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-rw-r--r--dom/media/BufferMediaResource.h141
1 files changed, 141 insertions, 0 deletions
diff --git a/dom/media/BufferMediaResource.h b/dom/media/BufferMediaResource.h
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+++ b/dom/media/BufferMediaResource.h
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+/* 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 "nsIPrincipal.h"
+#include <algorithm>
+
+namespace mozilla {
+
+// 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:
+ BufferMediaResource(const uint8_t* aBuffer,
+ uint32_t aLength,
+ nsIPrincipal* aPrincipal,
+ const nsACString& aContentType) :
+ mBuffer(aBuffer),
+ mLength(aLength),
+ mOffset(0),
+ mPrincipal(aPrincipal),
+ mContentType(aContentType)
+ {
+ MOZ_COUNT_CTOR(BufferMediaResource);
+ }
+
+protected:
+ virtual ~BufferMediaResource()
+ {
+ MOZ_COUNT_DTOR(BufferMediaResource);
+ }
+
+private:
+ nsresult Close() override { return NS_OK; }
+ void Suspend(bool aCloseImmediately) override {}
+ void Resume() override {}
+ // Get the current principal for the channel
+ already_AddRefed<nsIPrincipal> GetCurrentPrincipal() override
+ {
+ nsCOMPtr<nsIPrincipal> principal = mPrincipal;
+ return principal.forget();
+ }
+ bool CanClone() override { return false; }
+ already_AddRefed<MediaResource> CloneData(MediaResourceCallback*) override
+ {
+ return nullptr;
+ }
+
+ // These methods are called off the main thread.
+ // The mode is initially MODE_PLAYBACK.
+ void SetReadMode(MediaCacheStream::ReadMode aMode) override {}
+ void SetPlaybackRate(uint32_t aBytesPerSecond) override {}
+ 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);
+ mOffset = aOffset + *aBytes;
+ return NS_OK;
+ }
+ int64_t Tell() override { return mOffset; }
+
+ void Pin() override {}
+ void Unpin() override {}
+ double GetDownloadRate(bool* aIsReliable) override { *aIsReliable = false; return 0.; }
+ int64_t GetLength() override { return mLength; }
+ int64_t GetNextCachedData(int64_t aOffset) override { return aOffset; }
+ int64_t GetCachedDataEnd(int64_t aOffset) override { return mLength; }
+ bool IsDataCachedToEndOfResource(int64_t aOffset) override { return true; }
+ bool IsSuspendedByCache() override { return false; }
+ bool IsSuspended() override { return false; }
+ 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 Open(nsIStreamListener** aStreamListener) override
+ {
+ return NS_ERROR_FAILURE;
+ }
+
+ nsresult GetCachedRanges(MediaByteRangeSet& aRanges) override
+ {
+ aRanges += MediaByteRange(0, int64_t(mLength));
+ return NS_OK;
+ }
+
+ bool IsTransportSeekable() override { return true; }
+
+ const nsCString& GetContentType() const override
+ {
+ return mContentType;
+ }
+
+ size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const override
+ {
+ // Not owned:
+ // - mBuffer
+ // - mPrincipal
+ size_t size = MediaResource::SizeOfExcludingThis(aMallocSizeOf);
+ size += mContentType.SizeOfExcludingThisIfUnshared(aMallocSizeOf);
+
+ return size;
+ }
+
+ size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override
+ {
+ return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
+ }
+
+private:
+ const uint8_t * mBuffer;
+ uint32_t mLength;
+ uint32_t mOffset;
+ nsCOMPtr<nsIPrincipal> mPrincipal;
+ const nsCString mContentType;
+};
+
+} // namespace mozilla
+
+#endif