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 "polyp.h"
  10 #include "polyp-error.h"
  11 #include "mainloop.h"
  12 #include "mainloop-signal.h"
  13
  14 static struct pa_context *context = NULL;
  15 static struct pa_stream *stream = NULL;
  16 static struct pa_mainloop_api *mainloop_api = NULL;
  17
  18 static void *buffer = NULL;
  19 static size_t buffer_length = 0, buffer_index = 0;
  20
  21 static void* stdin_source = NULL;
  22
  23 static void quit(int ret) {
  24     assert(mainloop_api);
  25     mainloop_api->quit(mainloop_api, ret);
  26 }
  27
  28 static void context_die_callback(struct pa_context *c, void *userdata) {
  29     assert(c);
  30     fprintf(stderr, "Connection to server shut down, exiting.\n");
  31     quit(1);
  32 }
  33
  34 static void stream_die_callback(struct pa_stream *s, void *userdata) {
  35     assert(s);
  36     fprintf(stderr, "Stream deleted, exiting.\n");
  37     quit(1);
  38 }
  39
  40 static void do_write(size_t length) {
  41     size_t l;
  42     assert(length);
  43
  44     if (!buffer || !buffer_length)
  45         return;
  46
  47     l = length;
  48     if (l > buffer_length)
  49         l = buffer_length;
  50
  51     pa_stream_write(stream, buffer+buffer_index, l);
  52     buffer_length -= l;
  53     buffer_index += l;
  54
  55     if (!buffer_length) {
  56         free(buffer);
  57         buffer = NULL;
  58         buffer_index = buffer_length = 0;
  59     }
  60 }
  61
  62 static void stream_write_callback(struct pa_stream *s, size_t length, void *userdata) {
  63     assert(s && length);
  64
  65     if (stdin_source)
  66         mainloop_api->enable_io(mainloop_api, stdin_source, PA_MAINLOOP_API_IO_EVENT_INPUT);
  67
  68     if (!buffer)
  69         return;
  70
  71     do_write(length);
  72 }
  73
  74 static void stream_complete_callback(struct pa_stream*s, int success, void *userdata) {
  75     assert(s);
  76
  77     if (!success) {
  78         fprintf(stderr, "Stream creation failed: %s\n", pa_strerror(pa_context_errno(pa_stream_get_context(s))));
  79         quit(1);
  80         return;
  81     }
  82
  83     fprintf(stderr, "Stream created.\n");
  84 }
  85
  86 static void context_complete_callback(struct pa_context *c, int success, void *userdata) {
  87     static const struct pa_sample_spec ss = {
  88         .format = PA_SAMPLE_S16LE,
  89         .rate = 44100,
  90         .channels = 2
  91     };
  92
  93     assert(c && !stream);
  94
  95     if (!success) {
  96         fprintf(stderr, "Connection failed: %s\n", pa_strerror(pa_context_errno(c)));
  97         goto fail;
  98     }
  99
 100     fprintf(stderr, "Connection established.\n");
 101
 102     if (!(stream = pa_stream_new(c, PA_STREAM_PLAYBACK, NULL, "pacat", &ss, NULL, stream_complete_callback, NULL))) {
 103         fprintf(stderr, "pa_stream_new() failed: %s\n", pa_strerror(pa_context_errno(c)));
 104         goto fail;
 105     }
 106
 107     pa_stream_set_die_callback(stream, stream_die_callback, NULL);
 108     pa_stream_set_write_callback(stream, stream_write_callback, NULL);
 109
 110     return;
 111
 112 fail:
 113     quit(1);
 114 }
 115
 116 static void context_drain_complete(struct pa_context*c, void *userdata) {
 117     quit(0);
 118 }
 119
 120 static void stdin_callback(struct pa_mainloop_api*a, void *id, int fd, enum pa_mainloop_api_io_events events, void *userdata) {
 121     size_t l, w = 0;
 122     ssize_t r;
 123     assert(a == mainloop_api && id && fd == STDIN_FILENO && events == PA_MAINLOOP_API_IO_EVENT_INPUT && stdin_source == id);
 124
 125     if (buffer) {
 126         mainloop_api->enable_io(mainloop_api, stdin_source, PA_MAINLOOP_API_IO_EVENT_NULL);
 127         return;
 128     }
 129
 130     if (!stream || !pa_stream_is_ready(stream) || !(l = w = pa_stream_writable_size(stream)))
 131         l = 4096;
 132
 133     buffer = malloc(l);
 134     assert(buffer);
 135     if ((r = read(fd, buffer, l)) <= 0) {
 136         if (r == 0) {
 137             fprintf(stderr, "Got EOF.\n");
 138             if (pa_context_drain(context, context_drain_complete, NULL) < 0)
 139                 quit(0);
 140             else
 141                 fprintf(stderr, "Draining connection to server.\n");
 142         } else {
 143             fprintf(stderr, "read() failed: %s\n", strerror(errno));
 144             quit(1);
 145         }
 146
 147         mainloop_api->cancel_io(mainloop_api, stdin_source);
 148         stdin_source = NULL;
 149         return;
 150     }
 151
 152     buffer_length = r;
 153     buffer_index = 0;
 154
 155     if (w)
 156         do_write(w);
 157 }
 158
 159
 160 static void exit_signal_callback(void *id, int sig, void *userdata) {
 161     fprintf(stderr, "Got SIGINT, exiting.\n");
 162     quit(0);
 163 }
 164
 165 int main(int argc, char *argv[]) {
 166     struct pa_mainloop* m;
 167     int ret = 1, r;
 168
 169     if (!(m = pa_mainloop_new())) {
 170         fprintf(stderr, "pa_mainloop_new() failed.\n");
 171         goto quit;
 172     }
 173
 174     mainloop_api = pa_mainloop_get_api(m);
 175
 176     r = pa_signal_init(mainloop_api);
 177     assert(r == 0);
 178     pa_signal_register(SIGINT, exit_signal_callback, NULL);
 179     signal(SIGPIPE, SIG_IGN);
 180
 181     if (!(stdin_source = mainloop_api->source_io(mainloop_api, STDIN_FILENO, PA_MAINLOOP_API_IO_EVENT_INPUT, stdin_callback, NULL))) {
 182         fprintf(stderr, "source_io() failed.\n");
 183         goto quit;
 184     }
 185
 186     if (!(context = pa_context_new(mainloop_api, argv[0]))) {
 187         fprintf(stderr, "pa_context_new() failed.\n");
 188         goto quit;
 189     }
 190
 191     if (pa_context_connect(context, NULL, context_complete_callback, NULL) < 0) {
 192         fprintf(stderr, "pa_context_connext() failed.\n");
 193         goto quit;
 194     }
 195
 196     pa_context_set_die_callback(context, context_die_callback, NULL);
 197
 198     if (pa_mainloop_run(m, &ret) < 0) {
 199         fprintf(stderr, "pa_mainloop_run() failed.\n");
 200         goto quit;
 201     }
 202
 203 quit:
 204     if (stream)
 205         pa_stream_free(stream);
 206     if (context)
 207         pa_context_free(context);
 208     if (m)
 209         pa_mainloop_free(m);
 210     if (buffer)
 211         free(buffer);
 212
 213     return ret;
 214 }