зеркало из https://github.com/mozilla/pjs.git
308 строки
9.1 KiB
C++
308 строки
9.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla code.
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*
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* The Initial Developer of the Original Code is the Mozilla Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2007
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Chris Double <chris.double@double.co.nz>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsMediaDecoder.h"
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#include "nsMediaStream.h"
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#include "prlog.h"
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#include "prmem.h"
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#include "nsIFrame.h"
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#include "nsIDocument.h"
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#include "nsThreadUtils.h"
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#include "nsIDOMHTMLMediaElement.h"
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#include "nsNetUtil.h"
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#include "nsHTMLMediaElement.h"
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#include "gfxContext.h"
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#include "nsPresContext.h"
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#include "nsDOMError.h"
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#include "nsDisplayList.h"
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#include "nsSVGEffects.h"
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using namespace mozilla;
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// Number of milliseconds between progress events as defined by spec
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#define PROGRESS_MS 350
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// Number of milliseconds of no data before a stall event is fired as defined by spec
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#define STALL_MS 3000
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// Number of estimated seconds worth of data we need to have buffered
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// ahead of the current playback position before we allow the media decoder
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// to report that it can play through the entire media without the decode
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// catching up with the download. Having this margin make the
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// nsMediaDecoder::CanPlayThrough() calculation more stable in the case of
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// fluctuating bitrates.
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#define CAN_PLAY_THROUGH_MARGIN 10
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nsMediaDecoder::nsMediaDecoder() :
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mElement(0),
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mRGBWidth(-1),
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mRGBHeight(-1),
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mVideoUpdateLock("nsMediaDecoder.mVideoUpdateLock"),
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mFrameBufferLength(0),
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mPinnedForSeek(PR_FALSE),
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mSizeChanged(PR_FALSE),
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mImageContainerSizeChanged(PR_FALSE),
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mShuttingDown(PR_FALSE)
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{
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MOZ_COUNT_CTOR(nsMediaDecoder);
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}
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nsMediaDecoder::~nsMediaDecoder()
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{
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MOZ_COUNT_DTOR(nsMediaDecoder);
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}
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PRBool nsMediaDecoder::Init(nsHTMLMediaElement* aElement)
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{
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mElement = aElement;
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return PR_TRUE;
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}
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void nsMediaDecoder::Shutdown()
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{
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StopProgress();
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mElement = nsnull;
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}
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nsHTMLMediaElement* nsMediaDecoder::GetMediaElement()
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{
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return mElement;
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}
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nsresult nsMediaDecoder::RequestFrameBufferLength(PRUint32 aLength)
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{
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if (aLength < FRAMEBUFFER_LENGTH_MIN || aLength > FRAMEBUFFER_LENGTH_MAX) {
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return NS_ERROR_DOM_INDEX_SIZE_ERR;
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}
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mFrameBufferLength = aLength;
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return NS_OK;
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}
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void nsMediaDecoder::Invalidate()
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{
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if (!mElement)
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return;
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nsIFrame* frame = mElement->GetPrimaryFrame();
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PRBool invalidateFrame = PR_FALSE;
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{
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MutexAutoLock lock(mVideoUpdateLock);
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// Get mImageContainerSizeChanged while holding the lock.
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invalidateFrame = mImageContainerSizeChanged;
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mImageContainerSizeChanged = PR_FALSE;
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if (mSizeChanged) {
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mElement->UpdateMediaSize(nsIntSize(mRGBWidth, mRGBHeight));
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mSizeChanged = PR_FALSE;
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if (frame) {
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nsPresContext* presContext = frame->PresContext();
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nsIPresShell *presShell = presContext->PresShell();
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presShell->FrameNeedsReflow(frame,
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nsIPresShell::eStyleChange,
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NS_FRAME_IS_DIRTY);
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}
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}
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}
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if (frame) {
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nsRect contentRect = frame->GetContentRect() - frame->GetPosition();
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if (invalidateFrame) {
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frame->Invalidate(contentRect);
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} else {
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frame->InvalidateLayer(contentRect, nsDisplayItem::TYPE_VIDEO);
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}
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}
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nsSVGEffects::InvalidateDirectRenderingObservers(mElement);
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}
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static void ProgressCallback(nsITimer* aTimer, void* aClosure)
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{
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nsMediaDecoder* decoder = static_cast<nsMediaDecoder*>(aClosure);
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decoder->Progress(PR_TRUE);
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}
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void nsMediaDecoder::Progress(PRBool aTimer)
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{
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if (!mElement)
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return;
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TimeStamp now = TimeStamp::Now();
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if (!aTimer) {
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mDataTime = now;
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}
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// If PROGRESS_MS has passed since the last progress event fired and more
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// data has arrived since then, fire another progress event.
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if ((mProgressTime.IsNull() ||
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now - mProgressTime >= TimeDuration::FromMilliseconds(PROGRESS_MS)) &&
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!mDataTime.IsNull() &&
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now - mDataTime <= TimeDuration::FromMilliseconds(PROGRESS_MS)) {
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mElement->DispatchAsyncEvent(NS_LITERAL_STRING("progress"));
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mProgressTime = now;
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}
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if (!mDataTime.IsNull() &&
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now - mDataTime >= TimeDuration::FromMilliseconds(STALL_MS)) {
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mElement->DownloadStalled();
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// Null it out
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mDataTime = TimeStamp();
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}
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}
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nsresult nsMediaDecoder::StartProgress()
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{
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if (mProgressTimer)
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return NS_OK;
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mProgressTimer = do_CreateInstance("@mozilla.org/timer;1");
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return mProgressTimer->InitWithFuncCallback(ProgressCallback,
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this,
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PROGRESS_MS,
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nsITimer::TYPE_REPEATING_SLACK);
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}
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nsresult nsMediaDecoder::StopProgress()
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{
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if (!mProgressTimer)
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return NS_OK;
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nsresult rv = mProgressTimer->Cancel();
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mProgressTimer = nsnull;
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return rv;
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}
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void nsMediaDecoder::FireTimeUpdate()
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{
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if (!mElement)
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return;
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mElement->FireTimeUpdate(PR_TRUE);
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}
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void nsMediaDecoder::SetVideoData(const gfxIntSize& aSize,
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Image* aImage,
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TimeStamp aTarget)
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{
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MutexAutoLock lock(mVideoUpdateLock);
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if (mRGBWidth != aSize.width || mRGBHeight != aSize.height) {
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mRGBWidth = aSize.width;
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mRGBHeight = aSize.height;
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mSizeChanged = PR_TRUE;
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}
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if (mImageContainer && aImage) {
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gfxIntSize oldFrameSize = mImageContainer->GetCurrentSize();
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TimeStamp paintTime = mImageContainer->GetPaintTime();
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if (!paintTime.IsNull() && !mPaintTarget.IsNull()) {
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mPaintDelay = paintTime - mPaintTarget;
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}
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mImageContainer->SetCurrentImage(aImage);
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gfxIntSize newFrameSize = mImageContainer->GetCurrentSize();
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if (oldFrameSize != newFrameSize) {
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mImageContainerSizeChanged = PR_TRUE;
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}
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}
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mPaintTarget = aTarget;
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}
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double nsMediaDecoder::GetFrameDelay()
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{
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MutexAutoLock lock(mVideoUpdateLock);
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return mPaintDelay.ToSeconds();
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}
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void nsMediaDecoder::PinForSeek()
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{
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nsMediaStream* stream = GetCurrentStream();
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if (!stream || mPinnedForSeek) {
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return;
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}
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mPinnedForSeek = PR_TRUE;
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stream->Pin();
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}
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void nsMediaDecoder::UnpinForSeek()
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{
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nsMediaStream* stream = GetCurrentStream();
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if (!stream || !mPinnedForSeek) {
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return;
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}
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mPinnedForSeek = PR_FALSE;
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stream->Unpin();
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}
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PRBool nsMediaDecoder::CanPlayThrough()
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{
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Statistics stats = GetStatistics();
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if (!stats.mDownloadRateReliable || !stats.mPlaybackRateReliable) {
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return PR_FALSE;
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}
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PRInt64 bytesToDownload = stats.mTotalBytes - stats.mDownloadPosition;
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PRInt64 bytesToPlayback = stats.mTotalBytes - stats.mPlaybackPosition;
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double timeToDownload = bytesToDownload / stats.mDownloadRate;
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double timeToPlay = bytesToPlayback / stats.mPlaybackRate;
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if (timeToDownload > timeToPlay) {
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// Estimated time to download is greater than the estimated time to play.
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// We probably can't play through without having to stop to buffer.
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return PR_FALSE;
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}
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// Estimated time to download is less than the estimated time to play.
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// We can probably play through without having to buffer, but ensure that
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// we've got a reasonable amount of data buffered after the current
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// playback position, so that if the bitrate of the media fluctuates, or if
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// our download rate or decode rate estimation is otherwise inaccurate,
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// we don't suddenly discover that we need to buffer. This is particularly
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// required near the start of the media, when not much data is downloaded.
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PRInt64 readAheadMargin =
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static_cast<PRInt64>(stats.mPlaybackRate * CAN_PLAY_THROUGH_MARGIN);
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return stats.mTotalBytes == stats.mDownloadPosition ||
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stats.mDownloadPosition > stats.mPlaybackPosition + readAheadMargin;
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}
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