/*
- Copyright (C) 2006 Paul Davis
-
+ Copyright (C) 2006 Paul Davis
+
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option)
any later version.
-
+
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
-
+
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
675 Mass Ave, Cambridge, MA 02139, USA.
namespace ARDOUR {
+/** Buffer containing audio data. */
class AudioBuffer : public Buffer
{
public:
AudioBuffer(size_t capacity);
~AudioBuffer();
- void silence (nframes_t len, nframes_t offset = 0) {
+ void silence (framecnt_t len, framecnt_t offset = 0) {
if (!_silent) {
assert(_capacity > 0);
assert(offset + len <= _capacity);
}
_written = true;
}
-
+
/** Read @a len frames @a src starting at @a src_offset into self starting at @ dst_offset*/
- void read_from (const Buffer& src, nframes_t len, nframes_t dst_offset = 0, nframes_t src_offset = 0) {
+ void read_from (const Buffer& src, framecnt_t len, framecnt_t dst_offset = 0, framecnt_t src_offset = 0) {
assert(&src != this);
assert(_capacity > 0);
assert(src.type() == DataType::AUDIO);
assert(len <= _capacity);
+ assert( src_offset <= ((framecnt_t) src.capacity()-len));
memcpy(_data + dst_offset, ((AudioBuffer&)src).data() + src_offset, sizeof(Sample) * len);
if (dst_offset == 0 && src_offset == 0 && len == _capacity) {
_silent = src.silent();
}
_written = true;
}
-
- /** Acumulate (add) @a len frames @a src starting at @a src_offset into self starting at @ dst_offset*/
- void accumulate_from (const AudioBuffer& src, nframes_t len, nframes_t dst_offset = 0, nframes_t src_offset = 0) {
+
+ /** Acumulate (add) @a len frames @a src starting at @a src_offset into self starting at @a dst_offset */
+ void merge_from (const Buffer& src, framecnt_t len, framecnt_t dst_offset = 0, framecnt_t src_offset = 0) {
+ const AudioBuffer* ab = dynamic_cast<const AudioBuffer*>(&src);
+ assert (ab);
+ accumulate_from (*ab, len, dst_offset, src_offset);
+ }
+
+ /** Acumulate (add) @a len frames @a src starting at @a src_offset into self starting at @a dst_offset */
+ void accumulate_from (const AudioBuffer& src, framecnt_t len, framecnt_t dst_offset = 0, framecnt_t src_offset = 0) {
assert(_capacity > 0);
assert(len <= _capacity);
_silent = (src.silent() && _silent);
_written = true;
}
-
- /** Acumulate (add) @a len frames @a src starting at @a src_offset into self starting at @ dst_offset
+
+ /** Acumulate (add) @a len frames @a src starting at @a src_offset into self starting at @dst_offset
* scaling by @a gain_coeff */
- void accumulate_with_gain_from (const AudioBuffer& src, nframes_t len, gain_t gain_coeff, nframes_t dst_offset = 0, nframes_t src_offset = 0) {
+ 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) {
assert(_capacity > 0);
assert(len <= _capacity);
/** Accumulate (add) @a len frames FROM THE START OF @a src into self
* scaling by @a gain_coeff */
- void accumulate_with_gain_from (const Sample* src_raw, nframes_t len, gain_t gain_coeff, nframes_t dst_offset = 0) {
+ void accumulate_with_gain_from (const Sample* src_raw, framecnt_t len, gain_t gain_coeff, framecnt_t dst_offset = 0) {
assert(_capacity > 0);
assert(len <= _capacity);
_silent = (_silent && gain_coeff == 0);
_written = true;
}
-
- void apply_gain (gain_t gain, nframes_t len) {
+
+ /** Accumulate (add) @a len frames FROM THE START OF @a src into self
+ * scaling by @a gain_coeff */
+ void accumulate_with_ramped_gain_from (const Sample* src, framecnt_t len, gain_t initial, gain_t target, framecnt_t dst_offset = 0) {
+
+ assert(_capacity > 0);
+ assert(len <= _capacity);
+
+ Sample* dst = _data + dst_offset;
+ gain_t gain_delta = (target - initial)/len;
+
+ for (framecnt_t n = 0; n < len; ++n) {
+ *dst++ += (*src++ * initial);
+ initial += gain_delta;
+ }
+
+ _silent = (_silent && initial == 0 && target == 0);
+ _written = true;
+ }
+
+ void apply_gain (gain_t gain, framecnt_t len) {
apply_gain_to_buffer (_data, len, gain);
}
/** Set the data contained by this buffer manually (for setting directly to jack buffer).
- *
+ *
* Constructor MUST have been passed capacity=0 or this will die (to prevent mem leaks).
*/
void set_data (Sample* data, size_t size) {
}
/** Reallocate the buffer used internally to handle at least @nframes of data
- *
+ *
* Constructor MUST have been passed capacity!=0 or this will die (to prevent mem leaks).
*/
void resize (size_t nframes);
- const Sample* data (nframes_t offset = 0) const {
- assert(offset <= _capacity);
- return _data + offset;
+ const Sample* data (framecnt_t offset = 0) const {
+ assert(offset <= _capacity);
+ return _data + offset;
}
- Sample* data (nframes_t offset = 0) {
- assert(offset <= _capacity);
- return _data + offset;
+ Sample* data (framecnt_t offset = 0) {
+ assert(offset <= _capacity);
+ return _data + offset;
}
- void prepare () { _written = false; }
+ void prepare () { _written = false; _silent = false; }
bool written() const { return _written; }
private:
bool _owns_data;
bool _written;
Sample* _data; ///< Actual buffer contents
-
};
projects / ardour.git / blobdiff