From 7817adba9347b0468dd3da47e70ca442ced55514 Mon Sep 17 00:00:00 2001
From: roytam1 <roytam@gmail.com>
Date: Fri, 10 Jan 2025 22:50:50 +0800
Subject: [PATCH] import from UXP: Issue #2673 - Part 4: Hook up the ADTS
 sniffer + raw AAC MIME type. (d63a56ad)

---
 netwerk/mime/nsMimeTypes.h                         |  1 +
 toolkit/components/mediasniffer/nsMediaSniffer.cpp | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/netwerk/mime/nsMimeTypes.h b/netwerk/mime/nsMimeTypes.h
index aba444de2..41950a7e7 100644
--- a/netwerk/mime/nsMimeTypes.h
+++ b/netwerk/mime/nsMimeTypes.h
@@ -88,6 +88,7 @@
 #define AUDIO_3GPP2                         "audio/3gpp2"
 #define AUDIO_MIDI                          "audio/x-midi"
 #define AUDIO_MATROSKA                      "audio/x-matroska"
+#define AUDIO_AAC                           "audio/aac"
 
 #define BINARY_OCTET_STREAM                 "binary/octet-stream"
 
diff --git a/toolkit/components/mediasniffer/nsMediaSniffer.cpp b/toolkit/components/mediasniffer/nsMediaSniffer.cpp
index e9dc5dbd5..d00dea894 100644
--- a/toolkit/components/mediasniffer/nsMediaSniffer.cpp
+++ b/toolkit/components/mediasniffer/nsMediaSniffer.cpp
@@ -3,6 +3,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+#include "ADTSDemuxer.h"
 #include "FlacDemuxer.h"
 #include "mozilla/ArrayUtils.h"
 #include "mozilla/ModuleUtils.h"
@@ -125,6 +126,11 @@ MatchesFLAC(const uint8_t* aData, const uint32_t aLength) {
   return mozilla::FlacDemuxer::FlacSniffer(aData, aLength);
 }
 
+static bool MatchesADTS(const uint8_t* aData, const uint32_t aLength)
+{
+  return mozilla::ADTSDemuxer::ADTSSniffer(aData, aLength);
+}
+
 NS_IMETHODIMP
 nsMediaSniffer::GetMIMETypeFromContent(nsIRequest* aRequest,
                                        const uint8_t* aData,
@@ -183,6 +189,13 @@ nsMediaSniffer::GetMIMETypeFromContent(nsIRequest* aRequest,
     return NS_OK;
   }
 
+  // Note: Sniff for ADTS content before flac.
+  // The flac decoder can easily produce false negatives.
+  if (MatchesADTS(aData, clampedLength)) {
+    aSniffedType.AssignLiteral(AUDIO_AAC);
+    return NS_OK;
+  }
+
   // Flac frames are generally big, often in excess of 24kB.
   // Using a size of MAX_BYTES_SNIFFED effectively means that we will only
   // recognize flac content if it starts with a frame.