2 Copyright (C) 2006 Paul Davis
4 This program is free software; you can redistribute it and/or modify it
5 under the terms of the GNU General Public License as published by the Free
6 Software Foundation; either version 2 of the License, or (at your option)
9 This program is distributed in the hope that it will be useful, but WITHOUT
10 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 You should have received a copy of the GNU General Public License along
15 with this program; if not, write to the Free Software Foundation, Inc.,
16 675 Mass Ave, Cambridge, MA 02139, USA.
19 #ifndef __ardour_audio_buffer_h__
20 #define __ardour_audio_buffer_h__
23 #include "ardour/buffer.h"
27 /** Buffer containing audio data. */
28 class AudioBuffer : public Buffer
31 AudioBuffer(size_t capacity);
34 void silence (framecnt_t len, framecnt_t offset = 0) {
36 assert(_capacity > 0);
37 assert(offset + len <= _capacity);
38 memset(_data + offset, 0, sizeof (Sample) * len);
39 if (len == _capacity) {
46 /** Read @a len frames @a src starting at @a src_offset into self starting at @ dst_offset*/
47 void read_from (const Buffer& src, framecnt_t len, framecnt_t dst_offset = 0, framecnt_t src_offset = 0) {
49 assert(_capacity > 0);
50 assert(src.type() == DataType::AUDIO);
51 assert(len <= _capacity);
52 memcpy(_data + dst_offset, ((AudioBuffer&)src).data() + src_offset, sizeof(Sample) * len);
53 if (dst_offset == 0 && src_offset == 0 && len == _capacity) {
54 _silent = src.silent();
56 _silent = _silent && src.silent();
61 /** Acumulate (add) @a len frames @a src starting at @a src_offset into self starting at @a dst_offset */
62 void merge_from (const Buffer& src, framecnt_t len, framecnt_t dst_offset = 0, framecnt_t src_offset = 0) {
63 const AudioBuffer* ab = dynamic_cast<const AudioBuffer*>(&src);
65 accumulate_from (*ab, len, dst_offset, src_offset);
68 /** Acumulate (add) @a len frames @a src starting at @a src_offset into self starting at @a dst_offset */
69 void accumulate_from (const AudioBuffer& src, framecnt_t len, framecnt_t dst_offset = 0, framecnt_t src_offset = 0) {
70 assert(_capacity > 0);
71 assert(len <= _capacity);
73 Sample* const dst_raw = _data + dst_offset;
74 const Sample* const src_raw = src.data() + src_offset;
76 mix_buffers_no_gain(dst_raw, src_raw, len);
78 _silent = (src.silent() && _silent);
82 /** Acumulate (add) @a len frames @a src starting at @a src_offset into self starting at @dst_offset
83 * scaling by @a gain_coeff */
84 void accumulate_with_gain_from (const AudioBuffer& src, framecnt_t len, gain_t gain_coeff, framecnt_t dst_offset = 0, framecnt_t src_offset = 0) {
86 assert(_capacity > 0);
87 assert(len <= _capacity);
93 Sample* const dst_raw = _data + dst_offset;
94 const Sample* const src_raw = src.data() + src_offset;
96 mix_buffers_with_gain (dst_raw, src_raw, len, gain_coeff);
98 _silent = ( (src.silent() && _silent) || (_silent && gain_coeff == 0) );
102 /** Accumulate (add) @a len frames FROM THE START OF @a src into self
103 * scaling by @a gain_coeff */
104 void accumulate_with_gain_from (const Sample* src_raw, framecnt_t len, gain_t gain_coeff, framecnt_t dst_offset = 0) {
106 assert(_capacity > 0);
107 assert(len <= _capacity);
109 Sample* const dst_raw = _data + dst_offset;
111 mix_buffers_with_gain (dst_raw, src_raw, len, gain_coeff);
113 _silent = (_silent && gain_coeff == 0);
117 /** Accumulate (add) @a len frames FROM THE START OF @a src into self
118 * scaling by @a gain_coeff */
119 void accumulate_with_ramped_gain_from (const Sample* src, framecnt_t len, gain_t initial, gain_t target, framecnt_t dst_offset = 0) {
121 assert(_capacity > 0);
122 assert(len <= _capacity);
124 Sample* dst = _data + dst_offset;
125 gain_t gain_delta = (target - initial)/len;
127 for (framecnt_t n = 0; n < len; ++n) {
128 *dst++ += (*src++ * initial);
129 initial += gain_delta;
132 _silent = (_silent && initial == 0 && target == 0);
136 void apply_gain (gain_t gain, framecnt_t len) {
137 apply_gain_to_buffer (_data, len, gain);
140 /** Set the data contained by this buffer manually (for setting directly to jack buffer).
142 * Constructor MUST have been passed capacity=0 or this will die (to prevent mem leaks).
144 void set_data (Sample* data, size_t size) {
145 assert(!_owns_data); // prevent leaks
153 /** Reallocate the buffer used internally to handle at least @nframes of data
155 * Constructor MUST have been passed capacity!=0 or this will die (to prevent mem leaks).
157 void resize (size_t nframes);
160 const Sample* data (framecnt_t offset = 0) const {
161 assert(offset <= _capacity);
162 return _data + offset;
165 Sample* data (framecnt_t offset = 0) {
166 assert(offset <= _capacity);
167 return _data + offset;
170 void prepare () { _written = false; _silent = false; }
171 bool written() const { return _written; }
176 Sample* _data; ///< Actual buffer contents
180 } // namespace ARDOUR
182 #endif // __ardour_audio_audio_buffer_h__