Hi there,
A while ago we (Collabora) implemented a module for Valve changing the
default policy regarding passthrough streams.
You can find some context on the original thread: http://lists.freedesk
top.org/archives/pulseaudio-discuss/2014-May/020644.html
This module never reached upstream but is still shipped and used by
default on SteamOS.
I'd be interested resurrecting this work and bring it to a state it
could be merged upstream.
What would be needed to reach this? Would fixing Arun's comments from h
ttp://lists.freedesktop.org/archives/pulseaudio-discuss/2014
-May/020745.html be enough?
Thanks for your input,
G./***
This file is part of PulseAudio.
Copyright (C) 2014 Collabora Ltd. <http://www.collabora.co.uk/>
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/xmalloc.h>
#include <pulsecore/core.h>
#include <pulsecore/i18n.h>
#include <pulsecore/sink-input.h>
#include <pulsecore/source-output.h>
#include <pulsecore/modargs.h>
#include <pulsecore/log.h>
#include <pulsecore/namereg.h>
#include <pulsecore/core-util.h>
#include "module-allow-passthrough-symdef.h"
PA_MODULE_AUTHOR("Guillaume Desmottes");
PA_MODULE_DESCRIPTION("When a passthrough stream is requested, route all the other streams to a dummy device");
PA_MODULE_VERSION(PACKAGE_VERSION);
PA_MODULE_LOAD_ONCE(true);
static const char* const valid_modargs[] = {
NULL,
};
struct userdata {
/* (pa_sink *) -> (pa_sink *)
* Map the 'real' muted sink to the null-sink currently being used to play
* its streams. */
pa_hashmap *null_sinks;
pa_hook_slot
*sink_input_new_slot,
*sink_input_unlink_slot;
};
static pa_sink *ensure_null_sink_for_sink(struct userdata *u, pa_sink *s, pa_core *c) {
char *t;
pa_module *m;
pa_sink *sink;
uint32_t idx;
sink = pa_hashmap_get(u->null_sinks, s);
if (sink != NULL)
/* We already have a null-sink for this sink */
return sink;
t = pa_sprintf_malloc("sink_name=allow_passthrough_null sink_properties='device.description=\"%s\"'",
_("Dummy Output"));
m = pa_module_load(c, "module-null-sink", t);
pa_xfree(t);
if (m == NULL)
return NULL;
PA_IDXSET_FOREACH(sink, c->sinks, idx) {
if (sink->module->index == m->index) {
pa_hashmap_put(u->null_sinks, s, sink);
return sink;
}
}
return NULL;
}
static void unload_null_sink_module_for_sink(struct userdata *u, pa_sink *s, pa_core *c) {
pa_sink *null_sink;
null_sink = pa_hashmap_get(u->null_sinks, s);
if (null_sink == NULL)
return;
pa_module_unload_request_by_index(c, null_sink->module->index, true);
pa_hashmap_remove(u->null_sinks, s);
}
static void move_stream(pa_sink_input *i, pa_sink *target) {
if (pa_sink_input_move_to(i, target, false) < 0)
pa_log_info("Failed to move sink input %u \"%s\" to %s.", i->index,
pa_strnull(pa_proplist_gets(i->proplist, PA_PROP_APPLICATION_NAME)), target->name);
else
pa_log_info("Successfully moved sink input %u \"%s\" to %s.", i->index,
pa_strnull(pa_proplist_gets(i->proplist, PA_PROP_APPLICATION_NAME)), target->name);
}
/* FIXME: remove this hack */
static bool stream_is_fake_passthrough(pa_proplist *proplist) {
const char *role = NULL;
role = pa_proplist_gets(proplist, PA_PROP_MEDIA_ROLE);
return (role != NULL && strcmp(role, "fake-passthrough") == 0);
}
static bool sink_has_passthrough_stream(pa_sink *sink)
{
/* FIXME: use pa_sink_is_passthrough() once we get rid of the
* "fake-passthrough" hack. */
pa_sink_input *stream;
uint32_t idx;
PA_IDXSET_FOREACH(stream, sink->inputs, idx) {
if (stream_is_fake_passthrough (stream->proplist) ||
pa_sink_input_is_passthrough (stream))
return true;
}
return false;
}
static pa_hook_result_t new_passthrough_stream(struct userdata *u, pa_core *c, pa_sink_input_new_data *new_data) {
uint32_t idx;
pa_sink_input *stream;
pa_sink *null_sink;
if (sink_has_passthrough_stream(new_data->sink)) {
pa_log_info("Dropping playing a passthrough stream; ignoring");
if (stream_is_fake_passthrough(new_data->proplist))
return PA_HOOK_CANCEL;
else
/* Pulseaudio will reject the stream itself */
return PA_HOOK_OK;
}
pa_log_info("Just received a passthrough stream; pause all the others streams so it can play");
null_sink = ensure_null_sink_for_sink(u, new_data->sink, c);
if (null_sink == NULL)
return PA_HOOK_OK;
PA_IDXSET_FOREACH(stream, new_data->sink->inputs, idx) {
move_stream(stream, null_sink);
}
return PA_HOOK_OK;
}
static pa_hook_result_t new_normal_stream(struct userdata *u, pa_core *c, pa_sink_input_new_data *new_data) {
pa_sink *null_sink;
if (!sink_has_passthrough_stream(new_data->sink))
return PA_HOOK_OK;
null_sink = ensure_null_sink_for_sink(u, new_data->sink, c);
if (null_sink == NULL)
return PA_HOOK_OK;
pa_log_info("Already playing a passthrough stream; re-routing new stream to the null sink");
pa_sink_input_new_data_set_sink(new_data, null_sink, false);
return PA_HOOK_OK;
}
static pa_hook_result_t sink_input_new_cb(pa_core *core, pa_sink_input_new_data *new_data, struct userdata *u) {
pa_core_assert_ref(core);
/* This is a bit of a hack, to determine whether the input stream will use
* a passthrough stream, the sink should have been selected and a format
* renegotiated. This can either happen by an earlier module (e.g. one
* doing routing or other policies) and if not pulseaudio core will setup
* the defaults after all hooks for this event have been processed.
*
* Unfortunately if no other module decides on sink/format before this hook
* runs, pulse core doing it is too late, so if a sink and/or stream format
* haven't been setup & configured just yet do so now using the same code
* as pulsecore would use (default sink and higher priority negotiated
* format).
*/
if (!new_data->sink) {
pa_sink *sink = pa_namereg_get(core, NULL, PA_NAMEREG_SINK);
pa_return_val_if_fail(sink, -PA_ERR_NOENTITY);
pa_sink_input_new_data_set_sink(new_data, sink, false);
}
if (!new_data->format && new_data->nego_formats && !pa_idxset_isempty(new_data->nego_formats))
new_data->format = pa_format_info_copy(pa_idxset_first(new_data->nego_formats, NULL));
if (stream_is_fake_passthrough (new_data->proplist) ||
pa_sink_input_new_data_is_passthrough(new_data))
return new_passthrough_stream(u, core, new_data);
return new_normal_stream(u, core, new_data);
}
static pa_hook_result_t passthrough_stream_removed(struct userdata *u, pa_core *c, pa_sink_input *i) {
uint32_t idx;
pa_sink_input *stream;
pa_sink *null_sink;
pa_assert(i->sink);
null_sink = pa_hashmap_get(u->null_sinks, i->sink);
if (null_sink == NULL)
return PA_HOOK_OK;
pa_log_info("Passthrough stream removed; restore all streams");
PA_IDXSET_FOREACH(stream, null_sink->inputs, idx) {
if (stream != i)
move_stream(stream, i->sink);
}
unload_null_sink_module_for_sink(u, i->sink, c);
return PA_HOOK_OK;
}
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);
if (stream_is_fake_passthrough (i->proplist) ||
pa_sink_input_is_passthrough (i))
return passthrough_stream_removed(u, core, i);
return PA_HOOK_OK;
}
int pa__init(pa_module*m) {
pa_modargs *ma;
struct userdata *u;
pa_assert(m);
if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
pa_log("Failed to parse module arguments");
return -1;
}
m->userdata = u = pa_xnew(struct userdata, 1);
u->null_sinks = pa_hashmap_new(pa_idxset_trivial_hash_func, pa_idxset_trivial_compare_func);
u->sink_input_new_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_INPUT_NEW], PA_HOOK_LATE, (pa_hook_cb_t) sink_input_new_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);
pa_modargs_free(ma);
return 0;
}
static void unload_all_null_sink_modules(struct userdata *u, pa_core *c) {
void *state = NULL;
pa_sink *null_sink;
PA_HASHMAP_FOREACH(null_sink, u->null_sinks, state)
pa_module_unload_request_by_index(c, null_sink->module->index, true);
}
void pa__done(pa_module*m) {
struct userdata *u;
pa_assert(m);
if (!(u = m->userdata))
return;
if (u->sink_input_new_slot)
pa_hook_slot_free(u->sink_input_new_slot);
if (u->sink_input_unlink_slot)
pa_hook_slot_free(u->sink_input_unlink_slot);
if (m->core->state != PA_CORE_SHUTDOWN)
unload_all_null_sink_modules(u, m->core);
if (u->null_sinks)
pa_hashmap_free(u->null_sinks);
pa_xfree(u);
}
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