hvirtual/libmpeg3/audio/layer3.c File Reference

#include "huffman.h"
#include "mpeg3private.h"
#include "mpeg3protos.h"
#include "tables.h"
#include <stdio.h>
#include <string.h>

Include dependency graph for layer3.c:

Go to the source code of this file.

Data Structures

struct gr_info_s

struct sideinfo_s

Defines

#define BITSHIFT ((sizeof(int32_t) - 1) * 8)

#define REFRESH_MASK

Functions

static int get_scale_factors_1 (mpeg3_layer_t *audio, int *scf, struct gr_info_s *gr_info, int ch, int gr)

static int get_scale_factors_2 (mpeg3_layer_t *audio, int *scf, struct gr_info_s *gr_info, int i_stereo)

static int dequantize_sample (mpeg3_layer_t *audio, float xr[SBLIMIT][SSLIMIT], int *scf, struct gr_info_s *gr_info, int sfreq, int part2bits)

static int get_side_info (mpeg3_layer_t *audio, struct sideinfo_s *si, int channels, int ms_stereo, long sfreq, int single, int lsf)

static int hybrid (mpeg3_layer_t *audio, float fsIn[SBLIMIT][SSLIMIT], float tsOut[SSLIMIT][SBLIMIT], int ch, struct gr_info_s *gr_info)

static int antialias (mpeg3_layer_t *audio, float xr[SBLIMIT][SSLIMIT], struct gr_info_s *gr_info)

static int calc_i_stereo (mpeg3_layer_t *audio, float xr_buf[2][SBLIMIT][SSLIMIT], int *scalefac, struct gr_info_s *gr_info, int sfreq, int ms_stereo, int lsf)

int mpeg3audio_dolayer3 (mpeg3_layer_t *audio, char *frame, int frame_size, float **output, int render)

void mpeg3_layer_reset (mpeg3_layer_t *audio)

int mpeg3_layer_check (unsigned char *data)

int mpeg3_layer_header (mpeg3_layer_t *audio, unsigned char *data)

mpeg3_layer_t * mpeg3_new_layer ()

void mpeg3_delete_layer (mpeg3_layer_t *audio)

Variables

static int pretab1 [22] = {0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,2,2,3,3,3,2,0}

static int pretab2 [22] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}

Define Documentation

#define BITSHIFT ((sizeof(int32_t) - 1) * 8)

Definition at line 223 of file layer3.c.

Referenced by dequantize_sample().

#define REFRESH_MASK

Value:

while(num < BITSHIFT) \
        { \
                mask |= mpeg3bits_getbits(audio->stream, 8) << (BITSHIFT - num); \
                num += 8; \
                part2remain -= 8; \
        }

Definition at line 224 of file layer3.c.

Referenced by dequantize_sample().

Function Documentation

static int antialias	(	mpeg3_layer_t *	audio,
		float	xr[SBLIMIT][SSLIMIT],
		struct gr_info_s *	gr_info
	)			`[static]`

Definition at line 865 of file layer3.c.

References gr_info_s::block_type, gr_info_s::maxb, gr_info_s::mixed_block_flag, mpeg3_aa_ca, and mpeg3_aa_cs.

Referenced by mpeg3audio_dolayer3(), and ShapeWipeMain::ShapeWipeMain().

static int calc_i_stereo	(	mpeg3_layer_t *	audio,
		float	xr_buf[2][SBLIMIT][SSLIMIT],
		int *	scalefac,
		struct gr_info_s *	gr_info,
		int	sfreq,
		int	ms_stereo,
		int	lsf
	)			`[static]`

Definition at line 915 of file layer3.c.

References gr_info_s::block_type, mpeg3_bandInfoStruct::longDiff, mpeg3_bandInfoStruct::longIdx, gr_info_s::maxband, gr_info_s::maxbandl, gr_info_s::mixed_block_flag, mpeg3_bandInfo, mpeg3_pow1_1, mpeg3_pow1_2, mpeg3_pow2_1, mpeg3_pow2_2, mpeg3_tan1_1, mpeg3_tan1_2, mpeg3_tan2_1, mpeg3_tan2_2, SBLIMIT, gr_info_s::scalefac_compress, mpeg3_bandInfoStruct::shortDiff, mpeg3_bandInfoStruct::shortIdx, t1, and t2.

Referenced by mpeg3audio_dolayer3().

static int dequantize_sample	(	mpeg3_layer_t *	audio,
		float	xr[SBLIMIT][SSLIMIT],
		int *	scf,
		struct gr_info_s *	gr_info,
		int	sfreq,
		int	part2bits
	)			`[static]`

Definition at line 233 of file layer3.c.

References a, gr_info_s::big_values, BITSHIFT, gr_info_s::block_type, cb, gr_info_s::count1table_select, gr_info_s::full_gain, mpeg3_bits_t::input_ptr, newhuff::linbits, gr_info_s::maxb, gr_info_s::maxband, gr_info_s::maxbandl, gr_info_s::mixed_block_flag, mpeg3_ht, mpeg3_htc, mpeg3_ispow, mpeg3_longLimit, mpeg3_map, mpeg3_mapend, mpeg3_shortLimit, mpeg3bits_getbitoffset(), mpeg3bits_getbits(), mpeg3bits_getbits_reverse(), mpeg3bits_start_forward(), mpeg3bits_start_reverse(), gr_info_s::part2_3_length, gr_info_s::pow2gain, gr_info_s::preflag, pretab, pretab1, pretab2, REFRESH_MASK, gr_info_s::region1start, gr_info_s::region2start, SBLIMIT, gr_info_s::scalefac_scale, shift(), step, mpeg3_layer_t::stream, newhuff::table, and gr_info_s::table_select.

Referenced by mpeg3audio_dolayer3().

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static int get_scale_factors_1	(	mpeg3_layer_t *	audio,
		int *	scf,
		struct gr_info_s *	gr_info,
		int	ch,
		int	gr
	)			`[static]`

Definition at line 49 of file layer3.c.

References gr_info_s::block_type, gr_info_s::mixed_block_flag, mpeg3bits_getbits(), gr_info_s::scalefac_compress, gr_info_s::scfsi, and mpeg3_layer_t::stream.

Referenced by mpeg3audio_dolayer3().

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static int get_scale_factors_2	(	mpeg3_layer_t *	audio,
		int *	scf,
		struct gr_info_s *	gr_info,
		int	i_stereo
	)			`[static]`

Definition at line 156 of file layer3.c.

References gr_info_s::block_type, gr_info_s::mixed_block_flag, mpeg3_i_slen2, mpeg3_n_slen2, mpeg3bits_getbits(), gr_info_s::preflag, gr_info_s::scalefac_compress, and mpeg3_layer_t::stream.

Referenced by mpeg3audio_dolayer3().

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static int get_side_info	(	mpeg3_layer_t *	audio,
		struct sideinfo_s *	si,
		int	channels,
		int	ms_stereo,
		long	sfreq,
		int	single,
		int	lsf
	)			`[static]`

Definition at line 705 of file layer3.c.

References gr_info_s::big_values, gr_info_s::block_type, sideinfo_s::ch, gr_info_s::count1table_select, fprintf, gr_info_s::full_gain, sideinfo_s::gr, mpeg3_bandInfoStruct::longIdx, sideinfo_s::main_data_begin, gr_info_s::mixed_block_flag, mpeg3_bandInfo, mpeg3_gainpow2, mpeg3bits_getbits(), gr_info_s::part2_3_length, gr_info_s::pow2gain, gr_info_s::preflag, sideinfo_s::private_bits, gr_info_s::region1start, gr_info_s::region2start, gr_info_s::scalefac_compress, gr_info_s::scalefac_scale, gr_info_s::scfsi, mpeg3_layer_t::stream, and gr_info_s::table_select.

Referenced by mpeg3audio_dolayer3().

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static int hybrid	(	mpeg3_layer_t *	audio,
		float	fsIn[SBLIMIT][SSLIMIT],
		float	tsOut[SSLIMIT][SBLIMIT],
		int	ch,
		struct gr_info_s *	gr_info
	)			`[static]`

Definition at line 806 of file layer3.c.

References b, gr_info_s::block_type, gr_info_s::maxb, gr_info_s::mixed_block_flag, mpeg3_layer_t::mp3_blc, mpeg3_layer_t::mp3_block, mpeg3_win, mpeg3_win1, mpeg3audio_dct12(), and mpeg3audio_dct36().

Referenced by mpeg3audio_dolayer3().

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void mpeg3_delete_layer ( mpeg3_layer_t * audio )

Definition at line 1546 of file layer3.c.

References mpeg3bits_delete_stream(), and mpeg3_layer_t::stream.

Referenced by delete_codec(), and delete_struct().

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int mpeg3_layer_check ( unsigned char * data )

Definition at line 1363 of file layer3.c.

Referenced by mpeg3_layer_header().

int mpeg3_layer_header	(	mpeg3_layer_t *	audio,
		unsigned char *	data
	)

Definition at line 1392 of file layer3.c.

References mpeg3_layer_t::bitrate, mpeg3_layer_t::bitrate_index, mpeg3_layer_t::channels, mpeg3_layer_t::copyright, mpeg3_layer_t::emphasis, mpeg3_layer_t::error_protection, mpeg3_layer_t::extension, mpeg3_layer_t::framesize, header, mpeg3_layer_t::layer, mpeg3_layer_t::lsf, MAXFRAMESIZE, mpeg3_layer_t::mode, mpeg3_layer_t::mode_ext, mpeg3_layer_t::mpeg35, mpeg3_freqs, mpeg3_layer_check(), mpeg3_tabsel_123, MPG_MD_MONO, mpeg3_layer_t::original, mpeg3_layer_t::padding, mpeg3_layer_t::prev_framesize, mpeg3_layer_t::samplerate, mpeg3_layer_t::sampling_frequency_code, mpeg3_layer_t::single, and mpeg3_layer_t::ssize.

Referenced by chunk_len(), decode(), read_header(), and write_frames().

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void mpeg3_layer_reset ( mpeg3_layer_t * audio )

Definition at line 1346 of file layer3.c.

References mpeg3_layer_t::first_frame, mpeg3_layer_t::mp3_blc, mpeg3_layer_t::mp3_block, and mpeg3audio_reset_synths().

Referenced by mpeg3audio_dolayer3(), and seek().

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mpeg3_layer_t* mpeg3_new_layer ( )

Definition at line 1533 of file layer3.c.

References mpeg3_layer_t::bo, mpeg3_layer_t::bsbuf, mpeg3_layer_t::bsspace, mpeg3_layer_t::channels, mpeg3_new_decode_tables(), mpeg3bits_new_stream(), and mpeg3_layer_t::stream.

Referenced by decode(), encode(), mpeg3audio_decode_audio(), and mpeg3audio_new().

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int mpeg3audio_dolayer3	(	mpeg3_layer_t *	audio,
		char *	frame,
		int	frame_size,
		float **	output,
		int	render
	)

Definition at line 1067 of file layer3.c.

References antialias(), mpeg3_layer_t::bsbuf, mpeg3_layer_t::bsbufold, mpeg3_layer_t::bsnum, mpeg3_layer_t::bsspace, calc_i_stereo(), sideinfo_s::ch, mpeg3_layer_t::channels, dequantize_sample(), mpeg3_layer_t::error_protection, mpeg3_layer_t::first_frame, get_scale_factors_1(), get_scale_factors_2(), get_side_info(), sideinfo_s::gr, hybrid(), mpeg3_layer_t::lsf, sideinfo_s::main_data_begin, gr_info_s::maxb, memcpy, mpeg3_layer_t::mode, mpeg3_layer_t::mode_ext, mpeg3_layer_reset(), mpeg3audio_synth_stereo(), mpeg3bits_getbits(), mpeg3bits_use_ptr(), MPG_MD_JOINT_STEREO, mpeg3_layer_t::prev_framesize, mpeg3_layer_t::sampling_frequency_code, SBLIMIT, mpeg3_layer_t::single, mpeg3_layer_t::ssize, SSLIMIT, and mpeg3_layer_t::stream.

Referenced by decode(), read_frame(), and write_frames().

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Variable Documentation

int pretab1[22] = {0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,2,2,3,3,3,2,0} [static]

Definition at line 214 of file layer3.c.

Referenced by dequantize_sample().

int pretab2[22] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0} [static]

Definition at line 215 of file layer3.c.

Referenced by dequantize_sample().


Data Structures
struct	gr_info_s
struct	sideinfo_s
Defines
#define	BITSHIFT ((sizeof(int32_t) - 1) * 8)
#define	REFRESH_MASK
Functions
static int	get_scale_factors_1 (mpeg3_layer_t audio, int scf, struct gr_info_s *gr_info, int ch, int gr)
static int	get_scale_factors_2 (mpeg3_layer_t audio, int scf, struct gr_info_s *gr_info, int i_stereo)
static int	dequantize_sample (mpeg3_layer_t audio, float xr[SBLIMIT][SSLIMIT], int scf, struct gr_info_s *gr_info, int sfreq, int part2bits)
static int	get_side_info (mpeg3_layer_t audio, struct sideinfo_s si, int channels, int ms_stereo, long sfreq, int single, int lsf)
static int	hybrid (mpeg3_layer_t audio, float fsIn[SBLIMIT][SSLIMIT], float tsOut[SSLIMIT][SBLIMIT], int ch, struct gr_info_s gr_info)
static int	antialias (mpeg3_layer_t audio, float xr[SBLIMIT][SSLIMIT], struct gr_info_s gr_info)
static int	calc_i_stereo (mpeg3_layer_t audio, float xr_buf[2][SBLIMIT][SSLIMIT], int scalefac, struct gr_info_s *gr_info, int sfreq, int ms_stereo, int lsf)
int	mpeg3audio_dolayer3 (mpeg3_layer_t audio, char frame, int frame_size, float **output, int render)
void	mpeg3_layer_reset (mpeg3_layer_t *audio)
int	mpeg3_layer_check (unsigned char *data)
int	mpeg3_layer_header (mpeg3_layer_t audio, unsigned char data)
mpeg3_layer_t *	mpeg3_new_layer ()
void	mpeg3_delete_layer (mpeg3_layer_t *audio)
Variables
static int	pretab1 [22] = {0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,2,2,3,3,3,2,0}
static int	pretab2 [22] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}