Generalize V4L2 HW video codec device names

content/common/gpu/media/exynos_v4l2_video_device.cc

-// 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.
-//
-
-#include <fcntl.h>
-#include <libdrm/drm_fourcc.h>
-#include <linux/videodev2.h>
-#include <poll.h>
-#include <sys/eventfd.h>
-#include <sys/ioctl.h>
-#include <sys/mman.h>
-
-#include "base/debug/trace_event.h"
-#include "base/files/scoped_file.h"
-#include "base/posix/eintr_wrapper.h"
-#include "content/common/gpu/media/exynos_v4l2_video_device.h"
-#include "ui/gl/gl_bindings.h"
-
-namespace content {
-
-namespace {
-const char kDecoderDevice[] = "/dev/mfc-dec";
-const char kEncoderDevice[] = "/dev/mfc-enc";
-const char kImageProcessorDevice[] = "/dev/gsc1";
-}
-
-ExynosV4L2Device::ExynosV4L2Device(Type type)
-    : type_(type),
-      device_fd_(-1),
-      device_poll_interrupt_fd_(-1) {}
-
-ExynosV4L2Device::~ExynosV4L2Device() {
-  if (device_poll_interrupt_fd_ != -1) {
-    close(device_poll_interrupt_fd_);
-    device_poll_interrupt_fd_ = -1;
-  }
-  if (device_fd_ != -1) {
-    close(device_fd_);
-    device_fd_ = -1;
-  }
-}
-
-int ExynosV4L2Device::Ioctl(int request, void* arg) {
-  return HANDLE_EINTR(ioctl(device_fd_, request, arg));
-}
-
-bool ExynosV4L2Device::Poll(bool poll_device, bool* event_pending) {
-  struct pollfd pollfds[2];
-  nfds_t nfds;
-  int pollfd = -1;
-
-  pollfds[0].fd = device_poll_interrupt_fd_;
-  pollfds[0].events = POLLIN | POLLERR;
-  nfds = 1;
-
-  if (poll_device) {
-    DVLOG(3) << "Poll(): adding device fd to poll() set";
-    pollfds[nfds].fd = device_fd_;
-    pollfds[nfds].events = POLLIN | POLLOUT | POLLERR | POLLPRI;
-    pollfd = nfds;
-    nfds++;
-  }
-
-  if (HANDLE_EINTR(poll(pollfds, nfds, -1)) == -1) {
-    DPLOG(ERROR) << "poll() failed";
-    return false;
-  }
-  *event_pending = (pollfd != -1 && pollfds[pollfd].revents & POLLPRI);
-  return true;
-}
-
-void* ExynosV4L2Device::Mmap(void* addr,
-                             unsigned int len,
-                             int prot,
-                             int flags,
-                             unsigned int offset) {
-  return mmap(addr, len, prot, flags, device_fd_, offset);
-}
-
-void ExynosV4L2Device::Munmap(void* addr, unsigned int len) {
-  munmap(addr, len);
-}
-
-bool ExynosV4L2Device::SetDevicePollInterrupt() {
-  DVLOG(3) << "SetDevicePollInterrupt()";
-
-  const uint64 buf = 1;
-  if (HANDLE_EINTR(write(device_poll_interrupt_fd_, &buf, sizeof(buf))) == -1) {
-    DPLOG(ERROR) << "SetDevicePollInterrupt(): write() failed";
-    return false;
-  }
-  return true;
-}
-
-bool ExynosV4L2Device::ClearDevicePollInterrupt() {
-  DVLOG(3) << "ClearDevicePollInterrupt()";
-
-  uint64 buf;
-  if (HANDLE_EINTR(read(device_poll_interrupt_fd_, &buf, sizeof(buf))) == -1) {
-    if (errno == EAGAIN) {
-      // No interrupt flag set, and we're reading nonblocking.  Not an error.
-      return true;
-    } else {
-      DPLOG(ERROR) << "ClearDevicePollInterrupt(): read() failed";
-      return false;
-    }
-  }
-  return true;
-}
-
-bool ExynosV4L2Device::Initialize() {
-  const char* device_path = NULL;
-  switch (type_) {
-    case kDecoder:
-      device_path = kDecoderDevice;
-      break;
-    case kEncoder:
-      device_path = kEncoderDevice;
-      break;
-    case kImageProcessor:
-      device_path = kImageProcessorDevice;
-      break;
-  }
-
-  DVLOG(2) << "Initialize(): opening device: " << device_path;
-  // Open the video device.
-  device_fd_ = HANDLE_EINTR(open(device_path, O_RDWR | O_NONBLOCK | O_CLOEXEC));
-  if (device_fd_ == -1) {
-    return false;
-  }
-
-  device_poll_interrupt_fd_ = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
-  if (device_poll_interrupt_fd_ == -1) {
-    return false;
-  }
-  return true;
-}
-
-EGLImageKHR ExynosV4L2Device::CreateEGLImage(EGLDisplay egl_display,
-                                             EGLContext /* egl_context */,
-                                             GLuint texture_id,
-                                             gfx::Size frame_buffer_size,
-                                             unsigned int buffer_index,
-                                             size_t planes_count) {
-  DVLOG(3) << "CreateEGLImage()";
-
-  scoped_ptr<base::ScopedFD[]> dmabuf_fds(new base::ScopedFD[planes_count]);
-  for (size_t i = 0; i < planes_count; ++i) {
-    // Export the DMABUF fd so we can export it as a texture.
-    struct v4l2_exportbuffer expbuf;
-    memset(&expbuf, 0, sizeof(expbuf));
-    expbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
-    expbuf.index = buffer_index;
-    expbuf.plane = i;
-    expbuf.flags = O_CLOEXEC;
-    if (Ioctl(VIDIOC_EXPBUF, &expbuf) != 0) {
-      return EGL_NO_IMAGE_KHR;
-    }
-    dmabuf_fds[i].reset(expbuf.fd);
-  }
-  DCHECK_EQ(planes_count, 2u);
-  EGLint attrs[] = {
-      EGL_WIDTH,                     0, EGL_HEIGHT,                    0,
-      EGL_LINUX_DRM_FOURCC_EXT,      0, EGL_DMA_BUF_PLANE0_FD_EXT,     0,
-      EGL_DMA_BUF_PLANE0_OFFSET_EXT, 0, EGL_DMA_BUF_PLANE0_PITCH_EXT,  0,
-      EGL_DMA_BUF_PLANE1_FD_EXT,     0, EGL_DMA_BUF_PLANE1_OFFSET_EXT, 0,
-      EGL_DMA_BUF_PLANE1_PITCH_EXT,  0, EGL_NONE, };
-  attrs[1] = frame_buffer_size.width();
-  attrs[3] = frame_buffer_size.height();
-  attrs[5] = DRM_FORMAT_NV12;
-  attrs[7] = dmabuf_fds[0].get();
-  attrs[9] = 0;
-  attrs[11] = frame_buffer_size.width();
-  attrs[13] = dmabuf_fds[1].get();
-  attrs[15] = 0;
-  attrs[17] = frame_buffer_size.width();
-
-  EGLImageKHR egl_image = eglCreateImageKHR(
-      egl_display, EGL_NO_CONTEXT, EGL_LINUX_DMA_BUF_EXT, NULL, attrs);
-  if (egl_image == EGL_NO_IMAGE_KHR) {
-    return egl_image;
-  }
-  glBindTexture(GL_TEXTURE_EXTERNAL_OES, texture_id);
-  glEGLImageTargetTexture2DOES(GL_TEXTURE_EXTERNAL_OES, egl_image);
-
-  return egl_image;
-}
-
-EGLBoolean ExynosV4L2Device::DestroyEGLImage(EGLDisplay egl_display,
-                                             EGLImageKHR egl_image) {
-  return eglDestroyImageKHR(egl_display, egl_image);
-}
-
-GLenum ExynosV4L2Device::GetTextureTarget() { return GL_TEXTURE_EXTERNAL_OES; }
-
-uint32 ExynosV4L2Device::PreferredInputFormat() {
-  // TODO(posciak): We should support "dontcare" returns here once we
-  // implement proper handling (fallback, negotiation) for this in users.
-  CHECK_EQ(type_, kEncoder);
-  return V4L2_PIX_FMT_NV12M;
-}
-
-uint32 ExynosV4L2Device::PreferredOutputFormat() {
-  // TODO(posciak): We should support "dontcare" returns here once we
-  // implement proper handling (fallback, negotiation) for this in users.
-  CHECK_EQ(type_, kDecoder);
-  return V4L2_PIX_FMT_NV12M;
-}
-
-}  //  namespace content