b8753ffdaa
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14941 a1c6a512-1295-4272-9138-f99709370657
145 lines
4.8 KiB
C
145 lines
4.8 KiB
C
/*
|
|
* WMA compatible decoder
|
|
* Copyright (c) 2002 The FFmpeg Project.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#ifndef _WMADEC_H
|
|
#define _WMADEC_H
|
|
|
|
#include "asf.h"
|
|
#include "bitstream.h" /* For GetBitContext */
|
|
#include "types.h"
|
|
#include "mdct.h"
|
|
//#include "dsputil.h" /* For MDCTContext */
|
|
|
|
|
|
//#define TRACE
|
|
/* size of blocks */
|
|
#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)
|
|
|
|
/* XXX: find exact max size */
|
|
#define HIGH_BAND_MAX_SIZE 16
|
|
|
|
#define NB_LSP_COEFS 10
|
|
|
|
/* XXX: is it a suitable value ? */
|
|
#define MAX_CODED_SUPERFRAME_SIZE 16384
|
|
|
|
#define M_PI 3.14159265358979323846
|
|
|
|
#define M_PI_F 0x3243f // in fixed 32 format
|
|
#define TWO_M_PI_F 0x6487f //in fixed 32
|
|
|
|
#define MAX_CHANNELS 2
|
|
|
|
#define NOISE_TAB_SIZE 8192
|
|
|
|
#define LSP_POW_BITS 7
|
|
|
|
typedef struct WMADecodeContext
|
|
{
|
|
GetBitContext gb;
|
|
|
|
int nb_block_sizes; /* number of block sizes */
|
|
|
|
int sample_rate;
|
|
int nb_channels;
|
|
int bit_rate;
|
|
int version; /* 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) */
|
|
int block_align;
|
|
int use_bit_reservoir;
|
|
int use_variable_block_len;
|
|
int use_exp_vlc; /* exponent coding: 0 = lsp, 1 = vlc + delta */
|
|
int use_noise_coding; /* true if perceptual noise is added */
|
|
int byte_offset_bits;
|
|
VLC exp_vlc;
|
|
int exponent_sizes[BLOCK_NB_SIZES];
|
|
uint16_t exponent_bands[BLOCK_NB_SIZES][25];
|
|
int high_band_start[BLOCK_NB_SIZES]; /* index of first coef in high band */
|
|
int coefs_start; /* first coded coef */
|
|
int coefs_end[BLOCK_NB_SIZES]; /* max number of coded coefficients */
|
|
int exponent_high_sizes[BLOCK_NB_SIZES];
|
|
int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
|
|
VLC hgain_vlc;
|
|
|
|
/* coded values in high bands */
|
|
int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
|
|
int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
|
|
|
|
/* there are two possible tables for spectral coefficients */
|
|
VLC coef_vlc[2];
|
|
uint16_t *run_table[2];
|
|
uint16_t *level_table[2];
|
|
/* frame info */
|
|
int frame_len; /* frame length in samples */
|
|
int frame_len_bits; /* frame_len = 1 << frame_len_bits */
|
|
|
|
/* block info */
|
|
int reset_block_lengths;
|
|
int block_len_bits; /* log2 of current block length */
|
|
int next_block_len_bits; /* log2 of next block length */
|
|
int prev_block_len_bits; /* log2 of prev block length */
|
|
int block_len; /* block length in samples */
|
|
int block_num; /* block number in current frame */
|
|
int block_pos; /* current position in frame */
|
|
uint8_t ms_stereo; /* true if mid/side stereo mode */
|
|
uint8_t channel_coded[MAX_CHANNELS]; /* true if channel is coded */
|
|
int exponents_bsize[MAX_CHANNELS]; // log2 ratio frame/exp. length
|
|
fixed32 exponents[MAX_CHANNELS][BLOCK_MAX_SIZE];
|
|
fixed32 max_exponent[MAX_CHANNELS];
|
|
int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
|
|
fixed32 (*coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
|
|
MDCTContext mdct_ctx[BLOCK_NB_SIZES];
|
|
fixed32 *windows[BLOCK_NB_SIZES];
|
|
/* output buffer for one frame and the last for IMDCT windowing */
|
|
fixed32 frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
|
|
/* last frame info */
|
|
uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
|
|
int last_bitoffset;
|
|
int last_superframe_len;
|
|
fixed32 *noise_table;
|
|
int noise_index;
|
|
fixed32 noise_mult; /* XXX: suppress that and integrate it in the noise array */
|
|
/* lsp_to_curve tables */
|
|
fixed32 lsp_cos_table[BLOCK_MAX_SIZE];
|
|
fixed64 lsp_pow_e_table[256];
|
|
fixed32 lsp_pow_m_table1[(1 << LSP_POW_BITS)];
|
|
fixed32 lsp_pow_m_table2[(1 << LSP_POW_BITS)];
|
|
|
|
/* State of current superframe decoding */
|
|
int bit_offset;
|
|
int nb_frames;
|
|
int current_frame;
|
|
|
|
#ifdef TRACE
|
|
|
|
int frame_count;
|
|
#endif
|
|
}
|
|
WMADecodeContext;
|
|
|
|
int wma_decode_init(WMADecodeContext* s, asf_waveformatex_t *wfx);
|
|
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);
|
|
#endif
|