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<h1>fluidsynth_fx.c</h1> </div>
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<p>Example of using effects with fluidsynth</p>
<div class="fragment"><pre class="fragment"><span class="comment">/* FluidSynth FX - An example of using effects with fluidsynth</span>
<span class="comment"> *</span>
<span class="comment"> * This code is in the public domain.</span>
<span class="comment"> *</span>
<span class="comment"> * To compile:</span>
<span class="comment"> * gcc -g -O -o fluidsynth_fx fluidsynth_fx.c -lfluidsynth</span>
<span class="comment"> *</span>
<span class="comment"> * To run</span>
<span class="comment"> * fluidsynth_fx soundfont gain</span>
<span class="comment"> *</span>
<span class="comment"> * [Peter Hanappe]</span>
<span class="comment"> */</span>
<span class="preprocessor">#include <stdio.h></span>
<span class="preprocessor">#include <stdlib.h></span>
<span class="preprocessor">#include <<a class="code" href="fluidsynth_8h.html" title="FluidSynth is a real-time synthesizer designed for SoundFont(R) files.">fluidsynth.h</a>></span>
<span class="comment">/* The structure with the effects data. This example simply applies a</span>
<span class="comment"> * linear gain the to synthesizer output. */</span>
<span class="keyword">struct </span>fx_data_t {
<a class="code" href="types_8h.html#ae265f10ae174a13afe010de50d87e1a4" title="Synthesizer instance.">fluid_synth_t</a>* synth;
<span class="keywordtype">float</span> gain;
} fx_data_t;
<span class="comment">/* This function implements the callback function of the audio driver</span>
<span class="comment"> * (see new_fluid_audio_driver2 below). The data argument is a pointer</span>
<span class="comment"> * to your private data structure. 'len' is the number of samples in</span>
<span class="comment"> * the buffers. 'nin' and 'nout' are the number of input and output</span>
<span class="comment"> * audio buffers. 'in' and 'out' are an array of float buffers with</span>
<span class="comment"> * the samples. The audio driver fills the 'in' buffers the incoming</span>
<span class="comment"> * audio. The 'out' buffers should be filled by your function. The</span>
<span class="comment"> * 'out' buffers will be sent to the audio output of the sound card.</span>
<span class="comment"> *</span>
<span class="comment"> * IMPORTANT NOTE: The API was designed to be generic but none of the</span>
<span class="comment"> * audio drivers currently handles audio input. Either 'nin' will be</span>
<span class="comment"> * zero, or the buffers will be filled with zero samples.</span>
<span class="comment"> */</span>
<span class="keywordtype">int</span> fx_function(<span class="keywordtype">void</span>* data, <span class="keywordtype">int</span> len,
<span class="keywordtype">int</span> nin, <span class="keywordtype">float</span>** in,
<span class="keywordtype">int</span> nout, <span class="keywordtype">float</span>** out)
{
<span class="keyword">struct </span>fx_data_t* fx_data = (<span class="keyword">struct </span>fx_data_t*) data;
<span class="keywordtype">int</span> i, k;
<span class="keywordtype">float</span>* out_i;
<span class="comment">/* Call the synthesizer to fill the output buffers with its</span>
<span class="comment"> * audio output. */</span>
<span class="keywordflow">if</span> (<a name="a0"></a><a class="code" href="synth_8h.html#a1ac90e2732aa652679305f78cbd66670" title="Synthesize floating point audio to audio buffers.">fluid_synth_process</a>(fx_data->synth, len, nin, in, nout, out) != 0) {
<span class="comment">/* Some error occured. Very unlikely to happen, though. */</span>
<span class="keywordflow">return</span> -1;
}
<span class="comment">/* Apply your effects here. In this example, the gain is</span>
<span class="comment"> * applied to all the output buffers. */</span>
<span class="keywordflow">for</span> (i = 0; i < nout; i++) {
out_i = out[i];
<span class="keywordflow">for</span> (k = 0; k < len; k++) {
out_i[k] *= fx_data->gain;
}
}
<span class="keywordflow">return</span> 0;
}
<span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span>** argv)
{
<a class="code" href="types_8h.html#aa363402d3c77333b0f070ba531d034ba" title="Configuration settings instance.">fluid_settings_t</a>* settings;
<a class="code" href="types_8h.html#ae265f10ae174a13afe010de50d87e1a4" title="Synthesizer instance.">fluid_synth_t</a>* synth = NULL;
<a class="code" href="types_8h.html#ac3706330ce49cac5b7dd079e90d376d8" title="Audio driver instance.">fluid_audio_driver_t</a>* adriver = NULL;
<span class="keywordtype">int</span> err = 0;
<span class="keyword">struct </span>fx_data_t fx_data;
<span class="keywordflow">if</span> (argc != 3) {
fprintf(stderr, <span class="stringliteral">"Usage: fluidsynth_simple [soundfont] [gain]\n"</span>);
<span class="keywordflow">return</span> 1;
}
<span class="comment">/* Create the settings object. This example uses the default</span>
<span class="comment"> * values for the settings. */</span>
settings = <a name="a1"></a><a class="code" href="settings_8h.html#ad7ab9269a28c2b5852d512ffe3546949" title="Create a new settings object.">new_fluid_settings</a>();
<span class="keywordflow">if</span> (settings == NULL) {
fprintf(stderr, <span class="stringliteral">"Failed to create the settings\n"</span>);
err = 2;
<span class="keywordflow">goto</span> cleanup;
}
<span class="comment">/* Create the synthesizer */</span>
synth = <a name="a2"></a><a class="code" href="synth_8h.html#a344f7369c0f57d30f72702d0c88e6178" title="Create new FluidSynth instance.">new_fluid_synth</a>(settings);
<span class="keywordflow">if</span> (synth == NULL) {
fprintf(stderr, <span class="stringliteral">"Failed to create the synthesizer\n"</span>);
err = 3;
<span class="keywordflow">goto</span> cleanup;
}
<span class="comment">/* Load the soundfont */</span>
<span class="keywordflow">if</span> (<a name="a3"></a><a class="code" href="synth_8h.html#aaf9376cf7189f9c64da5ffdeed85c9c4" title="Load a SoundFont file (filename is interpreted by SoundFont loaders).">fluid_synth_sfload</a>(synth, argv[1], 1) == -1) {
fprintf(stderr, <span class="stringliteral">"Failed to load the SoundFont\n"</span>);
err = 4;
<span class="keywordflow">goto</span> cleanup;
}
<span class="comment">/* Fill in the data of the effects unit */</span>
fx_data.synth = synth;
fx_data.gain = atof(argv[2]);
<span class="comment">/* Create the audio driver. As soon as the audio driver is</span>
<span class="comment"> * created, the synthesizer can be played. */</span>
adriver = <a name="a4"></a><a class="code" href="audio_8h.html#a3959d8add1dea97e507a5ea2c802c0bc" title="Create a new audio driver.">new_fluid_audio_driver2</a>(settings, fx_function, (<span class="keywordtype">void</span>*) &fx_data);
<span class="keywordflow">if</span> (adriver == NULL) {
fprintf(stderr, <span class="stringliteral">"Failed to create the audio driver\n"</span>);
err = 5;
<span class="keywordflow">goto</span> cleanup;
}
<span class="comment">/* Play a note */</span>
<a name="a5"></a><a class="code" href="synth_8h.html#a4a98222fe1c36bfd598dc4cd89f4b75c" title="Send a note-on event to a FluidSynth object.">fluid_synth_noteon</a>(synth, 0, 60, 100);
printf(<span class="stringliteral">"Press \"Enter\" to stop: "</span>);
fgetc(stdin);
printf(<span class="stringliteral">"done\n"</span>);
cleanup:
<span class="keywordflow">if</span> (adriver) {
<a name="a6"></a><a class="code" href="audio_8h.html#a05678e633d37da0f93000045393e9442" title="Deletes an audio driver instance.">delete_fluid_audio_driver</a>(adriver);
}
<span class="keywordflow">if</span> (synth) {
<a name="a7"></a><a class="code" href="synth_8h.html#a585a63f3a25b9df17b82ae87f2d38cfc" title="Delete a FluidSynth instance.">delete_fluid_synth</a>(synth);
}
<span class="keywordflow">if</span> (settings) {
<a name="a8"></a><a class="code" href="settings_8h.html#a550270f09e4f3c645cbe9e6d3c514ca4" title="Delete the provided settings object.">delete_fluid_settings</a>(settings);
}
<span class="keywordflow">return</span> err;
}
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