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/* 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 "mp4_demuxer/BufferStream.h"
#include "MediaData.h"
#include "MediaResource.h"
#include <algorithm>
using namespace mozilla;
namespace mp4_demuxer {
BufferStream::BufferStream()
: mStartOffset(0)
, mData(new mozilla::MediaByteBuffer)
{
}
BufferStream::BufferStream(mozilla::MediaByteBuffer* aBuffer)
: mStartOffset(0)
, mData(aBuffer)
{
}
BufferStream::~BufferStream()
{
}
/*virtual*/ bool
BufferStream::ReadAt(int64_t aOffset, void* aData, size_t aLength,
size_t* aBytesRead)
{
if (aOffset < mStartOffset || aOffset > mStartOffset + mData->Length()) {
return false;
}
*aBytesRead =
std::min(aLength, size_t(mStartOffset + mData->Length() - aOffset));
memcpy(aData, mData->Elements() + aOffset - mStartOffset, *aBytesRead);
return true;
}
/*virtual*/ bool
BufferStream::CachedReadAt(int64_t aOffset, void* aData, size_t aLength,
size_t* aBytesRead)
{
return ReadAt(aOffset, aData, aLength, aBytesRead);
}
/*virtual*/ bool
BufferStream::Length(int64_t* aLength)
{
*aLength = mStartOffset + mData->Length();
return true;
}
/* virtual */ void
BufferStream::DiscardBefore(int64_t aOffset)
{
if (aOffset > mStartOffset) {
mData->RemoveElementsAt(0, aOffset - mStartOffset);
mStartOffset = aOffset;
}
}
bool
BufferStream::AppendBytes(const uint8_t* aData, size_t aLength)
{
return mData->AppendElements(aData, aLength, fallible);
}
MediaByteRange
BufferStream::GetByteRange()
{
return MediaByteRange(mStartOffset, mStartOffset + mData->Length());
}
}
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