![]() ![]() If you use Clip for playing, then the Clip implementation creates this type of thread itself. If you use SourceDataLine for playing, then a separate thread for writing data into the line is also the preferred method to use. The preferred way to record is to read data in a separate thread to prevent the possible influence of other tasks (for example, UI handling). If all data from the buffer has been played and no new data is written to the line, then an underrun condition will occur, and silence will be played until you write a new portion of audio data to the line. This will produce artifacts in the recorded audio data.Ī similar situation occurs with playing. If you did not read from the line for a long time, then an overrun condition will occur, and older data will be replaced with new data. Recorded data is kept in a DataLine buffer. See AudioSystem.getAudioInputStream documentation for details about format conversion. If you need to play or record mu-law data, then the preferred way is to convert it to PCM format through a format converter. Most sound cards support only PCM formats, and even if the driver supports mu-law, then it requires some modification to the software. The formats are supported by most sound cards. On the Taskbar near the clock lower right click the little up arrow and make sure the volume icon is not hidden. Use supported formats as much as possible: PCM 8 or 16 bits 8000, 11025, 22050, 44100 Hz. Start - Settings - System - Notifications & Actions - Select which icons appear on the taskbar make sure Volume is on - if already on Click OFF then back On. To use some audio format for recording or playing, the format must be supported by your system (sound card drivers). Java Sound supports various audio formats, but their availability depends on the operating system. In any case, you must handle the presence of the plug-in, for example, by distributing the required plug-ins with your application or by requiring plug-ins to be installed in the client Java environment. For more information, see ALSADisabling auto mute on startup. Auto-Mute Mode is a configurable setting from amixer. You can use Sun, third-party, or your own plug-ins to read various audio files. Here you will find some hints on volume issues and why you may not hear anything. Java Sound also supports plug-ins for file readers and writers through the service provider interface (SPI). Java Sound file readers support some formats (uncompressed PCM, a-law, mu-law), but do not support ADPCM, MP3, and others. Most of the file formats are only containers and can contain audio data in various compressed audio formats. Java Sound supports a set of audio file formats, for example AU, AIF, and WAV. On the Linux operating system, you might be unable to play sounds because an application (or sound daemon, such as esd or artsd) opens the audio device exclusively, thereby denying Java Sound access to the device. Java audio sound music player tutorial explainedjava audio sound musicimport java.io.File import java.io.IOException import import java. To test your sound configuration, run any native sound application and play some sound through it. In addition, ensure that your speakers are connected and that your sound card volume and mute state are adjusted to the appropriate value. Protected void destroyApp (boolean unconditional) else if (event.Troubleshoot Java sound issues such as system sound configuration, audio file format, audio format, and overrun and underrun conditions.Įnsure that your audio system is correctly configured (sound card driver/DirectSound for Windows, ALSA for Linux). StopGauge = new Gauge ("Stop time", true, 20, 20) Ĭonfig = new ChoiceGroup ("", Choice.MULTIPLE) Ĭonfig.append ("Play local file?", null) VolumeGauge = new Gauge ("Vol", true, 10, 5) PlayerOptions = new Form ("Midi player") Play = new Command ("Play", Command.OK, 1) īack = new Command ("Back", Command.BACK, 1) LocalPrefix = getAppProperty ("LocalPrefix") Įxit = new Command ("Done", Command.EXIT, 1) RemotePrefix = getAppProperty ("RemotePrefix") ![]() MediaMidi = getAppProperty ("MediaMidi") The startApp() method builds and displays the UI for the playback options screen. The constructor retrieves the paths to the local and remote MIDI files from the JAD attributes. The MidiPlayer class source code is shown below. It manages two Form objects: the playerOptions is for the option screen, and the playerStates is for the MIDI channel volume screen. The MidiPlayer class extends the MIDlet class and implements the CommandAction interface. So, do not try it on Nokia 3650 or 6600 devices. The current Series 60 devices do not support the various MIDI playback controls used in the MidiPlayer example (Table 9-4). ![]()
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