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/* -*- 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 "ResourceQueue.h"
#include "MediaData.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/IntegerPrintfMacros.h"
#include "mozilla/Logging.h"
#include "mozilla/Sprintf.h"
#include "mozilla/Unused.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(const MediaSpan& aData, uint64_t aOffset)
: mData(aData), mOffset(aOffset) {}
size_t ResourceItem::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const {
return aMallocSizeOf(this);
}
class ResourceQueueDeallocator : public nsDequeFunctor<ResourceItem> {
void operator()(ResourceItem* aObject) override { delete aObject; }
};
ResourceQueue::ResourceQueue()
: nsDeque<ResourceItem>(new ResourceQueueDeallocator()),
mLogicalLength(0),
mOffset(0) {}
uint64_t ResourceQueue::GetOffset() { return mOffset; }
uint64_t ResourceQueue::GetLength() { return mLogicalLength; }
const uint8_t* ResourceQueue::GetContiguousAccess(int64_t aOffset,
size_t aSize) {
uint32_t offset = 0;
uint32_t start = GetAtOffset(aOffset, &offset);
if (start >= GetSize()) {
return nullptr;
}
ResourceItem* item = ResourceAt(start);
if (offset + aSize > item->mData.Length()) {
return nullptr;
}
return item->mData.Elements() + offset;
}
void ResourceQueue::CopyData(uint64_t aOffset, uint32_t aCount, char* aDest) {
uint32_t offset = 0;
uint32_t start = GetAtOffset(aOffset, &offset);
size_t i = start;
while (i < uint32_t(GetSize()) && aCount > 0) {
ResourceItem* item = ResourceAt(i++);
uint32_t bytes = std::min(aCount, uint32_t(item->mData.Length() - offset));
if (bytes != 0) {
memcpy(aDest, item->mData.Elements() + offset, bytes);
offset = 0;
aCount -= bytes;
aDest += bytes;
}
}
}
void ResourceQueue::AppendItem(const MediaSpan& aData) {
uint64_t offset = mLogicalLength;
mLogicalLength += aData.Length();
Push(new ResourceItem(aData, offset));
}
uint32_t ResourceQueue::Evict(uint64_t aOffset, uint32_t aSizeToEvict) {
SBR_DEBUG("Evict(aOffset=%" PRIu64 ", aSizeToEvict=%u)", aOffset,
aSizeToEvict);
return EvictBefore(std::min(aOffset, mOffset + (uint64_t)aSizeToEvict));
}
uint32_t ResourceQueue::EvictBefore(uint64_t aOffset) {
SBR_DEBUG("EvictBefore(%" PRIu64 ")", aOffset);
uint32_t evicted = 0;
while (GetSize()) {
ResourceItem* item = ResourceAt(0);
SBR_DEBUG("item=%p length=%zu offset=%" PRIu64, item, item->mData.Length(),
mOffset);
if (item->mData.Length() + mOffset >= aOffset) {
if (aOffset <= mOffset) {
break;
}
uint32_t offset = aOffset - mOffset;
mOffset += offset;
evicted += offset;
item->mData.RemoveFront(offset);
item->mOffset += offset;
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 (GetSize()) {
ResourceItem* item = ResourceAt(0);
SBR_DEBUG("item=%p length=%zu offset=%" PRIu64, 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<ResourceItem>::SizeOfExcludingThis(aMallocSizeOf);
// Sum the ResourceItems. The ResourceItems's MediaSpans may share the
// same underlying MediaByteBuffers, so we need to de-dupe the buffers
// in order to report an accurate size.
nsTArray<MediaByteBuffer*> buffers;
for (uint32_t i = 0; i < uint32_t(GetSize()); ++i) {
const ResourceItem* item = ResourceAt(i);
size += item->SizeOfIncludingThis(aMallocSizeOf);
if (!buffers.Contains(item->mData.Buffer())) {
buffers.AppendElement(item->mData.Buffer());
}
}
for (MediaByteBuffer* buffer : buffers) {
size += buffer->ShallowSizeOfExcludingThis(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;
}
Unused << 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) const {
MOZ_RELEASE_ASSERT(aOffset >= mOffset);
size_t hi = GetSize();
size_t lo = 0;
while (lo < hi) {
size_t mid = lo + (hi - lo) / 2;
const ResourceItem* resource = ResourceAt(mid);
if (resource->mOffset <= aOffset &&
aOffset < resource->mOffset + resource->mData.Length()) {
if (aResourceOffset) {
*aResourceOffset = aOffset - resource->mOffset;
}
return uint32_t(mid);
}
if (resource->mOffset + resource->mData.Length() <= aOffset) {
lo = mid + 1;
} else {
hi = mid;
}
}
return uint32_t(GetSize());
}
ResourceItem* ResourceQueue::PopFront() {
return nsDeque<ResourceItem>::PopFront();
}
#undef SBR_DEBUG
#undef SBR_DEBUGV
} // namespace mozilla
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