/*
- * Copyright (C) 2011 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2011 Andre Noll <maan@tuebingen.mpg.de>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
#include <pthread.h>
#include <ao/ao.h>
#include <regex.h>
-#include <stdbool.h>
#include "para.h"
#include "fd.h"
pthread_t thread;
pthread_attr_t attr;
+ /* The mutex and the condition variable serialize access to ->btrn */
pthread_mutex_t mutex;
pthread_cond_t data_available;
struct btr_node *thread_btrn;
if (!pawd)
return;
+ assert(!pawd->thread_btrn);
ao_close(pawd->dev);
free(pawd);
wn->private_data = NULL;
- ao_shutdown();
}
-static void aow_pre_select(struct sched *s, struct task *t)
+static void aow_pre_select(struct sched *s, void *context)
{
- struct writer_node *wn = container_of(t, struct writer_node, task);
- int ret = btr_node_status(wn->btrn, wn->min_iqs, BTR_NT_LEAF);
+ struct writer_node *wn = context;
+ struct private_aow_data *pawd = wn->private_data;
+ int ret;
- if (ret == 0)
- return;
+ if (!pawd) { /* not yet started */
+ assert(wn->btrn);
+ ret = btr_node_status(wn->btrn, wn->min_iqs, BTR_NT_LEAF);
+ if (ret != 0)
+ goto min_delay;
+ return; /* no data available */
+ }
+ if (!wn->btrn) { /* EOF */
+ if (!pawd->thread_btrn) /* ready to exit */
+ goto min_delay;
+ /* wait for the play thread to terminate */
+ goto timeout;
+ }
+ pthread_mutex_lock(&pawd->mutex);
+ ret = btr_node_status(wn->btrn, wn->min_iqs, BTR_NT_LEAF);
+ pthread_mutex_unlock(&pawd->mutex);
+ if (ret != 0)
+ goto min_delay;
+ /*
+ * Even though the node status is zero, we might have data available,
+ * but the output buffer is full. If we don't set a timeout here, we
+ * are woken up only if new data arrives, which might be too late and
+ * result in a buffer underrun in the playing thread. To avoid this we
+ * never sleep longer than the (default) buffer time.
+ */
+timeout:
+ return sched_request_timeout_ms(20, s);
+min_delay:
sched_min_delay(s);
}
struct private_aow_data *pawd = para_malloc(sizeof(*pawd));
struct ao_write_args_info *conf = wn->conf;
- ao_initialize();
if (conf->driver_given) {
ret = -E_AO_BAD_DRIVER;
id = ao_driver_id(conf->driver_arg);
char *data;
int ret;
+ pthread_mutex_lock(&pawd->mutex);
for (;;) {
- /*
- * Lock mutex and wait for signal. pthread_cond_wait() will
- * automatically and atomically unlock mutex while it waits.
- */
- pthread_mutex_lock(&pawd->mutex);
for (;;) {
ret = btr_node_status(btrn, wn->min_iqs, BTR_NT_LEAF);
if (ret < 0)
- goto unlock;
+ goto fail;
if (ret > 0) {
btr_merge(btrn, wn->min_iqs);
bytes = btr_next_buffer(btrn, &data);
break;
/* eof and less than a single frame available */
ret = -E_WRITE_COMMON_EOF;
- goto unlock;
+ goto fail;
}
- //PARA_CRIT_LOG("waiting for data\n");
- //usleep(1000);
- //pthread_mutex_unlock(&pawd->mutex);
- pthread_cond_wait(&pawd->data_available, &pawd->mutex);
+ /*
+ * No data available, go to sleep and wait for the main
+ * thread to wake us up. pthread_cond_wait() unlocks
+ * the mutex while it waits and locks it again upon
+ * return.
+ */
+ ret = pthread_cond_wait(&pawd->data_available,
+ &pawd->mutex);
+ /* pthread_cond_wait() can never fail here */
+ assert(ret == 0);
}
- pthread_mutex_unlock(&pawd->mutex);
assert(frames > 0);
bytes = frames * pawd->bytes_per_frame;
- ret = -E_AO_PLAY;
- if (ao_play(pawd->dev, data, bytes) == 0) /* failure */
- goto out;
+ pthread_mutex_unlock(&pawd->mutex);
+ ret = ao_play(pawd->dev, data, bytes);
+ pthread_mutex_lock(&pawd->mutex);
+ if (ret == 0) { /* failure */
+ ret = -E_AO_PLAY;
+ goto fail;
+ }
btr_consume(btrn, bytes);
}
-unlock:
- pthread_mutex_unlock(&pawd->mutex);
-out:
+fail:
+ btr_remove_node(&pawd->thread_btrn);
assert(ret < 0);
PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
+ pthread_mutex_unlock(&pawd->mutex);
pthread_exit(NULL);
}
return -E_AO_PTHREAD;
}
-static void aow_post_select(__a_unused struct sched *s,
- struct task *t)
+static int aow_post_select(__a_unused struct sched *s, void *context)
{
- struct writer_node *wn = container_of(t, struct writer_node, task);
- struct btr_node *btrn = wn->btrn;
+ struct writer_node *wn = context;
struct private_aow_data *pawd = wn->private_data;
int ret;
int32_t rate, ch, format;
struct btr_node_description bnd;
- ret = btr_node_status(btrn, wn->min_iqs, BTR_NT_LEAF);
+ ret = btr_node_status(wn->btrn, wn->min_iqs, BTR_NT_LEAF);
if (ret < 0)
goto remove_btrn;
if (ret == 0)
- return;
- get_btr_sample_rate(btrn, &rate);
- get_btr_channels(btrn, &ch);
- get_btr_sample_format(btrn, &format);
+ return 0;
+ get_btr_sample_rate(wn->btrn, &rate);
+ get_btr_channels(wn->btrn, &ch);
+ get_btr_sample_format(wn->btrn, &format);
ret = aow_init(wn, rate, ch, format);
if (ret < 0)
goto remove_btrn;
/* set up thread btr node */
bnd.name = "ao_thread_btrn";
- bnd.parent = btrn;
+ bnd.parent = wn->btrn;
bnd.child = NULL;
bnd.handler = NULL;
bnd.context = pawd;
ret = aow_create_thread(wn);
if (ret < 0)
goto remove_thread_btrn;
- return;
+ return 0;
+ }
+ if (!wn->btrn) {
+ if (!pawd->thread_btrn) {
+ pthread_join(pawd->thread, NULL);
+ return -E_AO_EOF;
+ }
+ PARA_INFO_LOG("waiting for play thread to terminate\n");
+ return 0;
}
pthread_mutex_lock(&pawd->mutex);
- ret = btr_node_status(btrn, wn->min_iqs, BTR_NT_LEAF);
+ ret = btr_node_status(wn->btrn, wn->min_iqs, BTR_NT_LEAF);
if (ret > 0) {
- btr_pushdown(btrn);
- pthread_cond_signal(&pawd->data_available);
+ btr_pushdown(wn->btrn);
+ if (pthread_cond_signal(&pawd->data_available) != 0) {
+ ret = -E_AO_PTHREAD;
+ PARA_ERROR_LOG("pthread_cond_signal() failed\n");
+ goto remove_thread_btrn;
+ }
}
- pthread_mutex_unlock(&pawd->mutex);
- if (ret >= 0)
+ if (ret >= 0) {
+ pthread_mutex_unlock(&pawd->mutex);
goto out;
- pthread_mutex_lock(&pawd->mutex);
- btr_remove_node(btrn);
- btrn = NULL;
- PARA_INFO_LOG("waiting for thread to terminate\n");
+ }
+ btr_remove_node(&wn->btrn);
pthread_cond_signal(&pawd->data_available);
pthread_mutex_unlock(&pawd->mutex);
- pthread_join(pawd->thread, NULL);
+ return 0;
remove_thread_btrn:
- btr_remove_node(pawd->thread_btrn);
- btr_free_node(pawd->thread_btrn);
+ btr_remove_node(&pawd->thread_btrn);
remove_btrn:
- if (btrn)
- btr_remove_node(btrn);
+ btr_remove_node(&wn->btrn);
out:
- t->error = ret;
+ return ret;
}
-__malloc static void *aow_parse_config_or_die(const char *options)
+__malloc static void *aow_parse_config_or_die(int argc, char **argv)
{
struct ao_write_args_info *conf = para_calloc(sizeof(*conf));
/* exits on errors */
- ao_cmdline_parser_string(options, conf, "ao_write");
+ ao_write_cmdline_parser(argc, argv, conf);
return conf;
}
static void aow_free_config(void *conf)
{
- ao_cmdline_parser_free(conf);
+ ao_write_cmdline_parser_free(conf);
}
/**
ao_info **driver_list;
char **dh; /* detailed help */
- ao_cmdline_parser_init(&dummy);
+ ao_write_cmdline_parser_init(&dummy);
w->close = aow_close;
w->pre_select = aow_pre_select;
w->post_select = aow_post_select;
w->parse_config_or_die = aow_parse_config_or_die;
w->free_config = aow_free_config;
- w->shutdown = NULL;
- w->help = (struct ggo_help) {
- .short_help = ao_write_args_info_help,
- };
+ w->help = (struct ggo_help)DEFINE_GGO_HELP(ao_write);
/* create detailed help containing all supported drivers/options */
for (i = 0; ao_write_args_info_detailed_help[i]; i++)
; /* nothing */
}
dh[num_lines] = NULL;
w->help.detailed_help = (const char **)dh;
- ao_cmdline_parser_free(&dummy);
- ao_shutdown();
+ ao_write_cmdline_parser_free(&dummy);
}
projects / paraslash.git / blobdiff