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

   1 #include <string.h>
   2 #include <errno.h>
   3 #include <unistd.h>
   4 #include <assert.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7
   8 #include "polyp.h"
   9 #include "mainloop.h"
  10
  11 static struct pa_context *context = NULL;
  12 static struct pa_stream *stream = NULL;
  13 static struct pa_mainloop_api *mainloop_api = NULL;
  14
  15 static void *buffer = NULL;
  16 static size_t buffer_length = 0, buffer_index = 0;
  17
  18 static void* stdin_source = NULL;
  19
  20 static void context_die_callback(struct pa_context *c, void *userdata) {
  21     assert(c);
  22     fprintf(stderr, "Connection to server shut down, exiting.\n");
  23     mainloop_api->quit(mainloop_api, 1);
  24 }
  25
  26 static void stream_die_callback(struct pa_stream *s, void *userdata) {
  27     assert(s);
  28     fprintf(stderr, "Stream deleted, exiting.\n");
  29     mainloop_api->quit(mainloop_api, 1);
  30 }
  31
  32 static void do_write(size_t length) {
  33     size_t l;
  34     assert(buffer && buffer_length);
  35
  36     l = length;
  37     if (l > buffer_length)
  38         l = buffer_length;
  39
  40     pa_stream_write(stream, buffer+buffer_index, l);
  41     buffer_length -= l;
  42     buffer_index += l;
  43
  44     if (!buffer_length) {
  45         free(buffer);
  46         buffer = NULL;
  47         buffer_index = buffer_length = 0;
  48     }
  49 }
  50
  51 static void stream_write_callback(struct pa_stream *s, size_t length, void *userdata) {
  52     assert(s && length);
  53
  54     mainloop_api->enable_io(mainloop_api, stdin_source, PA_MAINLOOP_API_IO_EVENT_INPUT);
  55
  56     if (!buffer)
  57         return;
  58
  59     do_write(length);
  60 }
  61
  62 static void stream_complete_callback(struct pa_context*c, struct pa_stream *s, void *userdata) {
  63     assert(c);
  64
  65     if (!s) {
  66         fprintf(stderr, "Stream creation failed.\n");
  67         mainloop_api->quit(mainloop_api, 1);
  68         return;
  69     }
  70
  71     stream = s;
  72     pa_stream_set_die_callback(stream, stream_die_callback, NULL);
  73     pa_stream_set_write_callback(stream, stream_write_callback, NULL);
  74 }
  75
  76 static void context_complete_callback(struct pa_context *c, int success, void *userdata) {
  77     static const struct pa_sample_spec ss = {
  78         .format = PA_SAMPLE_S16NE,
  79         .rate = 44100,
  80         .channels = 2
  81     };
  82
  83     assert(c && !stream);
  84
  85     if (!success) {
  86         fprintf(stderr, "Connection failed\n");
  87         goto fail;
  88     }
  89
  90     if (pa_stream_new(c, PA_STREAM_PLAYBACK, NULL, "pacat", &ss, NULL, stream_complete_callback, NULL) < 0) {
  91         fprintf(stderr, "pa_stream_new() failed.\n");
  92         goto fail;
  93     }
  94
  95     return;
  96
  97 fail:
  98     mainloop_api->quit(mainloop_api, 1);
  99 }
 100
 101 static void stdin_callback(struct pa_mainloop_api*a, void *id, int fd, enum pa_mainloop_api_io_events events, void *userdata) {
 102     size_t l, w = 0;
 103     ssize_t r;
 104     assert(a == mainloop_api && id && fd == STDIN_FILENO && events == PA_MAINLOOP_API_IO_EVENT_INPUT);
 105
 106     if (buffer) {
 107         mainloop_api->enable_io(mainloop_api, stdin_source, PA_MAINLOOP_API_IO_EVENT_NULL);
 108         return;
 109     }
 110
 111     if (!stream || !(l = w = pa_stream_writable_size(stream)))
 112         l = 4096;
 113     buffer = malloc(l);
 114     assert(buffer);
 115     if ((r = read(fd, buffer, l)) <= 0) {
 116         if (r == 0)
 117             mainloop_api->quit(mainloop_api, 0);
 118         else {
 119             fprintf(stderr, "read() failed: %s\n", strerror(errno));
 120             mainloop_api->quit(mainloop_api, 1);
 121         }
 122
 123         return;
 124     }
 125
 126     buffer_length = r;
 127     buffer_index = 0;
 128
 129     if (w)
 130         do_write(w);
 131 }
 132
 133 int main(int argc, char *argv[]) {
 134     struct pa_mainloop* m;
 135     int ret = 1;
 136
 137     if (!(m = pa_mainloop_new())) {
 138         fprintf(stderr, "pa_mainloop_new() failed.\n");
 139         goto quit;
 140     }
 141
 142     mainloop_api = pa_mainloop_get_api(m);
 143
 144     if (!(stdin_source = mainloop_api->source_io(mainloop_api, STDIN_FILENO, PA_MAINLOOP_API_IO_EVENT_INPUT, stdin_callback, NULL))) {
 145         fprintf(stderr, "source_io() failed.\n");
 146         goto quit;
 147     }
 148
 149     if (!(context = pa_context_new(mainloop_api, argv[0]))) {
 150         fprintf(stderr, "pa_context_new() failed.\n");
 151         goto quit;
 152     }
 153
 154     if (pa_context_connect(context, NULL, context_complete_callback, NULL) < 0) {
 155         fprintf(stderr, "pa_context_connext() failed.\n");
 156         goto quit;
 157     }
 158
 159     pa_context_set_die_callback(context, context_die_callback, NULL);
 160
 161     if (pa_mainloop_run(m, &ret) < 0) {
 162         fprintf(stderr, "pa_mainloop_run() failed.\n");
 163         goto quit;
 164     }
 165
 166 quit:
 167     if (stream)
 168         pa_stream_free(stream);
 169     if (context)
 170         pa_context_free(context);
 171     if (m)
 172         pa_mainloop_free(m);
 173     if (buffer)
 174         free(buffer);
 175
 176     return ret;
 177 }