lavc: implement an ATRAC9 decoder

This commit implements a full ATRAC9 decoder, a simple low-delay codec
developed by Sony and used in most PSVita games, some PS3 games and some
PS4 games. Its similar to AAC in that it uses Huffman coded scalefactors
but instead of vector quantization it just Huffman codes the spectral
coefficients (in a way similar to how Opus splits band energy coding
into coarse and fine precision). It opts to write rather large Huffman
codes by packing several small coefficients into one Huffman coded
symbol, though I don't believe this increases efficiency at all.
Band extension implements SBC in a simple way, first it mirrors the
lower spectrum onto the higher frequencies and then it uses one of 5
filters to shape it. Noise substitution is implemented via 2 of them.
Unlike previous ATRAC codecs, there's no QMF, this is a standard MDCT
codec.

Based off of the reverse engineering work of Alex Barney.

Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 90d170b..505a361 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -392,6 +392,7 @@ extern AVCodec ff_atrac3_decoder;
 extern AVCodec ff_atrac3al_decoder;
 extern AVCodec ff_atrac3p_decoder;
 extern AVCodec ff_atrac3pal_decoder;
+extern AVCodec ff_atrac9_decoder;
 extern AVCodec ff_binkaudio_dct_decoder;
 extern AVCodec ff_binkaudio_rdft_decoder;
 extern AVCodec ff_bmv_audio_decoder;