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 /* XXX: it's a shame that this is a copy-and-paste of the above;
47 probably fixable with c++0x.
49 AudioBuffers::AudioBuffers (boost::shared_ptr<const AudioBuffers> other)
51 allocate (other->_channels, other->_frames);
52 copy_from (other.get(), other->_frames, 0, 0);
56 AudioBuffers::operator= (AudioBuffers const & other)
63 allocate (other._channels, other._frames);
64 copy_from (&other, other._frames, 0, 0);
69 /** AudioBuffers destructor */
70 AudioBuffers::~AudioBuffers ()
76 AudioBuffers::allocate (int channels, int frames)
80 _allocated_frames = frames;
82 _data = static_cast<float**> (malloc (_channels * sizeof (float *)));
87 for (int i = 0; i < _channels; ++i) {
88 _data[i] = static_cast<float*> (malloc (frames * sizeof (float)));
96 AudioBuffers::deallocate ()
98 for (int i = 0; i < _channels; ++i) {
105 /** @param c Channel index.
106 * @return Buffer for this channel.
109 AudioBuffers::data (int c) const
111 assert (c >= 0 && c < _channels);
115 /** Set the number of frames that these AudioBuffers will report themselves
117 * @param f Frames; must be less than or equal to the number of allocated frames.
120 AudioBuffers::set_frames (int f)
122 assert (f <= _allocated_frames);
126 /** Make all samples on all channels silent */
128 AudioBuffers::make_silent ()
130 for (int i = 0; i < _channels; ++i) {
135 /** Make all samples on a given channel silent.
139 AudioBuffers::make_silent (int c)
141 assert (c >= 0 && c < _channels);
143 for (int i = 0; i < _frames; ++i) {
149 AudioBuffers::make_silent (int from, int frames)
151 assert ((from + frames) <= _allocated_frames);
153 for (int c = 0; c < _channels; ++c) {
154 for (int i = from; i < (from + frames); ++i) {
160 /** Copy data from another AudioBuffers to this one. All channels are copied.
161 * @param from AudioBuffers to copy from; must have the same number of channels as this.
162 * @param frames_to_copy Number of frames to copy.
163 * @param read_offset Offset to read from in `from'.
164 * @param write_offset Offset to write to in `to'.
167 AudioBuffers::copy_from (AudioBuffers const * from, int frames_to_copy, int read_offset, int write_offset)
169 assert (from->channels() == channels());
172 assert (read_offset >= 0 && (read_offset + frames_to_copy) <= from->_allocated_frames);
173 assert (write_offset >= 0 && (write_offset + frames_to_copy) <= _allocated_frames);
175 for (int i = 0; i < _channels; ++i) {
176 memcpy (_data[i] + write_offset, from->_data[i] + read_offset, frames_to_copy * sizeof(float));
180 /** Move audio data around.
181 * @param from Offset to move from.
182 * @param to Offset to move to.
183 * @param frames Number of frames to move.
187 AudioBuffers::move (int from, int to, int frames)
194 assert (from < _frames);
196 assert (to < _frames);
198 assert (frames <= _frames);
199 assert ((from + frames) <= _frames);
200 assert ((to + frames) <= _frames);
202 for (int i = 0; i < _channels; ++i) {
203 memmove (_data[i] + to, _data[i] + from, frames * sizeof(float));
207 /** Add data from from `from', `from_channel' to our channel `to_channel' */
209 AudioBuffers::accumulate_channel (AudioBuffers const * from, int from_channel, int to_channel)
211 int const N = frames ();
212 assert (from->frames() == N);
213 assert (to_channel <= _channels);
215 float* s = from->data (from_channel);
216 float* d = _data[to_channel];
218 for (int i = 0; i < N; ++i) {
223 /** Ensure we have space for at least a certain number of frames. If we extend
224 * the buffers, fill the new space with silence.
227 AudioBuffers::ensure_size (int frames)
229 if (_allocated_frames >= frames) {
233 for (int i = 0; i < _channels; ++i) {
234 _data[i] = static_cast<float*> (realloc (_data[i], frames * sizeof (float)));
238 for (int j = _allocated_frames; j < frames; ++j) {
243 _allocated_frames = frames;
247 AudioBuffers::accumulate_frames (AudioBuffers const * from, int read_offset, int write_offset, int frames)
249 assert (_channels == from->channels ());
251 for (int i = 0; i < _channels; ++i) {
252 for (int j = 0; j < frames; ++j) {
253 _data[i][j + write_offset] += from->data()[i][j + read_offset];