shithub: opus

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ref: 5c80391b3529bcb3fc8afd3b83d7562bae4991ae
parent: df6620eb0b691e68faf10a7311baabe2d11531c4
author: Jean-Marc Valin <[email protected]>
date: Thu Dec 16 09:11:48 EST 2010 

Comments, low bit-rate busting avoidance


--- a/libcelt/bands.c
+++ b/libcelt/bands.c
@@ -830,7 +830,7 @@
          {
             if (spread==2 && B<=1)
             {
-               /* Folded spectrum */
+               /* Noise */
                for (j=0;j<N;j++)
                {
                   *seed = lcg_rand(*seed);
@@ -837,7 +837,7 @@
                   X[j] = (int)(*seed)>>20;
                }
             } else {
-               /* Noise */
+               /* Folded spectrum */
                for (j=0;j<N;j++)
                   X[j] = lowband[j];
             }
--- a/libcelt/celt.c
+++ b/libcelt/celt.c
@@ -822,7 +822,7 @@
       } while (++c<C);
 
 #ifdef ENABLE_POSTFILTER
-      if (LM != 0 && nbAvailableBytes>10)
+      if (LM != 0 && nbAvailableBytes>10*C)
       {
          VARDECL(celt_word16, pitch_buf);
          ALLOC(pitch_buf, (COMBFILTER_MAXPERIOD+N)>>1, celt_word16);
@@ -946,7 +946,7 @@
 
    tf_encode(st->start, st->end, isTransient, tf_res, LM, tf_select, enc);
 
-   if (shortBlocks || st->complexity < 3)
+   if (shortBlocks || st->complexity < 3 || nbAvailableBytes < 10*C)
    {
       if (st->complexity == 0)
       {
--- a/libcelt/rate.c
+++ b/libcelt/rate.c
@@ -141,7 +141,7 @@
 #define ALLOC_STEPS 6
 
 static inline int interp_bits2pulses(const CELTMode *m, int start, int end,
-      int *bits1, int *bits2, const int *thresh, int total, int *bits,
+      const int *bits1, const int *bits2, const int *thresh, int total, int *bits,
       int *ebits, int *fine_priority, int len, int _C, int LM, void *ec, int encode, int prev)
 {
    int psum;
@@ -357,7 +357,7 @@
    return codedBands;
 }
 
-int compute_allocation(const CELTMode *m, int start, int end, int *offsets, int alloc_trim,
+int compute_allocation(const CELTMode *m, int start, int end, const int *offsets, int alloc_trim,
       int total, int *pulses, int *ebits, int *fine_priority, int _C, int LM, void *ec, int encode, int prev)
 {
    int lo, hi, len, j;
--- a/libcelt/rate.h
+++ b/libcelt/rate.h
@@ -102,7 +102,7 @@
  @param pulses Number of pulses per band (returned)
  @return Total number of bits allocated
 */
-int compute_allocation(const CELTMode *m, int start, int end, int *offsets, int alloc_trim,
+int compute_allocation(const CELTMode *m, int start, int end, const int *offsets, int alloc_trim,
       int total, int *pulses, int *ebits, int *fine_priority, int _C, int LM, void *ec, int encode, int prev);