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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /dom/media/BufferMediaResource.h
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/media/BufferMediaResource.h')
-rw-r--r--dom/media/BufferMediaResource.h76
1 files changed, 76 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 <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() = default;
+
+ 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