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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 

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@2294 74dad513-b988-da41-8d7b-12977e46ad98
This commit is contained in:
Benny Prijono 2008-09-18 14:11:29 +00:00
parent 4494a48287
commit 6ba5f59841
2 changed files with 17 additions and 3 deletions
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8
pjmedia/include/pjmedia/config.h
View File

@ -577,7 +577,9 @@
/**
* Specify the tone generator algorithm to be used.
* Specify the tone generator algorithm to be used. Please see
* http://trac.pjsip.org/repos/wiki/Tone_Generator for the performance
* analysis results of the various tone generator algorithms.
*
* Default value:
* - PJMEDIA_TONEGEN_FLOATING_POINT when PJ_HAS_FLOATING_POINT is set
@ -600,10 +602,10 @@
*
* Valid values are 1 to 28.
*
* Default value: 7
* Default value: 10
*/
#ifndef PJMEDIA_TONEGEN_FIXED_POINT_CORDIC_LOOP
# define PJMEDIA_TONEGEN_FIXED_POINT_CORDIC_LOOP 7
# define PJMEDIA_TONEGEN_FIXED_POINT_CORDIC_LOOP 10
#endif

12
pjmedia/src/pjmedia/tonegen.c
View File

@ -40,6 +40,8 @@
* This is the good old tone generator using sin().
* 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
{
@ -65,6 +67,8 @@
* the normal sin() generator.
* 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
{
@ -84,6 +88,12 @@
* Speed = 742 usec to generate 1 second, 8KHz dual-tones (2.66GHz P4).
* (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
#define CORDIC_HALF_PI 0x06487ED5
@ -184,6 +194,8 @@
* Quality wise not so good, but it's blazing fast!
* 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)
{