i.MX ProcessorsのトピックRecording an audio file using ALSA arecord https://community.nxp.com/t5/i-MX-Processors/Recording-an-audio-file-using-ALSA-arecord/m-p/147928#M524 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>I'm trying to test the audio part of i.MX28 evk board.</P><P>I've build and installed ALSA-lib and ALSA-utils. After booting up the board I'm trying to record some audio from mic to a file and then play it to speakers.</P><P>For recording I'm using alsa "arecord" :<BR />arecord -D "hw:0,0" -t wav -c 2 -r 48000 -f S16_LE foo1.wav</P><P>For playing I'm using alsa "aplay":<BR />aplay foo1.wav</P><P>The file is created by arecord but when i try to play it I dont hear a thing.</P><P>arecord -l show me:<BR />**** List of CAPTURE Hardware Devices ****<BR />card 0: mxsevk [mxs-evk], device 0: SGTL5000 SGTL5000-0 []<BR /> Subdevices: 1/1<BR /> Subdevice #0: subdevice #0</P><P>aplay -l<BR />**** List of PLAYBACK Hardware Devices ****<BR />card 0: mxsevk [mxs-evk], device 0: SGTL5000 SGTL5000-0 []<BR /> Subdevices: 1/1<BR /> Subdevice #0: subdevice #0<BR />card 1: mxsevk_1 [mxs-evk], device 0: MXS SPDIF mxs spdif-0 []<BR /> Subdevices: 1/1<BR /> Subdevice #0: subdevice #0</P><P>Also amixer:</P><P>root@freescale ~$ amixer<BR />.............................<BR />Simple mixer control 'Capture',0<BR /> Capabilities: cvolume<BR /> Capture channels: Front Left - Front Right<BR /> Limits: Capture 0 - 15<BR /> Front Left: Capture 15 [100%]<BR /> Front Right: Capture 15 [100%]<BR />Simple mixer control 'Capture Vol Reduction',0<BR /> Capabilities: enum<BR /> Items: 'No Change' 'Reduced by 6dB'<BR /> Item0: 'No Change'<BR />Simple mixer control 'ADC Mux',0<BR /> Capabilities: enum<BR /> Items: 'MIC_IN' 'LINE_IN'<BR /> Item0: 'MIC_IN'<BR />Simple mixer control 'DAC Mux',0<BR /> Capabilities: enum<BR /> Items: 'DAC' 'LINE_IN'<BR /> Item0: 'DAC'<BR />.......<BR />I've tried to change 'ADC mux' to LINE_IN but still no luck.</P><P>When I'm playing an external .wav all works ok and I can hear it with high quality.</P><P>Can anyone help me?</P><P>Thanks,<BR />Gabriel Oprea</P></BODY></HTML> Thu, 22 Mar 2012 16:44:33 GMT GabrielO 2012-03-22T16:44:33Z Recording an audio file using ALSA arecord https://community.nxp.com/t5/i-MX-Processors/Recording-an-audio-file-using-ALSA-arecord/m-p/147928#M524 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>I'm trying to test the audio part of i.MX28 evk board.</P><P>I've build and installed ALSA-lib and ALSA-utils. After booting up the board I'm trying to record some audio from mic to a file and then play it to speakers.</P><P>For recording I'm using alsa "arecord" :<BR />arecord -D "hw:0,0" -t wav -c 2 -r 48000 -f S16_LE foo1.wav</P><P>For playing I'm using alsa "aplay":<BR />aplay foo1.wav</P><P>The file is created by arecord but when i try to play it I dont hear a thing.</P><P>arecord -l show me:<BR />**** List of CAPTURE Hardware Devices ****<BR />card 0: mxsevk [mxs-evk], device 0: SGTL5000 SGTL5000-0 []<BR /> Subdevices: 1/1<BR /> Subdevice #0: subdevice #0</P><P>aplay -l<BR />**** List of PLAYBACK Hardware Devices ****<BR />card 0: mxsevk [mxs-evk], device 0: SGTL5000 SGTL5000-0 []<BR /> Subdevices: 1/1<BR /> Subdevice #0: subdevice #0<BR />card 1: mxsevk_1 [mxs-evk], device 0: MXS SPDIF mxs spdif-0 []<BR /> Subdevices: 1/1<BR /> Subdevice #0: subdevice #0</P><P>Also amixer:</P><P>root@freescale ~$ amixer<BR />.............................<BR />Simple mixer control 'Capture',0<BR /> Capabilities: cvolume<BR /> Capture channels: Front Left - Front Right<BR /> Limits: Capture 0 - 15<BR /> Front Left: Capture 15 [100%]<BR /> Front Right: Capture 15 [100%]<BR />Simple mixer control 'Capture Vol Reduction',0<BR /> Capabilities: enum<BR /> Items: 'No Change' 'Reduced by 6dB'<BR /> Item0: 'No Change'<BR />Simple mixer control 'ADC Mux',0<BR /> Capabilities: enum<BR /> Items: 'MIC_IN' 'LINE_IN'<BR /> Item0: 'MIC_IN'<BR />Simple mixer control 'DAC Mux',0<BR /> Capabilities: enum<BR /> Items: 'DAC' 'LINE_IN'<BR /> Item0: 'DAC'<BR />.......<BR />I've tried to change 'ADC mux' to LINE_IN but still no luck.</P><P>When I'm playing an external .wav all works ok and I can hear it with high quality.</P><P>Can anyone help me?</P><P>Thanks,<BR />Gabriel Oprea</P></BODY></HTML> Thu, 22 Mar 2012 16:44:33 GMT https://community.nxp.com/t5/i-MX-Processors/Recording-an-audio-file-using-ALSA-arecord/m-p/147928#M524 GabrielO 2012-03-22T16:44:33Z Re: Recording an audio file using ALSA arecord https://community.nxp.com/t5/i-MX-Processors/Recording-an-audio-file-using-ALSA-arecord/m-p/147929#M525 <HTML><HEAD></HEAD><BODY><P>Hello Gabriel,</P><P></P><P>On my i.MX28 EVK, I use this command to switch the MUX to LINE_IN and it works.</P><P></P><P><SPAN style="font-family: courier new,courier;">$ amixer cset numid=7 1<SPAN class="mce_paste_marker"></SPAN></SPAN></P><P></P><P>Regards,</P><P>Peter</P></BODY></HTML> Thu, 24 Jan 2013 10:03:50 GMT https://community.nxp.com/t5/i-MX-Processors/Recording-an-audio-file-using-ALSA-arecord/m-p/147929#M525 PeterChan 2013-01-24T10:03:50Z