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/**
* xrdp: A Remote Desktop Protocol server.
* pulse sink
*
* Copyright (C) Jay Sorg 2013
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* see pulse-notes.txt
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <unistd.h>
#include <errno.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/types.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
#include <sys/ioctl.h>
#include <poll.h>
#include <pulse/rtclock.h>
#include <pulse/timeval.h>
#include <pulse/xmalloc.h>
#include <pulsecore/core-error.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>
/* defined in pulse/version.h */
#if PA_PROTOCOL_VERSION > 28
/* these used to be defined in pulsecore/macro.h */
typedef bool pa_bool_t;
#define FALSE ((pa_bool_t) 0)
#define TRUE (!FALSE)
#else
#endif
#include "module-xrdp-sink-symdef.h"
PA_MODULE_AUTHOR("Jay Sorg");
PA_MODULE_DESCRIPTION("xrdp sink");
PA_MODULE_VERSION(PACKAGE_VERSION);
PA_MODULE_LOAD_ONCE(FALSE);
PA_MODULE_USAGE(
"sink_name=<name for the sink> "
"sink_properties=<properties for the sink> "
"format=<sample format> "
"rate=<sample rate> "
"channels=<number of channels> "
"channel_map=<channel map>");
#define DEFAULT_SINK_NAME "xrdp-sink"
#define BLOCK_USEC 30000
//#define BLOCK_USEC (PA_USEC_PER_SEC * 2)
#define CHANSRV_PORT_STR "/var/run/xrdp/sockdir/xrdp_chansrv_audio_out_socket_%d"
struct userdata {
pa_core *core;
pa_module *module;
pa_sink *sink;
pa_thread *thread;
pa_thread_mq thread_mq;
pa_rtpoll *rtpoll;
pa_usec_t block_usec;
pa_usec_t timestamp;
pa_usec_t failed_connect_time;
pa_usec_t last_send_time;
int fd; /* unix domain socket connection to xrdp chansrv */
int display_num;
int skip_bytes;
int got_max_latency;
};
static const char* const valid_modargs[] = {
"sink_name",
"sink_properties",
"format",
"rate",
"channels",
"channel_map",
NULL
};
static int close_send(struct userdata *u);
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;
pa_usec_t now;
long lat;
pa_log_debug("sink_process_msg: code %d", code);
switch (code) {
case PA_SINK_MESSAGE_SET_VOLUME: /* 3 */
break;
case PA_SINK_MESSAGE_SET_MUTE: /* 6 */
break;
case PA_SINK_MESSAGE_GET_LATENCY: /* 7 */
now = pa_rtclock_now();
lat = u->timestamp > now ? u->timestamp - now : 0ULL;
pa_log_debug("sink_process_msg: lat %ld", lat);
*((pa_usec_t*) data) = lat;
return 0;
case PA_SINK_MESSAGE_GET_REQUESTED_LATENCY: /* 8 */
break;
case PA_SINK_MESSAGE_SET_STATE: /* 9 */
if (PA_PTR_TO_UINT(data) == PA_SINK_RUNNING) /* 0 */ {
pa_log("sink_process_msg: running");
u->timestamp = pa_rtclock_now();
} else {
pa_log("sink_process_msg: not running");
close_send(u);
}
break;
}
return pa_sink_process_msg(o, code, data, offset, chunk);
}
static void sink_update_requested_latency_cb(pa_sink *s) {
struct userdata *u;
size_t nbytes;
pa_sink_assert_ref(s);
pa_assert_se(u = s->userdata);
u->block_usec = BLOCK_USEC;
//u->block_usec = pa_sink_get_requested_latency_within_thread(s);
pa_log("1 block_usec %d", u->block_usec);
u->got_max_latency = 0;
if (u->block_usec == (pa_usec_t) -1) {
u->block_usec = s->thread_info.max_latency;
pa_log_debug("2 block_usec %d", u->block_usec);
u->got_max_latency = 1;
}
nbytes = pa_usec_to_bytes(u->block_usec, &s->sample_spec);
pa_sink_set_max_rewind_within_thread(s, nbytes);
pa_sink_set_max_request_within_thread(s, nbytes);
}
static void process_rewind(struct userdata *u, pa_usec_t now) {
size_t rewind_nbytes, in_buffer;
pa_usec_t delay;
pa_assert(u);
/* Figure out how much we shall rewind and reset the counter */
rewind_nbytes = u->sink->thread_info.rewind_nbytes;
u->sink->thread_info.rewind_nbytes = 0;
pa_assert(rewind_nbytes > 0);
pa_log_debug("Requested to rewind %lu bytes.",
(unsigned long) rewind_nbytes);
if (u->timestamp <= now)
goto do_nothing;
delay = u->timestamp - now;
in_buffer = pa_usec_to_bytes(delay, &u->sink->sample_spec);
if (in_buffer <= 0)
goto do_nothing;
if (rewind_nbytes > in_buffer)
rewind_nbytes = in_buffer;
pa_sink_process_rewind(u->sink, rewind_nbytes);
u->timestamp -= pa_bytes_to_usec(rewind_nbytes, &u->sink->sample_spec);
u->skip_bytes += rewind_nbytes;
pa_log_debug("Rewound %lu bytes.", (unsigned long) rewind_nbytes);
return;
do_nothing:
pa_sink_process_rewind(u->sink, 0);
}
struct header {
int code;
int bytes;
};
static int get_display_num_from_display(char *display_text) {
int index;
int mode;
int host_index;
int disp_index;
int scre_index;
int display_num;
char host[256];
char disp[256];
char scre[256];
if (display_text == NULL) {
return 0;
}
memset(host, 0, 256);
memset(disp, 0, 256);
memset(scre, 0, 256);
index = 0;
host_index = 0;
disp_index = 0;
scre_index = 0;
mode = 0;
while (display_text[index] != 0) {
if (display_text[index] == ':') {
mode = 1;
} else if (display_text[index] == '.') {
mode = 2;
} else if (mode == 0) {
host[host_index] = display_text[index];
host_index++;
} else if (mode == 1) {
disp[disp_index] = display_text[index];
disp_index++;
} else if (mode == 2) {
scre[scre_index] = display_text[index];
scre_index++;
}
index++;
}
host[host_index] = 0;
disp[disp_index] = 0;
scre[scre_index] = 0;
display_num = atoi(disp);
return display_num;
}
static int lsend(int fd, char *data, int bytes) {
int sent = 0;
int error;
while (sent < bytes) {
error = send(fd, data + sent, bytes - sent, 0);
if (error < 1) {
return error;
}
sent += error;
}
return sent;
}
static int data_send(struct userdata *u, pa_memchunk *chunk) {
char *data;
int bytes;
int sent;
int fd;
struct header h;
struct sockaddr_un s;
if (u->fd == 0) {
if (u->failed_connect_time != 0) {
if (pa_rtclock_now() - u->failed_connect_time < 1000000) {
return 0;
}
}
fd = socket(PF_LOCAL, SOCK_STREAM, 0);
memset(&s, 0, sizeof(s));
s.sun_family = AF_UNIX;
bytes = sizeof(s.sun_path) - 1;
snprintf(s.sun_path, bytes, CHANSRV_PORT_STR, u->display_num);
pa_log_debug("trying to connect to %s", s.sun_path);
if (connect(fd, (struct sockaddr *)&s,
sizeof(struct sockaddr_un)) != 0) {
u->failed_connect_time = pa_rtclock_now();
pa_log_debug("Connected failed");
close(fd);
return 0;
}
u->failed_connect_time = 0;
pa_log("Connected ok fd %d", fd);
u->fd = fd;
}
bytes = chunk->length;
pa_log_debug("bytes %d", bytes);
/* from rewind */
if (u->skip_bytes > 0) {
if (bytes > u->skip_bytes) {
bytes -= u->skip_bytes;
u->skip_bytes = 0;
} else {
u->skip_bytes -= bytes;
return bytes;
}
}
h.code = 0;
h.bytes = bytes + 8;
if (lsend(u->fd, (char*)(&h), 8) != 8) {
pa_log("data_send: send failed");
close(u->fd);
u->fd = 0;
return 0;
} else {
pa_log_debug("data_send: sent header ok bytes %d", bytes);
}
data = (char*)pa_memblock_acquire(chunk->memblock);
data += chunk->index;
sent = lsend(u->fd, data, bytes);
pa_memblock_release(chunk->memblock);
if (sent != bytes) {
pa_log("data_send: send failed sent %d bytes %d", sent, bytes);
close(u->fd);
u->fd = 0;
return 0;
}
return sent;
}
static int close_send(struct userdata *u) {
struct header h;
pa_log("close_send:");
if (u->fd == 0) {
return 0;
}
h.code = 1;
h.bytes = 8;
if (lsend(u->fd, (char*)(&h), 8) != 8) {
pa_log("close_send: send failed");
close(u->fd);
u->fd = 0;
return 0;
} else {
pa_log_debug("close_send: sent header ok");
}
return 8;
}
static void process_render(struct userdata *u, pa_usec_t now) {
pa_memchunk chunk;
int request_bytes;
pa_assert(u);
if (u->got_max_latency) {
return;
}
pa_log_debug("process_render: u->block_usec %d", u->block_usec);
while (u->timestamp < now + u->block_usec) {
request_bytes = u->sink->thread_info.max_request;
request_bytes = MIN(request_bytes, 16 * 1024);
pa_sink_render(u->sink, request_bytes, &chunk);
data_send(u, &chunk);
pa_memblock_unref(chunk.memblock);
u->timestamp += pa_bytes_to_usec(chunk.length, &u->sink->sample_spec);
}
}
static void thread_func(void *userdata) {
struct userdata *u = userdata;
int ret;
pa_usec_t now;
pa_assert(u);
pa_log_debug("Thread starting up");
pa_thread_mq_install(&u->thread_mq);
u->timestamp = pa_rtclock_now();
for (;;) {
if (u->sink->thread_info.state == PA_SINK_RUNNING) {
now = pa_rtclock_now();
if (u->sink->thread_info.rewind_requested) {
if (u->sink->thread_info.rewind_nbytes > 0) {
process_rewind(u, now);
} else {
pa_sink_process_rewind(u->sink, 0);
}
}
if (u->timestamp <= now) {
pa_log_debug("thread_func: calling process_render");
process_render(u, now);
}
pa_rtpoll_set_timer_absolute(u->rtpoll, u->timestamp);
} else {
pa_rtpoll_set_timer_disabled(u->rtpoll);
}
#if defined(PA_CHECK_VERSION) && PA_CHECK_VERSION(6, 0, 0)
if ((ret = pa_rtpoll_run(u->rtpoll)) < 0) {
#else
if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0) {
#endif
goto fail;
}
if (ret == 0) {
goto finish;
}
}
fail:
/* If this was no regular exit from the loop we have to continue
* processing messages until we received PA_MESSAGE_SHUTDOWN */
pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core),
PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0,
NULL, NULL);
pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
finish:
pa_log_debug("Thread shutting down");
}
int pa__init(pa_module*m) {
struct userdata *u = NULL;
pa_sample_spec ss;
pa_channel_map map;
pa_modargs *ma = NULL;
pa_sink_new_data data;
size_t nbytes;
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;
}
m->userdata = u = pa_xnew0(struct userdata, 1);
u->core = m->core;
u->module = m;
u->rtpoll = pa_rtpoll_new();
pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
pa_sink_new_data_init(&data);
data.driver = __FILE__;
data.module = m;
pa_sink_new_data_set_name(&data,
pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME));
pa_sink_new_data_set_sample_spec(&data, &ss);
pa_sink_new_data_set_channel_map(&data, &map);
pa_proplist_sets(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "xrdp sink");
pa_proplist_sets(data.proplist, PA_PROP_DEVICE_CLASS, "abstract");
if (pa_modargs_get_proplist(ma, "sink_properties", data.proplist,
PA_UPDATE_REPLACE) < 0) {
pa_log("Invalid properties");
pa_sink_new_data_done(&data);
goto fail;
}
u->sink = pa_sink_new(m->core, &data,
PA_SINK_LATENCY | PA_SINK_DYNAMIC_LATENCY);
pa_sink_new_data_done(&data);
if (!u->sink) {
pa_log("Failed to create sink object.");
goto fail;
}
u->sink->parent.process_msg = sink_process_msg;
u->sink->update_requested_latency = sink_update_requested_latency_cb;
u->sink->userdata = u;
pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
pa_sink_set_rtpoll(u->sink, u->rtpoll);
u->block_usec = BLOCK_USEC;
pa_log_debug("3 block_usec %d", u->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);
u->display_num = get_display_num_from_display(getenv("DISPLAY"));
#if defined(PA_CHECK_VERSION)
#if PA_CHECK_VERSION(0, 9, 22)
if (!(u->thread = pa_thread_new("xrdp-sink", thread_func, u))) {
#else
if (!(u->thread = pa_thread_new(thread_func, u))) {
#endif
#else
if (!(u->thread = pa_thread_new(thread_func, u))) {
#endif
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);
}
pa__done(m);
return -1;
}
int pa__get_n_used(pa_module *m) {
struct userdata *u;
pa_assert(m);
pa_assert_se(u = m->userdata);
return pa_sink_linked_by(u->sink);
}
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->sink) {
pa_sink_unref(u->sink);
}
if (u->rtpoll) {
pa_rtpoll_free(u->rtpoll);
}
pa_xfree(u);
}
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