Audio: add getters to Buffer.

src/Magnum/Audio/Buffer.h

@@ -5,6 +5,7 @@
 
     Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019
               Vladimír Vondruš <mosra@centrum.cz>
+    Copyright © 2019 Guillaume Jacquemin <williamjcm@users.noreply.github.com>
 
     Permission is hereby granted, free of charge, to any person obtaining a
     copy of this software and associated documentation files (the "Software"),
@@ -102,6 +103,44 @@ class Buffer {
             return *this;
         }
 
+        /**
+         * @brief Get buffer size
+         * @return The buffer's size in bytes
+         */
+        ALint size() {
+            ALint size;
+            alGetBufferi(_id, AL_SIZE, &size);
+            return size;
+        }
+
+        /**
+         * @brief Get buffer channels
+         * @return The buffer's number of channels
+         */
+        ALint channels() {
+            ALint channels;
+            alGetBufferi(_id, AL_CHANNELS, &channels);
+            return channels;
+        }
+
+        /**
+         * @brief Get buffer bit depth
+         * @return The buffer's bit depth
+         */
+        ALint bitDepth() {
+            ALint bitDepth;
+            alGetBufferi(_id, AL_BITS, &bitDepth);
+            return bitDepth;
+        }
+
+        /**
+         * @brief Get buffer length
+         * @return The buffer's length in samples
+         */
+        ALint length() {
+            return size() * 8 / (channels() * bitDepth());
+        }
+
     private:
         ALuint _id;
 };

src/Magnum/Audio/Test/BufferALTest.cpp

@@ -3,6 +3,7 @@
 
     Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019
               Vladimír Vondruš <mosra@centrum.cz>
+    Copyright © 2019 Guillaume Jacquemin <williamjcm@users.noreply.github.com>
 
     Permission is hereby granted, free of charge, to any person obtaining a
     copy of this software and associated documentation files (the "Software"),
@@ -26,6 +27,7 @@
 #include <Corrade/TestSuite/Tester.h>
 
 #include "Magnum/Audio/Buffer.h"
+#include "Magnum/Audio/BufferFormat.h"
 #include "Magnum/Audio/Context.h"
 
 namespace Magnum { namespace Audio { namespace Test { namespace {
@@ -35,11 +37,15 @@ struct BufferALTest: TestSuite::Tester {
 
     void construct();
 
+    void properties();
+
     Context _context;
 };
 
 BufferALTest::BufferALTest() {
-    addTests({&BufferALTest::construct});
+    addTests({&BufferALTest::construct,
+
+              &BufferALTest::properties});
 }
 
 void BufferALTest::construct() {
@@ -47,6 +53,18 @@ void BufferALTest::construct() {
     CORRADE_VERIFY(buf.id() != 0);
 }
 
+void BufferALTest::properties() {
+    Buffer buf;
+    constexpr char data[] { 25, 17, 24, 122, 67, 24, 48, 96 };
+
+    buf.setData(BufferFormat::Mono8, data, 22050);
+
+    CORRADE_COMPARE(buf.size(), 8);
+    CORRADE_COMPARE(buf.channels(), 1);
+    CORRADE_COMPARE(buf.bitDepth(), 8);
+    CORRADE_COMPARE(buf.length(), 8);
+}
+
 }}}}
 
 CORRADE_TEST_MAIN(Magnum::Audio::Test::BufferALTest)