1 files changed, 89 insertions, 0 deletions
diff --git a/dom/media/webm/EbmlComposer.h b/dom/media/webm/EbmlComposer.h
new file mode 100644
index 000000000..389d33528
--- /dev/null
+++ b/dom/media/webm/EbmlComposer.h
@@ -0,0 +1,89 @@
+/* -*- 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();
+  /*
+   * Assign the parameter which header required.
+   */
+  void SetVideoConfig(uint32_t aWidth, uint32_t aHeight, uint32_t aDisplayWidth,
+                      uint32_t aDisplayHeight, float aFrameRate);
+
+  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 and output to mBuff.
+   */
+  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.
+   */
+  void WriteSimpleBlock(EncodedFrame* aFrame);
+  /*
+   * Get valid cluster data.
+   */
+  void ExtractBuffer(nsTArray<nsTArray<uint8_t> >* aDestBufs,
+                     uint32_t aFlag = 0);
+private:
+  // Move the metadata data to mClusterCanFlushBuffs.
+  void FinishMetadata();
+  // Close current cluster and move data to mClusterCanFlushBuffs.
+  void FinishCluster();
+  // The temporary storage for cluster data.
+  nsTArray<nsTArray<uint8_t> > mClusterBuffs;
+  // The storage which contain valid cluster data.
+  nsTArray<nsTArray<uint8_t> > mClusterCanFlushBuffs;
+
+  // Indicate the data types in mClusterBuffs.
+  enum {
+    FLUSH_NONE = 0,
+    FLUSH_METADATA = 1 << 0,
+    FLUSH_CLUSTER = 1 << 1
+  };
+  uint32_t mFlushState;
+  // Indicate the cluster header index in mClusterBuffs.
+  uint32_t mClusterHeaderIndex;
+  // The cluster length position.
+  uint64_t mClusterLengthLoc;
+  // Audio codec specific header data.
+  nsTArray<uint8_t> mCodecPrivateData;
+  // Codec delay in nanoseconds.
+  uint64_t mCodecDelay;
+
+  // The timecode of the cluster.
+  uint64_t mClusterTimecode;
+
+  // Video configuration
+  int mWidth;
+  int mHeight;
+  int mDisplayWidth;
+  int mDisplayHeight;
+  float mFrameRate;
+  // Audio configuration
+  float mSampleFreq;
+  int mChannels;
+};
+
+} // namespace mozilla
+
+#endif