1 files changed, 429 insertions, 0 deletions

diff --git a/src/modules/module-remap-sink.c b/src/modules/module-remap-sink.c
new file mode 100644
index 00000000..c87b1ece
--- /dev/null
+++ b/src/modules/module-remap-sink.c
@@ -0,0 +1,429 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2008 Lennart Poettering
+
+  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 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-error.h>
+#include <pulsecore/namereg.h>
+#include <pulsecore/sink.h>
+#include <pulsecore/module.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/modargs.h>
+#include <pulsecore/log.h>
+#include <pulsecore/thread.h>
+#include <pulsecore/thread-mq.h>
+#include <pulsecore/rtpoll.h>
+
+#include "module-remap-sink-symdef.h"
+
+PA_MODULE_AUTHOR("Lennart Poettering");
+PA_MODULE_DESCRIPTION("Virtual channel remapping sink");
+PA_MODULE_VERSION(PACKAGE_VERSION);
+PA_MODULE_LOAD_ONCE(FALSE);
+PA_MODULE_USAGE(
+        "sink_name=<name for the sink> "
+        "master=<name of sink to remap> "
+        "master_channel_map=<channel map> "
+        "format=<sample format> "
+        "channels=<number of channels> "
+        "rate=<sample rate> "
+        "channel_map=<channel map> "
+        "remix=<remix channels?>");
+
+struct userdata {
+    pa_core *core;
+    pa_module *module;
+
+    pa_sink *sink, *master;
+    pa_sink_input *sink_input;
+};
+
+static const char* const valid_modargs[] = {
+    "sink_name",
+    "master",
+    "master_channel_map",
+    "rate",
+    "format",
+    "channels",
+    "channel_map",
+    "remix",
+    NULL
+};
+
+/* Called from I/O thread context */
+static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
+    struct userdata *u = PA_SINK(o)->userdata;
+
+    switch (code) {
+
+        case PA_SINK_MESSAGE_GET_LATENCY: {
+            pa_usec_t usec = 0;
+
+            /* Get the latency of the master sink */
+            if (PA_MSGOBJECT(u->master)->process_msg(PA_MSGOBJECT(u->master), PA_SINK_MESSAGE_GET_LATENCY, &usec, 0, NULL) < 0)
+                usec = 0;
+
+            /* Add the latency internal to our sink input on top */
+            usec += pa_bytes_to_usec(pa_memblockq_get_length(u->sink_input->thread_info.render_memblockq), &u->master->sample_spec);
+
+            *((pa_usec_t*) data) = usec;
+            return 0;
+        }
+    }
+
+    return pa_sink_process_msg(o, code, data, offset, chunk);
+}
+
+/* Called from main context */
+static int sink_set_state(pa_sink *s, pa_sink_state_t state) {
+    struct userdata *u;
+
+    pa_sink_assert_ref(s);
+    pa_assert_se(u = s->userdata);
+
+    if (PA_SINK_IS_LINKED(state) &&
+        u->sink_input &&
+        PA_SINK_INPUT_IS_LINKED(pa_sink_input_get_state(u->sink_input)))
+
+        pa_sink_input_cork(u->sink_input, state == PA_SINK_SUSPENDED);
+
+    return 0;
+}
+
+/* Called from I/O thread context */
+static void sink_request_rewind(pa_sink *s) {
+    struct userdata *u;
+
+    pa_sink_assert_ref(s);
+    pa_assert_se(u = s->userdata);
+
+    pa_sink_input_request_rewind(u->sink_input, s->thread_info.rewind_nbytes, TRUE, FALSE);
+}
+
+/* Called from I/O thread context */
+static void sink_update_requested_latency(pa_sink *s) {
+    struct userdata *u;
+
+    pa_sink_assert_ref(s);
+    pa_assert_se(u = s->userdata);
+
+    /* Just hand this one over to the master sink */
+    pa_sink_input_set_requested_latency_within_thread(
+            u->sink_input,
+            pa_sink_get_requested_latency_within_thread(s));
+}
+
+/* Called from I/O thread context */
+static int sink_input_pop_cb(pa_sink_input *i, size_t nbytes, pa_memchunk *chunk) {
+    struct userdata *u;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert(chunk);
+    pa_assert_se(u = i->userdata);
+
+    if (!u->sink || !PA_SINK_IS_OPENED(u->sink->thread_info.state))
+        return -1;
+
+    pa_sink_render(u->sink, nbytes, chunk);
+    return 0;
+}
+
+/* Called from I/O thread context */
+static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) {
+    struct userdata *u;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(u = i->userdata);
+    pa_assert(nbytes > 0);
+
+    if (!u->sink || !PA_SINK_IS_OPENED(u->sink->thread_info.state))
+        return;
+
+    if (u->sink->thread_info.rewind_nbytes > 0) {
+        size_t amount;
+
+        amount = PA_MIN(u->sink->thread_info.rewind_nbytes, nbytes);
+        u->sink->thread_info.rewind_nbytes = 0;
+
+        if (amount > 0)
+            pa_sink_process_rewind(u->sink, amount);
+    }
+}
+
+/* Called from I/O thread context */
+static void sink_input_update_max_rewind_cb(pa_sink_input *i, size_t nbytes) {
+    struct userdata *u;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(u = i->userdata);
+
+    if (!u->sink || !PA_SINK_IS_LINKED(u->sink->thread_info.state))
+        return;
+
+    pa_sink_set_max_rewind(u->sink, nbytes);
+}
+
+/* Called from I/O thread context */
+static void sink_input_update_max_request_cb(pa_sink_input *i, size_t nbytes) {
+    struct userdata *u;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(u = i->userdata);
+
+    if (!u->sink || !PA_SINK_IS_LINKED(u->sink->thread_info.state))
+        return;
+
+    pa_sink_set_max_request(u->sink, nbytes);
+}
+
+/* Called from I/O thread context */
+static void sink_input_update_sink_latency_range_cb(pa_sink_input *i) {
+    struct userdata *u;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(u = i->userdata);
+
+    if (!u->sink || !PA_SINK_IS_LINKED(u->sink->thread_info.state))
+        return;
+
+    pa_sink_update_latency_range(u->sink, i->sink->thread_info.min_latency, i->sink->thread_info.max_latency);
+}
+
+/* Called from I/O thread context */
+static void sink_input_detach_cb(pa_sink_input *i) {
+    struct userdata *u;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(u = i->userdata);
+
+    if (!u->sink || !PA_SINK_IS_LINKED(u->sink->thread_info.state))
+        return;
+
+    pa_sink_detach_within_thread(u->sink);
+    pa_sink_set_asyncmsgq(u->sink, NULL);
+    pa_sink_set_rtpoll(u->sink, NULL);
+}
+
+/* Called from I/O thread context */
+static void sink_input_attach_cb(pa_sink_input *i) {
+    struct userdata *u;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(u = i->userdata);
+
+    if (!u->sink || !PA_SINK_IS_LINKED(u->sink->thread_info.state))
+        return;
+
+    pa_sink_set_asyncmsgq(u->sink, i->sink->asyncmsgq);
+    pa_sink_set_rtpoll(u->sink, i->sink->rtpoll);
+    pa_sink_attach_within_thread(u->sink);
+
+    pa_sink_update_latency_range(u->sink, u->master->thread_info.min_latency, u->master->thread_info.max_latency);
+}
+
+/* Called from main context */
+static void sink_input_kill_cb(pa_sink_input *i) {
+    struct userdata *u;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(u = i->userdata);
+
+    pa_sink_unlink(u->sink);
+    pa_sink_input_unlink(u->sink_input);
+
+    pa_sink_unref(u->sink);
+    u->sink = NULL;
+    pa_sink_input_unref(u->sink_input);
+    u->sink_input = NULL;
+
+    pa_module_unload_request(u->module);
+}
+
+/* Called from IO thread context */
+static void sink_input_state_change_cb(pa_sink_input *i, pa_sink_input_state_t state) {
+    struct userdata *u;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(u = i->userdata);
+
+    /* If we are added for the first time, ask for a rewinding so that
+     * we are heard right-away. */
+    if (PA_SINK_INPUT_IS_LINKED(state) &&
+        i->thread_info.state == PA_SINK_INPUT_INIT) {
+        pa_log_debug("Requesting rewind due to state change.");
+        pa_sink_input_request_rewind(i, 0, FALSE, TRUE);
+    }
+}
+
+int pa__init(pa_module*m) {
+    struct userdata *u;
+    pa_sample_spec ss;
+    pa_channel_map sink_map, stream_map;
+    pa_modargs *ma;
+    const char *k;
+    pa_sink *master;
+    pa_sink_input_new_data sink_input_data;
+    pa_sink_new_data sink_data;
+    pa_bool_t remix = TRUE;
+
+    pa_assert(m);
+
+    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+        pa_log("Failed to parse module arguments.");
+        goto fail;
+    }
+
+    if (!(master = pa_namereg_get(m->core, pa_modargs_get_value(ma, "master", NULL), PA_NAMEREG_SINK, 1))) {
+        pa_log("Master sink not found");
+        goto fail;
+    }
+
+    ss = master->sample_spec;
+    sink_map = master->channel_map;
+    if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &sink_map, PA_CHANNEL_MAP_DEFAULT) < 0) {
+        pa_log("Invalid sample format specification or channel map");
+        goto fail;
+    }
+
+    stream_map = sink_map;
+    if (pa_modargs_get_channel_map(ma, "master_channel_map", &stream_map) < 0) {
+        pa_log("Invalid master channel map");
+        goto fail;
+    }
+
+    if (stream_map.channels != ss.channels) {
+        pa_log("Number of channels doesn't match");
+        goto fail;
+    }
+
+    if (pa_channel_map_equal(&stream_map, &master->channel_map))
+        pa_log_warn("No remapping configured, proceeding nonetheless!");
+
+    if (pa_modargs_get_value_boolean(ma, "remix", &remix) < 0) {
+        pa_log("Invalid boolean remix parameter");
+        goto fail;
+    }
+
+    u = pa_xnew0(struct userdata, 1);
+    u->core = m->core;
+    u->module = m;
+    m->userdata = u;
+    u->master = master;
+    u->sink = NULL;
+    u->sink_input = NULL;
+
+    /* Create sink */
+    pa_sink_new_data_init(&sink_data);
+    sink_data.driver = __FILE__;
+    sink_data.module = m;
+    if (!(sink_data.name = pa_xstrdup(pa_modargs_get_value(ma, "sink_name", NULL))))
+        sink_data.name = pa_sprintf_malloc("%s.remapped", master->name);
+    pa_sink_new_data_set_sample_spec(&sink_data, &ss);
+    pa_sink_new_data_set_channel_map(&sink_data, &sink_map);
+    k = pa_proplist_gets(master->proplist, PA_PROP_DEVICE_DESCRIPTION);
+    pa_proplist_setf(sink_data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Remapped %s", k ? k : master->name);
+    pa_proplist_sets(sink_data.proplist, PA_PROP_DEVICE_MASTER_DEVICE, master->name);
+    pa_proplist_sets(sink_data.proplist, PA_PROP_DEVICE_CLASS, "filter");
+
+    u->sink = pa_sink_new(m->core, &sink_data, PA_SINK_LATENCY);
+    pa_sink_new_data_done(&sink_data);
+
+    if (!u->sink) {
+        pa_log("Failed to create sink.");
+        goto fail;
+    }
+
+    u->sink->parent.process_msg = sink_process_msg;
+    u->sink->set_state = sink_set_state;
+    u->sink->update_requested_latency = sink_update_requested_latency;
+    u->sink->request_rewind = sink_request_rewind;
+    u->sink->userdata = u;
+
+    pa_sink_set_asyncmsgq(u->sink, master->asyncmsgq);
+    pa_sink_set_rtpoll(u->sink, master->rtpoll);
+
+    /* Create sink input */
+    pa_sink_input_new_data_init(&sink_input_data);
+    sink_input_data.driver = __FILE__;
+    sink_input_data.module = m;
+    sink_input_data.sink = u->master;
+    pa_proplist_sets(sink_input_data.proplist, PA_PROP_MEDIA_NAME, "Remapped Stream");
+    pa_proplist_sets(sink_input_data.proplist, PA_PROP_MEDIA_ROLE, "filter");
+    pa_sink_input_new_data_set_sample_spec(&sink_input_data, &ss);
+    pa_sink_input_new_data_set_channel_map(&sink_input_data, &stream_map);
+
+    u->sink_input = pa_sink_input_new(m->core, &sink_input_data, PA_SINK_INPUT_DONT_MOVE | (remix ? 0 : PA_SINK_INPUT_NO_REMIX));
+    pa_sink_input_new_data_done(&sink_input_data);
+
+    if (!u->sink_input)
+        goto fail;
+
+    u->sink_input->pop = sink_input_pop_cb;
+    u->sink_input->process_rewind = sink_input_process_rewind_cb;
+    u->sink_input->update_max_rewind = sink_input_update_max_rewind_cb;
+    u->sink_input->update_max_request = sink_input_update_max_request_cb;
+    u->sink_input->update_sink_latency_range = sink_input_update_sink_latency_range_cb;
+    u->sink_input->attach = sink_input_attach_cb;
+    u->sink_input->detach = sink_input_detach_cb;
+    u->sink_input->kill = sink_input_kill_cb;
+    u->sink_input->state_change = sink_input_state_change_cb;
+    u->sink_input->userdata = u;
+
+    pa_sink_put(u->sink);
+    pa_sink_input_put(u->sink_input);
+
+    pa_modargs_free(ma);
+
+    return 0;
+
+fail:
+    if (ma)
+        pa_modargs_free(ma);
+
+    pa__done(m);
+
+    return -1;
+}
+
+void pa__done(pa_module*m) {
+    struct userdata *u;
+
+    pa_assert(m);
+
+    if (!(u = m->userdata))
+        return;
+
+    if (u->sink) {
+        pa_sink_unlink(u->sink);
+        pa_sink_unref(u->sink);
+    }
+
+    if (u->sink_input) {
+        pa_sink_input_unlink(u->sink_input);
+        pa_sink_input_unref(u->sink_input);
+    }
+
+    pa_xfree(u);
+}