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 #include "mdct.h"
  27 //#include "dsputil.h"  /* For MDCTContext */
  28
  29
  30 //#define TRACE
  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 /*define IRAM for targets with 48k/80k IRAM split*/
  58 #ifndef IBSS_ATTR_WMA_LARGE_IRAM
  59 #if (CONFIG_CPU == PP5022) || (CONFIG_CPU == PP5024) || (CONFIG_CPU == MCF5250)
  60 /* PP5022/24 and MCF5250 have 128KB of IRAM, with 80KB allocated for codecs */
  61 #define IBSS_ATTR_WMA_LARGE_IRAM IBSS_ATTR
  62 #else
  63 /* other PP's and MCF5249 have 96KB of IRAM */
  64 #define IBSS_ATTR_WMA_LARGE_IRAM
  65 #endif
  66 #endif
  67
  68 typedef struct WMADecodeContext
  69 {
  70     GetBitContext gb;
  71
  72     int nb_block_sizes;  /* number of block sizes */
  73
  74     int sample_rate;
  75     int nb_channels;
  76     int bit_rate;
  77     int version; /* 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) */
  78     int block_align;
  79     int use_bit_reservoir;
  80     int use_variable_block_len;
  81     int use_exp_vlc;  /* exponent coding: 0 = lsp, 1 = vlc + delta */
  82     int use_noise_coding; /* true if perceptual noise is added */
  83     int byte_offset_bits;
  84     VLC exp_vlc;
  85     int exponent_sizes[BLOCK_NB_SIZES];
  86     uint16_t exponent_bands[BLOCK_NB_SIZES][25];
  87     int high_band_start[BLOCK_NB_SIZES]; /* index of first coef in high band */
  88     int coefs_start;               /* first coded coef */
  89     int coefs_end[BLOCK_NB_SIZES]; /* max number of coded coefficients */
  90     int exponent_high_sizes[BLOCK_NB_SIZES];
  91     int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
  92     VLC hgain_vlc;
  93
  94     /* coded values in high bands */
  95     int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
  96     int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
  97
  98     /* there are two possible tables for spectral coefficients */
  99     VLC coef_vlc[2];
 100     uint16_t *run_table[2];
 101     uint16_t *level_table[2];
 102     /* frame info */
 103     int frame_len;       /* frame length in samples */
 104     int frame_len_bits;  /* frame_len = 1 << frame_len_bits */
 105
 106     /* block info */
 107     int reset_block_lengths;
 108     int block_len_bits; /* log2 of current block length */
 109     int next_block_len_bits; /* log2 of next block length */
 110     int prev_block_len_bits; /* log2 of prev block length */
 111     int block_len; /* block length in samples */
 112     int block_num; /* block number in current frame */
 113     int block_pos; /* current position in frame */
 114     uint8_t ms_stereo; /* true if mid/side stereo mode */
 115     uint8_t channel_coded[MAX_CHANNELS]; /* true if channel is coded */
 116     int exponents_bsize[MAX_CHANNELS];      // log2 ratio frame/exp. length
 117     fixed32 exponents[MAX_CHANNELS][BLOCK_MAX_SIZE];
 118     fixed32 max_exponent[MAX_CHANNELS];
 119     int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
 120     fixed32 (*coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
 121     MDCTContext mdct_ctx[BLOCK_NB_SIZES];
 122     fixed32 *windows[BLOCK_NB_SIZES];
 123     /* output buffer for one frame and the last for IMDCT windowing */
 124     fixed32 (*frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE*2];
 125
 126     /* last frame info */
 127     uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
 128     int last_bitoffset;
 129     int last_superframe_len;
 130     fixed32 *noise_table;
 131     int noise_index;
 132     fixed32 noise_mult; /* XXX: suppress that and integrate it in the noise array */
 133     /* lsp_to_curve tables */
 134     fixed32 lsp_cos_table[BLOCK_MAX_SIZE];
 135     fixed64 lsp_pow_e_table[256];
 136     fixed32 lsp_pow_m_table1[(1 << LSP_POW_BITS)];
 137     fixed32 lsp_pow_m_table2[(1 << LSP_POW_BITS)];
 138
 139     /* State of current superframe decoding */
 140     int bit_offset;
 141     int nb_frames;
 142     int current_frame;
 143
 144 #ifdef TRACE
 145
 146     int frame_count;
 147 #endif
 148 }
 149 WMADecodeContext;
 150
 151 int wma_decode_init(WMADecodeContext* s, asf_waveformatex_t *wfx);
 152 int wma_decode_superframe_init(WMADecodeContext* s,
 153                                uint8_t *buf, int buf_size);
 154 int wma_decode_superframe_frame(WMADecodeContext* s,
 155                                 int32_t *samples,
 156                                 uint8_t *buf, int buf_size);
 157 #endif