- /* special condition applies */
-
- if (_meter_point == MeterInput) {
- _input->process_input (_meter, start_frame, end_frame, nframes);
- }
-
- if (diskstream->record_enabled() && !can_record && !_session.config.get_auto_input()) {
-
- /* not actually recording, but we want to hear the input material anyway,
- at least potentially (depending on monitoring options)
- */
-
- passthru (start_frame, end_frame, nframes, false);
-
- } else if ((b = diskstream->playback_buffer(0)) != 0) {
-
- /*
- XXX is it true that the earlier test on n_outputs()
- means that we can avoid checking it again here? i think
- so, because changing the i/o configuration of an IO
- requires holding the AudioEngine lock, which we hold
- while in the process() tree.
- */
-
-
- /* copy the diskstream data to all output buffers */
-
- size_t limit = input_streams ().n_audio();
- BufferSet& bufs = _session.get_scratch_buffers ();
- const size_t blimit = bufs.count().n_audio();
-
- uint32_t n;
- uint32_t i;
-
- if (limit > blimit) {
-
- /* example case: auditioner configured for stereo output,
- but loaded with an 8 channel file. there are only
- 2 passthrough buffers, but n_process_buffers() will
- return 8.
-
- arbitrary decision: map all channels in the diskstream
- to the outputs available.
- */
-
- float scaling = limit/blimit;
-
- for (i = 0, n = 1; i < blimit; ++i, ++n) {
-
- /* first time through just copy a channel into
- the output buffer.
- */
-
- Sample* bb = bufs.get_audio (i).data();
-
- for (pframes_t xx = 0; xx < nframes; ++xx) {
- bb[xx] = b[xx] * scaling;
- }
-
- if (n < diskstream->n_channels().n_audio()) {
- tmpb = diskstream->playback_buffer(n);
- if (tmpb!=0) {
- b = tmpb;
- }
- }
- }
-
- for (;i < limit; ++i, ++n) {
-
- /* for all remaining channels, sum with existing
- data in the output buffers
- */
-
- bufs.get_audio (i%blimit).accumulate_with_gain_from (b, nframes, 0, scaling);
-
- if (n < diskstream->n_channels().n_audio()) {
- tmpb = diskstream->playback_buffer(n);
- if (tmpb!=0) {
- b = tmpb;
- }
- }
-
- }
-
- limit = blimit;
-
- } else {
- for (i = 0, n = 1; i < limit; ++i, ++n) {
- memcpy (bufs.get_audio (i).data(), b, sizeof (Sample) * nframes);
- if (n < diskstream->n_channels().n_audio()) {
- tmpb = diskstream->playback_buffer(n);
- if (tmpb!=0) {
- b = tmpb;
- }
- }
- }
-
- /* try to leave any MIDI buffers alone */
-
- ChanCount chn;
- chn.set_audio (limit);
- chn.set_midi (_input->n_ports().n_midi());
- bufs.set_count (chn);
- }