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/* only to be used by subclasses */
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void _rb_encoder_emit_progress (RBEncoder *encoder, double fraction);
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void _rb_encoder_emit_completed (RBEncoder *encoder, guint64 dest_size, const char *mediatype, GError *error);
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void _rb_encoder_emit_prepare_source (RBEncoder *encoder, const char *uri, GObject *source);
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void _rb_encoder_emit_prepare_sink (RBEncoder *encoder, const char *uri, GObject *sink);