| /* |
| * Copyright 2012 Google Inc. All Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef MEDIA_BASE_SHELL_MEDIA_PLATFORM_H_ |
| #define MEDIA_BASE_SHELL_MEDIA_PLATFORM_H_ |
| |
| #include "base/basictypes.h" |
| #include "base/logging.h" |
| #include "base/memory/ref_counted.h" |
| #include "media/base/decoder_buffer.h" |
| #include "media/base/limits.h" |
| #include "media/base/media_export.h" |
| #include "media/base/shell_buffer_factory.h" |
| #include "media/base/shell_video_data_allocator.h" |
| #include "media/base/shell_video_frame_provider.h" |
| #include "starboard/decode_target.h" |
| |
| namespace media { |
| |
| // This class is meant to be the single point to attach platform specific media |
| // classes and settings. Each platform should implement its own implementation |
| // and provide it through ShellMediaPlatform::Instance. |
| class MEDIA_EXPORT ShellMediaPlatform { |
| public: |
| ShellMediaPlatform() {} |
| virtual ~ShellMediaPlatform() {} |
| |
| // Individual platforms should implement the following two functions to |
| // ensure that a valid ShellMediaPlatform instance is available during the |
| // life time of media stack |
| static void Initialize(); |
| static void Terminate(); |
| |
| static ShellMediaPlatform* Instance(); |
| |
| // The following functions will be called when the application enters or |
| // leaves suspending status. |
| virtual void Suspend() {} |
| virtual void Resume() {} |
| |
| // Media stack buffer allocate/free functions currently only used by |
| // ShellBufferFactory. |
| virtual void* AllocateBuffer(size_t size) = 0; |
| virtual void FreeBuffer(void* ptr) = 0; |
| |
| // The maximum audio and video buffer size used by SourceBufferStream. |
| // See implementation of SourceBufferStream for more details. |
| virtual size_t GetSourceBufferStreamAudioMemoryLimit() const = 0; |
| virtual size_t GetSourceBufferStreamVideoMemoryLimit() const = 0; |
| |
| virtual scoped_refptr<ShellVideoFrameProvider> GetVideoFrameProvider() { |
| return NULL; |
| } |
| |
| #if SB_API_VERSION >= 3 |
| virtual SbDecodeTargetProvider* GetSbDecodeTargetProvider() { return NULL; } |
| #endif // SB_API_VERSION >= 3 |
| |
| // Total number of video frames which are populating in the pipeline when |
| // prerolling. |
| // You can expect more start delay by increasing this. |
| virtual int GetMaxVideoPrerollFrames() const { |
| return limits::kMaxVideoFrames; |
| } |
| // When the video frame backlog contains less frames than this value, the |
| // video renderer will send out underflow notification to the video decoder. |
| virtual int GetVideoUnderflowFrames() const { |
| return GetMaxVideoPrerollFrames(); |
| } |
| // Total number of video frames which are populating in the pipeline. |
| // You can expect more memory usage and less jitter by increasing this. |
| virtual int GetMaxVideoFrames() const { return limits::kMaxVideoFrames; } |
| |
| // This function is called before the decoder buffer leaves the demuxer and |
| // is being sent to the media pipeline for decrypting and decoding. The |
| // default implementation simply returns the buffer indicateing that there is |
| // no processing necessary. |
| virtual scoped_refptr<DecoderBuffer> ProcessBeforeLeavingDemuxer( |
| const scoped_refptr<DecoderBuffer>& buffer) { |
| return buffer; |
| } |
| |
| // Returns true if output is protected (i.e. HDCP is present). |
| virtual bool IsOutputProtected() = 0; |
| |
| protected: |
| static void SetInstance(ShellMediaPlatform* shell_media_platform); |
| |
| private: |
| // Platform specific media Init and Tear down. |
| virtual void InternalInitialize() {} |
| virtual void InternalTerminate() {} |
| |
| DISALLOW_COPY_AND_ASSIGN(ShellMediaPlatform); |
| }; |
| |
| } // namespace media |
| |
| #define REGISTER_SHELL_MEDIA_PLATFORM(ClassName) \ |
| namespace media { \ |
| void ShellMediaPlatform::Initialize() { \ |
| DCHECK(!Instance()); \ |
| SetInstance(new ClassName); \ |
| ShellBufferFactory::Initialize(); \ |
| Instance()->InternalInitialize(); \ |
| } \ |
| void ShellMediaPlatform::Terminate() { \ |
| DCHECK(Instance()); \ |
| Instance()->InternalTerminate(); \ |
| ShellBufferFactory::Terminate(); \ |
| delete Instance(); \ |
| SetInstance(NULL); \ |
| } \ |
| } // namespace media |
| |
| #endif // MEDIA_BASE_SHELL_MEDIA_PLATFORM_H_ |