2 Copyright (C) 2012-2013 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include "audio_buffers.h"
26 using boost::shared_ptr;
28 /** Construct an AudioBuffers. Audio data is undefined after this constructor.
29 * @param channels Number of channels.
30 * @param frames Number of frames to reserve space for.
32 AudioBuffers::AudioBuffers (int channels, int frames)
34 allocate (channels, frames);
38 * @param other Other AudioBuffers; data is copied.
40 AudioBuffers::AudioBuffers (AudioBuffers const & other)
42 allocate (other._channels, other._frames);
43 copy_from (&other, other._frames, 0, 0);
46 AudioBuffers::AudioBuffers (boost::shared_ptr<const AudioBuffers> other)
48 allocate (other->_channels, other->_frames);
49 copy_from (other.get(), other->_frames, 0, 0);
53 AudioBuffers::operator= (AudioBuffers const & other)
60 allocate (other._channels, other._frames);
61 copy_from (&other, other._frames, 0, 0);
66 /** AudioBuffers destructor */
67 AudioBuffers::~AudioBuffers ()
73 AudioBuffers::allocate (int channels, int frames)
77 _allocated_frames = frames;
79 _data = static_cast<float**> (malloc (_channels * sizeof (float *)));
84 for (int i = 0; i < _channels; ++i) {
85 _data[i] = static_cast<float*> (malloc (frames * sizeof (float)));
93 AudioBuffers::deallocate ()
95 for (int i = 0; i < _channels; ++i) {
102 /** @param c Channel index.
103 * @return Buffer for this channel.
106 AudioBuffers::data (int c) const
108 assert (c >= 0 && c < _channels);
112 /** Set the number of frames that these AudioBuffers will report themselves
113 * as having. If we reduce the number of frames, the `lost' frames will
115 * @param f Frames; must be less than or equal to the number of allocated frames.
118 AudioBuffers::set_frames (int f)
120 assert (f <= _allocated_frames);
122 for (int c = 0; c < _channels; ++c) {
123 for (int i = f; i < _frames; ++i) {
131 /** Make all samples on all channels silent */
133 AudioBuffers::make_silent ()
135 for (int i = 0; i < _channels; ++i) {
140 /** Make all samples on a given channel silent.
144 AudioBuffers::make_silent (int c)
146 assert (c >= 0 && c < _channels);
148 for (int i = 0; i < _frames; ++i) {
154 AudioBuffers::make_silent (int from, int frames)
156 assert ((from + frames) <= _allocated_frames);
158 for (int c = 0; c < _channels; ++c) {
159 for (int i = from; i < (from + frames); ++i) {
165 /** Copy data from another AudioBuffers to this one. All channels are copied.
166 * @param from AudioBuffers to copy from; must have the same number of channels as this.
167 * @param frames_to_copy Number of frames to copy.
168 * @param read_offset Offset to read from in `from'.
169 * @param write_offset Offset to write to in `to'.
172 AudioBuffers::copy_from (AudioBuffers const * from, int frames_to_copy, int read_offset, int write_offset)
174 assert (from->channels() == channels());
177 assert (read_offset >= 0 && (read_offset + frames_to_copy) <= from->_allocated_frames);
178 assert (write_offset >= 0 && (write_offset + frames_to_copy) <= _allocated_frames);
180 for (int i = 0; i < _channels; ++i) {
181 memcpy (_data[i] + write_offset, from->_data[i] + read_offset, frames_to_copy * sizeof(float));
185 /** Move audio data around.
186 * @param from Offset to move from.
187 * @param to Offset to move to.
188 * @param frames Number of frames to move.
192 AudioBuffers::move (int from, int to, int frames)
199 assert (from < _frames);
201 assert (to < _frames);
203 assert (frames <= _frames);
204 assert ((from + frames) <= _frames);
205 assert ((to + frames) <= _allocated_frames);
207 for (int i = 0; i < _channels; ++i) {
208 memmove (_data[i] + to, _data[i] + from, frames * sizeof(float));
212 /** Add data from from `from', `from_channel' to our channel `to_channel' */
214 AudioBuffers::accumulate_channel (AudioBuffers const * from, int from_channel, int to_channel)
216 int const N = frames ();
217 assert (from->frames() == N);
218 assert (to_channel <= _channels);
220 float* s = from->data (from_channel);
221 float* d = _data[to_channel];
223 for (int i = 0; i < N; ++i) {
228 /** Ensure we have space for at least a certain number of frames. If we extend
229 * the buffers, fill the new space with silence.
232 AudioBuffers::ensure_size (int frames)
234 if (_allocated_frames >= frames) {
238 for (int i = 0; i < _channels; ++i) {
239 _data[i] = static_cast<float*> (realloc (_data[i], frames * sizeof (float)));
243 for (int j = _allocated_frames; j < frames; ++j) {
248 _allocated_frames = frames;
252 AudioBuffers::accumulate_frames (AudioBuffers const * from, int read_offset, int write_offset, int frames)
254 assert (_channels == from->channels ());
256 for (int i = 0; i < _channels; ++i) {
257 for (int j = 0; j < frames; ++j) {
258 _data[i][j + write_offset] += from->data()[i][j + read_offset];