Bug 842243 - Part 1: Add ContainerWriter.h; Base class of media container writer. r=roc

content/media/encoder/ContainerWriter.h

@@ -0,0 +1,56 @@
+/* -*- 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 ContainerWriter_h_
+#define ContainerWriter_h_
+
+#include "nsTArray.h"
+#include "nsAutoPtr.h"
+
+namespace mozilla {
+/**
+ * ContainerWriter packs encoded track data into a specific media container.
+ */
+class ContainerWriter {
+public:
+  ContainerWriter()
+    : mInitialized(false)
+  {}
+  virtual ~ContainerWriter() {}
+
+  enum {
+    END_OF_STREAM = 1 << 0
+  };
+
+  /**
+   * Writes encoded track data from aBuffer to a packet, and insert this packet
+   * into the internal stream of container writer. aDuration is the playback
+   * duration of this packet in number of samples. aFlags is true with
+   * END_OF_STREAM if this is the last packet of track.
+   * Currently, WriteEncodedTrack doesn't support multiple tracks.
+   */
+  virtual nsresult WriteEncodedTrack(const nsTArray<uint8_t>& aBuffer,
+                                     int aDuration, uint32_t aFlags = 0) = 0;
+
+  enum {
+    FLUSH_NEEDED = 1 << 0
+  };
+
+  /**
+   * Copies the final container data to a buffer if it has accumulated enough
+   * packets from WriteEncodedTrack. This buffer of data is appended to
+   * aOutputBufs, and existing elements of aOutputBufs should not be modified.
+   * aFlags is true with FLUSH_NEEDED will force OggWriter to flush an ogg page
+   * even it is not full, and copy these container data to a buffer for
+   * aOutputBufs to append.
+   */
+  virtual nsresult GetContainerData(nsTArray<nsTArray<uint8_t> >* aOutputBufs,
+                                    uint32_t aFlags = 0) = 0;
+
+protected:
+  bool mInitialized;
+};
+}
+#endif

content/media/encoder/moz.build

@@ -0,0 +1,11 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+MODULE = 'content'
+
+EXPORTS += [
+    'ContainerWriter.h',
+]

content/media/moz.build

@@ -4,6 +4,8 @@
 # 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/.
 
+PARALLEL_DIRS += ['encoder']
+
 PARALLEL_DIRS += ['webaudio']
 
 if CONFIG['MOZ_RAW']: