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|
/***
This file is part of PulseAudio.
Copyright 2004-2006 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 <stdlib.h>
#include <limits.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <pulse/xmalloc.h>
#include <pulse/timeval.h>
#include <pulsecore/sink-input.h>
#include <pulsecore/source-output.h>
#include <pulsecore/client.h>
#include <pulsecore/sample-util.h>
#include <pulsecore/namereg.h>
#include <pulsecore/log.h>
#include <pulsecore/core-error.h>
#include <pulsecore/atomic.h>
#include <pulsecore/thread-mq.h>
#include <pulsecore/core-util.h>
#include <pulsecore/shared.h>
#include "protocol-simple.h"
/* Don't allow more than this many concurrent connections */
#define MAX_CONNECTIONS 10
typedef struct connection {
pa_msgobject parent;
pa_simple_protocol *protocol;
pa_simple_options *options;
pa_iochannel *io;
pa_sink_input *sink_input;
pa_source_output *source_output;
pa_client *client;
pa_memblockq *input_memblockq, *output_memblockq;
pa_bool_t dead;
struct {
pa_memblock *current_memblock;
size_t memblock_index;
pa_atomic_t missing;
pa_bool_t underrun;
} playback;
} connection;
PA_DECLARE_CLASS(connection);
#define CONNECTION(o) (connection_cast(o))
static PA_DEFINE_CHECK_TYPE(connection, pa_msgobject);
struct pa_simple_protocol {
PA_REFCNT_DECLARE;
pa_core *core;
pa_idxset *connections;
};
enum {
SINK_INPUT_MESSAGE_POST_DATA = PA_SINK_INPUT_MESSAGE_MAX, /* data from main loop to sink input */
SINK_INPUT_MESSAGE_DISABLE_PREBUF /* disabled prebuf, get playback started. */
};
enum {
CONNECTION_MESSAGE_REQUEST_DATA, /* data requested from sink input from the main loop */
CONNECTION_MESSAGE_POST_DATA, /* data from source output to main loop */
CONNECTION_MESSAGE_UNLINK_CONNECTION /* Please drop a aconnection now */
};
#define PLAYBACK_BUFFER_SECONDS (.5)
#define PLAYBACK_BUFFER_FRAGMENTS (10)
#define RECORD_BUFFER_SECONDS (5)
#define DEFAULT_SINK_LATENCY (300*PA_USEC_PER_MSEC)
#define DEFAULT_SOURCE_LATENCY (300*PA_USEC_PER_MSEC)
static void connection_unlink(connection *c) {
pa_assert(c);
if (!c->protocol)
return;
if (c->options) {
pa_simple_options_unref(c->options);
c->options = NULL;
}
if (c->sink_input) {
pa_sink_input_unlink(c->sink_input);
pa_sink_input_unref(c->sink_input);
c->sink_input = NULL;
}
if (c->source_output) {
pa_source_output_unlink(c->source_output);
pa_source_output_unref(c->source_output);
c->source_output = NULL;
}
if (c->client) {
pa_client_free(c->client);
c->client = NULL;
}
if (c->io) {
pa_iochannel_free(c->io);
c->io = NULL;
}
pa_assert_se(pa_idxset_remove_by_data(c->protocol->connections, c, NULL) == c);
c->protocol = NULL;
connection_unref(c);
}
static void connection_free(pa_object *o) {
connection *c = CONNECTION(o);
pa_assert(c);
if (c->playback.current_memblock)
pa_memblock_unref(c->playback.current_memblock);
if (c->input_memblockq)
pa_memblockq_free(c->input_memblockq);
if (c->output_memblockq)
pa_memblockq_free(c->output_memblockq);
pa_xfree(c);
}
static int do_read(connection *c) {
pa_memchunk chunk;
ssize_t r;
size_t l;
void *p;
size_t space;
connection_assert_ref(c);
if (!c->sink_input || (l = (size_t) pa_atomic_load(&c->playback.missing)) <= 0)
return 0;
if (c->playback.current_memblock) {
space = pa_memblock_get_length(c->playback.current_memblock) - c->playback.memblock_index;
if (space <= 0) {
pa_memblock_unref(c->playback.current_memblock);
c->playback.current_memblock = NULL;
}
}
if (!c->playback.current_memblock) {
pa_assert_se(c->playback.current_memblock = pa_memblock_new(c->protocol->core->mempool, (size_t) -1));
c->playback.memblock_index = 0;
space = pa_memblock_get_length(c->playback.current_memblock);
}
if (l > space)
l = space;
p = pa_memblock_acquire(c->playback.current_memblock);
r = pa_iochannel_read(c->io, (uint8_t*) p + c->playback.memblock_index, l);
pa_memblock_release(c->playback.current_memblock);
if (r <= 0) {
if (r < 0 && (errno == EINTR || errno == EAGAIN))
return 0;
pa_log_debug("read(): %s", r == 0 ? "EOF" : pa_cstrerror(errno));
return -1;
}
chunk.memblock = c->playback.current_memblock;
chunk.index = c->playback.memblock_index;
chunk.length = (size_t) r;
c->playback.memblock_index += (size_t) r;
pa_asyncmsgq_post(c->sink_input->sink->asyncmsgq, PA_MSGOBJECT(c->sink_input), SINK_INPUT_MESSAGE_POST_DATA, NULL, 0, &chunk, NULL);
pa_atomic_sub(&c->playback.missing, (int) r);
return 0;
}
static int do_write(connection *c) {
pa_memchunk chunk;
ssize_t r;
void *p;
connection_assert_ref(c);
if (!c->source_output)
return 0;
if (pa_memblockq_peek(c->output_memblockq, &chunk) < 0) {
/* pa_log("peek failed"); */
return 0;
}
pa_assert(chunk.memblock);
pa_assert(chunk.length);
p = pa_memblock_acquire(chunk.memblock);
r = pa_iochannel_write(c->io, (uint8_t*) p+chunk.index, chunk.length);
pa_memblock_release(chunk.memblock);
pa_memblock_unref(chunk.memblock);
if (r < 0) {
if (errno == EINTR || errno == EAGAIN)
return 0;
pa_log("write(): %s", pa_cstrerror(errno));
return -1;
}
pa_memblockq_drop(c->output_memblockq, (size_t) r);
return 0;
}
static void do_work(connection *c) {
connection_assert_ref(c);
if (c->dead)
return;
if (pa_iochannel_is_readable(c->io))
if (do_read(c) < 0)
goto fail;
if (!c->sink_input && pa_iochannel_is_hungup(c->io))
goto fail;
if (pa_iochannel_is_writable(c->io))
if (do_write(c) < 0)
goto fail;
return;
fail:
if (c->sink_input) {
/* If there is a sink input, we first drain what we already have read before shutting down the connection */
c->dead = TRUE;
pa_iochannel_free(c->io);
c->io = NULL;
pa_asyncmsgq_post(c->sink_input->sink->asyncmsgq, PA_MSGOBJECT(c->sink_input), SINK_INPUT_MESSAGE_DISABLE_PREBUF, NULL, 0, NULL, NULL);
} else
connection_unlink(c);
}
static int connection_process_msg(pa_msgobject *o, int code, void*userdata, int64_t offset, pa_memchunk *chunk) {
connection *c = CONNECTION(o);
connection_assert_ref(c);
switch (code) {
case CONNECTION_MESSAGE_REQUEST_DATA:
do_work(c);
break;
case CONNECTION_MESSAGE_POST_DATA:
/* pa_log("got data %u", chunk->length); */
pa_memblockq_push_align(c->output_memblockq, chunk);
do_work(c);
break;
case CONNECTION_MESSAGE_UNLINK_CONNECTION:
connection_unlink(c);
break;
}
return 0;
}
/*** sink_input callbacks ***/
/* Called from thread context */
static int sink_input_process_msg(pa_msgobject *o, int code, void *userdata, int64_t offset, pa_memchunk *chunk) {
pa_sink_input *i = PA_SINK_INPUT(o);
connection*c;
pa_sink_input_assert_ref(i);
c = CONNECTION(i->userdata);
connection_assert_ref(c);
switch (code) {
case SINK_INPUT_MESSAGE_POST_DATA: {
pa_assert(chunk);
/* New data from the main loop */
pa_memblockq_push_align(c->input_memblockq, chunk);
if (pa_memblockq_is_readable(c->input_memblockq) && c->playback.underrun) {
pa_log_debug("Requesting rewind due to end of underrun.");
pa_sink_input_request_rewind(c->sink_input, 0, FALSE, TRUE, FALSE);
}
/* pa_log("got data, %u", pa_memblockq_get_length(c->input_memblockq)); */
return 0;
}
case SINK_INPUT_MESSAGE_DISABLE_PREBUF:
pa_memblockq_prebuf_disable(c->input_memblockq);
return 0;
case PA_SINK_INPUT_MESSAGE_GET_LATENCY: {
pa_usec_t *r = userdata;
*r = pa_bytes_to_usec(pa_memblockq_get_length(c->input_memblockq), &c->sink_input->sample_spec);
/* Fall through, the default handler will add in the extra
* latency added by the resampler */
}
default:
return pa_sink_input_process_msg(o, code, userdata, offset, chunk);
}
}
/* Called from thread context */
static int sink_input_pop_cb(pa_sink_input *i, size_t length, pa_memchunk *chunk) {
connection *c;
pa_sink_input_assert_ref(i);
c = CONNECTION(i->userdata);
connection_assert_ref(c);
pa_assert(chunk);
if (pa_memblockq_peek(c->input_memblockq, chunk) < 0) {
c->playback.underrun = TRUE;
if (c->dead && pa_sink_input_safe_to_remove(i))
pa_asyncmsgq_post(pa_thread_mq_get()->outq, PA_MSGOBJECT(c), CONNECTION_MESSAGE_UNLINK_CONNECTION, NULL, 0, NULL, NULL);
return -1;
} else {
size_t m;
chunk->length = PA_MIN(length, chunk->length);
c->playback.underrun = FALSE;
pa_memblockq_drop(c->input_memblockq, chunk->length);
m = pa_memblockq_pop_missing(c->input_memblockq);
if (m > 0)
if (pa_atomic_add(&c->playback.missing, (int) m) <= 0)
pa_asyncmsgq_post(pa_thread_mq_get()->outq, PA_MSGOBJECT(c), CONNECTION_MESSAGE_REQUEST_DATA, NULL, 0, NULL, NULL);
return 0;
}
}
/* Called from thread context */
static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) {
connection *c;
pa_sink_input_assert_ref(i);
c = CONNECTION(i->userdata);
connection_assert_ref(c);
/* If we are in an underrun, then we don't rewind */
if (i->thread_info.underrun_for > 0)
return;
pa_memblockq_rewind(c->input_memblockq, nbytes);
}
/* Called from thread context */
static void sink_input_update_max_rewind_cb(pa_sink_input *i, size_t nbytes) {
connection *c;
pa_sink_input_assert_ref(i);
c = CONNECTION(i->userdata);
connection_assert_ref(c);
pa_memblockq_set_maxrewind(c->input_memblockq, nbytes);
}
/* Called from main context */
static void sink_input_kill_cb(pa_sink_input *i) {
pa_sink_input_assert_ref(i);
connection_unlink(CONNECTION(i->userdata));
}
/*** source_output callbacks ***/
/* Called from thread context */
static void source_output_push_cb(pa_source_output *o, const pa_memchunk *chunk) {
connection *c;
pa_source_output_assert_ref(o);
c = CONNECTION(o->userdata);
pa_assert(c);
pa_assert(chunk);
pa_asyncmsgq_post(pa_thread_mq_get()->outq, PA_MSGOBJECT(c), CONNECTION_MESSAGE_POST_DATA, NULL, 0, chunk, NULL);
}
/* Called from main context */
static void source_output_kill_cb(pa_source_output *o) {
pa_source_output_assert_ref(o);
connection_unlink(CONNECTION(o->userdata));
}
/* Called from main context */
static pa_usec_t source_output_get_latency_cb(pa_source_output *o) {
connection*c;
pa_source_output_assert_ref(o);
c = CONNECTION(o->userdata);
pa_assert(c);
return pa_bytes_to_usec(pa_memblockq_get_length(c->output_memblockq), &c->source_output->sample_spec);
}
/*** client callbacks ***/
static void client_kill_cb(pa_client *client) {
connection*c;
pa_assert(client);
c = CONNECTION(client->userdata);
pa_assert(c);
connection_unlink(c);
}
/*** pa_iochannel callbacks ***/
static void io_callback(pa_iochannel*io, void *userdata) {
connection *c = CONNECTION(userdata);
connection_assert_ref(c);
pa_assert(io);
do_work(c);
}
/*** socket_server callbacks ***/
void pa_simple_protocol_connect(pa_simple_protocol *p, pa_iochannel *io, pa_simple_options *o) {
connection *c = NULL;
char pname[128];
pa_client_new_data client_data;
pa_assert(p);
pa_assert(io);
pa_assert(o);
if (pa_idxset_size(p->connections)+1 > MAX_CONNECTIONS) {
pa_log("Warning! Too many connections (%u), dropping incoming connection.", MAX_CONNECTIONS);
pa_iochannel_free(io);
return;
}
c = pa_msgobject_new(connection);
c->parent.parent.free = connection_free;
c->parent.process_msg = connection_process_msg;
c->io = io;
pa_iochannel_set_callback(c->io, io_callback, c);
c->sink_input = NULL;
c->source_output = NULL;
c->input_memblockq = c->output_memblockq = NULL;
c->protocol = p;
c->options = pa_simple_options_ref(o);
c->playback.current_memblock = NULL;
c->playback.memblock_index = 0;
c->dead = FALSE;
c->playback.underrun = TRUE;
pa_atomic_store(&c->playback.missing, 0);
pa_client_new_data_init(&client_data);
client_data.module = o->module;
client_data.driver = __FILE__;
pa_iochannel_socket_peer_to_string(io, pname, sizeof(pname));
pa_proplist_setf(client_data.proplist, PA_PROP_APPLICATION_NAME, "Simple client (%s)", pname);
pa_proplist_sets(client_data.proplist, "simple-protocol.peer", pname);
c->client = pa_client_new(p->core, &client_data);
pa_client_new_data_done(&client_data);
if (!c->client)
goto fail;
c->client->kill = client_kill_cb;
c->client->userdata = c;
if (o->playback) {
pa_sink_input_new_data data;
size_t l;
pa_sink *sink;
if (!(sink = pa_namereg_get(c->protocol->core, o->default_sink, PA_NAMEREG_SINK))) {
pa_log("Failed to get sink.");
goto fail;
}
pa_sink_input_new_data_init(&data);
data.driver = __FILE__;
data.module = o->module;
data.client = c->client;
data.sink = sink;
pa_proplist_update(data.proplist, PA_UPDATE_MERGE, c->client->proplist);
pa_sink_input_new_data_set_sample_spec(&data, &o->sample_spec);
pa_sink_input_new(&c->sink_input, p->core, &data, 0);
pa_sink_input_new_data_done(&data);
if (!c->sink_input) {
pa_log("Failed to create sink input.");
goto fail;
}
c->sink_input->parent.process_msg = sink_input_process_msg;
c->sink_input->pop = sink_input_pop_cb;
c->sink_input->process_rewind = sink_input_process_rewind_cb;
c->sink_input->update_max_rewind = sink_input_update_max_rewind_cb;
c->sink_input->kill = sink_input_kill_cb;
c->sink_input->userdata = c;
pa_sink_input_set_requested_latency(c->sink_input, DEFAULT_SINK_LATENCY);
l = (size_t) ((double) pa_bytes_per_second(&o->sample_spec)*PLAYBACK_BUFFER_SECONDS);
c->input_memblockq = pa_memblockq_new(
0,
l,
l,
pa_frame_size(&o->sample_spec),
(size_t) -1,
l/PLAYBACK_BUFFER_FRAGMENTS,
0,
NULL);
pa_iochannel_socket_set_rcvbuf(io, l);
pa_atomic_store(&c->playback.missing, (int) pa_memblockq_missing(c->input_memblockq));
pa_sink_input_put(c->sink_input);
}
if (o->record) {
pa_source_output_new_data data;
size_t l;
pa_source *source;
if (!(source = pa_namereg_get(c->protocol->core, o->default_source, PA_NAMEREG_SOURCE))) {
pa_log("Failed to get source.");
goto fail;
}
pa_source_output_new_data_init(&data);
data.driver = __FILE__;
data.module = o->module;
data.client = c->client;
data.source = source;
pa_proplist_update(data.proplist, PA_UPDATE_MERGE, c->client->proplist);
pa_source_output_new_data_set_sample_spec(&data, &o->sample_spec);
pa_source_output_new(&c->source_output, p->core, &data, 0);
pa_source_output_new_data_done(&data);
if (!c->source_output) {
pa_log("Failed to create source output.");
goto fail;
}
c->source_output->push = source_output_push_cb;
c->source_output->kill = source_output_kill_cb;
c->source_output->get_latency = source_output_get_latency_cb;
c->source_output->userdata = c;
pa_source_output_set_requested_latency(c->source_output, DEFAULT_SOURCE_LATENCY);
l = (size_t) (pa_bytes_per_second(&o->sample_spec)*RECORD_BUFFER_SECONDS);
c->output_memblockq = pa_memblockq_new(
0,
l,
0,
pa_frame_size(&o->sample_spec),
1,
0,
0,
NULL);
pa_iochannel_socket_set_sndbuf(io, l);
pa_source_output_put(c->source_output);
}
pa_idxset_put(p->connections, c, NULL);
return;
fail:
if (c)
connection_unlink(c);
}
void pa_simple_protocol_disconnect(pa_simple_protocol *p, pa_module *m) {
connection *c;
void *state = NULL;
pa_assert(p);
pa_assert(m);
while ((c = pa_idxset_iterate(p->connections, &state, NULL)))
if (c->options->module == m)
connection_unlink(c);
}
static pa_simple_protocol* simple_protocol_new(pa_core *c) {
pa_simple_protocol *p;
pa_assert(c);
p = pa_xnew(pa_simple_protocol, 1);
PA_REFCNT_INIT(p);
p->core = c;
p->connections = pa_idxset_new(NULL, NULL);
pa_assert_se(pa_shared_set(c, "simple-protocol", p) >= 0);
return p;
}
pa_simple_protocol* pa_simple_protocol_get(pa_core *c) {
pa_simple_protocol *p;
if ((p = pa_shared_get(c, "simple-protocol")))
return pa_simple_protocol_ref(p);
return simple_protocol_new(c);
}
pa_simple_protocol* pa_simple_protocol_ref(pa_simple_protocol *p) {
pa_assert(p);
pa_assert(PA_REFCNT_VALUE(p) >= 1);
PA_REFCNT_INC(p);
return p;
}
void pa_simple_protocol_unref(pa_simple_protocol *p) {
connection *c;
pa_assert(p);
pa_assert(PA_REFCNT_VALUE(p) >= 1);
if (PA_REFCNT_DEC(p) > 0)
return;
while ((c = pa_idxset_first(p->connections, NULL)))
connection_unlink(c);
pa_idxset_free(p->connections, NULL, NULL);
pa_assert_se(pa_shared_remove(p->core, "simple-protocol") >= 0);
pa_xfree(p);
}
pa_simple_options* pa_simple_options_new(void) {
pa_simple_options *o;
o = pa_xnew0(pa_simple_options, 1);
PA_REFCNT_INIT(o);
o->record = FALSE;
o->playback = TRUE;
return o;
}
pa_simple_options* pa_simple_options_ref(pa_simple_options *o) {
pa_assert(o);
pa_assert(PA_REFCNT_VALUE(o) >= 1);
PA_REFCNT_INC(o);
return o;
}
void pa_simple_options_unref(pa_simple_options *o) {
pa_assert(o);
pa_assert(PA_REFCNT_VALUE(o) >= 1);
if (PA_REFCNT_DEC(o) > 0)
return;
pa_xfree(o->default_sink);
pa_xfree(o->default_source);
pa_xfree(o);
}
int pa_simple_options_parse(pa_simple_options *o, pa_core *c, pa_modargs *ma) {
pa_bool_t enabled;
pa_assert(o);
pa_assert(PA_REFCNT_VALUE(o) >= 1);
pa_assert(ma);
o->sample_spec = c->default_sample_spec;
if (pa_modargs_get_sample_spec_and_channel_map(ma, &o->sample_spec, &o->channel_map, PA_CHANNEL_MAP_DEFAULT) < 0) {
pa_log("Failed to parse sample type specification.");
return -1;
}
pa_xfree(o->default_source);
o->default_source = pa_xstrdup(pa_modargs_get_value(ma, "source", NULL));
pa_xfree(o->default_sink);
o->default_sink = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));
enabled = o->record;
if (pa_modargs_get_value_boolean(ma, "record", &enabled) < 0) {
pa_log("record= expects a boolean argument.");
return -1;
}
o->record = enabled;
enabled = o->playback;
if (pa_modargs_get_value_boolean(ma, "playback", &enabled) < 0) {
pa_log("playback= expects a boolean argument.");
return -1;
}
o->playback = enabled;
if (!o->playback && !o->record) {
pa_log("neither playback nor recording enabled for protocol.");
return -1;
}
return 0;
}
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