mirrors/alsa-lib
1
0
Fork 0
mirror of https://github.com/alsa-project/alsa-lib.git synced 2025-11-02 09:01:48 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions
alsa-lib/src/control/control.c
Jaroslav Kysela e4572ec719 Reset all protocol versions to 1.0.0.
1999-12-16 14:14:16 +00:00

501 lines
12 KiB
C
Raw Blame History

/*
* Control Interface - main file
* Copyright (c) 1998 by Jaroslav Kysela <perex@suse.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 "asoundlib.h"
#define SND_FILE_CONTROL "/dev/snd/controlC%i"
#define SND_CTL_VERSION_MAX SND_PROTOCOL_VERSION(1, 0, 0)
struct snd_ctl {
int card;
int fd;
};
int snd_ctl_open(snd_ctl_t **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) {
snd_card_load(card);
if ((fd = open(filename, O_RDWR)) < 0)
return -errno;
}
if (ioctl(fd, SND_CTL_IOCTL_PVERSION, &ver) < 0) {
close(fd);
return -errno;
}
if (SND_PROTOCOL_INCOMPATIBLE(ver, SND_CTL_VERSION_MAX)) {
close(fd);
return -SND_ERROR_INCOMPATIBLE_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(snd_ctl_t *handle)
{
snd_ctl_t *ctl;
int res;
ctl = handle;
if (!ctl)
return -EINVAL;
res = close(ctl->fd) < 0 ? -errno : 0;
free(ctl);
return res;
}
int snd_ctl_file_descriptor(snd_ctl_t *handle)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl)
return -EINVAL;
return ctl->fd;
}
int snd_ctl_hw_info(snd_ctl_t *handle, struct snd_ctl_hw_info *info)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !info)
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_HW_INFO, info) < 0)
return -errno;
return 0;
}
int snd_ctl_switch_list(snd_ctl_t *handle, snd_switch_list_t *list)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !list)
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_SWITCH_LIST, list) < 0)
return -errno;
return 0;
}
int snd_ctl_switch_read(snd_ctl_t *handle, snd_switch_t *sw)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !sw || sw->name[0] == '\0')
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_SWITCH_READ, sw) < 0)
return -errno;
return 0;
}
int snd_ctl_switch_write(snd_ctl_t *handle, snd_switch_t *sw)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !sw || sw->name[0] == '\0')
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_SWITCH_WRITE, sw) < 0)
return -errno;
return 0;
}
int snd_ctl_hwdep_info(snd_ctl_t *handle, int dev, snd_hwdep_info_t * info)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !info || dev < 0)
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_HWDEP_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_HWDEP_INFO, info) < 0)
return -errno;
return 0;
}
int snd_ctl_pcm_info(snd_ctl_t *handle, int dev, snd_pcm_info_t * info)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !info || dev < 0)
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_channel_info(snd_ctl_t *handle, int dev, int subdev, snd_pcm_channel_info_t * info)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !info || dev < 0 || subdev < 0)
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_PCM_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_PCM_SUBDEVICE, &subdev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_PCM_CHANNEL_INFO, info) < 0)
return -errno;
return 0;
}
int snd_ctl_pcm_prefer_subdevice(snd_ctl_t *handle, int dev, int subdev)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || dev < 0)
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_PCM_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_PCM_PREFER_SUBDEVICE, &subdev) < 0)
return -errno;
return 0;
}
int snd_ctl_pcm_playback_switch_list(snd_ctl_t *handle, int dev, snd_switch_list_t *list)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || dev < 0 || !list)
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_PCM_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_PCM_PSWITCH_LIST, list) < 0)
return -errno;
return 0;
}
int snd_ctl_pcm_playback_switch_read(snd_ctl_t *handle, int dev, snd_switch_t * sw)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !sw || dev < 0 || sw->name[0] == '\0')
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_PCM_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_PCM_PSWITCH_READ, sw) < 0)
return -errno;
return 0;
}
int snd_ctl_pcm_playback_switch_write(snd_ctl_t *handle, int dev, snd_switch_t * sw)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !sw || dev < 0 || sw->name[0] == '\0')
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_PCM_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_PCM_PSWITCH_WRITE, sw) < 0)
return -errno;
return 0;
}
int snd_ctl_pcm_capture_switch_list(snd_ctl_t *handle, int dev, snd_switch_list_t * list)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !list || dev < 0)
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_PCM_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_PCM_CSWITCH_LIST, list) < 0)
return -errno;
return 0;
}
int snd_ctl_pcm_capture_switch_read(snd_ctl_t *handle, int dev, snd_switch_t * sw)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !sw || dev < 0 || sw->name[0] == '\0')
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_PCM_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_PCM_CSWITCH_READ, sw) < 0)
return -errno;
return 0;
}
int snd_ctl_pcm_capture_switch_write(snd_ctl_t *handle, int dev, snd_switch_t * sw)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !sw || dev < 0 || sw->name[0] == '\0')
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_PCM_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_PCM_CSWITCH_WRITE, sw) < 0)
return -errno;
return 0;
}
int snd_ctl_mixer_info(snd_ctl_t *handle, int dev, snd_mixer_info_t * info)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !info || dev < 0)
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;
}
int snd_ctl_mixer_switch_list(snd_ctl_t *handle, int dev, snd_switch_list_t * list)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !list || dev < 0)
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_MIXER_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_MIXER_SWITCH_LIST, list) < 0)
return -errno;
return 0;
}
int snd_ctl_mixer_switch_read(snd_ctl_t *handle, int dev, snd_switch_t * sw)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !sw || dev < 0 || sw->name[0] == '\0')
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_MIXER_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_MIXER_SWITCH_READ, sw) < 0)
return -errno;
return 0;
}
int snd_ctl_mixer_switch_write(snd_ctl_t *handle, int dev, snd_switch_t * sw)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !sw || dev < 0 || sw->name[0] == '\0')
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_MIXER_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_MIXER_SWITCH_WRITE, sw) < 0)
return -errno;
return 0;
}
int snd_ctl_rawmidi_info(snd_ctl_t *handle, int dev, snd_rawmidi_info_t * info)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !info)
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_INFO, info) < 0)
return -errno;
return 0;
}
int snd_ctl_rawmidi_output_info(snd_ctl_t *handle, int dev, snd_rawmidi_output_info_t * info)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !info || dev < 0)
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_OUTPUT_INFO, info) < 0)
return -errno;
return 0;
}
int snd_ctl_rawmidi_input_info(snd_ctl_t *handle, int dev, snd_rawmidi_input_info_t * info)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !info || dev < 0)
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_INPUT_INFO, info) < 0)
return -errno;
return 0;
}
int snd_ctl_rawmidi_output_switch_list(snd_ctl_t *handle, int dev, snd_switch_list_t *list)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !list || dev < 0)
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_OSWITCH_LIST, list) < 0)
return -errno;
return 0;
}
int snd_ctl_rawmidi_output_switch_read(snd_ctl_t *handle, int dev, snd_switch_t * sw)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !sw || dev < 0 || sw->name[0] == '\0')
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_OSWITCH_READ, sw) < 0)
return -errno;
return 0;
}
int snd_ctl_rawmidi_output_switch_write(snd_ctl_t *handle, int dev, snd_switch_t * sw)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !sw || dev < 0 || sw->name[0] == '\0')
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_OSWITCH_WRITE, sw) < 0)
return -errno;
return 0;
}
int snd_ctl_rawmidi_input_switch_list(snd_ctl_t *handle, int dev, snd_switch_list_t *list)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !list || dev < 0)
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_ISWITCH_LIST, list) < 0)
return -errno;
return 0;
}
int snd_ctl_rawmidi_input_switch_read(snd_ctl_t *handle, int dev, snd_switch_t * sw)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !sw || dev < 0 || sw->name[0] == '\0')
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_ISWITCH_READ, sw) < 0)
return -errno;
return 0;
}
int snd_ctl_rawmidi_input_switch_write(snd_ctl_t *handle, int dev, snd_switch_t * sw)
{
snd_ctl_t *ctl;
ctl = handle;
if (!ctl || !sw || dev < 0 || sw->name[0] == '\0')
return -EINVAL;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_DEVICE, &dev) < 0)
return -errno;
if (ioctl(ctl->fd, SND_CTL_IOCTL_RAWMIDI_ISWITCH_WRITE, sw) < 0)
return -errno;
return 0;
}
int snd_control_read(snd_ctl_t *handle, snd_ctl_callbacks_t * callbacks)
{
snd_ctl_t *ctl;
int result, count;
snd_ctl_read_t r;
ctl = handle;
if (!ctl)
return -EINVAL;
count = 0;
while ((result = read(ctl->fd, &r, sizeof(r))) > 0) {
if (result != sizeof(r))
return -EIO;
if (!callbacks)
continue;
switch (r.cmd) {
case SND_CTL_READ_REBUILD:
if (callbacks->rebuild)
callbacks->rebuild(callbacks->private_data);
break;
case SND_CTL_READ_SWITCH_VALUE:
case SND_CTL_READ_SWITCH_CHANGE:
case SND_CTL_READ_SWITCH_ADD:
case SND_CTL_READ_SWITCH_REMOVE:
if (callbacks->xswitch)
callbacks->xswitch(callbacks->private_data, r.cmd, r.data.sw.iface, &r.data.sw.switem);
break;
}
count++;
}
return result >= 0 ? count : -errno;
}
Reference in a new issue View git blame Copy permalink