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/******************************************************************************
* recordMyDesktop *
*******************************************************************************
* *
* Copyright (C) 2006,2007,2008 John Varouhakis *
* *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software *
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
* *
* *
* *
* For further information contact me at johnvarouhakis@gmail.com *
******************************************************************************/
#include "config.h"
#include "rmd_opendev.h"
#ifdef HAVE_LIBASOUND
#include <alsa/asoundlib.h>
#else
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#ifdef HAVE_LIBASOUND
snd_pcm_t *OpenDev( const char *pcm_dev,
unsigned int *channels,
unsigned int *frequency,
snd_pcm_uframes_t *buffsize,
snd_pcm_uframes_t *periodsize,
unsigned int *periodtime,
int *hard_pause){
snd_pcm_t *mhandle;
snd_pcm_hw_params_t *hwparams;
unsigned int periods=2;
unsigned int exactrate = *frequency;
// The compiler might warn us because the expansion starts with
// assert(&hwparams)
snd_pcm_hw_params_alloca(&hwparams);
if (snd_pcm_open(&mhandle,pcm_dev,SND_PCM_STREAM_CAPTURE,SND_PCM_ASYNC)<0){
fprintf(stderr, "Couldn't open PCM device %s\n", pcm_dev);
return NULL;
}
else
fprintf(stderr, "Opened PCM device %s\n", pcm_dev);
if (snd_pcm_hw_params_any(mhandle, hwparams)<0){
fprintf(stderr, "Couldn't configure PCM device.\n");
return NULL;
}
if (snd_pcm_hw_params_set_access(mhandle,
hwparams,
SND_PCM_ACCESS_RW_INTERLEAVED)<0){
fprintf(stderr, "Couldn't set access.\n");
return NULL;
}
if (snd_pcm_hw_params_set_format(mhandle,
hwparams,
SND_PCM_FORMAT_S16_LE)<0){
fprintf(stderr, "Couldn't set format.\n");
return NULL;
}
if (snd_pcm_hw_params_set_rate_near(mhandle, hwparams, &exactrate, 0)<0){
fprintf(stderr, "Couldn't set frequency.\n");
return NULL;
}
if (*frequency != exactrate){
fprintf(stderr, "Playback frequency %dHz is not available...\n"
"Using %dHz instead.\n",*frequency,exactrate);
*frequency=exactrate;
}
if (snd_pcm_hw_params_set_channels_near(mhandle, hwparams, channels)<0){
fprintf(stderr, "Couldn't set channels number.\n");
return NULL;
}
if(*channels>2){
fprintf(stderr,"Channels number should be 1(mono) or 2(stereo).\n");
return NULL;
}
if (snd_pcm_hw_params_set_periods_near(mhandle,hwparams,&periods,0)<0){
fprintf(stderr, "Couldn't set periods.\n");
return NULL;
}
if (snd_pcm_hw_params_set_buffer_size_near(mhandle,hwparams,buffsize)<0){
fprintf(stderr, "Couldn't set buffer size.\n");
return NULL;
}
if (snd_pcm_hw_params(mhandle,hwparams)<0){
fprintf(stderr, "Couldn't set hardware parameters.\n");
return NULL;
}
if(hard_pause!=NULL)
if(!snd_pcm_hw_params_can_pause(hwparams)){
*hard_pause=1;
}
if(periodsize!=NULL)
snd_pcm_hw_params_get_period_size(hwparams,periodsize,0);
if(periodtime!=NULL)
snd_pcm_hw_params_get_period_time(hwparams,periodtime,0);
fprintf(stderr,"Recording on device %s is set to:\n%d channels at %dHz\n",
pcm_dev,*channels,*frequency);
snd_pcm_prepare(mhandle);
return mhandle;
}
#else
int OpenDev( const char *pcm_dev,
unsigned int channels,
unsigned int frequency){
int fd ;
fd=open(pcm_dev,O_RDONLY);
if(fd!=-1){
unsigned int value;
if(ioctl(fd,SNDCTL_DSP_GETFMTS,&value)<0){
fprintf(stderr,"Couldn't get audio format list\n");
return -1;
}
if(value & AFMT_S16_LE){
value=AFMT_S16_LE;
}
else if(value & AFMT_S16_BE){
value=AFMT_S16_BE;
}
else{
fprintf(stderr,"Soundcard doesn't support signed 16-bit-data\n");
return -1;
}
if(ioctl(fd,SNDCTL_DSP_SETFMT,&value)<0){
fprintf(stderr,"Couldn't set audio format\n" );
return -1;
}
value = channels;
if(ioctl(fd,SNDCTL_DSP_CHANNELS,&value)<0){
fprintf(stderr,"Cannot set the number of channels\n" );
return -1;
}
value = frequency;
if(ioctl(fd,SNDCTL_DSP_SPEED,&value)<0){
fprintf(stderr,"Couldn't set audio frequency\n" );
return -1;
}
if(fcntl(fd,F_SETFL,fcntl(fd,F_GETFL) & ~O_NONBLOCK)<0){
fprintf(stderr,"Couldn't set audio blocking mode\n" );
return -1;
}
}
return fd;
}
#endif
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