1 files changed, 81 insertions, 0 deletions
diff --git a/dom/media/webm/EbmlComposer.h b/dom/media/webm/EbmlComposer.h
new file mode 100644
index 0000000000..a037e4ef8b
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+++ b/dom/media/webm/EbmlComposer.h
@@ -0,0 +1,81 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
+/* 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/. */
+
+#ifndef EbmlComposer_h_
+#define EbmlComposer_h_
+#include "nsTArray.h"
+#include "ContainerWriter.h"
+
+namespace mozilla {
+
+/*
+ * A WebM muxer helper for package the valid WebM format.
+ */
+class EbmlComposer {
+ public:
+  EbmlComposer() = default;
+  /*
+   * Assign the parameters which header requires. These can be called multiple
+   * times to change paramter values until GenerateHeader() is called, when this
+   * becomes illegal to call again.
+   */
+  void SetVideoConfig(uint32_t aWidth, uint32_t aHeight, uint32_t aDisplayWidth,
+                      uint32_t aDisplayHeight);
+  void SetAudioConfig(uint32_t aSampleFreq, uint32_t aChannels);
+  /*
+   * Set the CodecPrivateData for writing in header.
+   */
+  void SetAudioCodecPrivateData(nsTArray<uint8_t>& aBufs) {
+    mCodecPrivateData.AppendElements(aBufs);
+  }
+  /*
+   * Generate the whole WebM header with the configured tracks, and make
+   * available to ExtractBuffer. Must only be called once.
+   */
+  void GenerateHeader();
+  /*
+   * Insert media encoded buffer into muxer and it would be package
+   * into SimpleBlock. If no cluster is opened, new cluster will start for
+   * writing. Frames passed to this function should already have any codec delay
+   * applied.
+   */
+  nsresult WriteSimpleBlock(EncodedFrame* aFrame);
+  /*
+   * Get valid cluster data.
+   */
+  void ExtractBuffer(nsTArray<nsTArray<uint8_t>>* aDestBufs,
+                     uint32_t aFlag = 0);
+
+ private:
+  // True once we have written the first cluster header. We cannot serialize any
+  // P-frames until this is true, since we start a new cluster every I-frame.
+  bool mHasWrittenCluster = false;
+  // The timecode of the cluster.
+  uint64_t mCurrentClusterTimecode = 0;
+
+  // Written data to be flushed out by ExtractBuffer().
+  nsTArray<nsTArray<uint8_t>> mBuffer;
+
+  // True when Metadata has been serialized into mBuffer.
+  bool mMetadataFinished = false;
+
+  // Video configuration
+  int mWidth = 0;
+  int mHeight = 0;
+  int mDisplayWidth = 0;
+  int mDisplayHeight = 0;
+  bool mHasVideo = false;
+
+  // Audio configuration
+  float mSampleFreq = 0;
+  int mChannels = 0;
+  bool mHasAudio = false;
+  // Audio codec specific header data.
+  nsTArray<uint8_t> mCodecPrivateData;
+};
+
+}  // namespace mozilla
+
+#endif