/*
- Copyright (C) 2012-2013 Carl Hetherington <cth@carlh.net>
+ Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
*/
+
+#include "util.h"
#include "audio_buffers.h"
#include "dcpomatic_assert.h"
#include <cassert>
#include <cmath>
#include <stdexcept>
+
using std::bad_alloc;
-using boost::shared_ptr;
+using std::shared_ptr;
+using std::make_shared;
+
/** Construct an AudioBuffers. Audio data is undefined after this constructor.
* @param channels Number of channels.
allocate (channels, frames);
}
+
/** Copy constructor.
* @param other Other AudioBuffers; data is copied.
*/
copy_from (&other, other._frames, 0, 0);
}
-AudioBuffers::AudioBuffers (boost::shared_ptr<const AudioBuffers> other)
+
+AudioBuffers::AudioBuffers (std::shared_ptr<const AudioBuffers> other)
{
allocate (other->_channels, other->_frames);
copy_from (other.get(), other->_frames, 0, 0);
}
+
+AudioBuffers::AudioBuffers (std::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)
{
return *this;
}
+
/** AudioBuffers destructor */
AudioBuffers::~AudioBuffers ()
{
deallocate ();
}
+
void
AudioBuffers::allocate (int channels, int32_t frames)
{
_frames = frames;
_allocated_frames = frames;
- _data = static_cast<float**> (malloc (_channels * sizeof (float *)));
+ _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 ();
}
}
}
+
void
AudioBuffers::deallocate ()
{
free (_data);
}
+
/** @param c Channel index.
* @return Buffer for this channel.
*/
return _data[c];
}
+
/** Set the number of frames that these AudioBuffers will report themselves
* as having. If we reduce the number of frames, the `lost' frames will
* be silenced.
{
DCPOMATIC_ASSERT (f <= _allocated_frames);
- for (int c = 0; c < _channels; ++c) {
- for (int i = f; i < _frames; ++i) {
- _data[c][i] = 0;
- }
+ 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 ()
{
}
}
+
/** Make all samples on a given channel silent.
* @param c Channel.
*/
{
DCPOMATIC_ASSERT (c >= 0 && c < _channels);
- for (int i = 0; i < _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], 0, _frames * sizeof(float));
}
+
+/** Make some frames.
+ * @param from Start frame.
+ * @param frames Number of frames to silence.
+ */
void
AudioBuffers::make_silent (int32_t from, int32_t 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));
}
}
+
/** Copy data from another AudioBuffers to this one. All channels are copied.
* @param from AudioBuffers to copy from; must have the same number of channels as this.
* @param frames_to_copy Number of frames to copy.
return;
}
- DCPOMATIC_ASSERT (from->channels() == channels());
-
DCPOMATIC_ASSERT (from);
+ DCPOMATIC_ASSERT (from->channels() == channels());
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);
}
}
+
/** Move audio data around.
* @param from Offset to move from.
* @param to Offset to move to.
* @param frames Number of frames to move.
*/
-
void
-AudioBuffers::move (int32_t from, int32_t to, int32_t frames)
+AudioBuffers::move (int32_t frames, int32_t from, int32_t to)
{
if (frames == 0) {
return;
}
}
+
/** 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
DCPOMATIC_ASSERT (from->frames() == N);
DCPOMATIC_ASSERT (to_channel <= _channels);
- float* s = from->data (from_channel);
- float* d = _data[to_channel];
+ auto s = from->data (from_channel);
+ auto d = _data[to_channel];
for (int i = 0; i < N; ++i) {
*d++ += (*s++) * gain;
}
}
+
/** Ensure we have space for at least a certain number of frames. If we extend
* the buffers, fill the new space with silence.
*/
frames++;
for (int i = 0; i < _channels; ++i) {
- _data[i] = static_cast<float*> (realloc (_data[i], frames * sizeof (float)));
+ _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;
- }
}
+ auto 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, int32_t read_offset, int32_t write_offset, int32_t frames)
+AudioBuffers::accumulate_frames (AudioBuffers const * from, int32_t frames, int32_t read_offset, int32_t write_offset)
{
DCPOMATIC_ASSERT (_channels == from->channels ());
DCPOMATIC_ASSERT (read_offset >= 0);
DCPOMATIC_ASSERT (write_offset >= 0);
+ auto 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 = pow (10, dB / 20);
+ auto const linear = db_to_linear (dB);
for (int i = 0; i < _channels; ++i) {
for (int j = 0; j < _frames; ++j) {
}
}
+
/** @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 ()));
+ auto o = make_shared<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)
{
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);
+ auto b = make_shared<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