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).

1 files changed, 11 insertions, 0 deletions

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.
  */