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// 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.
#ifndef CONTENT_RENDERER_PEPPER_VIDEO_DECODER_SHIM_H_
#define CONTENT_RENDERER_PEPPER_VIDEO_DECODER_SHIM_H_
#include <queue>
#include <vector>
#include "base/basictypes.h"
#include "base/containers/hash_tables.h"
#include "base/memory/linked_ptr.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "gpu/command_buffer/common/mailbox.h"
#include "media/base/video_decoder_config.h"
#include "media/video/video_decode_accelerator.h"
#include "ppapi/c/pp_codecs.h"
namespace base {
class SingleThreadTaskRunner;
}
namespace gpu {
namespace gles2 {
class GLES2Interface;
}
}
namespace media {
class DecoderBuffer;
}
namespace webkit {
namespace gpu {
class ContextProviderWebContext;
}
}
namespace content {
class PepperVideoDecoderHost;
// This class is a shim to wrap a media::VideoDecoder so that it can be used
// by PepperVideoDecoderHost in place of a media::VideoDecodeAccelerator.
// This class should be constructed, used, and destructed on the main (render)
// thread.
class VideoDecoderShim : public media::VideoDecodeAccelerator {
public:
explicit VideoDecoderShim(PepperVideoDecoderHost* host);
virtual ~VideoDecoderShim();
// media::VideoDecodeAccelerator implementation.
virtual bool Initialize(
media::VideoCodecProfile profile,
media::VideoDecodeAccelerator::Client* client) OVERRIDE;
virtual void Decode(const media::BitstreamBuffer& bitstream_buffer) OVERRIDE;
virtual void AssignPictureBuffers(
const std::vector<media::PictureBuffer>& buffers) OVERRIDE;
virtual void ReusePictureBuffer(int32 picture_buffer_id) OVERRIDE;
virtual void Flush() OVERRIDE;
virtual void Reset() OVERRIDE;
virtual void Destroy() OVERRIDE;
private:
enum State {
UNINITIALIZED,
DECODING,
FLUSHING,
RESETTING,
};
struct PendingDecode;
struct PendingFrame;
class DecoderImpl;
void OnInitializeComplete(int32_t result, uint32_t texture_pool_size);
void OnDecodeComplete(int32_t result, uint32_t decode_id);
void OnOutputComplete(scoped_ptr<PendingFrame> frame);
void SendPictures();
void OnResetComplete();
void NotifyCompletedDecodes();
void DismissTexture(uint32_t texture_id);
void DeleteTexture(uint32_t texture_id);
// Call this whenever we change GL state that the plugin relies on, such as
// creating picture textures.
void FlushCommandBuffer();
scoped_ptr<DecoderImpl> decoder_impl_;
State state_;
PepperVideoDecoderHost* host_;
scoped_refptr<base::SingleThreadTaskRunner> media_task_runner_;
scoped_refptr<webkit::gpu::ContextProviderWebContext> context_provider_;
// The current decoded frame size.
gfx::Size texture_size_;
// Map that takes the plugin's GL texture id to the renderer's GL texture id.
typedef base::hash_map<uint32_t, uint32_t> TextureIdMap;
TextureIdMap texture_id_map_;
// Available textures (these are plugin ids.)
typedef base::hash_set<uint32_t> TextureIdSet;
TextureIdSet available_textures_;
// Track textures that are no longer needed (these are plugin ids.)
TextureIdSet textures_to_dismiss_;
// Mailboxes for pending texture requests, to write to plugin's textures.
std::vector<gpu::Mailbox> pending_texture_mailboxes_;
// Queue of completed decode ids, for notifying the host.
typedef std::queue<uint32_t> CompletedDecodeQueue;
CompletedDecodeQueue completed_decodes_;
// Queue of decoded frames that have been converted to RGB and await upload to
// a GL texture.
typedef std::queue<linked_ptr<PendingFrame> > PendingFrameQueue;
PendingFrameQueue pending_frames_;
// The optimal number of textures to allocate for decoder_impl_.
uint32_t texture_pool_size_;
uint32_t num_pending_decodes_;
base::WeakPtrFactory<VideoDecoderShim> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(VideoDecoderShim);
};
} // namespace content
#endif // CONTENT_RENDERER_PEPPER_VIDEO_DECODER_SHIM_H_
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