content/common/gpu/media/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 defines the V4L2Device interface which is used by the
   6 // V4L2DecodeAccelerator class to delegate/pass the device specific
   7 // handling of any of the functionalities.
   8
   9 #ifndef CONTENT_COMMON_GPU_MEDIA_V4L2_DEVICE_H_
  10 #define CONTENT_COMMON_GPU_MEDIA_V4L2_DEVICE_H_
  11
  12 #include "base/memory/ref_counted.h"
  13 #include "content/common/content_export.h"
  14 #include "media/base/video_decoder_config.h"
  15 #include "media/base/video_frame.h"
  16 #include "ui/gfx/geometry/size.h"
  17 #include "ui/gl/gl_bindings.h"
  18
  19 namespace content {
  20
  21 class CONTENT_EXPORT V4L2Device
  22     : public base::RefCountedThreadSafe<V4L2Device> {
  23  public:
  24   // Utility format conversion functions
  25   static media::VideoFrame::Format V4L2PixFmtToVideoFrameFormat(uint32 format);
  26   static uint32 VideoFrameFormatToV4L2PixFmt(media::VideoFrame::Format format);
  27   static uint32 VideoCodecProfileToV4L2PixFmt(media::VideoCodecProfile profile,
  28                                               bool slice_based);
  29   static uint32_t V4L2PixFmtToDrmFormat(uint32_t format);
  30   // Convert format requirements requested by a V4L2 device to gfx::Size.
  31   static gfx::Size CodedSizeFromV4L2Format(struct v4l2_format format);
  32
  33   enum Type {
  34     kDecoder,
  35     kEncoder,
  36     kImageProcessor,
  37   };
  38
  39   // Creates and initializes an appropriate V4L2Device of |type| for the
  40   // current platform and returns a scoped_ptr<V4L2Device> on success, or NULL.
  41   static scoped_refptr<V4L2Device> Create(Type type);
  42
  43   // Parameters and return value are the same as for the standard ioctl() system
  44   // call.
  45   virtual int Ioctl(int request, void* arg) = 0;
  46
  47   // This method sleeps until either:
  48   // - SetDevicePollInterrupt() is called (on another thread),
  49   // - |poll_device| is true, and there is new data to be read from the device,
  50   //   or an event from the device has arrived; in the latter case
  51   //   |*event_pending| will be set to true.
  52   // Returns false on error, true otherwise.
  53   // This method should be called from a separate thread.
  54   virtual bool Poll(bool poll_device, bool* event_pending) = 0;
  55
  56   // These methods are used to interrupt the thread sleeping on Poll() and force
  57   // it to return regardless of device state, which is usually when the client
  58   // is no longer interested in what happens with the device (on cleanup,
  59   // client state change, etc.). When SetDevicePollInterrupt() is called, Poll()
  60   // will return immediately, and any subsequent calls to it will also do so
  61   // until ClearDevicePollInterrupt() is called.
  62   virtual bool SetDevicePollInterrupt() = 0;
  63   virtual bool ClearDevicePollInterrupt() = 0;
  64
  65   // Wrappers for standard mmap/munmap system calls.
  66   virtual void* Mmap(void* addr,
  67                      unsigned int len,
  68                      int prot,
  69                      int flags,
  70                      unsigned int offset) = 0;
  71   virtual void Munmap(void* addr, unsigned int len) = 0;
  72
  73   // Initializes the V4L2Device to operate as a device of |type|.
  74   // Returns true on success.
  75   virtual bool Initialize() = 0;
  76
  77   // Return true if the given V4L2 pixfmt can be used in CreateEGLImage()
  78   // for the current platform.
  79   virtual bool CanCreateEGLImageFrom(uint32_t v4l2_pixfmt) = 0;
  80
  81   // Creates an EGLImageKHR since each V4L2Device may use a different method of
  82   // acquiring one and associating it to the given texture. The texture_id is
  83   // used to bind the texture to the returned EGLImageKHR. buffer_index can be
  84   // used to associate the returned EGLImageKHR by the underlying V4L2Device
  85   // implementation.
  86   virtual EGLImageKHR CreateEGLImage(EGLDisplay egl_display,
  87                                      EGLContext egl_context,
  88                                      GLuint texture_id,
  89                                      gfx::Size frame_buffer_size,
  90                                      unsigned int buffer_index,
  91                                      uint32_t v4l2_pixfmt,
  92                                      size_t num_v4l2_planes) = 0;
  93
  94   // Destroys the EGLImageKHR.
  95   virtual EGLBoolean DestroyEGLImage(EGLDisplay egl_display,
  96                                      EGLImageKHR egl_image) = 0;
  97
  98   // Returns the supported texture target for the V4L2Device.
  99   virtual GLenum GetTextureTarget() = 0;
 100
 101   // Returns the preferred V4L2 input format or 0 if don't care.
 102   virtual uint32 PreferredInputFormat() = 0;
 103
 104  protected:
 105   friend class base::RefCountedThreadSafe<V4L2Device>;
 106   virtual ~V4L2Device();
 107 };
 108
 109 }  //  namespace content
 110
 111 #endif  // CONTENT_COMMON_GPU_MEDIA_V4L2_DEVICE_H_