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pulseaudio/src/modules/module-loopback.c
Georg Chini d6ef0ec3dc loopback: Don't push zero-sized block to memblockq 
During my work on module-loopback I found a bug that sometimes crashes pulse when
module-loopback is loaded due to pushing a zero-length block into the memblockq.
As there is a one-line fix I thought you might want it for 6.0.
2015-02-02 13:17:35 +02:00

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/***
This file is part of PulseAudio.
Copyright 2009 Intel Corporation
Contributor: Pierre-Louis Bossart <pierre-louis.bossart@intel.com>
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, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <pulse/xmalloc.h>
#include <pulsecore/sink-input.h>
#include <pulsecore/module.h>
#include <pulsecore/modargs.h>
#include <pulsecore/namereg.h>
#include <pulsecore/log.h>
#include <pulsecore/core-util.h>
#include <pulse/rtclock.h>
#include <pulse/timeval.h>
#include "module-loopback-symdef.h"
PA_MODULE_AUTHOR("Pierre-Louis Bossart");
PA_MODULE_DESCRIPTION("Loopback from source to sink");
PA_MODULE_VERSION(PACKAGE_VERSION);
PA_MODULE_LOAD_ONCE(false);
PA_MODULE_USAGE(
"source=<source to connect to> "
"sink=<sink to connect to> "
"adjust_time=<how often to readjust rates in s> "
"latency_msec=<latency in ms> "
"format=<sample format> "
"rate=<sample rate> "
"channels=<number of channels> "
"channel_map=<channel map> "
"sink_input_properties=<proplist> "
"source_output_properties=<proplist> "
"source_dont_move=<boolean> "
"sink_dont_move=<boolean> "
"remix=<remix channels?> ");
#define DEFAULT_LATENCY_MSEC 200
#define MEMBLOCKQ_MAXLENGTH (1024*1024*16)
#define DEFAULT_ADJUST_TIME_USEC (10*PA_USEC_PER_SEC)
struct userdata {
pa_core *core;
pa_module *module;
pa_sink_input *sink_input;
pa_source_output *source_output;
pa_asyncmsgq *asyncmsgq;
pa_memblockq *memblockq;
pa_rtpoll_item *rtpoll_item_read, *rtpoll_item_write;
pa_time_event *time_event;
pa_usec_t adjust_time;
int64_t recv_counter;
int64_t send_counter;
size_t skip;
pa_usec_t latency;
bool in_pop;
size_t min_memblockq_length;
struct {
int64_t send_counter;
size_t source_output_buffer;
pa_usec_t source_latency;
int64_t recv_counter;
size_t sink_input_buffer;
pa_usec_t sink_latency;
size_t min_memblockq_length;
size_t max_request;
} latency_snapshot;
};
static const char* const valid_modargs[] = {
"source",
"sink",
"adjust_time",
"latency_msec",
"format",
"rate",
"channels",
"channel_map",
"sink_input_properties",
"source_output_properties",
"source_dont_move",
"sink_dont_move",
"remix",
NULL,
};
enum {
SINK_INPUT_MESSAGE_POST = PA_SINK_INPUT_MESSAGE_MAX,
SINK_INPUT_MESSAGE_REWIND,
SINK_INPUT_MESSAGE_LATENCY_SNAPSHOT,
SINK_INPUT_MESSAGE_MAX_REQUEST_CHANGED
};
enum {
SOURCE_OUTPUT_MESSAGE_LATENCY_SNAPSHOT
};
static void enable_adjust_timer(struct userdata *u, bool enable);
/* Called from main context */
static void teardown(struct userdata *u) {
pa_assert(u);
pa_assert_ctl_context();
u->adjust_time = 0;
enable_adjust_timer(u, false);
/* Handling the asyncmsgq between the source output and the sink input
* requires some care. When the source output is unlinked, nothing needs
* to be done for the asyncmsgq, because the source output is the sending
* end. But when the sink input is unlinked, we should ensure that the
* asyncmsgq is emptied, because the messages in the queue hold references
* to the sink input. Also, we need to ensure that new messages won't be
* written to the queue after we have emptied it.
*
* Emptying the queue can be done in the state_changed() callback of the
* sink input, when the new state is "unlinked".
*
* Preventing new messages from being written to the queue can be achieved
* by unlinking the source output before unlinking the sink input. There
* are no other writers for that queue, so this is sufficient. */
if (u->source_output) {
pa_source_output_unlink(u->source_output);
pa_source_output_unref(u->source_output);
u->source_output = NULL;
}
if (u->sink_input) {
pa_sink_input_unlink(u->sink_input);
pa_sink_input_unref(u->sink_input);
u->sink_input = NULL;
}
}
/* Called from main context */
static void adjust_rates(struct userdata *u) {
size_t buffer, fs;
uint32_t old_rate, base_rate, new_rate;
pa_usec_t buffer_latency;
pa_assert(u);
pa_assert_ctl_context();
pa_asyncmsgq_send(u->source_output->source->asyncmsgq, PA_MSGOBJECT(u->source_output), SOURCE_OUTPUT_MESSAGE_LATENCY_SNAPSHOT, NULL, 0, NULL);
pa_asyncmsgq_send(u->sink_input->sink->asyncmsgq, PA_MSGOBJECT(u->sink_input), SINK_INPUT_MESSAGE_LATENCY_SNAPSHOT, NULL, 0, NULL);
buffer =
u->latency_snapshot.sink_input_buffer +
u->latency_snapshot.source_output_buffer;
if (u->latency_snapshot.recv_counter <= u->latency_snapshot.send_counter)
buffer += (size_t) (u->latency_snapshot.send_counter - u->latency_snapshot.recv_counter);
else
buffer += PA_CLIP_SUB(buffer, (size_t) (u->latency_snapshot.recv_counter - u->latency_snapshot.send_counter));
buffer_latency = pa_bytes_to_usec(buffer, &u->sink_input->sample_spec);
pa_log_debug("Loopback overall latency is %0.2f ms + %0.2f ms + %0.2f ms = %0.2f ms",
(double) u->latency_snapshot.sink_latency / PA_USEC_PER_MSEC,
(double) buffer_latency / PA_USEC_PER_MSEC,
(double) u->latency_snapshot.source_latency / PA_USEC_PER_MSEC,
((double) u->latency_snapshot.sink_latency + buffer_latency + u->latency_snapshot.source_latency) / PA_USEC_PER_MSEC);
pa_log_debug("Should buffer %zu bytes, buffered at minimum %zu bytes",
u->latency_snapshot.max_request*2,
u->latency_snapshot.min_memblockq_length);
fs = pa_frame_size(&u->sink_input->sample_spec);
old_rate = u->sink_input->sample_spec.rate;
base_rate = u->source_output->sample_spec.rate;
if (u->latency_snapshot.min_memblockq_length < u->latency_snapshot.max_request*2)
new_rate = base_rate - (((u->latency_snapshot.max_request*2 - u->latency_snapshot.min_memblockq_length) / fs) *PA_USEC_PER_SEC)/u->adjust_time;
else
new_rate = base_rate + (((u->latency_snapshot.min_memblockq_length - u->latency_snapshot.max_request*2) / fs) *PA_USEC_PER_SEC)/u->adjust_time;
if (new_rate < (uint32_t) (base_rate*0.8) || new_rate > (uint32_t) (base_rate*1.25)) {
pa_log_warn("Sample rates too different, not adjusting (%u vs. %u).", base_rate, new_rate);
new_rate = base_rate;
} else {
if (base_rate < new_rate + 20 && new_rate < base_rate + 20)
new_rate = base_rate;
/* Do the adjustment in small steps; 2‰ can be considered inaudible */
if (new_rate < (uint32_t) (old_rate*0.998) || new_rate > (uint32_t) (old_rate*1.002)) {
pa_log_info("New rate of %u Hz not within 2‰ of %u Hz, forcing smaller adjustment", new_rate, old_rate);
new_rate = PA_CLAMP(new_rate, (uint32_t) (old_rate*0.998), (uint32_t) (old_rate*1.002));
}
}
pa_sink_input_set_rate(u->sink_input, new_rate);
pa_log_debug("[%s] Updated sampling rate to %lu Hz.", u->sink_input->sink->name, (unsigned long) new_rate);
pa_core_rttime_restart(u->core, u->time_event, pa_rtclock_now() + u->adjust_time);
}
/* Called from main context */
static void time_callback(pa_mainloop_api *a, pa_time_event *e, const struct timeval *t, void *userdata) {
struct userdata *u = userdata;
pa_assert(u);
pa_assert(a);
pa_assert(u->time_event == e);
adjust_rates(u);
}
/* Called from main context */
static void enable_adjust_timer(struct userdata *u, bool enable) {
if (enable) {
if (u->time_event || u->adjust_time <= 0)
return;
u->time_event = pa_core_rttime_new(u->module->core, pa_rtclock_now() + u->adjust_time, time_callback, u);
} else {
if (!u->time_event)
return;
u->core->mainloop->time_free(u->time_event);
u->time_event = NULL;
}
}
/* Called from main context */
static void update_adjust_timer(struct userdata *u) {
if (u->sink_input->state == PA_SINK_INPUT_CORKED || u->source_output->state == PA_SOURCE_OUTPUT_CORKED)
enable_adjust_timer(u, false);
else
enable_adjust_timer(u, true);
}
/* Called from input thread context */
static void source_output_push_cb(pa_source_output *o, const pa_memchunk *chunk) {
struct userdata *u;
pa_memchunk copy;
pa_source_output_assert_ref(o);
pa_source_output_assert_io_context(o);
pa_assert_se(u = o->userdata);
if (u->skip >= chunk->length) {
u->skip -= chunk->length;
return;
}
if (u->skip > 0) {
copy = *chunk;
copy.index += u->skip;
copy.length -= u->skip;
u->skip = 0;
chunk = &copy;
}
pa_asyncmsgq_post(u->asyncmsgq, PA_MSGOBJECT(u->sink_input), SINK_INPUT_MESSAGE_POST, NULL, 0, chunk, NULL);
u->send_counter += (int64_t) chunk->length;
}
/* Called from input thread context */
static void source_output_process_rewind_cb(pa_source_output *o, size_t nbytes) {
struct userdata *u;
pa_source_output_assert_ref(o);
pa_source_output_assert_io_context(o);
pa_assert_se(u = o->userdata);
pa_asyncmsgq_post(u->asyncmsgq, PA_MSGOBJECT(u->sink_input), SINK_INPUT_MESSAGE_REWIND, NULL, (int64_t) nbytes, NULL, NULL);
u->send_counter -= (int64_t) nbytes;
}
/* Called from output thread context */
static int source_output_process_msg_cb(pa_msgobject *obj, int code, void *data, int64_t offset, pa_memchunk *chunk) {
struct userdata *u = PA_SOURCE_OUTPUT(obj)->userdata;
switch (code) {
case SOURCE_OUTPUT_MESSAGE_LATENCY_SNAPSHOT: {
size_t length;
length = pa_memblockq_get_length(u->source_output->thread_info.delay_memblockq);
u->latency_snapshot.send_counter = u->send_counter;
u->latency_snapshot.source_output_buffer = u->source_output->thread_info.resampler ? pa_resampler_result(u->source_output->thread_info.resampler, length) : length;
u->latency_snapshot.source_latency = pa_source_get_latency_within_thread(u->source_output->source);
return 0;
}
}
return pa_source_output_process_msg(obj, code, data, offset, chunk);
}
/* Called from output thread context */
static void source_output_attach_cb(pa_source_output *o) {
struct userdata *u;
pa_source_output_assert_ref(o);
pa_source_output_assert_io_context(o);
pa_assert_se(u = o->userdata);
u->rtpoll_item_write = pa_rtpoll_item_new_asyncmsgq_write(
o->source->thread_info.rtpoll,
PA_RTPOLL_LATE,
u->asyncmsgq);
}
/* Called from output thread context */
static void source_output_detach_cb(pa_source_output *o) {
struct userdata *u;
pa_source_output_assert_ref(o);
pa_source_output_assert_io_context(o);
pa_assert_se(u = o->userdata);
if (u->rtpoll_item_write) {
pa_rtpoll_item_free(u->rtpoll_item_write);
u->rtpoll_item_write = NULL;
}
}
/* Called from output thread context */
static void source_output_state_change_cb(pa_source_output *o, pa_source_output_state_t state) {
struct userdata *u;
pa_source_output_assert_ref(o);
pa_source_output_assert_io_context(o);
pa_assert_se(u = o->userdata);
if (PA_SOURCE_OUTPUT_IS_LINKED(state) && o->thread_info.state == PA_SOURCE_OUTPUT_INIT) {
u->skip = pa_usec_to_bytes(PA_CLIP_SUB(pa_source_get_latency_within_thread(o->source),
u->latency),
&o->sample_spec);
pa_log_info("Skipping %lu bytes", (unsigned long) u->skip);
}
}
/* Called from main thread */
static void source_output_kill_cb(pa_source_output *o) {
struct userdata *u;
pa_source_output_assert_ref(o);
pa_assert_ctl_context();
pa_assert_se(u = o->userdata);
teardown(u);
pa_module_unload_request(u->module, true);
}
/* Called from main thread */
static bool source_output_may_move_to_cb(pa_source_output *o, pa_source *dest) {
struct userdata *u;
pa_source_output_assert_ref(o);
pa_assert_ctl_context();
pa_assert_se(u = o->userdata);
if (!u->sink_input || !u->sink_input->sink)
return true;
return dest != u->sink_input->sink->monitor_source;
}
/* Called from main thread */
static void source_output_moving_cb(pa_source_output *o, pa_source *dest) {
pa_proplist *p;
const char *n;
struct userdata *u;
if (!dest)
return;
pa_source_output_assert_ref(o);
pa_assert_ctl_context();
pa_assert_se(u = o->userdata);
p = pa_proplist_new();
pa_proplist_setf(p, PA_PROP_MEDIA_NAME, "Loopback of %s", pa_strnull(pa_proplist_gets(dest->proplist, PA_PROP_DEVICE_DESCRIPTION)));
if ((n = pa_proplist_gets(dest->proplist, PA_PROP_DEVICE_ICON_NAME)))
pa_proplist_sets(p, PA_PROP_MEDIA_ICON_NAME, n);
pa_sink_input_update_proplist(u->sink_input, PA_UPDATE_REPLACE, p);
pa_proplist_free(p);
if (pa_source_get_state(dest) == PA_SOURCE_SUSPENDED)
pa_sink_input_cork(u->sink_input, true);
else
pa_sink_input_cork(u->sink_input, false);
update_adjust_timer(u);
}
/* Called from main thread */
static void source_output_suspend_cb(pa_source_output *o, bool suspended) {
struct userdata *u;
pa_source_output_assert_ref(o);
pa_assert_ctl_context();
pa_assert_se(u = o->userdata);
pa_sink_input_cork(u->sink_input, suspended);
update_adjust_timer(u);
}
/* Called from output thread context */
static void update_min_memblockq_length(struct userdata *u) {
size_t length;
pa_assert(u);
pa_sink_input_assert_io_context(u->sink_input);
length = pa_memblockq_get_length(u->memblockq);
if (u->min_memblockq_length == (size_t) -1 ||
length < u->min_memblockq_length)
u->min_memblockq_length = length;
}
/* Called from output 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_sink_input_assert_io_context(i);
pa_assert_se(u = i->userdata);
pa_assert(chunk);
u->in_pop = true;
while (pa_asyncmsgq_process_one(u->asyncmsgq) > 0)
;
u->in_pop = false;
if (pa_memblockq_peek(u->memblockq, chunk) < 0) {
pa_log_info("Could not peek into queue");
return -1;
}
chunk->length = PA_MIN(chunk->length, nbytes);
pa_memblockq_drop(u->memblockq, chunk->length);
update_min_memblockq_length(u);
return 0;
}
/* Called from output 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_sink_input_assert_io_context(i);
pa_assert_se(u = i->userdata);
pa_memblockq_rewind(u->memblockq, nbytes);
}
/* Called from output thread context */
static int sink_input_process_msg_cb(pa_msgobject *obj, int code, void *data, int64_t offset, pa_memchunk *chunk) {
struct userdata *u = PA_SINK_INPUT(obj)->userdata;
switch (code) {
case PA_SINK_INPUT_MESSAGE_GET_LATENCY: {
pa_usec_t *r = data;
pa_sink_input_assert_io_context(u->sink_input);
*r = pa_bytes_to_usec(pa_memblockq_get_length(u->memblockq), &u->sink_input->sample_spec);
/* Fall through, the default handler will add in the extra
* latency added by the resampler */
break;
}
case SINK_INPUT_MESSAGE_POST:
pa_sink_input_assert_io_context(u->sink_input);
if (PA_SINK_IS_OPENED(u->sink_input->sink->thread_info.state))
pa_memblockq_push_align(u->memblockq, chunk);
else
pa_memblockq_flush_write(u->memblockq, true);
update_min_memblockq_length(u);
/* Is this the end of an underrun? Then let's start things
* right-away */
if (!u->in_pop &&
u->sink_input->thread_info.underrun_for > 0 &&
pa_memblockq_is_readable(u->memblockq)) {
pa_log_debug("Requesting rewind due to end of underrun.");
pa_sink_input_request_rewind(u->sink_input,
(size_t) (u->sink_input->thread_info.underrun_for == (size_t) -1 ? 0 : u->sink_input->thread_info.underrun_for),
false, true, false);
}
u->recv_counter += (int64_t) chunk->length;
return 0;
case SINK_INPUT_MESSAGE_REWIND:
pa_sink_input_assert_io_context(u->sink_input);
if (PA_SINK_IS_OPENED(u->sink_input->sink->thread_info.state))
pa_memblockq_seek(u->memblockq, -offset, PA_SEEK_RELATIVE, true);
else
pa_memblockq_flush_write(u->memblockq, true);
u->recv_counter -= offset;
update_min_memblockq_length(u);
return 0;
case SINK_INPUT_MESSAGE_LATENCY_SNAPSHOT: {
size_t length;
update_min_memblockq_length(u);
length = pa_memblockq_get_length(u->sink_input->thread_info.render_memblockq);
u->latency_snapshot.recv_counter = u->recv_counter;
u->latency_snapshot.sink_input_buffer =
pa_memblockq_get_length(u->memblockq) +
(u->sink_input->thread_info.resampler ? pa_resampler_request(u->sink_input->thread_info.resampler, length) : length);
u->latency_snapshot.sink_latency = pa_sink_get_latency_within_thread(u->sink_input->sink);
u->latency_snapshot.max_request = pa_sink_input_get_max_request(u->sink_input);
u->latency_snapshot.min_memblockq_length = u->min_memblockq_length;
u->min_memblockq_length = (size_t) -1;
return 0;
}
case SINK_INPUT_MESSAGE_MAX_REQUEST_CHANGED: {
/* This message is sent from the IO thread to the main
* thread! So don't be confused. All the user cases above
* are executed in thread context, but this one is not! */
pa_assert_ctl_context();
if (u->time_event)
adjust_rates(u);
return 0;
}
}
return pa_sink_input_process_msg(obj, code, data, offset, chunk);
}
/* Called from output thread context */
static void sink_input_attach_cb(pa_sink_input *i) {
struct userdata *u;
pa_sink_input_assert_ref(i);
pa_sink_input_assert_io_context(i);
pa_assert_se(u = i->userdata);
u->rtpoll_item_read = pa_rtpoll_item_new_asyncmsgq_read(
i->sink->thread_info.rtpoll,
PA_RTPOLL_LATE,
u->asyncmsgq);
pa_memblockq_set_prebuf(u->memblockq, pa_sink_input_get_max_request(i)*2);
pa_memblockq_set_maxrewind(u->memblockq, pa_sink_input_get_max_rewind(i));
u->min_memblockq_length = (size_t) -1;
}
/* Called from output thread context */
static void sink_input_detach_cb(pa_sink_input *i) {
struct userdata *u;
pa_sink_input_assert_ref(i);
pa_sink_input_assert_io_context(i);
pa_assert_se(u = i->userdata);
if (u->rtpoll_item_read) {
pa_rtpoll_item_free(u->rtpoll_item_read);
u->rtpoll_item_read = NULL;
}
}
/* Called from output 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_sink_input_assert_io_context(i);
pa_assert_se(u = i->userdata);
pa_memblockq_set_maxrewind(u->memblockq, nbytes);
}
/* Called from output 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_sink_input_assert_io_context(i);
pa_assert_se(u = i->userdata);
pa_memblockq_set_prebuf(u->memblockq, nbytes*2);
pa_log_info("Max request changed");
pa_asyncmsgq_post(pa_thread_mq_get()->outq, PA_MSGOBJECT(u->sink_input), SINK_INPUT_MESSAGE_MAX_REQUEST_CHANGED, NULL, 0, NULL, NULL);
}
/* Called from main thread */
static void sink_input_kill_cb(pa_sink_input *i) {
struct userdata *u;
pa_sink_input_assert_ref(i);
pa_assert_ctl_context();
pa_assert_se(u = i->userdata);
teardown(u);
pa_module_unload_request(u->module, true);
}
/* Called from the output 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 (state == PA_SINK_INPUT_UNLINKED)
pa_asyncmsgq_flush(u->asyncmsgq, false);
}
/* Called from main thread */
static void sink_input_moving_cb(pa_sink_input *i, pa_sink *dest) {
struct userdata *u;
pa_proplist *p;
const char *n;
if (!dest)
return;
pa_sink_input_assert_ref(i);
pa_assert_ctl_context();
pa_assert_se(u = i->userdata);
p = pa_proplist_new();
pa_proplist_setf(p, PA_PROP_MEDIA_NAME, "Loopback to %s", pa_strnull(pa_proplist_gets(dest->proplist, PA_PROP_DEVICE_DESCRIPTION)));
if ((n = pa_proplist_gets(dest->proplist, PA_PROP_DEVICE_ICON_NAME)))
pa_proplist_sets(p, PA_PROP_MEDIA_ICON_NAME, n);
pa_source_output_update_proplist(u->source_output, PA_UPDATE_REPLACE, p);
pa_proplist_free(p);
if (pa_sink_get_state(dest) == PA_SINK_SUSPENDED)
pa_source_output_cork(u->source_output, true);
else
pa_source_output_cork(u->source_output, false);
update_adjust_timer(u);
}
/* Called from main thread */
static bool sink_input_may_move_to_cb(pa_sink_input *i, pa_sink *dest) {
struct userdata *u;
pa_sink_input_assert_ref(i);
pa_assert_ctl_context();
pa_assert_se(u = i->userdata);
if (!u->source_output || !u->source_output->source)
return true;
return dest != u->source_output->source->monitor_of;
}
/* Called from main thread */
static void sink_input_suspend_cb(pa_sink_input *i, bool suspended) {
struct userdata *u;
pa_sink_input_assert_ref(i);
pa_assert_ctl_context();
pa_assert_se(u = i->userdata);
pa_source_output_cork(u->source_output, suspended);
update_adjust_timer(u);
}
int pa__init(pa_module *m) {
pa_modargs *ma = NULL;
struct userdata *u;
pa_sink *sink = NULL;
pa_sink_input_new_data sink_input_data;
bool sink_dont_move;
pa_source *source = NULL;
pa_source_output_new_data source_output_data;
bool source_dont_move;
uint32_t latency_msec;
pa_sample_spec ss;
pa_channel_map map;
bool format_set = false;
bool rate_set = false;
bool channels_set = false;
pa_memchunk silence;
uint32_t adjust_time_sec;
const char *n;
bool remix = true;
pa_assert(m);
if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
pa_log("Failed to parse module arguments");
goto fail;
}
n = pa_modargs_get_value(ma, "source", NULL);
if (n && !(source = pa_namereg_get(m->core, n, PA_NAMEREG_SOURCE))) {
pa_log("No such source.");
goto fail;
}
n = pa_modargs_get_value(ma, "sink", NULL);
if (n && !(sink = pa_namereg_get(m->core, n, PA_NAMEREG_SINK))) {
pa_log("No such sink.");
goto fail;
}
if (pa_modargs_get_value_boolean(ma, "remix", &remix) < 0) {
pa_log("Invalid boolean remix parameter");
goto fail;
}
if (sink) {
ss = sink->sample_spec;
map = sink->channel_map;
format_set = true;
rate_set = true;
channels_set = true;
} else if (source) {
ss = source->sample_spec;
map = source->channel_map;
format_set = true;
rate_set = true;
channels_set = true;
} else {
/* FIXME: Dummy stream format, needed because pa_sink_input_new()
* requires valid sample spec and channel map even when all the FIX_*
* stream flags are specified. pa_sink_input_new() should be changed
* to ignore the sample spec and channel map when the FIX_* flags are
* present. */
ss.format = PA_SAMPLE_U8;
ss.rate = 8000;
ss.channels = 1;
map.channels = 1;
map.map[0] = PA_CHANNEL_POSITION_MONO;
}
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;
}
if (pa_modargs_get_value(ma, "format", NULL))
format_set = true;
if (pa_modargs_get_value(ma, "rate", NULL))
rate_set = true;
if (pa_modargs_get_value(ma, "channels", NULL) || pa_modargs_get_value(ma, "channel_map", NULL))
channels_set = true;
latency_msec = DEFAULT_LATENCY_MSEC;
if (pa_modargs_get_value_u32(ma, "latency_msec", &latency_msec) < 0 || latency_msec < 1 || latency_msec > 30000) {
pa_log("Invalid latency specification");
goto fail;
}
m->userdata = u = pa_xnew0(struct userdata, 1);
u->core = m->core;
u->module = m;
u->latency = (pa_usec_t) latency_msec * PA_USEC_PER_MSEC;
adjust_time_sec = DEFAULT_ADJUST_TIME_USEC / PA_USEC_PER_SEC;
if (pa_modargs_get_value_u32(ma, "adjust_time", &adjust_time_sec) < 0) {
pa_log("Failed to parse adjust_time value");
goto fail;
}
if (adjust_time_sec != DEFAULT_ADJUST_TIME_USEC / PA_USEC_PER_SEC)
u->adjust_time = adjust_time_sec * PA_USEC_PER_SEC;
else
u->adjust_time = DEFAULT_ADJUST_TIME_USEC;
pa_sink_input_new_data_init(&sink_input_data);
sink_input_data.driver = __FILE__;
sink_input_data.module = m;
if (sink)
pa_sink_input_new_data_set_sink(&sink_input_data, sink, false);
if (pa_modargs_get_proplist(ma, "sink_input_properties", sink_input_data.proplist, PA_UPDATE_REPLACE) < 0) {
pa_log("Failed to parse the sink_input_properties value.");
pa_sink_input_new_data_done(&sink_input_data);
goto fail;
}
if (!pa_proplist_contains(sink_input_data.proplist, PA_PROP_MEDIA_ROLE))
pa_proplist_sets(sink_input_data.proplist, PA_PROP_MEDIA_ROLE, "abstract");
pa_sink_input_new_data_set_sample_spec(&sink_input_data, &ss);
pa_sink_input_new_data_set_channel_map(&sink_input_data, &map);
sink_input_data.flags = PA_SINK_INPUT_VARIABLE_RATE | PA_SINK_INPUT_START_CORKED;
if (!remix)
sink_input_data.flags |= PA_SINK_INPUT_NO_REMIX;
if (!format_set)
sink_input_data.flags |= PA_SINK_INPUT_FIX_FORMAT;
if (!rate_set)
sink_input_data.flags |= PA_SINK_INPUT_FIX_RATE;
if (!channels_set)
sink_input_data.flags |= PA_SINK_INPUT_FIX_CHANNELS;
sink_dont_move = false;
if (pa_modargs_get_value_boolean(ma, "sink_dont_move", &sink_dont_move) < 0) {
pa_log("sink_dont_move= expects a boolean argument.");
goto fail;
}
if (sink_dont_move)
sink_input_data.flags |= PA_SINK_INPUT_DONT_MOVE;
pa_sink_input_new(&u->sink_input, m->core, &sink_input_data);
pa_sink_input_new_data_done(&sink_input_data);
if (!u->sink_input)
goto fail;
/* If format, rate or channels were originally unset, they are set now
* after the pa_sink_input_new() call. */
ss = u->sink_input->sample_spec;
map = u->sink_input->channel_map;
u->sink_input->parent.process_msg = sink_input_process_msg_cb;
u->sink_input->pop = sink_input_pop_cb;
u->sink_input->process_rewind = sink_input_process_rewind_cb;
u->sink_input->kill = sink_input_kill_cb;
u->sink_input->state_change = sink_input_state_change_cb;
u->sink_input->attach = sink_input_attach_cb;
u->sink_input->detach = sink_input_detach_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->may_move_to = sink_input_may_move_to_cb;
u->sink_input->moving = sink_input_moving_cb;
u->sink_input->suspend = sink_input_suspend_cb;
u->sink_input->userdata = u;
pa_sink_input_set_requested_latency(u->sink_input, u->latency/3);
pa_source_output_new_data_init(&source_output_data);
source_output_data.driver = __FILE__;
source_output_data.module = m;
if (source)
pa_source_output_new_data_set_source(&source_output_data, source, false);
if (pa_modargs_get_proplist(ma, "source_output_properties", source_output_data.proplist, PA_UPDATE_REPLACE) < 0) {
pa_log("Failed to parse the source_output_properties value.");
pa_source_output_new_data_done(&source_output_data);
goto fail;
}
if (!pa_proplist_contains(source_output_data.proplist, PA_PROP_MEDIA_ROLE))
pa_proplist_sets(source_output_data.proplist, PA_PROP_MEDIA_ROLE, "abstract");
pa_source_output_new_data_set_sample_spec(&source_output_data, &ss);
pa_source_output_new_data_set_channel_map(&source_output_data, &map);
source_output_data.flags = PA_SOURCE_OUTPUT_START_CORKED;
if (!remix)
source_output_data.flags |= PA_SOURCE_OUTPUT_NO_REMIX;
source_dont_move = false;
if (pa_modargs_get_value_boolean(ma, "source_dont_move", &source_dont_move) < 0) {
pa_log("source_dont_move= expects a boolean argument.");
goto fail;
}
if (source_dont_move)
source_output_data.flags |= PA_SOURCE_OUTPUT_DONT_MOVE;
pa_source_output_new(&u->source_output, m->core, &source_output_data);
pa_source_output_new_data_done(&source_output_data);
if (!u->source_output)
goto fail;
u->source_output->parent.process_msg = source_output_process_msg_cb;
u->source_output->push = source_output_push_cb;
u->source_output->process_rewind = source_output_process_rewind_cb;
u->source_output->kill = source_output_kill_cb;
u->source_output->attach = source_output_attach_cb;
u->source_output->detach = source_output_detach_cb;
u->source_output->state_change = source_output_state_change_cb;
u->source_output->may_move_to = source_output_may_move_to_cb;
u->source_output->moving = source_output_moving_cb;
u->source_output->suspend = source_output_suspend_cb;
u->source_output->userdata = u;
pa_source_output_set_requested_latency(u->source_output, u->latency/3);
pa_sink_input_get_silence(u->sink_input, &silence);
u->memblockq = pa_memblockq_new(
"module-loopback memblockq",
0, /* idx */
MEMBLOCKQ_MAXLENGTH, /* maxlength */
MEMBLOCKQ_MAXLENGTH, /* tlength */
&ss, /* sample_spec */
0, /* prebuf */
0, /* minreq */
0, /* maxrewind */
&silence); /* silence frame */
pa_memblock_unref(silence.memblock);
u->asyncmsgq = pa_asyncmsgq_new(0);
if (!pa_proplist_contains(u->source_output->proplist, PA_PROP_MEDIA_NAME))
pa_proplist_setf(u->source_output->proplist, PA_PROP_MEDIA_NAME, "Loopback to %s",
pa_strnull(pa_proplist_gets(u->sink_input->sink->proplist, PA_PROP_DEVICE_DESCRIPTION)));
if (!pa_proplist_contains(u->source_output->proplist, PA_PROP_MEDIA_ICON_NAME)
&& (n = pa_proplist_gets(u->sink_input->sink->proplist, PA_PROP_DEVICE_ICON_NAME)))
pa_proplist_sets(u->source_output->proplist, PA_PROP_MEDIA_ICON_NAME, n);
if (!pa_proplist_contains(u->sink_input->proplist, PA_PROP_MEDIA_NAME))
pa_proplist_setf(u->sink_input->proplist, PA_PROP_MEDIA_NAME, "Loopback from %s",
pa_strnull(pa_proplist_gets(u->source_output->source->proplist, PA_PROP_DEVICE_DESCRIPTION)));
if (source && !pa_proplist_contains(u->sink_input->proplist, PA_PROP_MEDIA_ICON_NAME)
&& (n = pa_proplist_gets(u->source_output->source->proplist, PA_PROP_DEVICE_ICON_NAME)))
pa_proplist_sets(u->sink_input->proplist, PA_PROP_MEDIA_ICON_NAME, n);
pa_sink_input_put(u->sink_input);
pa_source_output_put(u->source_output);
if (pa_source_get_state(u->source_output->source) != PA_SOURCE_SUSPENDED)
pa_sink_input_cork(u->sink_input, false);
if (pa_sink_get_state(u->sink_input->sink) != PA_SINK_SUSPENDED)
pa_source_output_cork(u->source_output, false);
update_adjust_timer(u);
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;
teardown(u);
if (u->memblockq)
pa_memblockq_free(u->memblockq);
if (u->asyncmsgq)
pa_asyncmsgq_unref(u->asyncmsgq);
pa_xfree(u);
}
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