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/**********************************************************************
** Copyright (C) 2000 Trolltech AS. All rights reserved.
**
** This file is part of Qtopia Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/
#ifndef MPEG3AUDIO_H
#define MPEG3AUDIO_H
#include "ac3.h"
#include "../bitstream.h"
typedef struct mpeg3_atrack_rec mpeg3_atrack_t;
#define MAXFRAMESIZE 1792
#define HDRCMPMASK 0xfffffd00
#define SBLIMIT 32
#define SSLIMIT 18
#define SCALE_BLOCK 12
#define MPEG3AUDIO_PADDING 1024
/* Values for mode */
#define MPG_MD_STEREO 0
#define MPG_MD_JOINT_STEREO 1
#define MPG_MD_DUAL_CHANNEL 2
#define MPG_MD_MONO 3
/* IMDCT variables */
typedef struct
{
mpeg3_real_t real;
mpeg3_real_t imag;
} mpeg3_complex_t;
#define AC3_N 512
struct al_table
{
short bits;
short d;
};
typedef struct
{
struct mpeg3_rec* file;
mpeg3_atrack_t* track;
mpeg3_bits_t *astream;
/* In order of importance */
int format; /* format of audio */
int layer; /* layer if mpeg */
int channels;
long outscale;
long framenum;
long prev_framesize;
long framesize; /* For mp3 current framesize without header. For AC3 current framesize with header. */
int avg_framesize; /* Includes the 4 byte header */
mpeg3_real_t *pcm_sample; /* Interlaced output from synthesizer in floats */
int pcm_point; /* Float offset in pcm_sample to write to */
long pcm_position; /* Sample start of pcm_samples in file */
long pcm_size; /* Number of pcm samples in the buffer */
long pcm_allocated; /* Allocated number of samples in pcm_samples */
int sample_seek;
double percentage_seek;
unsigned long oldhead;
unsigned long newhead;
unsigned long firsthead;
int bsnum;
int lsf;
int mpeg35;
int sampling_frequency_code;
int bitrate_index;
int bitrate;
int samples_per_frame;
int padding;
int extension;
int mode;
int mode_ext;
int copyright;
int original;
int emphasis;
int error_protection;
/* Back step buffers for mp3 */
unsigned char bsspace[2][MAXFRAMESIZE + 512]; /* MAXFRAMESIZE */
unsigned char *bsbuf, *bsbufold;
long ssize;
int init;
int single;
struct al_table *alloc;
int II_sblimit;
int jsbound;
int bo; /* Static variable in synthesizer */
/* MP3 Static arrays here */
mpeg3_real_t synth_stereo_buffs[2][2][0x110];
mpeg3_real_t synth_mono_buff[64];
unsigned int layer2_scfsi_buf[64];
mpeg3_real_t mp3_block[2][2][SBLIMIT * SSLIMIT];
int mp3_blc[2];
/* AC3 specific stuff. AC3 also shares objects with MPEG */
unsigned int ac3_framesize_code;
mpeg3_ac3bsi_t ac3_bsi;
mpeg3_ac3audblk_t ac3_audblk;
mpeg3_ac3_bitallocation_t ac3_bit_allocation;
mpeg3_ac3_mantissa_t ac3_mantissa;
mpeg3_complex_t ac3_imdct_buf[AC3_N / 4];
/* Delay buffer for DCT interleaving */
mpeg3_real_t ac3_delay[6][AC3_N / 2];
/* Twiddle factor LUT */
mpeg3_complex_t *ac3_w[7];
#if !defined(USE_FIXED_POINT) || defined(PRINT_FIXED_POINT_TABLES)
/* Just for allocated memory */
mpeg3_complex_t ac3_w_1[1];
mpeg3_complex_t ac3_w_2[2];
mpeg3_complex_t ac3_w_4[4];
mpeg3_complex_t ac3_w_8[8];
mpeg3_complex_t ac3_w_16[16];
mpeg3_complex_t ac3_w_32[32];
mpeg3_complex_t ac3_w_64[64];
#endif
int ac3_lfsr_state;
unsigned char ac3_buffer[MAX_AC3_FRAMESIZE];
mpeg3ac3_stream_samples_t ac3_samples;
} mpeg3audio_t;
#endif
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