ppapi: add helper methods to MediaStreamBufferManager

ppapi/shared_impl/media_stream_buffer_manager_unittest.cc

 // 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 "base/memory/shared_memory.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/shared_impl/media_stream_buffer_manager.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 33 matching lines @@
     MockDelegate delegate;
     MediaStreamBufferManager manager(&delegate);
     scoped_ptr<SharedMemory> shared_memory =
         CreateSharedMemory(kBufferSize, kNumberOfBuffers);
     // SetBuffers with enqueue_all_buffers = true;
     EXPECT_TRUE(manager.SetBuffers(kNumberOfBuffers,
                                    kBufferSize,
                                    shared_memory.Pass(),
                                    true));
 
+
     int8_t* memory = reinterpret_cast<int8_t*>(manager.GetBufferPointer(0));
     EXPECT_NE(static_cast<int8_t*>(NULL), memory);
 
     EXPECT_EQ(kNumberOfBuffers, manager.number_of_buffers());
     EXPECT_EQ(kBufferSize, manager.buffer_size());
+    EXPECT_EQ(kNumberOfBuffers, manager.BuffersAvailable());
 
     // Test DequeueBuffer() and GetBufferPointer()
     for (int32_t i = 0; i < kNumberOfBuffers; ++i) {
+      EXPECT_EQ(kNumberOfBuffers - i, manager.BuffersAvailable());
       EXPECT_EQ(i, manager.DequeueBuffer());
       EXPECT_EQ(reinterpret_cast<MediaStreamBuffer*>(memory + i * kBufferSize),
                 manager.GetBufferPointer(i));
     }
 
+    EXPECT_EQ(0, manager.BuffersAvailable());
     manager.EnqueueBuffer(0);
     manager.EnqueueBuffer(4);
     manager.EnqueueBuffer(3);
     manager.EnqueueBuffer(1);
     manager.EnqueueBuffer(2);
     EXPECT_EQ(5, delegate.new_buffer_enqueue_counter_);
+    EXPECT_EQ(kNumberOfBuffers, manager.BuffersAvailable());
 
     EXPECT_EQ(0, manager.DequeueBuffer());
     EXPECT_EQ(4, manager.DequeueBuffer());
     EXPECT_EQ(3, manager.DequeueBuffer());
     EXPECT_EQ(1, manager.DequeueBuffer());
     EXPECT_EQ(2, manager.DequeueBuffer());
     EXPECT_EQ(PP_ERROR_FAILED, manager.DequeueBuffer());
     EXPECT_EQ(PP_ERROR_FAILED, manager.DequeueBuffer());
 
     // Returns NULL for invalid index to GetBufferPointer()
@@ skipping 18 matching lines @@
     EXPECT_TRUE(manager.SetBuffers(kNumberOfBuffers,
                                    kBufferSize,
                                    shared_memory.Pass(),
                                    false));
 
     int8_t* memory = reinterpret_cast<int8_t*>(manager.GetBufferPointer(0));
     EXPECT_NE(static_cast<int8_t*>(NULL), memory);
 
     EXPECT_EQ(kNumberOfBuffers, manager.number_of_buffers());
     EXPECT_EQ(kBufferSize, manager.buffer_size());
+    EXPECT_EQ(0, manager.BuffersAvailable());
 
     // Test DequeueBuffer() and GetBufferPointer()
     for (int32_t i = 0; i < kNumberOfBuffers; ++i) {
       EXPECT_EQ(PP_ERROR_FAILED, manager.DequeueBuffer());
       EXPECT_EQ(reinterpret_cast<MediaStreamBuffer*>(memory + i * kBufferSize),
                 manager.GetBufferPointer(i));
     }
   }
 }
 
@@ skipping 50 matching lines @@
     // Test DequeueBuffer() and GetBufferPointer()
     for (int32_t i = 0; i < kNumberOfBuffers2; ++i) {
       EXPECT_EQ(i, manager.DequeueBuffer());
       EXPECT_EQ(reinterpret_cast<MediaStreamBuffer*>(memory + i * kBufferSize2),
                 manager.GetBufferPointer(i));
     }
   }
 }
 
 }  // namespace ppapi