code.delx.au - pulseaudio/blob - src/polyp/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 Lesser 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 Lesser 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 <stdio.h>
  27 #include <string.h>
  28 #include <assert.h>
  29 #include <stdlib.h>
  30
  31 #include <polyp/polypaudio.h>
  32 #include <polyp/mainloop.h>
  33
  34 #include <polypcore/native-common.h>
  35 #include <polypcore/xmalloc.h>
  36 #include <polypcore/log.h>
  37
  38 #include "simple.h"
  39
  40 #define CHECK_VALIDITY_RETURN_ANY(rerror, expression, error, ret) do { \
  41 if (!(expression)) { \
  42     if (rerror) \
  43         *(rerror) = error; \
  44     return ret; \
  45     }  \
  46 } while(0);
  47
  48 struct pa_simple {
  49     pa_mainloop *mainloop;
  50     pa_context *context;
  51     pa_stream *stream;
  52     pa_stream_direction_t direction;
  53
  54     int dead;
  55
  56     const void *read_data;
  57     size_t read_index, read_length;
  58     pa_usec_t latency;
  59 };
  60
  61 static int check_error(pa_simple *p, int *rerror) {
  62     pa_context_state_t cst;
  63     pa_stream_state_t sst;
  64     assert(p);
  65
  66     if ((cst = pa_context_get_state(p->context)) == PA_CONTEXT_FAILED)
  67         goto fail;
  68
  69     assert(cst != PA_CONTEXT_TERMINATED);
  70
  71     if (p->stream) {
  72         if ((sst = pa_stream_get_state(p->stream)) == PA_STREAM_FAILED)
  73             goto fail;
  74
  75         assert(sst != PA_STREAM_TERMINATED);
  76     }
  77
  78     return 0;
  79
  80 fail:
  81     if (rerror)
  82         *rerror = pa_context_errno(p->context);
  83
  84     p->dead = 1;
  85
  86     return -1;
  87 }
  88
  89 static int iterate(pa_simple *p, int block, int *rerror) {
  90     assert(p && p->context && p->mainloop);
  91
  92     if (check_error(p, rerror) < 0)
  93         return -1;
  94
  95     if (block || pa_context_is_pending(p->context)) {
  96         do {
  97             if (pa_mainloop_iterate(p->mainloop, 1, NULL) < 0) {
  98                 if (rerror)
  99                     *rerror = PA_ERR_INTERNAL;
 100                 return -1;
 101             }
 102
 103             if (check_error(p, rerror) < 0)
 104                 return -1;
 105         } while (pa_context_is_pending(p->context));
 106     }
 107
 108     for (;;) {
 109         int r;
 110
 111         if ((r = pa_mainloop_iterate(p->mainloop, 0, NULL)) < 0) {
 112             if (rerror)
 113                 *rerror = PA_ERR_INTERNAL;
 114             return -1;
 115         }
 116
 117         if (r == 0)
 118             break;
 119
 120         if (check_error(p, rerror) < 0)
 121             return -1;
 122     }
 123
 124     return 0;
 125 }
 126
 127 pa_simple* pa_simple_new(
 128     const char *server,
 129     const char *name,
 130     pa_stream_direction_t dir,
 131     const char *dev,
 132     const char *stream_name,
 133     const pa_sample_spec *ss,
 134     const pa_buffer_attr *attr,
 135     int *rerror) {
 136
 137     pa_simple *p;
 138     int error = PA_ERR_INTERNAL, r;
 139
 140     CHECK_VALIDITY_RETURN_ANY(rerror, !server || *server, PA_ERR_INVALID, NULL);
 141     CHECK_VALIDITY_RETURN_ANY(rerror, dir == PA_STREAM_PLAYBACK || dir == PA_STREAM_RECORD, PA_ERR_INVALID, NULL);
 142     CHECK_VALIDITY_RETURN_ANY(rerror, !dev || *dev, PA_ERR_INVALID, NULL);
 143     CHECK_VALIDITY_RETURN_ANY(rerror, ss && pa_sample_spec_valid(ss), PA_ERR_INVALID, NULL);
 144
 145     p = pa_xnew(pa_simple, 1);
 146     p->context = NULL;
 147     p->stream = NULL;
 148     p->mainloop = pa_mainloop_new();
 149     assert(p->mainloop);
 150     p->dead = 0;
 151     p->direction = dir;
 152     p->read_data = NULL;
 153     p->read_index = p->read_length = 0;
 154     p->latency = 0;
 155
 156     if (!(p->context = pa_context_new(pa_mainloop_get_api(p->mainloop), name)))
 157         goto fail;
 158
 159     if (pa_context_connect(p->context, server, 0, NULL) < 0) {
 160         error = pa_context_errno(p->context);
 161         goto fail;
 162     }
 163
 164     /* Wait until the context is ready */
 165     while (pa_context_get_state(p->context) != PA_CONTEXT_READY) {
 166         if (iterate(p, 1, &error) < 0)
 167             goto fail;
 168     }
 169
 170     if (!(p->stream = pa_stream_new(p->context, stream_name, ss, NULL))) {
 171         error = pa_context_errno(p->context);
 172         goto fail;
 173     }
 174
 175     if (dir == PA_STREAM_PLAYBACK)
 176         r = pa_stream_connect_playback(p->stream, dev, attr, 0, NULL, NULL);
 177     else
 178         r = pa_stream_connect_record(p->stream, dev, attr, 0);
 179
 180     if (r < 0) {
 181         error = pa_context_errno(p->context);
 182         goto fail;
 183     }
 184
 185     /* Wait until the stream is ready */
 186     while (pa_stream_get_state(p->stream) != PA_STREAM_READY) {
 187         if (iterate(p, 1, &error) < 0)
 188             goto fail;
 189     }
 190
 191     return p;
 192
 193 fail:
 194     if (rerror)
 195         *rerror = error;
 196     pa_simple_free(p);
 197     return NULL;
 198 }
 199
 200 void pa_simple_free(pa_simple *s) {
 201     assert(s);
 202
 203     if (s->stream)
 204         pa_stream_unref(s->stream);
 205
 206     if (s->context)
 207         pa_context_unref(s->context);
 208
 209     if (s->mainloop)
 210         pa_mainloop_free(s->mainloop);
 211
 212     pa_xfree(s);
 213 }
 214
 215 int pa_simple_write(pa_simple *p, const void*data, size_t length, int *rerror) {
 216     assert(p);
 217     assert(data);
 218
 219     CHECK_VALIDITY_RETURN_ANY(rerror, p->direction == PA_STREAM_PLAYBACK, PA_ERR_BADSTATE, -1);
 220
 221     if (p->dead) {
 222         if (rerror)
 223             *rerror = pa_context_errno(p->context);
 224
 225         return -1;
 226     }
 227
 228     while (length > 0) {
 229         size_t l;
 230
 231         while (!(l = pa_stream_writable_size(p->stream)))
 232             if (iterate(p, 1, rerror) < 0)
 233                 return -1;
 234
 235         if (l > length)
 236             l = length;
 237
 238         pa_stream_write(p->stream, data, l, NULL, 0, PA_SEEK_RELATIVE);
 239         data = (const uint8_t*) data + l;
 240         length -= l;
 241     }
 242
 243     /* Make sure that no data is pending for write */
 244     if (iterate(p, 0, rerror) < 0)
 245         return -1;
 246
 247     return 0;
 248 }
 249
 250 int pa_simple_read(pa_simple *p, void*data, size_t length, int *rerror) {
 251     assert(p);
 252     assert(data);
 253
 254     CHECK_VALIDITY_RETURN_ANY(rerror, p->direction == PA_STREAM_RECORD, PA_ERR_BADSTATE, -1);
 255
 256     if (p->dead) {
 257         if (rerror)
 258             *rerror = pa_context_errno(p->context);
 259
 260         return -1;
 261     }
 262
 263     while (length > 0) {
 264
 265         if (!p->read_data)
 266             if (pa_stream_peek(p->stream, &p->read_data, &p->read_length) >= 0)
 267                 p->read_index = 0;
 268
 269         if (p->read_data) {
 270             size_t l = length;
 271
 272             if (p->read_length <= l)
 273                 l = p->read_length;
 274
 275             memcpy(data, (const uint8_t*) p->read_data+p->read_index, l);
 276
 277             data = (uint8_t*) data + l;
 278             length -= l;
 279
 280             p->read_index += l;
 281             p->read_length -= l;
 282
 283             if (!p->read_length) {
 284                 pa_stream_drop(p->stream);
 285                 p->read_data = NULL;
 286                 p->read_length = 0;
 287                 p->read_index = 0;
 288             }
 289
 290             if (!length)
 291                 return 0;
 292
 293             assert(!p->read_data);
 294         }
 295
 296         if (iterate(p, 1, rerror) < 0)
 297             return -1;
 298     }
 299
 300     return 0;
 301 }
 302
 303 static void drain_or_flush_complete(pa_stream *s, int success, void *userdata) {
 304     pa_simple *p = userdata;
 305
 306     assert(s);
 307     assert(p);
 308
 309     if (!success)
 310         p->dead = 1;
 311 }
 312
 313 int pa_simple_drain(pa_simple *p, int *rerror) {
 314     pa_operation *o;
 315
 316     assert(p);
 317
 318     CHECK_VALIDITY_RETURN_ANY(rerror, p->direction == PA_STREAM_PLAYBACK, PA_ERR_BADSTATE, -1);
 319
 320     if (p->dead) {
 321         if (rerror)
 322             *rerror = pa_context_errno(p->context);
 323
 324         return -1;
 325     }
 326
 327     if (!(o = pa_stream_drain(p->stream, drain_or_flush_complete, p))) {
 328         if (rerror)
 329             *rerror = pa_context_errno(p->context);
 330         return -1;
 331     }
 332
 333     while (pa_operation_get_state(o) == PA_OPERATION_RUNNING) {
 334         if (iterate(p, 1, rerror) < 0) {
 335             pa_operation_cancel(o);
 336             pa_operation_unref(o);
 337             return -1;
 338         }
 339     }
 340
 341     pa_operation_unref(o);
 342
 343     if (p->dead && rerror)
 344         *rerror = pa_context_errno(p->context);
 345
 346     return p->dead ? -1 : 0;
 347 }
 348
 349 static void timing_complete(pa_stream *s, int success, void *userdata) {
 350     pa_simple *p = userdata;
 351
 352     assert(s);
 353     assert(p);
 354
 355     if (!success)
 356         p->dead = 1;
 357     else {
 358         int negative = 0;
 359         if (pa_stream_get_latency(s, &p->latency, &negative) < 0)
 360             p->dead = 1;
 361         else if (negative)
 362             p->latency = 0;
 363     }
 364 }
 365
 366 pa_usec_t pa_simple_get_playback_latency(pa_simple *p, int *rerror) {
 367     pa_operation *o;
 368
 369     assert(p);
 370
 371     CHECK_VALIDITY_RETURN_ANY(rerror, p->direction == PA_STREAM_PLAYBACK, PA_ERR_BADSTATE, -1);
 372
 373     if (p->dead) {
 374         if (rerror)
 375             *rerror = pa_context_errno(p->context);
 376
 377         return (pa_usec_t) -1;
 378     }
 379
 380     p->latency = 0;
 381     if (!(o = pa_stream_update_timing_info(p->stream, timing_complete, p))) {
 382         if (rerror)
 383             *rerror = pa_context_errno(p->context);
 384         return (pa_usec_t) -1;
 385     }
 386
 387     while (pa_operation_get_state(o) == PA_OPERATION_RUNNING) {
 388
 389         if (iterate(p, 1, rerror) < 0) {
 390             pa_operation_cancel(o);
 391             pa_operation_unref(o);
 392             return -1;
 393         }
 394     }
 395
 396     pa_operation_unref(o);
 397
 398     if (p->dead && rerror)
 399         *rerror = pa_context_errno(p->context);
 400
 401     return p->dead ? (pa_usec_t) -1 : p->latency;
 402 }
 403
 404 int pa_simple_flush(pa_simple *p, int *rerror) {
 405     pa_operation *o;
 406
 407     assert(p);
 408
 409     CHECK_VALIDITY_RETURN_ANY(rerror, p->direction == PA_STREAM_PLAYBACK, PA_ERR_BADSTATE, -1);
 410
 411     if (p->dead) {
 412         if (rerror)
 413             *rerror = pa_context_errno(p->context);
 414
 415         return -1;
 416     }
 417
 418     if (!(o = pa_stream_flush(p->stream, drain_or_flush_complete, p))) {
 419         if (rerror)
 420             *rerror = pa_context_errno(p->context);
 421         return -1;
 422     }
 423
 424     while (pa_operation_get_state(o) == PA_OPERATION_RUNNING) {
 425         if (iterate(p, 1, rerror) < 0) {
 426             pa_operation_cancel(o);
 427             pa_operation_unref(o);
 428             return -1;
 429         }
 430     }
 431
 432     pa_operation_unref(o);
 433
 434     if (p->dead && rerror)
 435         *rerror = pa_context_errno(p->context);
 436
 437     return p->dead ? -1 : 0;
 438 }