Adding second layer of the echo canceller 3 functionality.

webrtc/modules/audio_processing/aec3/render_delay_buffer_unittest.cc

+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.

[hlundin-webrtc, 2017/01/18 13:08:50]

2017

[peah-webrtc, 2017/01/19 15:33:06]

Done.

+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/modules/audio_processing/aec3/render_delay_buffer.h"
+
+#include <memory>
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include "webrtc/base/array_view.h"
+#include "webrtc/base/random.h"
+#include "webrtc/modules/audio_processing/aec3/aec3_constants.h"
+#include "webrtc/modules/audio_processing/logging/apm_data_dumper.h"
+#include "webrtc/test/gtest.h"
+
+namespace webrtc {
+namespace {
+
+std::string ProduceDebugText(int sample_rate_hz) {
+  std::ostringstream ss;
+  ss << "Sample rate: " << sample_rate_hz;
+  return ss.str();
+}
+
+std::string ProduceDebugText(int sample_rate_hz, size_t delay) {
+  std::ostringstream ss;
+  ss << "Sample rate: " << sample_rate_hz;
+  ss << ", Delay: " << delay;
+  return ss.str();
+}
+
+constexpr size_t kMaxApiCallJitter = 30;
+
+}  // namespace
+
+// Verifies that the basic swap in the insert call works.
+TEST(RenderDelayBuffer, InsertSwap) {
+  for (auto rate : {8000, 16000, 32000, 48000}) {
+    SCOPED_TRACE(ProduceDebugText(rate));
+    std::unique_ptr<RenderDelayBuffer> delay_buffer(RenderDelayBuffer::Create(
+        250, NumBandsForRate(rate), kMaxApiCallJitter));
+    for (size_t k = 0; k < 10; ++k) {
+      std::vector<std::vector<float>> block_to_insert(
+          NumBandsForRate(rate), std::vector<float>(kBlockSize, k + 1));
+      std::vector<std::vector<float>> reference_block = block_to_insert;
+
+      EXPECT_TRUE(delay_buffer->Insert(&block_to_insert));
+      EXPECT_NE(reference_block, block_to_insert);
+    }
+  }
+}
+
+// Verifies that the buffer passes the blocks in a bitexact manner when the
+// delay is zero.
+TEST(RenderDelayBuffer, BasicBitexactness) {
+  for (auto rate : {8000, 16000, 32000, 48000}) {
+    SCOPED_TRACE(ProduceDebugText(rate));
+    std::unique_ptr<RenderDelayBuffer> delay_buffer(RenderDelayBuffer::Create(
+        20, NumBandsForRate(rate), kMaxApiCallJitter));
+    for (size_t k = 0; k < 200; ++k) {
+      std::vector<std::vector<float>> block_to_insert(
+          NumBandsForRate(rate), std::vector<float>(kBlockSize, k));
+      std::vector<std::vector<float>> reference_block = block_to_insert;
+      EXPECT_TRUE(delay_buffer->Insert(&block_to_insert));
+      EXPECT_TRUE(delay_buffer->IsBlockAvailable());

[hlundin-webrtc, 2017/01/18 13:08:50]

ASSERT_TRUE. If this is not true, the GetNext method will DCHECK and kill the
test binary.

[peah-webrtc, 2017/01/19 15:33:06]

Good point!

Done.

+      const std::vector<std::vector<float>>& output_block =
+          delay_buffer->GetNext();
+      EXPECT_EQ(reference_block, output_block);
+    }
+  }
+}
+
+// Verifies that the buffer passes the blocks in a bitexact manner when the
+// delay is non-zero.
+TEST(RenderDelayBuffer, BitexactnessWithNonZeroDelay) {
+  constexpr size_t kMaxDelay = 200;
+  for (auto rate : {8000, 16000, 32000, 48000}) {
+    for (size_t delay = 0; delay < kMaxDelay; ++delay) {
+      SCOPED_TRACE(ProduceDebugText(rate, delay));
+      std::unique_ptr<RenderDelayBuffer> delay_buffer(RenderDelayBuffer::Create(
+          20 + kMaxDelay, NumBandsForRate(rate), kMaxApiCallJitter));
+      delay_buffer->SetDelay(delay);
+      for (size_t k = 0; k < 200 + delay; ++k) {
+        std::vector<std::vector<float>> block_to_insert(
+            NumBandsForRate(rate), std::vector<float>(kBlockSize, k));
+        EXPECT_TRUE(delay_buffer->Insert(&block_to_insert));
+        EXPECT_TRUE(delay_buffer->IsBlockAvailable());

[hlundin-webrtc, 2017/01/18 13:08:50]

ASSERT_TRUE

[peah-webrtc, 2017/01/19 15:33:06]

Done.

+        const std::vector<std::vector<float>>& output_block =
+            delay_buffer->GetNext();
+        if (k >= delay) {
+          std::vector<std::vector<float>> reference_block(
+              NumBandsForRate(rate), std::vector<float>(kBlockSize, k - delay));
+          EXPECT_EQ(reference_block, output_block);
+        }
+      }
+    }
+  }
+}
+
+// Verifies that the buffer passes the blocks in a bitexact manner when the
+// delay is zero and there is jitter in the Insert and GetNext calls.
+TEST(RenderDelayBuffer, BasicBitexactnessWithJitter) {
+  for (auto rate : {8000, 16000, 32000, 48000}) {
+    SCOPED_TRACE(ProduceDebugText(rate));
+    std::unique_ptr<RenderDelayBuffer> delay_buffer(RenderDelayBuffer::Create(
+        20, NumBandsForRate(rate), kMaxApiCallJitter));
+    for (size_t k = 0; k < kMaxApiCallJitter; ++k) {
+      std::vector<std::vector<float>> block_to_insert(
+          NumBandsForRate(rate), std::vector<float>(kBlockSize, k));
+      EXPECT_TRUE(delay_buffer->Insert(&block_to_insert));
+    }
+
+    for (size_t k = 0; k < kMaxApiCallJitter; ++k) {
+      std::vector<std::vector<float>> reference_block(
+          NumBandsForRate(rate), std::vector<float>(kBlockSize, k));
+      EXPECT_TRUE(delay_buffer->IsBlockAvailable());

[hlundin-webrtc, 2017/01/18 13:08:50]

ASSERT_TRUE

[peah-webrtc, 2017/01/19 15:33:06]

Done.

+      const std::vector<std::vector<float>>& output_block =
+          delay_buffer->GetNext();
+      EXPECT_EQ(reference_block, output_block);
+    }
+    EXPECT_FALSE(delay_buffer->IsBlockAvailable());
+  }
+}
+
+// Verifies that the buffer passes the blocks in a bitexact manner when the
+// delay is non-zero and there is jitter in the Insert and GetNext calls.
+TEST(RenderDelayBuffer, BitexactnessWithNonZeroDelayAndJitter) {
+  constexpr size_t kMaxDelay = 200;
+  for (auto rate : {8000, 16000, 32000, 48000}) {
+    for (size_t delay = 0; delay < kMaxDelay; ++delay) {
+      SCOPED_TRACE(ProduceDebugText(rate, delay));
+      std::unique_ptr<RenderDelayBuffer> delay_buffer(RenderDelayBuffer::Create(
+          20 + kMaxDelay, NumBandsForRate(rate), kMaxApiCallJitter));
+      delay_buffer->SetDelay(delay);
+      for (size_t j = 0; j < 10; ++j) {
+        for (size_t k = 0; k < kMaxApiCallJitter; ++k) {
+          const size_t block_value = k + j * kMaxApiCallJitter;
+          std::vector<std::vector<float>> block_to_insert(
+              NumBandsForRate(rate),
+              std::vector<float>(kBlockSize, block_value));
+          EXPECT_TRUE(delay_buffer->Insert(&block_to_insert));
+        }
+
+        for (size_t k = 0; k < kMaxApiCallJitter; ++k) {
+          EXPECT_TRUE(delay_buffer->IsBlockAvailable());

[hlundin-webrtc, 2017/01/18 13:08:50]

ASSERT_TRUE

[peah-webrtc, 2017/01/19 15:33:06]

Done.

+          const std::vector<std::vector<float>>& output_block =
+              delay_buffer->GetNext();
+          const size_t block_value = k + j * kMaxApiCallJitter;
+          if (block_value >= delay) {
+            std::vector<std::vector<float>> reference_block(
+                NumBandsForRate(rate),
+                std::vector<float>(kBlockSize, block_value - delay));
+            EXPECT_EQ(reference_block, output_block);
+          }
+        }
+      }
+    }
+  }
+}
+
+// Verifies that no blocks are lost when the buffer is overflowed.

[hlundin-webrtc, 2017/01/18 13:08:50]

The block that caused the overflow is still lost, right?

[peah-webrtc, 2017/01/19 15:33:06]

True, but that depends on how the this is handled by the caller. The block is
never inserted so it is actually not lost. I changed the comment to be more
clear on this though.

Done.

[hlundin-webrtc, 2017/01/20 09:31:44]

Got it. But then you should probably also check that the block you tried to
insert is not swapped out.

[peah-webrtc, 2017/01/23 14:16:39]

Done.

+TEST(RenderDelayBuffer, BufferOverflowBitexactness) {
+  for (auto rate : {8000, 16000, 32000, 48000}) {
+    SCOPED_TRACE(ProduceDebugText(rate));
+    std::unique_ptr<RenderDelayBuffer> delay_buffer(RenderDelayBuffer::Create(
+        20, NumBandsForRate(rate), kMaxApiCallJitter));
+    for (size_t k = 0; k < kMaxApiCallJitter; ++k) {
+      std::vector<std::vector<float>> block_to_insert(
+          NumBandsForRate(rate), std::vector<float>(kBlockSize, k));
+      EXPECT_TRUE(delay_buffer->Insert(&block_to_insert));
+    }
+
+    std::vector<std::vector<float>> block_to_insert(
+        NumBandsForRate(rate), std::vector<float>(kBlockSize, 31));

[hlundin-webrtc, 2017/01/18 13:08:50]

Why 31? Magic number...

[peah-webrtc, 2017/01/19 15:33:06]

Thanks!
Done.

+    EXPECT_FALSE(delay_buffer->Insert(&block_to_insert));
+
+    for (size_t k = 0; k < kMaxApiCallJitter; ++k) {
+      std::vector<std::vector<float>> reference_block(
+          NumBandsForRate(rate), std::vector<float>(kBlockSize, k));
+      EXPECT_TRUE(delay_buffer->IsBlockAvailable());

[hlundin-webrtc, 2017/01/18 13:08:50]

ASSERT_TRUE

[peah-webrtc, 2017/01/19 15:33:06]

Done.

+      const std::vector<std::vector<float>>& output_block =
+          delay_buffer->GetNext();
+      EXPECT_EQ(reference_block, output_block);
+    }
+    EXPECT_FALSE(delay_buffer->IsBlockAvailable());
+  }
+}
+
+// Verifies that the buffer overflow is correctly reported.
+TEST(RenderDelayBuffer, BufferOverflow) {
+  for (auto rate : {8000, 16000, 32000, 48000}) {
+    SCOPED_TRACE(ProduceDebugText(rate));
+    std::unique_ptr<RenderDelayBuffer> delay_buffer(RenderDelayBuffer::Create(
+        20, NumBandsForRate(rate), kMaxApiCallJitter));
+    std::vector<std::vector<float>> block_to_insert(
+        NumBandsForRate(rate), std::vector<float>(kBlockSize, 0.f));
+    for (size_t k = 0; k < kMaxApiCallJitter; ++k) {
+      EXPECT_TRUE(delay_buffer->Insert(&block_to_insert));
+    }
+    EXPECT_FALSE(delay_buffer->Insert(&block_to_insert));
+  }
+}
+
+// Verifies that the check for available block works..

[hlundin-webrtc, 2017/01/18 13:08:50]

Double ..

[peah-webrtc, 2017/01/19 15:33:06]

Done.

+TEST(RenderDelayBuffer, AvailableBlock) {
+  std::unique_ptr<RenderDelayBuffer> delay_buffer(
+      RenderDelayBuffer::Create(20, 1, kMaxApiCallJitter));

[hlundin-webrtc, 2017/01/18 13:08:50]

kNumBands = 1

[peah-webrtc, 2017/01/19 15:33:06]

Done.

+  EXPECT_FALSE(delay_buffer->IsBlockAvailable());
+  std::vector<std::vector<float>> input_block(
+      1, std::vector<float>(kBlockSize, 1.f));

[hlundin-webrtc, 2017/01/18 13:08:50]

kNumBands

[peah-webrtc, 2017/01/19 15:33:06]

Done.

+  EXPECT_TRUE(delay_buffer->Insert(&input_block));
+  EXPECT_TRUE(delay_buffer->IsBlockAvailable());

[hlundin-webrtc, 2017/01/18 13:08:50]

ASSERT_TRUE

[peah-webrtc, 2017/01/19 15:33:06]

Done.

+  delay_buffer->GetNext();
+  EXPECT_FALSE(delay_buffer->IsBlockAvailable());
+}
+
+// Verifies that the maximum delay is computed correctly

[hlundin-webrtc, 2017/01/18 13:08:50]

.

[peah-webrtc, 2017/01/19 15:33:06]

Done.

+TEST(RenderDelayBuffer, MaxDelay) {
+  for (size_t max_delay = 1; max_delay < 20; ++max_delay) {
+    std::unique_ptr<RenderDelayBuffer> delay_buffer(
+        RenderDelayBuffer::Create(max_delay, 1, kMaxApiCallJitter));
+    EXPECT_EQ(max_delay, delay_buffer->MaxDelay());
+  }
+}
+
+// Verifies the SetDelay method.
+TEST(RenderDelayBuffer, SetDelay) {
+  std::unique_ptr<RenderDelayBuffer> delay_buffer(
+      RenderDelayBuffer::Create(20, 1, kMaxApiCallJitter));
+  EXPECT_EQ(0u, delay_buffer->Delay());
+  for (size_t delay = 0; delay < 20; ++delay) {
+    delay_buffer->SetDelay(delay);
+    EXPECT_EQ(delay, delay_buffer->Delay());
+  }
+}
+
+#if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
+
+// Verifies the check for null insert.
+TEST(RenderDelayBuffer, NullPointerInInsert) {
+  std::unique_ptr<RenderDelayBuffer> delay_buffer(
+      RenderDelayBuffer::Create(20, 1, kMaxApiCallJitter));
+  EXPECT_DEATH(delay_buffer->Insert(nullptr), "");
+}
+
+// Verifies the check for feasible delay.
+TEST(RenderDelayBuffer, WrongDelay) {
+  std::unique_ptr<RenderDelayBuffer> delay_buffer(
+      RenderDelayBuffer::Create(20, 1, kMaxApiCallJitter));
+  EXPECT_DEATH(delay_buffer->SetDelay(21), "");
+}
+
+// Verifies the check for the number of bands in the inserted blocks.
+TEST(RenderDelayBuffer, WrongNumberOfBands) {
+  for (auto rate : {16000, 32000, 48000}) {
+    SCOPED_TRACE(ProduceDebugText(rate));
+    std::unique_ptr<RenderDelayBuffer> delay_buffer(RenderDelayBuffer::Create(
+        20, NumBandsForRate(rate), kMaxApiCallJitter));
+    std::vector<std::vector<float>> block_to_insert(
+        NumBandsForRate(rate < 48000 ? rate + 16000 : 16000),
+        std::vector<float>(kBlockSize, 0.f));
+    EXPECT_DEATH(delay_buffer->Insert(&block_to_insert), "");
+  }
+}
+
+// Verifies the check of the length of the inserted blocks.
+TEST(RenderDelayBuffer, WrongBlockLength) {
+  for (auto rate : {8000, 16000, 32000, 48000}) {
+    SCOPED_TRACE(ProduceDebugText(rate));
+    std::unique_ptr<RenderDelayBuffer> delay_buffer(RenderDelayBuffer::Create(
+        20, NumBandsForRate(rate), kMaxApiCallJitter));
+    std::vector<std::vector<float>> block_to_insert(
+        NumBandsForRate(rate), std::vector<float>(kBlockSize - 1, 0.f));
+    EXPECT_DEATH(delay_buffer->Insert(&block_to_insert), "");
+  }
+}
+
+// Verifies the behavior when getting a block from an empty buffer.
+TEST(RenderDelayBuffer, GetNextWithNoAvailableBlockVariant1) {
+  std::unique_ptr<RenderDelayBuffer> delay_buffer(
+      RenderDelayBuffer::Create(20, 1, kMaxApiCallJitter));
+  EXPECT_DEATH(delay_buffer->GetNext(), "");
+}
+
+// Verifies the behavior when getting a block from an empty buffer.
+TEST(RenderDelayBuffer, GetNextWithNoAvailableBlockVariant2) {
+  std::unique_ptr<RenderDelayBuffer> delay_buffer(
+      RenderDelayBuffer::Create(20, 1, kMaxApiCallJitter));
+  std::vector<std::vector<float>> input_block(
+      1, std::vector<float>(kBlockSize, 1.f));
+  EXPECT_TRUE(delay_buffer->Insert(&input_block));
+  delay_buffer->GetNext();
+  EXPECT_DEATH(delay_buffer->GetNext(), "");
+}
+
+#endif
+
+}  // namespace webrtc