advance track's play-position even if processing is locked

[ardour.git] / libs / ardour / audio_diskstream.cc

diff --git a/libs/ardour/audio_diskstream.cc b/libs/ardour/audio_diskstream.cc
index c302e06681ca05f394b14c7451eafafb6e27501b..b9ce987c876ae50243ea59fea63eed7ee4ec4715 100644 (file)
--- a/libs/ardour/audio_diskstream.cc
+++ b/libs/ardour/audio_diskstream.cc
@@ -700,6 +700,31 @@ AudioDiskstream::process (BufferSet& bufs, framepos_t transport_frame, pframes_t
        return 0;
 }
 
+frameoffset_t
+AudioDiskstream::calculate_playback_distance (pframes_t nframes)
+{
+       frameoffset_t playback_distance = nframes;
+
+       if (record_enabled()) {
+               playback_distance = nframes;
+       } else if (_actual_speed != 1.0f && _actual_speed != -1.0f) {
+               interpolation.set_speed (_target_speed);
+               boost::shared_ptr<ChannelList> c = channels.reader();
+               int channel = 0;
+               for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan, ++channel) {
+                       playback_distance = interpolation.interpolate (channel, nframes, NULL, NULL);
+               }
+       } else {
+               playback_distance = nframes;
+       }
+
+       if (_actual_speed < 0.0) {
+               return -playback_distance;
+       } else {
+               return playback_distance;
+       }
+}
+
 /** Update various things including playback_sample, read pointer on each channel's playback_buf
  *  and write pointer on each channel's capture_buf.  Also wout whether the butler is needed.
  *  @return true if the butler is required.
@@ -900,7 +925,7 @@ AudioDiskstream::internal_playback_seek (framecnt_t distance)
        boost::shared_ptr<ChannelList> c = channels.reader();
 
        for (chan = c->begin(); chan != c->end(); ++chan) {
-               (*chan)->playback_buf->increment_read_ptr (distance);
+               (*chan)->playback_buf->increment_read_ptr (llabs(distance));
        }
 
        if (first_recordable_frame < max_framepos) {