// Copyright (c) 2012 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 "webkit/media/webmediaplayer_proxy.h"

#include "base/bind.h"
#include "base/logging.h"
#include "base/message_loop_proxy.h"
#include "media/base/pipeline_status.h"
#include "media/filters/video_renderer_base.h"
#include "webkit/media/webmediaplayer_impl.h"

using media::PipelineStatus;

namespace webkit_media {

// Limits the maximum outstanding repaints posted on render thread.
// This number of 50 is a guess, it does not take too much memory on the task
// queue but gives up a pretty good latency on repaint.
static const int kMaxOutstandingRepaints = 50;

WebMediaPlayerProxy::WebMediaPlayerProxy(
    const scoped_refptr<base::MessageLoopProxy>& render_loop,
    WebMediaPlayerImpl* webmediaplayer)
    : render_loop_(render_loop),
      webmediaplayer_(webmediaplayer),
      outstanding_repaints_(0) {
  DCHECK(render_loop_);
  DCHECK(webmediaplayer_);
}

WebMediaPlayerProxy::~WebMediaPlayerProxy() {
  Detach();
}

void WebMediaPlayerProxy::Repaint() {
  base::AutoLock auto_lock(lock_);
  if (outstanding_repaints_ < kMaxOutstandingRepaints) {
    ++outstanding_repaints_;

    render_loop_->PostTask(FROM_HERE, base::Bind(
        &WebMediaPlayerProxy::RepaintTask, this));
  }
}

void WebMediaPlayerProxy::Paint(SkCanvas* canvas,
                                const gfx::Rect& dest_rect,
                                uint8_t alpha) {
  DCHECK(render_loop_->BelongsToCurrentThread());
  if (frame_provider_) {
    scoped_refptr<media::VideoFrame> video_frame;
    frame_provider_->GetCurrentFrame(&video_frame);
    video_renderer_.Paint(video_frame, canvas, dest_rect, alpha);
    frame_provider_->PutCurrentFrame(video_frame);
  }
}

bool WebMediaPlayerProxy::HasSingleOrigin() {
  DCHECK(render_loop_->BelongsToCurrentThread());
  if (data_source_)
    return data_source_->HasSingleOrigin();
  return true;
}

bool WebMediaPlayerProxy::DidPassCORSAccessCheck() const {
  DCHECK(render_loop_->BelongsToCurrentThread());
  if (data_source_)
    return data_source_->DidPassCORSAccessCheck();
  return false;
}

void WebMediaPlayerProxy::AbortDataSource() {
  DCHECK(render_loop_->BelongsToCurrentThread());
  if (data_source_)
    data_source_->Abort();
}

void WebMediaPlayerProxy::Detach() {
  DCHECK(render_loop_->BelongsToCurrentThread());
  webmediaplayer_ = NULL;
  data_source_ = NULL;
  frame_provider_ = NULL;
}

void WebMediaPlayerProxy::RepaintTask() {
  DCHECK(render_loop_->BelongsToCurrentThread());
  {
    base::AutoLock auto_lock(lock_);
    --outstanding_repaints_;
    DCHECK_GE(outstanding_repaints_, 0);
  }
  if (webmediaplayer_) {
    webmediaplayer_->Repaint();
  }
}

void WebMediaPlayerProxy::GetCurrentFrame(
    scoped_refptr<media::VideoFrame>* frame_out) {
  if (frame_provider_)
    frame_provider_->GetCurrentFrame(frame_out);
}

void WebMediaPlayerProxy::PutCurrentFrame(
    scoped_refptr<media::VideoFrame> frame) {
  if (frame_provider_)
    frame_provider_->PutCurrentFrame(frame);
}

}  // namespace webkit_media