- void accumulate_frames (AudioBuffers const *, int32_t read_offset, int32_t write_offset, int32_t frames);
+ void accumulate_frames (AudioBuffers const * from, int32_t frames, int32_t read_offset, int32_t write_offset);
+ void append (boost::shared_ptr<const AudioBuffers> other);
+ void trim_start (int32_t frames);