rtt-f030/bsp/stm32_radio/libwma/wmadec.h

150 lines
5.0 KiB
C
Raw Normal View History

/*
* 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 "wmabitstream.h" /* For GetBitContext */
#include "types.h"
//#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
/*define IRAM for targets with 48k/80k IRAM split*/
#ifndef IBSS_ATTR_WMA_LARGE_IRAM
#if (CONFIG_CPU == PP5022) || (CONFIG_CPU == PP5024)
/* PP5022/24 and MCF5250 have 128KB of IRAM, but only PP5022+ have 80KB allocated for codecs */
#define IBSS_ATTR_WMA_LARGE_IRAM IBSS_ATTR
#else
/* other PP's and MCF5249 have 96KB of IRAM */
#define IBSS_ATTR_WMA_LARGE_IRAM
#endif
#endif
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];
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, const uint8_t *buf, int buf_size);
int wma_decode_superframe_frame(WMADecodeContext* s, int32_t *samples, const uint8_t *buf, int buf_size);
#endif