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Viewing changes to mediastreamer/msossread.c

  • Committer: Bazaar Package Importer
  • Author(s): Samuel Mimram
  • Date: 2004-06-30 13:58:16 UTC
  • Revision ID: james.westby@ubuntu.com-20040630135816-wwx75gdlodkqbabb
Tags: upstream-0.12.2
Import upstream version 0.12.2

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mediastreamer/msossread.c
 
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/*
 
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  The mediastreamer library aims at providing modular media processing and I/O
 
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        for linphone, but also for any telephony application.
 
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  Copyright (C) 2001  Simon MORLAT simon.morlat@linphone.org
 
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  This library is free software; you can redistribute it and/or
 
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  modify it under the terms of the GNU Lesser General Public
 
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  License as published by the Free Software Foundation; either
 
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  version 2.1 of the License, or (at your option) any later version.
 
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  This library is distributed in the hope that it will be useful,
 
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  but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 
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  Lesser General Public License for more details.
 
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  You should have received a copy of the GNU Lesser General Public
 
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  License along with this library; if not, write to the Free Software
 
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  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
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*/
 
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#include "msossread.h"
 
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#include "mssync.h"
 
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#include <unistd.h>
 
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#include <errno.h>
 
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#include <sys/time.h>
 
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#include <sys/types.h>
 
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MSFilterInfo oss_read_info={
 
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        "OSS read",
 
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        0,
 
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        MS_FILTER_AUDIO_IO,
 
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        ms_oss_read_new,
 
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        NULL
 
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};
 
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static MSOssReadClass *msossreadclass=NULL;
 
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MSFilter * ms_oss_read_new()
 
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{
 
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        MSOssRead *w;
 
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        if (msossreadclass==NULL)
 
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        {
 
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                msossreadclass=g_new(MSOssReadClass,1);
 
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                ms_oss_read_class_init( msossreadclass );
 
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        }
 
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        w=g_new(MSOssRead,1);
 
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        MS_FILTER(w)->klass=MS_FILTER_CLASS(msossreadclass);
 
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        ms_oss_read_init(w);
 
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        return(MS_FILTER(w));
 
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}
 
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/* FOR INTERNAL USE*/
 
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void ms_oss_read_init(MSOssRead *w)
 
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{
 
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        ms_sound_read_init(MS_SOUND_READ(w));
 
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        MS_FILTER(w)->outfifos=w->f_outputs;
 
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        MS_FILTER(w)->outfifos[0]=NULL;
 
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        w->devid=0;
 
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        w->sndcard=NULL;
 
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        w->freq=8000;
 
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}
 
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gint ms_oss_read_set_property(MSOssRead *f,MSFilterProperty prop, void *value)
 
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{
 
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        switch(prop){
 
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                case MS_FILTER_PROPERTY_FREQ:
 
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                        f->freq=((gint*)value)[0];
 
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                break;
 
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        }
 
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        return 0;
 
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}
 
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void ms_oss_read_class_init(MSOssReadClass *klass)
 
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{
 
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        ms_sound_read_class_init(MS_SOUND_READ_CLASS(klass));
 
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        MS_FILTER_CLASS(klass)->max_foutputs=1;  /* one fifo output only */
 
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        MS_FILTER_CLASS(klass)->setup=(MSFilterSetupFunc)ms_oss_read_setup;
 
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        MS_FILTER_CLASS(klass)->unsetup=(MSFilterSetupFunc)ms_oss_read_stop;
 
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        MS_FILTER_CLASS(klass)->process= (MSFilterProcessFunc)ms_oss_read_process;
 
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        MS_FILTER_CLASS(klass)->set_property=(MSFilterPropertyFunc)ms_oss_read_set_property;
 
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        MS_FILTER_CLASS(klass)->destroy= (MSFilterDestroyFunc)ms_oss_read_destroy;
 
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        MS_FILTER_CLASS(klass)->w_maxgran=MS_OSS_READ_MAX_GRAN;
 
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        MS_FILTER_CLASS(klass)->info=&oss_read_info;
 
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        MS_SOUND_READ_CLASS(klass)->set_device=(gint (*)(MSSoundRead*,gint))ms_oss_read_set_device;
 
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        MS_SOUND_READ_CLASS(klass)->start=(void (*)(MSSoundRead*))ms_oss_read_start;
 
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        MS_SOUND_READ_CLASS(klass)->stop=(void (*)(MSSoundRead*))ms_oss_read_stop;
 
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        ms_filter_class_set_name(MS_FILTER_CLASS(klass),"OssRead");
 
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        //ms_filter_class_set_attr( MS_FILTER_CLASS(klass),FILTER_CAN_SYNC|FILTER_IS_SOURCE);   
 
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}
 
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void ms_oss_read_destroy( MSOssRead *obj)
 
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{
 
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        g_free(obj);
 
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}
 
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void ms_oss_read_process(MSOssRead *f)
 
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{
 
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        MSFifo *fifo;
 
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        char *p;
 
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        fifo=f->f_outputs[0];
 
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        g_return_if_fail(f->sndcard!=NULL);
 
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        g_return_if_fail(f->gran>0);
 
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        if (snd_card_can_read(f->sndcard)){
 
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                ms_fifo_get_write_ptr(fifo,f->gran,(void**)&p);
 
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                g_return_if_fail(p!=NULL);
 
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                snd_card_read(f->sndcard,p,f->gran);
 
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        }               
 
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}
 
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void ms_oss_read_start(MSOssRead *r)
 
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{
 
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        g_return_if_fail(r->devid!=-1);
 
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        r->sndcard=snd_card_manager_get_card(snd_card_manager,r->devid);
 
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        g_return_if_fail(r->sndcard!=NULL);
 
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        /* open the device for an audio telephony signal with minimum latency */
 
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        snd_card_open_r(r->sndcard,16,0,r->freq);
 
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        r->gran=(512*r->freq)/8000;
 
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}
 
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void ms_oss_read_stop(MSOssRead *w)
 
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{
 
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        g_return_if_fail(w->devid!=-1);
 
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        g_return_if_fail(w->sndcard!=NULL);
 
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        snd_card_close_r(w->sndcard);
 
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        w->sndcard=NULL;
 
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}
 
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void ms_oss_read_setup(MSOssRead *f, MSSync *sync)
 
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{
 
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        f->sync=sync;
 
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        ms_oss_read_start(f);
 
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}
 
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gint ms_oss_read_set_device(MSOssRead *r,gint devid)
 
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{
 
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        r->devid=devid;
 
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        return 0;
 
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}