media/base/audio_pull_fifo_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/bind.h"
   6 #include "base/bind_helpers.h"
   7 #include "base/strings/stringprintf.h"
   8 #include "media/base/audio_bus.h"
   9 #include "media/base/audio_pull_fifo.h"
  10 #include "testing/gtest/include/gtest/gtest.h"
  11
  12 namespace media {
  13
  14 // Block diagram of a possible real-world usage:
  15 //
  16 //       | Producer | ----> | AudioPullFifo | ----> | Consumer |
  17 //                    push                    pull
  18 //          2048      ---->       (2048)      ---->     ~512
  19
  20 // Number of channels in each audio bus.
  21 static int kChannels = 2;
  22
  23 // Max number of audio framed the FIFO can contain.
  24 static const int kMaxFramesInFifo = 2048;
  25
  26 class AudioPullFifoTest
  27     : public testing::TestWithParam<int> {
  28  public:
  29   AudioPullFifoTest()
  30     : pull_fifo_(kChannels, kMaxFramesInFifo, base::Bind(
  31           &AudioPullFifoTest::ProvideInput, base::Unretained(this))),
  32       audio_bus_(AudioBus::Create(kChannels, kMaxFramesInFifo)),
  33       fill_value_(0),
  34       last_frame_delay_(-1) {}
  35   virtual ~AudioPullFifoTest() {}
  36
  37   void VerifyValue(const float data[], int size, float start_value) {
  38     float value = start_value;
  39     for (int i = 0; i < size; ++i) {
  40       ASSERT_FLOAT_EQ(value++, data[i]) << "i=" << i;
  41     }
  42   }
  43
  44   // Consume data using different sizes, acquire audio frames from the FIFO
  45   // and verify that the retrieved values matches the values written by the
  46   // producer.
  47   void ConsumeTest(int frames_to_consume) {
  48     int start_value = 0;
  49     SCOPED_TRACE(base::StringPrintf("Checking frames_to_consume %d",
  50                  frames_to_consume));
  51     pull_fifo_.Consume(audio_bus_.get(), frames_to_consume);
  52     for (int j = 0; j < kChannels; ++j) {
  53       VerifyValue(audio_bus_->channel(j), frames_to_consume, start_value);
  54     }
  55     start_value += frames_to_consume;
  56     EXPECT_LT(last_frame_delay_, audio_bus_->frames());
  57   }
  58
  59   // AudioPullFifo::ReadCB implementation where we increase a value for each
  60   // audio frame that we provide. Note that all channels are given the same
  61   // value to simplify the verification.
  62   virtual void ProvideInput(int frame_delay, AudioBus* audio_bus) {
  63     ASSERT_GT(frame_delay, last_frame_delay_);
  64     last_frame_delay_ = frame_delay;
  65
  66     EXPECT_EQ(audio_bus->channels(), audio_bus_->channels());
  67     EXPECT_EQ(audio_bus->frames(), kMaxFramesInFifo);
  68     for (int i = 0; i < audio_bus->frames(); ++i) {
  69       for (int j = 0; j < audio_bus->channels(); ++j) {
  70         // Store same value in all channels.
  71         audio_bus->channel(j)[i] = fill_value_;
  72       }
  73       fill_value_++;
  74     }
  75   }
  76
  77  protected:
  78   AudioPullFifo pull_fifo_;
  79   scoped_ptr<AudioBus> audio_bus_;
  80   int fill_value_;
  81   int last_frame_delay_;
  82
  83   DISALLOW_COPY_AND_ASSIGN(AudioPullFifoTest);
  84 };
  85
  86 TEST_P(AudioPullFifoTest, Consume) {
  87   ConsumeTest(GetParam());
  88 }
  89
  90 // Test common |frames_to_consume| values which will be used as input
  91 // parameter to AudioPullFifo::Consume() when the consumer asks for data.
  92 INSTANTIATE_TEST_CASE_P(
  93     AudioPullFifoTest, AudioPullFifoTest,
  94     testing::Values(544, 512, 512, 512, 512, 2048, 544, 441, 440, 433, 500));
  95
  96 }  // namespace media