alsa-utils/amixer/amain.cpp

/*
 * Copyright 1998, Andy Lo A Foe <arloafoe@cs.vu.nl>
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/soundlib.h>
#include "amixer.h"

#define MIXER_RC ".amixerrc"

char *rc_file(void)
{
    static char rc_path[1024];
    char *p;
    
    p = getenv("HOME");
    if (p) {
	sprintf(rc_path, "%s/%s", p, MIXER_RC);
    } else {
	printf("Error reading HOME env. variable\n");
	return NULL;
    }
    return rc_path;
}

void copyright()
{
	printf("CLI ALSA Mixer v0.11 (c) 1998 Adnans\n\n");
}

void usage()
{
    printf("\n"
	   "Usage: amixer [-c card] [-d dev] device [vol|L:R] [mute|unmute] [rec|norec]\n\n"
	   "       amixer [-p path] -r\tRead %s or <path> settings\n"
	   "       amixer -w\t\tWrite %s settings\n"
	   "       amixer -q ...\t\tQuiet mode\n"
	   "       amixer -h\t\tHelp\n\n"
	   "Example: amixer line-out 80:50 unmute rec\n\n", rc_file(), rc_file());
}


void read_config(Mixer *mix, const char *path)
{
    FILE *rc;
    char buf[1024];
    int opt1;
    int opt2;
    int left, right;
    int dev;
    int count = 0;
    int flags;
    
    if ((rc = fopen(path ? path : rc_file(), "r")) == NULL) {
	printf("Mixer values not read\n");
	return;
    }
    while (!feof(rc) && fgets(buf, 1024, rc)) {
	count++;
	if (buf[0] == '\n')
	  continue;
	if (buf[0] == '#' || strlen(buf) == 0)
	  continue;
	
	if (sscanf(buf, "%d %d:%d %d %d\n", &dev, &left, &right, &opt1, &opt2) != 5) {
	    printf("WARNING: unable to make out line %d of .rc file -> \"%s\"\n", count, buf);
	    continue;
	}
	flags = 0;
	if (opt1) flags |= E_MIXER_MUTE;
	if (opt2) flags |= E_MIXER_RECORD;
	// Set mixer settings
	mix->DeviceSet(dev);
	mix->Write(left, right, flags);
    }
    
    fclose(rc);
    return;
}

void write_config(Mixer *mix)
{
    FILE *rc;
    int32 left, right, flags;    

    if ((rc = fopen(rc_file(), "w+")) == NULL) {
	printf("Mixer values not written\n");
	return;
    }
    fprintf(rc, "# CLI ALSA mixer settings file. Autogenerated\n"
	    "# Modify at your own risk :)\n\n");
    for (int i=0; i < mix->NumDevices(); i++) {
	mix->DeviceSet(i);
	mix->Read(&left, &right, &flags);
	fprintf(rc, "%d %d:%d %d %d\n", i, mix->Left(), mix->Right(), flags & E_MIXER_MUTE ? 1 : 0, flags & E_MIXER_RECORD ? 1 : 0);
    }
    fclose(rc);
    return;
}

int main(int argc, char **argv)
{
	int card = 0, device = 0;
	char device_name[64] = "";
	int32 exact, mute, unmute, norec, rec, left, right, flags, device_index;
	int32 left_dB, right_dB;
	int32 cur_left, cur_right, cur_flags;
	int count, quiet = 0;
	int i,add;
	int pathind = 0;
	Mixer *the_mixer;

	exact = mute = rec = norec = unmute = device_index = left = right = -1;
	left_dB = right_dB = -1;
	
	for (add = 0; add + 1 < argc; i++) {
		if (!strcmp(argv[add+1],"--help")) {
			usage();
			return 0;
		}
		if (argv[add+1][0] == '-') {
			add++;
			if (argv[add][1] == 'c') {
				card = snd_card_name(argv[++add]);
				if (card < 0) {
					fprintf(stderr, "Invalid card: %s\n",argv[2]);
					exit(1);
				}
			} else if (argv[add][1] == 'd') {
				device = atoi(argv[++add]);
				if (device < 0 || device > 128) {
					fprintf(stderr, "Invalid device: %s\n",argv[2]);
					exit(1);
				}
			} else if (argv[add][1] == 'h') {
				usage();
				return 0;
			} else if (argv[add][1] == 'p') {
				pathind = ++add;
			} else if (argv[add][1] == 'r') {
				the_mixer = new Mixer(card,device);
				if (the_mixer && the_mixer->Init()) read_config(the_mixer, pathind ? argv[pathind] : (const char *)NULL);
	    			delete the_mixer;
	    			return 0;
			} else if (argv[add][1] == 'w') {
				the_mixer = new Mixer(card,device);
				if (the_mixer && the_mixer->Init()) write_config(the_mixer);
				delete the_mixer;
				return 0;
			} else if (argv[add][1] == 'q') {
				quiet = 1;
			} else {
				fprintf(stderr, "Invalid option: %s\n", argv[add]+1);
				return 1;
			}
		} else {
			break;
		}
	}	
	for (i=1+add; i < argc; i++) {
		if (strcmp(argv[i],"exact")==0) {
			exact = 1;
		} else if (strcmp(argv[i],"mute")==0) {
			mute = 1;
		} else if (strcmp(argv[i],"unmute")==0) {
			unmute = 1;
		} else if (strcmp(argv[i],"rec")==0) {
			rec = 1;
		} else if (strcmp(argv[i],"norec")==0) {
			norec = 1;
		} else if (sscanf(argv[i], "%d:%d", &left, &right)==2) {
		} else if (sscanf(argv[i], "%d", &left)==1) {
			right = left;
		} else {
			strncpy(device_name, argv[i], sizeof(device_name));
			device_name[sizeof(device_name)-1] = 0;
		}
	}
	Mixer mixer(card,device);
	
	if (mixer.Init() == false) {
		fprintf(stderr, "Failed to open mixer device\n");
		return 1;
	}
	count = mixer.NumDevices();
	
	for (i=0; i < count; i++) {
		mixer.DeviceSet(i);
		if (strcasecmp(device_name, mixer.Name())==0) 
		  device_index = i;
	}
	if ( !quiet )
		copyright();
	if (device_index >= 0) {
		mixer.DeviceSet(device_index);
		mixer.Read(&cur_left, &cur_right, &cur_flags);
		if (left >= 0) cur_left = left;
		if (right >= 0) cur_right = right;
		if (rec == 1) cur_flags |= E_MIXER_RECORD;
		else if (norec == 1) cur_flags &= ~E_MIXER_RECORD;
		if (mute == 1) cur_flags |= E_MIXER_MUTE;	
		else if (unmute == 1) cur_flags &= ~E_MIXER_MUTE;	
		if (left != -1 || rec != -1 || norec != -1 || mute != -1 || unmute != -1) {
			mixer.Write(cur_left, cur_right, cur_flags);
		}
		if ( !quiet ) {
			printf("%-16s", mixer.Name());
			mixer.Read(&left, &right, &flags);
			mixer.Read_dB(&left_dB, &right_dB);
			printf("%-3d%% (%6.2fdB) : %-3d%% (%6.2fdB) %s %s\n\n",
				left, ((float)left_dB) / 100.0,
				right, ((float)right_dB) / 100.0,
				(flags & E_MIXER_MUTE) ? "Mute" : "    ",
				(flags & E_MIXER_RECORD) ? "Rec" : "   " );
		}
	} else {
		if (quiet) {
			usage();
			return 1;
		}
		if (strlen(device_name))
		  printf("Device not found: %s\n\n", device_name);
		for (i=0; i < count; i++) {
			mixer.DeviceSet(i);
			printf("%-16s", mixer.Name());
			mixer.Read(&left, &right, &flags);
			mixer.Read_dB(&left_dB, &right_dB);
		        printf("%-3d%% (%6.2fdB) : %-3d%% (%6.2fdB) %s %s\n",
                               left, ((float)left_dB)/100.0, right, ((float)right_dB)/100.0,
			       (flags & E_MIXER_MUTE) ? "Mute" : "    ",
			       (flags & E_MIXER_RECORD) ? "Rec" : "   ");
		}
		return 0;
	}
	
	return 0;
}