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 "media/video/video_decode_accelerator.h"
  17 #include "ui/gfx/geometry/size.h"
  18 #include "ui/gl/gl_bindings.h"
  19
  20 // TODO(posciak): remove this once V4L2 headers are updated.
  21 #define V4L2_PIX_FMT_VP9 v4l2_fourcc('V', 'P', '9', '0')
  22 #define V4L2_PIX_FMT_H264_SLICE v4l2_fourcc('S', '2', '6', '4')
  23 #define V4L2_PIX_FMT_VP8_FRAME v4l2_fourcc('V', 'P', '8', 'F')
  24
  25 namespace content {
  26
  27 class CONTENT_EXPORT V4L2Device
  28     : public base::RefCountedThreadSafe<V4L2Device> {
  29  public:
  30   // Utility format conversion functions
  31   static media::VideoFrame::Format V4L2PixFmtToVideoFrameFormat(uint32 format);
  32   static uint32 VideoFrameFormatToV4L2PixFmt(media::VideoFrame::Format format);
  33   static uint32 VideoCodecProfileToV4L2PixFmt(media::VideoCodecProfile profile,
  34                                               bool slice_based);
  35   static uint32_t V4L2PixFmtToDrmFormat(uint32_t format);
  36   // Convert format requirements requested by a V4L2 device to gfx::Size.
  37   static gfx::Size CodedSizeFromV4L2Format(struct v4l2_format format);
  38
  39   enum Type {
  40     kDecoder,
  41     kEncoder,
  42     kImageProcessor,
  43   };
  44
  45   // Creates and initializes an appropriate V4L2Device of |type| for the
  46   // current platform and returns a scoped_ptr<V4L2Device> on success, or NULL.
  47   static scoped_refptr<V4L2Device> Create(Type type);
  48
  49   // Parameters and return value are the same as for the standard ioctl() system
  50   // call.
  51   virtual int Ioctl(int request, void* arg) = 0;
  52
  53   // This method sleeps until either:
  54   // - SetDevicePollInterrupt() is called (on another thread),
  55   // - |poll_device| is true, and there is new data to be read from the device,
  56   //   or an event from the device has arrived; in the latter case
  57   //   |*event_pending| will be set to true.
  58   // Returns false on error, true otherwise.
  59   // This method should be called from a separate thread.
  60   virtual bool Poll(bool poll_device, bool* event_pending) = 0;
  61
  62   // These methods are used to interrupt the thread sleeping on Poll() and force
  63   // it to return regardless of device state, which is usually when the client
  64   // is no longer interested in what happens with the device (on cleanup,
  65   // client state change, etc.). When SetDevicePollInterrupt() is called, Poll()
  66   // will return immediately, and any subsequent calls to it will also do so
  67   // until ClearDevicePollInterrupt() is called.
  68   virtual bool SetDevicePollInterrupt() = 0;
  69   virtual bool ClearDevicePollInterrupt() = 0;
  70
  71   // Wrappers for standard mmap/munmap system calls.
  72   virtual void* Mmap(void* addr,
  73                      unsigned int len,
  74                      int prot,
  75                      int flags,
  76                      unsigned int offset) = 0;
  77   virtual void Munmap(void* addr, unsigned int len) = 0;
  78
  79   // Initializes the V4L2Device to operate as a device of |type|.
  80   // Returns true on success.
  81   virtual bool Initialize() = 0;
  82
  83   // Return true if the given V4L2 pixfmt can be used in CreateEGLImage()
  84   // for the current platform.
  85   virtual bool CanCreateEGLImageFrom(uint32_t v4l2_pixfmt) = 0;
  86
  87   // Creates an EGLImageKHR since each V4L2Device may use a different method of
  88   // acquiring one and associating it to the given texture. The texture_id is
  89   // used to bind the texture to the returned EGLImageKHR. buffer_index can be
  90   // used to associate the returned EGLImageKHR by the underlying V4L2Device
  91   // implementation.
  92   virtual EGLImageKHR CreateEGLImage(EGLDisplay egl_display,
  93                                      EGLContext egl_context,
  94                                      GLuint texture_id,
  95                                      gfx::Size frame_buffer_size,
  96                                      unsigned int buffer_index,
  97                                      uint32_t v4l2_pixfmt,
  98                                      size_t num_v4l2_planes) = 0;
  99
 100   // Destroys the EGLImageKHR.
 101   virtual EGLBoolean DestroyEGLImage(EGLDisplay egl_display,
 102                                      EGLImageKHR egl_image) = 0;
 103
 104   // Returns the supported texture target for the V4L2Device.
 105   virtual GLenum GetTextureTarget() = 0;
 106
 107   // Returns the preferred V4L2 input format or 0 if don't care.
 108   virtual uint32 PreferredInputFormat() = 0;
 109
 110   // Get minimum and maximum resolution for fourcc |pixelformat| and store to
 111   // |min_resolution| and |max_resolution|.
 112   void GetSupportedResolution(uint32_t pixelformat, gfx::Size* min_resolution,
 113                               gfx::Size* max_resolution);
 114
 115   // Return supported profiles for decoder, including only profiles for given
 116   // fourcc |pixelformats|.
 117   media::VideoDecodeAccelerator::SupportedProfiles GetSupportedDecodeProfiles(
 118       const size_t num_formats, const uint32_t pixelformats[]);
 119
 120  protected:
 121   friend class base::RefCountedThreadSafe<V4L2Device>;
 122   explicit V4L2Device(Type type);
 123   virtual ~V4L2Device();
 124
 125   const Type type_;
 126 };
 127
 128 }  //  namespace content
 129
 130 #endif  // CONTENT_COMMON_GPU_MEDIA_V4L2_DEVICE_H_