
Functions
static av_cold int	ra288_decode_init (AVCodecContext *avctx)
static void	apply_window (float *tgt, const float *m1, const float *m2, int n)
static void	convolve (float *tgt, const float *src, int len, int n)
static void	decode (RA288Context *ractx, float gain, int cb_coef)
static void	do_hybrid_window (int order, int n, int non_rec, float *out, float *hist, float *out2, const float *window)
	Hybrid window filtering, see blocks 36 and 49 of the G.728 specification.
static void	backward_filter (float *hist, float *rec, const float *window, float *lpc, const float *tab, int order, int n, int non_rec, int move_size)
	Backward synthesis filter, find the LPC coefficients from past speech data.
static int	ra288_decode_frame (AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
Variables
AVCodec	ra_288_decoder

---

Define Documentation

#define ALT_BITSTREAM_READER_LE

Definition at line 23 of file ra288.c.

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Function Documentation

static void apply_window	(	float *	tgt,
		const float *	m1,
		const float *	m2,
		int	n
	)			[static]

Definition at line 57 of file ra288.c.

Referenced by backward_filter(), and do_hybrid_window().

static void backward_filter	(	float *	hist,
		float *	rec,
		const float *	window,
		float *	lpc,
		const float *	tab,
		int	order,
		int	n,
		int	non_rec,
		int	move_size
	)			[static]

Backward synthesis filter, find the LPC coefficients from past speech data.

Definition at line 144 of file ra288.c.

Referenced by ra288_decode_frame().

static void convolve	(	float *	tgt,
		const float *	src,
		int	len,
		int	n
	)			[static]

Definition at line 63 of file ra288.c.

Referenced by do_hybrid_window().

static void decode	(	RA288Context *	ractx,
		float	gain,
		int	cb_coef
	)			[static]

Definition at line 70 of file ra288.c.

static void do_hybrid_window	(	int	order,
		int	n,
		int	non_rec,
		float *	out,
		float *	hist,
		float *	out2,
		const float *	window
	)			[static]

Hybrid window filtering, see blocks 36 and 49 of the G.728 specification.

Parameters:

	order	filter order
	n	input length
	non_rec	number of non-recursive samples
	out	filter output
	hist	pointer to the input history of the filter
	out	pointer to the non-recursive part of the output
	out2	pointer to the recursive part of the output
	window	pointer to the windowing function table

Definition at line 119 of file ra288.c.

Referenced by backward_filter().

static int ra288_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		AVPacket *	avpkt
	)			[static]

Definition at line 158 of file ra288.c.

static av_cold int ra288_decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 51 of file ra288.c.

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Variable Documentation

AVCodec ra_288_decoder

Initial value:

{
    "real_288",
    AVMEDIA_TYPE_AUDIO,
    CODEC_ID_RA_288,
    sizeof(RA288Context),
    ra288_decode_init,
    NULL,
    NULL,
    ra288_decode_frame,
    .long_name = NULL_IF_CONFIG_SMALL("RealAudio 2.0 (28.8K)"),
}

Definition at line 202 of file ra288.c.