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path: root/recordmydesktop/src/opendev.c
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/******************************************************************************
*                            recordMyDesktop                                  *
*******************************************************************************
*                                                                             *
*            Copyright (C) 2006,2007 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 *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;
    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);
    fprintf(stderr,"Buffer size set to %d frames.\n",(int)(*buffsize));
    snd_pcm_prepare(mhandle);

    return mhandle;
}
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