player_thread: get "elapsed" from audio outputs

Tracking the "elapsed" time from the chunks which we have sent to the
output pipe is very imprecise: since we have implemented the music
pipe, we're sending large number of chunks at once, giving the
"elapsed" time stamp a resolution of usually more than a second.

This patch changes the source of this information to the outputs.  If
a chunk has been played by all outputs, the "elapsed" time stamp is
updated.

The new command PLAYER_COMMAND_REFRESH makes the player thread update
its status information: it tells the outputs to update the chunk time
stamp.  After that, player_control.elapsed_time is current.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/output_all.c b/src/output_all.c
index 4b5ba3a6f..b7a42a6a3 100644
--- a/src/output_all.c
+++ b/src/output_all.c
@@ -52,6 +52,11 @@ static struct music_buffer *g_music_buffer;
  */
 static struct music_pipe *g_mp;
 
+/**
+ * The "elapsed_time" stamp of the most recently finished chunk.
+ */
+static float audio_output_all_elapsed_time;
+
 unsigned int audio_output_count(void)
 {
 	return num_audio_outputs;
@@ -385,6 +390,8 @@ audio_output_all_check(void)
 			   this chunk */
 			return music_pipe_size(g_mp);
 
+		audio_output_all_elapsed_time = chunk->times;
+
 		is_tail = chunk->next == NULL;
 		if (is_tail)
 			/* this is the tail of the pipe - clear the
@@ -468,9 +475,16 @@ audio_output_all_close(void)
 		music_pipe_clear(g_mp, g_music_buffer);
 		music_pipe_free(g_mp);
 		g_mp = NULL;
+		audio_output_all_elapsed_time = 0.0;
 	}
 
 	g_music_buffer = NULL;
 
 	audio_format_clear(&input_audio_format);
 }
+
+float
+audio_output_all_get_elapsed_time(void)
+{
+	return audio_output_all_elapsed_time;
+}