gecko/dom/media/mediasource/SourceBufferResource.cpp

200 lines
5.5 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "SourceBufferResource.h"
#include <algorithm>
#include "nsISeekableStream.h"
#include "nsISupports.h"
#include "prlog.h"
#ifdef PR_LOGGING
PRLogModuleInfo* GetSourceBufferResourceLog()
{
static PRLogModuleInfo* sLogModule;
if (!sLogModule) {
sLogModule = PR_NewLogModule("SourceBufferResource");
}
return sLogModule;
}
#define SBR_DEBUG(...) PR_LOG(GetSourceBufferResourceLog(), PR_LOG_DEBUG, (__VA_ARGS__))
#define SBR_DEBUGV(...) PR_LOG(GetSourceBufferResourceLog(), PR_LOG_DEBUG+1, (__VA_ARGS__))
#else
#define SBR_DEBUG(...)
#define SBR_DEBUGV(...)
#endif
namespace mozilla {
nsresult
SourceBufferResource::Close()
{
ReentrantMonitorAutoEnter mon(mMonitor);
SBR_DEBUG("SourceBufferResource(%p)::Close", this);
//MOZ_ASSERT(!mClosed);
mClosed = true;
mon.NotifyAll();
return NS_OK;
}
nsresult
SourceBufferResource::Read(char* aBuffer, uint32_t aCount, uint32_t* aBytes)
{
SBR_DEBUGV("SourceBufferResource(%p)::Read(aBuffer=%p, aCount=%u, aBytes=%p)",
this, aBytes, aCount, aBytes);
ReentrantMonitorAutoEnter mon(mMonitor);
bool blockingRead = !!aBytes;
while (blockingRead &&
!mEnded &&
mOffset + aCount > static_cast<uint64_t>(GetLength())) {
SBR_DEBUGV("SourceBufferResource(%p)::Read waiting for data", this);
mon.Wait();
}
uint32_t available = GetLength() - mOffset;
uint32_t count = std::min(aCount, available);
SBR_DEBUGV("SourceBufferResource(%p)::Read() mOffset=%llu GetLength()=%u available=%u count=%u mEnded=%d",
this, mOffset, GetLength(), available, count, mEnded);
if (available == 0) {
SBR_DEBUGV("SourceBufferResource(%p)::Read() reached EOF", this);
*aBytes = 0;
return NS_OK;
}
mInputBuffer.CopyData(mOffset, count, aBuffer);
*aBytes = count;
mOffset += count;
return NS_OK;
}
nsresult
SourceBufferResource::ReadAt(int64_t aOffset, char* aBuffer, uint32_t aCount, uint32_t* aBytes)
{
SBR_DEBUG("SourceBufferResource(%p)::ReadAt(aOffset=%lld, aBuffer=%p, aCount=%u, aBytes=%p)",
this, aOffset, aBytes, aCount, aBytes);
ReentrantMonitorAutoEnter mon(mMonitor);
nsresult rv = SeekInternal(aOffset);
if (NS_FAILED(rv)) {
return rv;
}
return Read(aBuffer, aCount, aBytes);
}
nsresult
SourceBufferResource::Seek(int32_t aWhence, int64_t aOffset)
{
SBR_DEBUG("SourceBufferResource(%p)::Seek(aWhence=%d, aOffset=%lld)", this, aWhence, aOffset);
ReentrantMonitorAutoEnter mon(mMonitor);
int64_t newOffset = mOffset;
switch (aWhence) {
case nsISeekableStream::NS_SEEK_END:
newOffset = GetLength() - aOffset;
break;
case nsISeekableStream::NS_SEEK_CUR:
newOffset += aOffset;
break;
case nsISeekableStream::NS_SEEK_SET:
newOffset = aOffset;
break;
}
SBR_DEBUGV("SourceBufferResource(%p)::Seek() newOffset=%lld GetOffset()=%llu GetLength()=%llu)",
this, newOffset, mInputBuffer.GetOffset(), GetLength());
nsresult rv = SeekInternal(newOffset);
mon.NotifyAll();
return rv;
}
nsresult
SourceBufferResource::SeekInternal(int64_t aOffset)
{
mMonitor.AssertCurrentThreadIn();
if (mClosed ||
aOffset < 0 ||
uint64_t(aOffset) < mInputBuffer.GetOffset() ||
aOffset > GetLength()) {
return NS_ERROR_FAILURE;
}
mOffset = aOffset;
return NS_OK;
}
nsresult
SourceBufferResource::ReadFromCache(char* aBuffer, int64_t aOffset, uint32_t aCount)
{
SBR_DEBUG("SourceBufferResource(%p)::ReadFromCache(aBuffer=%p, aOffset=%lld, aCount=%u)",
this, aBuffer, aOffset, aCount);
ReentrantMonitorAutoEnter mon(mMonitor);
int64_t oldOffset = mOffset;
uint32_t bytesRead;
nsresult rv = ReadAt(aOffset, aBuffer, aCount, &bytesRead);
mOffset = oldOffset;
return rv;
}
uint32_t
SourceBufferResource::EvictData(uint32_t aThreshold)
{
SBR_DEBUG("SourceBufferResource(%p)::EvictData(aThreshold=%u)", this, aThreshold);
ReentrantMonitorAutoEnter mon(mMonitor);
return mInputBuffer.Evict(mOffset, aThreshold);
}
void
SourceBufferResource::EvictBefore(uint64_t aOffset)
{
SBR_DEBUG("SourceBufferResource(%p)::EvictBefore(aOffset=%llu)", this, aOffset);
ReentrantMonitorAutoEnter mon(mMonitor);
// If aOffset is past the current playback offset we don't evict.
if (aOffset < mOffset) {
mInputBuffer.Evict(aOffset, 0);
}
}
void
SourceBufferResource::AppendData(const uint8_t* aData, uint32_t aLength)
{
SBR_DEBUG("SourceBufferResource(%p)::AppendData(aData=%p, aLength=%u)", this, aData, aLength);
ReentrantMonitorAutoEnter mon(mMonitor);
mInputBuffer.AppendItem(aData, aLength);
mon.NotifyAll();
}
void
SourceBufferResource::Ended()
{
SBR_DEBUG("SourceBufferResource(%p)::Ended()", this);
ReentrantMonitorAutoEnter mon(mMonitor);
mEnded = true;
mon.NotifyAll();
}
SourceBufferResource::~SourceBufferResource()
{
SBR_DEBUG("SourceBufferResource(%p)::~SourceBufferResource()", this);
MOZ_COUNT_DTOR(SourceBufferResource);
}
SourceBufferResource::SourceBufferResource(const nsACString& aType)
: mType(aType)
, mMonitor("mozilla::SourceBufferResource::mMonitor")
, mOffset(0)
, mClosed(false)
, mEnded(false)
{
SBR_DEBUG("SourceBufferResource(%p)::SourceBufferResource(aType=%s)",
this, nsCString(aType).get());
MOZ_COUNT_CTOR(SourceBufferResource);
}
} // namespace mozilla