output_all: moved code to audio_output_all_wait()

Synchronization with the output thread will be implemented in
output_all.c, not in player_thread.c.  Currently, that's just a simple
g_usleep(1ms).

2 files changed, 23 insertions, 0 deletions

diff --git a/src/output_all.c b/src/output_all.c
index 2e7d3a720..870d8aed3 100644
--- a/src/output_all.c
+++ b/src/output_all.c
@@ -408,6 +408,18 @@ audio_output_all_check(void)
 	return 0;
 }
 
+bool
+audio_output_all_wait(unsigned threshold)
+{
+	if (audio_output_all_check() < threshold)
+		return true;
+
+	/* XXX synchronize in a better way */
+	g_usleep(1000);
+
+	return audio_output_all_check() < threshold;
+}
+
 void
 audio_output_all_pause(void)
 {
diff --git a/src/output_all.h b/src/output_all.h
index 197a0bfd2..2a09514b2 100644
--- a/src/output_all.h
+++ b/src/output_all.h
@@ -105,6 +105,17 @@ unsigned
 audio_output_all_check(void);
 
 /**
+ * Checks if the size of the #music_pipe is below the #threshold.  If
+ * not, it attempts to synchronize with all output threads, and waits
+ * until another #music_chunk is finished.
+ *
+ * @param threshold the maximum number of chunks in the pipe
+ * @return true if there are less than #threshold chunks in the pipe
+ */
+bool
+audio_output_all_wait(unsigned threshold);
+
+/**
  * Puts all audio outputs into pause mode.  Most implementations will
  * simply close it then.
  */