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)
33 : _channels (channels)
35 , _allocated_frames (frames)
37 _data = static_cast<float**> (malloc (_channels * sizeof (float *)));
42 for (int i = 0; i < _channels; ++i) {
43 _data[i] = static_cast<float*> (malloc (frames * sizeof (float)));
51 * @param other Other AudioBuffers; data is copied.
53 AudioBuffers::AudioBuffers (AudioBuffers const & other)
54 : _channels (other._channels)
55 , _frames (other._frames)
56 , _allocated_frames (other._frames)
58 _data = static_cast<float**> (malloc (_channels * sizeof (float *)));
63 for (int i = 0; i < _channels; ++i) {
64 _data[i] = static_cast<float*> (malloc (_frames * sizeof (float)));
68 memcpy (_data[i], other._data[i], _frames * sizeof (float));
72 /* XXX: it's a shame that this is a copy-and-paste of the above;
73 probably fixable with c++0x.
75 AudioBuffers::AudioBuffers (boost::shared_ptr<const AudioBuffers> other)
76 : _channels (other->_channels)
77 , _frames (other->_frames)
78 , _allocated_frames (other->_frames)
80 _data = static_cast<float**> (malloc (_channels * sizeof (float *)));
85 for (int i = 0; i < _channels; ++i) {
86 _data[i] = static_cast<float*> (malloc (_frames * sizeof (float)));
90 memcpy (_data[i], other->_data[i], _frames * sizeof (float));
94 /** AudioBuffers destructor */
95 AudioBuffers::~AudioBuffers ()
97 for (int i = 0; i < _channels; ++i) {
104 /** @param c Channel index.
105 * @return Buffer for this channel.
108 AudioBuffers::data (int c) const
110 assert (c >= 0 && c < _channels);
114 /** Set the number of frames that these AudioBuffers will report themselves
116 * @param f Frames; must be less than or equal to the number of allocated frames.
119 AudioBuffers::set_frames (int f)
121 assert (f <= _allocated_frames);
125 /** Make all samples on all channels silent */
127 AudioBuffers::make_silent ()
129 for (int i = 0; i < _channels; ++i) {
134 /** Make all samples on a given channel silent.
138 AudioBuffers::make_silent (int c)
140 assert (c >= 0 && c < _channels);
142 for (int i = 0; i < _frames; ++i) {
148 AudioBuffers::make_silent (int from, int frames)
150 assert ((from + frames) <= _allocated_frames);
152 for (int c = 0; c < _channels; ++c) {
153 for (int i = from; i < (from + frames); ++i) {
159 /** Copy data from another AudioBuffers to this one. All channels are copied.
160 * @param from AudioBuffers to copy from; must have the same number of channels as this.
161 * @param frames_to_copy Number of frames to copy.
162 * @param read_offset Offset to read from in `from'.
163 * @param write_offset Offset to write to in `to'.
166 AudioBuffers::copy_from (AudioBuffers const * from, int frames_to_copy, int read_offset, int write_offset)
168 assert (from->channels() == channels());
171 assert (read_offset >= 0 && (read_offset + frames_to_copy) <= from->_allocated_frames);
172 assert (write_offset >= 0 && (write_offset + frames_to_copy) <= _allocated_frames);
174 for (int i = 0; i < _channels; ++i) {
175 memcpy (_data[i] + write_offset, from->_data[i] + read_offset, frames_to_copy * sizeof(float));
179 /** Move audio data around.
180 * @param from Offset to move from.
181 * @param to Offset to move to.
182 * @param frames Number of frames to move.
186 AudioBuffers::move (int from, int to, int frames)
193 assert (from < _frames);
195 assert (to < _frames);
197 assert (frames <= _frames);
198 assert ((from + frames) <= _frames);
199 assert ((to + frames) <= _frames);
201 for (int i = 0; i < _channels; ++i) {
202 memmove (_data[i] + to, _data[i] + from, frames * sizeof(float));
206 /** Add data from from `from', `from_channel' to our channel `to_channel' */
208 AudioBuffers::accumulate_channel (AudioBuffers const * from, int from_channel, int to_channel)
210 int const N = frames ();
211 assert (from->frames() == N);
212 assert (to_channel <= _channels);
214 float* s = from->data (from_channel);
215 float* d = _data[to_channel];
217 for (int i = 0; i < N; ++i) {
222 /** Ensure we have space for at least a certain number of frames. If we extend
223 * the buffers, fill the new space with silence.
226 AudioBuffers::ensure_size (int frames)
228 if (_allocated_frames >= frames) {
232 for (int i = 0; i < _channels; ++i) {
233 _data[i] = static_cast<float*> (realloc (_data[i], frames * sizeof (float)));
237 for (int j = _allocated_frames; j < frames; ++j) {
242 _allocated_frames = frames;
246 AudioBuffers::accumulate_frames (AudioBuffers const * from, int read_offset, int write_offset, int frames)
248 assert (_channels == from->channels ());
250 for (int i = 0; i < _channels; ++i) {
251 for (int j = 0; j < frames; ++j) {
252 _data[i][j + write_offset] += from->data()[i][j + read_offset];