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-rw-r--r--src/output_plugin.h18
-rw-r--r--src/output_thread.c30
2 files changed, 48 insertions, 0 deletions
diff --git a/src/output_plugin.h b/src/output_plugin.h
index fabfe0dfa..36e17ed1b 100644
--- a/src/output_plugin.h
+++ b/src/output_plugin.h
@@ -101,6 +101,16 @@ struct audio_output_plugin {
void (*close)(void *data);
/**
+ * Returns a positive number if the output thread shall delay
+ * the next call to play() or pause(). This should be
+ * implemented instead of doing a sleep inside the plugin,
+ * because this allows MPD to listen to commands meanwhile.
+ *
+ * @return the number of milliseconds to wait
+ */
+ unsigned (*delay)(void *data);
+
+ /**
* Display metadata for the next chunk. Optional method,
* because not all devices can display metadata.
*/
@@ -202,6 +212,14 @@ ao_plugin_close(const struct audio_output_plugin *plugin, void *data)
plugin->close(data);
}
+static inline unsigned
+ao_plugin_delay(const struct audio_output_plugin *plugin, void *data)
+{
+ return plugin->delay != NULL
+ ? plugin->delay(data)
+ : 0;
+}
+
static inline void
ao_plugin_send_tag(const struct audio_output_plugin *plugin,
void *data, const struct tag *tag)
diff --git a/src/output_thread.c b/src/output_thread.c
index c10a1552f..8b120325c 100644
--- a/src/output_thread.c
+++ b/src/output_thread.c
@@ -278,6 +278,30 @@ ao_reopen(struct audio_output *ao)
ao_open(ao);
}
+/**
+ * Wait until the output's delay reaches zero.
+ *
+ * @return true if playback should be continued, false if a command
+ * was issued
+ */
+static bool
+ao_wait(struct audio_output *ao)
+{
+ while (true) {
+ unsigned delay = ao_plugin_delay(ao->plugin, ao->data);
+ if (delay == 0)
+ return true;
+
+ GTimeVal tv;
+ g_get_current_time(&tv);
+ g_time_val_add(&tv, delay * 1000);
+ g_cond_timed_wait(ao->cond, ao->mutex, &tv);
+
+ if (ao->command != AO_COMMAND_NONE)
+ return false;
+ }
+}
+
static const char *
ao_chunk_data(struct audio_output *ao, const struct music_chunk *chunk,
struct filter *replay_gain_filter,
@@ -414,6 +438,9 @@ ao_play_chunk(struct audio_output *ao, const struct music_chunk *chunk)
while (size > 0 && ao->command == AO_COMMAND_NONE) {
size_t nbytes;
+ if (!ao_wait(ao))
+ break;
+
g_mutex_unlock(ao->mutex);
nbytes = ao_plugin_play(ao->plugin, ao->data, data, size,
&error);
@@ -511,6 +538,9 @@ static void ao_pause(struct audio_output *ao)
ao_command_finished(ao);
do {
+ if (!ao_wait(ao))
+ break;
+
g_mutex_unlock(ao->mutex);
ret = ao_plugin_pause(ao->plugin, ao->data);
g_mutex_lock(ao->mutex);