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// Copyright 2013 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/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "media/base/audio_buffer.h"
#include "media/base/audio_bus.h"
#include "media/base/test_helpers.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace media {
static void VerifyResult(float* channel_data,
int frames,
float start,
float increment) {
for (int i = 0; i < frames; ++i) {
SCOPED_TRACE(base::StringPrintf(
"i=%d/%d start=%f, increment=%f", i, frames, start, increment));
ASSERT_EQ(channel_data[i], start);
start += increment;
}
}
TEST(AudioBufferTest, CopyFrom) {
const int channels = 1;
const int frames = 8;
const base::TimeDelta start_time;
const base::TimeDelta duration = base::TimeDelta::FromSeconds(frames);
scoped_refptr<AudioBuffer> buffer = MakeInterleavedAudioBuffer<uint8>(
kSampleFormatU8, channels, 1, 1, frames, start_time, duration);
EXPECT_EQ(frames, buffer->frame_count());
EXPECT_EQ(buffer->timestamp(), start_time);
EXPECT_EQ(buffer->duration().InSeconds(), frames);
EXPECT_FALSE(buffer->end_of_stream());
}
TEST(AudioBufferTest, CreateEOSBuffer) {
scoped_refptr<AudioBuffer> buffer = AudioBuffer::CreateEOSBuffer();
EXPECT_TRUE(buffer->end_of_stream());
}
TEST(AudioBufferTest, FrameSize) {
const uint8 kTestData[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
27, 28, 29, 30, 31 };
const base::TimeDelta kTimestampA = base::TimeDelta::FromMicroseconds(1337);
const base::TimeDelta kTimestampB = base::TimeDelta::FromMicroseconds(1234);
const uint8* const data[] = { kTestData };
scoped_refptr<AudioBuffer> buffer = AudioBuffer::CopyFrom(
kSampleFormatU8, 2, 16, data, kTimestampA, kTimestampB);
EXPECT_EQ(16, buffer->frame_count()); // 2 channels of 8-bit data
buffer = AudioBuffer::CopyFrom(
kSampleFormatF32, 4, 2, data, kTimestampA, kTimestampB);
EXPECT_EQ(2, buffer->frame_count()); // now 4 channels of 32-bit data
}
TEST(AudioBufferTest, ReadU8) {
const int channels = 4;
const int frames = 4;
const base::TimeDelta start_time;
const base::TimeDelta duration = base::TimeDelta::FromSeconds(frames);
scoped_refptr<AudioBuffer> buffer = MakeInterleavedAudioBuffer<uint8>(
kSampleFormatU8, channels, 128, 1, frames, start_time, duration);
// Read all 4 frames from the buffer. Data is interleaved, so ch[0] should be
// 128, 132, 136, 140, other channels similar. However, values are converted
// from [0, 255] to [-1.0, 1.0] with a bias of 128. Thus the first buffer
// value should be 0.0, then 1/127, 2/127, etc.
scoped_ptr<AudioBus> bus = AudioBus::Create(channels, 100);
buffer->ReadFrames(frames, 0, 0, bus.get());
VerifyResult(bus->channel(0), frames, 0.0f, 4.0f / 127.0f);
VerifyResult(bus->channel(1), frames, 1.0f / 127.0f, 4.0f / 127.0f);
VerifyResult(bus->channel(2), frames, 2.0f / 127.0f, 4.0f / 127.0f);
VerifyResult(bus->channel(3), frames, 3.0f / 127.0f, 4.0f / 127.0f);
}
TEST(AudioBufferTest, ReadS16) {
const int channels = 2;
const int frames = 10;
const base::TimeDelta start_time;
const base::TimeDelta duration = base::TimeDelta::FromSeconds(frames);
scoped_refptr<AudioBuffer> buffer = MakeInterleavedAudioBuffer<int16>(
kSampleFormatS16, channels, 1, 1, frames, start_time, duration);
// Read 6 frames from the buffer. Data is interleaved, so ch[0] should be 1,
// 3, 5, 7, 9, 11, and ch[1] should be 2, 4, 6, 8, 10, 12. Data is converted
// to float from -1.0 to 1.0 based on int16 range.
scoped_ptr<AudioBus> bus = AudioBus::Create(channels, 100);
buffer->ReadFrames(6, 0, 0, bus.get());
VerifyResult(bus->channel(0), 6, 1.0f / kint16max, 2.0f / kint16max);
VerifyResult(bus->channel(1), 6, 2.0f / kint16max, 2.0f / kint16max);
// Now read the same data one frame at a time.
bus = AudioBus::Create(channels, 100);
for (int i = 0; i < frames; ++i) {
buffer->ReadFrames(1, i, i, bus.get());
}
VerifyResult(bus->channel(0), frames, 1.0f / kint16max, 2.0f / kint16max);
VerifyResult(bus->channel(1), frames, 2.0f / kint16max, 2.0f / kint16max);
}
TEST(AudioBufferTest, ReadS32) {
const int channels = 2;
const int frames = 6;
const base::TimeDelta start_time;
const base::TimeDelta duration = base::TimeDelta::FromSeconds(frames);
scoped_refptr<AudioBuffer> buffer = MakeInterleavedAudioBuffer<int32>(
kSampleFormatS32, channels, 1, 1, frames, start_time, duration);
// Read 6 frames from the buffer. Data is interleaved, so ch[0] should be 1,
// 3, 5, 7, 9, 11, and ch[1] should be 2, 4, 6, 8, 10, 12. Data is converted
// to float from -1.0 to 1.0 based on int32 range.
scoped_ptr<AudioBus> bus = AudioBus::Create(channels, 100);
buffer->ReadFrames(frames, 0, 0, bus.get());
VerifyResult(bus->channel(0), frames, 1.0f / kint32max, 2.0f / kint32max);
VerifyResult(bus->channel(1), frames, 2.0f / kint32max, 2.0f / kint32max);
// Now read 2 frames starting at frame offset 3. ch[0] should be 7, 9, and
// ch[1] should be 8, 10.
buffer->ReadFrames(2, 3, 0, bus.get());
VerifyResult(bus->channel(0), 2, 7.0f / kint32max, 2.0f / kint32max);
VerifyResult(bus->channel(1), 2, 8.0f / kint32max, 2.0f / kint32max);
}
TEST(AudioBufferTest, ReadF32) {
const int channels = 2;
const int frames = 20;
const base::TimeDelta start_time;
const base::TimeDelta duration = base::TimeDelta::FromSeconds(frames);
scoped_refptr<AudioBuffer> buffer = MakeInterleavedAudioBuffer<float>(
kSampleFormatF32, channels, 1.0f, 1.0f, frames, start_time, duration);
// Read first 10 frames from the buffer. F32 is interleaved, so ch[0] should
// be 1, 3, 5, ... and ch[1] should be 2, 4, 6, ...
scoped_ptr<AudioBus> bus = AudioBus::Create(channels, 100);
buffer->ReadFrames(10, 0, 0, bus.get());
VerifyResult(bus->channel(0), 10, 1.0f, 2.0f);
VerifyResult(bus->channel(1), 10, 2.0f, 2.0f);
// Read second 10 frames.
bus = AudioBus::Create(channels, 100);
buffer->ReadFrames(10, 10, 0, bus.get());
VerifyResult(bus->channel(0), 10, 21.0f, 2.0f);
VerifyResult(bus->channel(1), 10, 22.0f, 2.0f);
}
TEST(AudioBufferTest, ReadS16Planar) {
const int channels = 2;
const int frames = 20;
const base::TimeDelta start_time;
const base::TimeDelta duration = base::TimeDelta::FromSeconds(frames);
scoped_refptr<AudioBuffer> buffer = MakePlanarAudioBuffer<int16>(
kSampleFormatPlanarS16, channels, 1, 1, frames, start_time, duration);
// Read 6 frames from the buffer. Data is planar, so ch[0] should be 1, 2, 3,
// 4, 5, 6, and ch[1] should be 21, 22, 23, 24, 25, 26. Data is converted to
// float from -1.0 to 1.0 based on int16 range.
scoped_ptr<AudioBus> bus = AudioBus::Create(channels, 100);
buffer->ReadFrames(6, 0, 0, bus.get());
VerifyResult(bus->channel(0), 6, 1.0f / kint16max, 1.0f / kint16max);
VerifyResult(bus->channel(1), 6, 21.0f / kint16max, 1.0f / kint16max);
// Read all the frames backwards, one by one. ch[0] should be 20, 19, ...
bus = AudioBus::Create(channels, 100);
for (int i = 0; i < frames; ++i) {
buffer->ReadFrames(1, frames - i - 1, i, bus.get());
}
VerifyResult(bus->channel(0), frames, 20.0f / kint16max, -1.0f / kint16max);
VerifyResult(bus->channel(1), frames, 40.0f / kint16max, -1.0f / kint16max);
// Read 0 frames with different offsets. Existing data in AudioBus should be
// unchanged.
buffer->ReadFrames(0, 0, 0, bus.get());
buffer->ReadFrames(0, 0, 10, bus.get());
buffer->ReadFrames(0, 10, 0, bus.get());
VerifyResult(bus->channel(0), frames, 20.0f / kint16max, -1.0f / kint16max);
VerifyResult(bus->channel(1), frames, 40.0f / kint16max, -1.0f / kint16max);
}
TEST(AudioBufferTest, ReadF32Planar) {
const int channels = 4;
const int frames = 100;
const base::TimeDelta start_time;
const base::TimeDelta duration = base::TimeDelta::FromSeconds(frames);
scoped_refptr<AudioBuffer> buffer =
MakePlanarAudioBuffer<float>(kSampleFormatPlanarF32,
channels,
1.0f,
1.0f,
frames,
start_time,
duration);
// Read all 100 frames from the buffer. F32 is planar, so ch[0] should be 1,
// 2, 3, 4, ..., ch[1] should be 101, 102, 103, ..., and so on for all 4
// channels.
scoped_ptr<AudioBus> bus = AudioBus::Create(channels, 100);
buffer->ReadFrames(frames, 0, 0, bus.get());
VerifyResult(bus->channel(0), frames, 1.0f, 1.0f);
VerifyResult(bus->channel(1), frames, 101.0f, 1.0f);
VerifyResult(bus->channel(2), frames, 201.0f, 1.0f);
VerifyResult(bus->channel(3), frames, 301.0f, 1.0f);
// Now read 20 frames from the middle of the buffer.
bus = AudioBus::Create(channels, 100);
buffer->ReadFrames(20, 50, 0, bus.get());
VerifyResult(bus->channel(0), 20, 51.0f, 1.0f);
VerifyResult(bus->channel(1), 20, 151.0f, 1.0f);
VerifyResult(bus->channel(2), 20, 251.0f, 1.0f);
VerifyResult(bus->channel(3), 20, 351.0f, 1.0f);
}
TEST(AudioBufferTest, EmptyBuffer) {
const int channels = 4;
const int frames = 100;
const base::TimeDelta start_time;
const base::TimeDelta duration = base::TimeDelta::FromSeconds(frames);
scoped_refptr<AudioBuffer> buffer = AudioBuffer::CreateEmptyBuffer(
channels, frames, start_time, duration);
EXPECT_EQ(frames, buffer->frame_count());
EXPECT_EQ(start_time, buffer->timestamp());
EXPECT_EQ(frames, buffer->duration().InSeconds());
EXPECT_FALSE(buffer->end_of_stream());
// Read all 100 frames from the buffer. All data should be 0.
scoped_ptr<AudioBus> bus = AudioBus::Create(channels, 100);
buffer->ReadFrames(frames, 0, 0, bus.get());
VerifyResult(bus->channel(0), frames, 0.0f, 0.0f);
VerifyResult(bus->channel(1), frames, 0.0f, 0.0f);
VerifyResult(bus->channel(2), frames, 0.0f, 0.0f);
VerifyResult(bus->channel(3), frames, 0.0f, 0.0f);
}
TEST(AudioBufferTest, Trim) {
const int channels = 4;
const int frames = 100;
const base::TimeDelta start_time;
const base::TimeDelta duration = base::TimeDelta::FromSeconds(frames);
scoped_refptr<AudioBuffer> buffer =
MakePlanarAudioBuffer<float>(kSampleFormatPlanarF32,
channels,
1.0f,
1.0f,
frames,
start_time,
duration);
EXPECT_EQ(frames, buffer->frame_count());
EXPECT_EQ(start_time, buffer->timestamp());
EXPECT_EQ(frames, buffer->duration().InSeconds());
scoped_ptr<AudioBus> bus = AudioBus::Create(channels, 100);
buffer->ReadFrames(20, 0, 0, bus.get());
VerifyResult(bus->channel(0), 20, 1.0f, 1.0f);
// Trim off 10 frames from the start.
buffer->TrimStart(10);
EXPECT_EQ(buffer->frame_count(), frames - 10);
EXPECT_EQ(buffer->timestamp(), start_time + base::TimeDelta::FromSeconds(10));
EXPECT_EQ(buffer->duration(), base::TimeDelta::FromSeconds(90));
buffer->ReadFrames(20, 0, 0, bus.get());
VerifyResult(bus->channel(0), 20, 11.0f, 1.0f);
// Trim off 10 frames from the end.
buffer->TrimEnd(10);
EXPECT_EQ(buffer->frame_count(), frames - 20);
EXPECT_EQ(buffer->timestamp(), start_time + base::TimeDelta::FromSeconds(10));
EXPECT_EQ(buffer->duration(), base::TimeDelta::FromSeconds(80));
buffer->ReadFrames(20, 0, 0, bus.get());
VerifyResult(bus->channel(0), 20, 11.0f, 1.0f);
// Trim off 50 more from the start.
buffer->TrimStart(50);
EXPECT_EQ(buffer->frame_count(), frames - 70);
EXPECT_EQ(buffer->timestamp(), start_time + base::TimeDelta::FromSeconds(60));
EXPECT_EQ(buffer->duration(), base::TimeDelta::FromSeconds(30));
buffer->ReadFrames(10, 0, 0, bus.get());
VerifyResult(bus->channel(0), 10, 61.0f, 1.0f);
// Trim off the last 30 frames.
buffer->TrimEnd(30);
EXPECT_EQ(buffer->frame_count(), 0);
EXPECT_EQ(buffer->timestamp(), start_time + base::TimeDelta::FromSeconds(60));
EXPECT_EQ(buffer->duration(), base::TimeDelta::FromSeconds(0));
}
} // namespace media
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