Added switches API and rawmidi API...

src/rawmidi/rawmidi.c

@@ -0,0 +1,274 @@
+/*
+ *  RawMIDI 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 <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include "soundlib.h"
+
+#define SND_FILE_RAWMIDI	"/dev/snd/rawmidi%i%i"
+#define SND_PCM_VERSION_MAX	SND_PROTOCOL_VERSION( 1, 0, 0 )
+ 
+typedef struct {
+  int card;
+  int device;
+  int fd;
+} snd_rawmidi_t;
+ 
+int snd_rawmidi_open( void **handle, int card, int device, int mode )
+{
+  int fd, ver;
+  char filename[32];
+  snd_rawmidi_t *rmidi;
+
+  *handle = NULL;
+  if ( card < 0 || card >= SND_CARDS ) return -EINVAL;
+  sprintf( filename, SND_FILE_RAWMIDI, card, device );
+  if ( (fd = open( filename, mode )) < 0 ) return -errno;
+  if ( ioctl( fd, SND_PCM_IOCTL_PVERSION, &ver ) < 0 ) {
+    close( fd );
+    return -errno;
+  }
+  if ( SND_PROTOCOL_UNCOMPATIBLE( ver, SND_PCM_VERSION_MAX ) )
+    return -SND_ERROR_UNCOMPATIBLE_VERSION;
+  rmidi = (snd_rawmidi_t *)calloc( 1, sizeof( snd_rawmidi_t ) );
+  if ( rmidi == NULL ) {
+    close( fd );
+    return -ENOMEM;
+  }
+  rmidi -> card = card;
+  rmidi -> device = device;
+  rmidi -> fd = fd;
+  *handle = rmidi;
+  return 0;
+}
+
+int snd_rawmidi_close( void *handle )
+{
+  snd_rawmidi_t *rmidi;
+  int res;
+  
+  rmidi = (snd_rawmidi_t *)handle;
+  if ( !rmidi ) return -EINVAL;
+  res = close( rmidi -> fd ) < 0 ? -errno : 0;
+  free( rmidi );
+  return res;
+}
+
+int snd_rawmidi_file_descriptor( void *handle )
+{
+  snd_rawmidi_t *rmidi;
+  
+  rmidi = (snd_rawmidi_t *)handle;
+  if ( !rmidi ) return -EINVAL;
+  return rmidi -> fd;
+}
+
+int snd_rawmidi_block_mode( void *handle, int enable )
+{
+  snd_rawmidi_t *rmidi;
+  long flags;
+  
+  rmidi = (snd_rawmidi_t *)handle;
+  if ( !rmidi ) return -EINVAL;
+  if ( fcntl( rmidi -> fd, F_GETFL, &flags ) < 0 )
+    return -errno;
+  if ( enable )
+    flags |= O_NONBLOCK;
+   else
+    flags &= ~O_NONBLOCK;
+  if ( fcntl( rmidi -> fd, F_SETFL, &flags ) < 0 )
+    return -errno;
+  return 0;
+}
+
+int snd_rawmidi_info( void *handle, snd_rawmidi_info_t *info )
+{
+  snd_rawmidi_t *rmidi;
+  
+  rmidi = (snd_rawmidi_t *)handle;
+  if ( !rmidi ) return -EINVAL;
+  if ( ioctl( rmidi -> fd, SND_RAWMIDI_IOCTL_INFO, info ) < 0 )
+    return -errno;
+  return 0;
+}
+
+int snd_rawmidi_switches( void *handle )
+{
+  snd_rawmidi_t *rmidi;
+  int result;
+
+  rmidi = (snd_rawmidi_t *)handle;
+  if ( !rmidi ) return -EINVAL;
+  if ( ioctl( rmidi -> fd, SND_RAWMIDI_IOCTL_SWITCHES, &result ) < 0 )
+    return -errno;
+  return result;
+}
+
+int snd_rawmidi_switch( void *handle, const char *switch_id )
+{
+  snd_rawmidi_t *rmidi;
+  snd_rawmidi_switch_t uswitch;
+  int idx, switches, err;
+
+  rmidi = (snd_rawmidi_t *)handle;
+  if ( !rmidi ) return -EINVAL;
+  /* bellow implementation isn't optimized for speed */
+  /* info about switches should be cached in the snd_mixer_t structure */
+  if ( (switches = snd_rawmidi_switches( handle )) < 0 )
+    return switches;
+  for ( idx = 0; idx < switches; idx++ ) {
+    if ( (err = snd_rawmidi_switch_read( handle, idx, &uswitch )) < 0 )
+      return err;
+    if ( !strncmp( switch_id, uswitch.name, sizeof( uswitch.name ) ) )
+      return idx;
+  }
+  return -EINVAL;
+}
+
+int snd_rawmidi_switch_read( void *handle, int switchn, snd_rawmidi_switch_t *data )
+{
+  snd_rawmidi_t *rmidi;
+
+  rmidi = (snd_rawmidi_t *)handle;
+  if ( !rmidi ) return -EINVAL;
+  data -> switchn = switchn;
+  if ( ioctl( rmidi -> fd, SND_RAWMIDI_IOCTL_SWITCH_READ, data ) < 0 )
+    return -errno;
+  return 0;
+}
+                
+int snd_rawmidi_switch_write( void *handle, int switchn, snd_rawmidi_switch_t *data )
+{
+  snd_rawmidi_t *rmidi;
+
+  rmidi = (snd_rawmidi_t *)handle;
+  if ( !rmidi ) return -EINVAL;
+  data -> switchn = switchn;
+  if ( ioctl( rmidi -> fd, SND_RAWMIDI_IOCTL_SWITCH_WRITE, data ) < 0 )
+    return -errno;
+  return 0;
+}                
+
+int snd_rawmidi_output_params( void *handle, snd_rawmidi_output_params_t *params )
+{
+  snd_rawmidi_t *rmidi;
+  
+  rmidi = (snd_rawmidi_t *)handle;
+  if ( !rmidi ) return -EINVAL;
+  if ( ioctl( rmidi -> fd, SND_RAWMIDI_IOCTL_OUTPUT_PARAMS, params ) < 0 )
+    return -errno;
+  return 0;
+}
+
+int snd_rawmidi_input_params( void *handle, snd_rawmidi_input_params_t *params )
+{
+  snd_rawmidi_t *rmidi;
+  
+  rmidi = (snd_rawmidi_t *)handle;
+  if ( !rmidi ) return -EINVAL;
+  if ( ioctl( rmidi -> fd, SND_RAWMIDI_IOCTL_INPUT_PARAMS, params ) < 0 )
+    return -errno;
+  return 0;
+}
+
+int snd_rawmidi_output_status( void *handle, snd_rawmidi_output_status_t *status )
+{
+  snd_rawmidi_t *rmidi;
+  
+  rmidi = (snd_rawmidi_t *)handle;
+  if ( !rmidi ) return -EINVAL;
+  if ( ioctl( rmidi -> fd, SND_RAWMIDI_IOCTL_OUTPUT_STATUS, status ) < 0 )
+    return -errno;
+  return 0;
+}
+
+int snd_rawmidi_input_status( void *handle, snd_rawmidi_input_status_t *status )
+{
+  snd_rawmidi_t *rmidi;
+  
+  rmidi = (snd_rawmidi_t *)handle;
+  if ( !rmidi ) return -EINVAL;
+  if ( ioctl( rmidi -> fd, SND_RAWMIDI_IOCTL_INPUT_STATUS, status ) < 0 )
+    return -errno;
+  return 0;
+}
+
+int snd_rawmidi_drain_output( void *handle )
+{
+  snd_rawmidi_t *rmidi;
+  
+  rmidi = (snd_rawmidi_t *)handle;
+  if ( !rmidi ) return -EINVAL;
+  if ( ioctl( rmidi -> fd, SND_RAWMIDI_IOCTL_DRAIN_OUTPUT ) < 0 )
+    return -errno;
+  return 0;
+}
+
+int snd_rawmidi_flush_output( void *handle )
+{
+  snd_rawmidi_t *rmidi;
+  
+  rmidi = (snd_rawmidi_t *)handle;
+  if ( !rmidi ) return -EINVAL;
+  if ( ioctl( rmidi -> fd, SND_RAWMIDI_IOCTL_FLUSH_OUTPUT ) < 0 )
+    return -errno;
+  return 0;
+}
+
+int snd_rawmidi_flush_input( void *handle )
+{
+  snd_rawmidi_t *rmidi;
+  
+  rmidi = (snd_rawmidi_t *)handle;
+  if ( !rmidi ) return -EINVAL;
+  if ( ioctl( rmidi -> fd, SND_RAWMIDI_IOCTL_FLUSH_INPUT ) < 0 )
+    return -errno;
+  return 0;
+}
+
+ssize_t snd_rawmidi_write( void *handle, const void *buffer, size_t size )
+{
+  snd_rawmidi_t *rmidi;
+  ssize_t result;
+  
+  rmidi = (snd_rawmidi_t *)handle;
+  if ( !rmidi ) return -EINVAL;
+  result = write( rmidi -> fd, buffer, size );
+  if ( result < 0 ) return -errno;
+  return result;
+}
+
+ssize_t snd_rawmidi_read( void *handle, void *buffer, size_t size )
+{
+  snd_rawmidi_t *rmidi;
+  ssize_t result;
+  
+  rmidi = (snd_rawmidi_t *)handle;
+  if ( !rmidi ) return -EINVAL;
+  result = read( rmidi -> fd, buffer, size );
+  if ( result < 0 ) return -errno;
+  return result;
+}