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fix: reverbGen.mjs

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Vasilii Milovidov 2023-10-05 04:10:35 +04:00
parent d6c8838fe2
commit 1d4eb59e94
1 changed files with 0 additions and 78 deletions
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78
packages/superdough/reverbGen.mjs
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@ -12,8 +12,6 @@
// See the License for the specific language governing permissions and
// limitations under the License.
'use strict';
var reverbGen = {};
/** Generates a reverb impulse response.
@ -72,82 +70,6 @@ reverbGen.generateGraph = function (data, width, height, min, max) {
return canvas;
};
/** Saves an AudioBuffer as a 16-bit WAV file on the client's host
file system. Normalizes it to peak at +-32767, and optionally
truncates it if there's a lot of "silence" at the end.
@param {!AudioBuffer} buffer The buffer to save.
@param {string} name Name of file to create.
@param {number?} opt_minTail Defines what counts as "silence" for
auto-truncating the buffer. If there is a point past which every
value of every channel is less than opt_minTail, then the buffer
is truncated at that point. This is expressed as an integer,
applying to the post-normalized and integer-converted
buffer. The default is 0, meaning don't truncate. */
reverbGen.saveWavFile = function (buffer, name, opt_minTail) {
var bitsPerSample = 16;
var bytesPerSample = 2;
var sampleRate = buffer.sampleRate;
var numChannels = buffer.numberOfChannels;
var channels = getAllChannelData(buffer);
var numSampleFrames = channels[0].length;
var scale = 32767;
// Find normalization constant.
var max = 0;
for (var i = 0; i < numChannels; i++) {
for (var j = 0; j < numSampleFrames; j++) {
max = Math.max(max, Math.abs(channels[i][j]));
}
}
if (max) {
scale = 32767 / max;
}
// Find truncation point.
if (opt_minTail) {
var truncateAt = 0;
for (var i = 0; i < numChannels; i++) {
for (var j = 0; j < numSampleFrames; j++) {
var absSample = Math.abs(Math.round(scale * channels[i][j]));
if (absSample > opt_minTail) {
truncateAt = j;
}
}
}
numSampleFrames = truncateAt + 1;
}
var sampleDataBytes = bytesPerSample * numChannels * numSampleFrames;
var fileBytes = sampleDataBytes + 44;
var arrayBuffer = new ArrayBuffer(fileBytes);
var dataView = new DataView(arrayBuffer);
dataView.setUint32(0, 1179011410, true); // "RIFF"
dataView.setUint32(4, fileBytes - 8, true); // file length
dataView.setUint32(8, 1163280727, true); // "WAVE"
dataView.setUint32(12, 544501094, true); // "fmt "
dataView.setUint32(16, 16, true); // fmt chunk length
dataView.setUint16(20, 1, true); // PCM format
dataView.setUint16(22, numChannels, true); // NumChannels
dataView.setUint32(24, sampleRate, true); // SampleRate
var bytesPerSampleFrame = numChannels * bytesPerSample;
dataView.setUint32(28, sampleRate * bytesPerSampleFrame, true); // ByteRate
dataView.setUint16(32, bytesPerSampleFrame, true); // BlockAlign
dataView.setUint16(34, bitsPerSample, true); // BitsPerSample
dataView.setUint32(36, 1635017060, true); // "data"
dataView.setUint32(40, sampleDataBytes, true);
for (var j = 0; j < numSampleFrames; j++) {
for (var i = 0; i < numChannels; i++) {
dataView.setInt16(44 + j * bytesPerSampleFrame + i * bytesPerSample, Math.round(scale * channels[i][j]), true);
}
}
var blob = new Blob([arrayBuffer], { type: 'audio/wav' });
var url = window.URL.createObjectURL(blob);
var linkEl = document.createElement('a');
linkEl.href = url;
linkEl.download = name;
linkEl.style.display = 'none';
document.body.appendChild(linkEl);
linkEl.click();
};
/** Applies a constantly changing lowpass filter to the given sound.
@private