Differences

This shows you the differences between two versions of the page.

--- atrac3p:serialized_quantization_unit_tree_choice_info [2010/07/23 17:44] – quantizer -> quantization precision megadiscman
+++ atrac3p:serialized_quantization_unit_tree_choice_info [2010/10/16 22:36] (current) – linkfix megadiscman
@@ Line 18: / Line 18: @@
 === Mode 2: Delta encoding ===
-For quantization units needing a joint-stereo flag this mode works like mode 0 and mode 1 do, too, it just fetches a bit. For restricted or complete tree IDs, a code from the [[quantization unit tree id trees#restricted tree id|restricted tree ID tree]] or [[quantization unit tree id trees#delta prev tree id|delta-to-prev tree ID tree]] respectively. These codes are interpreted relative to the previous full or restricted tree ID, wrapping around after 3 or 7 respectively.
+For quantization units needing a joint-stereo flag this mode works like mode 0 and mode 1 do, too, it just fetches a bit. Otherwise, the Tree ID for the first quantization unit is loaded as in mode 1 (if needed). All further tree IDs are encoded relatively to the last tree ID (starting at 0 if the first quantization unit has no tree ID) using a code from the [[quantization unit tree id trees#restricted tree id|restricted tree ID tree]] or [[quantization unit tree id trees#delta prev tree id|delta-to-prev tree ID tree]]. The application of the differences wraps around after 3 or 7 respectively.
 === Mode 3 on master channel: Just zero ===
@@ Line 48: / Line 48: @@
 ==== Encoding mode 2: Delta encoding ====
+  * for the first quantization unit:
+     * non-zero quant, full IDs: code from [[quantization unit tree id trees#full tree ID tree|full tree id]]
+     * non-zero quant, restricted trees: code from [[quantization unit tree id trees#restricted tree id|restricted tree ID tree]]
+     * zero quant, master non-zero: 1 bit "don't copy" flag
   * for each explicit quantization unit
      * non-zero quant, full IDs: code from [[quantization unit tree id trees#delta prev tree id|delta-to-prev tree ID tree]] (delta to previous ID/to zero)