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| john_cephalopoda | Hey, I am tinkering around with lv2 and sine waves, however I can't find out, how I can get the sampling rate, so I can make sine waves with the right frequency. | 11:05 |
|---|---|---|
| john_cephalopoda | Is there some parameter in LV2_Handle? I couldn't find much helpful information in the docs. | 11:06 |
| ventosus | john_cephalopoda: sample_rate is passed to LV2 instantiate function | 11:09 |
| ventosus | http://lv2plug.in/doc/html/group__lv2core.html#a8dbb1fd9ebae0477a11dfc4f0a685d72 | 11:09 |
| john_cephalopoda | So I have to read it out and store it into some global variable? | 11:10 |
| ventosus | store it, yes | 11:12 |
| ventosus | do not use global variables in plugins, though | 11:12 |
| john_cephalopoda | Where else shoud I store it O_o | 11:16 |
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| ventosus | in the struct(C) or class(C++) you return to the host as LV2_Handle | 11:18 |
| edogawa | can't you also query jack via jack_get_sample_rate () dynamically? or is that too expensive | 11:20 |
| edogawa | or don't you use jack at all... | 11:20 |
| john_cephalopoda | I use jack. | 11:21 |
| john_cephalopoda | But when it is given to it anyway... | 11:22 |
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| ventosus | edogawa: you must not use any jack* func inside a LV2 plugin, the plugin may well run on top of something else, ALSA, CoreAudio, file, ... | 11:24 |
| edogawa | ventosus: ah sorry, i'm not a coder as you see :) | 11:24 |
| ventosus | edogawa: np | 11:25 |
| john_cephalopoda | So I now got a variable that stores the number of the current sample. It has to be aviable over several iterations of run() and must be increased every time the next sample is selected. | 11:27 |
| john_cephalopoda | But apparently the currentsample variable is write-protected. | 11:27 |
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| john_cephalopoda | I don't get why it is write-protected. It is basically exactly the same like output[]. | 11:41 |
| john_cephalopoda | double const currentsample = *(synth->currentsample); | 11:43 |
| john_cephalopoda | float* const output = synth->output; | 11:43 |
| ventosus | john_cephalopoda: maybe you use the <const> at the wrong place, can't tell from here | 11:49 |
| ventosus | http://stackoverflow.com/questions/1143262/what-is-the-difference-between-const-int-const-int-const-and-int-const | 11:49 |
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| john_cephalopoda | The output for a sine should be (freq*2*Pi)/samplingrate | 12:24 |
| john_cephalopoda | * (freq*2*Pi*current_sample_number)/samplingrate | 12:24 |
| john_cephalopoda | But as soon as I add the sampling rate, it does weird stuff. | 12:25 |
| john_cephalopoda | Okay... | 12:30 |
| john_cephalopoda | It seems that the sampling rate is crap. | 12:30 |
| john_cephalopoda | When I enter "48000" directly, there are no problems | 12:30 |
| rgareus | john_cephalopoda: did you see http://lv2plug.in/book/#_metronome ? | 12:45 |
| john_cephalopoda | Haven't read it yet. | 12:51 |
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