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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "ResourceQueue.h"
#include "nsDeque.h"
#include "MediaData.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/Logging.h"
#include "mozilla/Sprintf.h"
extern mozilla::LogModule* GetSourceBufferResourceLog();
#define SBR_DEBUG(arg, ...) MOZ_LOG(GetSourceBufferResourceLog(), mozilla::LogLevel::Debug, ("ResourceQueue(%p)::%s: " arg, this, __func__, ##__VA_ARGS__))
#define SBR_DEBUGV(arg, ...) MOZ_LOG(GetSourceBufferResourceLog(), mozilla::LogLevel::Verbose, ("ResourceQueue(%p)::%s: " arg, this, __func__, ##__VA_ARGS__))
namespace mozilla {
ResourceItem::ResourceItem(MediaByteBuffer* aData)
: mData(aData)
{
}
size_t
ResourceItem::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
// size including this
size_t size = aMallocSizeOf(this);
// size excluding this
size += mData->ShallowSizeOfExcludingThis(aMallocSizeOf);
return size;
}
class ResourceQueueDeallocator : public nsDequeFunctor {
void* operator() (void* aObject) override {
delete static_cast<ResourceItem*>(aObject);
return nullptr;
}
};
ResourceQueue::ResourceQueue()
: nsDeque(new ResourceQueueDeallocator())
, mLogicalLength(0)
, mOffset(0)
{
}
uint64_t
ResourceQueue::GetOffset()
{
return mOffset;
}
uint64_t
ResourceQueue::GetLength()
{
return mLogicalLength;
}
void
ResourceQueue::CopyData(uint64_t aOffset, uint32_t aCount, char* aDest)
{
uint32_t offset = 0;
uint32_t start = GetAtOffset(aOffset, &offset);
uint32_t end = std::min(GetAtOffset(aOffset + aCount, nullptr) + 1, uint32_t(GetSize()));
for (uint32_t i = start; i < end; ++i) {
ResourceItem* item = ResourceAt(i);
uint32_t bytes = std::min(aCount, uint32_t(item->mData->Length() - offset));
if (bytes != 0) {
memcpy(aDest, &(*item->mData)[offset], bytes);
offset = 0;
aCount -= bytes;
aDest += bytes;
}
}
}
void
ResourceQueue::AppendItem(MediaByteBuffer* aData)
{
mLogicalLength += aData->Length();
Push(new ResourceItem(aData));
}
uint32_t
ResourceQueue::Evict(uint64_t aOffset, uint32_t aSizeToEvict,
ErrorResult& aRv)
{
SBR_DEBUG("Evict(aOffset=%llu, aSizeToEvict=%u)",
aOffset, aSizeToEvict);
return EvictBefore(std::min(aOffset, mOffset + (uint64_t)aSizeToEvict), aRv);
}
uint32_t ResourceQueue::EvictBefore(uint64_t aOffset, ErrorResult& aRv)
{
SBR_DEBUG("EvictBefore(%llu)", aOffset);
uint32_t evicted = 0;
while (ResourceItem* item = ResourceAt(0)) {
SBR_DEBUG("item=%p length=%d offset=%llu",
item, item->mData->Length(), mOffset);
if (item->mData->Length() + mOffset >= aOffset) {
if (aOffset <= mOffset) {
break;
}
uint32_t offset = aOffset - mOffset;
mOffset += offset;
evicted += offset;
RefPtr<MediaByteBuffer> data = new MediaByteBuffer;
if (!data->AppendElements(item->mData->Elements() + offset,
item->mData->Length() - offset,
fallible)) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return 0;
}
item->mData = data;
break;
}
mOffset += item->mData->Length();
evicted += item->mData->Length();
delete PopFront();
}
return evicted;
}
uint32_t
ResourceQueue::EvictAll()
{
SBR_DEBUG("EvictAll()");
uint32_t evicted = 0;
while (ResourceItem* item = ResourceAt(0)) {
SBR_DEBUG("item=%p length=%d offset=%llu",
item, item->mData->Length(), mOffset);
mOffset += item->mData->Length();
evicted += item->mData->Length();
delete PopFront();
}
return evicted;
}
size_t
ResourceQueue::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
{
// Calculate the size of the internal deque.
size_t size = nsDeque::SizeOfExcludingThis(aMallocSizeOf);
// Sum the ResourceItems.
for (uint32_t i = 0; i < uint32_t(GetSize()); ++i) {
const ResourceItem* item = ResourceAt(i);
size += item->SizeOfIncludingThis(aMallocSizeOf);
}
return size;
}
#if defined(DEBUG)
void
ResourceQueue::Dump(const char* aPath)
{
for (uint32_t i = 0; i < uint32_t(GetSize()); ++i) {
ResourceItem* item = ResourceAt(i);
char buf[255];
SprintfLiteral(buf, "%s/%08u.bin", aPath, i);
FILE* fp = fopen(buf, "wb");
if (!fp) {
return;
}
fwrite(item->mData->Elements(), item->mData->Length(), 1, fp);
fclose(fp);
}
}
#endif
ResourceItem*
ResourceQueue::ResourceAt(uint32_t aIndex) const
{
return static_cast<ResourceItem*>(ObjectAt(aIndex));
}
uint32_t
ResourceQueue::GetAtOffset(uint64_t aOffset, uint32_t *aResourceOffset)
{
MOZ_RELEASE_ASSERT(aOffset >= mOffset);
uint64_t offset = mOffset;
for (uint32_t i = 0; i < uint32_t(GetSize()); ++i) {
ResourceItem* item = ResourceAt(i);
// If the item contains the start of the offset we want to
// break out of the loop.
if (item->mData->Length() + offset > aOffset) {
if (aResourceOffset) {
*aResourceOffset = aOffset - offset;
}
return i;
}
offset += item->mData->Length();
}
return GetSize();
}
ResourceItem*
ResourceQueue::PopFront()
{
return static_cast<ResourceItem*>(nsDeque::PopFront());
}
#undef SBR_DEBUG
#undef SBR_DEBUGV
} // namespace mozilla
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