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From: | Иван Заярный |
Subject: | [fluid-dev] Streaming midi rendering data to playback output. |
Date: | Tue, 22 Oct 2013 14:03:03 +0400 |
Hi everyone)
I faced with next problem. Midi file rendering works slowly. It can take 20-30 seconds for one minute midi file long.
So i've decided to design streaming generated sound data from midi to a playback output.
Idea is simple :generated from midi file audio data goes to output, while synth is generating other data.
I've tried to do it by using fluid_player. But i faced with another problem: generated audio file sounds much faster than it should be.(than original midi file)
I tried to set bpm(tempo) manually, it didn't help me. It looks like fluid_player_set_bpm() method doesn't work at all.
Example of code used for generating audio data from midi file:
player = new_fluid_player(synth);
fluid_player_add(player, midiPath);
fluid_settings_setstr(settings, "audio.file.type", "raw");
fluid_settings_setnum(settings, "synth.sample-rate", 44100);
fluid_settings_setstr(settings, "audio.file.format", "s16");
fluid_settings_setstr(settings, "audio.file.endian", "little");
fluid_settings_setint(settings, "audio.period-size", 4096);
fluid_player_play(player);
fluid_player_set_bpm(player,65);// i get tempo from test midi file.
fluid_synth_write_s16(synth, buffersize / 2 , buffer2 ,0 , 2, buffer2, 1, 2);
Links to test data
Midi file:https://www.dropbox.com/s/agt158q7umvcuxv/testMelody.mid
Generated wave: https://www.dropbox.com/s/rt8p39zzsgbs8j7/generatedMelody.wav
Could you give me an example of how to generate audio data from midi file to memory in "streaming manner"?
What’s wrong with my code example ? Is it bug of fluid player or i am just incorrectly using fluidSynth lib?
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