mirror of
https://github.com/alsa-project/alsa-utils
synced 2024-09-19 17:49:59 +02:00
129 lines
2.8 KiB
C++
129 lines
2.8 KiB
C++
/*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/asoundlib.h>
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#include "amixer.h"
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Mixer::Mixer(int card, int device)
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{
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mixer_handle = NULL;
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if (snd_mixer_open(&mixer_handle, card, device) < 0) {
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fprintf(stderr, "Can't access mixer %i/%i\n", card+1, device);
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mixer_status = ~E_MIXER_SUCCESS;
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return;
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}
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mixer_status = E_MIXER_SUCCESS;
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mixer_status |= E_MIXER_NEED_CLOSE;
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}
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bool Mixer::Open(int card, int device)
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{
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Close();
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if (snd_mixer_open(&mixer_handle, card, device) < 0) {
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fprintf(stderr, "Can't access mixer %i/%i\n", card + 1, device);
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mixer_status = ~E_MIXER_SUCCESS;
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} else{
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mixer_status = E_MIXER_SUCCESS;
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mixer_status |= E_MIXER_NEED_CLOSE;
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}
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return Init();
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}
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void Mixer::Close()
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{
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if (mixer_handle != NULL && mixer_status & E_MIXER_NEED_CLOSE) {
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snd_mixer_close(mixer_handle);
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}
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mixer_handle = NULL;
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mixer_status = ~E_MIXER_SUCCESS;
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}
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Mixer::~Mixer()
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{
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Close();
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}
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bool Mixer::Init()
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{
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if (!(mixer_status & E_MIXER_SUCCESS))
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return false;
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if ((nr_devices = snd_mixer_channels(mixer_handle)) < 0)
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return false;
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return true;
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}
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char* Mixer::Name()
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{
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return Name(current_device);
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}
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char* Mixer::Name(int32 device)
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{
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if (snd_mixer_channel_info(mixer_handle,device,&ch_info) < 0)
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return "Unknown";
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return (char *)ch_info.name;
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}
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void Mixer::Update()
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{
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if(snd_mixer_channel_read(mixer_handle, current_device, &ch_data) < 0) {
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fprintf(stderr, "Can't read data from channel %i\n", current_device);
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return; /* No fail code? */
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}
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}
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void Mixer::DeviceRead(int32 device, int32 *left, int32 *right, int32 *flags)
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{
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current_device = device;
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Update();
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*left = ch_data.left;
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*right = ch_data.right;
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*flags = ch_data.flags;
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}
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void Mixer::DeviceWrite(int32 device, int32 left, int32 right, int32 flags)
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{
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current_device = device;
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ch_data.channel = device;
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ch_data.left = left;
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ch_data.right = right;
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ch_data.flags = flags;
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if(snd_mixer_channel_write(mixer_handle, device, &ch_data) < 0) {
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fprintf(stderr, "Can't write data to channel %i\n", device);
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return; /* No fail code? */
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}
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}
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