From 2d5abd46d22c32e6442ac98572323c31d126ffff Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luk=C3=A1=C5=A1=20Lalinsk=C3=BD?= <lukas@oxygene.sk>
Date: Tue, 8 Oct 2013 17:41:09 +0200
Subject: [PATCH] Added TagLib::MP4::PropertyMap::codec()

---
 NEWS                         |  1 +
 taglib/mp4/mp4properties.cpp | 16 ++++++++++++----
 taglib/mp4/mp4properties.h   |  9 +++++++++
 tests/test_mp4.cpp           |  2 ++
 4 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/NEWS b/NEWS
index 6f34d8c4..72d41fba 100644
--- a/NEWS
+++ b/NEWS
@@ -5,6 +5,7 @@ TagLib 1.9.1 (Oct 8, 2013)
  * Fixed constructing String from ByteVector.
  * Fixed compilation on MSVC with the /Zc:wchar_t- option.
  * Fixed detecting of RIFF files with invalid chunk sizes.
+ * Added TagLib::MP4::PropertyMap::codec().
 
 TagLib 1.9 (Oct 6, 2013)
 ========================
diff --git a/taglib/mp4/mp4properties.cpp b/taglib/mp4/mp4properties.cpp
index 058cc61c..5a41c081 100644
--- a/taglib/mp4/mp4properties.cpp
+++ b/taglib/mp4/mp4properties.cpp
@@ -34,7 +34,7 @@ using namespace TagLib;
 class MP4::Properties::PropertiesPrivate
 {
 public:
-  PropertiesPrivate() : length(0), bitrate(0), sampleRate(0), channels(0), bitsPerSample(0), encrypted(false) {}
+  PropertiesPrivate() : length(0), bitrate(0), sampleRate(0), channels(0), bitsPerSample(0), encrypted(false), codec(MP4::Properties::Unknown) {}
 
   int length;
   int bitrate;
@@ -42,6 +42,7 @@ public:
   int channels;
   int bitsPerSample;
   bool encrypted;
+  Codec codec;
 };
 
 MP4::Properties::Properties(File *file, MP4::Atoms *atoms, ReadStyle style)
@@ -114,6 +115,7 @@ MP4::Properties::Properties(File *file, MP4::Atoms *atoms, ReadStyle style)
   file->seek(atom->offset);
   data = file->readBlock(atom->length);
   if(data.mid(20, 4) == "mp4a") {
+    d->codec         = AAC;
     d->channels      = data.toShort(40U);
     d->bitsPerSample = data.toShort(42U);
     d->sampleRate    = data.toUInt(46U);
@@ -135,10 +137,11 @@ MP4::Properties::Properties(File *file, MP4::Atoms *atoms, ReadStyle style)
   }
   else if (data.mid(20, 4) == "alac") {
     if (atom->length == 88 && data.mid(56, 4) == "alac") {
+      d->codec         = ALAC;
       d->bitsPerSample = data.at(69);
-      d->channels   = data.at(73);
-      d->bitrate    = data.toUInt(80U) / 1000;
-      d->sampleRate = data.toUInt(84U);
+      d->channels      = data.at(73);
+      d->bitrate       = data.toUInt(80U) / 1000;
+      d->sampleRate    = data.toUInt(84U);
     }
   }
 
@@ -189,3 +192,8 @@ MP4::Properties::isEncrypted() const
   return d->encrypted;
 }
 
+MP4::Properties::Codec MP4::Properties::codec() const
+{
+  return d->codec;
+}
+
diff --git a/taglib/mp4/mp4properties.h b/taglib/mp4/mp4properties.h
index 7906824d..2607c366 100644
--- a/taglib/mp4/mp4properties.h
+++ b/taglib/mp4/mp4properties.h
@@ -40,6 +40,12 @@ namespace TagLib {
     class TAGLIB_EXPORT Properties : public AudioProperties
     {
     public:
+      enum Codec {
+        Unknown = 0,
+        AAC,
+        ALAC
+      };
+
       Properties(File *file, Atoms *atoms, ReadStyle style = Average);
       virtual ~Properties();
 
@@ -50,6 +56,9 @@ namespace TagLib {
       virtual int bitsPerSample() const;
       bool isEncrypted() const;
 
+      //! Audio codec used in the MP4 file
+      Codec codec() const;
+
     private:
       class PropertiesPrivate;
       PropertiesPrivate *d;
diff --git a/tests/test_mp4.cpp b/tests/test_mp4.cpp
index be7ad2c3..56b60525 100644
--- a/tests/test_mp4.cpp
+++ b/tests/test_mp4.cpp
@@ -39,6 +39,7 @@ public:
     CPPUNIT_ASSERT_EQUAL(2, f.audioProperties()->channels());
     CPPUNIT_ASSERT_EQUAL(44100, f.audioProperties()->sampleRate());
     CPPUNIT_ASSERT_EQUAL(16, ((MP4::Properties *)f.audioProperties())->bitsPerSample());
+    CPPUNIT_ASSERT_EQUAL(MP4::Properties::AAC, ((MP4::Properties *)f.audioProperties())->codec());
   }
 
   void testPropertiesALAC()
@@ -49,6 +50,7 @@ public:
     CPPUNIT_ASSERT_EQUAL(2, f.audioProperties()->channels());
     CPPUNIT_ASSERT_EQUAL(44100, f.audioProperties()->sampleRate());
     CPPUNIT_ASSERT_EQUAL(16, ((MP4::Properties *)f.audioProperties())->bitsPerSample());
+    CPPUNIT_ASSERT_EQUAL(MP4::Properties::ALAC, ((MP4::Properties *)f.audioProperties())->codec());
   }
 
   void testCheckValid()