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// 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 MEDIA_CDM_PPAPI_CDM_HELPERS_H_
#define MEDIA_CDM_PPAPI_CDM_HELPERS_H_
#include <map>
#include <utility>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "build/build_config.h"
#include "media/cdm/ppapi/api/content_decryption_module.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/c/pp_stdint.h"
#include "ppapi/cpp/dev/buffer_dev.h"
#include "ppapi/cpp/instance.h"
#include "ppapi/cpp/logging.h"
namespace media {
class PpbBufferAllocator;
// cdm::Buffer implementation that provides access to memory owned by a
// pp::Buffer_Dev.
// This class holds a reference to the Buffer_Dev throughout its lifetime.
// TODO(xhwang): Find a better name. It's confusing to have PpbBuffer,
// pp::Buffer_Dev and PPB_Buffer_Dev.
class PpbBuffer : public cdm::Buffer {
public:
static PpbBuffer* Create(const pp::Buffer_Dev& buffer, uint32_t buffer_id,
PpbBufferAllocator* allocator);
// cdm::Buffer implementation.
virtual void Destroy() override;
virtual uint32_t Capacity() const override;
virtual uint8_t* Data() override;
virtual void SetSize(uint32_t size) override;
virtual uint32_t Size() const override { return size_; }
// Takes the |buffer_| from this class and returns it.
// Note: The caller must ensure |allocator->Release()| is called later so that
// the buffer can be reused by the allocator.
// Since pp::Buffer_Dev is ref-counted, the caller now holds one reference to
// the buffer and this class holds no reference. Note that other references
// may still exist. For example, PpbBufferAllocator always holds a reference
// to all allocated buffers.
pp::Buffer_Dev TakeBuffer();
uint32_t buffer_id() const { return buffer_id_; }
private:
PpbBuffer(pp::Buffer_Dev buffer,
uint32_t buffer_id,
PpbBufferAllocator* allocator);
virtual ~PpbBuffer();
pp::Buffer_Dev buffer_;
uint32_t buffer_id_;
uint32_t size_;
PpbBufferAllocator* allocator_;
DISALLOW_COPY_AND_ASSIGN(PpbBuffer);
};
class PpbBufferAllocator {
public:
explicit PpbBufferAllocator(pp::Instance* instance)
: instance_(instance),
next_buffer_id_(1) {}
~PpbBufferAllocator() {}
cdm::Buffer* Allocate(uint32_t capacity);
// Releases the buffer with |buffer_id|. A buffer can be recycled after
// it is released.
void Release(uint32_t buffer_id);
private:
typedef std::map<uint32_t, pp::Buffer_Dev> AllocatedBufferMap;
typedef std::multimap<uint32_t, std::pair<uint32_t, pp::Buffer_Dev> >
FreeBufferMap;
pp::Buffer_Dev AllocateNewBuffer(uint32_t capacity);
pp::Instance* const instance_;
uint32_t next_buffer_id_;
AllocatedBufferMap allocated_buffers_;
FreeBufferMap free_buffers_;
DISALLOW_COPY_AND_ASSIGN(PpbBufferAllocator);
};
class DecryptedBlockImpl : public cdm::DecryptedBlock {
public:
DecryptedBlockImpl() : buffer_(NULL), timestamp_(0) {}
virtual ~DecryptedBlockImpl() { if (buffer_) buffer_->Destroy(); }
virtual void SetDecryptedBuffer(cdm::Buffer* buffer) override {
buffer_ = static_cast<PpbBuffer*>(buffer);
}
virtual cdm::Buffer* DecryptedBuffer() override { return buffer_; }
virtual void SetTimestamp(int64_t timestamp) override {
timestamp_ = timestamp;
}
virtual int64_t Timestamp() const override { return timestamp_; }
private:
PpbBuffer* buffer_;
int64_t timestamp_;
DISALLOW_COPY_AND_ASSIGN(DecryptedBlockImpl);
};
class VideoFrameImpl : public cdm::VideoFrame {
public:
VideoFrameImpl();
virtual ~VideoFrameImpl();
virtual void SetFormat(cdm::VideoFormat format) override {
format_ = format;
}
virtual cdm::VideoFormat Format() const override { return format_; }
virtual void SetSize(cdm::Size size) override { size_ = size; }
virtual cdm::Size Size() const override { return size_; }
virtual void SetFrameBuffer(cdm::Buffer* frame_buffer) override {
frame_buffer_ = static_cast<PpbBuffer*>(frame_buffer);
}
virtual cdm::Buffer* FrameBuffer() override { return frame_buffer_; }
virtual void SetPlaneOffset(cdm::VideoFrame::VideoPlane plane,
uint32_t offset) override {
PP_DCHECK(plane < kMaxPlanes);
plane_offsets_[plane] = offset;
}
virtual uint32_t PlaneOffset(VideoPlane plane) override {
PP_DCHECK(plane < kMaxPlanes);
return plane_offsets_[plane];
}
virtual void SetStride(VideoPlane plane, uint32_t stride) override {
PP_DCHECK(plane < kMaxPlanes);
strides_[plane] = stride;
}
virtual uint32_t Stride(VideoPlane plane) override {
PP_DCHECK(plane < kMaxPlanes);
return strides_[plane];
}
virtual void SetTimestamp(int64_t timestamp) override {
timestamp_ = timestamp;
}
virtual int64_t Timestamp() const override { return timestamp_; }
private:
// The video buffer format.
cdm::VideoFormat format_;
// Width and height of the video frame.
cdm::Size size_;
// The video frame buffer.
PpbBuffer* frame_buffer_;
// Array of data pointers to each plane in the video frame buffer.
uint32_t plane_offsets_[kMaxPlanes];
// Array of strides for each plane, typically greater or equal to the width
// of the surface divided by the horizontal sampling period. Note that
// strides can be negative.
uint32_t strides_[kMaxPlanes];
// Presentation timestamp in microseconds.
int64_t timestamp_;
DISALLOW_COPY_AND_ASSIGN(VideoFrameImpl);
};
class AudioFramesImpl : public cdm::AudioFrames_2 {
public:
AudioFramesImpl() : buffer_(NULL), format_(cdm::kUnknownAudioFormat) {}
virtual ~AudioFramesImpl() {
if (buffer_)
buffer_->Destroy();
}
// AudioFrames implementation.
virtual void SetFrameBuffer(cdm::Buffer* buffer) override {
buffer_ = static_cast<PpbBuffer*>(buffer);
}
virtual cdm::Buffer* FrameBuffer() override {
return buffer_;
}
virtual void SetFormat(cdm::AudioFormat format) override {
format_ = format;
}
virtual cdm::AudioFormat Format() const override {
return format_;
}
cdm::Buffer* PassFrameBuffer() {
PpbBuffer* temp_buffer = buffer_;
buffer_ = NULL;
return temp_buffer;
}
private:
PpbBuffer* buffer_;
cdm::AudioFormat format_;
DISALLOW_COPY_AND_ASSIGN(AudioFramesImpl);
};
} // namespace media
#endif // MEDIA_CDM_PPAPI_CDM_HELPERS_H_
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