| // Copyright 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. |
| |
| #ifndef CONTENT_RENDERER_MEDIA_RTC_VIDEO_DECODER_H_ |
| #define CONTENT_RENDERER_MEDIA_RTC_VIDEO_DECODER_H_ |
| |
| #include <deque> |
| #include <map> |
| #include <set> |
| #include <utility> |
| |
| #include "base/basictypes.h" |
| #include "base/gtest_prod_util.h" |
| #include "base/memory/weak_ptr.h" |
| #include "base/message_loop/message_loop.h" |
| #include "base/synchronization/lock.h" |
| #include "base/synchronization/waitable_event.h" |
| #include "base/threading/thread.h" |
| #include "content/common/content_export.h" |
| #include "media/base/bitstream_buffer.h" |
| #include "media/base/video_decoder.h" |
| #include "media/video/picture.h" |
| #include "media/video/video_decode_accelerator.h" |
| #include "third_party/webrtc/modules/video_coding/codecs/interface/video_codec_interface.h" |
| |
| namespace base { |
| class MessageLoopProxy; |
| }; |
| |
| namespace media { |
| class DecoderBuffer; |
| class GpuVideoDecoderFactories; |
| } |
| |
| namespace content { |
| |
| // This class uses hardware accelerated video decoder to decode video for |
| // WebRTC. |vda_message_loop_| is the message loop proxy of the media thread, |
| // which VDA::Client methods run on. webrtc::VideoDecoder methods run on WebRTC |
| // DecodingThread or Chrome_libJingle_WorkerThread, which are trampolined to |
| // |vda_message_loop_|. Decode() is non-blocking and queues the buffers. Decoded |
| // frames are delivered to WebRTC on |vda_message_loop_|. |
| class CONTENT_EXPORT RTCVideoDecoder |
| : NON_EXPORTED_BASE(public webrtc::VideoDecoder), |
| public media::VideoDecodeAccelerator::Client, |
| public base::MessageLoop::DestructionObserver { |
| public: |
| virtual ~RTCVideoDecoder(); |
| |
| // Creates a RTCVideoDecoder. Returns NULL if failed. The video decoder will |
| // run on the message loop of |factories|. |
| static scoped_ptr<RTCVideoDecoder> Create( |
| webrtc::VideoCodecType type, |
| const scoped_refptr<media::GpuVideoDecoderFactories>& factories); |
| |
| // webrtc::VideoDecoder implementation. |
| // Called on WebRTC DecodingThread. |
| virtual int32_t InitDecode(const webrtc::VideoCodec* codecSettings, |
| int32_t numberOfCores) OVERRIDE; |
| // Called on WebRTC DecodingThread. |
| virtual int32_t Decode( |
| const webrtc::EncodedImage& inputImage, |
| bool missingFrames, |
| const webrtc::RTPFragmentationHeader* fragmentation, |
| const webrtc::CodecSpecificInfo* codecSpecificInfo = NULL, |
| int64_t renderTimeMs = -1) OVERRIDE; |
| // Called on WebRTC DecodingThread. |
| virtual int32_t RegisterDecodeCompleteCallback( |
| webrtc::DecodedImageCallback* callback) OVERRIDE; |
| // Called on Chrome_libJingle_WorkerThread. The child thread is blocked while |
| // this runs. |
| virtual int32_t Release() OVERRIDE; |
| // Called on Chrome_libJingle_WorkerThread. The child thread is blocked while |
| // this runs. |
| virtual int32_t Reset() OVERRIDE; |
| |
| // VideoDecodeAccelerator::Client implementation. |
| virtual void NotifyInitializeDone() OVERRIDE; |
| virtual void ProvidePictureBuffers(uint32 count, |
| const gfx::Size& size, |
| uint32 texture_target) OVERRIDE; |
| virtual void DismissPictureBuffer(int32 id) OVERRIDE; |
| virtual void PictureReady(const media::Picture& picture) OVERRIDE; |
| virtual void NotifyEndOfBitstreamBuffer(int32 id) OVERRIDE; |
| virtual void NotifyFlushDone() OVERRIDE; |
| virtual void NotifyResetDone() OVERRIDE; |
| virtual void NotifyError(media::VideoDecodeAccelerator::Error error) OVERRIDE; |
| |
| // base::DestructionObserver implementation. Called when |vda_message_loop_| |
| // is stopped. |
| virtual void WillDestroyCurrentMessageLoop() OVERRIDE; |
| |
| private: |
| class SHMBuffer; |
| // Metadata of a bitstream buffer. |
| struct BufferData { |
| BufferData(int32 bitstream_buffer_id, |
| uint32_t timestamp, |
| int width, |
| int height, |
| size_t size); |
| BufferData(); |
| ~BufferData(); |
| int32 bitstream_buffer_id; |
| uint32_t timestamp; // in 90KHz |
| uint32_t width; |
| uint32_t height; |
| size_t size; // buffer size |
| }; |
| |
| FRIEND_TEST_ALL_PREFIXES(RTCVideoDecoderTest, IsBufferAfterReset); |
| |
| // The meessage loop of |factories| will be saved to |vda_loop_proxy_|. |
| RTCVideoDecoder( |
| const scoped_refptr<media::GpuVideoDecoderFactories>& factories); |
| |
| void Initialize(base::WaitableEvent* waiter); |
| |
| // Requests a buffer to be decoded by VDA. |
| void RequestBufferDecode(); |
| |
| bool CanMoreDecodeWorkBeDone(); |
| |
| // Returns true if bitstream buffer id |id_buffer| comes after |id_reset|. |
| // This handles the wraparound. |
| bool IsBufferAfterReset(int32 id_buffer, int32 id_reset); |
| |
| // Saves a WebRTC buffer in |decode_buffers_| for decode. |
| void SaveToDecodeBuffers_Locked(const webrtc::EncodedImage& input_image, |
| scoped_ptr<SHMBuffer> shm_buffer, |
| const BufferData& buffer_data); |
| |
| // Saves a WebRTC buffer in |pending_buffers_| waiting for SHM available. |
| // Returns true on success. |
| bool SaveToPendingBuffers_Locked(const webrtc::EncodedImage& input_image, |
| const BufferData& buffer_data); |
| |
| // Gets SHM and moves pending buffers to decode buffers. |
| void MovePendingBuffersToDecodeBuffers(); |
| |
| scoped_refptr<media::VideoFrame> CreateVideoFrame( |
| const media::Picture& picture, |
| const media::PictureBuffer& pb, |
| uint32_t timestamp, |
| uint32_t width, |
| uint32_t height, |
| size_t size); |
| |
| // Resets VDA. |
| void ResetInternal(); |
| |
| // Tells VDA that a picture buffer can be recycled. |
| void ReusePictureBuffer(int64 picture_buffer_id, uint32 sync_point); |
| |
| void DestroyTextures(); |
| void DestroyVDA(); |
| |
| // Gets a shared-memory segment of at least |min_size| bytes from |
| // |available_shm_segments_|. Returns NULL if there is no buffer or the |
| // buffer is not big enough. |
| scoped_ptr<SHMBuffer> GetSHM_Locked(size_t min_size); |
| |
| // Returns a shared-memory segment to the available pool. |
| void PutSHM_Locked(scoped_ptr<SHMBuffer> shm_buffer); |
| |
| // Allocates |number| shared memory of at least |min_size| bytes. |
| void CreateSHM(int number, size_t min_size); |
| |
| // Stores the buffer metadata to |input_buffer_data_|. |
| void RecordBufferData(const BufferData& buffer_data); |
| // Gets the buffer metadata from |input_buffer_data_|. |
| void GetBufferData(int32 bitstream_buffer_id, |
| uint32_t* timestamp, |
| uint32_t* width, |
| uint32_t* height, |
| size_t* size); |
| |
| enum State { |
| UNINITIALIZED, // The decoder has not initialized. |
| INITIALIZED, // The decoder has initialized. |
| RESETTING, // The decoder is being reset. |
| DECODE_ERROR, // Decoding error happened. |
| }; |
| |
| static const int32 ID_LAST; // maximum bitstream buffer id |
| static const int32 ID_HALF; // half of the maximum bitstream buffer id |
| static const int32 ID_INVALID; // indicates Reset or Release never occurred |
| |
| // The hardware video decoder. |
| scoped_ptr<media::VideoDecodeAccelerator> vda_; |
| |
| // The size of the incoming video frames. |
| gfx::Size frame_size_; |
| |
| // The weak pointer should live and die on the |vda_loop_proxy_|; |
| base::WeakPtrFactory<RTCVideoDecoder> weak_factory_; |
| base::WeakPtr<RTCVideoDecoder> weak_this_; |
| |
| scoped_refptr<media::GpuVideoDecoderFactories> factories_; |
| |
| // The message loop to run callbacks on. This is from |factories_|. |
| scoped_refptr<base::MessageLoopProxy> vda_loop_proxy_; |
| |
| // The texture target used for decoded pictures. |
| uint32 decoder_texture_target_; |
| |
| // Metadata of the buffers that have been sent for decode. |
| std::list<BufferData> input_buffer_data_; |
| |
| // A map from bitstream buffer IDs to bitstream buffers that are being |
| // processed by VDA. The map owns SHM buffers. |
| std::map<int32, SHMBuffer*> bitstream_buffers_in_decoder_; |
| |
| // A map from picture buffer IDs to texture-backed picture buffers. |
| std::map<int32, media::PictureBuffer> assigned_picture_buffers_; |
| |
| // Picture buffers that are dismissed but not deleted yet. |
| std::map<int32, media::PictureBuffer> dismissed_picture_buffers_; |
| |
| // PictureBuffers given to us by VDA via PictureReady, which we sent forward |
| // as VideoFrames to be rendered via read_cb_, and which will be returned |
| // to us via ReusePictureBuffer. |
| std::set<int32> picture_buffers_at_display_; |
| |
| // The id that will be given to the next picture buffer. |
| int32 next_picture_buffer_id_; |
| |
| // Protects |state_|, |decode_complete_callback_| , |num_shm_buffers_|, |
| // |available_shm_segments_|, |pending_buffers_|, |decode_buffers_|, |
| // |next_bitstream_buffer_id_| and |reset_bitstream_buffer_id_|. |
| base::Lock lock_; |
| |
| // The state of RTCVideoDecoder. Guarded by |lock_|. |
| State state_; |
| |
| // Guarded by |lock_|. |
| webrtc::DecodedImageCallback* decode_complete_callback_; |
| |
| // Total number of allocated SHM buffers. Guarded by |lock_|. |
| int num_shm_buffers_; |
| |
| // Shared-memory buffer pool. Since allocating SHM segments requires a |
| // round-trip to the browser process, we keep allocation out of the |
| // steady-state of the decoder. The vector owns SHM buffers. Guarded by |
| // |lock_|. |
| std::vector<SHMBuffer*> available_shm_segments_; |
| |
| // A queue storing WebRTC encoding images (and their metadata) that are |
| // waiting for the shared memory. Guarded by |lock_|. |
| std::deque<std::pair<webrtc::EncodedImage, BufferData> > pending_buffers_; |
| |
| // A queue storing buffers (and their metadata) that will be sent to VDA for |
| // decode. The queue owns SHM buffers. Guarded by |lock_|. |
| std::deque<std::pair<SHMBuffer*, BufferData> > decode_buffers_; |
| |
| // The id that will be given to the next bitstream buffer. Guarded by |lock_|. |
| int32 next_bitstream_buffer_id_; |
| |
| // A buffer that has an id less than this should be dropped because Reset or |
| // Release has been called. Guarded by |lock_|. |
| int32 reset_bitstream_buffer_id_; |
| |
| DISALLOW_COPY_AND_ASSIGN(RTCVideoDecoder); |
| }; |
| |
| } // namespace content |
| |
| #endif // CONTENT_RENDERER_MEDIA_RTC_VIDEO_DECODER_H_ |