update audio-buffer assert, take offset into account

diff --git a/libs/ardour/ardour/audio_buffer.h b/libs/ardour/ardour/audio_buffer.h
index 7752c614d5eee8807c8fdac7fe899794eb16dc51..aaad961abb7239791fad13b79fc79041a14e8aae 100644 (file)
--- a/libs/ardour/ardour/audio_buffer.h
+++ b/libs/ardour/ardour/audio_buffer.h
@@ -62,7 +62,7 @@ public:
                assert(&src != this);
                assert(_capacity > 0);
                assert(src.type() == DataType::AUDIO);
-               assert(len <= _capacity);
+               assert(dst_offset + len <= _capacity);
                assert( src_offset <= ((framecnt_t) src.capacity()-len));
                memcpy(_data + dst_offset, ((const AudioBuffer&)src).data() + src_offset, sizeof(Sample) * len);
                if (dst_offset == 0 && src_offset == 0 && len == _capacity) {