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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.
//
// This file defines the V4L2Device interface which is used by the
// V4L2DecodeAccelerator class to delegate/pass the device specific
// handling of any of the functionalities.
#ifndef CONTENT_COMMON_GPU_MEDIA_V4L2_VIDEO_DEVICE_H_
#define CONTENT_COMMON_GPU_MEDIA_V4L2_VIDEO_DEVICE_H_
#include "media/base/video_decoder_config.h"
#include "media/base/video_frame.h"
#include "ui/gfx/size.h"
#include "ui/gl/gl_bindings.h"
namespace content {
class V4L2Device {
public:
// Utility format conversion functions
static media::VideoFrame::Format V4L2PixFmtToVideoFrameFormat(uint32 format);
static uint32 VideoFrameFormatToV4L2PixFmt(media::VideoFrame::Format format);
static uint32 VideoCodecProfileToV4L2PixFmt(media::VideoCodecProfile profile);
// Convert format requirements requested by a V4L2 device to gfx::Size.
static gfx::Size CodedSizeFromV4L2Format(struct v4l2_format format);
virtual ~V4L2Device();
enum Type {
kDecoder,
kEncoder,
kImageProcessor,
};
// Creates and initializes an appropriate V4L2Device of |type| for the
// current platform and returns a scoped_ptr<V4L2Device> on success, or NULL.
static scoped_ptr<V4L2Device> Create(Type type);
// Parameters and return value are the same as for the standard ioctl() system
// call.
virtual int Ioctl(int request, void* arg) = 0;
// This method sleeps until either:
// - SetDevicePollInterrupt() is called (on another thread),
// - |poll_device| is true, and there is new data to be read from the device,
// or an event from the device has arrived; in the latter case
// |*event_pending| will be set to true.
// Returns false on error, true otherwise.
// This method should be called from a separate thread.
virtual bool Poll(bool poll_device, bool* event_pending) = 0;
// These methods are used to interrupt the thread sleeping on Poll() and force
// it to return regardless of device state, which is usually when the client
// is no longer interested in what happens with the device (on cleanup,
// client state change, etc.). When SetDevicePollInterrupt() is called, Poll()
// will return immediately, and any subsequent calls to it will also do so
// until ClearDevicePollInterrupt() is called.
virtual bool SetDevicePollInterrupt() = 0;
virtual bool ClearDevicePollInterrupt() = 0;
// Wrappers for standard mmap/munmap system calls.
virtual void* Mmap(void* addr,
unsigned int len,
int prot,
int flags,
unsigned int offset) = 0;
virtual void Munmap(void* addr, unsigned int len) = 0;
// Initializes the V4L2Device to operate as a device of |type|.
// Returns true on success.
virtual bool Initialize() = 0;
// Creates an EGLImageKHR since each V4L2Device may use a different method of
// acquiring one and associating it to the given texture. The texture_id is
// used to bind the texture to the returned EGLImageKHR. buffer_index can be
// used to associate the returned EGLImageKHR by the underlying V4L2Device
// implementation.
virtual EGLImageKHR CreateEGLImage(EGLDisplay egl_display,
EGLContext egl_context,
GLuint texture_id,
gfx::Size frame_buffer_size,
unsigned int buffer_index,
size_t planes_count) = 0;
// Destroys the EGLImageKHR.
virtual EGLBoolean DestroyEGLImage(EGLDisplay egl_display,
EGLImageKHR egl_image) = 0;
// Returns the supported texture target for the V4L2Device.
virtual GLenum GetTextureTarget() = 0;
// Returns the preferred V4L2 input format or 0 if don't care.
virtual uint32 PreferredInputFormat() = 0;
// Returns the preferred V4L2 output format or 0 if don't care.
virtual uint32 PreferredOutputFormat() = 0;
};
} // namespace content
#endif // CONTENT_COMMON_GPU_MEDIA_V4L2_VIDEO_DEVICE_H_