code.delx.au - pulseaudio/blob - polyp/protocol-simple.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <assert.h>
  27 #include <stdlib.h>
  28 #include <limits.h>
  29 #include <stdio.h>
  30 #include <errno.h>
  31 #include <string.h>
  32
  33 #include "sink-input.h"
  34 #include "source-output.h"
  35 #include "protocol-simple.h"
  36 #include "client.h"
  37 #include "sample-util.h"
  38 #include "namereg.h"
  39 #include "xmalloc.h"
  40 #include "log.h"
  41
  42 struct connection {
  43     struct pa_protocol_simple *protocol;
  44     struct pa_iochannel *io;
  45     struct pa_sink_input *sink_input;
  46     struct pa_source_output *source_output;
  47     struct pa_client *client;
  48     struct pa_memblockq *input_memblockq, *output_memblockq;
  49     struct pa_defer_event *defer_event;
  50
  51     struct {
  52         struct pa_memblock *current_memblock;
  53         size_t memblock_index, fragment_size;
  54     } playback;
  55 };
  56
  57 struct pa_protocol_simple {
  58     struct pa_module *module;
  59     struct pa_core *core;
  60     struct pa_socket_server*server;
  61     struct pa_idxset *connections;
  62     enum {
  63         RECORD = 1,
  64         PLAYBACK = 2,
  65         DUPLEX = 3
  66     } mode;
  67     struct pa_sample_spec sample_spec;
  68     char *source_name, *sink_name;
  69 };
  70
  71 #define PLAYBACK_BUFFER_SECONDS (.5)
  72 #define PLAYBACK_BUFFER_FRAGMENTS (10)
  73 #define RECORD_BUFFER_SECONDS (5)
  74 #define RECORD_BUFFER_FRAGMENTS (100)
  75
  76 static void connection_free(struct connection *c) {
  77     assert(c);
  78
  79     pa_idxset_remove_by_data(c->protocol->connections, c, NULL);
  80
  81     if (c->playback.current_memblock)
  82         pa_memblock_unref(c->playback.current_memblock);
  83     if (c->sink_input)
  84         pa_sink_input_free(c->sink_input);
  85     if (c->source_output)
  86         pa_source_output_free(c->source_output);
  87     if (c->client)
  88         pa_client_free(c->client);
  89     if (c->io)
  90         pa_iochannel_free(c->io);
  91     if (c->input_memblockq)
  92         pa_memblockq_free(c->input_memblockq);
  93     if (c->output_memblockq)
  94         pa_memblockq_free(c->output_memblockq);
  95     if (c->defer_event)
  96         c->protocol->core->mainloop->defer_free(c->defer_event);
  97     pa_xfree(c);
  98 }
  99
 100 static int do_read(struct connection *c) {
 101     struct pa_memchunk chunk;
 102     ssize_t r;
 103     size_t l;
 104
 105     if (!c->sink_input || !(l = pa_memblockq_missing(c->input_memblockq)))
 106         return 0;
 107
 108     if (l > c->playback.fragment_size)
 109         l = c->playback.fragment_size;
 110
 111     if (c->playback.current_memblock)
 112         if (c->playback.current_memblock->length - c->playback.memblock_index < l) {
 113             pa_memblock_unref(c->playback.current_memblock);
 114             c->playback.current_memblock = NULL;
 115             c->playback.memblock_index = 0;
 116         }
 117
 118     if (!c->playback.current_memblock) {
 119         c->playback.current_memblock = pa_memblock_new(c->playback.fragment_size*2, c->protocol->core->memblock_stat);
 120         assert(c->playback.current_memblock && c->playback.current_memblock->length >= l);
 121         c->playback.memblock_index = 0;
 122     }
 123
 124     if ((r = pa_iochannel_read(c->io, (uint8_t*) c->playback.current_memblock->data+c->playback.memblock_index, l)) <= 0) {
 125         pa_log(__FILE__": read() failed: %s\n", r == 0 ? "EOF" : strerror(errno));
 126         return -1;
 127     }
 128
 129     chunk.memblock = c->playback.current_memblock;
 130     chunk.index = c->playback.memblock_index;
 131     chunk.length = r;
 132     assert(chunk.memblock);
 133
 134     c->playback.memblock_index += r;
 135
 136     assert(c->input_memblockq);
 137     pa_memblockq_push_align(c->input_memblockq, &chunk, 0);
 138     assert(c->sink_input);
 139     pa_sink_notify(c->sink_input->sink);
 140
 141     return 0;
 142 }
 143
 144 static int do_write(struct connection *c) {
 145     struct pa_memchunk chunk;
 146     ssize_t r;
 147
 148     if (!c->source_output)
 149         return 0;
 150
 151     assert(c->output_memblockq);
 152     if (pa_memblockq_peek(c->output_memblockq, &chunk) < 0)
 153         return 0;
 154
 155     assert(chunk.memblock && chunk.length);
 156
 157     if ((r = pa_iochannel_write(c->io, (uint8_t*) chunk.memblock->data+chunk.index, chunk.length)) < 0) {
 158         pa_memblock_unref(chunk.memblock);
 159         pa_log(__FILE__": write(): %s\n", strerror(errno));
 160         return -1;
 161     }
 162
 163     pa_memblockq_drop(c->output_memblockq, &chunk, r);
 164     pa_memblock_unref(chunk.memblock);
 165
 166     return 0;
 167 }
 168
 169
 170 static void do_work(struct connection *c) {
 171     assert(c);
 172
 173     assert(c->protocol && c->protocol->core && c->protocol->core->mainloop && c->protocol->core->mainloop->defer_enable);
 174     c->protocol->core->mainloop->defer_enable(c->defer_event, 0);
 175
 176     if (pa_iochannel_is_hungup(c->io))
 177         goto fail;
 178
 179     if (pa_iochannel_is_writable(c->io))
 180         if (do_write(c) < 0)
 181             goto fail;
 182
 183     if (pa_iochannel_is_readable(c->io))
 184         if (do_read(c) < 0)
 185             goto fail;
 186
 187     return;
 188
 189 fail:
 190     connection_free(c);
 191 }
 192
 193 /*** sink_input callbacks ***/
 194
 195 static int sink_input_peek_cb(struct pa_sink_input *i, struct pa_memchunk *chunk) {
 196     struct connection*c;
 197     assert(i && i->userdata && chunk);
 198     c = i->userdata;
 199
 200     if (pa_memblockq_peek(c->input_memblockq, chunk) < 0)
 201         return -1;
 202
 203     return 0;
 204 }
 205
 206 static void sink_input_drop_cb(struct pa_sink_input *i, const struct pa_memchunk *chunk, size_t length) {
 207     struct connection*c = i->userdata;
 208     assert(i && c && length);
 209
 210     pa_memblockq_drop(c->input_memblockq, chunk, length);
 211
 212     /* do something */
 213     assert(c->protocol && c->protocol->core && c->protocol->core->mainloop && c->protocol->core->mainloop->defer_enable);
 214     c->protocol->core->mainloop->defer_enable(c->defer_event, 1);
 215 }
 216
 217 static void sink_input_kill_cb(struct pa_sink_input *i) {
 218     assert(i && i->userdata);
 219     connection_free((struct connection *) i->userdata);
 220 }
 221
 222
 223 static pa_usec_t sink_input_get_latency_cb(struct pa_sink_input *i) {
 224     struct connection*c = i->userdata;
 225     assert(i && c);
 226     return pa_bytes_to_usec(pa_memblockq_get_length(c->input_memblockq), &c->sink_input->sample_spec);
 227 }
 228
 229 /*** source_output callbacks ***/
 230
 231 static void source_output_push_cb(struct pa_source_output *o, const struct pa_memchunk *chunk) {
 232     struct connection *c = o->userdata;
 233     assert(o && c && chunk);
 234
 235     pa_memblockq_push(c->output_memblockq, chunk, 0);
 236
 237     /* do something */
 238     assert(c->protocol && c->protocol->core && c->protocol->core->mainloop && c->protocol->core->mainloop->defer_enable);
 239     c->protocol->core->mainloop->defer_enable(c->defer_event, 1);
 240 }
 241
 242 static void source_output_kill_cb(struct pa_source_output *o) {
 243     assert(o && o->userdata);
 244     connection_free((struct connection *) o->userdata);
 245 }
 246
 247 /*** client callbacks ***/
 248
 249 static void client_kill_cb(struct pa_client *c) {
 250     assert(c && c->userdata);
 251     connection_free((struct connection *) c->userdata);
 252 }
 253
 254 /*** pa_iochannel callbacks ***/
 255
 256 static void io_callback(struct pa_iochannel*io, void *userdata) {
 257     struct connection *c = userdata;
 258     assert(io && c && c->io == io);
 259
 260     do_work(c);
 261 }
 262
 263 /*** fixed callback ***/
 264
 265 static void defer_callback(struct pa_mainloop_api*a, struct pa_defer_event *e, void *userdata) {
 266     struct connection *c = userdata;
 267     assert(a && c && c->defer_event == e);
 268
 269     do_work(c);
 270 }
 271
 272 /*** socket_server callbacks ***/
 273
 274 static void on_connection(struct pa_socket_server*s, struct pa_iochannel *io, void *userdata) {
 275     struct pa_protocol_simple *p = userdata;
 276     struct connection *c = NULL;
 277     char cname[256];
 278     assert(s && io && p);
 279
 280     c = pa_xmalloc(sizeof(struct connection));
 281     c->io = io;
 282     c->sink_input = NULL;
 283     c->source_output = NULL;
 284     c->defer_event = NULL;
 285     c->input_memblockq = c->output_memblockq = NULL;
 286     c->protocol = p;
 287     c->playback.current_memblock = NULL;
 288     c->playback.memblock_index = 0;
 289     c->playback.fragment_size = 0;
 290
 291     pa_iochannel_socket_peer_to_string(io, cname, sizeof(cname));
 292     c->client = pa_client_new(p->core, "SIMPLE", cname);
 293     assert(c->client);
 294     c->client->owner = p->module;
 295     c->client->kill = client_kill_cb;
 296     c->client->userdata = c;
 297
 298     if (p->mode & PLAYBACK) {
 299         struct pa_sink *sink;
 300         size_t l;
 301
 302         if (!(sink = pa_namereg_get(p->core, p->sink_name, PA_NAMEREG_SINK, 1))) {
 303             pa_log(__FILE__": Failed to get sink.\n");
 304             goto fail;
 305         }
 306
 307         if (!(c->sink_input = pa_sink_input_new(sink, c->client->name, &p->sample_spec, 0))) {
 308             pa_log(__FILE__": Failed to create sink input.\n");
 309             goto fail;
 310         }
 311
 312         c->sink_input->owner = p->module;
 313         c->sink_input->client = c->client;
 314
 315         c->sink_input->peek = sink_input_peek_cb;
 316         c->sink_input->drop = sink_input_drop_cb;
 317         c->sink_input->kill = sink_input_kill_cb;
 318         c->sink_input->get_latency = sink_input_get_latency_cb;
 319         c->sink_input->userdata = c;
 320
 321         l = (size_t) (pa_bytes_per_second(&p->sample_spec)*PLAYBACK_BUFFER_SECONDS);
 322         c->input_memblockq = pa_memblockq_new(l, 0, pa_frame_size(&p->sample_spec), l/2, l/PLAYBACK_BUFFER_FRAGMENTS, p->core->memblock_stat);
 323         assert(c->input_memblockq);
 324         pa_iochannel_socket_set_rcvbuf(io, l/PLAYBACK_BUFFER_FRAGMENTS*5);
 325         c->playback.fragment_size = l/10;
 326     }
 327
 328     if (p->mode & RECORD) {
 329         struct pa_source *source;
 330         size_t l;
 331
 332         if (!(source = pa_namereg_get(p->core, p->source_name, PA_NAMEREG_SOURCE, 1))) {
 333             pa_log(__FILE__": Failed to get source.\n");
 334             goto fail;
 335         }
 336
 337         c->source_output = pa_source_output_new(source, c->client->name, &p->sample_spec);
 338         if (!c->source_output) {
 339             pa_log(__FILE__": Failed to create source output.\n");
 340             goto fail;
 341         }
 342         c->source_output->owner = p->module;
 343         c->source_output->client = c->client;
 344
 345         c->source_output->push = source_output_push_cb;
 346         c->source_output->kill = source_output_kill_cb;
 347         c->source_output->userdata = c;
 348
 349         l = (size_t) (pa_bytes_per_second(&p->sample_spec)*RECORD_BUFFER_SECONDS);
 350         c->output_memblockq = pa_memblockq_new(l, 0, pa_frame_size(&p->sample_spec), 0, 0, p->core->memblock_stat);
 351         pa_iochannel_socket_set_sndbuf(io, l/RECORD_BUFFER_FRAGMENTS*2);
 352     }
 353
 354     pa_iochannel_set_callback(c->io, io_callback, c);
 355     pa_idxset_put(p->connections, c, NULL);
 356
 357     c->defer_event = p->core->mainloop->defer_new(p->core->mainloop, defer_callback, c);
 358     assert(c->defer_event);
 359     p->core->mainloop->defer_enable(c->defer_event, 0);
 360
 361     return;
 362
 363 fail:
 364     if (c)
 365         connection_free(c);
 366 }
 367
 368 struct pa_protocol_simple* pa_protocol_simple_new(struct pa_core *core, struct pa_socket_server *server, struct pa_module *m, struct pa_modargs *ma) {
 369     struct pa_protocol_simple* p = NULL;
 370     int enable;
 371     assert(core && server && ma);
 372
 373     p = pa_xmalloc0(sizeof(struct pa_protocol_simple));
 374     p->module = m;
 375     p->core = core;
 376     p->server = server;
 377     p->connections = pa_idxset_new(NULL, NULL);
 378
 379     p->sample_spec = core->default_sample_spec;
 380     if (pa_modargs_get_sample_spec(ma, &p->sample_spec) < 0) {
 381         pa_log(__FILE__": Failed to parse sample type specification.\n");
 382         goto fail;
 383     }
 384
 385     p->source_name = pa_xstrdup(pa_modargs_get_value(ma, "source", NULL));
 386     p->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));
 387
 388     enable = 0;
 389     if (pa_modargs_get_value_boolean(ma, "record", &enable) < 0) {
 390         pa_log(__FILE__": record= expects a numeric argument.\n");
 391         goto fail;
 392     }
 393     p->mode = enable ? RECORD : 0;
 394
 395     enable = 1;
 396     if (pa_modargs_get_value_boolean(ma, "playback", &enable) < 0) {
 397         pa_log(__FILE__": playback= expects a numeric argument.\n");
 398         goto fail;
 399     }
 400     p->mode |= enable ? PLAYBACK : 0;
 401
 402     if ((p->mode & (RECORD|PLAYBACK)) == 0) {
 403         pa_log(__FILE__": neither playback nor recording enabled for protocol.\n");
 404         goto fail;
 405     }
 406
 407     pa_socket_server_set_callback(p->server, on_connection, p);
 408
 409     return p;
 410
 411 fail:
 412     if (p)
 413         pa_protocol_simple_free(p);
 414     return NULL;
 415 }
 416
 417
 418 void pa_protocol_simple_free(struct pa_protocol_simple *p) {
 419     struct connection *c;
 420     assert(p);
 421
 422     if (p->connections) {
 423         while((c = pa_idxset_first(p->connections, NULL)))
 424             connection_free(c);
 425
 426         pa_idxset_free(p->connections, NULL, NULL);
 427     }
 428
 429     if (p->server)
 430         pa_socket_server_unref(p->server);
 431     pa_xfree(p);
 432 }
 433