Matlab GUI which implements Zafar's audio player (Zap), featuring some practical functionalities such as a playback line, a select/drag tool, and a synchronized spectrogram.
Files:
zap.m: Matlab GUI which implements Zap.audio_file.wav: audio file used for the examples.
Zap implements a simple audio player as a Matlab programmatic GUI. The user can open a WAV or MP3 file, play/stop the audio, select/drag a region to play, and zoom and pan on the axes. The code is self-explanatory, heavily commented, and fully modular. Parts of the code can be helpful for other GUIs, especially the playtool function which displays a playback line as the playback is in progress and the selecttool function which allows the user to create a selection line or region on the audio to play.
Functionalities:
- Select a WAVE or MP3 to open; the audio can be mono or stereo.
- Display the audio signal and the audio spectrogram; the x-axis limits of the signal axes and the spectrogram axes will be synchronized (and will stay synchronized if a zoom or pan is applied on one of them).
- Play the audio if the playback is not in progress; stop the audio if the playback is in progress; a playback line will be displayed as the playback is in progress.
- If there is no selection line or region, the audio will be played from the start to the end; if there is a selection line, the audio will be played from the selection line to the end of the audio; if there is a selection region, the audio will be played from the start to the end of the selection region.
- Pressing the space key will also play and stop the audio.
- If a left mouse click is done on the signal axes, a selection line is created; the audio will be played from the selection line to the end of the audio.
- If a left mouse click and drag is done on the signal axes or on a selection line, a selection region is created; the audio will be played from the start to the end of the selection region.
- If a left mouse click and drag is done on the left or right boundary of a selection region, the selection region is resized.
- If a right mouse click is done on the signal axes, any selection line or region is removed.
- Turn zooming on or off or magnify by factor (see https://mathworks.com/help/matlab/ref/zoom.html)
- If used on the signal axes, zoom horizontally only; the x-axis limits of the signal axes and the spectrogram axes will stay synchronized.
- Pan view of graph interactively (see https://www.mathworks.com/help/matlab/ref/pan.html)
- If used on the signal axes, pan horizontally only; the x-axis limits of the signal axes and the spectrogram axes will stay synchronized.
23 second audio excerpt from the song Que Pena Tanto Faz performed by Tamy.
- Zafar Rafii
- http://zafarrafii.com/
- CV
- GitHub
- Google Scholar