- /*
- * We use explicit/hierarchical signaling for LOAS.
- * Other than that, we request implicit signaling to FDK library, then
- * append explicit/backward-compatible signaling to ASC in case of MP4FF.
- *
- * Explicit/backward-compatible signaling of SBR is the most recommended
- * way in MPEG4 part3 spec, and seems the only way supported by iTunes.
- * Since FDK library does not support it, we have to do it on our side.
- */