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Add documentation about missing E-AC-3 features.

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Originally committed as revision 18021 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2009-03-17 01:43:01 +00:00
parent 9e85f9c526
commit 137707e53a
1 changed files with 28 additions and 0 deletions
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28
libavcodec/eac3dec.c
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@ -20,6 +20,34 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* There are several features of E-AC-3 that this decoder does not yet support.
*
* Spectral Extension
* There is a patch to get this working for the two samples we have that
* use it, but it needs some minor changes in order to be accepted.
*
* Enhanced Coupling
* No known samples exist. If any ever surface, this feature should not be
* too difficult to implement.
*
* Reduced Sample Rates
* No known samples exist. The spec also does not give clear information
* on how this is to be implemented.
*
* Dependent Streams
* Only the independent stream is currently decoded. Any dependent
* streams are skipped. We have only come across two examples of this, and
* they are both just test streams, one for HD-DVD and the other for
* Blu-ray.
*
* Transient Pre-noise Processing
* This is side information which a decoder should use to reduce artifacts
* caused by transients. There are samples which are known to have this
* information, but this decoder currently ignores it.
*/
#include "avcodec.h"
#include "internal.h"
#include "aac_ac3_parser.h"