alsa

Set ALSA master volume from C code

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The following works for me. The parameter volume is to be given in the range [0, 100]. Beware, there is no error handling! void SetAlsaMasterVolume(long volume) { long min, max; snd_mixer_t *handle; snd_mixer_selem_id_t *sid; const char *card = “default”; const char *selem_name = “Master”; snd_mixer_open(&handle, 0); snd_mixer_attach(handle, card); snd_mixer_selem_register(handle, NULL, NULL); snd_mixer_load(handle); snd_mixer_selem_id_alloca(&sid); snd_mixer_selem_id_set_index(sid, 0); … Read more

Call recording – make it work on Nexus 5X (rooting or custom ROM possible)

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Not sure if it is a Nexus 5 specific issue but usually the class used to record calls is MediaRecorder. Have you tried to replace AudioRecorder by a MediaRecorder? Based on this stack-overflow question, I think you could try the following code based on Ben blog post: import android.media.MediaRecorder; import android.os.Environment; import java.io.File; import java.io.IOException; … Read more

How to play sound in a Docker container on Mac OS Yosemite

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It is definitely possible, you need to mount /dev/snd, see how Jess Frazelle launches a Spotify container, from https://blog.jessfraz.com/post/docker-containers-on-the-desktop/ you will notice docker run -it \ -v /tmp/.X11-unix:/tmp/.X11-unix \ # mount the X11 socket -e DISPLAY=unix$DISPLAY \ # pass the display –device /dev/snd \ # sound –name spotify \ jess/spotify or for Chrome, at the … Read more

Android > 4.0 : Ideas how to record/capture internal audio (e.g. STREAM_MUSIC)?

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You must pass audio traffic through your local socket server: Create local socket server Modify audio http stream address to path is thru your local socket server, for example for address http://example.com/stream.mp3 -> http://127.0.0.1:8888/http://example.com/stream.mp3 where 8888 is your socket port. Play http://127.0.0.1:8888/http://example.com/stream.mp3 with default media player Read all incoming requests to port 8888 in your … Read more

PyAudio working, but spits out error messages each time

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You can try to clean up your ALSA configuration, for example, ALSA lib pcm.c:2212:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear ALSA lib pcm.c:2212:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe ALSA lib pcm.c:2212:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side are caused by /usr/share/alsa/alsa.conf: pcm.rear cards.pcm.rear pcm.center_lfe cards.pcm.center_lfe pcm.side cards.pcm.side Once you comment out these lines, those error message will be gone. You may also want … Read more

Capturing sound from Wine with TargetDataLine

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Make use of AudioSystem.write() method. It is much easier targetDataLine.open(format); targetDataLine.start(); AudioInputStream ais=new AudioInputStream(targetDataLine); AudioFileFormat.Type fileformat=AudioFileFormat.Type.WAVE; /* Other Audio file formats supported: AudioFileFormat.Type.AU AudioFileFormat.Type.AIFF AudioFileFormat.Type.AIFC AudioFileFormat.Type.SND */ File audoutputfile=new File(‘myfile’); //adjust extension according to AudioFileFormat AudioSystem.write(ais,fileformat, audoutputfile);

Modifying in-call voice playback in Android custom ROM

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There are several possible issues that come to my mind. The blank buffer might indicate that you have the wrong source selected. Also since according to https://developer.android.com/reference/android/media/AudioRecord.html#AudioRecord(int,%20int,%20int,%20int,%20int) you might not always get an exception even if something’s wrong with the configuration, you might want to confirm whether your object has been initialized properly. If all … Read more