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// Copyright (c) 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.
// Unit test for VideoCaptureBufferPool.
#include "content/browser/renderer_host/media/video_capture_buffer_pool.h"
#include "base/bind.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "content/browser/renderer_host/media/video_capture_controller.h"
#include "media/base/video_frame.h"
#include "media/base/video_util.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace content {
class VideoCaptureBufferPoolTest : public testing::Test {
protected:
class Buffer {
public:
Buffer(const scoped_refptr<VideoCaptureBufferPool> pool,
int id,
void* data,
size_t size)
: pool_(pool), id_(id), data_(data), size_(size) {}
~Buffer() { pool_->RelinquishProducerReservation(id()); }
int id() const { return id_; }
void* data() const { return data_; }
size_t size() const { return size_; }
private:
const scoped_refptr<VideoCaptureBufferPool> pool_;
const int id_;
void* const data_;
const size_t size_;
};
VideoCaptureBufferPoolTest()
: expected_dropped_id_(0),
pool_(new VideoCaptureBufferPool(3)) {}
void ExpectDroppedId(int expected_dropped_id) {
expected_dropped_id_ = expected_dropped_id;
}
scoped_ptr<Buffer> ReserveI420Buffer(const gfx::Size& dimensions) {
const size_t frame_bytes =
media::VideoFrame::AllocationSize(media::VideoFrame::I420, dimensions);
// To verify that ReserveI420Buffer always sets |buffer_id_to_drop|,
// initialize it to something different than the expected value.
int buffer_id_to_drop = ~expected_dropped_id_;
int buffer_id = pool_->ReserveForProducer(frame_bytes, &buffer_id_to_drop);
if (buffer_id == VideoCaptureBufferPool::kInvalidId)
return scoped_ptr<Buffer>();
void* memory;
size_t size;
pool_->GetBufferInfo(buffer_id, &memory, &size);
EXPECT_EQ(expected_dropped_id_, buffer_id_to_drop);
return scoped_ptr<Buffer>(new Buffer(pool_, buffer_id, memory, size));
}
int expected_dropped_id_;
scoped_refptr<VideoCaptureBufferPool> pool_;
private:
DISALLOW_COPY_AND_ASSIGN(VideoCaptureBufferPoolTest);
};
TEST_F(VideoCaptureBufferPoolTest, BufferPool) {
const gfx::Size size_lo = gfx::Size(640, 480);
const gfx::Size size_hi = gfx::Size(1024, 768);
scoped_refptr<media::VideoFrame> non_pool_frame =
media::VideoFrame::CreateFrame(media::VideoFrame::YV12, size_lo,
gfx::Rect(size_lo), size_lo,
base::TimeDelta());
// Reallocation won't happen for the first part of the test.
ExpectDroppedId(VideoCaptureBufferPool::kInvalidId);
scoped_ptr<Buffer> buffer1 = ReserveI420Buffer(size_lo);
ASSERT_TRUE(NULL != buffer1.get());
ASSERT_LE(media::VideoFrame::AllocationSize(media::VideoFrame::I420, size_lo),
buffer1->size());
scoped_ptr<Buffer> buffer2 = ReserveI420Buffer(size_lo);
ASSERT_TRUE(NULL != buffer2.get());
ASSERT_LE(media::VideoFrame::AllocationSize(media::VideoFrame::I420, size_lo),
buffer2->size());
scoped_ptr<Buffer> buffer3 = ReserveI420Buffer(size_lo);
ASSERT_TRUE(NULL != buffer3.get());
ASSERT_LE(media::VideoFrame::AllocationSize(media::VideoFrame::I420, size_lo),
buffer3->size());
// Touch the memory.
memset(buffer1->data(), 0x11, buffer1->size());
memset(buffer2->data(), 0x44, buffer2->size());
memset(buffer3->data(), 0x77, buffer3->size());
// Fourth buffer should fail.
ASSERT_FALSE(ReserveI420Buffer(size_lo)) << "Pool should be empty";
// Release 1st buffer and retry; this should succeed.
buffer1.reset();
scoped_ptr<Buffer> buffer4 = ReserveI420Buffer(size_lo);
ASSERT_TRUE(NULL != buffer4.get());
ASSERT_FALSE(ReserveI420Buffer(size_lo)) << "Pool should be empty";
ASSERT_FALSE(ReserveI420Buffer(size_hi)) << "Pool should be empty";
// Validate the IDs
int buffer_id2 = buffer2->id();
ASSERT_EQ(1, buffer_id2);
int buffer_id3 = buffer3->id();
ASSERT_EQ(2, buffer_id3);
void* const memory_pointer3 = buffer3->data();
int buffer_id4 = buffer4->id();
ASSERT_EQ(0, buffer_id4);
// Deliver a buffer.
pool_->HoldForConsumers(buffer_id3, 2);
ASSERT_FALSE(ReserveI420Buffer(size_lo)) << "Pool should be empty";
buffer3.reset(); // Old producer releases buffer. Should be a noop.
ASSERT_FALSE(ReserveI420Buffer(size_lo)) << "Pool should be empty";
ASSERT_FALSE(ReserveI420Buffer(size_hi)) << "Pool should be empty";
buffer2.reset(); // Active producer releases buffer. Should free a buffer.
buffer1 = ReserveI420Buffer(size_lo);
ASSERT_TRUE(NULL != buffer1.get());
ASSERT_FALSE(ReserveI420Buffer(size_lo)) << "Pool should be empty";
// First consumer finishes.
pool_->RelinquishConsumerHold(buffer_id3, 1);
ASSERT_FALSE(ReserveI420Buffer(size_lo)) << "Pool should be empty";
// Second consumer finishes. This should free that buffer.
pool_->RelinquishConsumerHold(buffer_id3, 1);
buffer3 = ReserveI420Buffer(size_lo);
ASSERT_TRUE(NULL != buffer3.get());
ASSERT_EQ(buffer_id3, buffer3->id()) << "Buffer ID should be reused.";
ASSERT_EQ(memory_pointer3, buffer3->data());
ASSERT_FALSE(ReserveI420Buffer(size_lo)) << "Pool should be empty";
// Now deliver & consume buffer1, but don't release the buffer.
int buffer_id1 = buffer1->id();
ASSERT_EQ(1, buffer_id1);
pool_->HoldForConsumers(buffer_id1, 5);
pool_->RelinquishConsumerHold(buffer_id1, 5);
// Even though the consumer is done with the buffer at |buffer_id1|, it cannot
// be re-allocated to the producer, because |buffer1| still references it. But
// when |buffer1| goes away, we should be able to re-reserve the buffer (and
// the ID ought to be the same).
ASSERT_FALSE(ReserveI420Buffer(size_lo)) << "Pool should be empty";
buffer1.reset(); // Should free the buffer.
buffer2 = ReserveI420Buffer(size_lo);
ASSERT_TRUE(NULL != buffer2.get());
ASSERT_EQ(buffer_id1, buffer2->id());
buffer_id2 = buffer_id1;
ASSERT_FALSE(ReserveI420Buffer(size_lo)) << "Pool should be empty";
// Now try reallocation with different resolutions. We expect reallocation
// to occur only when the old buffer is too small.
buffer2.reset();
ExpectDroppedId(buffer_id2);
buffer2 = ReserveI420Buffer(size_hi);
ASSERT_TRUE(NULL != buffer2.get());
ASSERT_LE(media::VideoFrame::AllocationSize(media::VideoFrame::I420, size_hi),
buffer2->size());
ASSERT_EQ(3, buffer2->id());
void* const memory_pointer_hi = buffer2->data();
buffer2.reset(); // Frees it.
ExpectDroppedId(VideoCaptureBufferPool::kInvalidId);
buffer2 = ReserveI420Buffer(size_lo);
void* const memory_pointer_lo = buffer2->data();
ASSERT_EQ(memory_pointer_hi, memory_pointer_lo)
<< "Decrease in resolution should not reallocate buffer";
ASSERT_TRUE(NULL != buffer2.get());
ASSERT_EQ(3, buffer2->id());
ASSERT_LE(media::VideoFrame::AllocationSize(media::VideoFrame::I420, size_lo),
buffer2->size());
ASSERT_FALSE(ReserveI420Buffer(size_lo)) << "Pool should be empty";
// Tear down the pool_, writing into the buffers. The buffer should preserve
// the lifetime of the underlying memory.
buffer3.reset();
pool_ = NULL;
// Touch the memory.
memset(buffer2->data(), 0x22, buffer2->size());
memset(buffer4->data(), 0x55, buffer4->size());
buffer2.reset();
memset(buffer4->data(), 0x77, buffer4->size());
buffer4.reset();
}
} // namespace content
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