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139 lines
3.4 KiB
C
139 lines
3.4 KiB
C
/* FluidSynth FX - An example of using effects with fluidsynth
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*
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* This code is in the public domain.
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*
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* To compile:
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* gcc -g -O -o fluidsynth_fx fluidsynth_fx.c -lfluidsynth
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*
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* To run
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* fluidsynth_fx soundfont gain
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*
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* [Peter Hanappe]
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <fluidsynth.h>
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/* The structure with the effects data. This example simply applies a
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* linear gain the to synthesizer output. */
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struct fx_data_t {
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fluid_synth_t* synth;
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float gain;
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} fx_data_t;
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/* This function implements the callback function of the audio driver
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* (see new_fluid_audio_driver2 below). The data argument is a pointer
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* to your private data structure. 'len' is the number of samples in
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* the buffers. 'nin' and 'nout' are the number of input and output
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* audio buffers. 'in' and 'out' are an array of float buffers with
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* the samples. The audio driver fills the 'in' buffers the incoming
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* audio. The 'out' buffers should be filled by your function. The
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* 'out' buffers will be sent to the audio output of the sound card.
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*
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* IMPORTANT NOTE: The API was designed to be generic but none of the
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* audio drivers currently handles audio input. Either 'nin' will be
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* zero, or the buffers will be filled with zero samples.
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*/
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int fx_function(void* data, int len,
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int nin, float** in,
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int nout, float** out)
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{
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struct fx_data_t* fx_data = (struct fx_data_t*) data;
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int i, k;
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float* out_i;
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/* Call the synthesizer to fill the output buffers with its
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* audio output. */
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if (fluid_synth_process(fx_data->synth, len, nin, in, nout, out) != 0) {
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/* Some error occured. Very unlikely to happen, though. */
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return -1;
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}
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/* Apply your effects here. In this example, the gain is
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* applied to all the output buffers. */
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for (i = 0; i < nout; i++) {
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out_i = out[i];
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for (k = 0; k < len; k++) {
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out_i[k] *= fx_data->gain;
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}
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}
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return 0;
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}
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int main(int argc, char** argv)
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{
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fluid_settings_t* settings;
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fluid_synth_t* synth = NULL;
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fluid_audio_driver_t* adriver = NULL;
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int err = 0;
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struct fx_data_t fx_data;
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if (argc != 3) {
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fprintf(stderr, "Usage: fluidsynth_simple [soundfont] [gain]\n");
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return 1;
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}
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/* Create the settings object. This example uses the default
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* values for the settings. */
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settings = new_fluid_settings();
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if (settings == NULL) {
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fprintf(stderr, "Failed to create the settings\n");
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err = 2;
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goto cleanup;
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}
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/* Create the synthesizer */
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synth = new_fluid_synth(settings);
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if (synth == NULL) {
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fprintf(stderr, "Failed to create the synthesizer\n");
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err = 3;
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goto cleanup;
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}
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/* Load the soundfont */
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if (fluid_synth_sfload(synth, argv[1], 1) == -1) {
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fprintf(stderr, "Failed to load the SoundFont\n");
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err = 4;
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goto cleanup;
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}
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/* Fill in the data of the effects unit */
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fx_data.synth = synth;
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fx_data.gain = atof(argv[2]);
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/* Create the audio driver. As soon as the audio driver is
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* created, the synthesizer can be played. */
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adriver = new_fluid_audio_driver2(settings, fx_function, (void*) &fx_data);
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if (adriver == NULL) {
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fprintf(stderr, "Failed to create the audio driver\n");
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err = 5;
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goto cleanup;
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}
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/* Play a note */
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fluid_synth_noteon(synth, 0, 60, 100);
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printf("Press \"Enter\" to stop: ");
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fgetc(stdin);
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printf("done\n");
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cleanup:
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if (adriver) {
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delete_fluid_audio_driver(adriver);
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}
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if (synth) {
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delete_fluid_synth(synth);
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}
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if (settings) {
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delete_fluid_settings(settings);
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}
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return err;
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}
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