AudioBus: Add a ToInterleavedFloat() method to AudioBus

media/base/audio_bus_unittest.cc

Index: media/base/audio_bus_unittest.cc
diff --git a/media/base/audio_bus_unittest.cc b/media/base/audio_bus_unittest.cc
index 02809db72379db083e913e5fe79b29a32a399e96..63b6405d9b2e53d1dbdd57452894bb34bf9cacfa 100644
--- a/media/base/audio_bus_unittest.cc
+++ b/media/base/audio_bus_unittest.cc
@@ -265,6 +265,9 @@ static const int32_t kTestVectorInt32[kTestVectorSize] = {
     INT32_MIN,     0, INT32_MAX, INT32_MIN, INT32_MAX / 2,
     INT32_MIN / 2, 0, INT32_MAX, 0,         0};
 
+static const float kTestVectorFloat[kTestVectorSize] = {
+    -1.0, 0.0, 1.0, -1.0, 0.5, -0.5, 0.0, 1.0, 0.0, 0.0};
+
 // Expected results.
 static const int kTestVectorFrames = kTestVectorSize / 2;
 static const float kTestVectorResult[][kTestVectorFrames] = {
@@ -375,6 +378,24 @@ TEST_F(AudioBusTest, ToInterleaved) {
   }
 }
 
+// Verify ToInterleavedFloat interleaves |AudioBus| channels of float
+// into a single linear output buffer correctly
+TEST_F(AudioBusTest, ToInterleavedFloat) {
+  SCOPED_TRACE("float");
+  scoped_ptr<AudioBus> bus =
+      AudioBus::Create(kTestVectorChannels, kTestVectorFrames);
+  for (int ch = 0; ch < bus->channels(); ++ch) {
+    memcpy(bus->channel(ch), kTestVectorResult[ch],
+           kTestVectorFrames * sizeof(*bus->channel(ch)));
+  }
+
+  float test_array[arraysize(kTestVectorFloat)];
+  bus->ToInterleavedFloat(0, 0, bus->frames(), test_array);
+  ASSERT_EQ(memcmp(test_array, kTestVectorFloat,
+                   kTestVectorFrames * sizeof(*kTestVectorFloat)),
+            0);
+}
+
 // Verify ToInterleavedPartial() interleaves audio correctly.
 TEST_F(AudioBusTest, ToInterleavedPartial) {
   // Only interleave the middle two frames in each channel.