/*
- Copyright (C) 2012-2013 Carl Hetherington <cth@carlh.net>
+ Copyright (C) 2012-2020 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 "util.h"
+#include "audio_buffers.h"
+#include "dcpomatic_assert.h"
#include <cassert>
#include <cstring>
+#include <cmath>
#include <stdexcept>
-#include "audio_buffers.h"
using std::bad_alloc;
using boost::shared_ptr;
* @param channels Number of channels.
* @param frames Number of frames to reserve space for.
*/
-AudioBuffers::AudioBuffers (int channels, int frames)
- : _channels (channels)
- , _frames (frames)
- , _allocated_frames (frames)
+AudioBuffers::AudioBuffers (int channels, int32_t frames)
{
- _data = static_cast<float**> (malloc (_channels * sizeof (float *)));
- if (!_data) {
- throw bad_alloc ();
- }
-
- for (int i = 0; i < _channels; ++i) {
- _data[i] = static_cast<float*> (malloc (frames * sizeof (float)));
- if (!_data[i]) {
- throw bad_alloc ();
- }
- }
+ allocate (channels, frames);
}
/** Copy constructor.
* @param other Other AudioBuffers; data is copied.
*/
AudioBuffers::AudioBuffers (AudioBuffers const & other)
- : _channels (other._channels)
- , _frames (other._frames)
- , _allocated_frames (other._frames)
{
- _data = static_cast<float**> (malloc (_channels * sizeof (float *)));
- if (!_data) {
- throw bad_alloc ();
- }
-
- for (int i = 0; i < _channels; ++i) {
- _data[i] = static_cast<float*> (malloc (_frames * sizeof (float)));
- if (!_data[i]) {
- throw bad_alloc ();
- }
- memcpy (_data[i], other._data[i], _frames * sizeof (float));
- }
+ allocate (other._channels, other._frames);
+ copy_from (&other, other._frames, 0, 0);
}
-/* XXX: it's a shame that this is a copy-and-paste of the above;
- probably fixable with c++0x.
-*/
AudioBuffers::AudioBuffers (boost::shared_ptr<const AudioBuffers> other)
- : _channels (other->_channels)
- , _frames (other->_frames)
- , _allocated_frames (other->_frames)
{
+ allocate (other->_channels, other->_frames);
+ copy_from (other.get(), other->_frames, 0, 0);
+}
+
+AudioBuffers::AudioBuffers (boost::shared_ptr<const AudioBuffers> other, int32_t frames_to_copy, int32_t read_offset)
+{
+ allocate (other->_channels, frames_to_copy);
+ copy_from (other.get(), frames_to_copy, read_offset, 0);
+}
+
+AudioBuffers &
+AudioBuffers::operator= (AudioBuffers const & other)
+{
+ if (this == &other) {
+ return *this;
+ }
+
+ deallocate ();
+ allocate (other._channels, other._frames);
+ copy_from (&other, other._frames, 0, 0);
+
+ return *this;
+}
+
+/** AudioBuffers destructor */
+AudioBuffers::~AudioBuffers ()
+{
+ deallocate ();
+}
+
+void
+AudioBuffers::allocate (int channels, int32_t frames)
+{
+ DCPOMATIC_ASSERT (frames >= 0);
+ DCPOMATIC_ASSERT (channels >= 0);
+
+ _channels = channels;
+ _frames = frames;
+ _allocated_frames = frames;
+
_data = static_cast<float**> (malloc (_channels * sizeof (float *)));
if (!_data) {
throw bad_alloc ();
}
-
+
for (int i = 0; i < _channels; ++i) {
- _data[i] = static_cast<float*> (malloc (_frames * sizeof (float)));
+ _data[i] = static_cast<float*> (malloc (frames * sizeof (float)));
if (!_data[i]) {
throw bad_alloc ();
}
- memcpy (_data[i], other->_data[i], _frames * sizeof (float));
}
}
-/** AudioBuffers destructor */
-AudioBuffers::~AudioBuffers ()
+void
+AudioBuffers::deallocate ()
{
for (int i = 0; i < _channels; ++i) {
free (_data[i]);
float*
AudioBuffers::data (int c) const
{
- assert (c >= 0 && c < _channels);
+ DCPOMATIC_ASSERT (c >= 0 && c < _channels);
return _data[c];
}
/** Set the number of frames that these AudioBuffers will report themselves
- * as having.
+ * as having. If we reduce the number of frames, the `lost' frames will
+ * be silenced.
* @param f Frames; must be less than or equal to the number of allocated frames.
*/
void
-AudioBuffers::set_frames (int f)
+AudioBuffers::set_frames (int32_t f)
{
- assert (f <= _allocated_frames);
+ DCPOMATIC_ASSERT (f <= _allocated_frames);
+
+ if (f < _frames) {
+ make_silent (f, _frames - f);
+ }
_frames = f;
}
-/** Make all samples on all channels silent */
+/** Make all frames silent */
void
AudioBuffers::make_silent ()
{
void
AudioBuffers::make_silent (int c)
{
- assert (c >= 0 && c < _channels);
-
- for (int i = 0; i < _frames; ++i) {
- _data[c][i] = 0;
- }
+ DCPOMATIC_ASSERT (c >= 0 && c < _channels);
+
+ /* This isn't really allowed, as all-bits-0 is not guaranteed to mean a 0 float,
+ but it seems that we can get away with it.
+ */
+ memset (_data[c], 0, _frames * sizeof(float));
}
+/** Make some frames.
+ * @param from Start frame.
+ * @param frames Number of frames to silence.
+ */
void
-AudioBuffers::make_silent (int from, int frames)
+AudioBuffers::make_silent (int32_t from, int32_t frames)
{
- assert ((from + frames) <= _allocated_frames);
+ DCPOMATIC_ASSERT ((from + frames) <= _allocated_frames);
for (int c = 0; c < _channels; ++c) {
- for (int i = from; i < (from + frames); ++i) {
- _data[c][i] = 0;
- }
+ /* This isn't really allowed, as all-bits-0 is not guaranteed to mean a 0 float,
+ but it seems that we can get away with it.
+ */
+ memset (_data[c] + from, 0, frames * sizeof(float));
}
}
* @param write_offset Offset to write to in `to'.
*/
void
-AudioBuffers::copy_from (AudioBuffers const * from, int frames_to_copy, int read_offset, int write_offset)
+AudioBuffers::copy_from (AudioBuffers const * from, int32_t frames_to_copy, int32_t read_offset, int32_t write_offset)
{
- assert (from->channels() == channels());
+ if (frames_to_copy == 0) {
+ /* Prevent the asserts from firing if there is nothing to do */
+ return;
+ }
+
+ DCPOMATIC_ASSERT (from->channels() == channels());
- assert (from);
- assert (read_offset >= 0 && (read_offset + frames_to_copy) <= from->_allocated_frames);
- assert (write_offset >= 0 && (write_offset + frames_to_copy) <= _allocated_frames);
+ DCPOMATIC_ASSERT (from);
+ DCPOMATIC_ASSERT (read_offset >= 0 && (read_offset + frames_to_copy) <= from->_allocated_frames);
+ DCPOMATIC_ASSERT (write_offset >= 0 && (write_offset + frames_to_copy) <= _allocated_frames);
for (int i = 0; i < _channels; ++i) {
memcpy (_data[i] + write_offset, from->_data[i] + read_offset, frames_to_copy * sizeof(float));
* @param to Offset to move to.
* @param frames Number of frames to move.
*/
-
void
-AudioBuffers::move (int from, int to, int frames)
+AudioBuffers::move (int32_t frames, int32_t from, int32_t to)
{
if (frames == 0) {
return;
}
-
- assert (from >= 0);
- assert (from < _frames);
- assert (to >= 0);
- assert (to < _frames);
- assert (frames > 0);
- assert (frames <= _frames);
- assert ((from + frames) <= _frames);
- assert ((to + frames) <= _frames);
-
+
+ DCPOMATIC_ASSERT (from >= 0);
+ DCPOMATIC_ASSERT (from < _frames);
+ DCPOMATIC_ASSERT (to >= 0);
+ DCPOMATIC_ASSERT (to < _frames);
+ DCPOMATIC_ASSERT (frames > 0);
+ DCPOMATIC_ASSERT (frames <= _frames);
+ DCPOMATIC_ASSERT ((from + frames) <= _frames);
+ DCPOMATIC_ASSERT ((to + frames) <= _allocated_frames);
+
for (int i = 0; i < _channels; ++i) {
memmove (_data[i] + to, _data[i] + from, frames * sizeof(float));
}
}
-/** Add data from from `from', `from_channel' to our channel `to_channel' */
+/** Add data from from `from', `from_channel' to our channel `to_channel'.
+ * @param from Buffers to copy data from.
+ * @param from_channel Channel index to read in \p from.
+ * @param to_channel Channel index to accumulate into.
+ * @param gain Linear gain to apply to the data before it is added.
+ */
void
-AudioBuffers::accumulate_channel (AudioBuffers const * from, int from_channel, int to_channel)
+AudioBuffers::accumulate_channel (AudioBuffers const * from, int from_channel, int to_channel, float gain)
{
int const N = frames ();
- assert (from->frames() == N);
- assert (to_channel <= _channels);
+ DCPOMATIC_ASSERT (from->frames() == N);
+ DCPOMATIC_ASSERT (to_channel <= _channels);
float* s = from->data (from_channel);
float* d = _data[to_channel];
for (int i = 0; i < N; ++i) {
- *d++ += *s++;
+ *d++ += (*s++) * gain;
}
}
* the buffers, fill the new space with silence.
*/
void
-AudioBuffers::ensure_size (int frames)
+AudioBuffers::ensure_size (int32_t frames)
{
if (_allocated_frames >= frames) {
return;
}
+ /* Round up frames to the next power of 2 to reduce the number
+ of realloc()s that are necessary.
+ */
+ frames--;
+ frames |= frames >> 1;
+ frames |= frames >> 2;
+ frames |= frames >> 4;
+ frames |= frames >> 8;
+ frames |= frames >> 16;
+ frames++;
+
for (int i = 0; i < _channels; ++i) {
_data[i] = static_cast<float*> (realloc (_data[i], frames * sizeof (float)));
if (!_data[i]) {
throw bad_alloc ();
}
- for (int j = _allocated_frames; j < frames; ++j) {
- _data[i][j] = 0;
- }
}
+ int32_t const old_allocated = _allocated_frames;
_allocated_frames = frames;
+ if (old_allocated < _allocated_frames) {
+ make_silent (old_allocated, _allocated_frames - old_allocated);
+ }
}
+/** Mix some other buffers with these ones. The AudioBuffers must have the same number of channels.
+ * @param from Audio buffers to get data from.
+ * @param frames Number of frames to mix.
+ * @param read_offset Offset within `from' to read from.
+ * @param write_offset Offset within this to mix into.
+ */
void
-AudioBuffers::accumulate_frames (AudioBuffers const * from, int read_offset, int write_offset, int frames)
+AudioBuffers::accumulate_frames (AudioBuffers const * from, int32_t frames, int32_t read_offset, int32_t write_offset)
{
- assert (_channels == from->channels ());
+ DCPOMATIC_ASSERT (_channels == from->channels ());
+ DCPOMATIC_ASSERT (read_offset >= 0);
+ DCPOMATIC_ASSERT (write_offset >= 0);
+ float** from_data = from->data ();
for (int i = 0; i < _channels; ++i) {
for (int j = 0; j < frames; ++j) {
- _data[i][j + write_offset] += from->data()[i][j + read_offset];
+ _data[i][j + write_offset] += from_data[i][j + read_offset];
+ }
+ }
+}
+
+/** @param dB gain in dB */
+void
+AudioBuffers::apply_gain (float dB)
+{
+ float const linear = db_to_linear (dB);
+
+ for (int i = 0; i < _channels; ++i) {
+ for (int j = 0; j < _frames; ++j) {
+ _data[i][j] *= linear;
}
}
}
+/** @param c Channel index.
+ * @return AudioBuffers object containing only channel `c' from this AudioBuffers.
+ */
+shared_ptr<AudioBuffers>
+AudioBuffers::channel (int c) const
+{
+ shared_ptr<AudioBuffers> o (new AudioBuffers (1, frames ()));
+ o->copy_channel_from (this, c, 0);
+ return o;
+}
+
+/** Copy all the samples from a channel on another AudioBuffers to a channel on this one.
+ * @param from AudioBuffers to copy from.
+ * @param from_channel Channel index in `from' to copy from.
+ * @param to_channel Channel index in this to copy into, overwriting what's already there.
+ */
+void
+AudioBuffers::copy_channel_from (AudioBuffers const * from, int from_channel, int to_channel)
+{
+ DCPOMATIC_ASSERT (from->frames() == frames());
+ memcpy (data(to_channel), from->data(from_channel), frames() * sizeof (float));
+}
+
+/** Make a copy of these AudioBuffers */
+shared_ptr<AudioBuffers>
+AudioBuffers::clone () const
+{
+ shared_ptr<AudioBuffers> b (new AudioBuffers (channels (), frames ()));
+ b->copy_from (this, frames (), 0, 0);
+ return b;
+}
+
+/** Extend these buffers with the data from another. The AudioBuffers must have the same number of channels. */
+void
+AudioBuffers::append (shared_ptr<const AudioBuffers> other)
+{
+ DCPOMATIC_ASSERT (channels() == other->channels());
+ ensure_size (_frames + other->frames());
+ copy_from (other.get(), other->frames(), 0, _frames);
+ _frames += other->frames();
+}
+
+/** Remove some frames from the start of these AudioBuffers */
+void
+AudioBuffers::trim_start (int32_t frames)
+{
+ DCPOMATIC_ASSERT (frames <= _frames);
+ move (_frames - frames, frames, 0);
+ set_frames (_frames - frames);
+}
projects / dcpomatic.git / blobdiff