Mixing audio with different latency requirements

media/base/audio_latency_unittest.cc

+// Copyright 2016 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_latency.h"
+
+#include <stdint.h>
+
+#include "base/logging.h"
+#include "build/build_config.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media {
+
+TEST(AudioLatency, HighLatencyBufferSizes) {
+#if defined(OS_WIN)
+  for (int i = 6400; i <= 204800; i *= 2)

[henrika (OOO until Aug 14), 2016/06/28 13:33:13]

I don't know where this set of sample rate comes from. Not used in real life on
any platform AFAIK.

[o1ka, 2016/06/29 10:11:26]

This is moved from AudioHardwareConfig unit tests. I don't think it's really
important to have all the real values here, it's more for math checking. Agree
that the tests can be extended/improved with real-world sample rate usage. Added
TODO.

+    EXPECT_EQ(2 * (i / 100),
+              AudioLatency::GetHighLatencyBufferSize(i, i / 100));
+#else
+  for (int i = 6400; i <= 204800; i *= 2)
+    EXPECT_EQ(2 * (i / 100), AudioLatency::GetHighLatencyBufferSize(i, 32));
+#endif  // defined(OS_WIN)
+}
+
+TEST(AudioLatency, InteractiveBufferSizes) {
+#if defined(OS_ANDROID)
+  for (int i = 6400; i < 102400; i *= 2)
+    EXPECT_EQ(2048, AudioLatency::GetInteractiveBufferSize(i / 100));
+  for (; i <= 204800; i *= 2)
+    EXPECT_EQ(i / 100, AudioLatency::GetInteractiveBufferSize(i / 100));
+#else
+  for (int i = 6400; i <= 204800; i *= 2)
+    EXPECT_EQ(i / 100, AudioLatency::GetInteractiveBufferSize(i / 100));
+#endif  // defined(OS_ANDROID)
+}
+
+TEST(AudioLatency, RtcBufferSizes) {
+  for (int i = 6400; i < 204800; i *= 2) {
+    EXPECT_EQ(i / 100, AudioLatency::GetRtcBufferSize(i, 0));
+#if defined(OS_WIN)
+    EXPECT_EQ(500, AudioLatency::GetRtcBufferSize(i, 500));
+#elif defined(OS_ANDROID)
+    EXPECT_EQ(i / 50, AudioLatency::GetRtcBufferSize(i, i / 50 - 1));
+    EXPECT_EQ(i / 50 + 1, AudioLatency::GetRtcBufferSize(i, i / 50 + 1));
+#else
+    EXPECT_EQ(i / 100, AudioLatency::GetRtcBufferSize(i, 500));
+#endif  // defined(OS_WIN)
+  }
+}
+}  // namespace media