content/common/gpu/media/generic_v4l2_device.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4 //
   5 // This file contains the implementation of GenericV4L2Device used on
   6 // platforms, which provide generic V4L2 video codec devices.
   7
   8 #ifndef CONTENT_COMMON_GPU_MEDIA_GENERIC_V4L2_DEVICE_H_
   9 #define CONTENT_COMMON_GPU_MEDIA_GENERIC_V4L2_DEVICE_H_
  10
  11 #include "base/files/scoped_file.h"
  12 #include "content/common/gpu/media/v4l2_device.h"
  13
  14 namespace content {
  15
  16 class GenericV4L2Device : public V4L2Device {
  17  public:
  18   explicit GenericV4L2Device(Type type);
  19
  20   // V4L2Device implementation.
  21   int Ioctl(int request, void* arg) override;
  22   bool Poll(bool poll_device, bool* event_pending) override;
  23   bool SetDevicePollInterrupt() override;
  24   bool ClearDevicePollInterrupt() override;
  25   void* Mmap(void* addr,
  26              unsigned int len,
  27              int prot,
  28              int flags,
  29              unsigned int offset) override;
  30   void Munmap(void* addr, unsigned int len) override;
  31   bool Initialize() override;
  32   bool CanCreateEGLImageFrom(uint32_t v4l2_pixfmt) override;
  33   EGLImageKHR CreateEGLImage(EGLDisplay egl_display,
  34                              EGLContext egl_context,
  35                              GLuint texture_id,
  36                              gfx::Size frame_buffer_size,
  37                              unsigned int buffer_index,
  38                              uint32_t v4l2_pixfmt,
  39                              size_t num_v4l2_planes) override;
  40   EGLBoolean DestroyEGLImage(EGLDisplay egl_display,
  41                              EGLImageKHR egl_image) override;
  42   GLenum GetTextureTarget() override;
  43   uint32 PreferredInputFormat() override;
  44
  45  private:
  46   ~GenericV4L2Device() override;
  47
  48   // The actual device fd.
  49   base::ScopedFD device_fd_;
  50
  51   // eventfd fd to signal device poll thread when its poll() should be
  52   // interrupted.
  53   base::ScopedFD device_poll_interrupt_fd_;
  54
  55   // Use libv4l2 when operating |device_fd_|.
  56   bool use_libv4l2_;
  57
  58   DISALLOW_COPY_AND_ASSIGN(GenericV4L2Device);
  59
  60   // Lazily initialize static data after sandbox is enabled.  Return false on
  61   // init failure.
  62   static bool PostSandboxInitialization();
  63 };
  64 }  //  namespace content
  65
  66 #endif  // CONTENT_COMMON_GPU_MEDIA_GENERIC_V4L2_DEVICE_H_