opusenc: implement a psychoacoustic system

This commit implements a psychoacoustic system for the native Opus
encoder. Its unlike any other psychoacoustic system known since its
capable of using a lookahead to make better choices on how to treat the
current frame and how many bits to allocate for it (and future frames).

Also, whilst the main bulk of the analysis function has to run in a
single thread, the per-frame anaylsis functions does not modify the main
psychoacoustic context, so in the future it will be fairly trivial to
run those as slice threads.

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

1 files changed, 6 insertions, 0 deletions

diff --git a/libavcodec/opus_celt.h b/libavcodec/opus_celt.h
index 31299912bd..45d50ab27b 100644
--- a/libavcodec/opus_celt.h
+++ b/libavcodec/opus_celt.h
@@ -120,6 +120,12 @@ struct CeltFrame {
     uint32_t seed;
     enum CeltSpread spread;
 
+    /* Encoder PF coeffs */
+    int pf_octave;
+    int pf_period;
+    int pf_tapset;
+    float pf_gain;
+
     /* Bit allocation */
     int framebits;
     int remaining;