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

   1 #include <assert.h>
   2 #include <stdlib.h>
   3 #include <limits.h>
   4 #include <stdio.h>
   5 #include <errno.h>
   6 #include <string.h>
   7
   8 #include "sinkinput.h"
   9 #include "sourceoutput.h"
  10 #include "protocol-simple.h"
  11 #include "client.h"
  12
  13 struct connection {
  14     struct protocol_simple *protocol;
  15     struct iochannel *io;
  16     struct sink_input *sink_input;
  17     struct source_output *source_output;
  18     struct client *client;
  19     struct memblockq *input_memblockq, *output_memblockq;
  20 };
  21
  22 struct protocol_simple {
  23     struct core *core;
  24     struct socket_server*server;
  25     struct idxset *connections;
  26     enum protocol_simple_mode mode;
  27 };
  28
  29 #define BUFSIZE PIPE_BUF
  30
  31 static void free_connection(void *data, void *userdata) {
  32     struct connection *c = data;
  33     assert(data);
  34
  35     if (c->sink_input)
  36         sink_input_free(c->sink_input);
  37     if (c->source_output)
  38         source_output_free(c->source_output);
  39     if (c->client)
  40         client_free(c->client);
  41     if (c->io)
  42         iochannel_free(c->io);
  43     if (c->input_memblockq)
  44         memblockq_free(c->input_memblockq);
  45     if (c->output_memblockq)
  46         memblockq_free(c->output_memblockq);
  47     free(c);
  48 }
  49
  50 static void destroy_connection(struct connection *c) {
  51     assert(c && c->protocol);
  52     idxset_remove_by_data(c->protocol->connections, c, NULL);
  53     free_connection(c, NULL);
  54 }
  55
  56 static int do_read(struct connection *c) {
  57     struct memchunk chunk;
  58     ssize_t r;
  59     uint32_t u1, u2;
  60
  61     if (!iochannel_is_readable(c->io))
  62         return 0;
  63
  64     if (!c->sink_input || !memblockq_is_writable(c->input_memblockq, BUFSIZE))
  65         return 0;
  66
  67     chunk.memblock = memblock_new(BUFSIZE);
  68     assert(chunk.memblock);
  69
  70     if ((r = iochannel_read(c->io, chunk.memblock->data, BUFSIZE)) <= 0) {
  71         fprintf(stderr, "read(): %s\n", r == 0 ? "EOF" : strerror(errno));
  72         memblock_unref(chunk.memblock);
  73         return -1;
  74     }
  75
  76     chunk.memblock->length = r;
  77     chunk.length = r;
  78     chunk.index = 0;
  79
  80     assert(c->input_memblockq);
  81     memblockq_push(c->input_memblockq, &chunk, 0);
  82     memblock_unref(chunk.memblock);
  83     sink_notify(c->sink_input->sink);
  84
  85
  86     u1 = memblockq_get_latency(c->input_memblockq);
  87     u2 = sink_get_latency(c->sink_input->sink);
  88
  89     fprintf(stderr, "latency: %u+%u=%u\r", u1, u2, u1+u2);
  90
  91     return 0;
  92 }
  93
  94 static int do_write(struct connection *c) {
  95     struct memchunk chunk;
  96     ssize_t r;
  97
  98     if (!iochannel_is_writable(c->io))
  99         return 0;
 100
 101     if (!c->source_output)
 102         return 0;
 103
 104     assert(c->output_memblockq);
 105     if (memblockq_peek(c->output_memblockq, &chunk) < 0)
 106         return 0;
 107
 108     assert(chunk.memblock && chunk.length);
 109
 110     if ((r = iochannel_write(c->io, chunk.memblock->data+chunk.index, chunk.length)) < 0) {
 111         fprintf(stderr, "write(): %s\n", strerror(errno));
 112         memblock_unref(chunk.memblock);
 113         return -1;
 114     }
 115
 116     memblockq_drop(c->output_memblockq, r);
 117     memblock_unref(chunk.memblock);
 118     return 0;
 119 }
 120
 121 /*** sink_input callbacks ***/
 122
 123 static int sink_input_peek_cb(struct sink_input *i, struct memchunk *chunk, uint8_t *volume) {
 124     struct connection*c = i->userdata;
 125     assert(i && c && chunk && volume);
 126
 127     if (memblockq_peek(c->input_memblockq, chunk) < 0)
 128         return -1;
 129
 130     *volume = 0xFF;
 131     return 0;
 132 }
 133
 134 static void sink_input_drop_cb(struct sink_input *i, size_t length) {
 135     struct connection*c = i->userdata;
 136     assert(i && c && length);
 137
 138     memblockq_drop(c->input_memblockq, length);
 139
 140     if (do_read(c) < 0)
 141         destroy_connection(c);
 142 }
 143
 144 static void sink_input_kill_cb(struct sink_input *i) {
 145     assert(i && i->userdata);
 146     destroy_connection((struct connection *) i->userdata);
 147 }
 148
 149 /*** source_output callbacks ***/
 150
 151 static void source_output_push_cb(struct source_output *o, struct memchunk *chunk) {
 152     struct connection *c = o->userdata;
 153     assert(o && c && chunk);
 154
 155     memblockq_push(c->output_memblockq, chunk, 0);
 156
 157     if (do_write(c) < 0)
 158         destroy_connection(c);
 159 }
 160
 161 static void source_output_kill_cb(struct source_output *o) {
 162     assert(o && o->userdata);
 163     destroy_connection((struct connection *) o->userdata);
 164 }
 165
 166
 167 /*** client callbacks ***/
 168
 169 static void client_kill_cb(struct client *c) {
 170     assert(c && c->userdata);
 171     destroy_connection((struct connection *) c->userdata);
 172 }
 173
 174 /*** iochannel callbacks ***/
 175
 176 static void io_callback(struct iochannel*io, void *userdata) {
 177     struct connection *c = userdata;
 178     assert(io && c && c->io == io);
 179
 180     if (do_read(c) < 0 || do_write(c) < 0)
 181         destroy_connection(c);
 182 }
 183
 184 /*** socket_server callbacks */
 185
 186 static void on_connection(struct socket_server*s, struct iochannel *io, void *userdata) {
 187     struct protocol_simple *p = userdata;
 188     struct connection *c = NULL;
 189     assert(s && io && p);
 190
 191     c = malloc(sizeof(struct connection));
 192     assert(c);
 193     c->io = io;
 194     c->sink_input = NULL;
 195     c->source_output = NULL;
 196     c->input_memblockq = c->output_memblockq = NULL;
 197     c->protocol = p;
 198
 199     c->client = client_new(p->core, "SIMPLE", "Client");
 200     assert(c->client);
 201     c->client->kill = client_kill_cb;
 202     c->client->userdata = c;
 203
 204     if (p->mode & PROTOCOL_SIMPLE_RECORD) {
 205         struct source *source;
 206         size_t l;
 207
 208         if (!(source = core_get_default_source(p->core))) {
 209             fprintf(stderr, "Failed to get default source.\n");
 210             goto fail;
 211         }
 212
 213         c->source_output = source_output_new(source, &DEFAULT_SAMPLE_SPEC, c->client->name);
 214         assert(c->source_output);
 215         c->source_output->push = source_output_push_cb;
 216         c->source_output->kill = source_output_kill_cb;
 217         c->source_output->userdata = c;
 218
 219         l = 5*bytes_per_second(&DEFAULT_SAMPLE_SPEC); /* 5s */
 220         c->output_memblockq = memblockq_new(l, sample_size(&DEFAULT_SAMPLE_SPEC), l/2);
 221     }
 222
 223     if (p->mode & PROTOCOL_SIMPLE_PLAYBACK) {
 224         struct sink *sink;
 225         size_t l;
 226
 227         if (!(sink = core_get_default_sink(p->core))) {
 228             fprintf(stderr, "Failed to get default sink.\n");
 229             goto fail;
 230         }
 231
 232         c->sink_input = sink_input_new(sink, &DEFAULT_SAMPLE_SPEC, c->client->name);
 233         assert(c->sink_input);
 234         c->sink_input->peek = sink_input_peek_cb;
 235         c->sink_input->drop = sink_input_drop_cb;
 236         c->sink_input->kill = sink_input_kill_cb;
 237         c->sink_input->userdata = c;
 238
 239         l = bytes_per_second(&DEFAULT_SAMPLE_SPEC)/2; /* half a second */
 240         c->input_memblockq = memblockq_new(l, sample_size(&DEFAULT_SAMPLE_SPEC), l/2);
 241     }
 242
 243
 244     iochannel_set_callback(c->io, io_callback, c);
 245     idxset_put(p->connections, c, NULL);
 246     return;
 247
 248 fail:
 249     if (c) {
 250         free_connection(c, NULL);
 251         iochannel_free(c->io);
 252         free(c);
 253     }
 254 }
 255
 256 struct protocol_simple* protocol_simple_new(struct core *core, struct socket_server *server, enum protocol_simple_mode mode) {
 257     struct protocol_simple* p;
 258     assert(core && server && mode <= PROTOCOL_SIMPLE_DUPLEX && mode > 0);
 259
 260     p = malloc(sizeof(struct protocol_simple));
 261     assert(p);
 262     p->core = core;
 263     p->server = server;
 264     p->connections = idxset_new(NULL, NULL);
 265     p->mode = mode;
 266
 267     socket_server_set_callback(p->server, on_connection, p);
 268
 269     return p;
 270 }
 271
 272
 273 void protocol_simple_free(struct protocol_simple *p) {
 274     assert(p);
 275
 276     idxset_free(p->connections, free_connection, NULL);
 277     socket_server_free(p->server);
 278     free(p);
 279 }