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// 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 "base/memory/scoped_ptr.h"
#include "media/base/audio_buffer.h"
#include "media/base/audio_buffer_converter.h"
#include "media/base/sinc_resampler.h"
#include "media/base/test_helpers.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace media {
const int kOutSampleRate = 44100;
const ChannelLayout kOutChannelLayout = CHANNEL_LAYOUT_STEREO;
static scoped_refptr<AudioBuffer> MakeTestBuffer(int sample_rate,
ChannelLayout channel_layout,
int frames) {
return MakeAudioBuffer<uint8>(kSampleFormatU8,
channel_layout,
sample_rate,
0,
1,
frames,
base::TimeDelta::FromSeconds(0),
base::TimeDelta::FromSeconds(0));
}
class AudioBufferConverterTest : public ::testing::Test {
public:
AudioBufferConverterTest()
: input_frames_(0), expected_output_frames_(0.0), output_frames_(0) {
AudioParameters output_params(AudioParameters::AUDIO_PCM_LOW_LATENCY,
kOutChannelLayout,
kOutSampleRate,
16,
512);
audio_buffer_converter_.reset(new AudioBufferConverter(output_params));
}
void Reset() {
audio_buffer_converter_->Reset();
output_frames_ = expected_output_frames_ = input_frames_ = 0;
}
void AddInput(const scoped_refptr<AudioBuffer>& in) {
if (!in->end_of_stream()) {
input_frames_ += in->frame_count();
expected_output_frames_ +=
in->frame_count() *
(static_cast<double>(kOutSampleRate) / in->sample_rate());
}
audio_buffer_converter_->AddInput(in);
}
void ConsumeAllOutput() {
AddInput(AudioBuffer::CreateEOSBuffer());
while (audio_buffer_converter_->HasNextBuffer()) {
scoped_refptr<AudioBuffer> out = audio_buffer_converter_->GetNextBuffer();
if (!out->end_of_stream()) {
output_frames_ += out->frame_count();
EXPECT_EQ(out->sample_rate(), kOutSampleRate);
EXPECT_EQ(out->channel_layout(), kOutChannelLayout);
} else {
EXPECT_FALSE(audio_buffer_converter_->HasNextBuffer());
}
}
EXPECT_EQ(output_frames_, ceil(expected_output_frames_));
}
private:
scoped_ptr<AudioBufferConverter> audio_buffer_converter_;
int input_frames_;
double expected_output_frames_;
int output_frames_;
};
TEST_F(AudioBufferConverterTest, PassThrough) {
scoped_refptr<AudioBuffer> in =
MakeTestBuffer(kOutSampleRate, kOutChannelLayout, 512);
AddInput(in);
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, Downsample) {
scoped_refptr<AudioBuffer> in = MakeTestBuffer(48000, kOutChannelLayout, 512);
AddInput(in);
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, Upsample) {
scoped_refptr<AudioBuffer> in = MakeTestBuffer(8000, kOutChannelLayout, 512);
AddInput(in);
ConsumeAllOutput();
}
// Test resampling a buffer smaller than the SincResampler's kernel size.
TEST_F(AudioBufferConverterTest, Resample_TinyBuffer) {
AddInput(MakeTestBuffer(
48000, CHANNEL_LAYOUT_STEREO, SincResampler::kKernelSize - 1));
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, Resample_DifferingBufferSizes) {
const int input_sample_rate = 48000;
AddInput(MakeTestBuffer(input_sample_rate, kOutChannelLayout, 100));
AddInput(MakeTestBuffer(input_sample_rate, kOutChannelLayout, 200));
AddInput(MakeTestBuffer(input_sample_rate, kOutChannelLayout, 300));
AddInput(MakeTestBuffer(input_sample_rate, kOutChannelLayout, 400));
AddInput(MakeTestBuffer(input_sample_rate, kOutChannelLayout, 500));
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ChannelDownmix) {
scoped_refptr<AudioBuffer> in =
MakeTestBuffer(kOutSampleRate, CHANNEL_LAYOUT_MONO, 512);
AddInput(in);
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ChannelUpmix) {
scoped_refptr<AudioBuffer> in =
MakeTestBuffer(kOutSampleRate, CHANNEL_LAYOUT_5_1, 512);
AddInput(in);
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ResampleAndRemix) {
scoped_refptr<AudioBuffer> in =
MakeTestBuffer(48000, CHANNEL_LAYOUT_5_1, 512);
AddInput(in);
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ConfigChange_SampleRate) {
AddInput(MakeTestBuffer(48000, kOutChannelLayout, 512));
AddInput(MakeTestBuffer(44100, kOutChannelLayout, 512));
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ConfigChange_ChannelLayout) {
AddInput(MakeTestBuffer(kOutSampleRate, CHANNEL_LAYOUT_STEREO, 512));
AddInput(MakeTestBuffer(kOutSampleRate, CHANNEL_LAYOUT_MONO, 512));
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ConfigChange_SampleRateAndChannelLayout) {
AddInput(MakeTestBuffer(44100, CHANNEL_LAYOUT_STEREO, 512));
AddInput(MakeTestBuffer(48000, CHANNEL_LAYOUT_MONO, 512));
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ConfigChange_Multiple) {
AddInput(MakeTestBuffer(44100, CHANNEL_LAYOUT_STEREO, 512));
AddInput(MakeTestBuffer(48000, CHANNEL_LAYOUT_MONO, 512));
AddInput(MakeTestBuffer(44100, CHANNEL_LAYOUT_5_1, 512));
AddInput(MakeTestBuffer(22050, CHANNEL_LAYOUT_STEREO, 512));
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, Reset) {
AddInput(MakeTestBuffer(44100, CHANNEL_LAYOUT_STEREO, 512));
Reset();
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ResampleThenReset) {
// Resampling is likely to leave some data buffered in AudioConverter's
// fifo or resampler, so make sure Reset() cleans that all up.
AddInput(MakeTestBuffer(48000, CHANNEL_LAYOUT_STEREO, 512));
Reset();
ConsumeAllOutput();
}
TEST_F(AudioBufferConverterTest, ResetThenConvert) {
AddInput(MakeTestBuffer(kOutSampleRate, kOutChannelLayout, 512));
Reset();
// Make sure we can keep using the AudioBufferConverter after we've Reset().
AddInput(MakeTestBuffer(kOutSampleRate, kOutChannelLayout, 512));
ConsumeAllOutput();
}
} // namespace media
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