[PATCH 2/2] add module-tunnel-sink-new: experimental rewrite of module-tunnel using libpulse

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Signed-off-by: Alexander Couzens <lynxis at fe80.eu>
---
 src/Makefile.am                      |   7 +
 src/modules/module-tunnel-sink-new.c | 516 +++++++++++++++++++++++++++++++++++
 2 files changed, 523 insertions(+)
 create mode 100644 src/modules/module-tunnel-sink-new.c

diff --git a/src/Makefile.am b/src/Makefile.am
index 6de6e96..a602ee4 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1097,6 +1097,7 @@ modlibexec_LTLIBRARIES += \
 		module-remap-sink.la \
 		module-remap-source.la \
 		module-ladspa-sink.la \
+		module-tunnel-sink-new.la \
 		module-tunnel-sink.la \
 		module-tunnel-source.la \
 		module-position-event-sounds.la \
@@ -1368,6 +1369,7 @@ SYMDEF_FILES = \
 		module-ladspa-sink-symdef.h \
 		module-equalizer-sink-symdef.h \
 		module-match-symdef.h \
+		module-tunnel-sink-new-symdef.h \
 		module-tunnel-sink-symdef.h \
 		module-tunnel-source-symdef.h \
 		module-null-sink-symdef.h \
@@ -1638,6 +1640,11 @@ module_match_la_SOURCES = modules/module-match.c
 module_match_la_LDFLAGS = $(MODULE_LDFLAGS)
 module_match_la_LIBADD = $(MODULE_LIBADD)
 
+module_tunnel_sink_new_la_SOURCES = modules/module-tunnel-sink-new.c
+module_tunnel_sink_new_la_CFLAGS = -DTUNNEL_SINK_NEW=1 $(AM_CFLAGS)
+module_tunnel_sink_new_la_LDFLAGS = $(MODULE_LDFLAGS)
+module_tunnel_sink_new_la_LIBADD = $(MODULE_LIBADD)
+
 module_tunnel_sink_la_SOURCES = modules/module-tunnel.c
 module_tunnel_sink_la_CFLAGS = -DTUNNEL_SINK=1 $(AM_CFLAGS)
 module_tunnel_sink_la_LDFLAGS = $(MODULE_LDFLAGS)
diff --git a/src/modules/module-tunnel-sink-new.c b/src/modules/module-tunnel-sink-new.c
new file mode 100644
index 0000000..aa7cefc
--- /dev/null
+++ b/src/modules/module-tunnel-sink-new.c
@@ -0,0 +1,516 @@
+/***
+    This file is part of PulseAudio.
+
+    Copyright 2013 Alexander Couzens
+
+    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/context.h>
+#include <pulse/rtclock.h>
+#include <pulse/timeval.h>
+#include <pulse/xmalloc.h>
+#include <pulse/stream.h>
+#include <pulse/mainloop.h>
+
+#include <pulsecore/core.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/i18n.h>
+#include <pulsecore/sink.h>
+#include <pulsecore/modargs.h>
+#include <pulsecore/log.h>
+#include <pulsecore/thread.h>
+#include <pulsecore/thread-mq.h>
+#include <pulsecore/rtpoll.h>
+#include <pulsecore/poll.h>
+
+#include "module-tunnel-sink-new-symdef.h"
+
+PA_MODULE_AUTHOR("Alexander Couzens");
+PA_MODULE_DESCRIPTION(_("Create a network sink which connects via a stream to a remote pulseserver"));
+PA_MODULE_VERSION(PACKAGE_VERSION);
+PA_MODULE_LOAD_ONCE(false);
+PA_MODULE_USAGE(_("sink_name=<name of sink>"));
+
+#define DEFAULT_SINK_NAME "remote_sink"
+
+#define MEMBLOCKQ_MAXLENGTH (16*1024*1024)
+
+/* libpulse callbacks */
+static void stream_state_callback(pa_stream *stream, void *userdata);
+static void context_state_callback(pa_context *c, void *userdata);
+
+struct userdata {
+    pa_module *module;
+
+    pa_sink *sink;
+    pa_rtpoll *rtpoll;
+    pa_thread_mq thread_mq;
+    pa_thread_mq thread_mq_rt_shadow; /* same as thread_mq but has swapped inq/outq and own io_events */
+    pa_thread *thread;
+
+    pa_memchunk memchunk;
+
+    unsigned channels;
+    pa_usec_t block_usec;
+    pa_usec_t timestamp;
+
+    // libpulse context
+    pa_context *context;
+    pa_stream *stream;
+
+    bool connected;
+
+    pa_mainloop *rt_mainloop;
+
+    const char *remote_server;
+};
+
+static const char* const valid_modargs[] = {
+    "sink_name",
+    "sink_properties",
+    "remote_server",
+    NULL,
+};
+
+enum {
+    SINK_MESSAGE_PASS_SOCKET = PA_SINK_MESSAGE_MAX,
+    SINK_MESSAGE_RIP_SOCKET
+};
+
+static void thread_func(void *userdata) {
+    struct userdata *u = userdata;
+    pa_proplist *proplist;
+    pa_mainloop_api *rt_mainloop;
+
+    pa_assert(u);
+
+    pa_log_debug("Tunnelstream: Thread starting up");
+
+    rt_mainloop = pa_mainloop_get_api(u->rt_mainloop);
+    pa_log("rt_mainloop_api : %p", rt_mainloop );
+
+    pa_thread_mq_install(&u->thread_mq);
+
+
+    u->timestamp = pa_rtclock_now();
+
+
+
+    /* TODO: think about volume stuff remote<--stream--source */
+    proplist = pa_proplist_new();
+    pa_proplist_sets(proplist, PA_PROP_APPLICATION_NAME, _("PulseAudio mod-tunnelstream"));
+    pa_proplist_sets(proplist, PA_PROP_APPLICATION_ID, "mod-tunnelstream");
+    pa_proplist_sets(proplist, PA_PROP_APPLICATION_ICON_NAME, "audio-card");
+    pa_proplist_sets(proplist, PA_PROP_APPLICATION_VERSION, PACKAGE_VERSION);
+
+    /* init libpulse */
+    if (!(u->context = pa_context_new_with_proplist(pa_mainloop_get_api(u->rt_mainloop),
+                                              "tunnelstream",
+                                              proplist))) {
+        pa_log("Failed to create libpulse context");
+        goto fail;
+    }
+
+    pa_context_set_state_callback(u->context, context_state_callback, u);
+    if (pa_context_connect(u->context,
+                          u->remote_server,
+                          PA_CONTEXT_NOFAIL | PA_CONTEXT_NOAUTOSPAWN,
+                          NULL) < 0) {
+        pa_log("Failed to connect libpulse context");
+        goto fail;
+    }
+
+    pa_proplist_free(proplist);
+
+    for(;;)
+    {
+        int ret;
+        const void *p;
+        pa_usec_t now = 0;
+
+        size_t writeable = 0;
+
+        if(pa_mainloop_iterate(u->rt_mainloop, 1, &ret) < 0) {
+            if(ret == 0)
+                goto finish;
+            else
+                goto fail;
+
+        }
+
+        if (PA_UNLIKELY(u->sink->thread_info.rewind_requested))
+            pa_sink_process_rewind(u->sink, 0);
+
+        if (PA_SINK_IS_OPENED(u->sink->thread_info.state))
+            now = pa_rtclock_now();
+
+        if (u->connected &&
+                PA_STREAM_IS_GOOD(pa_stream_get_state(u->stream)) &&
+                PA_SINK_IS_OPENED(u->sink->thread_info.state)) {
+            /* TODO: use IS_RUNNING + cork stream */
+
+            if (pa_stream_is_corked(u->stream)) {
+                pa_stream_cork(u->stream, 0, NULL, NULL);
+            } else {
+                writeable = pa_stream_writable_size(u->stream);
+                if (writeable > 0) {
+                    if (u->memchunk.length <= 0)
+                        pa_sink_render(u->sink, writeable, &u->memchunk);
+
+                    pa_assert(u->memchunk.length > 0);
+
+
+                    /* we have new data to write */
+                    p = (const uint8_t *) pa_memblock_acquire(u->memchunk.memblock);
+                    ret = pa_stream_write(u->stream,
+                                        ((uint8_t*) p + u->memchunk.index),         /**< The data to write */
+                                        u->memchunk.length,            /**< The length of the data to write in bytes */
+                                        NULL,     /**< A cleanup routine for the data or NULL to request an internal copy */
+                                        0,          /**< Offset for seeking, must be 0 for upload streams */
+                                        PA_SEEK_RELATIVE      /**< Seek mode, must be PA_SEEK_RELATIVE for upload streams */
+                                        );
+                    pa_memblock_release(u->memchunk.memblock);
+                    pa_memblock_unref(u->memchunk.memblock);
+                    pa_memchunk_reset(&u->memchunk);
+
+                    if (ret != 0) {
+                        /* TODO: we should consider a state change or is that already done ? */
+                        pa_log_warn("Could not write data into the stream ... ret = %i", ret);
+                    }
+                }
+            }
+        }
+    }
+fail:
+    /* If this was no regular exit from the loop we have to continue
+     * processing messages until we received PA_MESSAGE_SHUTDOWN
+     *
+     * Note: is this a race condition? When a PA_MESSAGE_SHUTDOWN already within the queue?
+     */
+    pa_asyncmsgq_flush(u->thread_mq.inq, false);
+    pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->module->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
+    pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
+
+finish:
+    pa_asyncmsgq_flush(u->thread_mq.inq, false);
+
+    if (u->stream)
+        pa_stream_disconnect(u->stream);
+
+    if (u->context)
+        pa_context_disconnect(u->context);
+
+    if(u->rt_mainloop)
+        pa_mainloop_free(u->rt_mainloop);
+
+    pa_log_debug("Thread shutting down");
+}
+
+static void stream_state_callback(pa_stream *stream, void *userdata) {
+    struct userdata *u = userdata;
+
+    pa_assert(u);
+    pa_assert(stream == u->stream);
+
+    switch(pa_stream_get_state(stream)) {
+        case PA_STREAM_FAILED:
+            pa_log_debug("Context failed.");
+            pa_stream_unref(stream);
+            u->stream = NULL;
+
+            /* TODO: think about killing the context or should we just try again a creationg of a stream ? */
+            if(u->context)
+                pa_context_disconnect(u->context);
+            break;
+        case PA_STREAM_TERMINATED:
+            pa_log_debug("Context terminated.");
+            pa_stream_unref(stream);
+            u->stream = NULL;
+
+            if(u->context)
+                pa_context_disconnect(u->context);
+            break;
+        default:
+            break;
+    }
+}
+
+static void context_state_callback(pa_context *c, void *userdata) {
+    struct userdata *u = userdata;
+    int c_errno;
+
+    pa_assert(u);
+    pa_assert(u->context == c);
+
+    switch(pa_context_get_state(c)) {
+        case PA_CONTEXT_UNCONNECTED:
+        case PA_CONTEXT_CONNECTING:
+        case PA_CONTEXT_AUTHORIZING:
+        case PA_CONTEXT_SETTING_NAME:
+            pa_log_debug("Connection unconnected");
+            break;
+        case PA_CONTEXT_READY: {
+            pa_proplist *proplist;
+            pa_buffer_attr bufferattr;
+
+            pa_log_debug("Connection successful. Creating stream.");
+            pa_assert(!u->stream);
+
+            proplist = pa_proplist_new();
+            pa_assert(proplist);
+
+
+            u->stream = pa_stream_new_with_proplist(u->context,
+                                                    "mod-tunnelstream",
+                                                    &u->sink->sample_spec,
+                                                    &u->sink->channel_map,
+                                                    proplist);
+
+            pa_proplist_free(proplist);
+
+
+            memset(&bufferattr, 0, sizeof(pa_buffer_attr));
+
+            bufferattr.maxlength = (uint32_t) - 1;
+            bufferattr.minreq = (uint32_t) - 1;
+            bufferattr.prebuf = (uint32_t) - 1;
+            bufferattr.tlength = (uint32_t) - 1;
+
+            pa_stream_set_state_callback(u->stream, stream_state_callback, userdata);
+            pa_stream_connect_playback(u->stream,
+                                       NULL,
+                                       &bufferattr,
+                                       PA_STREAM_START_CORKED | PA_STREAM_AUTO_TIMING_UPDATE,
+                                       NULL,
+                                       NULL);
+
+            pa_asyncmsgq_post(u->thread_mq.inq, PA_MSGOBJECT(u->sink), SINK_MESSAGE_PASS_SOCKET, NULL, 0, NULL, NULL);
+            break;
+        }
+        case PA_CONTEXT_FAILED:
+            c_errno = pa_context_errno(u->context);
+            pa_log_debug("Context failed.");
+            u->connected = false;
+            pa_context_unref(u->context);
+            u->context = NULL;
+
+            pa_module_unload_request(u->module, false);
+            break;
+
+        case PA_CONTEXT_TERMINATED:
+            c_errno = pa_context_errno(u->context);
+            pa_log_debug("Context terminated.");
+            u->connected = false;
+            pa_context_unref(u->context);
+            u->context = NULL;
+
+            pa_module_unload_request(u->module, false);
+            break;
+        default:
+            break;
+    }
+}
+
+static int sink_process_msg_cb(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: {
+            int negative;
+            pa_usec_t remote_latency;
+
+            if (!PA_SINK_IS_LINKED(u->sink->thread_info.state)) {
+                *((pa_usec_t*) data) = 0;
+                return 0;
+            }
+
+            if(!u->stream) {
+                *((pa_usec_t*) data) = 0;
+                return 0;
+            }
+
+            if(!PA_STREAM_IS_GOOD(pa_stream_get_state(u->stream))) {
+                *((pa_usec_t*) data) = 0;
+                return 0;
+            }
+
+            if(pa_stream_get_latency(u->stream, &remote_latency, &negative) < 0) {
+                *((pa_usec_t*) data) = 0;
+                return 0;
+            }
+
+            *((pa_usec_t*) data) =
+                /* Add the latency from libpulse */
+                remote_latency;
+                /* do we have to add more latency here ? */
+            return 0;
+        }
+        case SINK_MESSAGE_PASS_SOCKET: {
+            u->connected = true;
+            return 0;
+        }
+    }
+    return pa_sink_process_msg(o, code, data, offset, chunk);
+}
+
+int pa__init(pa_module*m) {
+    struct userdata *u = NULL;
+    pa_modargs *ma = NULL;
+    pa_sink_new_data sink_data;
+    pa_sample_spec ss;
+    pa_channel_map map;
+    pa_proplist *proplist = NULL;
+    const char *remote_server = NULL;
+
+    pa_assert(m);
+
+    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+        pa_log("Failed to parse module arguments.");
+        goto fail;
+    }
+
+    ss = m->core->default_sample_spec;
+    map = m->core->default_channel_map;
+    if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
+        pa_log("Invalid sample format specification or channel map");
+        goto fail;
+    }
+
+    remote_server = pa_modargs_get_value(ma, "remote_server", NULL);
+    if (!remote_server) {
+        pa_log("No remote_server given!");
+        goto fail;
+    }
+
+    u = pa_xnew0(struct userdata, 1);
+    u->module = m;
+    m->userdata = u;
+    u->remote_server = strdup(remote_server);
+    pa_memchunk_reset(&u->memchunk);
+    u->rtpoll = pa_rtpoll_new();
+    u->rt_mainloop = pa_mainloop_new();
+    if(u->rt_mainloop == NULL) {
+        pa_log("Failed to create mainloop");
+        goto fail;
+    }
+
+    pa_thread_mq_init_rtmainloop(&u->thread_mq, m->core->mainloop, pa_mainloop_get_api(u->rt_mainloop));
+
+    /* Create sink */
+    pa_sink_new_data_init(&sink_data);
+    sink_data.driver = __FILE__;
+    sink_data.module = m;
+
+    pa_sink_new_data_set_name(&sink_data, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME));
+    pa_sink_new_data_set_sample_spec(&sink_data, &ss);
+    pa_sink_new_data_set_channel_map(&sink_data, &map);
+
+    /* TODO: set DEVICE CLASS */
+    pa_proplist_sets(sink_data.proplist, PA_PROP_DEVICE_CLASS, "abstract");
+
+    pa_proplist_setf(sink_data.proplist, PA_PROP_DEVICE_DESCRIPTION, "tunnel to remote pulseaudio %s", remote_server);
+
+    if (pa_modargs_get_proplist(ma, "sink_properties", sink_data.proplist, PA_UPDATE_REPLACE) < 0) {
+        pa_log("Invalid properties");
+        pa_sink_new_data_done(&sink_data);
+        goto fail;
+    }
+    /* TODO: check PA_SINK_LATENCY + PA_SINK_DYNAMIC_LATENCY */
+    if (!(u->sink = pa_sink_new(m->core, &sink_data, (PA_SINK_LATENCY|PA_SINK_DYNAMIC_LATENCY|PA_SINK_NETWORK)))) {
+        pa_log("Failed to create sink.");
+        pa_sink_new_data_done(&sink_data);
+        goto fail;
+    }
+
+    pa_sink_new_data_done(&sink_data);
+    u->sink->userdata = u;
+
+    /* callbacks */
+    u->sink->parent.process_msg = sink_process_msg_cb;
+
+    /* set thread queue */
+    pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
+
+    /* TODO: latency / rewind
+    u->sink->update_requested_latency = sink_update_requested_latency_cb;
+    u->block_usec = BLOCK_USEC;
+    nbytes = pa_usec_to_bytes(u->block_usec, &u->sink->sample_spec);
+    pa_sink_set_max_rewind(u->sink, nbytes);
+    pa_sink_set_max_request(u->sink, nbytes);
+    pa_sink_set_latency_range(u->sink, 0, BLOCK_USEC); */
+
+
+    if (!(u->thread = pa_thread_new("tunnelstream-sink", thread_func, u))) {
+        pa_log("Failed to create thread.");
+        goto fail;
+    }
+
+    pa_sink_put(u->sink);
+    pa_modargs_free(ma);
+
+    return 0;
+
+fail:
+    if (ma)
+        pa_modargs_free(ma);
+
+    if (proplist)
+        pa_proplist_free(proplist);
+
+    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);
+
+    if (u->thread) {
+        pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
+        pa_thread_free(u->thread);
+    }
+
+    pa_thread_mq_done(&u->thread_mq);
+
+    if(u->remote_server)
+        free((void *) u->remote_server);
+
+
+    if (u->rtpoll)
+        pa_rtpoll_free(u->rtpoll);
+
+    if (u->memchunk.memblock)
+        pa_memblock_unref(u->memchunk.memblock);
+
+    if (u->sink)
+        pa_sink_unref(u->sink);
+
+    pa_xfree(u);
+}
-- 
1.8.3.3



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