modules/codec/wmafixed/wmadec.h

   1 /*
   2  * WMA compatible decoder
   3  * Copyright (c) 2002 The FFmpeg Project.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #ifndef _WMADEC_H
  21 #define _WMADEC_H
  22
  23 #include <inttypes.h>
  24
  25 #include "asf.h"
  26 #include "bitstream.h" /* For GetBitContext */
  27 #include "mdct.h"
  28
  29 #undef TRACE
  30
  31 /* size of blocks */
  32 #define BLOCK_MIN_BITS 7
  33 #define BLOCK_MAX_BITS 11
  34 #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
  35
  36 #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
  37
  38 /* XXX: find exact max size */
  39 #define HIGH_BAND_MAX_SIZE 16
  40
  41 #define NB_LSP_COEFS 10
  42
  43 /* XXX: is it a suitable value ? */
  44 #define MAX_CODED_SUPERFRAME_SIZE 16384
  45
  46 #define M_PI    3.14159265358979323846
  47
  48 #define M_PI_F  0x3243f // in fixed 32 format
  49 #define TWO_M_PI_F  0x6487f   //in fixed 32
  50
  51 #define MAX_CHANNELS 2
  52
  53 #define NOISE_TAB_SIZE 8192
  54
  55 #define LSP_POW_BITS 7
  56
  57 typedef struct WMADecodeContext
  58 {
  59     GetBitContext gb;
  60
  61     int nb_block_sizes;  /* number of block sizes */
  62
  63     int sample_rate;
  64     int nb_channels;
  65     int bit_rate;
  66     int version; /* 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) */
  67     int block_align;
  68     int use_bit_reservoir;
  69     int use_variable_block_len;
  70     int use_exp_vlc;  /* exponent coding: 0 = lsp, 1 = vlc + delta */
  71     int use_noise_coding; /* true if perceptual noise is added */
  72     int byte_offset_bits;
  73     VLC exp_vlc;
  74     int exponent_sizes[BLOCK_NB_SIZES];
  75     uint16_t exponent_bands[BLOCK_NB_SIZES][25];
  76     int high_band_start[BLOCK_NB_SIZES]; /* index of first coef in high band */
  77     int coefs_start;               /* first coded coef */
  78     int coefs_end[BLOCK_NB_SIZES]; /* max number of coded coefficients */
  79     int exponent_high_sizes[BLOCK_NB_SIZES];
  80     int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
  81     VLC hgain_vlc;
  82
  83     /* coded values in high bands */
  84     int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
  85     int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
  86
  87     /* there are two possible tables for spectral coefficients */
  88     VLC coef_vlc[2];
  89     uint16_t *run_table[2];
  90     uint16_t *level_table[2];
  91     /* frame info */
  92     int frame_len;       /* frame length in samples */
  93     int frame_len_bits;  /* frame_len = 1 << frame_len_bits */
  94
  95     /* block info */
  96     int reset_block_lengths;
  97     int block_len_bits; /* log2 of current block length */
  98     int next_block_len_bits; /* log2 of next block length */
  99     int prev_block_len_bits; /* log2 of prev block length */
 100     int block_len; /* block length in samples */
 101     int block_num; /* block number in current frame */
 102     int block_pos; /* current position in frame */
 103     uint8_t ms_stereo; /* true if mid/side stereo mode */
 104     uint8_t channel_coded[MAX_CHANNELS]; /* true if channel is coded */
 105     int exponents_bsize[MAX_CHANNELS];      // log2 ratio frame/exp. length
 106     int32_t exponents[MAX_CHANNELS][BLOCK_MAX_SIZE];
 107     int32_t max_exponent[MAX_CHANNELS];
 108     int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
 109     int32_t (*coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
 110     MDCTContext mdct_ctx[BLOCK_NB_SIZES];
 111     int32_t *windows[BLOCK_NB_SIZES];
 112     /* output buffer for one frame and the last for IMDCT windowing */
 113     int32_t frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
 114     /* last frame info */
 115     uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
 116     int last_bitoffset;
 117     int last_superframe_len;
 118     int32_t *noise_table;
 119     int noise_index;
 120     int32_t noise_mult; /* XXX: suppress that and integrate it in the noise array */
 121     /* lsp_to_curve tables */
 122     int32_t lsp_cos_table[BLOCK_MAX_SIZE];
 123     int64_t lsp_pow_e_table[256];
 124     int32_t lsp_pow_m_table1[(1 << LSP_POW_BITS)];
 125     int32_t lsp_pow_m_table2[(1 << LSP_POW_BITS)];
 126
 127     /* State of current superframe decoding */
 128     int bit_offset;
 129     int nb_frames;
 130     int current_frame;
 131
 132 #ifdef TRACE
 133
 134     int frame_count;
 135 #endif
 136 }
 137 WMADecodeContext;
 138
 139 int wma_decode_init(WMADecodeContext* s, asf_waveformatex_t *wfx);
 140 int wma_decode_superframe_init(WMADecodeContext* s,
 141                                uint8_t *buf, int buf_size);
 142 int wma_decode_superframe_frame(WMADecodeContext* s,
 143                                 int32_t *samples,
 144                                 uint8_t *buf, int buf_size);
 145 #endif