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

   1 #include <signal.h>
   2 #include <string.h>
   3 #include <errno.h>
   4 #include <unistd.h>
   5 #include <assert.h>
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8
   9 #include "polyplib.h"
  10 #include "polyplib-error.h"
  11 #include "mainloop.h"
  12 #include "mainloop-signal.h"
  13
  14 static enum { RECORD, PLAYBACK } mode = PLAYBACK;
  15
  16 static struct pa_context *context = NULL;
  17 static struct pa_stream *stream = NULL;
  18 static struct pa_mainloop_api *mainloop_api = NULL;
  19
  20 static void *buffer = NULL;
  21 static size_t buffer_length = 0, buffer_index = 0;
  22
  23 static void* stdio_source = NULL;
  24
  25 static void quit(int ret) {
  26     assert(mainloop_api);
  27     mainloop_api->quit(mainloop_api, ret);
  28 }
  29
  30 static void context_die_callback(struct pa_context *c, void *userdata) {
  31     assert(c);
  32     fprintf(stderr, "Connection to server shut down, exiting.\n");
  33     quit(1);
  34 }
  35
  36 static void stream_die_callback(struct pa_stream *s, void *userdata) {
  37     assert(s);
  38     fprintf(stderr, "Stream deleted, exiting.\n");
  39     quit(1);
  40 }
  41
  42 static void do_stream_write(size_t length) {
  43     size_t l;
  44     assert(length);
  45
  46     if (!buffer || !buffer_length)
  47         return;
  48
  49     l = length;
  50     if (l > buffer_length)
  51         l = buffer_length;
  52
  53     pa_stream_write(stream, buffer+buffer_index, l);
  54     buffer_length -= l;
  55     buffer_index += l;
  56
  57     if (!buffer_length) {
  58         free(buffer);
  59         buffer = NULL;
  60         buffer_index = buffer_length = 0;
  61     }
  62 }
  63
  64 static void stream_write_callback(struct pa_stream *s, size_t length, void *userdata) {
  65     assert(s && length);
  66
  67     if (stdio_source)
  68         mainloop_api->enable_io(mainloop_api, stdio_source, PA_MAINLOOP_API_IO_EVENT_INPUT);
  69
  70     if (!buffer)
  71         return;
  72
  73     do_stream_write(length);
  74 }
  75
  76 static void stream_read_callback(struct pa_stream *s, const void*data, size_t length, void *userdata) {
  77     assert(s && data && length);
  78
  79     if (stdio_source)
  80         mainloop_api->enable_io(mainloop_api, stdio_source, PA_MAINLOOP_API_IO_EVENT_OUTPUT);
  81
  82     if (buffer) {
  83         fprintf(stderr, "Buffer overrrun, dropping incoming data\n");
  84         return;
  85     }
  86
  87     buffer = malloc(buffer_length = length);
  88     assert(buffer);
  89     memcpy(buffer, data, length);
  90     buffer_index = 0;
  91 }
  92
  93 static void stream_complete_callback(struct pa_stream*s, int success, void *userdata) {
  94     assert(s);
  95
  96     if (!success) {
  97         fprintf(stderr, "Stream creation failed: %s\n", pa_strerror(pa_context_errno(pa_stream_get_context(s))));
  98         quit(1);
  99         return;
 100     }
 101
 102     fprintf(stderr, "Stream created.\n");
 103 }
 104
 105 static void context_complete_callback(struct pa_context *c, int success, void *userdata) {
 106     static const struct pa_sample_spec ss = {
 107         .format = PA_SAMPLE_S16LE,
 108         .rate = 44100,
 109         .channels = 2
 110     };
 111
 112     assert(c && !stream);
 113
 114     if (!success) {
 115         fprintf(stderr, "Connection failed: %s\n", pa_strerror(pa_context_errno(c)));
 116         goto fail;
 117     }
 118
 119     fprintf(stderr, "Connection established.\n");
 120
 121     if (!(stream = pa_stream_new(c, mode == PLAYBACK ? PA_STREAM_PLAYBACK : PA_STREAM_RECORD, NULL, "pacat", &ss, NULL, stream_complete_callback, NULL))) {
 122         fprintf(stderr, "pa_stream_new() failed: %s\n", pa_strerror(pa_context_errno(c)));
 123         goto fail;
 124     }
 125
 126     pa_stream_set_die_callback(stream, stream_die_callback, NULL);
 127     pa_stream_set_write_callback(stream, stream_write_callback, NULL);
 128     pa_stream_set_read_callback(stream, stream_read_callback, NULL);
 129
 130     return;
 131
 132 fail:
 133     quit(1);
 134 }
 135
 136 static void context_drain_complete(struct pa_context*c, void *userdata) {
 137     quit(0);
 138 }
 139
 140 static void stream_drain_complete(struct pa_stream*s, void *userdata) {
 141     fprintf(stderr, "Playback stream drained.\n");
 142
 143     pa_stream_free(stream);
 144     stream = NULL;
 145
 146     if (pa_context_drain(context, context_drain_complete, NULL) < 0)
 147         quit(0);
 148     else
 149         fprintf(stderr, "Draining connection to server.\n");
 150 }
 151
 152 static void stdin_callback(struct pa_mainloop_api*a, void *id, int fd, enum pa_mainloop_api_io_events events, void *userdata) {
 153     size_t l, w = 0;
 154     ssize_t r;
 155     assert(a == mainloop_api && id && stdio_source == id);
 156
 157     if (buffer) {
 158         mainloop_api->enable_io(mainloop_api, stdio_source, PA_MAINLOOP_API_IO_EVENT_NULL);
 159         return;
 160     }
 161
 162     if (!stream || !pa_stream_is_ready(stream) || !(l = w = pa_stream_writable_size(stream)))
 163         l = 4096;
 164
 165     buffer = malloc(l);
 166     assert(buffer);
 167     if ((r = read(fd, buffer, l)) <= 0) {
 168         if (r == 0) {
 169             fprintf(stderr, "Got EOF.\n");
 170             pa_stream_drain(stream, stream_drain_complete, NULL);
 171         } else {
 172             fprintf(stderr, "read() failed: %s\n", strerror(errno));
 173             quit(1);
 174         }
 175
 176         mainloop_api->cancel_io(mainloop_api, stdio_source);
 177         stdio_source = NULL;
 178         return;
 179     }
 180
 181     buffer_length = r;
 182     buffer_index = 0;
 183
 184     if (w)
 185         do_stream_write(w);
 186 }
 187
 188 static void stdout_callback(struct pa_mainloop_api*a, void *id, int fd, enum pa_mainloop_api_io_events events, void *userdata) {
 189     ssize_t r;
 190     assert(a == mainloop_api && id && stdio_source == id);
 191
 192     if (!buffer) {
 193         mainloop_api->enable_io(mainloop_api, stdio_source, PA_MAINLOOP_API_IO_EVENT_NULL);
 194         return;
 195     }
 196
 197     assert(buffer_length);
 198
 199     if ((r = write(fd, buffer+buffer_index, buffer_length)) <= 0) {
 200         fprintf(stderr, "write() failed: %s\n", strerror(errno));
 201         quit(1);
 202
 203         mainloop_api->cancel_io(mainloop_api, stdio_source);
 204         stdio_source = NULL;
 205         return;
 206     }
 207
 208     buffer_length -= r;
 209     buffer_index += r;
 210
 211     if (!buffer_length) {
 212         free(buffer);
 213         buffer = NULL;
 214         buffer_length = buffer_index = 0;
 215     }
 216 }
 217
 218 static void exit_signal_callback(void *id, int sig, void *userdata) {
 219     fprintf(stderr, "Got SIGINT, exiting.\n");
 220     quit(0);
 221
 222 }
 223
 224 static void stream_get_latency_callback(struct pa_stream *s, uint32_t latency, void *userdata) {
 225     assert(s);
 226
 227     if (latency == (uint32_t) -1) {
 228         fprintf(stderr, "Failed to get latency: %s\n", strerror(errno));
 229         quit(1);
 230         return;
 231     }
 232
 233     fprintf(stderr, "Current latency is %u usecs.\n", latency);
 234 }
 235
 236 static void sigusr1_signal_callback(void *id, int sig, void *userdata) {
 237     if (mode == PLAYBACK) {
 238         fprintf(stderr, "Got SIGUSR1, requesting latency.\n");
 239         pa_stream_get_latency(stream, stream_get_latency_callback, NULL);
 240     }
 241 }
 242
 243 int main(int argc, char *argv[]) {
 244     struct pa_mainloop* m = NULL;
 245     int ret = 1, r;
 246     char *bn;
 247
 248     if (!(bn = strrchr(argv[0], '/')))
 249         bn = argv[0];
 250
 251     if (strstr(bn, "rec") || strstr(bn, "mon"))
 252         mode = RECORD;
 253     else if (strstr(bn, "cat") || strstr(bn, "play"))
 254         mode = PLAYBACK;
 255
 256     fprintf(stderr, "Opening a %s stream.\n", mode == RECORD ? "recording" : "playback");
 257
 258     if (!(m = pa_mainloop_new())) {
 259         fprintf(stderr, "pa_mainloop_new() failed.\n");
 260         goto quit;
 261     }
 262
 263     mainloop_api = pa_mainloop_get_api(m);
 264
 265     r = pa_signal_init(mainloop_api);
 266     assert(r == 0);
 267     pa_signal_register(SIGINT, exit_signal_callback, NULL);
 268     pa_signal_register(SIGUSR1, sigusr1_signal_callback, NULL);
 269     signal(SIGPIPE, SIG_IGN);
 270
 271     if (!(stdio_source = mainloop_api->source_io(mainloop_api,
 272                                                  mode == PLAYBACK ? STDIN_FILENO : STDOUT_FILENO,
 273                                                  mode == PLAYBACK ? PA_MAINLOOP_API_IO_EVENT_INPUT : PA_MAINLOOP_API_IO_EVENT_OUTPUT,
 274                                                  mode == PLAYBACK ? stdin_callback : stdout_callback, NULL))) {
 275         fprintf(stderr, "source_io() failed.\n");
 276         goto quit;
 277     }
 278
 279     if (!(context = pa_context_new(mainloop_api, argv[0]))) {
 280         fprintf(stderr, "pa_context_new() failed.\n");
 281         goto quit;
 282     }
 283
 284     if (pa_context_connect(context, NULL, context_complete_callback, NULL) < 0) {
 285         fprintf(stderr, "pa_context_connext() failed.\n");
 286         goto quit;
 287     }
 288
 289     pa_context_set_die_callback(context, context_die_callback, NULL);
 290
 291     if (pa_mainloop_run(m, &ret) < 0) {
 292         fprintf(stderr, "pa_mainloop_run() failed.\n");
 293         goto quit;
 294     }
 295
 296 quit:
 297     if (stream)
 298         pa_stream_free(stream);
 299     if (context)
 300         pa_context_free(context);
 301
 302     if (m) {
 303         pa_signal_done();
 304         pa_mainloop_free(m);
 305     }
 306
 307     if (buffer)
 308         free(buffer);
 309
 310     return ret;
 311 }