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"
#include "dsputil.h"

Go to the source code of this file.

Data Structures
struct	RA288Context
Defines
#define	BITSTREAM_READER_LE
#define	MAX_BACKWARD_FILTER_ORDER   36
#define	MAX_BACKWARD_FILTER_LEN   40
#define	MAX_BACKWARD_FILTER_NONREC   35
#define	RA288_BLOCK_SIZE   5
#define	RA288_BLOCKS_PER_FRAME   32
Functions
static av_cold int	ra288_decode_init (AVCodecContext *avctx)
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 (RA288Context *ractx, 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 (RA288Context *ractx, 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 *got_frame_ptr, AVPacket *avpkt)
Variables
AVCodec	ff_ra_288_decoder

---

Define Documentation

#define BITSTREAM_READER_LE

Definition at line 23 of file ra288.c.

#define MAX_BACKWARD_FILTER_LEN   40

Definition at line 32 of file ra288.c.

Referenced by do_hybrid_window().

#define MAX_BACKWARD_FILTER_NONREC   35

Definition at line 33 of file ra288.c.

Referenced by do_hybrid_window().

#define MAX_BACKWARD_FILTER_ORDER   36

Definition at line 31 of file ra288.c.

Referenced by backward_filter(), and do_hybrid_window().

#define RA288_BLOCK_SIZE   5

Definition at line 35 of file ra288.c.

Referenced by ra288_decode_frame().

#define RA288_BLOCKS_PER_FRAME   32

Definition at line 36 of file ra288.c.

Referenced by ra288_decode_frame().

---

Function Documentation

static void backward_filter	(	RA288Context *	ractx,
		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 157 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 73 of file ra288.c.

Referenced by do_hybrid_window().

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

Definition at line 80 of file ra288.c.

static void do_hybrid_window	(	RA288Context *	ractx,
		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 129 of file ra288.c.

Referenced by backward_filter().

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

Definition at line 172 of file ra288.c.

static av_cold int ra288_decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 61 of file ra288.c.

---

Variable Documentation

AVCodec ff_ra_288_decoder

Initial value:

 {
    .name           = "real_288",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = CODEC_ID_RA_288,
    .priv_data_size = sizeof(RA288Context),
    .init           = ra288_decode_init,
    .decode         = ra288_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name      = NULL_IF_CONFIG_SMALL("RealAudio 2.0 (28.8K)"),
}

Definition at line 223 of file ra288.c.