CSNG (File Format): Difference between revisions
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imported>Jackoalan |
imported>Jackoalan |
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| (2 intermediate revisions by the same user not shown) | |||
| Line 104: | Line 104: | ||
| 0x8 | | 0x8 | ||
| 2 | | 2 | ||
| '''Region Data Index'''; used to select region data | | '''Region Data Index'''; used to select region data when positive; -1 value terminates track; -2 value loops jumps to ''Loop Region Index'' at this region's tick | ||
|- | |- | ||
| 0xA | | 0xA | ||
| 2 | | 2 | ||
| '''Loop Region Index'''; index of region to jump to if ''Region Data Index'' set to -2 | |||
|- | |- | ||
| 0xC | | 0xC | ||
| Line 147: | Line 147: | ||
in SNG: ''note'', ''control change'', and ''program change''. | in SNG: ''note'', ''control change'', and ''program change''. | ||
=====Delta Time | =====Delta Time Encoding===== | ||
Just like MIDI, each command starts with a '''delta time''' value telling the sequencer | Just like MIDI, each command starts with a '''delta time''' value telling the sequencer | ||
| Line 266: | Line 266: | ||
(0x80). The decoder must track the absolute time and value, summing each consecutive update | (0x80). The decoder must track the absolute time and value, summing each consecutive update | ||
for the current time/values. | for the current time/values. | ||
The byte sequence 0x80 0x00 is a special case that signals the end of the stream. | |||
Similar to the command stream, when the delta time exceeds 15 bit range (>32767), extra pairs | Similar to the command stream, when the delta time exceeds 15 bit range (>32767), extra pairs | ||
| Line 296: | Line 298: | ||
ret = [0,0] | ret = [0,0] | ||
while ret[1] == 0: | while ret[1] == 0: | ||
if streamIn.PeekU16() == 0x8000: | |||
# The stream has ended | |||
break | |||
ret[0] += DecodeUnsignedValue(streamIn) | ret[0] += DecodeUnsignedValue(streamIn) | ||
ret[1] = DecodeSignedValue(streamIn) | ret[1] = DecodeSignedValue(streamIn) | ||