mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-10 11:54:40 +00:00
214 lines
6.0 KiB
C++
214 lines
6.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "SourceBufferResource.h"
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#include <algorithm>
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#include "nsISeekableStream.h"
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#include "nsISupports.h"
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#include "mozilla/Logging.h"
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#include "MediaData.h"
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mozilla::LogModule* GetSourceBufferResourceLog()
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{
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static mozilla::LazyLogModule sLogModule("SourceBufferResource");
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return sLogModule;
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}
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#define SBR_DEBUG(arg, ...) MOZ_LOG(GetSourceBufferResourceLog(), mozilla::LogLevel::Debug, ("SourceBufferResource(%p:%s)::%s: " arg, this, mType.get(), __func__, ##__VA_ARGS__))
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#define SBR_DEBUGV(arg, ...) MOZ_LOG(GetSourceBufferResourceLog(), mozilla::LogLevel::Verbose, ("SourceBufferResource(%p:%s)::%s: " arg, this, mType.get(), __func__, ##__VA_ARGS__))
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namespace mozilla {
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nsresult
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SourceBufferResource::Close()
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{
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ReentrantMonitorAutoEnter mon(mMonitor);
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SBR_DEBUG("Close");
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//MOZ_ASSERT(!mClosed);
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mClosed = true;
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mon.NotifyAll();
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return NS_OK;
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}
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nsresult
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SourceBufferResource::ReadInternal(char* aBuffer, uint32_t aCount, uint32_t* aBytes, bool aMayBlock)
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{
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mMonitor.AssertCurrentThreadIn();
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MOZ_ASSERT_IF(!aMayBlock, aBytes);
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// Cache the offset for the read in case mOffset changes while waiting on the
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// monitor below. It's basically impossible to implement these API semantics
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// sanely. :-(
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uint64_t readOffset = mOffset;
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while (aMayBlock &&
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!mEnded &&
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readOffset + aCount > static_cast<uint64_t>(GetLength())) {
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SBR_DEBUGV("waiting for data");
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mMonitor.Wait();
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// The callers of this function should have checked this, but it's
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// possible that we had an eviction while waiting on the monitor.
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if (readOffset < mInputBuffer.GetOffset()) {
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return NS_ERROR_FAILURE;
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}
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}
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uint32_t available = GetLength() - readOffset;
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uint32_t count = std::min(aCount, available);
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SBR_DEBUGV("readOffset=%llu GetLength()=%u available=%u count=%u mEnded=%d",
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readOffset, GetLength(), available, count, mEnded);
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if (available == 0) {
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SBR_DEBUGV("reached EOF");
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*aBytes = 0;
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return NS_OK;
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}
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mInputBuffer.CopyData(readOffset, count, aBuffer);
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*aBytes = count;
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// From IRC:
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// <@cpearce>bholley: *this* is why there should only every be a ReadAt() and
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// no Read() on a Stream abstraction! there's no good answer, they all suck.
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mOffset = readOffset + count;
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return NS_OK;
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}
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nsresult
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SourceBufferResource::ReadAt(int64_t aOffset, char* aBuffer, uint32_t aCount, uint32_t* aBytes)
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{
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SBR_DEBUG("ReadAt(aOffset=%lld, aBuffer=%p, aCount=%u, aBytes=%p)",
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aOffset, aBytes, aCount, aBytes);
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ReentrantMonitorAutoEnter mon(mMonitor);
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return ReadAtInternal(aOffset, aBuffer, aCount, aBytes, /* aMayBlock = */ true);
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}
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nsresult
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SourceBufferResource::ReadAtInternal(int64_t aOffset, char* aBuffer, uint32_t aCount, uint32_t* aBytes,
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bool aMayBlock)
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{
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mMonitor.AssertCurrentThreadIn();
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nsresult rv = SeekInternal(aOffset);
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if (NS_FAILED(rv)) {
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return rv;
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}
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return ReadInternal(aBuffer, aCount, aBytes, aMayBlock);
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}
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nsresult
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SourceBufferResource::SeekInternal(int64_t aOffset)
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{
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mMonitor.AssertCurrentThreadIn();
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if (mClosed ||
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aOffset < 0 ||
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uint64_t(aOffset) < mInputBuffer.GetOffset() ||
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aOffset > GetLength()) {
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return NS_ERROR_FAILURE;
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}
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mOffset = aOffset;
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return NS_OK;
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}
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nsresult
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SourceBufferResource::ReadFromCache(char* aBuffer, int64_t aOffset, uint32_t aCount)
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{
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SBR_DEBUG("ReadFromCache(aBuffer=%p, aOffset=%lld, aCount=%u)",
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aBuffer, aOffset, aCount);
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ReentrantMonitorAutoEnter mon(mMonitor);
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uint32_t bytesRead;
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int64_t oldOffset = mOffset;
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nsresult rv = ReadAtInternal(aOffset, aBuffer, aCount, &bytesRead, /* aMayBlock = */ false);
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mOffset = oldOffset; // ReadFromCache isn't supposed to affect the seek position.
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NS_ENSURE_SUCCESS(rv, rv);
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// ReadFromCache return failure if not all the data is cached.
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return bytesRead == aCount ? NS_OK : NS_ERROR_FAILURE;
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}
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uint32_t
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SourceBufferResource::EvictData(uint64_t aPlaybackOffset, uint32_t aThreshold,
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ErrorResult& aRv)
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{
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SBR_DEBUG("EvictData(aPlaybackOffset=%llu,"
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"aThreshold=%u)", aPlaybackOffset, aThreshold);
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ReentrantMonitorAutoEnter mon(mMonitor);
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uint32_t result = mInputBuffer.Evict(aPlaybackOffset, aThreshold, aRv);
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if (result > 0) {
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// Wake up any waiting threads in case a ReadInternal call
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// is now invalid.
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mon.NotifyAll();
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}
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return result;
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}
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void
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SourceBufferResource::EvictBefore(uint64_t aOffset, ErrorResult& aRv)
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{
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SBR_DEBUG("EvictBefore(aOffset=%llu)", aOffset);
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ReentrantMonitorAutoEnter mon(mMonitor);
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// If aOffset is past the current playback offset we don't evict.
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if (aOffset < mOffset) {
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mInputBuffer.EvictBefore(aOffset, aRv);
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}
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// Wake up any waiting threads in case a ReadInternal call
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// is now invalid.
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mon.NotifyAll();
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}
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uint32_t
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SourceBufferResource::EvictAll()
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{
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SBR_DEBUG("EvictAll()");
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ReentrantMonitorAutoEnter mon(mMonitor);
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return mInputBuffer.EvictAll();
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}
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void
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SourceBufferResource::AppendData(MediaByteBuffer* aData)
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{
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SBR_DEBUG("AppendData(aData=%p, aLength=%u)",
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aData->Elements(), aData->Length());
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ReentrantMonitorAutoEnter mon(mMonitor);
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mInputBuffer.AppendItem(aData);
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mEnded = false;
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mon.NotifyAll();
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}
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void
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SourceBufferResource::Ended()
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{
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SBR_DEBUG("");
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ReentrantMonitorAutoEnter mon(mMonitor);
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mEnded = true;
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mon.NotifyAll();
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}
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SourceBufferResource::~SourceBufferResource()
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{
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SBR_DEBUG("");
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MOZ_COUNT_DTOR(SourceBufferResource);
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}
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SourceBufferResource::SourceBufferResource(const nsACString& aType)
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: mType(aType)
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, mMonitor("mozilla::SourceBufferResource::mMonitor")
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, mOffset(0)
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, mClosed(false)
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, mEnded(false)
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{
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SBR_DEBUG("");
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MOZ_COUNT_CTOR(SourceBufferResource);
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}
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#undef SBR_DEBUG
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#undef SBR_DEBUGV
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} // namespace mozilla
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