Re: how to play 16k audio file
Dmitriy Korovkin <[email protected]>
| Newsgroups | gmane.comp.handhelds.opie.devel |
|---|---|
| Message-ID | <[email protected]> |
Dear Ywlee, Thanks, I'll take a try. Dmitriy [email protected] wrote: >Dear Korovkin, > >Please find attached hello_16k_mono.pcm and >simplay.c for C example. > >#compile >gcc simplay.c -o simplay > >#test >simplay hello_16k_mono.pcm > >This example is not working under opie 0.82. >If I modify line 32, and 33 to be > nSampleRate = 16000; > nChannels = 1; >-> > nSampleRate = 48000; > nChannels = 2; > >It can play sampling rate 48000 stereo pcm file. >I am wondering if I had to install extra drivers >to make 16000 mono sound file able to play. > >Have a nice day >Thanks and Best regards, > >Alan > >--- Dmitriy Korovkin <[email protected]> 說： > > > >>Alan, will you attach a sound file and describe how >>we can reproduce the >>problem you see, please. >> >>Dmitriy >> >> >> >>[email protected] wrote: >> >> >> >>>Hi all, >>> >>>Under opie 0.82, >>>I found I can only configure /dev/audio >>>to be 48000 sampling rate with stereo playback. >>> >>>Do I need more driver or patch to make >>>16000 mono audio to play? >>> >>>Best regards, >>> >>>Alan >>> >>>___________________________________________________ >>> >>> >>>最新版 Yahoo!奇摩即時通訊 >>> >>> >>7.0，免費網路電話任你打！ >> >> >>>http://messenger.yahoo.com.tw/ >>>_______________________________________________ >>> >>> >>> >>http://opie.handhelds.org/cgi-bin/moin.cgi/DeveloperWikiIndex >> >> >>>Opie-devel mailing list >>>[email protected] >>>https://handhelds.org/mailman/listinfo/opie-devel >>> >>> >>> >>> >>> >> >> > > >___________________________________________________ > 最新版 Yahoo!奇摩即時通訊 7.0，免費網路電話任你打！ > http://messenger.yahoo.com.tw/ > >------------------------------------------------------------------------ > >#include <stdio.h> >#include <unistd.h> >#include <stdlib.h> >#include <sys/ioctl.h> >#include <stdlib.h> >#include <fcntl.h> >#include <signal.h> >#include <sys/soundcard.h> >#include <string.h> >#include <wait.h> > >#define BUFFER_SIZE 320000 //10 seconds for 16k,16bit > >int main(int argc, char **argv) >{ > int nDevice, nFormat, nSampleRate, nChannels, nLen, nClose; > char szBuffer[BUFFER_SIZE]; > FILE *fp; > > if (argc<2) { > printf("usage: %s play_file\n", argv[0]); > return -1; > } > > //playback > //open device > nDevice = open("/dev/dsp", O_WRONLY, 0); > printf("device open: %d\n",nDevice); > > //io setting > nFormat = AFMT_S16_LE; > nSampleRate = 16000; > nChannels = 1; > printf("set record format : %d\n",ioctl(nDevice, SNDCTL_DSP_SETFMT, &nFormat)); > printf("set sample rate : %d\n",ioctl(nDevice, SNDCTL_DSP_SPEED, &nSampleRate)); > printf("set channels : %d\n",ioctl(nDevice, SNDCTL_DSP_STEREO, &nChannels)); > > //read data > fp = fopen(argv[1], "rb"); > printf("playback ...\n"); > while ( ( nLen=fread(szBuffer, sizeof(char), sizeof(szBuffer), fp) )>0 ) { > printf("play data : %d\n",write(nDevice, szBuffer, nLen)); > } > fclose(fp); > > //close device > nClose = 0; > printf("set close : %d\n",ioctl(nDevice, SNDCTL_DSP_SYNC, &nClose)); > printf("device close: %d\n",close(nDevice)); > > return 0; >} > > _______________________________________________ http://opie.handhelds.org/cgi-bin/moin.cgi/DeveloperWikiIndex Opie-devel mailing list [email protected] https://handhelds.org/mailman/listinfo/opie-devel