webkit/media/simple_video_frame_provider.cc

   1 // Copyright (c) 2012 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 "webkit/media/simple_video_frame_provider.h"
   6
   7 #include "base/bind.h"
   8 #include "base/location.h"
   9 #include "base/message_loop_proxy.h"
  10 #include "media/base/video_frame.h"
  11
  12 namespace webkit_media {
  13
  14 SimpleVideoFrameProvider::SimpleVideoFrameProvider(
  15     const gfx::Size& size,
  16     const base::TimeDelta& frame_duration,
  17     const base::Closure& error_cb,
  18     const VideoFrameProvider::RepaintCB& repaint_cb)
  19     : message_loop_proxy_(base::MessageLoopProxy::current()),
  20       size_(size),
  21       state_(kStopped),
  22       frame_duration_(frame_duration),
  23       error_cb_(error_cb),
  24       repaint_cb_(repaint_cb) {
  25 }
  26
  27 SimpleVideoFrameProvider::~SimpleVideoFrameProvider() {}
  28
  29 void SimpleVideoFrameProvider::Start() {
  30   DVLOG(1) << "SimpleVideoFrameProvider::Start";
  31   DCHECK(message_loop_proxy_->BelongsToCurrentThread());
  32   state_ = kStarted;
  33   message_loop_proxy_->PostTask(
  34       FROM_HERE,
  35       base::Bind(&SimpleVideoFrameProvider::GenerateFrame, this));
  36 }
  37
  38 void SimpleVideoFrameProvider::Stop() {
  39   DVLOG(1) << "SimpleVideoFrameProvider::Stop";
  40   DCHECK(message_loop_proxy_->BelongsToCurrentThread());
  41   state_ = kStopped;
  42 }
  43
  44 void SimpleVideoFrameProvider::Play() {
  45   DVLOG(1) << "SimpleVideoFrameProvider::Play";
  46   DCHECK(message_loop_proxy_->BelongsToCurrentThread());
  47   if (state_ == kPaused)
  48     state_ = kStarted;
  49 }
  50
  51 void SimpleVideoFrameProvider::Pause() {
  52   DVLOG(1) << "SimpleVideoFrameProvider::Pause";
  53   DCHECK(message_loop_proxy_->BelongsToCurrentThread());
  54   if (state_ == kStarted)
  55     state_ = kPaused;
  56 }
  57
  58 void SimpleVideoFrameProvider::GenerateFrame() {
  59   DVLOG(1) << "SimpleVideoFrameProvider::GenerateFrame";
  60   DCHECK(message_loop_proxy_->BelongsToCurrentThread());
  61   if (state_ == kStopped)
  62     return;
  63
  64   if (state_ == kStarted) {
  65     // Always allocate a new frame filled with white color.
  66     scoped_refptr<media::VideoFrame> video_frame =
  67         media::VideoFrame::CreateColorFrame(
  68             size_, 255, 128, 128, current_time_);
  69
  70     // TODO(wjia): set pixel data to pre-defined patterns if it's desired to
  71     // verify frame content.
  72
  73     repaint_cb_.Run(video_frame);
  74   }
  75
  76   current_time_ += frame_duration_;
  77   message_loop_proxy_->PostDelayedTask(
  78       FROM_HERE,
  79       base::Bind(&SimpleVideoFrameProvider::GenerateFrame, this),
  80       frame_duration_);
  81 }
  82
  83 }  // namespace webkit_media