From 37a744889c8226001864a7c42b355e412671febd Mon Sep 17 00:00:00 2001
From: =?utf8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
Date: Sat, 23 Oct 2021 14:31:59 +0300
Subject: [PATCH] typefindfunctions: Add various CMAF brands to the MP4
 typefinder

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1234>
---
 .../gst/typefind/gsttypefindfunctions.c            | 34 ++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/subprojects/gst-plugins-base/gst/typefind/gsttypefindfunctions.c b/subprojects/gst-plugins-base/gst/typefind/gsttypefindfunctions.c
index fcba8be..38705e8 100644
--- a/subprojects/gst-plugins-base/gst/typefind/gsttypefindfunctions.c
+++ b/subprojects/gst-plugins-base/gst/typefind/gsttypefindfunctions.c
@@ -3412,6 +3412,27 @@ qt_type_find (GstTypeFind * tf, gpointer unused)
   guint64 size;
   const gchar *variant = NULL;
   static const gchar *qt_brands[] = { "qt  " };
+  static const gchar *cmaf_brands[] = {
+    "cmf2",
+    "cmfc",
+    /* CMAF AVC */
+    "cfsd",
+    "cfhd",
+    "chdf",
+    /* CMAF AAC */
+    "caac",
+    "caaa",
+    /* CMAF CEA closed captions */
+    "ccea",
+    /* CMAF HEVC */
+    "chhd",
+    "chh1",
+    "cud8",
+    "cud1",
+    "chd1",
+    "clg1"
+        /* TODO: CMAF WebVTT / IMSC1 */
+  };
   static const gchar *iso_brands[] = {
     "isom",
     "avc1",
@@ -3445,6 +3466,12 @@ qt_type_find (GstTypeFind * tf, gpointer unused)
         break;
       }
 
+      if (ftyp_brand_is (&data[8], cmaf_brands, G_N_ELEMENTS (cmaf_brands))) {
+        tip = GST_TYPE_FIND_MAXIMUM;
+        variant = "cmaf";
+        break;
+      }
+
       if (ftyp_brand_is (&data[8], iso_brands, G_N_ELEMENTS (iso_brands))) {
         tip = GST_TYPE_FIND_MAXIMUM;
         variant = "iso";
@@ -3530,6 +3557,13 @@ qt_type_find (GstTypeFind * tf, gpointer unused)
         goto done;
       new_offset = 12;
       while (new_offset + 4 <= size) {
+        if (ftyp_brand_is (&data[new_offset], cmaf_brands,
+                G_N_ELEMENTS (cmaf_brands))) {
+          tip = GST_TYPE_FIND_MAXIMUM;
+          variant = "cmaf";
+          goto done;
+        }
+
         if (ftyp_brand_is (&data[new_offset], iso_brands,
                 G_N_ELEMENTS (iso_brands))) {
           tip = GST_TYPE_FIND_MAXIMUM;
-- 
2.7.4