first pass at internal sends. this is a very tentative work in progress, and it is possible that major changes may follow in the near future. it is certainly not complete, but the fundamental changes to Port/Buffer operation merit a commit at this point

git-svn-id: svn://localhost/ardour2/branches/3.0@4464 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 22 insertions, 1 deletions

diff --git a/libs/ardour/ardour/audio_buffer.h b/libs/ardour/ardour/audio_buffer.h
index 9a41e8e093..829288a7af 100644
--- a/libs/ardour/ardour/audio_buffer.h
+++ b/libs/ardour/ardour/audio_buffer.h
@@ -68,9 +68,14 @@ public:
 	/** 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);
 
+		if (src.silent()) {
+			return;
+		}
+
 		Sample*       const dst_raw = _data + offset;
 		const Sample* const src_raw = src.data();
 
@@ -82,6 +87,7 @@ public:
 	/** 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 Sample* src_raw, nframes_t len, nframes_t offset, gain_t gain_coeff) {
+
 		assert(_capacity > 0);
 		assert(offset + len <= _capacity);
 
@@ -123,7 +129,22 @@ public:
 	Sample* data (nframes_t nframes, nframes_t offset)
 		{ assert(offset + nframes <= _capacity); return _data + offset; }
 
-private:
+	void replace_data (size_t nframes);
+
+	void drop_data () {
+		assert (_owns_data);
+		assert (_data);
+
+		free (_data);
+		_data = 0;
+		_size = 0;
+		_capacity = 0;
+		_silent = false;
+	}
+
+	void copy_to_internal (Sample* p, nframes_t cnt, nframes_t offset);
+
+  private:
 	bool    _owns_data;
 	Sample* _data; ///< Actual buffer contents
 };