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