From 99df77baf2946c09ceb5bd103f28c092d04738bb Mon Sep 17 00:00:00 2001
From: klirktag <78051485+klirktag@users.noreply.github.com>
Date: Tue, 14 Nov 2023 00:06:50 +0100
Subject: [PATCH] patterns/mp4: Add childbox support for STBL boxes (#192)

* find childboxes in stbl

* add implementation for SampleDescriptionBox
---
 patterns/mp4.hexpat | 32 +++++++++++++++++++++++++++-----
 1 file changed, 27 insertions(+), 5 deletions(-)

diff --git a/patterns/mp4.hexpat b/patterns/mp4.hexpat
index f082aa9..713fba7 100644
--- a/patterns/mp4.hexpat
+++ b/patterns/mp4.hexpat
@@ -157,6 +157,32 @@ struct VideoMediaHeaderBox : FullBox {
     u16 opcolor[3];
 };
 
+struct SubSampleDescriptionBox {
+    u32 type = std::mem::read_unsigned($ + 4, 4, std::mem::Endian::Big);
+
+    match (str(type)) {
+        (_): UnknownBox box [[inline]];
+    }
+} [[name(std::format("SubSampleDescriptionBox({})", box.type))]];
+
+struct SampleDescriptionBox : FullBox {
+        u32 entry_count;
+        SubSampleDescriptionBox box[while($ < endOffset)] [[inline]];
+};
+
+struct SubSampleBoxTable {
+    u32 type = std::mem::read_unsigned($ + 4, 4, std::mem::Endian::Big);
+
+    match (str(type)) {
+        ("stsd"): SampleDescriptionBox box [[inline]];
+        (_): UnknownBox box [[inline]];
+    }
+} [[name(std::format("SubSampleBoxTable({})", box.type))]];
+
+struct SampleBoxTable : BaseBox {
+    SubSampleBoxTable box[while($ < endOffset)] [[inline]];
+};
+
 struct SubMediaInformationBox {
     u32 type = std::mem::read_unsigned($ + 4, 4, std::mem::Endian::Big);
 
@@ -164,6 +190,7 @@ struct SubMediaInformationBox {
         ("vmhd"): VideoMediaHeaderBox box [[inline]];
         ("hdlr"): HandlerBox box [[inline]];
         ("dinf"): DataInformationBox box [[inline]];
+        ("stbl"): SampleBoxTable box [[inline]];
         (_): UnknownBox box [[inline]];
     }
 } [[name(std::format("MediaInformationBox({})", box.type))]];
@@ -172,10 +199,6 @@ struct MediaInformationBox : BaseBox {
     SubMediaInformationBox box[while($ < endOffset)] [[inline]];
 };
 
-struct SampleBoxTable : FullBox {
-    SubMediaInformationBox box[while($ < endOffset)] [[inline]];
-};
-
 struct MediaHeaderBox : FullBox {
     if (this.version == 1) {
         u64 creation_time;
@@ -199,7 +222,6 @@ struct SubMediaBox {
         ("mdhd"): MediaHeaderBox box [[inline]];
         ("hdlr"): HandlerBox box [[inline]];
         ("minf"): MediaInformationBox box [[inline]];
-        ("sbtl"): SampleBoxTable box [[inline]];
         (_): UnknownBox box [[inline]];
     }
 } [[name(std::format("MediaBox({})", box.type))]];