V4L2VDA: Generalize EGLImage import and query driver for output formats.

content/common/gpu/media/tegra_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 <dlfcn.h>
 #include <fcntl.h>
 #include <linux/videodev2.h>
 
 #include "base/debug/trace_event.h"
 #include "base/lazy_instance.h"
@@ skipping 152 matching lines @@
   }
   device_fd_ = HANDLE_EINTR(
       TegraV4L2_Open(device_path, O_RDWR | O_NONBLOCK | O_CLOEXEC));
   if (device_fd_ == -1) {
     DLOG(ERROR) << "Unable to open device " << device_path;
     return false;
   }
   return true;
 }
 
+bool TegraV4L2Device::CanCreateEGLImageFrom(uint32_t v4l2_pixfmt) {
+  return v4l2_pixfmt == V4L2_PIX_FMT_NV12M;
+}
+
 EGLImageKHR TegraV4L2Device::CreateEGLImage(EGLDisplay egl_display,
                                             EGLContext egl_context,
                                             GLuint texture_id,
                                             gfx::Size /* frame_buffer_size */,
                                             unsigned int buffer_index,
-                                            size_t /* planes_count */) {
+                                            uint32_t v4l2_pixfmt,
+                                            size_t /* num_v4l2_planes */) {
   DVLOG(3) << "CreateEGLImage()";
+  if (!CanCreateEGLImageFrom(v4l2_pixfmt)) {
+    LOG(ERROR) << "Unsupported V4L2 pixel format";
+    return EGL_NO_IMAGE_KHR;
+  }
+
   EGLint attr = EGL_NONE;
   EGLImageKHR egl_image =
       eglCreateImageKHR(egl_display,
                         egl_context,
                         EGL_GL_TEXTURE_2D_KHR,
                         reinterpret_cast<EGLClientBuffer>(texture_id),
                         &attr);
   if (egl_image == EGL_NO_IMAGE_KHR) {
     LOG(ERROR) << "Unable to create EGL image";
     return egl_image;
@@ skipping 13 matching lines @@
 
 GLenum TegraV4L2Device::GetTextureTarget() { return GL_TEXTURE_2D; }
 
 uint32 TegraV4L2Device::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_YUV420M;
 }
 
-uint32 TegraV4L2Device::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