Added FakeGlVideoDecodeEngine to exercise the IPC protocol for hardware video decoding

chrome/gpu/media/fake_gl_video_decode_engine.cc

+// Copyright (c) 2010 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 "chrome/gpu/media/fake_gl_video_decode_engine.h"
+
+#include "app/gfx/gl/gl_bindings.h"
+
+FakeGlVideoDecodeEngine::FakeGlVideoDecodeEngine()
+    : width_(0),
+      height_(0),
+      handler_(NULL) {
+}
+
+FakeGlVideoDecodeEngine::~FakeGlVideoDecodeEngine() {
+}
+
+void FakeGlVideoDecodeEngine::Initialize(
+    MessageLoop* message_loop,
+    media::VideoDecodeEngine::EventHandler* event_handler,
+    const media::VideoCodecConfig& config) {
+  handler_ = event_handler;
+  width_ = config.width;
+  height_ = config.height;
+
+  media::VideoCodecInfo info;
+  info.success = true;
+  info.provides_buffers = true;
+  info.stream_info.surface_format = media::VideoFrame::RGBA;
+  info.stream_info.surface_type = media::VideoFrame::TYPE_GL_TEXTURE;
+  info.stream_info.surface_width = width_;
+  info.stream_info.surface_height = height_;
+
+  // TODO(hclam): When we have VideoDecodeContext we should use it to allocate
+  // video frames.
+  handler_->OnInitializeComplete(info);
+}
+
+void FakeGlVideoDecodeEngine::Uninitialize() {
+  handler_->OnUninitializeComplete();
+}
+
+void FakeGlVideoDecodeEngine::Flush() {
+  handler_->OnFlushComplete();
+}
+
+void FakeGlVideoDecodeEngine::Seek() {
+  handler_->OnSeekComplete();
+}
+
+void FakeGlVideoDecodeEngine::ConsumeVideoSample(
+    scoped_refptr<media::Buffer> buffer) {
+  // Don't care.
+}
+
+void FakeGlVideoDecodeEngine::ProduceVideoFrame(
+    scoped_refptr<media::VideoFrame> frame) {
+  // Fake that we need some buffer.
+  handler_->ProduceVideoSample(NULL);
+
+  int size = width_ * height_ * 4;
+  scoped_array<uint8> buffer(new uint8[size]);
+  memset(buffer.get(), 0, size);
+
+  uint8* row = buffer.get();
+  static int seed = 0;

[scherkus (not reviewing), 2010/09/13 07:19:23]

just use a uint8 and let it overflow?

but to be honest I don't really care -- as long as pixels go up on the screen :)

+
+  for (int y = 0; y < height_; ++y) {
+    int offset = y % 3;
+    for (int x = 0; x < width_; ++x) {
+      row[x * 4 + offset] = seed++;
+      seed &= 255;
+    }
+    row += width_ * 4;
+  }
+  ++seed;
+
+  // Assume we are in the right context and then upload the content to the
+  // texture.
+  glBindTexture(GL_TEXTURE_2D,
+                frame->gl_texture(media::VideoFrame::kRGBPlane));
+  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width_, height_, 0, GL_RGBA,
+               GL_UNSIGNED_BYTE, buffer.get());
+
+  // We have done generating data to the frame so give it to the handler.
+  // TODO(hclam): Advance the timestamp every time we call this method.
+  handler_->ConsumeVideoFrame(frame);
+}