ra288.c File Reference

#include "libavutil/channel_layout.h"
#include "libavutil/float_dsp.h"
#include "libavutil/internal.h"
#include "libavutil/mem_internal.h"
#include "avcodec.h"
#include "celp_filters.h"
#include "get_bits.h"
#include "internal.h"
#include "lpc.h"
#include "ra288.h"

Go to the source code of this file.

Data Structures
struct	RA288Context

Macros
#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. More...
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. More...
static int	ra288_decode_frame (AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)

Variables
const AVCodec	ff_ra_288_decoder

Macro Definition Documentation

BITSTREAM_READER_LE

#define BITSTREAM_READER_LE

Definition at line 27 of file ra288.c.

MAX_BACKWARD_FILTER_ORDER

#define MAX_BACKWARD_FILTER_ORDER   36

Definition at line 35 of file ra288.c.

MAX_BACKWARD_FILTER_LEN

#define MAX_BACKWARD_FILTER_LEN   40

Definition at line 36 of file ra288.c.

MAX_BACKWARD_FILTER_NONREC

#define MAX_BACKWARD_FILTER_NONREC   35

Definition at line 37 of file ra288.c.

RA288_BLOCK_SIZE

#define RA288_BLOCK_SIZE   5

Definition at line 39 of file ra288.c.

RA288_BLOCKS_PER_FRAME

#define RA288_BLOCKS_PER_FRAME   32

Definition at line 40 of file ra288.c.

Function Documentation

ra288_decode_init()

static av_cold int ra288_decode_init ( AVCodecContext *  avctx )

static

Definition at line 65 of file ra288.c.

convolve()

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

static

Definition at line 88 of file ra288.c.

Referenced by do_hybrid_window().

decode()

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

static

Definition at line 95 of file ra288.c.

Referenced by ra288_decode_frame().

do_hybrid_window()

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 144 of file ra288.c.

Referenced by backward_filter().

backward_filter()

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 174 of file ra288.c.

Referenced by ra288_decode_frame().

ra288_decode_frame()

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

static

Definition at line 189 of file ra288.c.

Variable Documentation

ff_ra_288_decoder

const AVCodec ff_ra_288_decoder

Initial value:

= {
    .name           = "real_288",
    .long_name      = NULL_IF_CONFIG_SMALL("RealAudio 2.0 (28.8K)"),
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_RA_288,
    .priv_data_size = sizeof(RA288Context),
    .init           = ra288_decode_init,
    .decode         = ra288_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
}

Definition at line 240 of file ra288.c.