Difference between revisions of "ADPCM Functions"
From Archaic Pixels
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| − | ! | + | ! [color=red]char[/color] ad_read([color=blue]int[/color] ad_addr, [color=red]char[/color] mode, [color=blue]int[/color] buf, [color=blue]int[/color] bytes); [b][ 3.21+ ][/b] |
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2-6 Directly into memory mapped to MMR #'mode' | 2-6 Directly into memory mapped to MMR #'mode' | ||
0xFF Offset in video ram. | 0xFF Offset in video ram. | ||
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Non-zero return values indicate errors. | Non-zero return values indicate errors. | ||
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== ad_write == | == ad_write == | ||
Revision as of 17:43, 13 September 2010
Contents
ADPCM Functions
ad_reset
| void ad_reset(void); [ 3.02+ ] |
|---|
Resets ADPCM hardware. |
ad_stop
| void ad_stop(void); [ 3.21+ ] |
|---|
Stop playing adpcm. |
ad_stat
| int ad_stat(void); [ 3.21+ ] |
|---|
Returns current adpcm status. Return FALSE(0) if adpcm
playing isn't in progress else non zero value.
|
ad_trans
| char ad_trans(int ovl_index, int sect_offset, char nb_sectors, int ad_addr); [ 3.21+ ] |
|---|
Transfer data from CDROM into adpcm buffer. Read it from the overlay segment specified by 'ovl_idx', with sector
offset (ie. multiples of 2048 bytes) of 'sect_offset'.
Read 'nb_sectors' sectors and store data into adpcm buffer starting
from offset 'ad_addr'.
Non-zero return values indicate errors. |
ad_read
| char ad_read(int ad_addr, char mode, int buf, int bytes); [ 3.21+ ] |
|---|
Read data from the adpcm buffer.
Read 'bytes' bytes starting at offset 'ad_addr' in adpcm buffer.
The mode 'mode' determines the meaning of the 'buf' offset.
Valid modes Meaning of 'buf'
----------- ----------------
0 Offset in the mapped ram.
2-6 Directly into memory mapped to MMR #'mode'
0xFF Offset in video ram.
Non-zero return values indicate errors. |
ad_write
| ??? ad_write(int ad_addr, char mode, int buf, int bytes); [ 3.21+ ] |
|---|
Write data into the adpcm buffer.
Write 'bytes' bytes starting at offset 'ad_addr' in adpcm buffer.
The mode 'mode' determines the meaning of the 'buf' offset.
Valid modes Meaning of 'buf'
----------- ----------------
0 Offset in the mapped ram.
2-6 Directly into memory mapped to MMR #'mode'
0xFF Offset in video ram.
Non-zero return values indicate errors.
|
ad_play
| ??? ad_play(int ad_addr, int bytes, char freq, char mode); [ 3.21+ ] |
|---|
Play adpcm sound from data loaded in the adpcm buffer.
Start playing from 'ad_addr' offset in the adpcm buffer, for 'bytes' bytes.
The frequency used for playback is computed from 'freq' using the
following formula : real_frequency_in_khz = 32 / (16 - 'freq'). Valid range
for 'freq' is 0-15.
If bit 0 of 'mode' is on, values of 'ad_addr', 'bytes' and 'freq' from
the previous ad_play call are reused.
If bit 7 of 'mode' is on, playback loops instead of stopping at the end
of the range.
|
