We made further tests regarding input >= 32000 Hz under Linux.
The audiodistortion depends on the used resampling: parameter:
if PJMEDIA_RESAMPLE_IMP set to:
PJMEDIA_RESAMPLE_LIBRESAMPLE (default) -> signal distorted
PJMEDIA_RESAMPLE_LIBSAMPLERATE -> signal distorted
PJMEDIA_RESAMPLE_SPEEX -> signal OK
libsamplerate (a.k.a Secret Rabbit Code) had to be activated first
(\pjproject\third_party\build\samplerate\README.txt)
...and the speex resample as well:
- change in PJMEDIA makefile in line 57 (add last module)
resample_resample.o resample_libsamplerate.o resample_speex.o\
- in file resample_speex.c change type casting as follows (compiler errors):
speex_resampler_process_interleaved_int(resample->state,
(const spx_int16_t *)input,(spx_uint32_t *)&in_length,
(spx_int16_t *)output,(spx_uint32_t *) &out_length);
- und surely don't forget to enable in config_site.h:
#define PJMEDIA_RESAMPLE_IMP PJMEDIA_RESAMPLE_SPEEX
As speex resample is rather experimental, we do not know what that means
and if the param "quality" which we set to 9 is relevant here. But there is
definitely something wrong the way pjsip embeds the libresample routines.
regards,
Thomas Kluge
