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4349 | Serge | 1 | /* |
2 | * WMA compatible codec |
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3 | * Copyright (c) 2002-2007 The FFmpeg Project |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | #ifndef AVCODEC_WMA_H |
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23 | #define AVCODEC_WMA_H |
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24 | |||
25 | #include "libavutil/float_dsp.h" |
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26 | #include "get_bits.h" |
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27 | #include "put_bits.h" |
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28 | #include "fft.h" |
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29 | #include "fmtconvert.h" |
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30 | |||
31 | /* size of blocks */ |
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32 | #define BLOCK_MIN_BITS 7 |
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33 | #define BLOCK_MAX_BITS 11 |
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34 | #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS) |
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35 | |||
36 | #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1) |
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37 | |||
38 | /* XXX: find exact max size */ |
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39 | #define HIGH_BAND_MAX_SIZE 16 |
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40 | |||
41 | #define NB_LSP_COEFS 10 |
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42 | |||
43 | /* XXX: is it a suitable value ? */ |
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44 | #define MAX_CODED_SUPERFRAME_SIZE 16384 |
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45 | |||
46 | #define MAX_CHANNELS 2 |
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47 | |||
48 | #define NOISE_TAB_SIZE 8192 |
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49 | |||
50 | #define LSP_POW_BITS 7 |
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51 | |||
52 | //FIXME should be in wmadec |
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53 | #define VLCBITS 9 |
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54 | #define VLCMAX ((22+VLCBITS-1)/VLCBITS) |
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55 | |||
56 | typedef float WMACoef; ///< type for decoded coefficients, int16_t would be enough for wma 1/2 |
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57 | |||
58 | typedef struct CoefVLCTable { |
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59 | int n; ///< total number of codes |
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60 | int max_level; |
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61 | const uint32_t *huffcodes; ///< VLC bit values |
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62 | const uint8_t *huffbits; ///< VLC bit size |
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63 | const uint16_t *levels; ///< table to build run/level tables |
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64 | } CoefVLCTable; |
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65 | |||
66 | typedef struct WMACodecContext { |
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67 | AVCodecContext* avctx; |
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68 | GetBitContext gb; |
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69 | PutBitContext pb; |
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70 | int version; ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) |
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71 | int use_bit_reservoir; |
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72 | int use_variable_block_len; |
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73 | int use_exp_vlc; ///< exponent coding: 0 = lsp, 1 = vlc + delta |
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74 | int use_noise_coding; ///< true if perceptual noise is added |
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75 | int byte_offset_bits; |
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76 | VLC exp_vlc; |
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77 | int exponent_sizes[BLOCK_NB_SIZES]; |
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78 | uint16_t exponent_bands[BLOCK_NB_SIZES][25]; |
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79 | int high_band_start[BLOCK_NB_SIZES]; ///< index of first coef in high band |
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80 | int coefs_start; ///< first coded coef |
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81 | int coefs_end[BLOCK_NB_SIZES]; ///< max number of coded coefficients |
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82 | int exponent_high_sizes[BLOCK_NB_SIZES]; |
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83 | int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE]; |
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84 | VLC hgain_vlc; |
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85 | |||
86 | /* coded values in high bands */ |
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87 | int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]; |
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88 | int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]; |
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89 | |||
90 | /* there are two possible tables for spectral coefficients */ |
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91 | //FIXME the following 3 tables should be shared between decoders |
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92 | VLC coef_vlc[2]; |
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93 | uint16_t *run_table[2]; |
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94 | float *level_table[2]; |
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95 | uint16_t *int_table[2]; |
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96 | const CoefVLCTable *coef_vlcs[2]; |
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97 | /* frame info */ |
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98 | int frame_len; ///< frame length in samples |
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99 | int frame_len_bits; ///< frame_len = 1 << frame_len_bits |
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100 | int nb_block_sizes; ///< number of block sizes |
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101 | /* block info */ |
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102 | int reset_block_lengths; |
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103 | int block_len_bits; ///< log2 of current block length |
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104 | int next_block_len_bits; ///< log2 of next block length |
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105 | int prev_block_len_bits; ///< log2 of prev block length |
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106 | int block_len; ///< block length in samples |
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107 | int block_num; ///< block number in current frame |
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108 | int block_pos; ///< current position in frame |
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109 | uint8_t ms_stereo; ///< true if mid/side stereo mode |
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110 | uint8_t channel_coded[MAX_CHANNELS]; ///< true if channel is coded |
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111 | int exponents_bsize[MAX_CHANNELS]; ///< log2 ratio frame/exp. length |
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112 | DECLARE_ALIGNED(32, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE]; |
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113 | float max_exponent[MAX_CHANNELS]; |
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114 | WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]; |
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115 | DECLARE_ALIGNED(32, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE]; |
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116 | DECLARE_ALIGNED(32, FFTSample, output)[BLOCK_MAX_SIZE * 2]; |
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117 | FFTContext mdct_ctx[BLOCK_NB_SIZES]; |
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118 | float *windows[BLOCK_NB_SIZES]; |
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119 | /* output buffer for one frame and the last for IMDCT windowing */ |
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120 | DECLARE_ALIGNED(32, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2]; |
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121 | /* last frame info */ |
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122 | uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + FF_INPUT_BUFFER_PADDING_SIZE]; /* padding added */ |
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123 | int last_bitoffset; |
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124 | int last_superframe_len; |
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125 | float noise_table[NOISE_TAB_SIZE]; |
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126 | int noise_index; |
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127 | float noise_mult; /* XXX: suppress that and integrate it in the noise array */ |
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128 | /* lsp_to_curve tables */ |
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129 | float lsp_cos_table[BLOCK_MAX_SIZE]; |
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130 | float lsp_pow_e_table[256]; |
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131 | float lsp_pow_m_table1[(1 << LSP_POW_BITS)]; |
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132 | float lsp_pow_m_table2[(1 << LSP_POW_BITS)]; |
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133 | FmtConvertContext fmt_conv; |
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134 | AVFloatDSPContext fdsp; |
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135 | |||
136 | #ifdef TRACE |
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137 | int frame_count; |
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138 | #endif |
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139 | } WMACodecContext; |
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140 | |||
141 | extern const uint16_t ff_wma_critical_freqs[25]; |
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142 | extern const uint16_t ff_wma_hgain_huffcodes[37]; |
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143 | extern const uint8_t ff_wma_hgain_huffbits[37]; |
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144 | extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16]; |
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145 | extern const uint32_t ff_aac_scalefactor_code[121]; |
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146 | extern const uint8_t ff_aac_scalefactor_bits[121]; |
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147 | |||
148 | int ff_wma_init(AVCodecContext * avctx, int flags2); |
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149 | int ff_wma_total_gain_to_bits(int total_gain); |
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150 | int ff_wma_end(AVCodecContext *avctx); |
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151 | unsigned int ff_wma_get_large_val(GetBitContext* gb); |
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152 | int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb, |
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153 | VLC *vlc, |
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154 | const float *level_table, const uint16_t *run_table, |
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155 | int version, WMACoef *ptr, int offset, |
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156 | int num_coefs, int block_len, int frame_len_bits, |
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157 | int coef_nb_bits); |
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158 | |||
159 | #endif /* AVCODEC_WMA_H */><>><>>>>>>>>>>>><>>>>>>>>>>>>>>><> |