148 lines
3.7 KiB
C
148 lines
3.7 KiB
C
/*
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Emix - A small audio mixer Epplet
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Roberto Machorro <rmach@bigfoot.com>
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This is a GPL Licensed program, you know the deal.
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*/
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#include "epplet.h"
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#include <sys/ioctl.h>
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#include <sys/soundcard.h>
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int open_mixer(void);
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int read_volume(int);
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void set_volume(void *);
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void initialize_channels(void);
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#define MIXER_DEV "/dev/mixer"
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typedef struct _MIX_CHANNEL {
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int id;
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int value;
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} MIX_CHANNEL;
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int fd_mixer = 0;
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int msk_mixerdevs = 0;
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MIX_CHANNEL channels[4];
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int mute_status = 0;
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Epplet_gadget b_mute;
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static void cb_close(void *data)
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{
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Epplet_unremember();
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close(fd_mixer);
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data = NULL;
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exit(0);
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}
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static void cb_help(void *data)
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{
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data = NULL;
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Epplet_show_about("Emix");
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}
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static void toggle_mute(void *data)
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{
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unsigned char lrvl[4];
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MIX_CHANNEL *dev = (MIX_CHANNEL *)data;
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if (mute_status) {
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lrvl[0] = lrvl[1] = 0;
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} else {
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lrvl[0] = (20 - (unsigned char)dev->value) * 5;
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lrvl[1] = lrvl[0];
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}
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lrvl[2] = lrvl[3] = 0;
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ioctl(fd_mixer, MIXER_WRITE(dev->id), lrvl);
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}
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int open_mixer(void)
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{
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if ((fd_mixer = open(MIXER_DEV, O_RDWR)) < 0) {
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fprintf(stderr, "Mixer device open failed...\n");
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return 0;
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}
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if (ioctl(fd_mixer, SOUND_MIXER_READ_DEVMASK, &msk_mixerdevs) == -1) {
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fprintf(stderr, "Mixer device mask read failed...\n");
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return 0;
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}
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return 1;
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}
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int read_volume(int channel)
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{
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unsigned char lrvl[4];
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if (ioctl(fd_mixer, MIXER_READ(channels[channel].id), lrvl) == -1) {
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fprintf(stderr, "Error reading volume for channel #%d\n",
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channel);
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return 0;
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}
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channels[channel].value = (100 - (lrvl[0] + lrvl[1])/2) / 5;
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return channels[channel].value;
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}
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void set_volume(void *data)
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{
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unsigned char lrvl[4];
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MIX_CHANNEL *dev = (MIX_CHANNEL *)data;
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if (mute_status) {
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mute_status = 0;
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toggle_mute(&channels[0]);
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Epplet_gadget_data_changed(b_mute);
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}
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lrvl[0] = (20 - (unsigned char)dev->value) * 5;
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lrvl[1] = lrvl[0];
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lrvl[2] = lrvl[3] = 0;
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ioctl(fd_mixer, MIXER_WRITE(dev->id), lrvl);
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}
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void initialize_channels(void)
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{
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channels[0].id = SOUND_MIXER_VOLUME;
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channels[0].value = read_volume(0);
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channels[1].id = SOUND_MIXER_SYNTH;
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channels[1].value = read_volume(1);
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channels[2].id = SOUND_MIXER_PCM;
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channels[2].value = read_volume(2);
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channels[3].id = SOUND_MIXER_LINE;
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channels[3].value = read_volume(3);
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}
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int main(int argc, char *argv[])
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{
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Epplet_gadget vs_master, vs_pcm, vs_lin, vs_cda, b_close, b_help;
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if (!open_mixer())
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return 1;
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initialize_channels();
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atexit(Epplet_cleanup);
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Epplet_Init("Emix", "0.9", "Audio mixer Epplet", 3, 3, argc, argv, 0);
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vs_master = Epplet_create_vslider(2, 2, 44, 0, 20, 1, 5,
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&channels[0].value, set_volume, &channels[0]);
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vs_pcm = Epplet_create_vslider(10, 2, 44, 0, 20, 1, 5,
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&channels[1].value, set_volume, &channels[1]);
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vs_lin = Epplet_create_vslider(18, 2, 44, 0, 20, 1, 5,
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&channels[2].value, set_volume, &channels[2]);
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vs_cda = Epplet_create_vslider(26, 2, 44, 0, 20, 1, 5,
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&channels[3].value, set_volume, &channels[3]);
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b_close = Epplet_create_button(NULL, NULL, 34, 3, 0, 0, "CLOSE", 0,
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NULL, cb_close, NULL);
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b_mute = Epplet_create_togglebutton("M", NULL, 34, 18, 12, 12,
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&mute_status, toggle_mute, &channels[0]);
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b_help = Epplet_create_button(NULL, NULL, 34, 33, 0, 0, "HELP", 0,
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NULL, cb_help, NULL);
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Epplet_gadget_show(vs_master);
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Epplet_gadget_show(vs_pcm);
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Epplet_gadget_show(vs_lin);
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Epplet_gadget_show(vs_cda);
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Epplet_gadget_show(b_close);
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Epplet_gadget_show(b_mute);
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Epplet_gadget_show(b_help);
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Epplet_show();
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Epplet_Loop();
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return 0;
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}
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