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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.
#include <stddef.h>
#include <stdint.h>
#include <linux/videodev2.h>
#include "base/files/scoped_file.h"
#include "base/memory/ref_counted.h"
#include "media/base/video_decoder_config.h"
#include "media/base/video_frame.h"
#include "media/gpu/media_gpu_export.h"
#include "media/video/video_decode_accelerator.h"
#include "media/video/video_encode_accelerator.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gl/gl_bindings.h"
// TODO(posciak): remove this once V4L2 headers are updated.
#define V4L2_PIX_FMT_MT21 v4l2_fourcc('M', 'T', '2', '1')
#ifndef V4L2_BUF_FLAG_LAST
#define V4L2_BUF_FLAG_LAST 0x00100000
namespace media {
: public base::RefCountedThreadSafe<V4L2Device> {
// Utility format conversion functions
static VideoPixelFormat V4L2PixFmtToVideoPixelFormat(uint32_t format);
static uint32_t VideoPixelFormatToV4L2PixFmt(VideoPixelFormat format);
static uint32_t VideoCodecProfileToV4L2PixFmt(VideoCodecProfile profile,
bool slice_based);
std::vector<VideoCodecProfile> V4L2PixFmtToVideoCodecProfiles(
uint32_t pix_fmt,
bool is_encoder);
static uint32_t V4L2PixFmtToDrmFormat(uint32_t format);
// Convert format requirements requested by a V4L2 device to gfx::Size.
static gfx::Size CodedSizeFromV4L2Format(struct v4l2_format format);
enum class Type {
// Create and initialize an appropriate V4L2Device instance for the current
// platform, or return nullptr if not available.
static scoped_refptr<V4L2Device> Create();
// Open a V4L2 device of |type| for use with |v4l2_pixfmt|.
// Return true on success.
// The device will be closed in the destructor.
virtual bool Open(Type type, uint32_t v4l2_pixfmt) = 0;
// 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;
// Return a vector of dmabuf file descriptors, exported for V4L2 buffer with
// |index|, assuming the buffer contains |num_planes| V4L2 planes and is of
// |type|. Return an empty vector on failure.
// The caller is responsible for closing the file descriptors after use.
virtual std::vector<base::ScopedFD> GetDmabufsForV4L2Buffer(
int index,
size_t num_planes,
enum v4l2_buf_type type) = 0;
// Return true if the given V4L2 pixfmt can be used in CreateEGLImage()
// for the current platform.
virtual bool CanCreateEGLImageFrom(uint32_t v4l2_pixfmt) = 0;
// Create an EGLImage from provided |dmabuf_fds| and bind |texture_id| to it.
// Some implementations may also require the V4L2 |buffer_index| of the buffer
// for which |dmabuf_fds| have been exported.
// The caller may choose to close the file descriptors after this method
// returns, and may expect the buffers to remain valid for the lifetime of
// the created EGLImage.
// Return EGL_NO_IMAGE_KHR on failure.
virtual EGLImageKHR CreateEGLImage(
EGLDisplay egl_display,
EGLContext egl_context,
GLuint texture_id,
const gfx::Size& size,
unsigned int buffer_index,
uint32_t v4l2_pixfmt,
const std::vector<base::ScopedFD>& dmabuf_fds) = 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 for |type| or 0 if none.
virtual uint32_t PreferredInputFormat(Type type) = 0;
// NOTE: The below methods to query capabilities have a side effect of
// closing the previously-open device, if any, and should not be called after
// Open().
// TODO(posciak): fix this.
// Get minimum and maximum resolution for fourcc |pixelformat| and store to
// |min_resolution| and |max_resolution|.
void GetSupportedResolution(uint32_t pixelformat,
gfx::Size* min_resolution,
gfx::Size* max_resolution);
// Return V4L2 pixelformats supported by the available image processor
// devices for |buf_type|.
virtual std::vector<uint32_t> GetSupportedImageProcessorPixelformats(
v4l2_buf_type buf_type) = 0;
// Return supported profiles for decoder, including only profiles for given
// fourcc |pixelformats|.
virtual VideoDecodeAccelerator::SupportedProfiles GetSupportedDecodeProfiles(
const size_t num_formats,
const uint32_t pixelformats[]) = 0;
// Return supported profiles for encoder.
virtual VideoEncodeAccelerator::SupportedProfiles
GetSupportedEncodeProfiles() = 0;
// Return true if image processing is supported, false otherwise.
virtual bool IsImageProcessingSupported() = 0;
// Return true if JPEG decoding is supported, false otherwise.
virtual bool IsJpegDecodingSupported() = 0;
friend class base::RefCountedThreadSafe<V4L2Device>;
virtual ~V4L2Device();
VideoDecodeAccelerator::SupportedProfiles EnumerateSupportedDecodeProfiles(
const size_t num_formats,
const uint32_t pixelformats[]);
VideoEncodeAccelerator::SupportedProfiles EnumerateSupportedEncodeProfiles();
std::vector<uint32_t> EnumerateSupportedPixelformats(v4l2_buf_type buf_type);
// Perform platform-specific initialization of the device instance.
// Return true on success, false on error or if the particular implementation
// is not available.
virtual bool Initialize() = 0;
} // namespace media
#endif // MEDIA_GPU_V4L2_DEVICE_H_