#include "libavutil/float_dsp.h"
#include "get_bits.h"
#include "put_bits.h"
#include "fft.h"
#include "fmtconvert.h"

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Data Structures
struct	CoefVLCTable

struct	WMACodecContext

Macros
#define	BLOCK_MIN_BITS 7

#define	BLOCK_MAX_BITS 11

#define	BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)

#define	BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)

#define	HIGH_BAND_MAX_SIZE 16

#define	NB_LSP_COEFS 10

#define	MAX_CODED_SUPERFRAME_SIZE 16384

#define	MAX_CHANNELS 2

#define	NOISE_TAB_SIZE 8192

#define	LSP_POW_BITS 7

#define	VLCBITS 9

#define	VLCMAX ((22+VLCBITS-1)/VLCBITS)

Typedefs
typedef float	WMACoef
	type for decoded coefficients, int16_t would be enough for wma 1/2 More...

typedef struct CoefVLCTable	CoefVLCTable

typedef struct WMACodecContext	WMACodecContext

Functions
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. More...

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. More...

Variables
const uint16_t	ff_wma_critical_freqs [25]

const uint16_t	ff_wma_hgain_huffcodes [37]

const uint8_t	ff_wma_hgain_huffbits [37]

const float	ff_wma_lsp_codebook [NB_LSP_COEFS][16]

const uint32_t	ff_aac_scalefactor_code [121]

const uint8_t	ff_aac_scalefactor_bits [121]

Macro Definition Documentation

#define BLOCK_MAX_BITS 11

Definition at line 33 of file wma.h.

#define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)

Definition at line 34 of file wma.h.

#define BLOCK_MIN_BITS 7

Definition at line 32 of file wma.h.

Referenced by ff_wma_init().

#define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)

Definition at line 36 of file wma.h.

#define HIGH_BAND_MAX_SIZE 16

Definition at line 39 of file wma.h.

Referenced by wma_decode_block().

#define LSP_POW_BITS 7

Definition at line 50 of file wma.h.

Referenced by pow_m1_4(), and wma_lsp_to_curve_init().

#define MAX_CHANNELS 2

Definition at line 46 of file wma.h.

#define MAX_CODED_SUPERFRAME_SIZE 16384

Definition at line 44 of file wma.h.

Referenced by encode_init(), encode_superframe(), and wma_decode_superframe().

#define NB_LSP_COEFS 10

Definition at line 41 of file wma.h.

Referenced by decode_exp_lsp(), and wma_lsp_to_curve().

#define NOISE_TAB_SIZE 8192

Definition at line 48 of file wma.h.

Referenced by ff_wma_init(), and wma_decode_block().

#define VLCBITS 9

Definition at line 53 of file wma.h.

Referenced by ff_wma_run_level_decode(), and init_coef_vlc().

#define VLCMAX ((22+VLCBITS-1)/VLCBITS)

Definition at line 54 of file wma.h.

Referenced by ff_wma_run_level_decode().

Typedef Documentation

typedef struct CoefVLCTable CoefVLCTable

typedef struct WMACodecContext WMACodecContext

typedef float WMACoef

type for decoded coefficients, int16_t would be enough for wma 1/2

Definition at line 56 of file wma.h.

Function Documentation

int ff_wma_end ( AVCodecContext * avctx )

Definition at line 372 of file wma.c.

Referenced by encode_superframe(), and flush().

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 401 of file wma.c.

Referenced by decode_coeffs(), and ff_wma_run_level_decode().

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_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