[FFmpeg-devel] [PATCH 1/3] [GSoC] [AAC] aacenc: Add support for Perceptual Noise Substitution energy values

Michael Niedermayer michaelni at gmx.at
Mon Apr 13 01:33:13 CEST 2015

On Sun, Apr 12, 2015 at 05:50:34AM +0100, Rostislav Pehlivanov wrote:
> This commit implements support for writing the noise energy values used in PNS. The difference between regular scalefactors and noise energy values is that the latter require a small preamble (NOISE_PRE + energy_value_diff) to be written as the first noise-containing band. Any following noise energy values use the previous one to base their "diff" on. Ordinary scalefactors remain unchanged other than that they ignore the noise values.
> This commit should not change anything by itself, the following commits will bring it in use.
> ---
>  libavcodec/aac.h    |  3 +++
>  libavcodec/aacenc.c | 17 ++++++++++++++---
>  2 files changed, 17 insertions(+), 3 deletions(-)

have you checked that the values which are stored are equal to
what the decoder reads out again ?

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Awnsering whenever a program halts or runs forever is
On a turing machine, in general impossible (turings halting problem).
On any real computer, always possible as a real computer has a finite number
of states N, and will either halt in less than N cycles or never halt.
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