[pulseaudio-discuss] [PATCH 2/2] module-ducking: Applying the ducking effect for specified streams

Flavio Ceolin flavio.ceolin at profusion.mobi
Thu Aug 9 11:50:28 PDT 2012


This module works pretty similar to the module-role-cork.
It should be used as an alternative to that module. Basically
it decreases the volume of the streams specified in ducking_roles
in the presence of at least one stream specified in trigger_roles.
Also, it's possible to choice the volume that will be used in the
ducking streams and if it should operates in all devices or not.

For basic reference: http://en.wikipedia.org/wiki/Ducking
---
 src/Makefile.am                   |  10 +-
 src/modules/module-role-ducking.c | 330 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 339 insertions(+), 1 deletion(-)
 create mode 100644 src/modules/module-role-ducking.c

diff --git a/src/Makefile.am b/src/Makefile.am
index 7f947bd..1bff86d 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1039,7 +1039,8 @@ modlibexec_LTLIBRARIES += \
 		module-switch-on-connect.la \
 		module-switch-on-port-available.la \
 		module-filter-apply.la \
-		module-filter-heuristics.la
+		module-filter-heuristics.la \
+		module-role-ducking.la
 
 if HAVE_ESOUND
 modlibexec_LTLIBRARIES += \
@@ -1349,6 +1350,7 @@ SYMDEF_FILES = \
 		module-raop-discover-symdef.h \
 		module-gconf-symdef.h \
 		module-position-event-sounds-symdef.h \
+		module-role-ducking-symdef.h \
 		module-augment-properties-symdef.h \
 		module-role-cork-symdef.h \
 		module-console-kit-symdef.h \
@@ -1746,6 +1748,12 @@ module_position_event_sounds_la_LDFLAGS = $(MODULE_LDFLAGS)
 module_position_event_sounds_la_LIBADD = $(MODULE_LIBADD)
 module_position_event_sounds_la_CFLAGS = $(AM_CFLAGS)
 
+# Ducking effect in presence of a DUCKING stream
+module_role_ducking_la_SOURCES = modules/module-role-ducking.c
+module_role_ducking_la_LDFLAGS = $(MODULE_LDFLAGS)
+module_role_ducking_la_LIBADD = $(MODULE_LIBADD)
+module_role_ducking_la_CFLAGS = $(AM_CFLAGS)
+
 # Augment properties from XDG .desktop files
 module_augment_properties_la_SOURCES = modules/module-augment-properties.c
 module_augment_properties_la_LDFLAGS = $(MODULE_LDFLAGS)
diff --git a/src/modules/module-role-ducking.c b/src/modules/module-role-ducking.c
new file mode 100644
index 0000000..428dc37
--- /dev/null
+++ b/src/modules/module-role-ducking.c
@@ -0,0 +1,330 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2012 Flavio Ceolin <flavio.ceolin at profusion.mobi>
+
+  PulseAudio 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 2.1 of the License,
+  or (at your option) any later version.
+
+  PulseAudio 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 PulseAudio; 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 <pulse/volume.h>
+#include <pulse/xmalloc.h>
+
+#include <pulsecore/macro.h>
+#include <pulsecore/hashmap.h>
+#include <pulsecore/hook-list.h>
+#include <pulsecore/core.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/sink-input.h>
+#include <pulsecore/modargs.h>
+
+#include "module-role-ducking-symdef.h"
+
+
+PA_MODULE_AUTHOR("Flavio Ceolin <flavio.ceolin at profusion.mobi>");
+PA_MODULE_DESCRIPTION("Apply ducking effect on streams with certain roles while others exist");
+PA_MODULE_VERSION(PACKAGE_VERSION);
+PA_MODULE_LOAD_ONCE(TRUE);
+PA_MODULE_USAGE(
+        "trigger_roles=<Comma separated list of roles which will trigger a ducking> "
+        "ducking_roles=<Comma separated list of roles which will be duckinged> "
+        "global=<Should we operate globally or only inside the same device?>"
+        "volume=<linear factor for the volume. 0.0 and less is muted while 1.0 is PA_VOLUME_NORM>");
+
+static const char* const valid_modargs[] = {
+    "trigger_roles",
+    "ducking_roles",
+    "global",
+    "volume",
+    NULL
+};
+
+struct userdata {
+    pa_core *core;
+    pa_hashmap *ducking_state;
+    pa_idxset *trigger_roles;
+    pa_idxset *ducking_roles;
+    pa_bool_t global:1;
+    pa_volume_t volume;
+    pa_hook_slot
+        *sink_input_put_slot,
+        *sink_input_unlink_slot,
+        *sink_input_move_start_slot,
+        *sink_input_move_finish_slot;
+};
+
+static pa_bool_t shall_ducking(struct userdata *u, pa_sink *s, pa_sink_input *ignore) {
+    pa_sink_input *j;
+    uint32_t idx, role_idx;
+    const char *trigger_role;
+
+    pa_assert(u);
+    pa_sink_assert_ref(s);
+
+    for (j = PA_SINK_INPUT(pa_idxset_first(s->inputs, &idx)); j; j = PA_SINK_INPUT(pa_idxset_next(s->inputs, &idx))) {
+        const char *role;
+
+        if (j == ignore)
+            continue;
+
+        if (!(role = pa_proplist_gets(j->proplist, PA_PROP_MEDIA_ROLE)))
+            continue;
+
+        PA_IDXSET_FOREACH(trigger_role, u->trigger_roles, role_idx) {
+            if (pa_streq(role, trigger_role)) {
+                pa_log_debug("Found a '%s' stream that will trigger the ducking.", trigger_role);
+                return TRUE;
+            }
+        }
+    }
+
+    return FALSE;
+}
+
+static inline void apply_ducking_to_sink(struct userdata *u, pa_sink *s, pa_sink_input *ignore, pa_bool_t ducking) {
+    pa_sink_input *j;
+    uint32_t idx, role_idx;
+    const char *ducking_role;
+    pa_bool_t trigger = FALSE;
+    pa_cvolume *v;
+
+    pa_assert(u);
+    pa_sink_assert_ref(s);
+
+    for (j = PA_SINK_INPUT(pa_idxset_first(s->inputs, &idx)); j; j = PA_SINK_INPUT(pa_idxset_next(s->inputs, &idx))) {
+        const char *role;
+
+        if (j == ignore)
+            continue;
+
+        if (!(role = pa_proplist_gets(j->proplist, PA_PROP_MEDIA_ROLE)))
+            continue;
+
+        PA_IDXSET_FOREACH(ducking_role, u->ducking_roles, role_idx) {
+            if ((trigger = pa_streq(role, ducking_role)))
+                break;
+        }
+        if (!trigger)
+            continue;
+
+        if (ducking) {
+            pa_cvolume aux;
+            v = pa_hashmap_get(u->ducking_state, j);
+
+            pa_log_debug("Found a '%s' stream that should be duckinged.", ducking_role);
+            if (!v) {
+                v = pa_xmalloc(sizeof (pa_cvolume));
+                pa_hashmap_put(u->ducking_state, j, pa_sink_input_get_volume(j, v, FALSE));
+            }
+
+            aux = *v;
+            pa_cvolume_set(&aux, aux.channels, u->volume);
+            pa_sink_input_set_volume(j, &aux, FALSE, FALSE);
+        } else {
+            v = pa_hashmap_remove(u->ducking_state, j);
+            if (v) {
+                pa_log_debug("Found a '%s' stream that should be unduckinged.", ducking_role);
+                pa_sink_input_set_volume(j, v, FALSE, FALSE);
+                pa_xfree(v);
+            }
+        }
+    }
+}
+
+static void apply_ducking(struct userdata *u, pa_sink *s, pa_sink_input *ignore, pa_bool_t ducking) {
+    pa_assert(u);
+
+    if (u->global) {
+        uint32_t idx;
+        PA_IDXSET_FOREACH(s, u->core->sinks, idx)
+            apply_ducking_to_sink(u, s, ignore, ducking);
+    } else
+        apply_ducking_to_sink(u, s, ignore, ducking);
+}
+
+static pa_hook_result_t process(struct userdata *u, pa_sink_input *i, pa_bool_t create) {
+    pa_bool_t ducking = FALSE;
+    const char *role;
+    pa_cvolume *v;
+
+    pa_assert(u);
+    pa_sink_input_assert_ref(i);
+
+    if (!create) {
+        v = pa_hashmap_remove(u->ducking_state, i);
+        pa_xfree(v);
+    }
+
+    if (!(role = pa_proplist_gets(i->proplist, PA_PROP_MEDIA_ROLE)))
+        return PA_HOOK_OK;
+
+    if (!i->sink)
+        return PA_HOOK_OK;
+
+    ducking = shall_ducking(u, i->sink, create ? NULL : i);
+    apply_ducking(u, i->sink, create ? NULL : i, ducking);
+
+    return PA_HOOK_OK;
+}
+
+static pa_hook_result_t sink_input_put_cb(pa_core *core, pa_sink_input *i, struct userdata *u) {
+    pa_core_assert_ref(core);
+    pa_sink_input_assert_ref(i);
+
+    return process(u, i, TRUE);
+}
+
+static pa_hook_result_t sink_input_unlink_cb(pa_core *core, pa_sink_input *i, struct userdata *u) {
+    pa_sink_input_assert_ref(i);
+
+    return process(u, i, FALSE);
+}
+
+static pa_hook_result_t sink_input_move_start_cb(pa_core *core, pa_sink_input *i, struct userdata *u) {
+    pa_core_assert_ref(core);
+    pa_sink_input_assert_ref(i);
+
+    return process(u, i, FALSE);
+}
+
+static pa_hook_result_t sink_input_move_finish_cb(pa_core *core, pa_sink_input *i, struct userdata *u) {
+    pa_core_assert_ref(core);
+    pa_sink_input_assert_ref(i);
+
+    return process(u, i, TRUE);
+}
+
+int pa__init(pa_module *m) {
+    pa_modargs *ma = NULL;
+    struct userdata *u;
+    const char *roles;
+    pa_bool_t global = FALSE;
+    double volume = 0.15;
+
+    pa_assert(m);
+
+    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+        pa_log("Failed to parse module arguments");
+        goto fail;
+    }
+
+    m->userdata = u = pa_xnew(struct userdata, 1);
+
+    u->core = m->core;
+    u->ducking_state = pa_hashmap_new(pa_idxset_trivial_hash_func, pa_idxset_trivial_compare_func);
+
+    u->trigger_roles = pa_idxset_new(NULL, NULL);
+    roles = pa_modargs_get_value(ma, "trigger_roles", NULL);
+    if (roles) {
+        const char *split_state = NULL;
+        char *n = NULL;
+        while ((n = pa_split(roles, ",", &split_state))) {
+            if (n[0] != '\0')
+                pa_idxset_put(u->trigger_roles, n, NULL);
+            else
+                pa_xfree(n);
+        }
+    }
+    if (pa_idxset_isempty(u->trigger_roles)) {
+        pa_log_debug("Using role 'phone' as trigger role.");
+        pa_idxset_put(u->trigger_roles, pa_xstrdup("phone"), NULL);
+    }
+
+    u->ducking_roles = pa_idxset_new(NULL, NULL);
+    roles = pa_modargs_get_value(ma, "ducking_roles", NULL);
+    if (roles) {
+        const char *split_state = NULL;
+        char *n = NULL;
+        while ((n = pa_split(roles, ",", &split_state))) {
+            if (n[0] != '\0')
+                pa_idxset_put(u->ducking_roles, n, NULL);
+            else
+                pa_xfree(n);
+        }
+    }
+    if (pa_idxset_isempty(u->ducking_roles)) {
+        pa_log_debug("Using roles 'music' and 'video' as ducking roles.");
+        pa_idxset_put(u->ducking_roles, pa_xstrdup("music"), NULL);
+        pa_idxset_put(u->ducking_roles, pa_xstrdup("video"), NULL);
+    }
+
+    if (pa_modargs_get_value_boolean(ma, "global", &global) < 0) {
+        pa_log("Invalid boolean parameter: global");
+        goto fail;
+    }
+    u->global = global;
+
+    if (pa_modargs_get_value_double(ma, "volume", &volume) < 0) {
+        pa_log("Invalid unsigned integer parameter: volume");
+        goto fail;
+    }
+    u->volume = pa_sw_volume_from_linear(volume);
+
+    u->sink_input_put_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_INPUT_PUT], PA_HOOK_LATE, (pa_hook_cb_t) sink_input_put_cb, u);
+    u->sink_input_unlink_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_INPUT_UNLINK], PA_HOOK_LATE, (pa_hook_cb_t) sink_input_unlink_cb, u);
+    u->sink_input_move_start_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_INPUT_MOVE_START], PA_HOOK_LATE, (pa_hook_cb_t) sink_input_move_start_cb, u);
+    u->sink_input_move_finish_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_INPUT_MOVE_FINISH], PA_HOOK_LATE, (pa_hook_cb_t) sink_input_move_finish_cb, u);
+
+    pa_modargs_free(ma);
+
+    return 0;
+
+fail:
+    pa__done(m);
+
+    if (ma)
+        pa_modargs_free(ma);
+
+    return -1;
+}
+
+void pa__done(pa_module *m) {
+    struct userdata* u;
+    char *role;
+
+    pa_assert(m);
+
+    if (!(u = m->userdata))
+        return;
+
+    if (u->trigger_roles) {
+        while ((role = pa_idxset_steal_first(u->trigger_roles, NULL)))
+            pa_xfree(role);
+        pa_idxset_free(u->trigger_roles, NULL, NULL);
+    }
+    if (u->ducking_roles) {
+        while ((role = pa_idxset_steal_first(u->ducking_roles, NULL)))
+            pa_xfree(role);
+        pa_idxset_free(u->ducking_roles, NULL, NULL);
+    }
+
+    if (u->sink_input_put_slot)
+        pa_hook_slot_free(u->sink_input_put_slot);
+    if (u->sink_input_unlink_slot)
+        pa_hook_slot_free(u->sink_input_unlink_slot);
+    if (u->sink_input_move_start_slot)
+        pa_hook_slot_free(u->sink_input_move_start_slot);
+    if (u->sink_input_move_finish_slot)
+        pa_hook_slot_free(u->sink_input_move_finish_slot);
+
+    if (u->ducking_state)
+        pa_hashmap_free(u->ducking_state, NULL, NULL);
+
+    pa_xfree(u);
+}
-- 
1.7.11.2



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