parse list box

Author: JonnyBurger

packages/media-parser/src/boxes/riff/parse-fmt-box.ts

@@ -10,7 +10,6 @@ export const parseFmtBox = ({
 	boxes: RiffBox[];
 	size: number;
 }): RiffBox => {
-	const offset = iterator.counter.getOffset();
 	const header = boxes.find((b) => b.type === 'riff-header');
 	if (!header) {
 		throw new Error('Expected RIFF header');
@@ -31,8 +30,6 @@ export const parseFmtBox = ({
 	const blockAlign = iterator.getUint16Le();
 	const bitsPerSample = iterator.getUint16Le();
 
-	iterator.discard(size - (iterator.counter.getOffset() - offset));
-
 	return {
 		type: 'wave-format-box',
 		formatTag: wFormatTag,

packages/media-parser/src/boxes/riff/parse-list-box.ts

@@ -0,0 +1,21 @@
+import type {BufferIterator} from '../../buffer-iterator';
+import type {RiffBox} from './riff-box';
+
+export const parseListBox = ({
+	iterator,
+	boxes,
+	size,
+}: {
+	iterator: BufferIterator;
+	boxes: RiffBox[];
+	size: number;
+}): RiffBox => {
+	const counter = iterator.counter.getOffset();
+	const listType = iterator.getByteString(4);
+	iterator.discard(size - (iterator.counter.getOffset() - counter));
+
+	return {
+		type: 'list-box',
+		listType,
+	};
+};

packages/media-parser/src/boxes/riff/parse-riff-box.ts

@@ -1,5 +1,6 @@
 import type {BufferIterator} from '../../buffer-iterator';
 import {parseFmtBox} from './parse-fmt-box';
+import {parseListBox} from './parse-list-box';
 import type {RiffBox, RiffRegularBox} from './riff-box';
 
 export const parseRiffBox = ({
@@ -17,6 +18,10 @@ export const parseRiffBox = ({
 		return parseFmtBox({iterator, boxes, size});
 	}
 
+	if (id === 'LIST') {
+		return parseListBox({iterator, boxes, size});
+	}
+
 	iterator.discard(size);
 
 	const box: RiffRegularBox = {

packages/media-parser/src/boxes/riff/riff-box.ts

@@ -8,6 +8,11 @@ export type WaveFormatBox = {
 	bitsPerSample: number;
 };
 
+export type ListBox = {
+	type: 'list-box';
+	listType: string;
+};
+
 export type RiffRegularBox = {
 	type: 'riff-box';
 	size: number;
@@ -20,4 +25,4 @@ export type RiffHeader = {
 	fileType: string;
 };
 
-export type RiffBox = RiffRegularBox | WaveFormatBox | RiffHeader;
+export type RiffBox = RiffRegularBox | WaveFormatBox | RiffHeader | ListBox;

packages/media-parser/src/test/parse-avi-file.test.ts

@@ -18,24 +18,21 @@ test('AVI file', async () => {
 			type: 'riff-header',
 		},
 		{
-			id: 'LIST',
-			size: 8894,
-			type: 'riff-box',
+			listType: 'hdrl',
+			type: 'list-box',
 		},
 		{
-			id: 'LIST',
-			size: 26,
-			type: 'riff-box',
+			listType: 'INFO',
+			type: 'list-box',
 		},
 		{
 			id: 'JUNK',
 			size: 1016,
 			type: 'riff-box',
 		},
 		{
-			id: 'LIST',
-			size: 695114,
-			type: 'riff-box',
+			listType: 'movi',
+			type: 'list-box',
 		},
 		{
 			id: 'idx1',

packages/media-parser/src/test/parse-wav-file.test.ts

@@ -32,9 +32,8 @@ test('WAV file', async () => {
 			type: 'riff-box',
 		},
 		{
-			id: 'LIST',
-			size: 46,
-			type: 'riff-box',
+			listType: 'INFO',
+			type: 'list-box',
 		},
 		{
 			id: 'id3',