wmadeci.c File Reference

Include dependency graph for wmadeci.c:

Data Structures
struct	CoefVLCTable
Defines
#define	IBSS_ATTR
#define	ICONST_ATTR
#define	ICODE_ATTR
#define	VLCBITS   7
#define	VLCMAX   ((22+VLCBITS-1)/VLCBITS)
#define	EXPVLCBITS   7
#define	EXPMAX   ((19+EXPVLCBITS-1)/EXPVLCBITS)
#define	HGAINVLCBITS   9
#define	HGAINMAX   ((13+HGAINVLCBITS-1)/HGAINVLCBITS)
#define	VLCBUF1SIZE   4598
#define	VLCBUF2SIZE   3574
#define	VLCBUF3SIZE   360
#define	VLCBUF4SIZE   540
Functions
static void	wma_lsp_to_curve_init (WMADecodeContext *s, int frame_len)
static void	vector_fmul_add_add (int32_t *dst, const int32_t *src0, const int32_t *src1, int len)
static void	vector_fmul_reverse (int32_t *dst, const int32_t *src0, const int32_t *src1, int len)
static void	wma_window (WMADecodeContext *s, int32_t *in, int32_t *out)
	Apply MDCT window and add into output.
static void	init_coef_vlc (VLC *vlc, uint16_t **prun_table, uint16_t **plevel_table, const CoefVLCTable *vlc_table, int tab)
int	wma_decode_init (WMADecodeContext *s, asf_waveformatex_t *wfx)
static int32_t	pow_m1_4 (WMADecodeContext *s, int32_t x)
static void	wma_lsp_to_curve (WMADecodeContext *s, int32_t *out, int32_t *val_max_ptr, int n, int32_t *lsp)
static void	decode_exp_lsp (WMADecodeContext *s, int ch)
static int	decode_exp_vlc (WMADecodeContext *s, int ch)
static int	wma_decode_block (WMADecodeContext *s)
static int	wma_decode_frame (WMADecodeContext *s, int32_t *samples)
int	wma_decode_superframe_init (WMADecodeContext *s, uint8_t *buf, int buf_size)
int	wma_decode_superframe_frame (WMADecodeContext *s, int32_t *samples, uint8_t *buf, int buf_size)
Variables
int32_t	coefsarray [2][(1<< 11)]
int32_t	stat0 [2048]
int32_t	stat1 [1024]
int32_t	stat2 [512]
int32_t	stat3 [256]
int32_t	stat4 [128]
uint16_t *	runtabarray [2]
uint16_t *	levtabarray [2]
uint16_t	runtab0 [1336]
uint16_t	runtab1 [1336]
uint16_t	levtab0 [1336]
uint16_t	levtab1 [1336]
int16_t	vlcbuf1 [4598][2]
int16_t	vlcbuf2 [3574][2]
int16_t	vlcbuf3 [360][2]
int16_t	vlcbuf4 [540][2]

---

Define Documentation

#define EXPMAX   ((19+EXPVLCBITS-1)/EXPVLCBITS)

Referenced by decode_exp_vlc().

#define EXPVLCBITS   7

Referenced by decode_exp_vlc(), and wma_decode_init().

#define HGAINMAX   ((13+HGAINVLCBITS-1)/HGAINVLCBITS)

Referenced by wma_decode_block().

#define HGAINVLCBITS   9

Referenced by wma_decode_block(), and wma_decode_init().

#define IBSS_ATTR

#define ICODE_ATTR

#define ICONST_ATTR

#define VLCBITS   7

Referenced by init_coef_vlc(), and wma_decode_block().

#define VLCBUF1SIZE   4598

Referenced by wma_decode_init().

#define VLCBUF2SIZE   3574

Referenced by wma_decode_init().

#define VLCBUF3SIZE   360

Referenced by wma_decode_init().

#define VLCBUF4SIZE   540

Referenced by wma_decode_init().

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

Referenced by wma_decode_block().

---

Function Documentation

static void decode_exp_lsp	(	WMADecodeContext *	s,
		int	ch
	)			[static]

References WMADecodeContext::block_len, WMADecodeContext::exponents, WMADecodeContext::gb, get_bits(), i, lsp_codebook, WMADecodeContext::max_exponent, NB_LSP_COEFS, and wma_lsp_to_curve().

Referenced by wma_decode_block().

static int decode_exp_vlc	(	WMADecodeContext *	s,
		int	ch
	)			[static]

References WMADecodeContext::block_len, WMADecodeContext::block_len_bits, WMADecodeContext::exp_vlc, EXPMAX, WMADecodeContext::exponent_bands, WMADecodeContext::exponents, EXPVLCBITS, WMADecodeContext::frame_len_bits, WMADecodeContext::gb, get_bits(), get_vlc2(), WMADecodeContext::max_exponent, pow_10_to_yover16, VLC::table, and WMADecodeContext::version.

Referenced by wma_decode_block().

static void init_coef_vlc	(	VLC *	vlc,
		uint16_t **	prun_table,
		uint16_t **	plevel_table,
		const CoefVLCTable *	vlc_table,
		int	tab
	)			[static]

References CoefVLCTable::huffbits, CoefVLCTable::huffcodes, i, init_vlc(), CoefVLCTable::levels, levtabarray, CoefVLCTable::n, runtabarray, and VLCBITS.

Referenced by wma_decode_init().

static int32_t pow_m1_4	(	WMADecodeContext *	s,
		int32_t	x
	)			[inline, static]

References a, b, fixmul32(), fixtof64, ftofix32, LSP_POW_BITS, lsp_pow_e_table, WMADecodeContext::lsp_pow_m_table1, and WMADecodeContext::lsp_pow_m_table2.

Referenced by wma_lsp_to_curve().

static void vector_fmul_add_add	(	int32_t *	dst,
		const int32_t *	src0,
		const int32_t *	src1,
		int	len
	)			[inline, static]

References fixmul32b(), and i.

Referenced by wma_window().

static void vector_fmul_reverse	(	int32_t *	dst,
		const int32_t *	src0,
		const int32_t *	src1,
		int	len
	)			[inline, static]

References fixmul32b(), and i.

Referenced by wma_window().

static int wma_decode_block

(

WMADecodeContext *

s

)

[static]

References a, align_get_bits(), av_log2(), b, WMADecodeContext::block_len, WMADecodeContext::block_len_bits, BLOCK_MAX_SIZE, WMADecodeContext::block_num, WMADecodeContext::block_pos, WMADecodeContext::channel_coded, WMADecodeContext::coef_vlc, WMADecodeContext::coefs, WMADecodeContext::coefs1, WMADecodeContext::coefs_end, WMADecodeContext::coefs_start, decode_exp_lsp(), decode_exp_vlc(), WMADecodeContext::exponent_high_bands, WMADecodeContext::exponent_high_sizes, WMADecodeContext::exponents, WMADecodeContext::exponents_bsize, ff_imdct_calc(), fixdiv32(), fixdiv64(), Fixed32From64(), Fixed32To64(), fixmul32(), fixsqrt32(), fixtoi32, WMADecodeContext::frame_len, WMADecodeContext::frame_len_bits, WMADecodeContext::frame_out, WMADecodeContext::gb, get_bits(), get_vlc2(), WMADecodeContext::hgain_vlc, HGAINMAX, HGAINVLCBITS, WMADecodeContext::high_band_coded, HIGH_BAND_MAX_SIZE, WMADecodeContext::high_band_start, WMADecodeContext::high_band_values, i, IBSS_ATTR, index, itofix32, WMADecodeContext::level_table, MAX_CHANNELS, WMADecodeContext::max_exponent, WMADecodeContext::mdct_ctx, WMADecodeContext::ms_stereo, WMADecodeContext::nb_block_sizes, WMADecodeContext::nb_channels, next(), WMADecodeContext::next_block_len_bits, WMADecodeContext::noise_index, WMADecodeContext::noise_mult, NOISE_TAB_SIZE, WMADecodeContext::noise_table, pow_table, PRECISION, WMADecodeContext::prev_block_len_bits, WMADecodeContext::reset_block_lengths, run(), WMADecodeContext::run_table, VLC::table, WMADecodeContext::use_exp_vlc, WMADecodeContext::use_noise_coding, WMADecodeContext::use_variable_block_len, WMADecodeContext::version, VLCBITS, VLCMAX, and wma_window().

Referenced by wma_decode_frame().

static int wma_decode_frame	(	WMADecodeContext *	s,
		int32_t *	samples
	)			[static]

References WMADecodeContext::block_num, WMADecodeContext::block_pos, WMADecodeContext::frame_len, WMADecodeContext::frame_out, i, WMADecodeContext::nb_channels, and wma_decode_block().

Referenced by wma_decode_superframe_frame().

int wma_decode_init	(	WMADecodeContext *	s,
		asf_waveformatex_t *	wfx
	)

References a, ASF_CODEC_ID_WMAV1, ASF_CODEC_ID_WMAV2, av_log2(), b, WMADecodeContext::bit_rate, asf_waveformatex_s::bitrate, WMADecodeContext::block_align, BLOCK_MIN_BITS, asf_waveformatex_s::blockalign, WMADecodeContext::byte_offset_bits, asf_waveformatex_s::channels, asf_waveformatex_s::codec_id, WMADecodeContext::coef_vlc, coef_vlcs, WMADecodeContext::coefs, WMADecodeContext::coefs_end, WMADecodeContext::coefs_start, coefsarray, asf_waveformatex_s::data, asf_waveformatex_s::datalen, WMADecodeContext::exp_vlc, exponent_band_22050, exponent_band_32000, exponent_band_44100, WMADecodeContext::exponent_bands, WMADecodeContext::exponent_high_bands, WMADecodeContext::exponent_high_sizes, WMADecodeContext::exponent_sizes, EXPVLCBITS, ff_mdct_init(), fixdiv32(), fixdiv64(), fixmul32(), fixtoi32, fixtoi64, WMADecodeContext::frame_len, WMADecodeContext::frame_len_bits, fsincos(), hgain_huffbits, hgain_huffcodes, WMADecodeContext::hgain_vlc, HGAINVLCBITS, WMADecodeContext::high_band_start, i, init_coef_vlc(), init_vlc(), itofix32, itofix64, WMADecodeContext::last_bitoffset, WMADecodeContext::last_superframe_len, WMADecodeContext::level_table, levtab0, levtab1, levtabarray, WMADecodeContext::mdct_ctx, mdct_init_global(), WMADecodeContext::nb_block_sizes, WMADecodeContext::nb_channels, WMADecodeContext::noise_mult, NOISE_TAB_SIZE, WMADecodeContext::noise_table, noisetable_exp, asf_waveformatex_s::rate, WMADecodeContext::reset_block_lengths, WMADecodeContext::run_table, runtab0, runtab1, runtabarray, WMADecodeContext::sample_rate, scale_huffbits, scale_huffcodes, stat0, stat1, stat2, stat3, stat4, VLC::table, VLC::table_allocated, WMADecodeContext::use_bit_reservoir, WMADecodeContext::use_exp_vlc, WMADecodeContext::use_noise_coding, WMADecodeContext::use_variable_block_len, WMADecodeContext::version, vlcbuf1, VLCBUF1SIZE, vlcbuf2, VLCBUF2SIZE, vlcbuf3, VLCBUF3SIZE, vlcbuf4, VLCBUF4SIZE, WMADecodeContext::windows, wma_critical_freqs, and wma_lsp_to_curve_init().

Referenced by OpenDecoder().

int wma_decode_superframe_frame	(	WMADecodeContext *	s,
		int32_t *	samples,
		uint8_t *	buf,
		int	buf_size
	)

References WMADecodeContext::bit_offset, WMADecodeContext::byte_offset_bits, WMADecodeContext::current_frame, WMADecodeContext::frame_len, WMADecodeContext::gb, get_bits(), get_bits_count(), init_get_bits(), WMADecodeContext::last_bitoffset, WMADecodeContext::last_superframe, WMADecodeContext::last_superframe_len, MAX_CODED_SUPERFRAME_SIZE, WMADecodeContext::nb_frames, WMADecodeContext::reset_block_lengths, skip_bits(), WMADecodeContext::use_bit_reservoir, and wma_decode_frame().

Referenced by DecodeFrame().

int wma_decode_superframe_init	(	WMADecodeContext *	s,
		uint8_t *	buf,
		int	buf_size
	)

References WMADecodeContext::bit_offset, WMADecodeContext::byte_offset_bits, WMADecodeContext::current_frame, WMADecodeContext::gb, get_bits(), init_get_bits(), WMADecodeContext::last_superframe_len, WMADecodeContext::nb_frames, and WMADecodeContext::use_bit_reservoir.

Referenced by DecodeFrame().

static void wma_lsp_to_curve	(	WMADecodeContext *	s,
		int32_t *	out,
		int32_t *	val_max_ptr,
		int	n,
		int32_t *	lsp
	)			[static]

References fixmul32(), fixmul32b(), i, WMADecodeContext::lsp_cos_table, NB_LSP_COEFS, and pow_m1_4().

Referenced by decode_exp_lsp().

static void wma_lsp_to_curve_init	(	WMADecodeContext *	s,
		int	frame_len
	)			[static]

References a, b, fixdiv32(), fsincos(), i, itofix32, WMADecodeContext::lsp_cos_table, LSP_POW_BITS, WMADecodeContext::lsp_pow_m_table1, WMADecodeContext::lsp_pow_m_table2, M_PI_F, and pow_a_table.

Referenced by wma_decode_init().

static void wma_window	(	WMADecodeContext *	s,
		int32_t *	in,
		int32_t *	out
	)			[static]

Apply MDCT window and add into output.

We ensure that when the windows overlap their squared sum is always 1 (MDCT reconstruction rule).

The Vorbis I spec has a great diagram explaining this process. See section 1.3.2.3 of http://xiph.org/vorbis/doc/Vorbis_I_spec.html

References WMADecodeContext::block_len, WMADecodeContext::block_len_bits, WMADecodeContext::frame_len_bits, WMADecodeContext::next_block_len_bits, WMADecodeContext::prev_block_len_bits, vector_fmul_add_add(), vector_fmul_reverse(), and WMADecodeContext::windows.

Referenced by wma_decode_block().

---

Variable Documentation

int32_t coefsarray[2][(1<< 11)]

Referenced by wma_decode_init().

uint16_t levtab0[1336]

Referenced by wma_decode_init().

uint16_t levtab1[1336]

Referenced by wma_decode_init().

uint16_t * levtabarray[2]

Referenced by init_coef_vlc(), and wma_decode_init().

uint16_t runtab0[1336]

Referenced by wma_decode_init().

uint16_t runtab1[1336]

Referenced by wma_decode_init().

uint16_t* runtabarray[2]

Referenced by init_coef_vlc(), and wma_decode_init().

int32_t stat0[2048]

Referenced by wma_decode_init().

int32_t stat1[1024]

Referenced by wma_decode_init().

int32_t stat2[512]

Referenced by wma_decode_init().

int32_t stat3[256]

Referenced by wma_decode_init().

int32_t stat4[128]

Referenced by wma_decode_init().

int16_t vlcbuf1[4598][2]

Referenced by wma_decode_init().

int16_t vlcbuf2[3574][2]

Referenced by wma_decode_init().

int16_t vlcbuf3[360][2]

Referenced by wma_decode_init().

int16_t vlcbuf4[540][2]

Referenced by wma_decode_init().