ao_write.c

   1 /*
   2  * Copyright (C) 2011-2012 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file ao_write.c Paraslash's libao output plugin. */
   8
   9 #include <pthread.h>
  10 #include <ao/ao.h>
  11 #include <regex.h>
  12
  13 #include "para.h"
  14 #include "fd.h"
  15 #include "string.h"
  16 #include "list.h"
  17 #include "sched.h"
  18 #include "ggo.h"
  19 #include "buffer_tree.h"
  20 #include "write.h"
  21 #include "write_common.h"
  22 #include "ao_write.cmdline.h"
  23 #include "error.h"
  24
  25 struct private_aow_data {
  26         ao_device *dev;
  27         int bytes_per_frame;
  28
  29         pthread_t thread;
  30         pthread_attr_t attr;
  31         pthread_mutex_t mutex;
  32         pthread_cond_t data_available;
  33         struct btr_node *thread_btrn;
  34 };
  35
  36 static void aow_close(struct writer_node *wn)
  37 {
  38         struct private_aow_data *pawd = wn->private_data;
  39
  40         if (!pawd)
  41                 return;
  42         ao_close(pawd->dev);
  43         free(pawd);
  44         wn->private_data = NULL;
  45         ao_shutdown();
  46 }
  47
  48 static void aow_pre_select(struct sched *s, struct task *t)
  49 {
  50         struct writer_node *wn = container_of(t, struct writer_node, task);
  51         int ret = btr_node_status(wn->btrn, wn->min_iqs, BTR_NT_LEAF);
  52
  53         if (ret == 0)
  54                 return;
  55         sched_min_delay(s);
  56 }
  57
  58 static int aow_set_sample_format(unsigned sample_rate, unsigned channels,
  59                 int sample_format, ao_sample_format *result)
  60 {
  61         memset(result, 0, sizeof(*result));
  62         switch (sample_format) {
  63                 case SF_U8:
  64                 case SF_U16_LE:
  65                 case SF_U16_BE:
  66                         return -E_AO_BAD_SAMPLE_FORMAT;
  67                 case SF_S8:
  68                         /* no need to set byte_format */
  69                         result->bits = 8;
  70                         break;
  71                 case SF_S16_LE:
  72                         result->bits = 16;
  73                         result->byte_format = AO_FMT_LITTLE;
  74                         break;
  75                 case SF_S16_BE:
  76                         result->bits = 16;
  77                         result->byte_format = AO_FMT_BIG;
  78                         break;
  79                 default:
  80                         PARA_EMERG_LOG("bug: invalid sample format\n");
  81                         exit(EXIT_FAILURE);
  82         }
  83         result->channels = channels;
  84         result->rate = sample_rate;
  85         return 1;
  86 }
  87
  88 static int aow_open_device(int id, ao_sample_format *asf, ao_option *options,
  89                 ao_device **result)
  90 {
  91         const char *msg;
  92         ao_device *dev = ao_open_live(id, asf, options);
  93
  94         if (dev) {
  95                 *result = dev;
  96                 return 1;
  97         }
  98         switch (errno) {
  99                 case AO_ENODRIVER:
 100                         msg = "No driver corresponds to driver_id";
 101                         break;
 102                 case AO_ENOTLIVE:
 103                         msg = "This driver is not a live output device";
 104                         break;
 105                 case AO_EBADOPTION:
 106                         msg = "A valid option key has an invalid value";
 107                         break;
 108                 case AO_EOPENDEVICE:
 109                         msg = "Cannot open the device";
 110                         break;
 111                 case AO_EFAIL:
 112                         msg = "General libao error";
 113                         break;
 114                 default:
 115                         msg = "Unknown ao error";
 116                         break;
 117         }
 118         PARA_ERROR_LOG("%s\n", msg);
 119         return -E_AO_OPEN_LIVE;
 120 }
 121
 122 static int aow_init(struct writer_node *wn, unsigned sample_rate,
 123                 unsigned channels, int sample_format)
 124 {
 125         int id, ret, i;
 126         ao_option *aoo = NULL;
 127         ao_sample_format asf;
 128         ao_info *info;
 129         struct private_aow_data *pawd = para_malloc(sizeof(*pawd));
 130         struct ao_write_args_info *conf = wn->conf;
 131
 132         ao_initialize();
 133         if (conf->driver_given) {
 134                 ret = -E_AO_BAD_DRIVER;
 135                 id = ao_driver_id(conf->driver_arg);
 136         } else {
 137                 ret = -E_AO_DEFAULT_DRIVER;
 138                 id = ao_default_driver_id();
 139         }
 140         if (id < 0)
 141                 goto fail;
 142         info = ao_driver_info(id);
 143         assert(info && info->short_name);
 144         if (info->type == AO_TYPE_FILE) {
 145                 ret = -E_AO_FILE_NOT_SUPP;
 146                 goto fail;
 147         }
 148         PARA_INFO_LOG("using %s driver\n", info->short_name);
 149         for (i = 0; i < conf->ao_option_given; i++) {
 150                 char *o = para_strdup(conf->ao_option_arg[i]), *value;
 151
 152                 ret = -E_AO_BAD_OPTION;
 153                 value = strchr(o, ':');
 154                 if (!value) {
 155                         free(o);
 156                         goto fail;
 157                 }
 158                 *value = '\0';
 159                 value++;
 160                 PARA_INFO_LOG("appending option: key=%s, value=%s\n", o, value);
 161                 ret = ao_append_option(&aoo, o, value);
 162                 free(o);
 163                 if (ret == 0) {
 164                         ret = -E_AO_APPEND_OPTION;
 165                         goto fail;
 166                 }
 167         }
 168         ret = aow_set_sample_format(sample_rate, channels, sample_format, &asf);
 169         if (ret < 0)
 170                 goto fail;
 171         if (sample_format == SF_S8 || sample_format == SF_U8)
 172                 pawd->bytes_per_frame = channels;
 173         else
 174                 pawd->bytes_per_frame = channels * 2;
 175         ret = aow_open_device(id, &asf, aoo, &pawd->dev);
 176         if (ret < 0)
 177                 goto fail;
 178         PARA_INFO_LOG("successfully opened %s\n", info->short_name);
 179         wn->private_data = pawd;
 180         return 1;
 181 fail:
 182         free(pawd);
 183         return ret;
 184 }
 185
 186 __noreturn static void *aow_play(void *priv)
 187 {
 188         struct writer_node *wn = priv;
 189         struct private_aow_data *pawd = wn->private_data;
 190         struct btr_node *btrn = pawd->thread_btrn;
 191         size_t frames, bytes;
 192         char *data;
 193         int ret;
 194
 195         for (;;) {
 196                 /*
 197                  * Lock mutex and wait for signal. pthread_cond_wait() will
 198                  * automatically and atomically unlock mutex while it waits.
 199                  */
 200                 pthread_mutex_lock(&pawd->mutex);
 201                 for (;;) {
 202                         ret = btr_node_status(btrn, wn->min_iqs, BTR_NT_LEAF);
 203                         if (ret < 0)
 204                                 goto unlock;
 205                         if (ret > 0) {
 206                                 btr_merge(btrn, wn->min_iqs);
 207                                 bytes = btr_next_buffer(btrn, &data);
 208                                 frames = bytes / pawd->bytes_per_frame;
 209                                 if (frames > 0)
 210                                         break;
 211                                 /* eof and less than a single frame available */
 212                                 ret = -E_WRITE_COMMON_EOF;
 213                                 goto unlock;
 214                         }
 215                         //PARA_CRIT_LOG("waiting for data\n");
 216                         //usleep(1000);
 217                         //pthread_mutex_unlock(&pawd->mutex);
 218                         pthread_cond_wait(&pawd->data_available, &pawd->mutex);
 219                 }
 220                 pthread_mutex_unlock(&pawd->mutex);
 221                 assert(frames > 0);
 222                 bytes = frames * pawd->bytes_per_frame;
 223                 ret = -E_AO_PLAY;
 224                 if (ao_play(pawd->dev, data, bytes) == 0) /* failure */
 225                         goto out;
 226                 btr_consume(btrn, bytes);
 227         }
 228 unlock:
 229         pthread_mutex_unlock(&pawd->mutex);
 230 out:
 231         assert(ret < 0);
 232         PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 233         pthread_exit(NULL);
 234 }
 235
 236 static int aow_create_thread(struct writer_node *wn)
 237 {
 238         struct private_aow_data *pawd = wn->private_data;
 239         int ret;
 240         const char *msg;
 241
 242         /* initialize with default attributes */
 243         msg = "could not init mutex";
 244         ret = pthread_mutex_init(&pawd->mutex, NULL);
 245         if (ret < 0)
 246                 goto fail;
 247
 248         msg = "could not initialize condition variable";
 249         ret = pthread_cond_init(&pawd->data_available, NULL);
 250         if (ret < 0)
 251                 goto fail;
 252
 253         msg = "could not initialize thread attributes";
 254         ret = pthread_attr_init(&pawd->attr);
 255         if (ret < 0)
 256                 goto fail;
 257
 258         /* schedule this thread under the real-time policy SCHED_FIFO */
 259         msg = "could not set sched policy";
 260         ret = pthread_attr_setschedpolicy(&pawd->attr, SCHED_FIFO);
 261         if (ret < 0)
 262                 goto fail;
 263
 264         msg = "could not set detach state to joinable";
 265         ret = pthread_attr_setdetachstate(&pawd->attr, PTHREAD_CREATE_JOINABLE);
 266         if (ret < 0)
 267                 goto fail;
 268
 269         msg = "could not create thread";
 270         ret = pthread_create(&pawd->thread, &pawd->attr, aow_play, wn);
 271         if (ret < 0)
 272                 goto fail;
 273         return 1;
 274 fail:
 275         PARA_ERROR_LOG("%s (%s)\n", msg, strerror(ret));
 276         return -E_AO_PTHREAD;
 277 }
 278
 279 static void aow_post_select(__a_unused struct sched *s,
 280                 struct task *t)
 281 {
 282         struct writer_node *wn = container_of(t, struct writer_node, task);
 283         struct btr_node *btrn = wn->btrn;
 284         struct private_aow_data *pawd = wn->private_data;
 285         int ret;
 286
 287         if (!pawd) {
 288                 int32_t rate, ch, format;
 289                 struct btr_node_description bnd;
 290
 291                 ret = btr_node_status(btrn, wn->min_iqs, BTR_NT_LEAF);
 292                 if (ret < 0)
 293                         goto remove_btrn;
 294                 if (ret == 0)
 295                         return;
 296                 get_btr_sample_rate(btrn, &rate);
 297                 get_btr_channels(btrn, &ch);
 298                 get_btr_sample_format(btrn, &format);
 299                 ret = aow_init(wn, rate, ch, format);
 300                 if (ret < 0)
 301                         goto remove_btrn;
 302                 pawd = wn->private_data;
 303
 304                 /* set up thread btr node */
 305                 bnd.name = "ao_thread_btrn";
 306                 bnd.parent = btrn;
 307                 bnd.child = NULL;
 308                 bnd.handler = NULL;
 309                 bnd.context = pawd;
 310                 pawd->thread_btrn = btr_new_node(&bnd);
 311                 wn->private_data = pawd;
 312
 313                 ret = aow_create_thread(wn);
 314                 if (ret < 0)
 315                         goto remove_thread_btrn;
 316                 return;
 317         }
 318         pthread_mutex_lock(&pawd->mutex);
 319         ret = btr_node_status(btrn, wn->min_iqs, BTR_NT_LEAF);
 320         if (ret > 0) {
 321                 btr_pushdown(btrn);
 322                 pthread_cond_signal(&pawd->data_available);
 323         }
 324         pthread_mutex_unlock(&pawd->mutex);
 325         if (ret >= 0)
 326                 goto out;
 327         pthread_mutex_lock(&pawd->mutex);
 328         btr_remove_node(btrn);
 329         btrn = NULL;
 330         PARA_INFO_LOG("waiting for thread to terminate\n");
 331         pthread_cond_signal(&pawd->data_available);
 332         pthread_mutex_unlock(&pawd->mutex);
 333         pthread_join(pawd->thread, NULL);
 334 remove_thread_btrn:
 335         btr_remove_node(pawd->thread_btrn);
 336         btr_free_node(pawd->thread_btrn);
 337 remove_btrn:
 338         if (btrn)
 339                 btr_remove_node(btrn);
 340 out:
 341         t->error = ret;
 342 }
 343
 344 __malloc static void *aow_parse_config_or_die(const char *options)
 345 {
 346         struct ao_write_args_info *conf = para_calloc(sizeof(*conf));
 347
 348         /* exits on errors */
 349         ao_cmdline_parser_string(options, conf, "ao_write");
 350         return conf;
 351 }
 352
 353 static void aow_free_config(void *conf)
 354 {
 355         ao_cmdline_parser_free(conf);
 356 }
 357
 358 /**
 359  * The init function of the ao writer.
 360  *
 361  * \param w Pointer to the writer to initialize.
 362  *
 363  * \sa struct writer.
 364  */
 365 void ao_write_init(struct writer *w)
 366 {
 367         struct ao_write_args_info dummy;
 368         int i, j, num_drivers, num_lines;
 369         ao_info **driver_list;
 370         char **dh; /* detailed help */
 371
 372         ao_cmdline_parser_init(&dummy);
 373         w->close = aow_close;
 374         w->pre_select = aow_pre_select;
 375         w->post_select = aow_post_select;
 376         w->parse_config_or_die = aow_parse_config_or_die;
 377         w->free_config = aow_free_config;
 378         w->shutdown = NULL;
 379         w->help = (struct ggo_help) {
 380                 .short_help = ao_write_args_info_help,
 381         };
 382         /* create detailed help containing all supported drivers/options */
 383         for (i = 0; ao_write_args_info_detailed_help[i]; i++)
 384                 ; /* nothing */
 385         num_lines = i;
 386         dh = para_malloc((num_lines + 3) * sizeof(char *));
 387         for (i = 0; i < num_lines; i++)
 388                 dh[i] = para_strdup(ao_write_args_info_detailed_help[i]);
 389         dh[num_lines++] = para_strdup("libao drivers available on this host:");
 390         dh[num_lines++] = para_strdup("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
 391
 392         ao_initialize();
 393         driver_list = ao_driver_info_list(&num_drivers);
 394
 395         for (i = 0; i < num_drivers; i++) {
 396                 ao_info *info = driver_list[i];
 397                 char *keys = NULL, *tmp = NULL;
 398
 399                 if (info->type == AO_TYPE_FILE)
 400                         continue;
 401                 for (j = 0; j < info->option_count; j++) {
 402                         tmp = make_message("%s%s%s", keys? keys : "",
 403                                 keys? ", " : "",
 404                                 info->options[j]);
 405                         free(keys);
 406                         keys = tmp;
 407                 }
 408                 dh = para_realloc(dh, (num_lines + 6) * sizeof(char *));
 409                 dh[num_lines++] = make_message("%s: %s", info->short_name, info->name);
 410                 dh[num_lines++] = make_message("priority: %d", info->priority);
 411                 dh[num_lines++] = make_message("keys: %s", keys? keys : "[none]");
 412                 dh[num_lines++] = make_message("comment: %s", info->comment?
 413                         info->comment : "[none]");
 414                 dh[num_lines++] = para_strdup(NULL);
 415                 free(keys);
 416         }
 417         dh[num_lines] = NULL;
 418         w->help.detailed_help = (const char **)dh;
 419         ao_cmdline_parser_free(&dummy);
 420         ao_shutdown();
 421 }
 422