Introducing DecoderBuffer and general Buffer cleanup.

FFmpeg expects data to be padded and aligned in a certain way. It's
currently possible to do this incorrectly and introduce dangerous issues.

I enforce padding and alignment by introducing a new Buffer called
DecoderBuffer and forcing DemuxerStream::Read to only accept it for
transfer into decoders.

DecoderBuffer allocates all memory through av_malloc (which takes care of
alignment) with the appropriate padding size (except for Android, which
doesn't care about this).

Along the way it was necessary to clean up a large smattering of code to
replace usage of DataBuffer with DecoderBuffer.

I've rolled in several cleanup actions as well:
- Moved DecryptConfig from Buffer to DecoderBuffer.
- Replaced AVPacketBuffer and av_dup_packet with a DecoderBuffer::CopyFrom.
- Fixed a resultant issue with FFmpegBitStreamConverter after removing the
  av_dup_packet functionality.  Removed some unsupported bitstream filters.
- Reduce TestDataUtil::ReadTestDataFile() to a single method returning a
  DecoderBuffer so unit tests will always have safe buffers.
- Replace new DataBuffer(0)/new DecoderBuffer(0) w/
  DecoderBuffer::CreateEOSBuffer.
- Remove extraneous IsEndOfStream check from FFmpegAudioDecoder.

BUG=129843
TEST=media_unittests + valgrind, layout tests.

Review URL: https://chromiumcodereview.appspot.com/10447035

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@139857 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 0 insertions, 1 deletions

diff --git a/media/base/video_decoder.h b/media/base/video_decoder.h
index 61b626e..31589d1 100644
--- a/media/base/video_decoder.h
+++ b/media/base/video_decoder.h
@@ -13,7 +13,6 @@
 
 namespace media {
 
-class Buffer;
 class DemuxerStream;
 class VideoFrame;