Implement ISO BMFF support in Media Source (try 2).

media/mp4/offset_byte_queue_unittest.cc

+// 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 <string.h>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "media/mp4/offset_byte_queue.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media {
+
+class OffsetByteQueueTest : public testing::Test {
+ public:
+  virtual void SetUp() OVERRIDE {
+    uint8 buf[256];
+    for (int i = 0; i < 256; i++) {
+      buf[i] = i;
+    }
+    queue_.reset(new OffsetByteQueue);
+    queue_->Push(buf, sizeof(buf));
+    queue_->Push(buf, sizeof(buf));
+    queue_->Pop(384);
+
+    // Queue will start with 128 bytes of data and an offset of 384 bytes.
+    // These values are used throughout the test.
+  }
+
+ protected:
+  scoped_ptr<OffsetByteQueue> queue_;
+};
+
+TEST_F(OffsetByteQueueTest, TestSetUp) {
+  EXPECT_EQ(384, queue_->head());
+  EXPECT_EQ(512, queue_->tail());
+
+  const uint8* buf;
+  int size;
+
+  queue_->Peek(&buf, &size);
+  EXPECT_EQ(128, size);
+  EXPECT_EQ(128, buf[0]);
+  EXPECT_EQ(255, buf[size-1]);
+}
+
+TEST_F(OffsetByteQueueTest, TestPeekAt) {
+  const uint8* buf;
+  int size;
+
+  queue_->PeekAt(128, &buf, &size);
+  EXPECT_EQ(NULL, buf);
+  EXPECT_EQ(0, size);
+
+  queue_->PeekAt(400, &buf, &size);
+  EXPECT_EQ(queue_->tail() - 400, size);
+  EXPECT_EQ(400 - 256, buf[0]);
+
+  queue_->PeekAt(512, &buf, &size);
+  EXPECT_EQ(NULL, buf);
+  EXPECT_EQ(0, size);
+}
+
+TEST_F(OffsetByteQueueTest, TestTrim) {
+  EXPECT_TRUE(queue_->Trim(128));
+  EXPECT_TRUE(queue_->Trim(384));
+  EXPECT_EQ(384, queue_->head());
+  EXPECT_EQ(512, queue_->tail());
+
+  EXPECT_TRUE(queue_->Trim(400));
+  EXPECT_EQ(400, queue_->head());
+  EXPECT_EQ(512, queue_->tail());
+
+  const uint8* buf;
+  int size;
+  queue_->PeekAt(400, &buf, &size);
+  EXPECT_EQ(queue_->tail() - 400, size);
+  EXPECT_EQ(400 - 256, buf[0]);
+
+  // Trimming to the exact end of the buffer should return 'true'. This
+  // accomodates EOS cases.
+  EXPECT_TRUE(queue_->Trim(512));
+  EXPECT_EQ(512, queue_->head());
+  queue_->Peek(&buf, &size);
+  EXPECT_EQ(NULL, buf);
+
+  // Trimming past the end of the buffer should return 'false'; we haven't seen
+  // the preceeding bytes.
+  EXPECT_FALSE(queue_->Trim(513));
+
+  // However, doing that shouldn't affect the EOS case. Only adding new data
+  // should alter this behavior.
+  EXPECT_TRUE(queue_->Trim(512));
+}
+
+}  // namespace media