Changeset 2294 for pjproject/trunk/pjmedia/src/pjmedia/tonegen.c

Timestamp:

Sep 18, 2008 2:11:29 PM (16 years ago)

Author:

bennylp

Message:

More ticket #619: changed default Cordic loop from 8 to 10 to gain more accuracy, and updated tonegen.c with the results from ARM9 tests

File:

• pjproject/trunk/pjmedia/src/pjmedia/tonegen.c (modified) (4 diffs)

pjproject/trunk/pjmedia/src/pjmedia/tonegen.c

@@ -41 +41 @@
      * Speed = 1347 usec to generate 1 second, 8KHz dual-tones (2.66GHz P4).
      *         approx. 10.91 MIPS
+     *
+     *         506,535 usec/100.29 MIPS on ARM926EJ-S.
      */
     struct gen
@@ -66 +68 @@
      * Speed = 350 usec to generate 1 second, 8KHz dual-tones (2.66GHz P4).
      *         approx. 2.84 MIPS
+     *
+     *         18,037 usec/3.57 MIPS on ARM926EJ-S.
      */
     struct gen
@@ -85 +89 @@
      *         (PJMEDIA_TONEGEN_FIXED_POINT_CORDIC_LOOP=7)
      *         approx. 6.01 MIPS
+     *
+     *         ARM926EJ-S results:
+     *          loop=7:   8,943 usec/1.77 MIPS
+     *          loop=8:   9,872 usec/1.95 MIPS
+     *          loop=10: 11,662 usec/2.31 MIPS
+     *          loop=12: 13,561 usec/2.69 MIPS
      */
     #define CORDIC_1K           0x026DD3B6
@@ -185 +195 @@
      * Speed = 117 usec to generate 1 second, 8KHz dual-tones (2.66GHz P4).
      *         approx. 0.95 MIPS
+     *
+     *         1,449 usec/0.29 MIPS on ARM926EJ-S.
      */
     PJ_INLINE(int) approximate_sin3(unsigned x)