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using System; |
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using System.IO; |
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|
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namespace Oni.Sound |
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{ |
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internal class WavExporter : SoundExporter |
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{ |
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#region Private data |
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private bool convert_to_PCM; |
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private bool do_pc_demo_test; |
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|
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private const int fcc_RIFF = 0x46464952; |
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private const int fcc_WAVE = 0x45564157; |
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private const int fcc_fmt = 0x20746d66; |
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private const int fcc_fact = 0x74636166; |
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private const int fcc_data = 0x61746164; |
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|
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private static readonly byte[] formatTemplate_ADPCM = new byte[50] |
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{ |
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0x02, 0, // format ID (2 for ADPCM) |
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0, 0, // ChannelCount (overwritten) |
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0x22, 0x56, 0, 0, // SampleRate (usually 22050, can be 44100) |
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0, 0, 0, 0, // average data rate (computed and overwritten) |
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0, 0x02, // block alignment (default 512, can be 1024) |
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0x04, 0, // bits per sample (always 4) |
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0x20, 0, // size of extended ADPCM header block |
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0xf4, 0x03, // samples per block (usually 1012, can be 2036) |
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0x07, 0, // standard ADPCM coefficient table (always the same) |
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0, 0x01, 0, 0, |
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0, 0x02, 0, 0xff, |
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0, 0, 0, 0, |
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0xc0, 0, 0x40, 0, |
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0xf0, 0, 0, 0, |
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0xcc, 0x01, 0x30, 0xff, |
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0x88, 0x01, 0x18, 0xff |
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}; |
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|
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private static readonly byte[] formatTemplate_PCM = new byte[16] |
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{ |
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0x01, 0, // format ID (1 for linear PCM) |
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0, 0, // ChannelCount (overwritten) |
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0x22, 0x56, 0, 0, // SampleRate (usually 22050, can be 44100) |
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0, 0, 0, 0, // data rate in bytes/s (computed and overwritten) |
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0x02, 0, // block size (2 bytes for mono, 4 for stereo) |
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0x10, 0 // bits per sample (always 16) |
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}; |
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|
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private static readonly byte[] factTemplate = new byte[4] |
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{ |
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0, 0, 0, 0 // sample count (computed and overwritten) |
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}; |
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|
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private static readonly int[] ima_index_table = new int[16] |
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{ |
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-1, -1, -1, -1, 2, 4, 6, 8, |
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-1, -1, -1, -1, 2, 4, 6, 8 |
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}; |
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|
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private static readonly int[] ima_step_table = new int[89] |
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{ |
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7, 8, 9, 10, 11, 12, 13, 14, 16, 17, |
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19, 21, 23, 25, 28, 31, 34, 37, 41, 45, |
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50, 55, 60, 66, 73, 80, 88, 97, 107, 118, |
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130, 143, 157, 173, 190, 209, 230, 253, 279, 307, |
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337, 371, 408, 449, 494, 544, 598, 658, 724, 796, |
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876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066, |
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2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358, |
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5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899, |
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15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767 |
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}; |
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|
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private static readonly int[] msadpcm_adapt_table = new int[16] |
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{ |
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230, 230, 230, 230, 307, 409, 512, 614, |
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768, 614, 512, 409, 307, 230, 230, 230 |
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}; |
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|
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private static readonly int[] msadpcm_coeff_table1 = new int[7] |
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{ |
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256, 512, 0, 192, 240, 460, 392 |
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}; |
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|
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private static readonly int[] msadpcm_coeff_table2 = new int[7] |
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{ |
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0, -256, 0, 64, 0, -208, -232 |
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}; |
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#endregion |
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|
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public WavExporter(InstanceFileManager fileManager, string outputDirPath, bool convertToPCM = false, bool noDemo = false) |
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: base(fileManager, outputDirPath) |
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{ |
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convert_to_PCM = convertToPCM; |
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do_pc_demo_test = !noDemo; |
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} |
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|
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private static void ClampToRange(ref int value, int lower, int upper) |
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{ |
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if (value > upper) |
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value = upper; |
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if (value < lower) |
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value = lower; |
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} |
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|
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protected Int16 NibbletoSampleIMA4(ref int predictor, ref int step_index, Byte nibble) |
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{ |
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int step = ima_step_table[step_index]; |
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|
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step_index += ima_index_table[nibble]; |
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ClampToRange(ref step_index, 0, 88); |
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|
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int diff = step >> 3; |
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|
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if ((nibble & 0x04) != 0) diff += step; |
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if ((nibble & 0x02) != 0) diff += (step >> 1); |
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if ((nibble & 0x01) != 0) diff += (step >> 2); |
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if ((nibble & 0x08) != 0) |
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predictor -= diff; |
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else |
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predictor += diff; |
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|
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ClampToRange(ref predictor, -32768, 32767); |
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return (Int16)predictor; |
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} |
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|
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protected Int16 NibbletoSampleMSADPCM(ref Int16 sample1, ref Int16 sample2, ref UInt16 delta, Byte pred_index, Byte nibble) |
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{ |
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int coeff1 = msadpcm_coeff_table1[pred_index]; |
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int coeff2 = msadpcm_coeff_table2[pred_index]; |
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|
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int prediction = ((int)sample1 * (int)coeff1 + (int)sample2 * (int)coeff2) >> 8; |
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|
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int snibble = (nibble < 8) ? nibble : (nibble - 16); |
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int correction = snibble * (int)delta; |
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|
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int sample = prediction + correction; |
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ClampToRange(ref sample, -32768, 32767); |
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|
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sample2 = sample1; |
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sample1 = (Int16)sample; |
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|
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int newDelta = delta * msadpcm_adapt_table[nibble]; |
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newDelta >>= 8; |
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ClampToRange(ref newDelta, 16, 65535); |
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delta = (UInt16)newDelta; |
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|
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return (Int16)sample; |
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} |
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|
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protected override void ExportInstance(InstanceDescriptor descriptor) |
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{ |
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var sound = SoundData.Read(descriptor, do_pc_demo_test); |
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|
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using (var stream = File.Create(Path.Combine(OutputDirPath, descriptor.FullName + ".wav"))) |
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using (var writer = new BinaryWriter(stream)) |
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{ |
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var blockSizeADPCM = 512 * sound.ChannelCount * sound.SampleRate / 22050; |
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int wholeBlocks = sound.Data.Length / blockSizeADPCM; |
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int leftoverBytes = sound.Data.Length - (wholeBlocks * blockSizeADPCM); |
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int leftoverSamples = 8 * (leftoverBytes - 7 * sound.ChannelCount) |
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/ 4 / sound.ChannelCount + 2; // 4 bits per sample |
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int paddingBytes = 0; |
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if (leftoverBytes > 0) // incomplete trailing block |
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paddingBytes = blockSizeADPCM - leftoverBytes; |
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var samplesPerBlock = 2 + (blockSizeADPCM - sound.ChannelCount * 7) * 8 / sound.ChannelCount / 4; |
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|
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Int32 sampleCount = sampleCount = wholeBlocks * samplesPerBlock + leftoverSamples; |
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|
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if (sound.IsIMA4) // IMA4 ADPCM format |
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{ |
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blockSizeADPCM = 34 * sound.ChannelCount; |
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samplesPerBlock = 64; |
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sampleCount = (sound.Data.Length / blockSizeADPCM) * samplesPerBlock; |
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} |
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if (!convert_to_PCM) |
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{ |
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if (sound.IsIMA4) |
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{ |
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throw new NotSupportedException("Transcoding from IMA4 ADPCM (Mac) to MS ADPCM (PC) not supported! Please use -extract:pcm"); |
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} |
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var format = (byte[])formatTemplate_ADPCM.Clone(); |
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var fact = (byte[])factTemplate.Clone(); // needed for ADPCM (to specify the actual sample count) |
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|
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var averageRate = sound.SampleRate * blockSizeADPCM / samplesPerBlock; |
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Array.Copy(BitConverter.GetBytes(sound.ChannelCount), 0, format, 2, 2); |
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Array.Copy(BitConverter.GetBytes(sound.SampleRate), 0, format, 4, 4); |
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Array.Copy(BitConverter.GetBytes(averageRate), 0, format, 8, 4); |
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Array.Copy(BitConverter.GetBytes(blockSizeADPCM), 0, format, 12, 2); |
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Array.Copy(BitConverter.GetBytes(samplesPerBlock), 0, format, 18, 2); |
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|
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Array.Copy(BitConverter.GetBytes(sampleCount), 0, fact, 0, 4); |
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|
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writer.Write(fcc_RIFF); |
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writer.Write(8 + format.Length + 8 + fact.Length + 8 + sound.Data.Length + paddingBytes); |
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writer.Write(fcc_WAVE); |
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|
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// |
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// write format chunk |
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// |
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writer.Write(fcc_fmt); |
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writer.Write(format.Length); |
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writer.Write(format); |
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|
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// |
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// write fact chunk |
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// |
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writer.Write(fcc_fact); |
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writer.Write(fact.Length); |
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writer.Write(fact); |
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|
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// |
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// write data chunk |
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// |
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writer.Write(fcc_data); |
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writer.Write(sound.Data.Length + paddingBytes); |
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writer.Write(sound.Data); |
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|
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Byte c = 0; |
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for (int i = 0; i < paddingBytes; i++) |
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writer.Write(c); |
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} |
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else |
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{ |
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var format = (byte[])formatTemplate_PCM.Clone(); |
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|
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var blockSizePCM = 2 * sound.ChannelCount; // 16-bit samples or sample pairs |
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samplesPerBlock = 2; |
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var averageRate = sound.SampleRate * blockSizePCM / samplesPerBlock; |
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Array.Copy(BitConverter.GetBytes(sound.ChannelCount), 0, format, 2, 2); |
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Array.Copy(BitConverter.GetBytes(sound.SampleRate), 0, format, 4, 4); |
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Array.Copy(BitConverter.GetBytes(averageRate), 0, format, 8, 4); |
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Array.Copy(BitConverter.GetBytes(blockSizePCM), 0, format, 12, 2); |
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|
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int dataSize = blockSizePCM * sampleCount; |
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|
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writer.Write(fcc_RIFF); |
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writer.Write(8 + format.Length + 8 + dataSize); |
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writer.Write(fcc_WAVE); |
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|
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// |
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// write format chunk |
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// |
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|
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writer.Write(fcc_fmt); |
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writer.Write(format.Length); |
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writer.Write(format); |
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|
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// |
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// write data chunk |
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// |
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var samplesL = new Int16[sampleCount]; |
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var samplesR = new Int16[sampleCount]; |
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if (sound.IsIMA4) // decode IMA4 into linear signed 16-bit PCM |
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{ |
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int pos = 0; |
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|
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int iSampleL = 0; |
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int predictorL = 0; |
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int stepIndexL = 0; |
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int iSampleR = 0; |
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int predictorR = 0; |
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int stepIndexR = 0; |
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|
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int nBlocks = sound.Data.Length / blockSizeADPCM; |
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for (int block = 0; block < nBlocks; block++) |
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{ |
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byte headerHiL = sound.Data[pos++]; |
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byte headerLoL = sound.Data[pos++]; |
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if (block == 0) // non-standard decoding: predictor initialization ignored after start |
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{ |
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predictorL = ((((headerHiL << 1) | (headerLoL >> 7))) << 7); |
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if (predictorL > 32767) predictorL -= 65536; |
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} |
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stepIndexL = headerLoL & 0x7f; |
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if (stepIndexL > 88) |
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Console.WriteLine("Block {0} (L): Initial IMA4 step index is {1}, clamping to 88.", block, stepIndexL); |
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ClampToRange(ref stepIndexL, 0, 88); |
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|
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for (int b = 0; b < 32; b++) |
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{ |
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Byte nibblesL = sound.Data[pos++]; |
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Byte nibbleHiL = (Byte)(nibblesL >> 4); |
| 282 |
Byte nibbleLoL = (Byte)(nibblesL & 0xF); |
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|
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samplesL[iSampleL++] = NibbletoSampleIMA4(ref predictorL, ref stepIndexL, nibbleLoL); |
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samplesL[iSampleL++] = NibbletoSampleIMA4(ref predictorL, ref stepIndexL, nibbleHiL); |
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} |
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|
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if (sound.ChannelCount == 2) |
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{ |
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byte headerHiR = sound.Data[pos++]; |
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byte headerLoR = sound.Data[pos++]; |
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if (block == 0) // non-standard decoding: predictor initialization ignored after start |
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{ |
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predictorR = ((((headerHiR << 1) | (headerLoR >> 7))) << 7); |
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if (predictorR > 32767) predictorR -= 65536; |
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} |
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stepIndexR = headerLoR & 0x7f; |
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if (stepIndexR > 88) |
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Console.WriteLine("Block {0} (R): Initial IMA4 step index is {1}, clamping to 88.", block, stepIndexR); |
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ClampToRange(ref stepIndexR, 0, 88); |
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|
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for (int b = 0; b < 32; b++) |
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{ |
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Byte nibblesR = sound.Data[pos++]; |
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Byte nibbleHiR = (Byte)(nibblesR >> 4); |
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Byte nibbleLoR = (Byte)(nibblesR & 0xF); |
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|
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samplesR[iSampleR++] = NibbletoSampleIMA4(ref predictorR, ref stepIndexR, nibbleLoR); |
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samplesR[iSampleR++] = NibbletoSampleIMA4(ref predictorR, ref stepIndexR, nibbleHiR); |
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} |
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} |
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} |
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} |
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else // decode MSADPCM into linear signed 16-bit PCM |
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{ |
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int pos = 0; |
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Byte pred_indexL = 0, pred_indexR = 0; |
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UInt16 deltaL = 0, deltaR = 0; |
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int iSampleL = 0; |
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int iSampleR = 0; |
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Int16 sample1L = 0, sample2L = 0; |
| 322 |
Int16 sample1R = 0, sample2R = 0; |
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|
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while (pos < sound.Data.Length) |
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{ |
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if ((pos % blockSizeADPCM) == 0) // read block header |
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{ |
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pred_indexL = sound.Data[pos++]; |
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if (sound.ChannelCount == 2) |
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pred_indexR = sound.Data[pos++]; |
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Byte deltaLo = sound.Data[pos++]; |
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Byte deltaHi = sound.Data[pos++]; |
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deltaL = (UInt16)(deltaLo + 256 * deltaHi); |
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if (sound.ChannelCount == 2) |
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{ |
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deltaLo = sound.Data[pos++]; |
| 337 |
deltaHi = sound.Data[pos++]; |
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deltaR = (UInt16)(deltaLo + 256 * deltaHi); |
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} |
| 340 |
Byte sampleLo = sound.Data[pos++]; |
| 341 |
Byte sampleHi = sound.Data[pos++]; |
| 342 |
UInt16 usample = (UInt16)(sampleLo + 256 * sampleHi); |
| 343 |
sample1L = (Int16)((usample < 32767) ? usample : (usample - 65536)); |
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if (sound.ChannelCount == 2) |
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{ |
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sampleLo = sound.Data[pos++]; |
| 347 |
sampleHi = sound.Data[pos++]; |
| 348 |
usample = (UInt16)(sampleLo + 256 * sampleHi); |
| 349 |
sample1R = (Int16)((usample < 32767) ? usample : (usample - 65536)); |
| 350 |
} |
| 351 |
sampleLo = sound.Data[pos++]; |
| 352 |
sampleHi = sound.Data[pos++]; |
| 353 |
usample = (UInt16)(sampleLo + 256 * sampleHi); |
| 354 |
sample2L = (Int16)((usample < 32767) ? usample : (usample - 65536)); |
| 355 |
if (sound.ChannelCount == 2) |
| 356 |
{ |
| 357 |
sampleLo = sound.Data[pos++]; |
| 358 |
sampleHi = sound.Data[pos++]; |
| 359 |
usample = (UInt16)(sampleLo + 256 * sampleHi); |
| 360 |
sample2R = (Int16)((usample < 32767) ? usample : (usample - 65536)); |
| 361 |
} |
| 362 |
samplesL[iSampleL++] = sample2L; |
| 363 |
samplesL[iSampleL++] = sample1L; |
| 364 |
if (sound.ChannelCount == 2) |
| 365 |
{ |
| 366 |
samplesR[iSampleR++] = sample2R; |
| 367 |
samplesR[iSampleR++] = sample1R; |
| 368 |
} |
| 369 |
} |
| 370 |
else // read pair of nibbles |
| 371 |
{ |
| 372 |
Byte nibbles = sound.Data[pos++]; |
| 373 |
Byte nibbleHi = (Byte)(nibbles >> 4); |
| 374 |
Byte nibbleLo = (Byte)(nibbles & 0xF); |
| 375 |
samplesL[iSampleL++] = NibbletoSampleMSADPCM(ref sample1L, ref sample2L, ref deltaL, pred_indexL, nibbleHi); |
| 376 |
if (sound.ChannelCount == 2) |
| 377 |
samplesR[iSampleR++] = NibbletoSampleMSADPCM(ref sample1R, ref sample2R, ref deltaR, pred_indexR, nibbleLo); |
| 378 |
else |
| 379 |
samplesL[iSampleL++] = NibbletoSampleMSADPCM(ref sample1L, ref sample2L, ref deltaL, pred_indexL, nibbleLo); |
| 380 |
} |
| 381 |
} |
| 382 |
} |
| 383 |
writer.Write(fcc_data); |
| 384 |
writer.Write(dataSize); |
| 385 |
for (int smp = 0; smp < sampleCount; smp++) |
| 386 |
{ |
| 387 |
writer.Write(samplesL[smp]); |
| 388 |
if(sound.ChannelCount == 2) |
| 389 |
writer.Write(samplesR[smp]); |
| 390 |
} |
| 391 |
} |
| 392 |
} |
| 393 |
} |
| 394 |
} |
| 395 |
} |
