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/*********************************************************************************
* recordMyDesktop *
**********************************************************************************
* *
* Copyright (C) 2006 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 <recordmydesktop.h>
snd_pcm_t *OpenDev(const char *pcm_dev,unsigned int *channels,unsigned int *frequency,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;
snd_pcm_hw_params_alloca(&hwparams);
snd_pcm_uframes_t buffsize=4096;
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;
}
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...\nUsing %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;
}
buffsize=(exactrate*(*channels))/2;
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)){
// fprintf(stderr, "Current sound device doesn't seem to support pausing!\nI will attempt to close/reopen device in case you opt to pause during recording.\n");
*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;
}
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