code.delx.au - pulseaudio/blob - src/simple.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <assert.h>
   4 #include <stdlib.h>
   5
   6 #include "simple.h"
   7 #include "polyp.h"
   8 #include "mainloop.h"
   9 #include "polyp-error.h"
  10
  11 struct pa_simple {
  12     struct pa_mainloop *mainloop;
  13     struct pa_context *context;
  14     struct pa_stream *stream;
  15     enum pa_stream_direction direction;
  16
  17     int dead, drained;
  18
  19     void *read_data;
  20     size_t read_index, read_length;
  21 };
  22
  23 static void read_callback(struct pa_stream *s, const void*data, size_t length, void *userdata);
  24
  25 static int check_error(struct pa_simple *p, int *perror) {
  26     assert(p);
  27
  28     if (pa_context_is_dead(p->context) || (p->stream && pa_stream_is_dead(p->stream))) {
  29         if (perror)
  30             *perror = pa_context_errno(p->context);
  31         return -1;
  32     }
  33
  34     return 0;
  35 }
  36
  37 static int iterate(struct pa_simple *p, int block, int *perror) {
  38     assert(p && p->context && p->mainloop);
  39
  40     if (check_error(p, perror) < 0)
  41         return -1;
  42
  43     if (!block && !pa_context_is_pending(p->context))
  44         return 0;
  45
  46     do {
  47         if (pa_mainloop_iterate(p->mainloop, 1, NULL) < 0) {
  48             if (perror)
  49                 *perror = PA_ERROR_INTERNAL;
  50             return -1;
  51         }
  52
  53         if (check_error(p, perror) < 0)
  54             return -1;
  55
  56     } while (pa_context_is_pending(p->context));
  57
  58     return 0;
  59 }
  60
  61 struct pa_simple* pa_simple_new(
  62     const char *server,
  63     const char *name,
  64     enum pa_stream_direction dir,
  65     const char *dev,
  66     const char *stream_name,
  67     const struct pa_sample_spec *ss,
  68     const struct pa_buffer_attr *attr,
  69     int *perror) {
  70
  71     struct pa_simple *p;
  72     int error = PA_ERROR_INTERNAL;
  73     assert(ss);
  74
  75     p = malloc(sizeof(struct pa_simple));
  76     assert(p);
  77     p->context = NULL;
  78     p->stream = NULL;
  79     p->mainloop = pa_mainloop_new();
  80     assert(p->mainloop);
  81     p->dead = 0;
  82     p->direction = dir;
  83     p->read_data = NULL;
  84     p->read_index = p->read_length = 0;
  85
  86     if (!(p->context = pa_context_new(pa_mainloop_get_api(p->mainloop), name)))
  87         goto fail;
  88
  89     if (pa_context_connect(p->context, server, NULL, NULL) < 0) {
  90         error = pa_context_errno(p->context);
  91         goto fail;
  92     }
  93
  94     /* Wait until the context is ready */
  95     while (!pa_context_is_ready(p->context)) {
  96         if (iterate(p, 1, &error) < 0)
  97             goto fail;
  98     }
  99
 100     if (!(p->stream = pa_stream_new(p->context, dir, dev, stream_name, ss, attr, NULL, NULL)))
 101         goto fail;
 102
 103     /* Wait until the stream is ready */
 104     while (!pa_stream_is_ready(p->stream)) {
 105         if (iterate(p, 1, &error) < 0)
 106             goto fail;
 107     }
 108
 109     pa_stream_set_read_callback(p->stream, read_callback, p);
 110
 111     return p;
 112
 113 fail:
 114     if (perror)
 115         *perror = error;
 116     pa_simple_free(p);
 117     return NULL;
 118 }
 119
 120 void pa_simple_free(struct pa_simple *s) {
 121     assert(s);
 122
 123     free(s->read_data);
 124
 125     if (s->stream)
 126         pa_stream_free(s->stream);
 127
 128     if (s->context)
 129         pa_context_free(s->context);
 130
 131     if (s->mainloop)
 132         pa_mainloop_free(s->mainloop);
 133
 134     free(s);
 135 }
 136
 137 int pa_simple_write(struct pa_simple *p, const void*data, size_t length, int *perror) {
 138     assert(p && data && p->direction == PA_STREAM_PLAYBACK);
 139
 140     while (length > 0) {
 141         size_t l;
 142
 143         while (!(l = pa_stream_writable_size(p->stream)))
 144             if (iterate(p, 1, perror) < 0)
 145                 return -1;
 146
 147         if (l > length)
 148             l = length;
 149
 150         pa_stream_write(p->stream, data, l);
 151         data += l;
 152         length -= l;
 153     }
 154
 155     /* Make sure that no data is pending for write */
 156     if (iterate(p, 0, perror) < 0)
 157         return -1;
 158
 159     return 0;
 160 }
 161
 162 static void read_callback(struct pa_stream *s, const void*data, size_t length, void *userdata) {
 163     struct pa_simple *p = userdata;
 164     assert(s && data && length && p);
 165
 166     if (p->read_data) {
 167         fprintf(stderr, __FILE__": Buffer overflow, dropping incoming memory blocks.\n");
 168         free(p->read_data);
 169     }
 170
 171     p->read_data = malloc(p->read_length = length);
 172     assert(p->read_data);
 173     memcpy(p->read_data, data, length);
 174     p->read_index = 0;
 175 }
 176
 177 int pa_simple_read(struct pa_simple *p, void*data, size_t length, int *perror) {
 178     assert(p && data && p->direction == PA_STREAM_RECORD);
 179
 180     while (length > 0) {
 181         if (p->read_data) {
 182             size_t l = length;
 183
 184             if (p->read_length <= l)
 185                 l = p->read_length;
 186
 187             memcpy(data, p->read_data+p->read_index, l);
 188
 189             data += l;
 190             length -= l;
 191
 192             p->read_index += l;
 193             p->read_length -= l;
 194
 195             if (!p->read_length) {
 196                 free(p->read_data);
 197                 p->read_data = NULL;
 198                 p->read_index = 0;
 199             }
 200
 201             if (!length)
 202                 return 0;
 203
 204             assert(!p->read_data);
 205         }
 206
 207         if (iterate(p, 1, perror) < 0)
 208             return -1;
 209     }
 210
 211     return 0;
 212 }
 213
 214 static void drain_complete(struct pa_stream *s, void *userdata) {
 215     struct pa_simple *p = userdata;
 216     assert(s && p);
 217     p->drained = 1;
 218 }
 219
 220 int pa_simple_drain(struct pa_simple *p, int *perror) {
 221     assert(p && p->direction == PA_STREAM_PLAYBACK);
 222     p->drained = 0;
 223     pa_stream_drain(p->stream, drain_complete, p);
 224
 225     while (!p->drained) {
 226         if (iterate(p, 1, perror) < 0) {
 227             pa_stream_drain(p->stream, NULL, NULL);
 228             return -1;
 229         }
 230     }
 231
 232     return 0;
 233 }