Pure Data compiler, translates pd files into C code for compilation on embedded systems. Presently targeting ARM Cortex-M4F microcontrollers.
This project is in a very early stage of development. It can only comprehend and compile patches comprised of a very limited set of objects -- all of them audio-rate objects.
Using an example "A01.sinewave.pd" that (I think) comes with Pure Data, here is the generated C code.
#include <stdio.h>
#include <math.h>
static const float SAMPLING_RATE = 44100.0f;
static float object_0_phase = 0.0f;
static FILE* object_1_file = NULL;
void init() {
object_0_phase = 0.0f;
object_1_file = fopen("dac_1.f32", "wb");
}
void dsptick() {
const float object_0_outlet_0 = cosf(object_0_phase);
const float object_0_phase_increment = 440.000000f * 2.0f * M_PI / SAMPLING_RATE;
object_0_phase = fmodf(object_0_phase + object_0_phase_increment, 2.0f * M_PI);
const float object_3_outlet_0 = object_0_outlet_0 * 0.050000f;
const float object_1_buffer[2] = { object_3_outlet_0, 0.0f };
fwrite(object_1_buffer, sizeof(object_1_buffer), 1, object_1_file);
}
void deinit() {
fclose(object_1_file);
object_1_file = NULL;
}To run pd_compile.py, you will need:
- Peak-Rules, which is used for conditionally binding visitor functions to classes of Pure Data objects. These visitor functions generate C code that is run at different times over the PD patch lifespan.
Run pd_compile.py with a single argument, the name of a Pure Data patch file. A bunch of parsing and debugging junk will be printed, along with the generated C code. The generated C code is also placed in a file called "out.c".
There is also a Makefile which will generate C code for a Pure Data patch file, and compile it with a wrapper main() function into an executable "main" that generates three seconds worth of audio into a zero or more dac_.f32 files (containing 32-bit float sample data). The number of dac_.f32 files is determined by the number of DAC objects in the patch file.
This is totally half-baked test code, if you couldn't tell...
Copyright (C) 2011 Jared Boone, ShareBrained Technology, Inc.
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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ShareBrained Technology, Inc.