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 <libasf/asf.h> 24 #include "ffmpeg_get_bits.h" 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 55 #if (CONFIG_CPU == PP5022) || (CONFIG_CPU == PP5024) || (CONFIG_CPU == MCF5250) 56 /* PP5022/24 and MCF5250 have 128KB of IRAM. 80KB are allocated for codecs */ 57 #define IBSS_ATTR_WMA_LARGE_IRAM IBSS_ATTR 58 #define IBSS_ATTR_WMA_XL_IRAM 59 #define ICONST_ATTR_WMA_XL_IRAM 60 61 #elif defined(CPU_S5L870X) 62 /* S5L870x has even more IRAM. Use it. */ 63 #define IBSS_ATTR_WMA_LARGE_IRAM IBSS_ATTR 64 #define IBSS_ATTR_WMA_XL_IRAM IBSS_ATTR 65 #define ICONST_ATTR_WMA_XL_IRAM ICONST_ATTR 66 67 #else 68 /* other PP's and MCF5249 have 96KB of IRAM */ 69 #define IBSS_ATTR_WMA_LARGE_IRAM 70 #define IBSS_ATTR_WMA_XL_IRAM 71 #define ICONST_ATTR_WMA_XL_IRAM 72 73 #endif 74 75 76 #define VLCBITS 7 /*7 is the lowest without glitching*/ 77 #define VLCMAX ((22+VLCBITS-1)/VLCBITS) 78 79 #define EXPVLCBITS 7 80 #define EXPMAX ((19+EXPVLCBITS-1)/EXPVLCBITS) 81 82 #define HGAINVLCBITS 9 83 #define HGAINMAX ((13+HGAINVLCBITS-1)/HGAINVLCBITS) 84 85 86 typedef struct CoefVLCTable 87 { 88 int n; /* total number of codes */ 89 const uint32_t *huffcodes; /* VLC bit values */ 90 const uint8_t *huffbits; /* VLC bit size */ 91 const uint16_t *levels; /* table to build run/level tables */ 92 } 93 CoefVLCTable; 94 95 /* Define MEM_ALIGN_ATTR which may be used to align e.g. buffers for faster 96 * access. */ 97 #if defined(CPU_ARM) 98 /* Use ARMs cache alignment. */ 99 #define MEM_ALIGN_ATTR CACHEALIGN_ATTR 100 #define MEM_ALIGN_SIZE CACHEALIGN_SIZE 101 #elif defined(CPU_COLDFIRE) 102 /* Use fixed alignment of 16 bytes. Speed up only for 'movem' in DRAM. */ 103 #define MEM_ALIGN_ATTR __attribute__((aligned(16))) 104 #define MEM_ALIGN_SIZE 16 105 #else 106 /* Align pointer size */ 107 #define MEM_ALIGN_ATTR __attribute__((aligned(sizeof(intptr_t)))) 108 #define MEM_ALIGN_SIZE sizeof(intptr_t) 109 #endif 110 111 typedef struct WMADecodeContext 112 { 113 GetBitContext gb; 114 115 int nb_block_sizes; /* number of block sizes */ 116 117 int sample_rate; 118 int nb_channels; 119 int bit_rate; 120 int version; /* 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) */ 121 int block_align; 122 int use_bit_reservoir; 123 int use_variable_block_len; 124 int use_exp_vlc; /* exponent coding: 0 = lsp, 1 = vlc + delta */ 125 int use_noise_coding; /* true if perceptual noise is added */ 126 int byte_offset_bits; 127 VLC exp_vlc; 128 int exponent_sizes[BLOCK_NB_SIZES]; 129 uint16_t exponent_bands[BLOCK_NB_SIZES][25]; 130 int high_band_start[BLOCK_NB_SIZES]; /* index of first coef in high band */ 131 int coefs_start; /* first coded coef */ 132 int coefs_end[BLOCK_NB_SIZES]; /* max number of coded coefficients */ 133 int exponent_high_sizes[BLOCK_NB_SIZES]; 134 int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE]; 135 VLC hgain_vlc; 136 137 /* coded values in high bands */ 138 int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]; 139 int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]; 140 141 /* there are two possible tables for spectral coefficients */ 142 VLC coef_vlc[2]; 143 uint16_t *run_table[2]; 144 uint16_t *level_table[2]; 145 /* frame info */ 146 int frame_len; /* frame length in samples */ 147 int frame_len_bits; /* frame_len = 1 << frame_len_bits */ 148 149 /* block info */ 150 int reset_block_lengths; 151 int block_len_bits; /* log2 of current block length */ 152 int next_block_len_bits; /* log2 of next block length */ 153 int prev_block_len_bits; /* log2 of prev block length */ 154 int block_len; /* block length in samples */ 155 int block_num; /* block number in current frame */ 156 int block_pos; /* current position in frame */ 157 uint8_t ms_stereo; /* true if mid/side stereo mode */ 158 uint8_t channel_coded[MAX_CHANNELS]; /* true if channel is coded */ 159 int exponents_bsize[MAX_CHANNELS]; // log2 ratio frame/exp. length 160 fixed32 exponents[MAX_CHANNELS][BLOCK_MAX_SIZE] MEM_ALIGN_ATTR; 161 fixed32 max_exponent[MAX_CHANNELS]; 162 int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]; 163 fixed32 coefs[MAX_CHANNELS][BLOCK_MAX_SIZE]; 164 fixed32 *windows[BLOCK_NB_SIZES]; 165 /* output buffer for one frame and the last for IMDCT windowing */ 166 fixed32 frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE*2]; 167 168 /* last frame info */ 169 uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4] MEM_ALIGN_ATTR; /* padding added */ 170 int last_bitoffset; 171 int last_superframe_len; 172 fixed32 *noise_table; 173 int noise_index; 174 fixed32 noise_mult; /* XXX: suppress that and integrate it in the noise array */ 175 /* lsp_to_curve tables */ 176 fixed32 lsp_cos_table[BLOCK_MAX_SIZE] MEM_ALIGN_ATTR; 177 void *lsp_pow_m_table1; 178 void *lsp_pow_m_table2; 179 180 /* State of current superframe decoding */ 181 int bit_offset; 182 int nb_frames; 183 int current_frame; 184 185 #ifdef TRACE 186 187 int frame_count; 188 #endif 189 } 190 WMADecodeContext; 191 192 int wma_decode_init(WMADecodeContext* s, asf_waveformatex_t *wfx); 193 int wma_decode_superframe_init(WMADecodeContext* s, 194 const uint8_t *buf, int buf_size); 195 int wma_decode_superframe_frame(WMADecodeContext* s, 196 const uint8_t *buf, int buf_size); 197 #endif 198