Sync NaCl MediaStream Video example with ppapi/examples/media_stream_video

native_client_sdk/src/examples/api/media_stream_video/media_stream_video.cc

Index: native_client_sdk/src/examples/api/media_stream_video/media_stream_video.cc
diff --git a/native_client_sdk/src/examples/api/media_stream_video/media_stream_video.cc b/native_client_sdk/src/examples/api/media_stream_video/media_stream_video.cc
index 831d98ae3636dc75c09a5f66e58c3e161924cdee..727077bfdd353fdb05f7bb7c7646bd038e2683e5 100644
--- a/native_client_sdk/src/examples/api/media_stream_video/media_stream_video.cc
+++ b/native_client_sdk/src/examples/api/media_stream_video/media_stream_video.cc
@@ -2,7 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "GLES2/gl2.h"
+#include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+#include <string.h>
+
+#include <vector>
+
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/ppb_opengles2.h"
 #include "ppapi/cpp/completion_callback.h"
@@ -14,6 +19,7 @@
 #include "ppapi/cpp/rect.h"
 #include "ppapi/cpp/var.h"
 #include "ppapi/cpp/video_frame.h"
+#include "ppapi/lib/gl/gles2/gl2ext_ppapi.h"
 #include "ppapi/utility/completion_callback_factory.h"
 
 // When compiling natively on Windows, PostMessage can be #define-d to
@@ -25,7 +31,7 @@
 // Assert |context_| isn't holding any GL Errors.  Done as a macro instead of a
 // function to preserve line number information in the failure message.
 #define AssertNoGLError() \
-  PP_DCHECK(!gles2_if_->GetError(context_->pp_resource()));
+  PP_DCHECK(!glGetError());
 
 namespace {
 
@@ -53,35 +59,49 @@ class MediaStreamVideoDemoInstance : public pp::Instance,
   // pp::Graphics3DClient implementation.
   virtual void Graphics3DContextLost() {
     InitGL();
-    CreateYUVTextures();
+    CreateTextures();
     Render();
   }
 
  private:
+  void DrawYUV();
+  void DrawRGB();
   void Render();
 
   // GL-related functions.
   void InitGL();
-  GLuint CreateTexture(int32_t width, int32_t height, int unit);
+  GLuint CreateTexture(int32_t width, int32_t height, int unit, bool rgba);
   void CreateGLObjects();
-  void CreateShader(GLuint program, GLenum type, const char* source, int size);
+  void CreateShader(GLuint program, GLenum type, const char* source);
   void PaintFinished(int32_t result);
-  void CreateYUVTextures();
+  void CreateTextures();
+  void ConfigureTrack();
+
 
-  // Callback that is invoked when new frames are recevied.
+  // MediaStreamVideoTrack callbacks.
+  void OnConfigure(int32_t result);
   void OnGetFrame(int32_t result, pp::VideoFrame frame);
 
   pp::Size position_size_;
   bool is_painting_;
   bool needs_paint_;
+  bool is_bgra_;
+  GLuint program_yuv_;
+  GLuint program_rgb_;
+  GLuint buffer_;
   GLuint texture_y_;
   GLuint texture_u_;
   GLuint texture_v_;
+  GLuint texture_rgb_;
   pp::MediaStreamVideoTrack video_track_;
   pp::CompletionCallbackFactory<MediaStreamVideoDemoInstance> callback_factory_;
+  std::vector<int32_t> attrib_list_;
 
-  // Unowned pointers.
-  const struct PPB_OpenGLES2* gles2_if_;
+  // MediaStreamVideoTrack attributes:
+  bool need_config_;
+  PP_VideoFrame_Format attrib_format_;
+  int32_t attrib_width_;
+  int32_t attrib_height_;
 
   // Owned data.
   pp::Graphics3D* context_;
@@ -95,14 +115,21 @@ MediaStreamVideoDemoInstance::MediaStreamVideoDemoInstance(
       pp::Graphics3DClient(this),
       is_painting_(false),
       needs_paint_(false),
+      is_bgra_(false),
       texture_y_(0),
       texture_u_(0),
       texture_v_(0),
+      texture_rgb_(0),
       callback_factory_(this),
+      need_config_(false),
+      attrib_format_(PP_VIDEOFRAME_FORMAT_I420),
+      attrib_width_(0),
+      attrib_height_(0),
       context_(NULL) {
-  gles2_if_ = static_cast<const struct PPB_OpenGLES2*>(
-      module->GetBrowserInterface(PPB_OPENGLES2_INTERFACE));
-  PP_DCHECK(gles2_if_);
+  if (!glInitializePPAPI(pp::Module::Get()->get_browser_interface())) {
+    LogToConsole(PP_LOGLEVEL_ERROR, pp::Var("Unable to initialize GL PPAPI!"));
+    assert(false);
+  }
 }
 
 MediaStreamVideoDemoInstance::~MediaStreamVideoDemoInstance() {
@@ -124,19 +151,40 @@ void MediaStreamVideoDemoInstance::DidChangeView(
 }
 
 void MediaStreamVideoDemoInstance::HandleMessage(const pp::Var& var_message) {
-  if (!var_message.is_dictionary())
+  if (!var_message.is_dictionary()) {
+    LogToConsole(PP_LOGLEVEL_ERROR, pp::Var("Invalid message!"));
     return;
-  pp::VarDictionary var_dictionary_message(var_message);
-  pp::Var var_track = var_dictionary_message.Get("track");
-  if (!var_track.is_resource())
-    return;
-
-  pp::Resource resource_track = var_track.AsResource();
-
-  video_track_ = pp::MediaStreamVideoTrack(resource_track);
+  }
 
-  video_track_.GetFrame(callback_factory_.NewCallbackWithOutput(
-        &MediaStreamVideoDemoInstance::OnGetFrame));
+  pp::VarDictionary var_dictionary_message(var_message);
+  std::string command = var_dictionary_message.Get("command").AsString();
+
+  if (command == "init") {
+    pp::Var var_track = var_dictionary_message.Get("track");
+    if (!var_track.is_resource())
+      return;
+    pp::Resource resource_track = var_track.AsResource();
+    video_track_ = pp::MediaStreamVideoTrack(resource_track);
+    ConfigureTrack();
+  } else if (command == "format") {
+    std::string str_format = var_dictionary_message.Get("format").AsString();
+    if (str_format == "YV12") {
+      attrib_format_ = PP_VIDEOFRAME_FORMAT_YV12;
+    } else if (str_format == "I420") {
+      attrib_format_ = PP_VIDEOFRAME_FORMAT_I420;
+    } else if (str_format == "BGRA") {
+      attrib_format_ = PP_VIDEOFRAME_FORMAT_BGRA;
+    } else {
+      attrib_format_ = PP_VIDEOFRAME_FORMAT_UNKNOWN;
+    }
+    need_config_ = true;
+  } else if (command == "size") {
+    attrib_width_ = var_dictionary_message.Get("width").AsInt();
+    attrib_height_ = var_dictionary_message.Get("height").AsInt();
+    need_config_ = true;
+  } else {
+    LogToConsole(PP_LOGLEVEL_ERROR, pp::Var("Invalid command!"));
+  }
 }
 
 void MediaStreamVideoDemoInstance::InitGL() {
@@ -160,11 +208,12 @@ void MediaStreamVideoDemoInstance::InitGL() {
   context_ = new pp::Graphics3D(this, attributes);
   PP_DCHECK(!context_->is_null());
 
+  glSetCurrentContextPPAPI(context_->pp_resource());
+
   // Set viewport window size and clear color bit.
-  gles2_if_->ClearColor(context_->pp_resource(), 1, 0, 0, 1);
-  gles2_if_->Clear(context_->pp_resource(), GL_COLOR_BUFFER_BIT);
-  gles2_if_->Viewport(context_->pp_resource(), 0, 0,
-                      position_size_.width(), position_size_.height());
+  glClearColor(1, 0, 0, 1);
+  glClear(GL_COLOR_BUFFER_BIT);
+  glViewport(0, 0, position_size_.width(), position_size_.height());
 
   BindGraphics(*context_);
   AssertNoGLError();
@@ -172,14 +221,63 @@ void MediaStreamVideoDemoInstance::InitGL() {
   CreateGLObjects();
 }
 
+void MediaStreamVideoDemoInstance::DrawYUV() {
+  static const float kColorMatrix[9] = {
+    1.1643828125f, 1.1643828125f, 1.1643828125f,
+    0.0f, -0.39176171875f, 2.017234375f,
+    1.59602734375f, -0.81296875f, 0.0f
+  };
+
+  glUseProgram(program_yuv_);
+  glUniform1i(glGetUniformLocation(program_yuv_, "y_texture"), 0);
+  glUniform1i(glGetUniformLocation(program_yuv_, "u_texture"), 1);
+  glUniform1i(glGetUniformLocation(program_yuv_, "v_texture"), 2);
+  glUniformMatrix3fv(glGetUniformLocation(program_yuv_, "color_matrix"),
+      1, GL_FALSE, kColorMatrix);
+  AssertNoGLError();
+
+  GLint pos_location = glGetAttribLocation(program_yuv_, "a_position");
+  GLint tc_location = glGetAttribLocation(program_yuv_, "a_texCoord");
+  AssertNoGLError();
+  glEnableVertexAttribArray(pos_location);
+  glVertexAttribPointer(pos_location, 2, GL_FLOAT, GL_FALSE, 0, 0);
+  glEnableVertexAttribArray(tc_location);
+  glVertexAttribPointer(tc_location, 2, GL_FLOAT, GL_FALSE, 0,
+      static_cast<float*>(0) + 16);  // Skip position coordinates.
+  AssertNoGLError();
+
+  glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+  AssertNoGLError();
+}
+
+void MediaStreamVideoDemoInstance::DrawRGB() {
+  glUseProgram(program_rgb_);
+  glUniform1i(glGetUniformLocation(program_rgb_, "rgb_texture"), 3);
+  AssertNoGLError();
+
+  GLint pos_location = glGetAttribLocation(program_rgb_, "a_position");
+  GLint tc_location = glGetAttribLocation(program_rgb_, "a_texCoord");
+  AssertNoGLError();
+  glEnableVertexAttribArray(pos_location);
+  glVertexAttribPointer(pos_location, 2, GL_FLOAT, GL_FALSE, 0, 0);
+  glEnableVertexAttribArray(tc_location);
+  glVertexAttribPointer(tc_location, 2, GL_FLOAT, GL_FALSE, 0,
+      static_cast<float*>(0) + 16);  // Skip position coordinates.
+  AssertNoGLError();
+
+  glDrawArrays(GL_TRIANGLE_STRIP, 4, 4);
+}
+
 void MediaStreamVideoDemoInstance::Render() {
   PP_DCHECK(!is_painting_);
   is_painting_ = true;
   needs_paint_ = false;
+
   if (texture_y_) {
-    gles2_if_->DrawArrays(context_->pp_resource(), GL_TRIANGLE_STRIP, 0, 4);
+    DrawRGB();
+    DrawYUV();
   } else {
-    gles2_if_->Clear(context_->pp_resource(), GL_COLOR_BUFFER_BIT);
+    glClear(GL_COLOR_BUFFER_BIT);
   }
   pp::CompletionCallback cb = callback_factory_.NewCallback(
       &MediaStreamVideoDemoInstance::PaintFinished);
@@ -193,30 +291,23 @@ void MediaStreamVideoDemoInstance::PaintFinished(int32_t result) {
 }
 
 GLuint MediaStreamVideoDemoInstance::CreateTexture(
-    int32_t width, int32_t height, int unit) {
+    int32_t width, int32_t height, int unit, bool rgba) {
   GLuint texture_id;
-  gles2_if_->GenTextures(context_->pp_resource(), 1, &texture_id);
+  glGenTextures(1, &texture_id);
   AssertNoGLError();
-  // Assign parameters.
-  gles2_if_->ActiveTexture(context_->pp_resource(), GL_TEXTURE0 + unit);
-  gles2_if_->BindTexture(context_->pp_resource(), GL_TEXTURE_2D, texture_id);
-  gles2_if_->TexParameteri(
-      context_->pp_resource(), GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
-      GL_NEAREST);
-  gles2_if_->TexParameteri(
-      context_->pp_resource(), GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
-      GL_NEAREST);
-  gles2_if_->TexParameterf(
-      context_->pp_resource(), GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,
-      GL_CLAMP_TO_EDGE);
-  gles2_if_->TexParameterf(
-      context_->pp_resource(), GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,
-      GL_CLAMP_TO_EDGE);
 
+  // Assign parameters.
+  glActiveTexture(GL_TEXTURE0 + unit);
+  glBindTexture(GL_TEXTURE_2D, texture_id);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
   // Allocate texture.
-  gles2_if_->TexImage2D(
-      context_->pp_resource(), GL_TEXTURE_2D, 0, GL_LUMINANCE, width, height, 0,
-      GL_LUMINANCE, GL_UNSIGNED_BYTE, NULL);
+  glTexImage2D(GL_TEXTURE_2D, 0,
+               rgba ? GL_BGRA_EXT : GL_LUMINANCE,
+               width, height, 0,
+               rgba ? GL_BGRA_EXT : GL_LUMINANCE, GL_UNSIGNED_BYTE, NULL);
   AssertNoGLError();
   return texture_id;
 }
@@ -233,7 +324,7 @@ void MediaStreamVideoDemoInstance::CreateGLObjects() {
       "    gl_Position = a_position;       \n"
       "}";
 
-  static const char kFragmentShader[] =
+  static const char kFragmentShaderYUV[] =
       "precision mediump float;                                   \n"
       "varying vec2 v_texCoord;                                   \n"
       "uniform sampler2D y_texture;                               \n"
@@ -250,89 +341,87 @@ void MediaStreamVideoDemoInstance::CreateGLObjects() {
       "  gl_FragColor = vec4(rgb, 1.0);                           \n"
       "}";
 
-  static const float kColorMatrix[9] = {
-    1.1643828125f, 1.1643828125f, 1.1643828125f,
-    0.0f, -0.39176171875f, 2.017234375f,
-    1.59602734375f, -0.81296875f, 0.0f
-  };
+  static const char kFragmentShaderRGB[] =
+      "precision mediump float;                                   \n"
+      "varying vec2 v_texCoord;                                   \n"
+      "uniform sampler2D rgb_texture;                             \n"
+      "void main()                                                \n"
+      "{                                                          \n"
+      "  gl_FragColor = texture2D(rgb_texture, v_texCoord);       \n"
+      "}";
 
-  PP_Resource context = context_->pp_resource();
-
-  // Create shader program.
-  GLuint program = gles2_if_->CreateProgram(context);
-  CreateShader(program, GL_VERTEX_SHADER, kVertexShader, sizeof(kVertexShader));
-  CreateShader(
-      program, GL_FRAGMENT_SHADER, kFragmentShader, sizeof(kFragmentShader));
-  gles2_if_->LinkProgram(context, program);
-  gles2_if_->UseProgram(context, program);
-  gles2_if_->DeleteProgram(context, program);
-  gles2_if_->Uniform1i(
-      context, gles2_if_->GetUniformLocation(context, program, "y_texture"), 0);
-  gles2_if_->Uniform1i(
-      context, gles2_if_->GetUniformLocation(context, program, "u_texture"), 1);
-  gles2_if_->Uniform1i(
-      context, gles2_if_->GetUniformLocation(context, program, "v_texture"), 2);
-  gles2_if_->UniformMatrix3fv(
-      context,
-      gles2_if_->GetUniformLocation(context, program, "color_matrix"),
-      1, GL_FALSE, kColorMatrix);
+  // Create shader programs.
+  program_yuv_ = glCreateProgram();
+  CreateShader(program_yuv_, GL_VERTEX_SHADER, kVertexShader);
+  CreateShader(program_yuv_, GL_FRAGMENT_SHADER, kFragmentShaderYUV);
+  glLinkProgram(program_yuv_);
+  AssertNoGLError();
+
+  program_rgb_ = glCreateProgram();
+  CreateShader(program_rgb_, GL_VERTEX_SHADER, kVertexShader);
+  CreateShader(program_rgb_, GL_FRAGMENT_SHADER, kFragmentShaderRGB);
+  glLinkProgram(program_rgb_);
   AssertNoGLError();
 
   // Assign vertex positions and texture coordinates to buffers for use in
   // shader program.
   static const float kVertices[] = {
-    -1, 1, -1, -1, 1, 1, 1, -1,  // Position coordinates.
+    -1, 1, -1, -1, 0, 1, 0, -1,  // Position coordinates.
+    0, 1, 0, -1, 1, 1, 1, -1,  // Position coordinates.
+    0, 0, 0, 1, 1, 0, 1, 1,  // Texture coordinates.
     0, 0, 0, 1, 1, 0, 1, 1,  // Texture coordinates.
   };
 
-  GLuint buffer;
-  gles2_if_->GenBuffers(context, 1, &buffer);
-  gles2_if_->BindBuffer(context, GL_ARRAY_BUFFER, buffer);
-  gles2_if_->BufferData(context, GL_ARRAY_BUFFER,
-                        sizeof(kVertices), kVertices, GL_STATIC_DRAW);
-  AssertNoGLError();
-  GLint pos_location = gles2_if_->GetAttribLocation(
-      context, program, "a_position");
-  GLint tc_location = gles2_if_->GetAttribLocation(
-      context, program, "a_texCoord");
-  AssertNoGLError();
-  gles2_if_->EnableVertexAttribArray(context, pos_location);
-  gles2_if_->VertexAttribPointer(context, pos_location, 2,
-                                 GL_FLOAT, GL_FALSE, 0, 0);
-  gles2_if_->EnableVertexAttribArray(context, tc_location);
-  gles2_if_->VertexAttribPointer(
-      context, tc_location, 2, GL_FLOAT, GL_FALSE, 0,
-      static_cast<float*>(0) + 8);  // Skip position coordinates.
+  glGenBuffers(1, &buffer_);
+  glBindBuffer(GL_ARRAY_BUFFER, buffer_);
+  glBufferData(GL_ARRAY_BUFFER, sizeof(kVertices), kVertices, GL_STATIC_DRAW);
   AssertNoGLError();
 }
 
 void MediaStreamVideoDemoInstance::CreateShader(
-    GLuint program, GLenum type, const char* source, int size) {
-  PP_Resource context = context_->pp_resource();
-  GLuint shader = gles2_if_->CreateShader(context, type);
-  gles2_if_->ShaderSource(context, shader, 1, &source, &size);
-  gles2_if_->CompileShader(context, shader);
-  gles2_if_->AttachShader(context, program, shader);
-  gles2_if_->DeleteShader(context, shader);
+    GLuint program, GLenum type, const char* source) {
+  GLuint shader = glCreateShader(type);
+  GLint length = strlen(source) + 1;
+  glShaderSource(shader, 1, &source, &length);
+  glCompileShader(shader);
+  glAttachShader(program, shader);
+  glDeleteShader(shader);
 }
 
-void MediaStreamVideoDemoInstance::CreateYUVTextures() {
+void MediaStreamVideoDemoInstance::CreateTextures() {
   int32_t width = frame_size_.width();
   int32_t height = frame_size_.height();
   if (width == 0 || height == 0)
     return;
   if (texture_y_)
-    gles2_if_->DeleteTextures(context_->pp_resource(), 1, &texture_y_);
+    glDeleteTextures(1, &texture_y_);
   if (texture_u_)
-    gles2_if_->DeleteTextures(context_->pp_resource(), 1, &texture_u_);
+    glDeleteTextures(1, &texture_u_);
   if (texture_v_)
-    gles2_if_->DeleteTextures(context_->pp_resource(), 1, &texture_v_);
-  texture_y_ = CreateTexture(width, height, 0);
+    glDeleteTextures(1, &texture_v_);
+  if (texture_rgb_)
+    glDeleteTextures(1, &texture_rgb_);
+  texture_y_ = CreateTexture(width, height, 0, false);
+
+  texture_u_ = CreateTexture(width / 2, height / 2, 1, false);
+  texture_v_ = CreateTexture(width / 2, height / 2, 2, false);
+  texture_rgb_ = CreateTexture(width, height, 3, true);
+}
 
-  width /= 2;
-  height /= 2;
-  texture_u_ = CreateTexture(width, height, 1);
-  texture_v_ = CreateTexture(width, height, 2);
+void MediaStreamVideoDemoInstance::ConfigureTrack() {
+  const int32_t attrib_list[] = {
+      PP_MEDIASTREAMVIDEOTRACK_ATTRIB_FORMAT, attrib_format_,
+      PP_MEDIASTREAMVIDEOTRACK_ATTRIB_WIDTH, attrib_width_,
+      PP_MEDIASTREAMVIDEOTRACK_ATTRIB_HEIGHT, attrib_height_,
+      PP_MEDIASTREAMVIDEOTRACK_ATTRIB_NONE
+    };
+  video_track_.Configure(attrib_list, callback_factory_.NewCallback(
+        &MediaStreamVideoDemoInstance::OnConfigure));
+}
+
+void MediaStreamVideoDemoInstance::OnConfigure(int32_t result) {
+  video_track_.GetFrame(callback_factory_.NewCallbackWithOutput(
+      &MediaStreamVideoDemoInstance::OnGetFrame));
 }
 
 void MediaStreamVideoDemoInstance::OnGetFrame(
@@ -341,33 +430,39 @@ void MediaStreamVideoDemoInstance::OnGetFrame(
     return;
   const char* data = static_cast<const char*>(frame.GetDataBuffer());
   pp::Size size;
-  PP_DCHECK(frame.GetSize(&size));
+  frame.GetSize(&size);
+
   if (size != frame_size_) {
     frame_size_ = size;
-    CreateYUVTextures();
+    CreateTextures();
   }
 
+  is_bgra_ = (frame.GetFormat() == PP_VIDEOFRAME_FORMAT_BGRA);
+
   int32_t width = frame_size_.width();
   int32_t height = frame_size_.height();
-  gles2_if_->ActiveTexture(context_->pp_resource(), GL_TEXTURE0);
-  gles2_if_->TexSubImage2D(
-      context_->pp_resource(), GL_TEXTURE_2D, 0, 0, 0, width, height,
-      GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
-
-  data += width * height;
-  width /= 2;
-  height /= 2;
-
-  gles2_if_->ActiveTexture(context_->pp_resource(), GL_TEXTURE1);
-  gles2_if_->TexSubImage2D(
-      context_->pp_resource(), GL_TEXTURE_2D, 0, 0, 0, width, height,
-      GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
-
-  data += width * height;
-  gles2_if_->ActiveTexture(context_->pp_resource(), GL_TEXTURE2);
-  gles2_if_->TexSubImage2D(
-      context_->pp_resource(), GL_TEXTURE_2D, 0, 0, 0, width, height,
-      GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
+  if (!is_bgra_) {
+    glActiveTexture(GL_TEXTURE0);
+    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height,
+                    GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
+
+    data += width * height;
+    width /= 2;
+    height /= 2;
+
+    glActiveTexture(GL_TEXTURE1);
+    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height,
+                    GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
+
+    data += width * height;
+    glActiveTexture(GL_TEXTURE2);
+    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height,
+                    GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
+  } else {
+    glActiveTexture(GL_TEXTURE3);
+    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height,
+                    GL_BGRA_EXT, GL_UNSIGNED_BYTE, data);
+  }
 
   if (is_painting_)
     needs_paint_ = true;
@@ -375,8 +470,13 @@ void MediaStreamVideoDemoInstance::OnGetFrame(
     Render();
 
   video_track_.RecycleFrame(frame);
-  video_track_.GetFrame(callback_factory_.NewCallbackWithOutput(
-      &MediaStreamVideoDemoInstance::OnGetFrame));
+  if (need_config_) {
+    ConfigureTrack();
+    need_config_ = false;
+  } else {
+    video_track_.GetFrame(callback_factory_.NewCallbackWithOutput(
+        &MediaStreamVideoDemoInstance::OnGetFrame));
+  }
 }
 
 pp::Instance* MediaStreamVideoModule::CreateInstance(PP_Instance instance) {