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Add track name support

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This commit is contained in:
Vanilagy
2025-08-23 15:33:44 +02:00
parent 0e03779169
commit bb1b20afa7
17 changed files with 196 additions and 16 deletions
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src/isobmff/isobmff-boxes.ts
+73 -10
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@@ -31,6 +31,7 @@ import {
import { formatSubtitleTimestamp } from '../subtitles';
import { Writer } from '../writer';
import {
getTrackMetadata,
GLOBAL_TIMESCALE,
intoTimescale,
IsobmffAudioTrackData,
@@ -378,10 +379,72 @@ export const mvhd = (
* independent of the other tracks in the movie and carries its own temporal and spatial information. Each Track Box
* contains its associated Media Box.
*/
export const trak = (trackData: IsobmffTrackData, creationTime: number) => box('trak', undefined, [
tkhd(trackData, creationTime),
mdia(trackData, creationTime),
]);
export const trak = (trackData: IsobmffTrackData, creationTime: number) => {
const trackMetadata = getTrackMetadata(trackData);
return box('trak', undefined, [
tkhd(trackData, creationTime),
mdia(trackData, creationTime),
trackMetadata.name !== undefined
? box('udta', undefined, [
box('©nam', [
...textEncoder.encode(trackMetadata.name),
]),
])
: null,
]);
};
/*
const meta = (trackData: IsobmffTrackData) => {
const trackMetadata = getTrackMetadata(trackData);
if (trackData.muxer.isQuickTime) {
const keyMap: Record<keyof IsobmffMetadata, string> = {
name: 'com.apple.quicktime.title',
};
return box('meta', undefined, [
hdlr(false, 'mdta', ''),
fullBox('keys', 0, 0, [
u32(Object.keys(trackMetadata).length),
], Object.keys(trackMetadata).map(key =>
box('mdta', [
ascii(keyMap[key as keyof IsobmffMetadata]), // Key name
]),
)),
box('ilst', undefined, Object.values(trackMetadata)
.map((value, i) => box(u32(i + 1).map(x => String.fromCharCode(x)).join(''), undefined, [
data(value),
]))),
]);
} else {
const keyMap: Record<keyof IsobmffMetadata, string> = {
name: '©nam',
};
return fullBox('meta', 0, 0, undefined, [
hdlr(false, 'mdir', ''),
box('ilst', undefined, Object.entries(trackMetadata)
.map(([key, value]) => box(keyMap[key as keyof IsobmffMetadata], undefined, [
data(value),
]))),
]);
}
};
const data = (value: unknown) => {
if (typeof value === 'string') {
return box('data', [
u32(1), // Type indicator (UTF-8)
u32(0), // Locale indicator
...textEncoder.encode(value),
]);
}
throw new Error('Unhandled data type.');
};
*/
/** Track Header Box: Specifies the characteristics of a single track within a movie. */
export const tkhd = (
@@ -425,7 +488,7 @@ export const tkhd = (
/** Media Box: Describes and define a track's media type and sample data. */
export const mdia = (trackData: IsobmffTrackData, creationTime: number) => box('mdia', undefined, [
mdhd(trackData, creationTime),
hdlr(trackData),
hdlr(true, TRACK_TYPE_TO_COMPONENT_SUBTYPE[trackData.type], TRACK_TYPE_TO_HANDLER_NAME[trackData.type]),
minf(trackData),
]);
@@ -471,14 +534,14 @@ const TRACK_TYPE_TO_HANDLER_NAME: Record<IsobmffTrackData['type'], string> = {
subtitle: 'MediabunnyTextHandler',
};
/** Handler Reference Box: Specifies the media handler component that is to be used to interpret the media's data. */
export const hdlr = (trackData: IsobmffTrackData) => fullBox('hdlr', 0, 0, [
ascii('mhlr'), // Component type
ascii(TRACK_TYPE_TO_COMPONENT_SUBTYPE[trackData.type]), // Component subtype
/** Handler Reference Box. */
export const hdlr = (hasComponentType: boolean, handlerType: string, name: string) => fullBox('hdlr', 0, 0, [
hasComponentType ? ascii('mhlr') : u32(0), // Component type
ascii(handlerType), // Component subtype
u32(0), // Component manufacturer
u32(0), // Component flags
u32(0), // Component flags mask
ascii(TRACK_TYPE_TO_HANDLER_NAME[trackData.type], true), // Component name
ascii(name, true), // Component name
]);
/**