blob: d1df6a3ca9b083bca2d7895127c240a08a4db8bf [file] [log] [blame]
// Copyright (c) 2012 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/seekable_buffer.h"
#include <stddef.h>
#include <stdint.h>
#include <cstdlib>
#include "base/cxx17_backports.h"
#include "base/time/time.h"
#include "media/base/data_buffer.h"
#include "media/base/timestamp_constants.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace media {
class SeekableBufferTest : public testing::Test {
public:
SeekableBufferTest() : buffer_(kBufferSize, kBufferSize) {
}
protected:
static const int kDataSize = 409600;
static const int kBufferSize = 4096;
static const int kWriteSize = 512;
void SetUp() override {
// Note: We use srand() and rand() rather than base::RandXXX() to improve
// unit test performance. We don't need good random numbers, just
// something that generates "mixed data."
const unsigned int kKnownSeed = 0x98765432;
srand(kKnownSeed);
// Create random test data samples.
for (int i = 0; i < kDataSize; i++)
data_[i] = static_cast<char>(rand());
}
int GetRandomInt(int maximum) {
return rand() % (maximum + 1);
}
SeekableBuffer buffer_;
uint8_t data_[kDataSize];
uint8_t write_buffer_[kDataSize];
};
TEST_F(SeekableBufferTest, RandomReadWrite) {
int write_position = 0;
int read_position = 0;
while (read_position < kDataSize) {
// Write a random amount of data.
int write_size = GetRandomInt(kBufferSize);
write_size = std::min(write_size, kDataSize - write_position);
bool should_append = buffer_.Append(data_ + write_position, write_size);
write_position += write_size;
EXPECT_GE(write_position, read_position);
EXPECT_EQ(write_position - read_position, buffer_.forward_bytes());
EXPECT_EQ(should_append, buffer_.forward_bytes() < kBufferSize)
<< "Incorrect buffer full reported";
// Peek a random amount of data.
int copy_size = GetRandomInt(kBufferSize);
int bytes_copied = buffer_.Peek(write_buffer_, copy_size);
EXPECT_GE(copy_size, bytes_copied);
EXPECT_EQ(0, memcmp(write_buffer_, data_ + read_position, bytes_copied));
// Read a random amount of data.
int read_size = GetRandomInt(kBufferSize);
int bytes_read = buffer_.Read(write_buffer_, read_size);
EXPECT_GE(read_size, bytes_read);
EXPECT_EQ(0, memcmp(write_buffer_, data_ + read_position, bytes_read));
read_position += bytes_read;
EXPECT_GE(write_position, read_position);
EXPECT_EQ(write_position - read_position, buffer_.forward_bytes());
}
}
TEST_F(SeekableBufferTest, ReadWriteSeek) {
const int kReadSize = kWriteSize / 4;
for (int i = 0; i < 10; ++i) {
// Write until buffer is full.
for (int j = 0; j < kBufferSize; j += kWriteSize) {
bool should_append = buffer_.Append(data_ + j, kWriteSize);
EXPECT_EQ(j < kBufferSize - kWriteSize, should_append)
<< "Incorrect buffer full reported";
EXPECT_EQ(j + kWriteSize, buffer_.forward_bytes());
}
// Simulate a read and seek pattern. Each loop reads 4 times, each time
// reading a quarter of |kWriteSize|.
int read_position = 0;
int forward_bytes = kBufferSize;
for (int j = 0; j < kBufferSize; j += kWriteSize) {
// Read.
EXPECT_EQ(kReadSize, buffer_.Read(write_buffer_, kReadSize));
forward_bytes -= kReadSize;
EXPECT_EQ(forward_bytes, buffer_.forward_bytes());
EXPECT_EQ(0, memcmp(write_buffer_, data_ + read_position, kReadSize));
read_position += kReadSize;
// Seek forward.
EXPECT_TRUE(buffer_.Seek(2 * kReadSize));
forward_bytes -= 2 * kReadSize;
read_position += 2 * kReadSize;
EXPECT_EQ(forward_bytes, buffer_.forward_bytes());
// Copy.
EXPECT_EQ(kReadSize, buffer_.Peek(write_buffer_, kReadSize));
EXPECT_EQ(forward_bytes, buffer_.forward_bytes());
EXPECT_EQ(0, memcmp(write_buffer_, data_ + read_position, kReadSize));
// Read.
EXPECT_EQ(kReadSize, buffer_.Read(write_buffer_, kReadSize));
forward_bytes -= kReadSize;
EXPECT_EQ(forward_bytes, buffer_.forward_bytes());
EXPECT_EQ(0, memcmp(write_buffer_, data_ + read_position, kReadSize));
read_position += kReadSize;
// Seek backward.
EXPECT_TRUE(buffer_.Seek(-3 * static_cast<int32_t>(kReadSize)));
forward_bytes += 3 * kReadSize;
read_position -= 3 * kReadSize;
EXPECT_EQ(forward_bytes, buffer_.forward_bytes());
// Copy.
EXPECT_EQ(kReadSize, buffer_.Peek(write_buffer_, kReadSize));
EXPECT_EQ(forward_bytes, buffer_.forward_bytes());
EXPECT_EQ(0, memcmp(write_buffer_, data_ + read_position, kReadSize));
// Read.
EXPECT_EQ(kReadSize, buffer_.Read(write_buffer_, kReadSize));
forward_bytes -= kReadSize;
EXPECT_EQ(forward_bytes, buffer_.forward_bytes());
EXPECT_EQ(0, memcmp(write_buffer_, data_ + read_position, kReadSize));
read_position += kReadSize;
// Copy.
EXPECT_EQ(kReadSize, buffer_.Peek(write_buffer_, kReadSize));
EXPECT_EQ(forward_bytes, buffer_.forward_bytes());
EXPECT_EQ(0, memcmp(write_buffer_, data_ + read_position, kReadSize));
// Read.
EXPECT_EQ(kReadSize, buffer_.Read(write_buffer_, kReadSize));
forward_bytes -= kReadSize;
EXPECT_EQ(forward_bytes, buffer_.forward_bytes());
EXPECT_EQ(0, memcmp(write_buffer_, data_ + read_position, kReadSize));
read_position += kReadSize;
// Seek forward.
EXPECT_TRUE(buffer_.Seek(kReadSize));
forward_bytes -= kReadSize;
read_position += kReadSize;
EXPECT_EQ(forward_bytes, buffer_.forward_bytes());
}
}
}
TEST_F(SeekableBufferTest, BufferFull) {
const int kMaxWriteSize = 2 * kBufferSize;
// Write and expect the buffer to be not full.
for (int i = 0; i < kBufferSize - kWriteSize; i += kWriteSize) {
EXPECT_TRUE(buffer_.Append(data_ + i, kWriteSize));
EXPECT_EQ(i + kWriteSize, buffer_.forward_bytes());
}
// Write until we have kMaxWriteSize bytes in the buffer. Buffer is full in
// these writes.
for (int i = buffer_.forward_bytes(); i < kMaxWriteSize; i += kWriteSize) {
EXPECT_FALSE(buffer_.Append(data_ + i, kWriteSize));
EXPECT_EQ(i + kWriteSize, buffer_.forward_bytes());
}
// Read until the buffer is empty.
int read_position = 0;
while (buffer_.forward_bytes()) {
// Read a random amount of data.
int read_size = GetRandomInt(kBufferSize);
int forward_bytes = buffer_.forward_bytes();
int bytes_read = buffer_.Read(write_buffer_, read_size);
EXPECT_EQ(0, memcmp(write_buffer_, data_ + read_position, bytes_read));
if (read_size > forward_bytes)
EXPECT_EQ(forward_bytes, bytes_read);
else
EXPECT_EQ(read_size, bytes_read);
read_position += bytes_read;
EXPECT_GE(kMaxWriteSize, read_position);
EXPECT_EQ(kMaxWriteSize - read_position, buffer_.forward_bytes());
}
// Expects we have no bytes left.
EXPECT_EQ(0, buffer_.forward_bytes());
EXPECT_EQ(0, buffer_.Read(write_buffer_, 1));
}
TEST_F(SeekableBufferTest, SeekBackward) {
EXPECT_EQ(0, buffer_.forward_bytes());
EXPECT_EQ(0, buffer_.backward_bytes());
EXPECT_FALSE(buffer_.Seek(1));
EXPECT_FALSE(buffer_.Seek(-1));
const int kReadSize = 256;
// Write into buffer until it's full.
for (int i = 0; i < kBufferSize; i += kWriteSize) {
// Write a random amount of data.
buffer_.Append(data_ + i, kWriteSize);
}
// Read until buffer is empty.
for (int i = 0; i < kBufferSize; i += kReadSize) {
EXPECT_EQ(kReadSize, buffer_.Read(write_buffer_, kReadSize));
EXPECT_EQ(0, memcmp(write_buffer_, data_ + i, kReadSize));
}
// Seek backward.
EXPECT_TRUE(buffer_.Seek(-static_cast<int32_t>(kBufferSize)));
EXPECT_FALSE(buffer_.Seek(-1));
// Read again.
for (int i = 0; i < kBufferSize; i += kReadSize) {
EXPECT_EQ(kReadSize, buffer_.Read(write_buffer_, kReadSize));
EXPECT_EQ(0, memcmp(write_buffer_, data_ + i, kReadSize));
}
}
TEST_F(SeekableBufferTest, GetCurrentChunk) {
const int kSeekSize = kWriteSize / 3;
scoped_refptr<DataBuffer> buffer = DataBuffer::CopyFrom(data_, kWriteSize);
const uint8_t* data;
int size;
EXPECT_FALSE(buffer_.GetCurrentChunk(&data, &size));
buffer_.Append(buffer.get());
EXPECT_TRUE(buffer_.GetCurrentChunk(&data, &size));
EXPECT_EQ(data, buffer->data());
EXPECT_EQ(size, buffer->data_size());
buffer_.Seek(kSeekSize);
EXPECT_TRUE(buffer_.GetCurrentChunk(&data, &size));
EXPECT_EQ(data, buffer->data() + kSeekSize);
EXPECT_EQ(size, buffer->data_size() - kSeekSize);
}
TEST_F(SeekableBufferTest, SeekForward) {
int write_position = 0;
int read_position = 0;
while (read_position < kDataSize) {
for (int i = 0; i < 10 && write_position < kDataSize; ++i) {
// Write a random amount of data.
int write_size = GetRandomInt(kBufferSize);
write_size = std::min(write_size, kDataSize - write_position);
bool should_append = buffer_.Append(data_ + write_position, write_size);
write_position += write_size;
EXPECT_GE(write_position, read_position);
EXPECT_EQ(write_position - read_position, buffer_.forward_bytes());
EXPECT_EQ(should_append, buffer_.forward_bytes() < kBufferSize)
<< "Incorrect buffer full status reported";
}
// Read a random amount of data.
int seek_size = GetRandomInt(kBufferSize);
if (buffer_.Seek(seek_size))
read_position += seek_size;
EXPECT_GE(write_position, read_position);
EXPECT_EQ(write_position - read_position, buffer_.forward_bytes());
// Read a random amount of data.
int read_size = GetRandomInt(kBufferSize);
int bytes_read = buffer_.Read(write_buffer_, read_size);
EXPECT_GE(read_size, bytes_read);
EXPECT_EQ(0, memcmp(write_buffer_, data_ + read_position, bytes_read));
read_position += bytes_read;
EXPECT_GE(write_position, read_position);
EXPECT_EQ(write_position - read_position, buffer_.forward_bytes());
}
}
TEST_F(SeekableBufferTest, AllMethods) {
EXPECT_EQ(0, buffer_.Read(write_buffer_, 0));
EXPECT_EQ(0, buffer_.Read(write_buffer_, 1));
EXPECT_TRUE(buffer_.Seek(0));
EXPECT_FALSE(buffer_.Seek(-1));
EXPECT_FALSE(buffer_.Seek(1));
EXPECT_EQ(0, buffer_.forward_bytes());
EXPECT_EQ(0, buffer_.backward_bytes());
}
TEST_F(SeekableBufferTest, GetTime) {
const int64_t kNoTS = kNoTimestamp.ToInternalValue();
const struct {
int64_t first_time_useconds;
int64_t duration_useconds;
int consume_bytes;
int64_t expected_time;
} tests[] = {
{ kNoTS, 1000000, 0, kNoTS },
{ kNoTS, 4000000, 0, kNoTS },
{ kNoTS, 8000000, 0, kNoTS },
{ kNoTS, 1000000, kWriteSize / 2, kNoTS },
{ kNoTS, 4000000, kWriteSize / 2, kNoTS },
{ kNoTS, 8000000, kWriteSize / 2, kNoTS },
{ kNoTS, 1000000, kWriteSize, kNoTS },
{ kNoTS, 4000000, kWriteSize, kNoTS },
{ kNoTS, 8000000, kWriteSize, kNoTS },
{ 0, 1000000, 0, 0 },
{ 0, 4000000, 0, 0 },
{ 0, 8000000, 0, 0 },
{ 0, 1000000, kWriteSize / 2, 500000 },
{ 0, 4000000, kWriteSize / 2, 2000000 },
{ 0, 8000000, kWriteSize / 2, 4000000 },
{ 0, 1000000, kWriteSize, 1000000 },
{ 0, 4000000, kWriteSize, 4000000 },
{ 0, 8000000, kWriteSize, 8000000 },
{ 5, 1000000, 0, 5 },
{ 5, 4000000, 0, 5 },
{ 5, 8000000, 0, 5 },
{ 5, 1000000, kWriteSize / 2, 500005 },
{ 5, 4000000, kWriteSize / 2, 2000005 },
{ 5, 8000000, kWriteSize / 2, 4000005 },
{ 5, 1000000, kWriteSize, 1000005 },
{ 5, 4000000, kWriteSize, 4000005 },
{ 5, 8000000, kWriteSize, 8000005 },
};
// current_time() must initially return kNoTimestamp.
EXPECT_EQ(kNoTimestamp.ToInternalValue(),
buffer_.current_time().ToInternalValue());
scoped_refptr<DataBuffer> buffer = DataBuffer::CopyFrom(data_, kWriteSize);
for (size_t i = 0; i < base::size(tests); ++i) {
buffer->set_timestamp(base::Microseconds(tests[i].first_time_useconds));
buffer->set_duration(base::Microseconds(tests[i].duration_useconds));
buffer_.Append(buffer.get());
EXPECT_TRUE(buffer_.Seek(tests[i].consume_bytes));
int64_t actual = buffer_.current_time().ToInternalValue();
EXPECT_EQ(tests[i].expected_time, actual) << "With test = { start:"
<< tests[i].first_time_useconds << ", duration:"
<< tests[i].duration_useconds << ", consumed:"
<< tests[i].consume_bytes << " }\n";
buffer_.Clear();
}
}
} // namespace media