atrac3p:serialized_tone_data
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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| atrac3p:serialized_tone_data [2010/07/24 10:02] – Adjust layout of mode description to common layout - forgot one section megadiscman | atrac3p:serialized_tone_data [2010/10/25 22:28] (current) – Fix tree name megadiscman | ||
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| === 1: variable-length-encoded difference-to-master === | === 1: variable-length-encoded difference-to-master === | ||
| - | The slave pitch is encoded as difference to the master pitch with the same tone index (if present) or the master tone with the highest index that is present, or, if there are no master tones at all, as difference to 0. Difference application wraps at 1024. | + | In each band, the slave pitches of all tones are encoded as difference to the master pitch with the same tone index in that band (if present) or the master tone with the highest index that is present, or, if there are no master tones at all, as difference to 0. Difference application wraps at 1024. |
| ===== Tone Linking ===== | ===== Tone Linking ===== | ||
| - | For the compression of level and phase information in the slave channel, tones in the slave channel are linked to tones in the master channel based on their pitch. The linking algorithm is like this: | + | For the compression of level information in the slave channel, tones in the slave channel are linked to tones in the master channel based on their pitch. The linking algorithm is like this: |
| * Look for the tone(s) in the master channel which have the lowest absolute deviation in pitch from the current slave tone. If more than one tone with the same absolute deviation is found, pick the first one. If the absolute deviation in pitch is less then 8, link to that tone. | * Look for the tone(s) in the master channel which have the lowest absolute deviation in pitch from the current slave tone. If more than one tone with the same absolute deviation is found, pick the first one. If the absolute deviation in pitch is less then 8, link to that tone. | ||
| Line 113: | Line 113: | ||
| ===== Encoding ===== | ===== Encoding ===== | ||
| - | ==== Tone info ==== | + | ==== Tone info header |
| * 1 bit: Chooses high-dynamic-range mode if set, low-dynamic-range mode if clear | * 1 bit: Chooses high-dynamic-range mode if set, low-dynamic-range mode if clear | ||
| - | * symbol from [[tone info trees#bands with tones tree]]: The number of bands tonal data is stored for. | + | * symbol from [[tone info trees#bands with tones tree]] |
| * in two-channel substreams: | * in two-channel substreams: | ||
| - | * 1 bit: If clear, clone information from master to slave for all bands otherwise | + | * 1 bit: If clear, |
| - | * 1 bit: If clear, | + | * 1 bit: If clear, clone information from master to slave for all bands, otherwise |
| * 1 bit per band with tone data: If set, clone data for this band | * 1 bit per band with tone data: If set, clone data for this band | ||
| * 1 bit: If clear, master channel is the left channel for all bands | * 1 bit: If clear, master channel is the left channel for all bands | ||
| Line 135: | Line 135: | ||
| * per-tone data: | * per-tone data: | ||
| * pitches | * pitches | ||
| - | * level | + | * if in HDR mode |
| + | * tone levels (HDR) | ||
| + | * otherwise | ||
| + | * band base levels (LDR) | ||
| + | * tone levels (LDR) | ||
| * phase | * phase | ||
| Line 155: | Line 159: | ||
| * on slave channel | * on slave channel | ||
| * 2 bits: coding mode | * 2 bits: coding mode | ||
| + | * encoded tone counts (see directly below) | ||
| === Coding Mode 0: direct encoding === | === Coding Mode 0: direct encoding === | ||
| Line 170: | Line 175: | ||
| === Coding Mode 3 (slave only): clone master === | === Coding Mode 3 (slave only): clone master === | ||
| * no data | * no data | ||
| + | |||
| + | ==== Tone pitches ==== | ||
| + | * On slave channel only: | ||
| + | * 1 bit: coding mode (master always uses mode 0) | ||
| + | * encoded pitch info (see directly below) | ||
| + | |||
| + | === Coding mode 0: near-direct encoding === | ||
| + | * for each band that has a non-zero tone count: | ||
| + | * if the tone count is bigger than 1: | ||
| + | * 1 bit, chooses " | ||
| + | * for each tone in that band: | ||
| + | * up to ten bits: near-direct encoded pitch. In ascending mode, leading 1 bits of the current tone pitch that were already set in the previous pitch are omitted (note that the count if leading one bits is monotonically increasing). Analogously, | ||
| + | |||
| + | === Coding mode 1: difference-to-master === | ||
| + | * for each tone in each band that has a non-zero tone count: | ||
| + | * symbol from [[tone info trees#tone pitch delta tree]]. | ||
| + | |||
| + | ==== Tone levels (HDR) ==== | ||
| + | * on master channel | ||
| + | * 1 bit: coding mode | ||
| + | * on slave channel | ||
| + | * 2 bits: coding mode | ||
| + | * encoded level info (see directly below) | ||
| + | |||
| + | === Coding mode 0: direct encoding === | ||
| + | * for each tone in each band: | ||
| + | * 6 bits: binary encoded tone level | ||
| + | |||
| + | === Coding mode 1: variable-length encoding === | ||
| + | * for each tone in each band: | ||
| + | * symbol from [[tone info trees#HDR level tree]]. | ||
| + | |||
| + | === Coding mode 2 (slave only): variable-lenght encoded difference to master === | ||
| + | * for each tone in each band: | ||
| + | * symbol from [[tone info trees#HDR level difference tree]]. Use linked tone level or 34 (if not linked) as base. | ||
| + | |||
| + | === Coding mode 3 (slave only): clone master === | ||
| + | * no data | ||
| + | |||
| + | ==== Band base levels (LDR) ==== | ||
| + | * on master channel | ||
| + | * 1 bit: coding mode | ||
| + | * on slave channel | ||
| + | * 2 bits: coding mode | ||
| + | * encoded level info (see directly below) | ||
| + | |||
| + | === Coding mode 0: direct encoding === | ||
| + | * for each band: | ||
| + | * 6 bits: binary encoded base level | ||
| + | |||
| + | === Coding mode 1: variable-length encoding === | ||
| + | * for each band: | ||
| + | * symbol from [[tone info trees#LDR band level tree]]. Add **24** to the symbol number to obtain the real level. | ||
| + | |||
| + | === Coding mode 2 (slave only): variable-lenght encoded difference to master === | ||
| + | * for each band: | ||
| + | * symbol from [[tone info trees# | ||
| + | |||
| + | === Coding mode 3 (slave only): clone master === | ||
| + | * no data | ||
| + | |||
| + | ==== Tone levels (LDR) ==== | ||
| + | * on master channel | ||
| + | * 1 bit: coding mode | ||
| + | * on slave channel | ||
| + | * 2 bits: coding mode | ||
| + | * encoded level info (see directly below) | ||
| + | |||
| + | === Coding mode 0: direct encoding === | ||
| + | * for each tone in each band: | ||
| + | * 4 bits: binary encoded tone level | ||
| + | |||
| + | === Coding mode 1: variable-length encoding === | ||
| + | * for each band: | ||
| + | * if that band has one tone: | ||
| + | * symbol from [[tone info trees# | ||
| + | * otherwise for each tone in that band | ||
| + | * symbol from [[tone info trees#LDR level tree]]. | ||
| + | |||
| + | === Coding mode 2 (slave only): variable-lenght encoded difference to master === | ||
| + | * for each tone in each band: | ||
| + | * symbol from [[tone info trees#HDR level difference tree]]. Use linked tone level or 34 (if not linked) as base. | ||
| + | |||
| + | === Coding mode 3 (slave only): clone master === | ||
| + | * no data | ||
| + | |||
| + | ===== Tone phase ===== | ||
| + | * for each tone in each band: | ||
| + | * 5 bit phase value | ||
atrac3p/serialized_tone_data.1279965720.txt.gz · Last modified: 2010/07/24 10:02 by megadiscman