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82 lines
3.4 KiB
Text
82 lines
3.4 KiB
Text
/*!
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\page CreatingAudioDriver Creating the audio driver
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The synthesizer itself does not write any audio to the audio output. This
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allows application developers to manage the audio output themselves if they
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wish. The next section describes the use of the synthesizer without an audio
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driver in more detail.
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Creating the audio driver is straightforward: set the
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<code>audio.driver</code> settings and create the driver object. Because the
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FluidSynth has support for several audio systems, you may want to change
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which one you want to use. The list below shows the audio systems that are
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currently supported. It displays the name, as used by the fluidsynth library,
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and a description.
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- jack: JACK Audio Connection Kit (Linux, Mac OS X, Windows)
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- alsa: Advanced Linux Sound Architecture (Linux)
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- oss: Open Sound System (Linux, Unix)
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- pulseaudio: PulseAudio (Linux, Mac OS X, Windows)
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- coreaudio: Apple CoreAudio (Mac OS X)
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- dsound: Microsoft DirectSound (Windows)
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- portaudio: PortAudio Library (Mac OS 9 & X, Windows, Linux)
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- sndman: Apple SoundManager (Mac OS Classic)
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- dart: DART sound driver (OS/2)
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- opensles: OpenSL ES (Android)
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- oboe: Oboe (Android)
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- waveout: Microsoft WaveOut, alternative to DirectSound (Windows CE x86,
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Windows Mobile 2003 for ARMv5, Windows 98 SE, Windows NT 4.0, Windows XP
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and later)
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- file: Driver to output audio to a file
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- sdl2*: Simple DirectMedia Layer (Linux, Windows, Mac OS X, iOS, Android,
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FreeBSD, Haiku, etc.)
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The default audio driver depends on the settings with which FluidSynth was
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compiled. You can get the default driver with
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fluid_settings_getstr_default(). To get the list of available drivers use the
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fluid_settings_foreach_option() function. Finally, you can set the driver
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with fluid_settings_setstr(). In most cases, the default driver should work
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out of the box.
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Additional options that define the audio quality and latency are
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\setting{audio_sample-format}, \setting{audio_period-size}, and \setting{audio_periods}. The details
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are described later.
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You create the audio driver with the new_fluid_audio_driver() function. This
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function takes the settings and synthesizer object as arguments. For example:
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\code
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void init()
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{
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fluid_settings_t* settings;
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fluid_synth_t* synth;
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fluid_audio_driver_t* adriver;
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settings = new_fluid_settings();
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/* Set the synthesizer settings, if necessary */
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synth = new_fluid_synth(settings);
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fluid_settings_setstr(settings, "audio.driver", "jack");
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adriver = new_fluid_audio_driver(settings, synth);
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}
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\endcode
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As soon as the audio driver is created, it will start playing. The audio
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driver creates a separate thread that uses the synthesizer object to generate
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the audio.
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There are a number of general audio driver settings. The audio.driver
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settings define the audio subsystem that will be used. The \setting{audio_periods} and
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\setting{audio_period-size} settings define the latency and robustness against
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scheduling delays. There are additional settings for the audio subsystems
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used. For a full list of available <strong>audio driver settings</strong>,
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please refer to the \setting{audio} documentation.
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<strong>*Note:</strong> In order to use sdl2 as audio driver, the application
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is responsible for initializing SDL (e.g. with SDL_Init()). This must be done
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<strong>before</strong> the first call to <code>new_fluid_settings()</code>!
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Also make sure to call SDL_Quit() after all fluidsynth instances have been
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destroyed.
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*/
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