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OBD:SNDD/aif: Difference between revisions
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replaced formula GIFs with Math markup; replaced nowiki tags around equals signs with new {{=}} magic word
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{{OBDth}} | {{OBDth}} | ||
{{OBDtr| 0x00 | char[4] |FF0000| 46 4F 52 4D | FORM | identifier for the "EA IFF 85" standard }} | {{OBDtr| 0x00 | char[4] |FF0000| 46 4F 52 4D | FORM | identifier for the "EA IFF 85" standard }} | ||
{{OBDtr| 0x04 | int32 |FFFF00| 00 00 2A 90 | 10896 | size of the file from 0x08 to the end ( | {{OBDtr| 0x04 | int32 |FFFF00| 00 00 2A 90 | 10896 | size of the file from 0x08 to the end ({{=}} size of the raw IMA4 data + 50 bytes) }} | ||
{{OBDtr| 0x08 | char[4] |00FF00| 41 49 46 43 | AIFC | identifier for the "AIFC" format (compressed aif file) }} | {{OBDtr| 0x08 | char[4] |00FF00| 41 49 46 43 | AIFC | identifier for the "AIFC" format (compressed aif file) }} | ||
{{OBDtr| 0x0C | char[4] |00FFFF| 43 4F 4D 4D | COMM | identifier announcing the following aif format header (COMM stands for "common")}} | {{OBDtr| 0x0C | char[4] |00FFFF| 43 4F 4D 4D | COMM | identifier announcing the following aif format header (COMM stands for "common")}} | ||
{{OBDtr| 0x10 | block[26]|FFC8C8| | | COMM data (a.k.a. AIFC format header, similar to a WAVE file's "fmt"; see below) }} | {{OBDtr| 0x10 | block[26]|FFC8C8| | | COMM data (a.k.a. AIFC format header, similar to a WAVE file's "fmt"; see below) }} | ||
{{OBDtr| 0x2A | char[4] |FFFFC8| 53 53 4E 44 | SSND | identifier announcing the following aif data (actual stream + stream size + 2 more parameters) }} | {{OBDtr| 0x2A | char[4] |FFFFC8| 53 53 4E 44 | SSND | identifier announcing the following aif data (actual stream + stream size + 2 more parameters) }} | ||
{{OBDtr| 0x2E | int32 |C8FFC8| 00 00 2A 66 | 10854 | size of the following SSND data ( | {{OBDtr| 0x2E | int32 |C8FFC8| 00 00 2A 66 | 10854 | size of the following SSND data ({{=}} size of the raw IMA4 data + 8 bytes) | ||
:(since SSND is the last section, this is also the remaining file size, from 0x32 to the end) }} | :(since SSND is the last section, this is also the remaining file size, from 0x32 to the end) }} | ||
{{OBDtr| 0x32 | int32 |C8FFFF| 00 00 00 00 | 0 | "offset"; determines where the first sample in the data starts; typically zero }} | {{OBDtr| 0x32 | int32 |C8FFFF| 00 00 00 00 | 0 | "offset"; determines where the first sample in the data starts; typically zero }} | ||
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Here is the detail of the format header at 0x10: | Here is the detail of the format header at 0x10: | ||
[[ | [[Image:sndd_hdm.gif]] | ||
{{Table}} | {{Table}} | ||
{{OBDth}} | {{OBDth}} | ||
{{OBDtr| 0x10 | int32 |FFC8C8| 00 00 00 16 | 22 | size of the following COMM data (AIFC format settings) }} | {{OBDtr| 0x10 | int32 |FFC8C8| 00 00 00 16 | 22 | size of the following COMM data (AIFC format settings) }} | ||
{{OBDtr| 0x14 | int16 |FFFFC8| 00 01 | 1 | number of channels (1 | {{OBDtr| 0x14 | int16 |FFFFC8| 00 01 | 1 | number of channels (1 {{=}} mono) }} | ||
{{OBDtr| 0x16 | int32 |C8FFC8| 00 00 01 3F | 319 | | {{OBDtr| 0x16 | int32 |C8FFC8| 00 00 01 3F | 319 | number of frames: <math>\frac{\text{size of the part in the raw file}}{\text{number of channels}*34}</math> }} | ||
{{OBDtr| 0x1A | int16 |C8FFFF| 00 10 | 16 | bits per sample }} | {{OBDtr| 0x1A | int16 |C8FFFF| 00 10 | 16 | bits per sample }} | ||
{{OBDtr| 0x1C | float80 |FFC8FF| 40 0D AC... | 22050 | samples per second (a.k.a. "frequency" or "sample rate") | {{OBDtr| 0x1C | float80 |FFC8FF| 40 0D AC... | 22050 | samples per second (a.k.a. "frequency" or "sample rate") | ||
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At 0x3A start the IMA4 frames, each of them 34 bytes long and coding for 64 samples. Here is a view of a stereo .aif file (based on Oni's SNDDalarm_loop.aif), showing how the IMA4 frames are organized. | At 0x3A start the IMA4 frames, each of them 34 bytes long and coding for 64 samples. Here is a view of a stereo .aif file (based on Oni's SNDDalarm_loop.aif), showing how the IMA4 frames are organized. | ||
[[ | [[Image:sndm_aif2.gif]] | ||
{{Table}} | {{Table}} | ||
{{OBDth}} | {{OBDth}} | ||
{{OBDtr| 0x00 | char[4] |FF0000| 46 4F 52 4D | FORM | identifier for the "EA IFF 85" standard }} | {{OBDtr| 0x00 | char[4] |FF0000| 46 4F 52 4D | FORM | identifier for the "EA IFF 85" standard }} | ||
{{OBDtr| 0x04 | int32 |FFFF00| 00 01 16 4E | 71246 | size of the file from 0x08 to the end ( | {{OBDtr| 0x04 | int32 |FFFF00| 00 01 16 4E | 71246 | size of the file from 0x08 to the end ({{=}} size of the raw IMA4 data + 50 bytes) }} | ||
{{OBDtr| 0x08 | char[4] |00FF00| 41 49 46 43 | AIFC | identifier for the "AIFC" format (compressed aif file) }} | {{OBDtr| 0x08 | char[4] |00FF00| 41 49 46 43 | AIFC | identifier for the "AIFC" format (compressed aif file) }} | ||
{{OBDtr| 0x0C | char[4] |00FFFF| 43 4F 4D 4D | COMM | identifier announcing the following aif format header (COMM stands for "common")}} | {{OBDtr| 0x0C | char[4] |00FFFF| 43 4F 4D 4D | COMM | identifier announcing the following aif format header (COMM stands for "common")}} | ||
{{OBDtr| 0x10 | int32 |FFC8C8| 00 00 00 16 | 22 | size of the following COMM data (AIFC format settings) }} | {{OBDtr| 0x10 | int32 |FFC8C8| 00 00 00 16 | 22 | size of the following COMM data (AIFC format settings) }} | ||
{{OBDtr| 0x14 | int16 |FFFFC8| 00 02 | 2 | number of channels (2 | {{OBDtr| 0x14 | int16 |FFFFC8| 00 02 | 2 | number of channels (2 {{=}} stereo) }} | ||
{{OBDtr| 0x16 | int32 |C8FFC8| 00 00 04 17 | 1047 | | {{OBDtr| 0x16 | int32 |C8FFC8| 00 00 04 17 | 1047 | number of frames: <math>\frac{\text{size of the part in the raw file}}{\text{number of channels}*34}</math> }} | ||
{{OBDtr| 0x1A | int16 |C8FFFF| 00 10 | 16 | bits per sample }} | {{OBDtr| 0x1A | int16 |C8FFFF| 00 10 | 16 | bits per sample }} | ||
{{OBDtr| 0x1C | float80 |FFC8FF| 40 0D AC... | 22050 | samples per second (a.k.a. "frequency" or "sample rate") | {{OBDtr| 0x1C | float80 |FFC8FF| 40 0D AC... | 22050 | samples per second (a.k.a. "frequency" or "sample rate") | ||
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{{OBDtr| 0x26 | char[4] |FFC800| 69 6D 61 34 | ima4 | compression type }} | {{OBDtr| 0x26 | char[4] |FFC800| 69 6D 61 34 | ima4 | compression type }} | ||
{{OBDtr| 0x2A | char[4] |00FFC8| 53 53 4E 44 | SSND | identifier announcing the following aif data (actual stream + stream size + 2 more parameters) }} | {{OBDtr| 0x2A | char[4] |00FFC8| 53 53 4E 44 | SSND | identifier announcing the following aif data (actual stream + stream size + 2 more parameters) }} | ||
{{OBDtr| 0x2E | int32 |FF00C8| 00 01 16 24 | 71204 | size of the following SSND data ( | {{OBDtr| 0x2E | int32 |FF00C8| 00 01 16 24 | 71204 | size of the following SSND data ({{=}} size of the raw IMA4 data + 8 bytes) | ||
:(since SSND is the last section, this is also the remaining file size, from 0x32 to the end) }} | :(since SSND is the last section, this is also the remaining file size, from 0x32 to the end) }} | ||
{{OBDtr| 0x32 | int32 |C8FF00| 00 00 00 00 | 0 | "offset"; determines where the first sample in the data starts; typically zero }} | {{OBDtr| 0x32 | int32 |C8FF00| 00 00 00 00 | 0 | "offset"; determines where the first sample in the data starts; typically zero }} | ||
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*For the stereo example, there are 1047 frames of 68 bytes each (a stereo frame is the combination of a Left frame and a Right frame), or 71196 bytes (8 bytes less than 0x11624, 50 bytes less than 0x1164E). | *For the stereo example, there are 1047 frames of 68 bytes each (a stereo frame is the combination of a Left frame and a Right frame), or 71196 bytes (8 bytes less than 0x11624, 50 bytes less than 0x1164E). | ||
The SNDD file in .dat receives the offset to the .raw data as well as several parameters that depend on the engine version. | The SNDD file in .dat receives the offset to the .raw data as well as several parameters that depend on the engine version. | ||
===Filling in Mac SNDD=== | ===Filling in Mac SNDD=== | ||
Here is how the SNDD instance should look (in .dat) for the above mono example: | Here is how the SNDD instance should look (in .dat) for the above mono example: | ||
[[ | [[Image:sndd_alm.gif]] | ||
*The "compressed" flag is set (because IMA4 is a compressed format; however, if the flag isn't set, the Mac engine will process the data as IMA4 anyway). | *The "compressed" flag is set (because IMA4 is a compressed format; however, if the flag isn't set, the Mac engine will process the data as IMA4 anyway). | ||
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Here is how the SNDD instance looks (in an .oni file) for the above stereo example: | Here is how the SNDD instance looks (in an .oni file) for the above stereo example: | ||
[[ | [[Image:sndd_alm2.gif]] | ||
Same as above, except: | Same as above, except: | ||
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Here is how the PC retail SNDD instance will look (in an .oni file) for the above stereo example: | Here is how the PC retail SNDD instance will look (in an .oni file) for the above stereo example: | ||
[[ | [[Image:sndd_alm4.gif]] | ||
All the fields can be zeroed out or filled with garbage, except: | All the fields can be zeroed out or filled with garbage, except: | ||