1 | using System; |
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2 | using System.IO; |
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3 | |
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4 | namespace Oni.Sound |
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5 | { |
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6 | internal class WavExporter : SoundExporter |
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7 | { |
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8 | #region Private data |
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9 | private bool convert_to_PCM; |
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10 | private bool do_pc_demo_test; |
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11 | |
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12 | private const int fcc_RIFF = 0x46464952; |
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13 | private const int fcc_WAVE = 0x45564157; |
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14 | private const int fcc_fmt = 0x20746d66; |
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15 | private const int fcc_fact = 0x74636166; |
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16 | private const int fcc_data = 0x61746164; |
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17 | |
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18 | private static readonly byte[] formatTemplate_ADPCM = new byte[50] |
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19 | { |
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20 | 0x02, 0, // format ID (2 for ADPCM) |
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21 | 0, 0, // ChannelCount (overwritten) |
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22 | 0x22, 0x56, 0, 0, // SampleRate (usually 22050, can be 44100) |
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23 | 0, 0, 0, 0, // average data rate (computed and overwritten) |
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24 | 0, 0x02, // block alignment (default 512, can be 1024) |
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25 | 0x04, 0, // bits per sample (always 4) |
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26 | 0x20, 0, // size of extended ADPCM header block |
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27 | 0xf4, 0x03, // samples per block (usually 1012, can be 2036) |
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28 | 0x07, 0, // standard ADPCM coefficient table (always the same) |
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29 | 0, 0x01, 0, 0, |
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30 | 0, 0x02, 0, 0xff, |
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31 | 0, 0, 0, 0, |
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32 | 0xc0, 0, 0x40, 0, |
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33 | 0xf0, 0, 0, 0, |
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34 | 0xcc, 0x01, 0x30, 0xff, |
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35 | 0x88, 0x01, 0x18, 0xff |
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36 | }; |
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37 | |
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38 | private static readonly byte[] formatTemplate_PCM = new byte[16] |
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39 | { |
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40 | 0x01, 0, // format ID (1 for linear PCM) |
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41 | 0, 0, // ChannelCount (overwritten) |
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42 | 0x22, 0x56, 0, 0, // SampleRate (usually 22050, can be 44100) |
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43 | 0, 0, 0, 0, // data rate in bytes/s (computed and overwritten) |
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44 | 0x02, 0, // block size (2 bytes for mono, 4 for stereo) |
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45 | 0x10, 0 // bits per sample (always 16) |
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46 | }; |
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47 | |
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48 | private static readonly byte[] factTemplate = new byte[4] |
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49 | { |
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50 | 0, 0, 0, 0 // sample count (computed and overwritten) |
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51 | }; |
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52 | |
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53 | private static readonly int[] ima_index_table = new int[16] |
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54 | { |
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55 | -1, -1, -1, -1, 2, 4, 6, 8, |
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56 | -1, -1, -1, -1, 2, 4, 6, 8 |
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57 | }; |
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58 | |
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59 | private static readonly int[] ima_step_table = new int[89] |
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60 | { |
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61 | 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, |
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62 | 19, 21, 23, 25, 28, 31, 34, 37, 41, 45, |
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63 | 50, 55, 60, 66, 73, 80, 88, 97, 107, 118, |
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64 | 130, 143, 157, 173, 190, 209, 230, 253, 279, 307, |
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65 | 337, 371, 408, 449, 494, 544, 598, 658, 724, 796, |
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66 | 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066, |
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67 | 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358, |
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68 | 5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899, |
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69 | 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767 |
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70 | }; |
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71 | |
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72 | private static readonly int[] msadpcm_adapt_table = new int[16] |
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73 | { |
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74 | 230, 230, 230, 230, 307, 409, 512, 614, |
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75 | 768, 614, 512, 409, 307, 230, 230, 230 |
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76 | }; |
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77 | |
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78 | private static readonly int[] msadpcm_coeff_table1 = new int[7] |
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79 | { |
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80 | 256, 512, 0, 192, 240, 460, 392 |
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81 | }; |
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82 | |
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83 | private static readonly int[] msadpcm_coeff_table2 = new int[7] |
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84 | { |
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85 | 0, -256, 0, 64, 0, -208, -232 |
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86 | }; |
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87 | #endregion |
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88 | |
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89 | public WavExporter(InstanceFileManager fileManager, string outputDirPath, bool convertToPCM = false, bool noDemo = false) |
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90 | : base(fileManager, outputDirPath) |
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91 | { |
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92 | convert_to_PCM = convertToPCM; |
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93 | do_pc_demo_test = !noDemo; |
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94 | } |
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95 | |
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96 | private static void ClampToRange(ref int value, int lower, int upper) |
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97 | { |
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98 | if (value > upper) |
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99 | value = upper; |
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100 | if (value < lower) |
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101 | value = lower; |
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102 | } |
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103 | |
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104 | protected Int16 NibbletoSampleIMA4(ref int predictor, ref int step_index, Byte nibble) |
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105 | { |
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106 | int step = ima_step_table[step_index]; |
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107 | |
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108 | step_index += ima_index_table[nibble]; |
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109 | ClampToRange(ref step_index, 0, 88); |
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110 | |
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111 | int diff = step >> 3; |
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112 | |
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113 | if ((nibble & 0x04) != 0) diff += step; |
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114 | if ((nibble & 0x02) != 0) diff += (step >> 1); |
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115 | if ((nibble & 0x01) != 0) diff += (step >> 2); |
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116 | if ((nibble & 0x08) != 0) |
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117 | predictor -= diff; |
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118 | else |
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119 | predictor += diff; |
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120 | |
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121 | ClampToRange(ref predictor, -32768, 32767); |
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122 | return (Int16)predictor; |
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123 | } |
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124 | |
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125 | protected Int16 NibbletoSampleMSADPCM(ref Int16 sample1, ref Int16 sample2, ref UInt16 delta, Byte pred_index, Byte nibble) |
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126 | { |
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127 | int coeff1 = msadpcm_coeff_table1[pred_index]; |
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128 | int coeff2 = msadpcm_coeff_table2[pred_index]; |
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129 | |
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130 | int prediction = ((int)sample1 * (int)coeff1 + (int)sample2 * (int)coeff2) >> 8; |
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131 | |
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132 | int snibble = (nibble < 8) ? nibble : (nibble - 16); |
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133 | int correction = snibble * (int)delta; |
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134 | |
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135 | int sample = prediction + correction; |
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136 | ClampToRange(ref sample, -32768, 32767); |
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137 | |
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138 | sample2 = sample1; |
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139 | sample1 = (Int16)sample; |
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140 | |
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141 | int newDelta = delta * msadpcm_adapt_table[nibble]; |
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142 | newDelta >>= 8; |
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143 | ClampToRange(ref newDelta, 16, 65535); |
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144 | delta = (UInt16)newDelta; |
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145 | |
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146 | return (Int16)sample; |
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147 | } |
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148 | |
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149 | protected override void ExportInstance(InstanceDescriptor descriptor) |
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150 | { |
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151 | var sound = SoundData.Read(descriptor, do_pc_demo_test); |
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152 | |
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153 | using (var stream = File.Create(Path.Combine(OutputDirPath, descriptor.FullName + ".wav"))) |
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154 | using (var writer = new BinaryWriter(stream)) |
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155 | { |
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156 | int blockSizeADPCM, samplesPerBlock, sampleCount, paddingBytes = 0; |
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157 | if (sound.IsIMA4) // IMA4 ADPCM format |
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158 | { |
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159 | blockSizeADPCM = 34 * sound.ChannelCount; |
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160 | samplesPerBlock = 64; |
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161 | sampleCount = (sound.Data.Length / blockSizeADPCM) * samplesPerBlock; |
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162 | } |
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163 | else |
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164 | { |
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165 | blockSizeADPCM = sound.BlockAlignment; |
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166 | int wholeBlocks = sound.Data.Length / blockSizeADPCM; |
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167 | int leftoverBytes = sound.Data.Length - (wholeBlocks * blockSizeADPCM); |
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168 | int leftoverSamples = 0; |
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169 | if (leftoverBytes > 7 * sound.ChannelCount) |
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170 | leftoverSamples = 2 + (leftoverBytes - 7 * sound.ChannelCount) |
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171 | * 8 / sound.BitsPerSample / sound.ChannelCount; |
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172 | else |
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173 | Console.Error.WriteLine("Improper trailing bytes/samples!"); |
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174 | if (leftoverBytes > 0) // incomplete trailing block |
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175 | paddingBytes = blockSizeADPCM - leftoverBytes; |
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176 | samplesPerBlock = 2 + (blockSizeADPCM - sound.ChannelCount * 7) * 8 / sound.ChannelCount / sound.BitsPerSample; |
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177 | sampleCount = wholeBlocks * samplesPerBlock + leftoverSamples; |
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178 | } |
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179 | if (!convert_to_PCM) |
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180 | { |
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181 | if (sound.IsIMA4) |
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182 | { |
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183 | throw new NotSupportedException("Transcoding from IMA4 ADPCM (Mac) to MS ADPCM (PC) not supported! Please use -extract:pcm"); |
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184 | } |
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185 | var format = (byte[])formatTemplate_ADPCM.Clone(); |
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186 | var fact = (byte[])factTemplate.Clone(); // needed for ADPCM (to specify the actual sample count) |
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187 | |
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188 | var averageRate = sound.SampleRate * blockSizeADPCM / samplesPerBlock; |
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189 | Array.Copy(BitConverter.GetBytes(sound.ChannelCount), 0, format, 2, 2); |
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190 | Array.Copy(BitConverter.GetBytes(sound.SampleRate), 0, format, 4, 4); |
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191 | Array.Copy(BitConverter.GetBytes(averageRate), 0, format, 8, 4); |
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192 | Array.Copy(BitConverter.GetBytes(blockSizeADPCM), 0, format, 12, 2); |
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193 | Array.Copy(BitConverter.GetBytes(samplesPerBlock), 0, format, 18, 2); |
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194 | |
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195 | Array.Copy(BitConverter.GetBytes(sampleCount), 0, fact, 0, 4); |
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196 | |
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197 | writer.Write(fcc_RIFF); |
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198 | writer.Write(8 + format.Length + 8 + fact.Length + 8 + sound.Data.Length + paddingBytes); |
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199 | writer.Write(fcc_WAVE); |
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200 | |
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201 | // |
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202 | // write format chunk |
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203 | // |
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204 | writer.Write(fcc_fmt); |
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205 | writer.Write(format.Length); |
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206 | writer.Write(format); |
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207 | |
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208 | // |
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209 | // write fact chunk |
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210 | // |
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211 | writer.Write(fcc_fact); |
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212 | writer.Write(fact.Length); |
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213 | writer.Write(fact); |
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214 | |
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215 | // |
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216 | // write data chunk |
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217 | // |
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218 | writer.Write(fcc_data); |
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219 | writer.Write(sound.Data.Length + paddingBytes); |
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220 | writer.Write(sound.Data); |
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221 | |
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222 | Byte c = 0; |
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223 | for (int i = 0; i < paddingBytes; i++) |
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224 | writer.Write(c); |
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225 | } |
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226 | else |
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227 | { |
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228 | var format = (byte[])formatTemplate_PCM.Clone(); |
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229 | |
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230 | var blockSizePCM = 2 * sound.ChannelCount; // 16-bit samples or sample pairs |
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231 | samplesPerBlock = 2; |
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232 | var averageRate = sound.SampleRate * blockSizePCM / samplesPerBlock; |
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233 | Array.Copy(BitConverter.GetBytes(sound.ChannelCount), 0, format, 2, 2); |
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234 | Array.Copy(BitConverter.GetBytes(sound.SampleRate), 0, format, 4, 4); |
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235 | Array.Copy(BitConverter.GetBytes(averageRate), 0, format, 8, 4); |
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236 | Array.Copy(BitConverter.GetBytes(blockSizePCM), 0, format, 12, 2); |
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237 | |
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238 | int dataSize = blockSizePCM * sampleCount; |
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239 | |
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240 | writer.Write(fcc_RIFF); |
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241 | writer.Write(8 + format.Length + 8 + dataSize); |
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242 | writer.Write(fcc_WAVE); |
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243 | |
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244 | // |
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245 | // write format chunk |
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246 | // |
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247 | |
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248 | writer.Write(fcc_fmt); |
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249 | writer.Write(format.Length); |
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250 | writer.Write(format); |
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251 | |
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252 | // |
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253 | // write data chunk |
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254 | // |
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255 | var samplesL = new Int16[sampleCount]; |
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256 | var samplesR = new Int16[sampleCount]; |
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257 | if (sound.IsIMA4) // decode IMA4 into linear signed 16-bit PCM |
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258 | { |
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259 | int pos = 0; |
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260 | |
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261 | int iSampleL = 0; |
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262 | int predictorL = 0; |
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263 | int stepIndexL = 0; |
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264 | int iSampleR = 0; |
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265 | int predictorR = 0; |
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266 | int stepIndexR = 0; |
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267 | |
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268 | int nBlocks = sound.Data.Length / blockSizeADPCM; |
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269 | for (int block = 0; block < nBlocks; block++) |
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270 | { |
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271 | byte headerHiL = sound.Data[pos++]; |
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272 | byte headerLoL = sound.Data[pos++]; |
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273 | if (block == 0) // non-standard decoding: predictor initialization ignored after start |
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274 | { |
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275 | predictorL = ((((headerHiL << 1) | (headerLoL >> 7))) << 7); |
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276 | if (predictorL > 32767) predictorL -= 65536; |
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277 | } |
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278 | stepIndexL = headerLoL & 0x7f; |
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279 | if (stepIndexL > 88) |
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280 | Console.WriteLine("Block {0} (L): Initial IMA4 step index is {1}, clamping to 88.", block, stepIndexL); |
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281 | ClampToRange(ref stepIndexL, 0, 88); |
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282 | |
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283 | for (int b = 0; b < 32; b++) |
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284 | { |
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285 | Byte nibblesL = sound.Data[pos++]; |
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286 | Byte nibbleHiL = (Byte)(nibblesL >> 4); |
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287 | Byte nibbleLoL = (Byte)(nibblesL & 0xF); |
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288 | |
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289 | samplesL[iSampleL++] = NibbletoSampleIMA4(ref predictorL, ref stepIndexL, nibbleLoL); |
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290 | samplesL[iSampleL++] = NibbletoSampleIMA4(ref predictorL, ref stepIndexL, nibbleHiL); |
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291 | } |
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292 | |
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293 | if (sound.ChannelCount == 2) |
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294 | { |
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295 | byte headerHiR = sound.Data[pos++]; |
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296 | byte headerLoR = sound.Data[pos++]; |
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297 | if (block == 0) // non-standard decoding: predictor initialization ignored after start |
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298 | { |
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299 | predictorR = ((((headerHiR << 1) | (headerLoR >> 7))) << 7); |
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300 | if (predictorR > 32767) predictorR -= 65536; |
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301 | } |
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302 | stepIndexR = headerLoR & 0x7f; |
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303 | if (stepIndexR > 88) |
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304 | Console.WriteLine("Block {0} (R): Initial IMA4 step index is {1}, clamping to 88.", block, stepIndexR); |
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305 | ClampToRange(ref stepIndexR, 0, 88); |
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306 | |
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307 | for (int b = 0; b < 32; b++) |
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308 | { |
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309 | Byte nibblesR = sound.Data[pos++]; |
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310 | Byte nibbleHiR = (Byte)(nibblesR >> 4); |
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311 | Byte nibbleLoR = (Byte)(nibblesR & 0xF); |
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312 | |
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313 | samplesR[iSampleR++] = NibbletoSampleIMA4(ref predictorR, ref stepIndexR, nibbleLoR); |
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314 | samplesR[iSampleR++] = NibbletoSampleIMA4(ref predictorR, ref stepIndexR, nibbleHiR); |
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315 | } |
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316 | } |
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317 | } |
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318 | } |
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319 | else // decode MSADPCM into linear signed 16-bit PCM |
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320 | { |
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321 | int pos = 0; |
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322 | Byte pred_indexL = 0, pred_indexR = 0; |
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323 | UInt16 deltaL = 0, deltaR = 0; |
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324 | int iSampleL = 0; |
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325 | int iSampleR = 0; |
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326 | Int16 sample1L = 0, sample2L = 0; |
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327 | Int16 sample1R = 0, sample2R = 0; |
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328 | |
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329 | while (pos < sound.Data.Length) |
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330 | { |
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331 | if ((pos % blockSizeADPCM) == 0) // read block header |
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332 | { |
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333 | pred_indexL = sound.Data[pos++]; |
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334 | if (sound.ChannelCount == 2) |
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335 | pred_indexR = sound.Data[pos++]; |
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336 | Byte deltaLo = sound.Data[pos++]; |
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337 | Byte deltaHi = sound.Data[pos++]; |
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338 | deltaL = (UInt16)(deltaLo + 256 * deltaHi); |
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339 | if (sound.ChannelCount == 2) |
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340 | { |
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341 | deltaLo = sound.Data[pos++]; |
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342 | deltaHi = sound.Data[pos++]; |
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343 | deltaR = (UInt16)(deltaLo + 256 * deltaHi); |
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344 | } |
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345 | Byte sampleLo = sound.Data[pos++]; |
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346 | Byte sampleHi = sound.Data[pos++]; |
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347 | UInt16 usample = (UInt16)(sampleLo + 256 * sampleHi); |
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348 | sample1L = (Int16)((usample < 32767) ? usample : (usample - 65536)); |
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349 | if (sound.ChannelCount == 2) |
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350 | { |
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351 | sampleLo = sound.Data[pos++]; |
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352 | sampleHi = sound.Data[pos++]; |
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353 | usample = (UInt16)(sampleLo + 256 * sampleHi); |
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354 | sample1R = (Int16)((usample < 32767) ? usample : (usample - 65536)); |
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355 | } |
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356 | sampleLo = sound.Data[pos++]; |
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357 | sampleHi = sound.Data[pos++]; |
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358 | usample = (UInt16)(sampleLo + 256 * sampleHi); |
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359 | sample2L = (Int16)((usample < 32767) ? usample : (usample - 65536)); |
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360 | if (sound.ChannelCount == 2) |
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361 | { |
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362 | sampleLo = sound.Data[pos++]; |
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363 | sampleHi = sound.Data[pos++]; |
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364 | usample = (UInt16)(sampleLo + 256 * sampleHi); |
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365 | sample2R = (Int16)((usample < 32767) ? usample : (usample - 65536)); |
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366 | } |
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367 | samplesL[iSampleL++] = sample2L; |
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368 | samplesL[iSampleL++] = sample1L; |
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369 | if (sound.ChannelCount == 2) |
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370 | { |
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371 | samplesR[iSampleR++] = sample2R; |
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372 | samplesR[iSampleR++] = sample1R; |
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373 | } |
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374 | } |
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375 | else // read pair of nibbles |
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376 | { |
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377 | Byte nibbles = sound.Data[pos++]; |
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378 | Byte nibbleHi = (Byte)(nibbles >> 4); |
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379 | Byte nibbleLo = (Byte)(nibbles & 0xF); |
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380 | samplesL[iSampleL++] = NibbletoSampleMSADPCM(ref sample1L, ref sample2L, ref deltaL, pred_indexL, nibbleHi); |
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381 | if (sound.ChannelCount == 2) |
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382 | samplesR[iSampleR++] = NibbletoSampleMSADPCM(ref sample1R, ref sample2R, ref deltaR, pred_indexR, nibbleLo); |
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383 | else |
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384 | samplesL[iSampleL++] = NibbletoSampleMSADPCM(ref sample1L, ref sample2L, ref deltaL, pred_indexL, nibbleLo); |
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385 | } |
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386 | } |
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387 | } |
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388 | writer.Write(fcc_data); |
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389 | writer.Write(dataSize); |
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390 | for (int smp = 0; smp < sampleCount; smp++) |
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391 | { |
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392 | writer.Write(samplesL[smp]); |
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393 | if(sound.ChannelCount == 2) |
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394 | writer.Write(samplesR[smp]); |
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395 | } |
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396 | } |
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397 | } |
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398 | } |
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399 | } |
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400 | } |
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