content/common/gpu/media/tegra_v4l2_device.cc

   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 #include <dlfcn.h>
   6 #include <fcntl.h>
   7 #include <linux/videodev2.h>
   8
   9 #include "base/lazy_instance.h"
  10 #include "base/posix/eintr_wrapper.h"
  11 #include "base/trace_event/trace_event.h"
  12 #include "content/common/gpu/media/tegra_v4l2_device.h"
  13 #include "ui/gl/gl_bindings.h"
  14
  15 namespace content {
  16
  17 namespace {
  18 const char kDecoderDevice[] = "/dev/tegra_avpchannel";
  19 const char kEncoderDevice[] = "/dev/nvhost-msenc";
  20 }
  21
  22 typedef int32 (*TegraV4L2Open)(const char* name, int32 flags);
  23 typedef int32 (*TegraV4L2Close)(int32 fd);
  24 typedef int32 (*TegraV4L2Ioctl)(int32 fd, unsigned long cmd, ...);
  25 typedef int32 (*TegraV4L2Poll)(int32 fd, bool poll_device, bool* event_pending);
  26 typedef int32 (*TegraV4L2SetDevicePollInterrupt)(int32 fd);
  27 typedef int32 (*TegraV4L2ClearDevicePollInterrupt)(int32 fd);
  28 typedef void* (*TegraV4L2Mmap)(void* addr,
  29                                size_t length,
  30                                int prot,
  31                                int flags,
  32                                int fd,
  33                                unsigned int offset);
  34 typedef int32 (*TegraV4L2Munmap)(void* addr, size_t length);
  35 typedef int32 (*TegraV4L2UseEglImage)(int fd,
  36                                       unsigned int buffer_index,
  37                                       void* egl_image);
  38
  39 #define TEGRAV4L2_SYM(name) TegraV4L2##name TegraV4L2_##name = NULL
  40
  41 TEGRAV4L2_SYM(Open);
  42 TEGRAV4L2_SYM(Close);
  43 TEGRAV4L2_SYM(Ioctl);
  44 TEGRAV4L2_SYM(Poll);
  45 TEGRAV4L2_SYM(SetDevicePollInterrupt);
  46 TEGRAV4L2_SYM(ClearDevicePollInterrupt);
  47 TEGRAV4L2_SYM(Mmap);
  48 TEGRAV4L2_SYM(Munmap);
  49 TEGRAV4L2_SYM(UseEglImage);
  50
  51 #undef TEGRAV4L2_SYM
  52
  53 class TegraFunctionSymbolFinder {
  54  public:
  55   TegraFunctionSymbolFinder() : initialized_(false) {
  56     if (!dlopen("/usr/lib/libtegrav4l2.so",
  57                 RTLD_NOW | RTLD_GLOBAL | RTLD_NODELETE)) {
  58       DLOG(ERROR) << "Failed to load libtegrav4l2.so";
  59       return;
  60     }
  61 #define TEGRAV4L2_DLSYM_OR_RETURN_ON_ERROR(name)          \
  62   do {                                                    \
  63     TegraV4L2_##name = reinterpret_cast<TegraV4L2##name>( \
  64         dlsym(RTLD_DEFAULT, "TegraV4L2_" #name));         \
  65     if (TegraV4L2_##name == NULL) {                       \
  66       LOG(ERROR) << "Failed to dlsym TegraV4L2_" #name;   \
  67       return;                                             \
  68     }                                                     \
  69   } while (0)
  70
  71     TEGRAV4L2_DLSYM_OR_RETURN_ON_ERROR(Open);
  72     TEGRAV4L2_DLSYM_OR_RETURN_ON_ERROR(Close);
  73     TEGRAV4L2_DLSYM_OR_RETURN_ON_ERROR(Ioctl);
  74     TEGRAV4L2_DLSYM_OR_RETURN_ON_ERROR(Poll);
  75     TEGRAV4L2_DLSYM_OR_RETURN_ON_ERROR(SetDevicePollInterrupt);
  76     TEGRAV4L2_DLSYM_OR_RETURN_ON_ERROR(ClearDevicePollInterrupt);
  77     TEGRAV4L2_DLSYM_OR_RETURN_ON_ERROR(Mmap);
  78     TEGRAV4L2_DLSYM_OR_RETURN_ON_ERROR(Munmap);
  79     TEGRAV4L2_DLSYM_OR_RETURN_ON_ERROR(UseEglImage);
  80 #undef TEGRAV4L2_DLSYM
  81     initialized_ = true;
  82   }
  83
  84   bool initialized() { return initialized_; }
  85
  86  private:
  87   bool initialized_;
  88 };
  89
  90 base::LazyInstance<TegraFunctionSymbolFinder> g_tegra_function_symbol_finder_ =
  91     LAZY_INSTANCE_INITIALIZER;
  92
  93 TegraV4L2Device::TegraV4L2Device(Type type)
  94     : V4L2Device(type),
  95       device_fd_(-1) {
  96 }
  97
  98 TegraV4L2Device::~TegraV4L2Device() {
  99   if (device_fd_ != -1) {
 100     TegraV4L2_Close(device_fd_);
 101     device_fd_ = -1;
 102   }
 103 }
 104
 105 int TegraV4L2Device::Ioctl(int flags, void* arg) {
 106   return HANDLE_EINTR(TegraV4L2_Ioctl(device_fd_, flags, arg));
 107 }
 108
 109 bool TegraV4L2Device::Poll(bool poll_device, bool* event_pending) {
 110   if (HANDLE_EINTR(TegraV4L2_Poll(device_fd_, poll_device, event_pending)) ==
 111       -1) {
 112     LOG(ERROR) << "TegraV4L2Poll returned -1 ";
 113     return false;
 114   }
 115   return true;
 116 }
 117
 118 void* TegraV4L2Device::Mmap(void* addr,
 119                             unsigned int len,
 120                             int prot,
 121                             int flags,
 122                             unsigned int offset) {
 123   return TegraV4L2_Mmap(addr, len, prot, flags, device_fd_, offset);
 124 }
 125
 126 void TegraV4L2Device::Munmap(void* addr, unsigned int len) {
 127   TegraV4L2_Munmap(addr, len);
 128 }
 129
 130 bool TegraV4L2Device::SetDevicePollInterrupt() {
 131   if (HANDLE_EINTR(TegraV4L2_SetDevicePollInterrupt(device_fd_)) == -1) {
 132     LOG(ERROR) << "Error in calling TegraV4L2SetDevicePollInterrupt";
 133     return false;
 134   }
 135   return true;
 136 }
 137
 138 bool TegraV4L2Device::ClearDevicePollInterrupt() {
 139   if (HANDLE_EINTR(TegraV4L2_ClearDevicePollInterrupt(device_fd_)) == -1) {
 140     LOG(ERROR) << "Error in calling TegraV4L2ClearDevicePollInterrupt";
 141     return false;
 142   }
 143   return true;
 144 }
 145
 146 bool TegraV4L2Device::Initialize() {
 147   const char* device_path = NULL;
 148   switch (type_) {
 149     case kDecoder:
 150       device_path = kDecoderDevice;
 151       break;
 152     case kEncoder:
 153       device_path = kEncoderDevice;
 154       break;
 155     default:
 156       DVLOG(1) << "Device type " << type_ << " not supported on this platform";
 157       return false;
 158   }
 159
 160   if (!g_tegra_function_symbol_finder_.Get().initialized()) {
 161     DLOG(ERROR) << "Unable to initialize functions";
 162     return false;
 163   }
 164   device_fd_ = HANDLE_EINTR(
 165       TegraV4L2_Open(device_path, O_RDWR | O_NONBLOCK | O_CLOEXEC));
 166   if (device_fd_ == -1) {
 167     DLOG(ERROR) << "Unable to open device " << device_path;
 168     return false;
 169   }
 170   return true;
 171 }
 172
 173 bool TegraV4L2Device::CanCreateEGLImageFrom(uint32_t v4l2_pixfmt) {
 174   return v4l2_pixfmt == V4L2_PIX_FMT_NV12M;
 175 }
 176
 177 EGLImageKHR TegraV4L2Device::CreateEGLImage(EGLDisplay egl_display,
 178                                             EGLContext egl_context,
 179                                             GLuint texture_id,
 180                                             gfx::Size /* frame_buffer_size */,
 181                                             unsigned int buffer_index,
 182                                             uint32_t v4l2_pixfmt,
 183                                             size_t /* num_v4l2_planes */) {
 184   DVLOG(3) << "CreateEGLImage()";
 185   if (!CanCreateEGLImageFrom(v4l2_pixfmt)) {
 186     LOG(ERROR) << "Unsupported V4L2 pixel format";
 187     return EGL_NO_IMAGE_KHR;
 188   }
 189
 190   EGLint attr = EGL_NONE;
 191   EGLImageKHR egl_image =
 192       eglCreateImageKHR(egl_display,
 193                         egl_context,
 194                         EGL_GL_TEXTURE_2D_KHR,
 195                         reinterpret_cast<EGLClientBuffer>(texture_id),
 196                         &attr);
 197   if (egl_image == EGL_NO_IMAGE_KHR) {
 198     LOG(ERROR) << "Unable to create EGL image";
 199     return egl_image;
 200   }
 201   if (TegraV4L2_UseEglImage(device_fd_, buffer_index, egl_image) != 0) {
 202     LOG(ERROR) << "Unable to use EGL image";
 203     eglDestroyImageKHR(egl_display, egl_image);
 204     egl_image = EGL_NO_IMAGE_KHR;
 205   }
 206   return egl_image;
 207 }
 208
 209 EGLBoolean TegraV4L2Device::DestroyEGLImage(EGLDisplay egl_display,
 210                                             EGLImageKHR egl_image) {
 211   return eglDestroyImageKHR(egl_display, egl_image);
 212 }
 213
 214 GLenum TegraV4L2Device::GetTextureTarget() { return GL_TEXTURE_2D; }
 215
 216 uint32 TegraV4L2Device::PreferredInputFormat() {
 217   // TODO(posciak): We should support "dontcare" returns here once we
 218   // implement proper handling (fallback, negotiation) for this in users.
 219   CHECK_EQ(type_, kEncoder);
 220   return V4L2_PIX_FMT_YUV420M;
 221 }
 222
 223 }  //  namespace content