Slightly modify input formats

src/input-format.ts

@@ -10,22 +10,28 @@ export abstract class InputFormat {
 
 	/** @internal */
 	abstract _createDemuxer(input: Input): Demuxer;
+
+	abstract getName(): string;
+	abstract getMimeType(): string;
 }
 
 /** @public */
-export class IsobmffInputFormat extends InputFormat {
-	/** @internal */
-	override async _canReadInput(input: Input) {
+export abstract class IsobmffInputFormat extends InputFormat {
+	protected async _getMajorBrand(input: Input) {
 		const sourceSize = await input._mainReader.source._getSize();
-		if (sourceSize < 8) {
-			return false;
+		if (sourceSize < 12) {
+			return null;
 		}
 
 		const isobmffReader = new IsobmffReader(input._mainReader);
 		isobmffReader.pos = 4;
 		const fourCc = isobmffReader.readAscii(4);
 
-		return fourCc === 'ftyp';
+		if (fourCc !== 'ftyp') {
+			return null;
+		}
+
+		return isobmffReader.readAscii(4);
 	}
 
 	/** @internal */
@@ -34,6 +40,40 @@ export class IsobmffInputFormat extends InputFormat {
 	}
 }
 
+/** @public */
+export class Mp4InputFormat extends IsobmffInputFormat {
+	/** @internal */
+	override async _canReadInput(input: Input) {
+		const majorBrand = await this._getMajorBrand(input);
+		return majorBrand !== 'qt  ';
+	}
+
+	getName() {
+		return 'MP4';
+	}
+
+	getMimeType() {
+		return 'video/mp4';
+	}
+}
+
+/** @public */
+export class QuickTimeInputFormat extends IsobmffInputFormat {
+	/** @internal */
+	override async _canReadInput(input: Input) {
+		const majorBrand = await this._getMajorBrand(input);
+		return majorBrand === 'qt  ';
+	}
+
+	getName() {
+		return 'QuickTime File Format';
+	}
+
+	getMimeType() {
+		return 'video/quicktime';
+	}
+}
+
 /** @public */
 export class MatroskaInputFormat extends InputFormat {
 	/** @internal */
@@ -45,20 +85,24 @@ export class MatroskaInputFormat extends InputFormat {
 	override _createDemuxer(): never {
 		throw new Error('Not implemented');
 	}
+
+	getName() {
+		return 'Matroska';
+	}
+
+	getMimeType() {
+		return 'video/x-matroska';
+	}
 }
 
 /** @public */
-export const ISOBMFF = new IsobmffInputFormat();
+export const MP4 = new Mp4InputFormat();
 /** @public */
-export const MP4 = ISOBMFF;
-/** @public */
-export const MOV = ISOBMFF;
+export const QTFF = new QuickTimeInputFormat();
 /** @public */
 export const MATROSKA = new MatroskaInputFormat();
 /** @public */
-export const MKV = MATROSKA;
-/** @public */
 export const WEBM = MATROSKA;
 
 /** @public */
-export const ALL_FORMATS: InputFormat[] = [ISOBMFF, MKV];
+export const ALL_FORMATS: InputFormat[] = [MP4, QTFF, MATROSKA];