rollback to 3428, before the mysterious removal of libs/* at 3431/3432

git-svn-id: svn://localhost/ardour2/branches/3.0@3435 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 121 insertions, 0 deletions

diff --git a/libs/ardour/ardour/audio_buffer.h b/libs/ardour/ardour/audio_buffer.h
new file mode 100644
index 0000000000..71eaf60ade
--- /dev/null
+++ b/libs/ardour/ardour/audio_buffer.h
@@ -0,0 +1,121 @@
+/*
+    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.
+*/
+
+#ifndef __ardour_audio_buffer_h__
+#define __ardour_audio_buffer_h__
+
+#include <cstring>
+#include <ardour/buffer.h>
+
+namespace ARDOUR {
+
+class AudioBuffer : public Buffer
+{
+public:
+	AudioBuffer(size_t capacity);
+	
+	~AudioBuffer();
+
+	void silence(nframes_t len, nframes_t offset = 0) {
+		if (!_silent) {
+			assert(_capacity > 0);
+			assert(offset + len <= _capacity);
+			memset(_data + offset, 0, sizeof (Sample) * len);
+			if (offset == 0 && len == _capacity) {
+				_silent = true;
+			}
+		}
+	}
+	
+	/** Read @a len frames FROM THE START OF @a src into self at @a offset */
+	void read_from(const Buffer& src, nframes_t len, nframes_t offset) {
+		assert(&src != this);
+		assert(_capacity > 0);
+		assert(src.type() == DataType::AUDIO);
+		assert(offset + len <= _capacity);
+		memcpy(_data + offset, ((AudioBuffer&)src).data(), sizeof(Sample) * len);
+		_silent = src.silent();
+	}
+	
+	/** Accumulate (add)@a len frames FROM THE START OF @a src into self at @a offset */
+	void accumulate_from(const AudioBuffer& src, nframes_t len, nframes_t offset) {
+		assert(_capacity > 0);
+		assert(offset + len <= _capacity);
+
+		Sample*       const dst_raw = _data + offset;
+		const Sample* const src_raw = src.data();
+
+		mix_buffers_no_gain(dst_raw, src_raw, len);
+
+		_silent = (src.silent() && _silent);
+	}
+	
+	/** Accumulate (add) @a len frames FROM THE START OF @a src into self at @a offset
+	 * scaling by @a gain_coeff */
+	void accumulate_with_gain_from(const AudioBuffer& src, nframes_t len, nframes_t offset, gain_t gain_coeff) {
+		assert(_capacity > 0);
+		assert(offset + len <= _capacity);
+
+		Sample*       const dst_raw = _data + offset;
+		const Sample* const src_raw = src.data();
+
+		mix_buffers_with_gain (dst_raw, src_raw, len, gain_coeff);
+
+		_silent = ( (src.silent() && _silent) || (_silent && gain_coeff == 0) );
+	}
+	
+	void apply_gain(gain_t gain, nframes_t len, nframes_t offset=0) {
+		apply_gain_to_buffer (_data + offset, 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) {
+		assert(!_owns_data); // prevent leaks
+		_capacity = size;
+		_size = size;
+		_data = data;
+		_silent = false;
+	}
+
+	/** 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 () const { return _data; }
+	Sample* data () { return _data; }
+
+	const Sample* data(nframes_t nframes, nframes_t offset) const
+		{ assert(offset + nframes <= _capacity); return _data + offset; }
+
+	Sample* data (nframes_t nframes, nframes_t offset)
+		{ assert(offset + nframes <= _capacity); return _data + offset; }
+
+private:
+	bool    _owns_data;
+	Sample* _data; ///< Actual buffer contents
+};
+
+
+} // namespace ARDOUR
+
+#endif // __ardour_audio_audio_buffer_h__