add new module module-volume-restore which saves and restores volume of playback streams

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@859 fefdeb5f-60dc-0310-8127-8f9354f1896f

1 files changed, 361 insertions, 0 deletions

diff --git a/src/modules/module-volume-restore.c b/src/modules/module-volume-restore.c
new file mode 100644
index 00000000..c32bb3a9
--- /dev/null
+++ b/src/modules/module-volume-restore.c
@@ -0,0 +1,361 @@
+/* $Id$ */
+
+/***
+  This file is part of polypaudio.
+ 
+  polypaudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+ 
+  polypaudio 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 Lesser General Public License
+  along with polypaudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <unistd.h>
+#include <assert.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <regex.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+#include <polypcore/module.h>
+#include <polypcore/util.h>
+#include <polypcore/modargs.h>
+#include <polypcore/log.h>
+#include <polypcore/core-subscribe.h>
+#include <polypcore/xmalloc.h>
+#include <polypcore/sink-input.h>
+#include <polyp/volume.h>
+
+#include "module-volume-restore-symdef.h"
+
+PA_MODULE_AUTHOR("Lennart Poettering")
+PA_MODULE_DESCRIPTION("Playback stream automatic volume restore module")
+PA_MODULE_USAGE("table=<filename>")
+PA_MODULE_VERSION(PACKAGE_VERSION)
+
+#define WHITESPACE "\n\r \t"
+
+#define DEFAULT_VOLUME_TABLE_FILE ".polypaudio/volume.table"
+
+static const char* const valid_modargs[] = {
+    "table",
+    NULL,
+};
+
+struct rule {
+    char* name;
+    pa_cvolume volume;
+};
+
+struct userdata {
+    pa_hashmap *hashmap;
+    pa_subscription *subscription;
+    int modified;
+    char *table_file;
+};
+
+static pa_cvolume* parse_volume(const char *s, pa_cvolume *v) {
+    char *p;
+    long k;
+    unsigned i;
+    
+    assert(s);
+    assert(v);
+
+    if (!isdigit(*s))
+        return NULL;
+
+    k = strtol(s, &p, 0);
+    if (k <= 0 || k > PA_CHANNELS_MAX)
+        return NULL;
+    
+    v->channels = (unsigned) k;
+
+    for (i = 0; i < v->channels; i++) {
+        p += strspn(p, WHITESPACE);
+
+        if (!isdigit(*p))
+            return NULL;
+
+        k = strtol(p, &p, 0);
+
+        if (k < PA_VOLUME_MUTED)
+            return NULL;
+        
+        v->values[i] = (pa_volume_t) k;
+    }
+
+    if (*p != 0)
+        return NULL;
+
+    return v;
+}
+
+static int load_rules(struct userdata *u) {
+    FILE *f;
+    int n = 0;
+    int ret = -1;
+    char buf_name[256], buf_volume[256];
+    char *ln = buf_name;
+
+    f = u->table_file ?
+        fopen(u->table_file, "r") :
+        pa_open_config_file(NULL, DEFAULT_VOLUME_TABLE_FILE, NULL, &u->table_file, "r");
+    
+    if (!f) {
+        if (errno == ENOENT) {
+            pa_log(__FILE__": starting with empty ruleset.");
+            ret = 0;
+        } else
+            pa_log(__FILE__": failed to open file '%s': %s", u->table_file, strerror(errno));
+        
+        goto finish;
+    }
+
+    while (!feof(f)) {
+        struct rule *rule;
+        pa_cvolume v;
+        
+        if (!fgets(ln, sizeof(buf_name), f))
+            break;
+
+        n++;
+        
+        pa_strip_nl(ln);
+
+        if (ln[0] == '#' || !*ln )
+            continue;
+
+        if (ln == buf_name) {
+            ln = buf_volume;
+            continue;
+        }
+
+        assert(ln == buf_volume);
+
+        if (!parse_volume(buf_volume, &v)) {
+            pa_log(__FILE__": parse failure in %s:%u, stopping parsing", u->table_file, n);
+            goto finish;
+        }
+
+        ln = buf_name;
+        
+        if (pa_hashmap_get(u->hashmap, buf_name)) {
+            pa_log(__FILE__": double entry in %s:%u, ignoring", u->table_file, n);
+            goto finish;
+        }
+        
+        rule = pa_xnew(struct rule, 1);
+        rule->name = pa_xstrdup(buf_name);
+        rule->volume = v;
+
+        pa_hashmap_put(u->hashmap, rule->name, rule);
+    }
+
+    if (ln == buf_volume) {
+        pa_log(__FILE__": invalid number of lines in %s.", u->table_file);
+        goto finish;
+    }
+
+    ret = 0;
+    
+finish:
+    if (f)
+        fclose(f);
+
+    return ret;
+}
+
+static int save_rules(struct userdata *u) {
+    FILE *f;
+    int ret = -1;
+    void *state = NULL;
+    struct rule *rule;
+    
+    f = u->table_file ?
+        fopen(u->table_file, "w") :
+        pa_open_config_file(NULL, DEFAULT_VOLUME_TABLE_FILE, NULL, &u->table_file, "w");
+
+    if (!f) {
+        pa_log(__FILE__": failed to open file '%s': %s", u->table_file, strerror(errno));
+        goto finish;
+    }
+
+    while ((rule = pa_hashmap_iterate(u->hashmap, &state, NULL))) {
+        unsigned i;
+        
+        fprintf(f, "%s\n%u", rule->name, rule->volume.channels);
+        
+        for (i = 0; i < rule->volume.channels; i++)
+            fprintf(f, " %u", rule->volume.values[i]);
+
+
+        fprintf(f, "\n");
+    }
+    
+    ret = 0;
+    
+finish:
+    if (f)
+        fclose(f);
+
+    return ret;
+}
+
+static char* client_name(pa_client *c) {
+    char *t, *e;
+    
+    if (!c->name || !c->driver)
+        return NULL;
+
+    t = pa_sprintf_malloc("%s$%s", c->driver, c->name);
+    t[strcspn(t, "\n\r#")] = 0;
+
+    if (!*t)
+        return NULL;
+
+    if ((e = strrchr(t, '('))) {
+        char *k = e + 1 + strspn(e + 1, "0123456789-");
+
+        /* Dirty trick: truncate all trailing parens with numbers in
+         * between, since they are usually used to identify multiple
+         * sessions of the same application, which is something we
+         * explicitly don't want. Besides other stuff this makes xmms
+         * with esound work properly for us. */
+        
+        if (*k == ')' && *(k+1) == 0)
+            *e = 0;
+    }
+    
+    return t;
+}
+
+static void callback(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
+    struct userdata *u =  userdata;
+    pa_sink_input *si;
+    struct rule *r;
+    char *name;
+    
+    assert(c);
+    assert(u);
+
+    if (t != (PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_NEW) &&
+        t != (PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE))
+        return;
+        
+    if (!(si = pa_idxset_get_by_index(c->sink_inputs, idx)))
+        return;
+    
+    if (!si->client || !(name = client_name(si->client)))
+        return;
+
+    if ((r = pa_hashmap_get(u->hashmap, name))) {
+        pa_xfree(name);
+
+        if (((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) == PA_SUBSCRIPTION_EVENT_NEW) && si->sample_spec.channels == r->volume.channels) {
+            pa_log_info(__FILE__": Restoring volume for <%s>", r->name);
+            pa_sink_input_set_volume(si, &r->volume);
+        } else if (!pa_cvolume_equal(pa_sink_input_get_volume(si), &r->volume)) {
+            pa_log_info(__FILE__": Saving volume for <%s>", r->name);
+            r->volume = *pa_sink_input_get_volume(si);
+            u->modified = 1;
+        }
+        
+    } else {
+        pa_log_info(__FILE__": Creating new entry for <%s>", name);
+
+        r = pa_xnew(struct rule, 1);
+        r->name = name;
+        r->volume = *pa_sink_input_get_volume(si);
+        pa_hashmap_put(u->hashmap, r->name, r);
+
+        u->modified = 1;
+    }
+}
+
+int pa__init(pa_core *c, pa_module*m) {
+    pa_modargs *ma = NULL;
+    struct userdata *u;
+    
+    assert(c);
+    assert(m);
+
+    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+        pa_log(__FILE__": Failed to parse module arguments");
+        goto fail;
+    }
+
+    u = pa_xnew(struct userdata, 1);
+    u->hashmap = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
+    u->subscription = NULL;
+    u->table_file = pa_xstrdup(pa_modargs_get_value(ma, "table", NULL));
+    u->modified = 0;
+    
+    m->userdata = u;
+    
+    if (load_rules(u) < 0)
+        goto fail;
+
+    u->subscription = pa_subscription_new(c, PA_SUBSCRIPTION_MASK_SINK_INPUT, callback, u);
+
+    pa_modargs_free(ma);
+    return 0;
+
+fail:
+    pa__done(c, m);
+
+    if (ma)
+        pa_modargs_free(ma);
+    
+    return  -1;
+}
+
+static void free_func(void *p, void *userdata) {
+    struct rule *r = p;
+    assert(r);
+
+    pa_xfree(r->name);
+    pa_xfree(r);
+}
+
+void pa__done(pa_core *c, pa_module*m) {
+    struct userdata* u;
+    
+    assert(c);
+    assert(m);
+
+    if (!(u = m->userdata))
+        return;
+
+    if (u->subscription)
+        pa_subscription_free(u->subscription);
+
+    if (u->hashmap) {
+
+        if (u->modified)
+            save_rules(u);
+        
+        pa_hashmap_free(u->hashmap, free_func, NULL);
+    }
+
+    pa_xfree(u->table_file);
+    pa_xfree(u);
+}
+
+