SILK fixes following last codec WG meeting

decoder:
- fixed incorrect scaling of filter states for the smallest quantization
  step sizes
- NLSF2A now limits the prediction gain of LPC filters

encoder:
- increased damping of LTP coefficients in LTP analysis
- increased white noise fraction in noise shaping LPC analysis
- introduced maximum total prediction gain.  Used by Burg's method to
  exit early if prediction gain is exceeded.  This improves packet
  loss robustness and numerical robustness in Burg's method
- Prefiltered signal is now in int32 Q10 domain, from int16 Q0
- Increased max number of iterations in CBR gain control loop from 5 to 6
- Removed useless code from LTP scaling control
- Optimization: smarter LPC loop unrolling
- Switched default win32 compile mode to be floating-point

resampler:
- made resampler have constant delay of 0.75 ms; removed delay
  compensation from silk code.
- removed obsolete table entries (~850 Bytes)
- increased downsampling filter order from 16 to 18/24/36 (depending on
  frequency ratio)
- reoptimized filter coefficients

1 files changed, 0 insertions, 4 deletions

diff --git a/silk/structs.h b/silk/structs.h
index 9f7fd298..338281b8 100644
--- a/silk/structs.h
+++ b/silk/structs.h
@@ -150,7 +150,6 @@ typedef struct {
     opus_int                     minInternal_fs_Hz;                 /* Minimum internal sampling frequency (Hz)                         */
     opus_int                     desiredInternal_fs_Hz;             /* Soft request for internal sampling frequency (Hz)                */
     opus_int                     fs_kHz;                            /* Internal sampling frequency (kHz)                                */
-    opus_int                     delay;                             /* Number of samples of delay to apply */
     opus_int                     nb_subfr;                          /* Number of 5 ms subframes in a frame                              */
     opus_int                     frame_length;                      /* Frame length (samples)                                           */
     opus_int                     subfr_length;                      /* Subframe length (samples)                                        */
@@ -194,7 +193,6 @@ typedef struct {
 
     /* Input/output buffering */
     opus_int16                   inputBuf[ MAX_FRAME_LENGTH + 2 ];  /* Buffer containing input signal                                   */
-    opus_int16                   delayBuf[MAX_ENCODER_DELAY];
     opus_int                     inputBufIx;
     opus_int                     nFramesPerPacket;
     opus_int                     nFramesEncoded;                    /* Number of frames analyzed in current packet                      */
@@ -261,8 +259,6 @@ typedef struct {
     opus_int32                  exc_Q10[ MAX_FRAME_LENGTH ];
     opus_int32                  sLPC_Q14_buf[ MAX_LPC_ORDER ];
     opus_int16                  outBuf[ MAX_FRAME_LENGTH + 2 * MAX_SUB_FRAME_LENGTH ];  /* Buffer for output signal                     */
-    opus_int16                  delayBuf[ MAX_DECODER_DELAY ];      /* Buffer for delaying the SILK output prior to resampling          */
-    opus_int                    delay;                              /* How much decoder delay to add                                    */
     opus_int                    lagPrev;                            /* Previous Lag                                                     */
     opus_int8                   LastGainIndex;                      /* Previous gain index                                              */
     opus_int                    fs_kHz;                             /* Sampling frequency in kHz                                        */