revert to single buffer for disk playback, and 5.x-style overwrite

Also address issues with MIDI and also atomicity of _pending_overwrite

1 files changed, 10 insertions, 0 deletions

diff --git a/libs/pbd/pbd/playback_buffer.h b/libs/pbd/pbd/playback_buffer.h
index 932f9224b3..1981adcdd8 100644
--- a/libs/pbd/pbd/playback_buffer.h
+++ b/libs/pbd/pbd/playback_buffer.h
@@ -119,6 +119,13 @@ public:
 	guint write (T const * src, guint cnt);
 	/* write-thead */
 	guint write_zero (guint cnt);
+	/* read-thead */
+	guint increment_write_ptr (guint cnt)
+	{
+		cnt = std::min (cnt, write_space ());
+		g_atomic_int_set (&write_idx, (g_atomic_int_get (&write_idx) + cnt) & size_mask);
+		return cnt;
+	}
 
 	/* read-thead */
 	void read_flush ()
@@ -171,6 +178,9 @@ public:
 		}
 	}
 
+	guint read_ptr() const { return read_idx; }
+	guint reserved_size() const { return reserved; }
+
 private:
 	T *buf;
 	guint reservation;