5b82ffc291
After we've been hit by Large File Support problems several times in the past week (which only occur on 32 bit platforms, which I don't have), this is yet another attempt to fix the issue.
147 lines
3.2 KiB
C
147 lines
3.2 KiB
C
/*
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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* http://www.musicpd.org
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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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "volume.h"
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#include "conf.h"
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#include "player_control.h"
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#include "idle.h"
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#include "pcm_volume.h"
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#include "output_all.h"
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#include "mixer_control.h"
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#include "mixer_all.h"
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#include "mixer_type.h"
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#include "event_pipe.h"
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#include <glib.h>
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#include <assert.h>
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#include <math.h>
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#include <string.h>
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#include <stdlib.h>
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#undef G_LOG_DOMAIN
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#define G_LOG_DOMAIN "volume"
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#define SW_VOLUME_STATE "sw_volume: "
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static unsigned volume_software_set = 100;
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/** the cached hardware mixer value; invalid if negative */
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static int last_hardware_volume = -1;
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/** the age of #last_hardware_volume */
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static GTimer *hardware_volume_timer;
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/**
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* Handler for #PIPE_EVENT_MIXER.
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*/
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static void
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mixer_event_callback(void)
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{
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/* flush the hardware volume cache */
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last_hardware_volume = -1;
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/* notify clients */
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idle_add(IDLE_MIXER);
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}
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void volume_finish(void)
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{
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g_timer_destroy(hardware_volume_timer);
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}
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void volume_init(void)
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{
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hardware_volume_timer = g_timer_new();
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event_pipe_register(PIPE_EVENT_MIXER, mixer_event_callback);
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}
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int volume_level_get(void)
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{
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assert(hardware_volume_timer != NULL);
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if (last_hardware_volume >= 0 &&
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g_timer_elapsed(hardware_volume_timer, NULL) < 1.0)
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/* throttle access to hardware mixers */
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return last_hardware_volume;
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last_hardware_volume = mixer_all_get_volume();
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g_timer_start(hardware_volume_timer);
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return last_hardware_volume;
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}
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static bool software_volume_change(unsigned volume)
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{
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assert(volume <= 100);
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volume_software_set = volume;
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mixer_all_set_software_volume(volume);
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return true;
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}
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static bool hardware_volume_change(unsigned volume)
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{
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/* reset the cache */
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last_hardware_volume = -1;
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return mixer_all_set_volume(volume);
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}
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bool volume_level_change(unsigned volume)
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{
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assert(volume <= 100);
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volume_software_set = volume;
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idle_add(IDLE_MIXER);
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return hardware_volume_change(volume);
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}
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bool
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read_sw_volume_state(const char *line)
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{
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char *end = NULL;
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long int sv;
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if (!g_str_has_prefix(line, SW_VOLUME_STATE))
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return false;
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line += sizeof(SW_VOLUME_STATE) - 1;
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sv = strtol(line, &end, 10);
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if (*end == 0 && sv >= 0 && sv <= 100)
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software_volume_change(sv);
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else
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g_warning("Can't parse software volume: %s\n", line);
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return true;
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}
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void save_sw_volume_state(FILE *fp)
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{
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fprintf(fp, SW_VOLUME_STATE "%u\n", volume_software_set);
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}
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unsigned
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sw_volume_state_get_hash(void)
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{
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return volume_software_set;
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}
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