/*
- Copyright (C) 2004-2007 Paul Davis
+ Copyright (C) 2004-2007 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
cerr << "RBEffect: source region: position = " << region->position()
<< ", start = " << region->start()
- << ", length = " << region->length()
+ << ", length = " << region->length()
<< ", ancestral_start = " << region->ancestral_start()
<< ", ancestral_length = " << region->ancestral_length()
<< ", stretch " << region->stretch()
/*
We have two cases to consider:
-
+
1. The region has not been stretched before.
-
+
In this case, we just want to read region->length() frames
from region->start().
-
+
We will create a new region of region->length() *
tsr.time_fraction frames. The new region will have its
start set to 0 (because it has a new audio file that begins
at the start of the stretched area) and its ancestral_start
set to region->start() (so that we know where to begin
reading if we want to stretch it again).
-
+
2. The region has been stretched before.
-
+
The region starts at region->start() frames into its
(possibly previously stretched) source file. But we don't
want to read from its source file; we want to read from the
file it was originally stretched from.
-
+
The region's source begins at region->ancestral_start()
frames into its master source file. Thus, we need to start
reading at region->ancestral_start() + (region->start() /
region->stretch()) frames into the master source. This
value will also become the ancestral_start for the new
region.
-
+
We cannot use region->ancestral_length() to establish how
many frames to read, because it won't be up to date if the
region has been trimmed since it was last stretched. We
stretch them by tsr.time_fraction * region->stretch(), for
a new region of region->length() * tsr.time_fraction
frames.
-
+
Case 1 is of course a special case of 2, where
region->ancestral_start() == 0 and region->stretch() == 1.
-
+
When we ask to read from a region, we supply a position on
the global timeline. The read function calculates the
offset into the source as (position - region->position()) +
n frames into the master source, we need to provide n -
region->start() + region->position() as our position
argument to master_read_at().
-
+
Note that region->ancestral_length() is not used.
-
+
I hope this is clear.
*/
RubberBandStretcher stretcher
(session.frame_rate(), channels,
(RubberBandStretcher::Options) tsr.opts, stretch, shift);
-
+
tsr.progress = 0.0f;
tsr.done = false;
} else if (shift == 1.0) {
snprintf (suffix, sizeof (suffix), "@%d", (int) floor (stretch * 100.0f));
} else {
- snprintf (suffix, sizeof (suffix), "@%d-%d",
+ snprintf (suffix, sizeof (suffix), "@%d-%d",
(int) floor (stretch * 100.0f),
(int) floor (shift * 100.0f));
}
avail = 0;
done = 0;
- try {
+ try {
while (pos < read_duration && !tsr.cancel) {
-
+
nframes_t this_read = 0;
for (uint32_t i = 0; i < channels; ++i) {
-
+
this_read = 0;
nframes_t this_time;
this_time = min(bufsize, read_duration - pos);
-
+
nframes_t this_position;
this_position = read_start + pos -
region->start() + region->position();
this_position,
this_time,
i);
-
+
if (this_read != this_time) {
error << string_compose
(_("tempoize: error reading data from %1 at %2 (wanted %3, got %4)"),
goto out;
}
}
-
+
pos += this_read;
done += this_read;
stretcher.study(buffers, this_read, pos == read_duration);
}
-
+
done = 0;
pos = 0;
while (pos < read_duration && !tsr.cancel) {
-
+
nframes_t this_read = 0;
-
+
for (uint32_t i = 0; i < channels; ++i) {
-
+
this_read = 0;
nframes_t this_time;
this_time = min(bufsize, read_duration - pos);
nframes_t this_position;
this_position = read_start + pos -
region->start() + region->position();
-
+
this_read = region->master_read_at
(buffers[i],
buffers[i],
this_position,
this_time,
i);
-
+
if (this_read != this_time) {
error << string_compose
(_("tempoize: error reading data from %1 at %2 (wanted %3, got %4)"),
this_read = min(bufsize, uint32_t(avail));
stretcher.retrieve(buffers, this_read);
-
+
for (uint32_t i = 0; i < nsrcs.size(); ++i) {
boost::shared_ptr<AudioSource> asrc = boost::dynamic_pointer_cast<AudioSource>(nsrcs[i]);
if (!asrc) {
continue;
}
-
+
if (asrc->write(buffers[i], this_read) !=
this_read) {
error << string_compose (_("error writing tempo-adjusted data to %1"), nsrcs[i]->name()) << endmsg;
stretch,
shift);
(*x)->set_master_sources (region->master_sources());
+ (*x)->set_length( (*x)->length() * stretch, this);
}
out:
(*si)->mark_for_remove ();
}
}
-
+
tsr.done = true;
return ret;
-
+
projects / ardour.git / blobdiff