Add a block based Audio FIFO.

media/base/audio_block_fifo_unittest.cc

Index: media/base/audio_block_fifo_unittest.cc
diff --git a/media/base/audio_block_fifo_unittest.cc b/media/base/audio_block_fifo_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2ade6714b2f25c6b93ed37dda360f0ecb36eaba6
--- /dev/null
+++ b/media/base/audio_block_fifo_unittest.cc
@@ -0,0 +1,137 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "media/base/audio_block_fifo.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media {
+
+class AudioBlockFifoTest : public testing::Test {
+ public:
+  AudioBlockFifoTest() {}
+  virtual ~AudioBlockFifoTest() {}
+
+  void PushAndVerify(AudioBlockFifo* fifo, int frames_to_push,
+                     int channels, int block_frames, int max_frames) {
+    const int bytes_per_sample = 2;
+    const int data_byte_size = bytes_per_sample * channels * frames_to_push;
+    scoped_ptr<uint8[]> data(new uint8[data_byte_size]);
+    memset(data.get(), 0, data_byte_size);
+
+    for (int filled_frames =max_frames - fifo->empty_frames();
+         filled_frames + frames_to_push <= max_frames;) {
+      fifo->Push(data.get(), frames_to_push, bytes_per_sample);
+      filled_frames += frames_to_push;
+      EXPECT_EQ(fifo->empty_frames(), max_frames - filled_frames);
+      EXPECT_EQ(fifo->filled_blocks(),
+                static_cast<int>(filled_frames / block_frames));
+    }
+  }
+
+ protected:
+  DISALLOW_COPY_AND_ASSIGN(AudioBlockFifoTest);
+};
+
+// Verify that construction works as intended.
+TEST_F(AudioBlockFifoTest, Construct) {
+  static const int kChannels = 6;
+  static const int kFrames = 128;
+  static const int kBlocks = 4;
+  AudioBlockFifo fifo(kChannels, kFrames, kBlocks);
+  EXPECT_EQ(fifo.filled_blocks(), 0);
+  EXPECT_EQ(fifo.empty_frames(), kFrames * kBlocks);
+}
+
+// Pushes audio bus objects to/from a FIFO up to different degrees.
+TEST_F(AudioBlockFifoTest, Push) {
+  static const int kChannels = 2;
+  static const int kFrames = 128;
+  static const int kBlocks = 2;
+  AudioBlockFifo fifo(kChannels, kFrames, kBlocks);
+
+  // Push kFrames / 2 of data until FIFO is full.
+  PushAndVerify(&fifo, kFrames / 2, kChannels, kFrames, kFrames * kBlocks);
+  fifo.Clear();
+
+  // Push kFrames of data until FIFO is full.
+  PushAndVerify(&fifo, kFrames, kChannels, kFrames, kFrames * kBlocks);
+  fifo.Clear();
+
+  // Push 1.5 * kFrames of data.
+  PushAndVerify(&fifo, kFrames * 1.5, kChannels, kFrames, kFrames * kBlocks);
+  fifo.Clear();
+}
+
+// Perform a sequence of Push/Consume calls to different degrees, and verify
+// things are correct.
+TEST_F(AudioBlockFifoTest, PushAndConsume) {
+  static const int kChannels = 2;
+  static const int kFrames = 441;
+  static const int kBlocks = 4;
+  AudioBlockFifo fifo(kChannels, kFrames, kBlocks);
+  PushAndVerify(&fifo, kFrames, kChannels, kFrames, kFrames * kBlocks);
+  EXPECT_TRUE(fifo.empty_frames() == 0);
+  EXPECT_TRUE(fifo.filled_blocks() == kBlocks);
+
+  {
+    // Consume 1 block of data.
+    const AudioBus* bus = fifo.Consume();
+    EXPECT_TRUE(kChannels == bus->channels());
+    EXPECT_TRUE(kFrames == bus->frames());
+    EXPECT_TRUE(fifo.filled_blocks() == (kBlocks - 1));
+    EXPECT_TRUE(fifo.empty_frames() == kFrames);
+  }
+
+  {
+    // Fill it up again.
+    PushAndVerify(&fifo, kFrames, kChannels, kFrames, kFrames * kBlocks);
+    EXPECT_TRUE(fifo.empty_frames() == 0);
+    EXPECT_TRUE(fifo.filled_blocks() == kBlocks);
+
+    // Consume all blocks of data.
+    for (int i = 1; i <= kBlocks; ++i) {
+      const AudioBus* bus = fifo.Consume();
+      EXPECT_TRUE(kChannels == bus->channels());
+      EXPECT_TRUE(kFrames == bus->frames());
+      EXPECT_TRUE(fifo.empty_frames() == kFrames * i);
+      EXPECT_TRUE(fifo.filled_blocks() == (kBlocks - i));
+    }
+    EXPECT_TRUE(fifo.empty_frames() == kFrames * kBlocks);
+    EXPECT_TRUE(fifo.filled_blocks() == 0);
+  }
+
+  {
+    fifo.Clear();
+    int new_push_frames = 128;
+    // Change the input frame and try to fill up the FIFO.
+    PushAndVerify(&fifo, new_push_frames, kChannels, kFrames,
+                  kFrames * kBlocks);
+    EXPECT_TRUE(fifo.empty_frames() != 0);
+    EXPECT_TRUE(fifo.filled_blocks() == kBlocks -1);
+
+    // Consume all the existing filled blocks of data.
+    while (fifo.filled_blocks()) {
+      const AudioBus* bus = fifo.Consume();
+      EXPECT_TRUE(kChannels == bus->channels());
+      EXPECT_TRUE(kFrames == bus->frames());
+    }
+
+    // Since one block of FIFO has not been completely filled up, there should
+    // be remaining frames.
+    const int number_of_push =
+        static_cast<int>(kFrames * kBlocks / new_push_frames);
+    const int remain_frames = kFrames * kBlocks - fifo.empty_frames();
+    EXPECT_EQ(remain_frames,
+              number_of_push * new_push_frames - kFrames * (kBlocks - 1));
+
+    // Completely fill up the buffer again.
+    new_push_frames = kFrames * kBlocks - remain_frames;
+    PushAndVerify(&fifo, new_push_frames, kChannels, kFrames,
+                  kFrames * kBlocks);
+    EXPECT_TRUE(fifo.empty_frames() == 0);
+    EXPECT_TRUE(fifo.filled_blocks() == kBlocks);
+  }
+}
+
+}  // namespace media