From 4478cf59587f01a66402f9e928c7781642e71d57 Mon Sep 17 00:00:00 2001
From: Muaz Ahmad <mahmad2000@protonmail.com>
Date: Thu, 14 Sep 2023 12:17:51 +0500
Subject: [PATCH] basic vp9 codec string parsing

---
 mp4-tree.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/mp4-tree.js b/mp4-tree.js
index 083442b..4fa241a 100644
--- a/mp4-tree.js
+++ b/mp4-tree.js
@@ -60,6 +60,8 @@ class MP4Tree {
 				const media_sample = this.read_next_head().name;
 				if (media_sample == 'avc1') {
 					this.parse_avc1();
+				} else if (media_sample == 'vp09') {
+					this.parse_vp09();
 				} else if (media_sample == 'mp4a') {
 					this.parse_mp4a();
 				} else if (media_sample == 'Opus') {
@@ -82,6 +84,15 @@ class MP4Tree {
 		this.codecs.push('avc1.' + avc_profile);
 	}
 
+	parse_vp09() {
+		this.parse_into('vp09', 86);
+		this.parse_into('vpcC', 12);
+		const profile = this.data.getUint8(this.idx).toString().padStart(2, "0");
+		const level = this.data.getUint8(this.idx + 1).toString();
+		const depth = (this.data.getUint8(this.idx + 2) & 0xf0).toString().padStart(2, "0");
+		this.codecs.push(["vp09", profile, level, depth].join('.'));
+	}
+
 	parse_mp4a() {
 		this.parse_into('mp4a', 36); // 28 bytes of subboxes with unclear offsets
 		this.parse_into('esds', 12);