code.delx.au - pulseaudio/blob - polyp/polyplib-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 <stdio.h>
  27 #include <string.h>
  28 #include <assert.h>
  29 #include <stdlib.h>
  30
  31 #include "polyplib-simple.h"
  32 #include "polyplib.h"
  33 #include "mainloop.h"
  34 #include "native-common.h"
  35 #include "xmalloc.h"
  36 #include "log.h"
  37
  38 struct pa_simple {
  39     struct pa_mainloop *mainloop;
  40     struct pa_context *context;
  41     struct pa_stream *stream;
  42     enum pa_stream_direction direction;
  43
  44     int dead;
  45
  46     void *read_data;
  47     size_t read_index, read_length;
  48     pa_usec_t latency;
  49 };
  50
  51 static void read_callback(struct pa_stream *s, const void*data, size_t length, void *userdata);
  52
  53 static int check_error(struct pa_simple *p, int *perror) {
  54     enum pa_context_state cst;
  55     enum pa_stream_state 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 (perror)
  74         *perror = pa_context_errno(p->context);
  75
  76     p->dead = 1;
  77
  78     return -1;
  79 }
  80
  81 static int iterate(struct pa_simple *p, int block, int *perror) {
  82     assert(p && p->context && p->mainloop);
  83
  84     if (check_error(p, perror) < 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 (perror)
  93                 *perror = PA_ERROR_INTERNAL;
  94             return -1;
  95         }
  96
  97         if (check_error(p, perror) < 0)
  98             return -1;
  99
 100     } while (pa_context_is_pending(p->context));
 101
 102     return 0;
 103 }
 104
 105 struct pa_simple* pa_simple_new(
 106     const char *server,
 107     const char *name,
 108     enum pa_stream_direction dir,
 109     const char *dev,
 110     const char *stream_name,
 111     const struct pa_sample_spec *ss,
 112     const struct pa_buffer_attr *attr,
 113     int *perror) {
 114
 115     struct pa_simple *p;
 116     int error = PA_ERROR_INTERNAL;
 117     assert(ss && (dir == PA_STREAM_PLAYBACK || dir == PA_STREAM_RECORD));
 118
 119     p = pa_xmalloc(sizeof(struct pa_simple));
 120     p->context = NULL;
 121     p->stream = NULL;
 122     p->mainloop = pa_mainloop_new();
 123     assert(p->mainloop);
 124     p->dead = 0;
 125     p->direction = dir;
 126     p->read_data = NULL;
 127     p->read_index = p->read_length = 0;
 128     p->latency = 0;
 129
 130     if (!(p->context = pa_context_new(pa_mainloop_get_api(p->mainloop), name)))
 131         goto fail;
 132
 133     pa_context_connect(p->context, server);
 134
 135     /* Wait until the context is ready */
 136     while (pa_context_get_state(p->context) != PA_CONTEXT_READY) {
 137         if (iterate(p, 1, &error) < 0)
 138             goto fail;
 139     }
 140
 141     if (!(p->stream = pa_stream_new(p->context, stream_name, ss)))
 142         goto fail;
 143
 144     if (dir == PA_STREAM_PLAYBACK)
 145         pa_stream_connect_playback(p->stream, dev, attr);
 146     else
 147         pa_stream_connect_record(p->stream, dev, attr);
 148
 149     /* Wait until the stream is ready */
 150     while (pa_stream_get_state(p->stream) != PA_STREAM_READY) {
 151         if (iterate(p, 1, &error) < 0)
 152             goto fail;
 153     }
 154
 155     pa_stream_set_read_callback(p->stream, read_callback, p);
 156
 157     return p;
 158
 159 fail:
 160     if (perror)
 161         *perror = error;
 162     pa_simple_free(p);
 163     return NULL;
 164 }
 165
 166 void pa_simple_free(struct pa_simple *s) {
 167     assert(s);
 168
 169     pa_xfree(s->read_data);
 170
 171     if (s->stream)
 172         pa_stream_unref(s->stream);
 173
 174     if (s->context)
 175         pa_context_unref(s->context);
 176
 177     if (s->mainloop)
 178         pa_mainloop_free(s->mainloop);
 179
 180     pa_xfree(s);
 181 }
 182
 183 int pa_simple_write(struct pa_simple *p, const void*data, size_t length, int *perror) {
 184     assert(p && data && p->direction == PA_STREAM_PLAYBACK);
 185
 186     if (p->dead) {
 187         if (perror)
 188             *perror = pa_context_errno(p->context);
 189
 190         return -1;
 191     }
 192
 193     while (length > 0) {
 194         size_t l;
 195
 196         while (!(l = pa_stream_writable_size(p->stream)))
 197             if (iterate(p, 1, perror) < 0)
 198                 return -1;
 199
 200         if (l > length)
 201             l = length;
 202
 203         pa_stream_write(p->stream, data, l, NULL, 0);
 204         data = (uint8_t*) data + l;
 205         length -= l;
 206     }
 207
 208     /* Make sure that no data is pending for write */
 209     if (iterate(p, 0, perror) < 0)
 210         return -1;
 211
 212     return 0;
 213 }
 214
 215 static void read_callback(struct pa_stream *s, const void*data, size_t length, void *userdata) {
 216     struct pa_simple *p = userdata;
 217     assert(s && data && length && p);
 218
 219     if (p->read_data) {
 220         pa_log(__FILE__": Buffer overflow, dropping incoming memory blocks.\n");
 221         pa_xfree(p->read_data);
 222     }
 223
 224     p->read_data = pa_xmemdup(data, p->read_length = length);
 225     p->read_index = 0;
 226 }
 227
 228 int pa_simple_read(struct pa_simple *p, void*data, size_t length, int *perror) {
 229     assert(p && data && p->direction == PA_STREAM_RECORD);
 230
 231     if (p->dead) {
 232         if (perror)
 233             *perror = pa_context_errno(p->context);
 234
 235         return -1;
 236     }
 237
 238     while (length > 0) {
 239         if (p->read_data) {
 240             size_t l = length;
 241
 242             if (p->read_length <= l)
 243                 l = p->read_length;
 244
 245             memcpy(data, (uint8_t*) p->read_data+p->read_index, l);
 246
 247             data = (uint8_t*) data + l;
 248             length -= l;
 249
 250             p->read_index += l;
 251             p->read_length -= l;
 252
 253             if (!p->read_length) {
 254                 pa_xfree(p->read_data);
 255                 p->read_data = NULL;
 256                 p->read_index = 0;
 257             }
 258
 259             if (!length)
 260                 return 0;
 261
 262             assert(!p->read_data);
 263         }
 264
 265         if (iterate(p, 1, perror) < 0)
 266             return -1;
 267     }
 268
 269     return 0;
 270 }
 271
 272 static void drain_or_flush_complete(struct pa_stream *s, int success, void *userdata) {
 273     struct pa_simple *p = userdata;
 274     assert(s && p);
 275     if (!success)
 276         p->dead = 1;
 277 }
 278
 279 int pa_simple_drain(struct pa_simple *p, int *perror) {
 280     struct pa_operation *o;
 281     assert(p && p->direction == PA_STREAM_PLAYBACK);
 282
 283     if (p->dead) {
 284         if (perror)
 285             *perror = pa_context_errno(p->context);
 286
 287         return -1;
 288     }
 289
 290     o = pa_stream_drain(p->stream, drain_or_flush_complete, p);
 291
 292     while (pa_operation_get_state(o) == PA_OPERATION_RUNNING) {
 293         if (iterate(p, 1, perror) < 0) {
 294             pa_operation_cancel(o);
 295             pa_operation_unref(o);
 296             return -1;
 297         }
 298     }
 299
 300     pa_operation_unref(o);
 301
 302     if (p->dead && perror)
 303         *perror = pa_context_errno(p->context);
 304
 305     return p->dead ? -1 : 0;
 306 }
 307
 308 static void latency_complete(struct pa_stream *s, const struct pa_latency_info *l, void *userdata) {
 309     struct pa_simple *p = userdata;
 310     assert(s && p);
 311
 312     if (!l)
 313         p->dead = 1;
 314     else
 315         p->latency = l->buffer_usec + l->sink_usec + l->transport_usec;
 316 }
 317
 318 pa_usec_t pa_simple_get_playback_latency(struct pa_simple *p, int *perror) {
 319     struct pa_operation *o;
 320     assert(p && p->direction == PA_STREAM_PLAYBACK);
 321
 322     if (p->dead) {
 323         if (perror)
 324             *perror = pa_context_errno(p->context);
 325
 326         return (pa_usec_t) -1;
 327     }
 328
 329     p->latency = 0;
 330     o = pa_stream_get_latency(p->stream, latency_complete, p);
 331
 332     while (pa_operation_get_state(o) == PA_OPERATION_RUNNING) {
 333
 334         if (iterate(p, 1, perror) < 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 && perror)
 344         *perror = pa_context_errno(p->context);
 345
 346     return p->dead ? (pa_usec_t) -1 : p->latency;
 347 }
 348
 349 int pa_simple_flush(struct pa_simple *p, int *perror) {
 350     struct pa_operation *o;
 351     assert(p && p->direction == PA_STREAM_PLAYBACK);
 352
 353     if (p->dead) {
 354         if (perror)
 355             *perror = pa_context_errno(p->context);
 356
 357         return -1;
 358     }
 359
 360     o = pa_stream_flush(p->stream, drain_or_flush_complete, p);
 361
 362     while (pa_operation_get_state(o) == PA_OPERATION_RUNNING) {
 363         if (iterate(p, 1, perror) < 0) {
 364             pa_operation_cancel(o);
 365             pa_operation_unref(o);
 366             return -1;
 367         }
 368     }
 369
 370     pa_operation_unref(o);
 371
 372     if (p->dead && perror)
 373         *perror = pa_context_errno(p->context);
 374
 375     return p->dead ? -1 : 0;
 376 }