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Add reusable Opus identification header parsing function

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This commit is contained in:
Vanilagy
2025-02-07 20:14:01 +01:00
parent 50442691a5
commit b4d4c71916
4 changed files with 44 additions and 21 deletions
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src/isobmff/isobmff-boxes.ts
+10 -11
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@@ -16,6 +16,7 @@ import {
import {
AudioCodec,
generateAv1CodecConfigurationFromCodecString,
parseOpusIdentificationHeader,
parsePcmCodec,
PCM_AUDIO_CODECS,
PcmAudioCodec,
@@ -824,19 +825,17 @@ export const dOps = (trackData: IsobmffAudioTrackData) => {
if (description) {
assert(description.byteLength >= 18);
const view = ArrayBuffer.isView(description)
? new DataView(description.buffer, description.byteOffset, description.byteLength)
: new DataView(description);
const bytes = toUint8Array(description);
const header = parseOpusIdentificationHeader(bytes);
outputChannelCount = view.getUint8(9);
preSkip = view.getUint16(10, true);
inputSampleRate = view.getUint32(12, true);
outputGain = view.getInt16(16, true);
channelMappingFamily = view.getUint8(18);
outputChannelCount = header.outputChannelCount;
preSkip = header.preSkip;
inputSampleRate = header.inputSampleRate;
outputGain = header.outputGain;
channelMappingFamily = header.channelMappingFamily;
if (channelMappingFamily) {
const bytes = toUint8Array(description);
channelMappingTable = bytes.subarray(19, 19 + 2 + outputChannelCount);
if (header.channelMappingTable) {
channelMappingTable = header.channelMappingTable;
}
}