wma.c File Reference

#include "avcodec.h"
#include "sinewin.h"
#include "wma.h"
#include "wma_common.h"
#include "wmadata.h"
#include <assert.h>

Go to the source code of this file.

Functions
static void	init_coef_vlc (VLC *vlc, uint16_t **prun_table, float **plevel_table, uint16_t **pint_table, const CoefVLCTable *vlc_table)
int	ff_wma_init (AVCodecContext *avctx, int flags2)
int	ff_wma_total_gain_to_bits (int total_gain)
int	ff_wma_end (AVCodecContext *avctx)
unsigned int	ff_wma_get_large_val (GetBitContext *gb)
	Decode an uncompressed coefficient.
int	ff_wma_run_level_decode (AVCodecContext *avctx, GetBitContext *gb, VLC *vlc, const float *level_table, const uint16_t *run_table, int version, WMACoef *ptr, int offset, int num_coefs, int block_len, int frame_len_bits, int coef_nb_bits)
	Decode run level compressed coefficients.

Function Documentation

static void init_coef_vlc ( VLC *  vlc, uint16_t **  prun_table, float **  plevel_table, uint16_t **  pint_table, const CoefVLCTable *  vlc_table  )

static

Definition at line 33 of file wma.c.

int ff_wma_init	(	AVCodecContext *	avctx,
		int	flags2
	)

Definition at line 71 of file wma.c.

Referenced by encode_init(), and wma_decode_init().

int ff_wma_total_gain_to_bits

(

int

total_gain

)

Definition at line 360 of file wma.c.

Referenced by encode_block(), and wma_decode_block().

int ff_wma_end

(

AVCodecContext *

avctx

)

Definition at line 369 of file wma.c.

unsigned int ff_wma_get_large_val

(

GetBitContext *

gb

)

Decode an uncompressed coefficient.

Parameters

gb	GetBitContext

Returns

the decoded coefficient

consumes up to 34 bits

decode length

Definition at line 398 of file wma.c.

Referenced by decode_coeffs(), and ff_wma_run_level_decode().

int ff_wma_run_level_decode	(	AVCodecContext *	avctx,
		GetBitContext *	gb,
		VLC *	vlc,
		const float *	level_table,
		const uint16_t *	run_table,
		int	version,
		WMACoef *	ptr,
		int	offset,
		int	num_coefs,
		int	block_len,
		int	frame_len_bits,
		int	coef_nb_bits
	)

Decode run level compressed coefficients.

Parameters

avctx	codec context
gb	bitstream reader context
vlc	vlc table for get_vlc2
level_table	level codes
run_table	run codes
version	0 for wma1,2 1 for wmapro
ptr	output buffer
offset	offset in the output buffer
num_coefs	number of input coefficents
block_len	input buffer length (2^n)
frame_len_bits	number of bits for escaped run codes
coef_nb_bits	number of bits for escaped level codes

Returns

0 on success, -1 otherwise

normal code

EOB

escape

NOTE: this is rather suboptimal. reading block_len_bits would be better

escape decode

NOTE: EOB can be omitted

Definition at line 431 of file wma.c.

Referenced by decode_coeffs(), and wma_decode_block().