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