2008/8/31 Joseph Garvin <[EMAIL PROTECTED]>: > On Sun, Aug 31, 2008 at 3:05 AM, Magnus Holmgren <[EMAIL PROTECTED]> wrote: >> >> Joseph Garvin wrote: >> >>> To shrink my plugin size I'm trying to convert my sound samples to be >>> 22050hz instead of 44100. But when I do this the sound always plays too fast >>> like a chipmunk. I'm calling pcm_set_frequency(22050) but no matter what >>> number I give it (I tested crazy values like 100) I get the same result. It >>> always tries to play at 44100hz. I'm trying on the Sansa e200 simulator. Is >>> this a limitation of the simulator or maybe of the e200? If so it'd be nice >>> to get some sort of console warning. >> >> pcm_set_frequency sets the frequency of the hardware, but it is usually >> quite limited in what frequencies it supports. Try dsp_configure, using >> DSP_SWITCH_FREQUENCY, to set the frequency. See the mpegplayer audio thread >> for an example. > > I tried: > > struct dsp_config* dsp = (struct dsp_config *)rb->dsp_configure(NULL, > DSP_MYDSP, > > CODEC_IDX_AUDIO); > rb->dsp_configure(dsp, DSP_SWITCH_FREQUENCY, 22050); > rb->pcm_set_frequency(22050); > rb->pcm_apply_settings(); > > But this still had no effect, at least in the simulator. Do I need to use > dsp_process somehow? It's unclear to me how it works. I'm still playing the > sound with pcm_play_data. >
The uisimulator is not using rockboxs dsp yet, I have here some basic code to use the dsp for bass, treble settings. The frequency stuff is on todo for the audioapi. Maybe I will find some time to commit some stuff during the coming week. -- BSc, Christian Gmeiner
