## ffmpeg / libavcodec / wma.h @ a9c9a240

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1 | 59686073 | Michael Niedermayer | ```
/*
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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 WMA_H
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23 | ```
#define WMA_H
``` |
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24 | |||

25 | #include "bitstream.h" |
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26 | #include "dsputil.h" |
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27 | |||

28 | ```
/* size of blocks */
``` |
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29 | #define BLOCK_MIN_BITS 7 |
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30 | #define BLOCK_MAX_BITS 11 |
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31 | #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS) |
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32 | |||

33 | #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1) |
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34 | |||

35 | ```
/* XXX: find exact max size */
``` |
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36 | #define HIGH_BAND_MAX_SIZE 16 |
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37 | |||

38 | #define NB_LSP_COEFS 10 |
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39 | |||

40 | ```
/* XXX: is it a suitable value ? */
``` |
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41 | #define MAX_CODED_SUPERFRAME_SIZE 16384 |
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42 | |||

43 | #define MAX_CHANNELS 2 |
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44 | |||

45 | #define NOISE_TAB_SIZE 8192 |
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46 | |||

47 | #define LSP_POW_BITS 7 |
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48 | |||

49 | ```
//FIXME should be in wmadec
``` |
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50 | #define VLCBITS 9 |
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51 | #define VLCMAX ((22+VLCBITS-1)/VLCBITS) |
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52 | |||

53 | typedef struct CoefVLCTable { |
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54 | 6836af52 | Michael Niedermayer | int n; ///< total number of codes |

55 | 59686073 | Michael Niedermayer | ```
int max_level;
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56 | 6836af52 | Michael Niedermayer | const uint32_t *huffcodes; ///< VLC bit values |

57 | const uint8_t *huffbits; ///< VLC bit size |
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58 | const uint16_t *levels; ///< table to build run/level tables |
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59 | 59686073 | Michael Niedermayer | } CoefVLCTable; |

60 | |||

61 | typedef struct WMADecodeContext { |
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62 | a9c9a240 | Michel Bardiaux | AVCodecContext* avctx; |

63 | 59686073 | Michael Niedermayer | GetBitContext gb; |

64 | PutBitContext pb; |
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65 | ```
int sample_rate;
``` |
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66 | ```
int nb_channels;
``` |
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67 | ```
int bit_rate;
``` |
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68 | 6836af52 | Michael Niedermayer | int version; ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) |

69 | 59686073 | Michael Niedermayer | ```
int block_align;
``` |

70 | ```
int use_bit_reservoir;
``` |
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71 | ```
int use_variable_block_len;
``` |
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72 | 6836af52 | Michael Niedermayer | int use_exp_vlc; ///< exponent coding: 0 = lsp, 1 = vlc + delta |

73 | int use_noise_coding; ///< true if perceptual noise is added |
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74 | 59686073 | Michael Niedermayer | ```
int byte_offset_bits;
``` |

75 | VLC exp_vlc; |
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76 | ```
int exponent_sizes[BLOCK_NB_SIZES];
``` |
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77 | ```
uint16_t exponent_bands[BLOCK_NB_SIZES][25];
``` |
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78 | 6836af52 | Michael Niedermayer | int high_band_start[BLOCK_NB_SIZES]; ///< index of first coef in high band |

79 | int coefs_start; ///< first coded coef |
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80 | int coefs_end[BLOCK_NB_SIZES]; ///< max number of coded coefficients |
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81 | 59686073 | Michael Niedermayer | ```
int exponent_high_sizes[BLOCK_NB_SIZES];
``` |

82 | ```
int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
``` |
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83 | VLC hgain_vlc; |
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84 | |||

85 | ```
/* coded values in high bands */
``` |
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86 | ```
int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
``` |
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87 | ```
int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
``` |
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88 | |||

89 | ```
/* there are two possible tables for spectral coefficients */
``` |
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90 | ```
//FIXME the following 3 tables should be shared between decoders
``` |
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91 | ```
VLC coef_vlc[2];
``` |
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92 | ```
uint16_t *run_table[2];
``` |
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93 | ```
uint16_t *level_table[2];
``` |
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94 | ```
uint16_t *int_table[2];
``` |
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95 | ```
CoefVLCTable *coef_vlcs[2];
``` |
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96 | ```
/* frame info */
``` |
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97 | 6836af52 | Michael Niedermayer | int frame_len; ///< frame length in samples |

98 | int frame_len_bits; ///< frame_len = 1 << frame_len_bits |
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99 | int nb_block_sizes; ///< number of block sizes |
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100 | 59686073 | Michael Niedermayer | ```
/* block info */
``` |

101 | ```
int reset_block_lengths;
``` |
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102 | 6836af52 | Michael Niedermayer | int block_len_bits; ///< log2 of current block length |

103 | int next_block_len_bits; ///< log2 of next block length |
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104 | int prev_block_len_bits; ///< log2 of prev block length |
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105 | int block_len; ///< block length in samples |
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106 | int block_num; ///< block number in current frame |
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107 | int block_pos; ///< current position in frame |
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108 | ```
uint8_t ms_stereo; ///< true if mid/side stereo mode
``` |
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109 | ```
uint8_t channel_coded[MAX_CHANNELS]; ///< true if channel is coded
``` |
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110 | 59686073 | Michael Niedermayer | ```
DECLARE_ALIGNED_16(float, exponents[MAX_CHANNELS][BLOCK_MAX_SIZE]);
``` |

111 | ```
float max_exponent[MAX_CHANNELS];
``` |
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112 | int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]; |
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113 | ```
DECLARE_ALIGNED_16(float, coefs[MAX_CHANNELS][BLOCK_MAX_SIZE]);
``` |
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114 | ```
DECLARE_ALIGNED_16(FFTSample, output[BLOCK_MAX_SIZE * 2]);
``` |
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115 | DECLARE_ALIGNED_16(float, window[BLOCK_MAX_SIZE * 2]); |
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116 | MDCTContext mdct_ctx[BLOCK_NB_SIZES]; |
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117 | ```
float *windows[BLOCK_NB_SIZES];
``` |
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118 | 6836af52 | Michael Niedermayer | ```
DECLARE_ALIGNED_16(FFTSample, mdct_tmp[BLOCK_MAX_SIZE]); ///< temporary storage for imdct
``` |

119 | 59686073 | Michael Niedermayer | ```
/* output buffer for one frame and the last for IMDCT windowing */
``` |

120 | DECLARE_ALIGNED_16(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 + 4]; /* 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 | DSPContext dsp; |
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134 | |||

135 | ```
#ifdef TRACE
``` |
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136 | ```
int frame_count;
``` |
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137 | ```
#endif
``` |
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138 | } WMADecodeContext; |
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139 | |||

140 | extern const uint16_t ff_wma_hgain_huffcodes[37]; |
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141 | extern const uint8_t ff_wma_hgain_huffbits[37]; |
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142 | extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16]; |
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143 | extern const uint32_t ff_wma_scale_huffcodes[121]; |
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144 | extern const uint8_t ff_wma_scale_huffbits[121]; |
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145 | |||

146 | int ff_wma_init(AVCodecContext * avctx, int flags2); |
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147 | int ff_wma_total_gain_to_bits(int total_gain); |
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148 | ```
int ff_wma_end(AVCodecContext *avctx);
``` |
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149 | |||

150 | `#endif` |