mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-09 19:35:51 +00:00
e5e885ae31
# ignore-this-changeset --HG-- extra : amend_source : 7221c8d15a765df71171099468e7c7faa648f37c extra : histedit_source : a0cce6015636202bff09e35a13f72e03257a7695
77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
/* vim:set ts=2 sw=2 sts=2 et cindent: */
|
|
/* 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/. */
|
|
|
|
#if !defined(BufferMediaResource_h_)
|
|
# define BufferMediaResource_h_
|
|
|
|
# include "MediaResource.h"
|
|
# include "nsISeekableStream.h"
|
|
# include <algorithm>
|
|
|
|
namespace mozilla {
|
|
|
|
DDLoggedTypeDeclNameAndBase(BufferMediaResource, MediaResource);
|
|
|
|
// A simple MediaResource based on an in memory buffer. This class accepts
|
|
// the address and the length of the buffer, and simulates a read/seek API
|
|
// on top of it. The Read implementation involves copying memory, which is
|
|
// unfortunate, but the MediaResource interface mandates that.
|
|
class BufferMediaResource
|
|
: public MediaResource,
|
|
public DecoderDoctorLifeLogger<BufferMediaResource> {
|
|
public:
|
|
BufferMediaResource(const uint8_t* aBuffer, uint32_t aLength)
|
|
: mBuffer(aBuffer), mLength(aLength) {}
|
|
|
|
protected:
|
|
virtual ~BufferMediaResource() {}
|
|
|
|
private:
|
|
// These methods are called off the main thread.
|
|
nsresult ReadAt(int64_t aOffset, char* aBuffer, uint32_t aCount,
|
|
uint32_t* aBytes) override {
|
|
if (aOffset < 0 || aOffset > mLength) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
*aBytes = std::min(mLength - static_cast<uint32_t>(aOffset), aCount);
|
|
memcpy(aBuffer, mBuffer + aOffset, *aBytes);
|
|
return NS_OK;
|
|
}
|
|
// Memory-based and no locks, caching discouraged.
|
|
bool ShouldCacheReads() override { return false; }
|
|
|
|
void Pin() override {}
|
|
void Unpin() override {}
|
|
int64_t GetLength() override { return mLength; }
|
|
int64_t GetNextCachedData(int64_t aOffset) override { return aOffset; }
|
|
int64_t GetCachedDataEnd(int64_t aOffset) override {
|
|
return std::max(aOffset, int64_t(mLength));
|
|
}
|
|
bool IsDataCachedToEndOfResource(int64_t aOffset) override { return true; }
|
|
nsresult ReadFromCache(char* aBuffer, int64_t aOffset,
|
|
uint32_t aCount) override {
|
|
if (aOffset < 0) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
uint32_t bytes = std::min(mLength - static_cast<uint32_t>(aOffset), aCount);
|
|
memcpy(aBuffer, mBuffer + aOffset, bytes);
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult GetCachedRanges(MediaByteRangeSet& aRanges) override {
|
|
aRanges += MediaByteRange(0, int64_t(mLength));
|
|
return NS_OK;
|
|
}
|
|
|
|
private:
|
|
const uint8_t* mBuffer;
|
|
uint32_t mLength;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif
|