apps/codecs/libwma/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 "asf.h"
  24 #include "bitstream.h" /* For GetBitContext */
  25 #include "types.h"
  26
  27 //#define TRACE
  28 /* size of blocks */
  29 #define BLOCK_MIN_BITS 7
  30 #define BLOCK_MAX_BITS 11
  31 #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
  32
  33 #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
  34
  35 /* XXX: find exact max size */
  36 #define HIGH_BAND_MAX_SIZE 16
  37
  38 #define NB_LSP_COEFS 10
  39
  40 /* XXX: is it a suitable value ? */
  41 #define MAX_CODED_SUPERFRAME_SIZE 16384
  42
  43 #define M_PI    3.14159265358979323846
  44
  45 #define M_PI_F  0x3243f // in fixed 32 format
  46 #define TWO_M_PI_F  0x6487f   //in fixed 32
  47
  48 #define MAX_CHANNELS 2
  49
  50 #define NOISE_TAB_SIZE 8192
  51
  52 #define LSP_POW_BITS 7
  53
  54 /*define IRAM for targets with 48k/80k IRAM split*/
  55 #ifndef IBSS_ATTR_WMA_LARGE_IRAM
  56 #if (CONFIG_CPU == PP5022) || (CONFIG_CPU == PP5024) || defined(CPU_S5L870X) ||
  57     (CONFIG_CPU == MCF5250)
  58 /* PP5022/24, MCF5250 have 128KB of IRAM. 80KB are allocated for codecs */
  59 #define IBSS_ATTR_WMA_LARGE_IRAM IBSS_ATTR
  60 #else
  61 /* other PP's and MCF5249 have 96KB of IRAM */
  62 #define IBSS_ATTR_WMA_LARGE_IRAM
  63 #endif
  64 #endif
  65
  66 #define VLCBITS 7       /*7 is the lowest without glitching*/
  67 #define VLCMAX ((22+VLCBITS-1)/VLCBITS)
  68
  69 #define EXPVLCBITS 7
  70 #define EXPMAX ((19+EXPVLCBITS-1)/EXPVLCBITS)
  71
  72 #define HGAINVLCBITS 9
  73 #define HGAINMAX ((13+HGAINVLCBITS-1)/HGAINVLCBITS)
  74
  75
  76 typedef struct CoefVLCTable
  77 {
  78     int n;                               /* total number of codes */
  79     const uint32_t *huffcodes;           /* VLC bit values */
  80     const uint8_t *huffbits;             /* VLC bit size */
  81     const uint16_t *levels;              /* table to build run/level tables */
  82 }
  83 CoefVLCTable;
  84
  85 typedef struct WMADecodeContext
  86 {
  87     GetBitContext gb;
  88
  89     int nb_block_sizes;  /* number of block sizes */
  90
  91     int sample_rate;
  92     int nb_channels;
  93     int bit_rate;
  94     int version; /* 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) */
  95     int block_align;
  96     int use_bit_reservoir;
  97     int use_variable_block_len;
  98     int use_exp_vlc;  /* exponent coding: 0 = lsp, 1 = vlc + delta */
  99     int use_noise_coding; /* true if perceptual noise is added */
 100     int byte_offset_bits;
 101     VLC exp_vlc;
 102     int exponent_sizes[BLOCK_NB_SIZES];
 103     uint16_t exponent_bands[BLOCK_NB_SIZES][25];
 104     int high_band_start[BLOCK_NB_SIZES]; /* index of first coef in high band */
 105     int coefs_start;               /* first coded coef */
 106     int coefs_end[BLOCK_NB_SIZES]; /* max number of coded coefficients */
 107     int exponent_high_sizes[BLOCK_NB_SIZES];
 108     int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
 109     VLC hgain_vlc;
 110
 111     /* coded values in high bands */
 112     int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
 113     int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
 114
 115     /* there are two possible tables for spectral coefficients */
 116     VLC coef_vlc[2];
 117     uint16_t *run_table[2];
 118     uint16_t *level_table[2];
 119     /* frame info */
 120     int frame_len;       /* frame length in samples */
 121     int frame_len_bits;  /* frame_len = 1 << frame_len_bits */
 122
 123     /* block info */
 124     int reset_block_lengths;
 125     int block_len_bits; /* log2 of current block length */
 126     int next_block_len_bits; /* log2 of next block length */
 127     int prev_block_len_bits; /* log2 of prev block length */
 128     int block_len; /* block length in samples */
 129     int block_num; /* block number in current frame */
 130     int block_pos; /* current position in frame */
 131     uint8_t ms_stereo; /* true if mid/side stereo mode */
 132     uint8_t channel_coded[MAX_CHANNELS]; /* true if channel is coded */
 133     int exponents_bsize[MAX_CHANNELS];      // log2 ratio frame/exp. length
 134     fixed32 exponents[MAX_CHANNELS][BLOCK_MAX_SIZE];
 135     fixed32 max_exponent[MAX_CHANNELS];
 136     int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
 137     fixed32 (*coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
 138     fixed32 *windows[BLOCK_NB_SIZES];
 139     /* output buffer for one frame and the last for IMDCT windowing */
 140     fixed32 (*frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE*2];
 141
 142     /* last frame info */
 143     uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
 144     int last_bitoffset;
 145     int last_superframe_len;
 146     fixed32 *noise_table;
 147     int noise_index;
 148     fixed32 noise_mult; /* XXX: suppress that and integrate it in the noise array */
 149     /* lsp_to_curve tables */
 150     fixed32 lsp_cos_table[BLOCK_MAX_SIZE];
 151     fixed64 lsp_pow_e_table[256];
 152     fixed32 lsp_pow_m_table1[(1 << LSP_POW_BITS)];
 153     fixed32 lsp_pow_m_table2[(1 << LSP_POW_BITS)];
 154
 155     /* State of current superframe decoding */
 156     int bit_offset;
 157     int nb_frames;
 158     int current_frame;
 159
 160 #ifdef TRACE
 161
 162     int frame_count;
 163 #endif
 164 }
 165 WMADecodeContext;
 166
 167 int wma_decode_init(WMADecodeContext* s, asf_waveformatex_t *wfx);
 168 int wma_decode_superframe_init(WMADecodeContext* s,
 169                                const uint8_t *buf, int buf_size);
 170 int wma_decode_superframe_frame(WMADecodeContext* s,
 171                                 int32_t *samples,
 172                                 const uint8_t *buf, int buf_size);
 173 #endif