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 stream_write_callback(struct pa_stream *s, size_t length, void *userdata) {
  33     size_t l;
  34     assert(s && length);
  35
  36     mainloop_api->enable_io(mainloop_api, stdin_source, PA_STREAM_PLAYBACK);
  37
  38     if (!buffer)
  39         return;
  40
  41     assert(buffer_length);
  42
  43     l = length;
  44     if (l > buffer_length)
  45         l = buffer_length;
  46
  47     pa_stream_write(s, buffer+buffer_index, l);
  48     buffer_length -= l;
  49     buffer_index += l;
  50
  51     if (!buffer_length) {
  52         free(buffer);
  53         buffer = NULL;
  54         buffer_index = buffer_length = 0;
  55     }
  56 }
  57
  58 static void stream_complete_callback(struct pa_context*c, struct pa_stream *s, void *userdata) {
  59     assert(c);
  60
  61     if (!s) {
  62         fprintf(stderr, "Stream creation failed.\n");
  63         mainloop_api->quit(mainloop_api, 1);
  64     }
  65
  66     stream = s;
  67     pa_stream_set_die_callback(stream, stream_die_callback, NULL);
  68     pa_stream_set_write_callback(stream, stream_write_callback, NULL);
  69 }
  70
  71 static void context_complete_callback(struct pa_context *c, int success, void *userdata) {
  72     static const struct pa_sample_spec ss = {
  73         .format = SAMPLE_S16NE,
  74         .rate = 44100,
  75         .channels = 2
  76     };
  77
  78     assert(c && !stream);
  79
  80     if (!success) {
  81         fprintf(stderr, "Connection failed\n");
  82         goto fail;
  83     }
  84
  85     if (pa_stream_new(c, PA_STREAM_PLAYBACK, NULL, "pacat", &ss, NULL, stream_complete_callback, NULL) < 0) {
  86         fprintf(stderr, "pa_stream_new() failed.\n");
  87         goto fail;
  88     }
  89
  90     return;
  91
  92 fail:
  93     mainloop_api->quit(mainloop_api, 1);
  94 }
  95
  96 static void stdin_callback(struct pa_mainloop_api*a, void *id, int fd, enum pa_mainloop_api_io_events events, void *userdata) {
  97     size_t l;
  98     ssize_t r;
  99     assert(a == mainloop_api && id && fd == STDIN_FILENO && events == PA_MAINLOOP_API_IO_EVENT_INPUT);
 100
 101     if (buffer) {
 102         mainloop_api->enable_io(mainloop_api, stdin_source, PA_MAINLOOP_API_IO_EVENT_NULL);
 103         return;
 104     }
 105
 106     if (!(l = pa_stream_writable_size(stream)))
 107         l = 4096;
 108     buffer = malloc(l);
 109     assert(buffer);
 110     if ((r = read(fd, buffer, l)) <= 0) {
 111         if (r == 0)
 112             mainloop_api->quit(mainloop_api, 0);
 113         else {
 114             fprintf(stderr, "read() failed: %s\n", strerror(errno));
 115             mainloop_api->quit(mainloop_api, 1);
 116         }
 117
 118         return;
 119     }
 120
 121     buffer_length = r;
 122     buffer_index = 0;
 123 }
 124
 125 int main(int argc, char *argv[]) {
 126     struct pa_mainloop* m;
 127     int ret = 1;
 128
 129     if (!(m = pa_mainloop_new())) {
 130         fprintf(stderr, "pa_mainloop_new() failed.\n");
 131         goto quit;
 132     }
 133
 134     mainloop_api = pa_mainloop_get_api(m);
 135
 136     if (!(stdin_source = mainloop_api->source_io(mainloop_api, STDIN_FILENO, PA_MAINLOOP_API_IO_EVENT_INPUT, stdin_callback, NULL))) {
 137         fprintf(stderr, "source_io() failed.\n");
 138         goto quit;
 139     }
 140
 141     if (!(context = pa_context_new(mainloop_api, argv[0]))) {
 142         fprintf(stderr, "pa_context_new() failed.\n");
 143         goto quit;
 144     }
 145
 146     if (pa_context_connect(context, NULL, context_complete_callback, NULL) < 0) {
 147         fprintf(stderr, "pa_context_connext() failed.\n");
 148         goto quit;
 149     }
 150
 151     pa_context_set_die_callback(context, context_die_callback, NULL);
 152
 153     if (pa_mainloop_run(m, &ret) < 0) {
 154         fprintf(stderr, "pa_mainloop_run() failed.\n");
 155         goto quit;
 156     }
 157
 158 quit:
 159     if (stream)
 160         pa_stream_free(stream);
 161     if (context)
 162         pa_context_free(context);
 163     if (m)
 164         pa_mainloop_free(m);
 165     if (buffer)
 166         free(buffer);
 167
 168     return ret;
 169 }