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Support mp4a.67

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This commit is contained in:
Vanilagy
2025-01-02 15:42:04 +01:00
parent 3a7e272d2f
commit 5dda43959d
2 changed files with 27 additions and 6 deletions
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src/codec.ts
+21 -4
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@@ -2,6 +2,7 @@ import {
COLOR_PRIMARIES_MAP,
MATRIX_COEFFICIENTS_MAP,
TRANSFER_CHARACTERISTICS_MAP,
assert,
bytesToHexString,
isAllowSharedBufferSource,
last,
@@ -392,10 +393,26 @@ export const buildAudioCodecString = (codec: AudioCodec, numberOfChannels: numbe
throw new TypeError(`Unhandled codec '${codec}'.`);
};
export const extractAudioCodecString = (codec: AudioCodec, description: Uint8Array | null) => {
export type AacCodecInfo = {
isMpeg2: boolean;
};
export const extractAudioCodecString = (trackInfo: {
codec: AudioCodec | null;
codecDescription: Uint8Array | null;
aacCodecInfo: AacCodecInfo | null;
}) => {
const { codec, codecDescription, aacCodecInfo } = trackInfo;
if (codec === 'aac') {
const audioSpecificConfig = parseAacAudioSpecificConfig(description);
return `mp4a.40.${audioSpecificConfig.objectType}`;
assert(aacCodecInfo);
if (aacCodecInfo.isMpeg2) {
return 'mp4a.67';
} else {
const audioSpecificConfig = parseAacAudioSpecificConfig(codecDescription);
return `mp4a.40.${audioSpecificConfig.objectType}`;
}
} else if (codec === 'mp3') {
return 'mp3';
} else if (codec === 'opus') {
@@ -404,7 +421,7 @@ export const extractAudioCodecString = (codec: AudioCodec, description: Uint8Arr
return 'vorbis';
} else if (codec === 'flac') {
return 'flac';
} else if (codec.startsWith('pcm-')) {
} else if (codec?.startsWith('pcm-')) {
return codec;
} else if (codec === 'ulaw') {
return 'ulaw';