1 | /*! |
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2 | * wavefile |
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3 | * Read & write wave files with 8, 16, 24, 32 PCM, 32 IEEE & 64-bit data. |
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4 | * Copyright (c) 2017 Rafael da Silva Rocha. |
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5 | * https://github.com/rochars/wavefile |
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6 | * |
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7 | */ |
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8 | |||
9 | const bitDepthLib = require("bitdepth"); |
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10 | const waveFileReaderWriter = require("./src/wavefile-reader-writer"); |
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11 | |||
12 | /** |
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13 | * WaveFile |
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14 | */ |
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15 | class WaveFile extends waveFileReaderWriter.WaveFileReaderWriter { |
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16 | |||
17 | /** |
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18 | * @param {Uint8Array} bytes The file bytes. |
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19 | * @param {Uint8Array} buffer A wave file buffer. |
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20 | * @param {boolean} enforceFact True if it should throw a error |
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21 | * if no "fact" chunk is found. |
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22 | * @param {boolean} enforceBext True if it should throw a error |
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23 | * if no "bext" chunk is found. |
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24 | */ |
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25 | constructor(buffer, enforceFact=false, enforceBext=false) { |
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26 | super(enforceFact, enforceBext); |
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27 | if(buffer) { |
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28 | this.fromBuffer(buffer); |
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29 | } |
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30 | } |
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31 | |||
32 | /** |
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33 | * Turn the file to RIFF. |
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34 | * All values will be little-endian when writing. |
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35 | */ |
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36 | toRIFF() { |
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37 | this.chunkId = "RIFF"; |
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38 | } |
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39 | |||
40 | /** |
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41 | * Turn the file to RIFX. |
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42 | * All values but FourCCs will be big-endian when writing. |
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43 | */ |
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44 | toRIFX() { |
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45 | this.chunkId = "RIFX"; |
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46 | } |
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47 | |||
48 | /** |
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49 | * Change the bit depth of the data. |
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50 | * @param {string} bitDepth The new bit depth of the data. |
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51 | * One of "8", "16", "24", "32", "32f", "64" |
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52 | */ |
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53 | toBitDepth(bitDepth) { |
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54 | bitDepthLib.toBitDepth(this.samples_, this.bitDepth_, bitDepth); |
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55 | this.fromScratch( |
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56 | this.numChannels, |
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57 | this.sampleRate, |
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58 | bitDepth, |
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59 | this.samples_, |
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60 | {"container": this.chunkId} |
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61 | ); |
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62 | } |
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63 | |||
64 | /** |
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65 | * Interleave multi-channel samples. |
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66 | */ |
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67 | interleave() { |
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68 | let finalSamples = []; |
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69 | let i; |
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70 | let j; |
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71 | let numChannels = this.samples_[0].length; |
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72 | for (i = 0; i < numChannels; i++) { |
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73 | for (j = 0; j < this.samples_.length; j++) { |
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74 | finalSamples.push(this.samples_[j][i]); |
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75 | } |
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76 | } |
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77 | this.samples_ = finalSamples; |
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78 | } |
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79 | |||
80 | /** |
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81 | * De-interleave samples into multiple channels. |
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82 | */ |
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83 | deInterleave() { |
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84 | let finalSamples = []; |
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85 | let i; |
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86 | for (i = 0; i < this.numChannels; i++) { |
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87 | finalSamples[i] = []; |
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88 | } |
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89 | i = 0; |
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90 | let j; |
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91 | while (i < this.samples_.length) { |
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92 | for (j = 0; j < this.numChannels; j++) { |
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93 | finalSamples[j].push(this.samples_[i+j]); |
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94 | } |
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95 | i += j; |
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96 | } |
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97 | this.samples_ = finalSamples; |
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98 | } |
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99 | } |
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100 | |||
101 | module.exports.WaveFile = WaveFile; |
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102 | |||
103 |