aboutsummaryrefslogtreecommitdiffstats
path: root/src/volume.c
blob: e7fa20a629f6489a1c231d5a1519e42ac44a8905 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
/*
 * Copyright (C) 2003-2009 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "volume.h"
#include "conf.h"
#include "player_control.h"
#include "idle.h"
#include "pcm_volume.h"
#include "config.h"
#include "output_all.h"
#include "mixer_control.h"
#include "mixer_all.h"

#include <glib.h>

#include <assert.h>
#include <math.h>
#include <string.h>
#include <stdlib.h>

#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "volume"

#define SW_VOLUME_STATE                         "sw_volume: "

static enum {
	VOLUME_MIXER_TYPE_SOFTWARE,
	VOLUME_MIXER_TYPE_HARDWARE,
	VOLUME_MIXER_TYPE_DISABLED,
} volume_mixer_type = VOLUME_MIXER_TYPE_HARDWARE;

static int volume_software_set = 100;

/** the cached hardware mixer value; invalid if negative */
static int last_hardware_volume = -1;
/** the age of #last_hardware_volume */
static GTimer *hardware_volume_timer;

void volume_finish(void)
{
	if (volume_mixer_type == VOLUME_MIXER_TYPE_HARDWARE)
		g_timer_destroy(hardware_volume_timer);
}

/**
 * Finds the first audio_output configuration section with the
 * specified type.
 */
static struct config_param *
find_output_config(const char *type)
{
	struct config_param *param = NULL;

	while ((param = config_get_next_param(CONF_AUDIO_OUTPUT,
					      param)) != NULL) {
		const char *param_type =
			config_get_block_string(param, "type", NULL);
		if (param_type != NULL && strcmp(param_type, type) == 0)
			return param;
	}

	return NULL;
}

/**
 * Copy a (top-level) legacy mixer configuration parameter to the
 * audio_output section.
 */
static void
mixer_copy_legacy_param(const char *type, const char *name)
{
	const struct config_param *param;
	struct config_param *output;
	const struct block_param *bp;

	/* see if the deprecated configuration exists */

	param = config_get_param(name);
	if (param == NULL)
		return;

	g_warning("deprecated option '%s' found, moving to '%s' audio output",
		  name, type);

	/* determine the configuration section */

	output = find_output_config(type);
	if (output == NULL) {
		/* if there is no output configuration at all, create
		   a new and empty configuration section for the
		   legacy mixer */

		if (config_get_next_param(CONF_AUDIO_OUTPUT, NULL) != NULL)
			/* there is an audio_output configuration, but
			   it does not match the mixer_type setting */
			g_error("no '%s' audio output found", type);

		output = config_new_param(NULL, param->line);
		config_add_block_param(output, "type", type, param->line);
		config_add_block_param(output, "name", type, param->line);
		config_add_param(CONF_AUDIO_OUTPUT, output);
	}

	bp = config_get_block_param(output, name);
	if (bp != NULL)
		g_error("the '%s' audio output already has a '%s' setting",
			type, name);

	/* duplicate the parameter in the configuration section */

	config_add_block_param(output, name, param->value, param->line);
}

static void
mixer_reconfigure(const char *type)
{
	mixer_copy_legacy_param(type, CONF_MIXER_DEVICE);
	mixer_copy_legacy_param(type, CONF_MIXER_CONTROL);
}

void volume_init(void)
{
	const struct config_param *param = config_get_param(CONF_MIXER_TYPE);
	//hw mixing is by default
	if (param) {
		if (strcmp(param->value, VOLUME_MIXER_SOFTWARE) == 0) {
			volume_mixer_type = VOLUME_MIXER_TYPE_SOFTWARE;
			mixer_disable_all();
		} else if (strcmp(param->value, VOLUME_MIXER_DISABLED) == 0) {
			volume_mixer_type = VOLUME_MIXER_TYPE_DISABLED;
			mixer_disable_all();
		} else if (strcmp(param->value, VOLUME_MIXER_HARDWARE) == 0) {
			//nothing to do
		} else {
			//fallback to old config behaviour
			if (strcmp(param->value, VOLUME_MIXER_OSS) == 0) {
				mixer_reconfigure(param->value);
			} else if (strcmp(param->value, VOLUME_MIXER_ALSA) == 0) {
				mixer_reconfigure(param->value);
			} else {
				g_error("unknown mixer type %s at line %i\n",
					param->value, param->line);
			}
		}
	}

	if (volume_mixer_type == VOLUME_MIXER_TYPE_HARDWARE)
		hardware_volume_timer = g_timer_new();
}

static int hardware_volume_get(void)
{
	assert(hardware_volume_timer != NULL);

	if (last_hardware_volume >= 0 &&
	    g_timer_elapsed(hardware_volume_timer, NULL) < 1.0)
		/* throttle access to hardware mixers */
		return last_hardware_volume;

	last_hardware_volume = mixer_all_get_volume();
	g_timer_start(hardware_volume_timer);
	return last_hardware_volume;
}

static int software_volume_get(void)
{
	return volume_software_set;
}

int volume_level_get(void)
{
	switch (volume_mixer_type) {
	case VOLUME_MIXER_TYPE_SOFTWARE:
		return software_volume_get();
	case VOLUME_MIXER_TYPE_HARDWARE:
		return hardware_volume_get();
	case VOLUME_MIXER_TYPE_DISABLED:
		return -1;
	}

	/* unreachable */
	assert(false);
	return -1;
}

static bool software_volume_change(int change, bool rel)
{
	int new = change;

	if (rel)
		new += volume_software_set;

	if (new > 100)
		new = 100;
	else if (new < 0)
		new = 0;

	volume_software_set = new;

	/*new = 100.0*(exp(new/50.0)-1)/(M_E*M_E-1)+0.5; */
	if (new >= 100)
		new = PCM_VOLUME_1;
	else if (new <= 0)
		new = 0;
	else
		new = pcm_float_to_volume((exp(new / 25.0) - 1) /
					  (54.5981500331F - 1));

	setPlayerSoftwareVolume(new);

	return true;
}

static bool hardware_volume_change(int change, bool rel)
{
	/* reset the cache */
	last_hardware_volume = -1;

	return mixer_all_set_volume(change, rel);
}

bool volume_level_change(int change, bool rel)
{
	idle_add(IDLE_MIXER);

	switch (volume_mixer_type) {
	case VOLUME_MIXER_TYPE_HARDWARE:
		return hardware_volume_change(change, rel);
	case VOLUME_MIXER_TYPE_SOFTWARE:
		return software_volume_change(change, rel);
	default:
		return true;
	}
}

void read_sw_volume_state(FILE *fp)
{
	char buf[sizeof(SW_VOLUME_STATE) + sizeof("100") - 1];
	char *end = NULL;
	long int sv;

	if (volume_mixer_type != VOLUME_MIXER_TYPE_SOFTWARE)
		return;
	while (fgets(buf, sizeof(buf), fp)) {
		if (!g_str_has_prefix(buf, SW_VOLUME_STATE))
			continue;

		g_strchomp(buf);
		sv = strtol(buf + strlen(SW_VOLUME_STATE), &end, 10);
		if (G_LIKELY(!*end))
			software_volume_change(sv, 0);
		else
			g_warning("Can't parse software volume: %s\n", buf);
		return;
	}
}

void save_sw_volume_state(FILE *fp)
{
	if (volume_mixer_type == VOLUME_MIXER_TYPE_SOFTWARE)
		fprintf(fp, SW_VOLUME_STATE "%d\n", volume_software_set);
}