Initial revision

src/control/control.c

@@ -0,0 +1,146 @@
+/*
+ *  Control Interface - main file
+ *  Copyright (c) 1998 by Jaroslav Kysela <perex@jcu.cz>
+ *
+ *
+ *   This library is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU Library 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 Library General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Library General Public
+ *   License along with this library; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include "soundlib.h"
+
+#define SND_FILE_CONTROL	"/dev/sndcontrol%i"
+#define SND_CTL_VERSION_MAX	SND_PROTOCOL_VERSION( 1, 0, 0 )
+ 
+typedef struct {
+  int card;
+  int fd;
+} snd_ctl_t;
+ 
+int snd_ctl_open( void **handle, int card )
+{
+  int fd, ver;
+  char filename[32];
+  snd_ctl_t *ctl;
+
+  *handle = NULL;
+  if ( card < 0 || card >= SND_CARDS ) return -EINVAL;
+  sprintf( filename, SND_FILE_CONTROL, card );
+  if ( (fd = open( filename, O_RDWR )) < 0 ) return -errno;
+  if ( ioctl( fd, SND_CTL_IOCTL_PVERSION, &ver ) < 0 ) {
+    close( fd );
+    return -errno;
+  }
+  if ( ver > SND_CTL_VERSION_MAX ) return -SND_ERROR_UNCOMPATIBLE_VERSION;
+  ctl = (snd_ctl_t *)calloc( 1, sizeof( snd_ctl_t ) );
+  if ( ctl == NULL ) {
+    close( fd );
+    return -ENOMEM;
+  }
+  ctl -> card = card;
+  ctl -> fd = fd;
+  *handle = ctl;
+  return 0;
+}
+
+int snd_ctl_close( void *handle )
+{
+  snd_ctl_t *ctl;
+  int res;
+  
+  ctl = (snd_ctl_t *)handle;
+  if ( !ctl ) return -EINVAL;
+  res = close( ctl -> fd ) < 0 ? -errno : 0;
+  free( ctl );
+  return res;
+}
+
+int snd_ctl_file_descriptor( void *handle )
+{
+  snd_ctl_t *ctl;
+  
+  ctl = (snd_ctl_t *)handle;
+  if ( !ctl ) return -EINVAL;
+  return ctl -> fd;
+}
+
+int snd_ctl_hw_info( void *handle, struct snd_ctl_hw_info *info )
+{
+  snd_ctl_t *ctl;
+  
+  ctl = (snd_ctl_t *)handle;
+  if ( !ctl ) return -EINVAL;
+  if ( ioctl( ctl -> fd, SND_CTL_IOCTL_HW_INFO, info ) < 0 )
+    return -errno;
+  return 0;
+}
+
+int snd_ctl_pcm_info( void *handle, int dev, snd_pcm_info_t *info )
+{
+  snd_ctl_t *ctl;
+  
+  ctl = (snd_ctl_t *)handle;
+  if ( !ctl ) return -EINVAL;
+  if ( ioctl( ctl -> fd, SND_CTL_IOCTL_PCM_DEVICE, &dev ) < 0 )
+    return -errno;
+  if ( ioctl( ctl -> fd, SND_CTL_IOCTL_PCM_INFO, info ) < 0 )
+    return -errno;
+  return 0;
+}
+
+int snd_ctl_pcm_playback_info( void *handle, int dev, snd_pcm_playback_info_t *info )
+{
+  snd_ctl_t *ctl;
+  
+  ctl = (snd_ctl_t *)handle;
+  if ( !ctl ) return -EINVAL;
+  if ( ioctl( ctl -> fd, SND_CTL_IOCTL_PCM_DEVICE, &dev ) < 0 )
+    return -errno;
+  if ( ioctl( ctl -> fd, SND_CTL_IOCTL_PCM_PLAYBACK_INFO, info ) < 0 )
+    return -errno;
+  return 0;
+}
+
+int snd_ctl_pcm_record_info( void *handle, int dev, snd_pcm_record_info_t *info )
+{
+  snd_ctl_t *ctl;
+  
+  ctl = (snd_ctl_t *)handle;
+  if ( !ctl ) return -EINVAL;
+  if ( ioctl( ctl -> fd, SND_CTL_IOCTL_PCM_DEVICE, &dev ) < 0 )
+    return -errno;
+  if ( ioctl( ctl -> fd, SND_CTL_IOCTL_PCM_RECORD_INFO, info ) < 0 )
+    return -errno;
+  return 0;
+}
+
+int snd_ctl_mixer_info( void *handle, int dev, snd_mixer_info_t *info )
+{
+  snd_ctl_t *ctl;
+  
+  ctl = (snd_ctl_t *)handle;
+  if ( !ctl ) return -EINVAL;
+  if ( ioctl( ctl -> fd, SND_CTL_IOCTL_MIXER_DEVICE, &dev ) < 0 )
+    return -errno;
+  if ( ioctl( ctl -> fd, SND_CTL_IOCTL_MIXER_INFO, info ) < 0 )
+    return -errno;
+  return 0;
+}