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/* the Music Player Daemon (MPD)
* Copyright (C) 2008 Max Kellermann <max@duempel.org>
* This project's homepage is: http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "output_thread.h"
#include "output_api.h"
#include "output_internal.h"
#include <glib.h>
#include <assert.h>
#include <stdlib.h>
#include <errno.h>
enum {
/** after a failure, wait this number of seconds before
automatically reopening the device */
REOPEN_AFTER = 10,
};
static void ao_command_finished(struct audio_output *ao)
{
assert(ao->command != AO_COMMAND_NONE);
ao->command = AO_COMMAND_NONE;
notify_signal(&audio_output_client_notify);
}
static void
ao_close(struct audio_output *ao)
{
assert(ao->open);
ao->plugin->close(ao->data);
pcm_convert_deinit(&ao->convert_state);
ao->open = false;
}
static void ao_play(struct audio_output *ao)
{
const char *data = ao->args.play.data;
size_t size = ao->args.play.size;
bool ret;
assert(size > 0);
if (!audio_format_equals(&ao->in_audio_format, &ao->out_audio_format)) {
data = pcm_convert(&ao->convert_state,
&ao->in_audio_format, data, size,
&ao->out_audio_format, &size);
/* under certain circumstances, pcm_convert() may
return an empty buffer - this condition should be
investigated further, but for now, do this check as
a workaround: */
if (data == NULL)
return;
}
ret = ao->plugin->play(ao->data, data, size);
if (!ret) {
ao->plugin->cancel(ao->data);
ao_close(ao);
}
ao_command_finished(ao);
}
static void ao_pause(struct audio_output *ao)
{
ao->plugin->cancel(ao->data);
if (ao->plugin->pause != NULL) {
/* pause is supported */
ao_command_finished(ao);
do {
bool ret;
ret = ao->plugin->pause(ao->data);
if (!ret) {
ao_close(ao);
break;
}
} while (ao->command == AO_COMMAND_NONE);
} else {
/* pause is not supported - simply close the device */
ao_close(ao);
ao_command_finished(ao);
}
}
static gpointer audio_output_task(gpointer arg)
{
struct audio_output *ao = arg;
bool ret;
while (1) {
switch (ao->command) {
case AO_COMMAND_NONE:
break;
case AO_COMMAND_OPEN:
assert(!ao->open);
ret = ao->plugin->open(ao->data,
&ao->out_audio_format);
assert(!ao->open);
if (ret) {
pcm_convert_init(&ao->convert_state);
ao->open = true;
} else
ao->reopen_after = time(NULL) + REOPEN_AFTER;
ao_command_finished(ao);
break;
case AO_COMMAND_CLOSE:
assert(ao->open);
ao->plugin->cancel(ao->data);
ao_close(ao);
ao_command_finished(ao);
break;
case AO_COMMAND_PLAY:
ao_play(ao);
break;
case AO_COMMAND_PAUSE:
ao_pause(ao);
break;
case AO_COMMAND_CANCEL:
ao->plugin->cancel(ao->data);
ao_command_finished(ao);
break;
case AO_COMMAND_SEND_TAG:
ao->plugin->send_tag(ao->data, ao->args.tag);
ao_command_finished(ao);
break;
case AO_COMMAND_KILL:
ao_command_finished(ao);
return NULL;
}
notify_wait(&ao->notify);
}
}
void audio_output_thread_start(struct audio_output *ao)
{
GError *e = NULL;
assert(ao->command == AO_COMMAND_NONE);
if (!(ao->thread = g_thread_create(audio_output_task, ao, true, &e)))
g_error("Failed to spawn output task: %s\n", e->message);
}
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