Added aac bitstream converter

media/filters/ffmpeg_aac_bitstream_converter.h

Index: media/filters/ffmpeg_aac_bitstream_converter.h
diff --git a/media/filters/ffmpeg_aac_bitstream_converter.h b/media/filters/ffmpeg_aac_bitstream_converter.h
new file mode 100644
index 0000000000000000000000000000000000000000..c71f6badb55361aa897c3ac5c32e2f04a8e1736c
--- /dev/null
+++ b/media/filters/ffmpeg_aac_bitstream_converter.h
@@ -0,0 +1,48 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MEDIA_FILTERS_FFMPEG_AAC_BITSTREAM_CONVERTER_H_
+#define MEDIA_FILTERS_FFMPEG_AAC_BITSTREAM_CONVERTER_H_
+
+#include "base/basictypes.h"
+#include "media/base/media_export.h"
+#include "media/filters/ffmpeg_bitstream_converter.h"
+
+// Forward declarations for FFmpeg datatypes used.
+struct AVCodecContext;
+struct AVPacket;
+
+namespace media {
+
+// Bitstream converter that adds ADTS headers to AAC frames.
+class MEDIA_EXPORT FFmpegAACBitstreamConverter
+    : public FFmpegBitstreamConverter {
+ public:
+  enum { kAdtsHeaderSize = 7 };
+
+  // The |stream_codec_context| will be used during conversion and should be the
+  // AVCodecContext for the stream sourcing these packets. A reference to
+  // |stream_codec_context| is retained, so it must outlive this class.
+  explicit FFmpegAACBitstreamConverter(AVCodecContext* stream_codec_context);
+  ~FFmpegAACBitstreamConverter() override;

[damienv1, 2014/11/08 03:08:48]

virtual ~FFmpegAACBitstreamConverter(); instead ?

+
+  // FFmpegBitstreamConverter implementation.
+  // Uses FFmpeg allocation methods for buffer allocation to ensure
+  // compatibility with FFmpeg's memory management.
+  bool ConvertPacket(AVPacket* packet) override;

[damienv1, 2014/11/08 03:08:48]

Shouldn't this be: virtual ... ?

+
+ private:
+  // Variable to hold a pointer to memory where we can access the global
+  // data from the FFmpeg file format's global headers.
+  AVCodecContext* stream_codec_context_;
+
+  bool header_generated_;
+  uint8_t hdr_[kAdtsHeaderSize];
+
+  DISALLOW_COPY_AND_ASSIGN(FFmpegAACBitstreamConverter);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_FILTERS_FFMPEG_AAC_BITSTREAM_CONVERTER_H_