/*
Copyright (C) 2013-2015 Carl Hetherington <cth@carlh.net>
- This program is free software; you can redistribute it and/or modify
+ This file is part of DCP-o-matic.
+
+ DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
- This program is distributed in the hope that it will be useful,
+ DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "compose.hpp"
#include "dcpomatic_assert.h"
#include <samplerate.h>
+#include <iostream>
+#include <cmath>
#include "i18n.h"
using std::cout;
using std::pair;
using std::make_pair;
+using std::runtime_error;
using boost::shared_ptr;
+/** @param in Input sampling rate (Hz)
+ * @param out Output sampling rate (Hz)
+ * @param channels Number of channels.
+ */
Resampler::Resampler (int in, int out, int channels)
: _in_rate (in)
, _out_rate (out)
int error;
_src = src_new (SRC_SINC_BEST_QUALITY, _channels, &error);
if (!_src) {
- throw StringError (String::compose (N_("could not create sample-rate converter (%1)"), error));
+ throw runtime_error (String::compose (N_("could not create sample-rate converter (%1)"), error));
}
}
src_delete (_src);
}
-shared_ptr<const AudioBuffers>
-Resampler::run (shared_ptr<const AudioBuffers> in)
+void
+Resampler::set_fast ()
{
+ src_delete (_src);
+ int error;
+ _src = src_new (SRC_LINEAR, _channels, &error);
+ if (!_src) {
+ throw runtime_error (String::compose (N_("could not create sample-rate converter (%1)"), error));
+ }
+}
+
+pair<shared_ptr<const AudioBuffers>, Frame>
+Resampler::run (shared_ptr<const AudioBuffers> in, Frame frame)
+{
+ if (!_next_in || !_next_out || _next_in.get() != frame) {
+ /* Either there was a discontinuity in the input or this is the first input;
+ reset _next_out.
+ */
+ _next_out = lrintf (frame * _out_rate / _in_rate);
+ }
+
+ /* Expected next input frame */
+ _next_in = frame + in->frames ();
+
int in_frames = in->frames ();
int in_offset = 0;
int out_offset = 0;
int const max_resampled_frames = ceil ((double) in_frames * _out_rate / _in_rate) + 32;
SRC_DATA data;
- data.data_in = new float[in_frames * _channels];
+ float* in_buffer = new float[in_frames * _channels];
{
float** p = in->data ();
- float* q = data.data_in;
+ float* q = in_buffer;
for (int i = 0; i < in_frames; ++i) {
for (int j = 0; j < _channels; ++j) {
*q++ = p[j][in_offset + i];
}
}
+ data.data_in = in_buffer;
data.input_frames = in_frames;
data.data_out = new float[max_resampled_frames * _channels];
if (r) {
delete[] data.data_in;
delete[] data.data_out;
- throw EncodeError (String::compose (N_("could not run sample-rate converter (%1)"), src_strerror (r)));
+ throw EncodeError (
+ String::compose (
+ N_("could not run sample-rate converter (%1) [processing %2 to %3, %4 channels]"),
+ src_strerror (r),
+ in_frames,
+ max_resampled_frames,
+ _channels
+ )
+ );
}
if (data.output_frames_gen == 0) {
+ delete[] data.data_in;
+ delete[] data.data_out;
break;
}
delete[] data.data_out;
}
- return resampled;
+ Frame out_frame = _next_out.get ();
+
+ /* Expected next output frame */
+ _next_out = _next_out.get() + resampled->frames();
+
+ return make_pair (resampled, out_frame);
}
-shared_ptr<const AudioBuffers>
+pair<shared_ptr<const AudioBuffers>, Frame>
Resampler::flush ()
{
shared_ptr<AudioBuffers> out (new AudioBuffers (_channels, 0));
int64_t const output_size = 65536;
float dummy[1];
- float buffer[output_size];
+ float* buffer = new float[output_size];
SRC_DATA data;
data.data_in = dummy;
int const r = src_process (_src, &data);
if (r) {
+ delete[] buffer;
throw EncodeError (String::compose (N_("could not run sample-rate converter (%1)"), src_strerror (r)));
}
out_offset += data.output_frames_gen;
out->set_frames (out_offset);
- return out;
+ delete[] buffer;
+ return make_pair (out, _next_out.get ());
+}
+
+void
+Resampler::reset ()
+{
+ src_reset (_src);
}