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mLine 3:
Line 3: + − + − The mixer has 24 channels, each of which are individually configurable.+ + + + + + + + + + + + + + + − {| class="wikitable"+ − |-+ − | Structure Number+ − | DSP memory address − | Size − | Description − |- − | 5 − | 0x8400 − | 0x20 − | Status (?) − |- − | 9 − | 0x8410 − | 0x260 − | Debug (?) − |- − | 6 − | 0x8540 − | 0x280 − | Loopback Samples (PCM16) − |- − | 2 − | 0x8680 − | 0x120 − | Channel Status (x24) − |- − | 8 − | 0x9710 − | 0x1A40 − | ? − |- − | 4 − | 0x9430 − | 0xC4 − | Main Configuration − |- − | 7 − | 0x9492 − | 0x1400 − | ? − |- − | 1 − | 0x9e92 − | 0x1200 − | Channel Config (x24) − |- − | 3 − | 0x9430 − | 0x300 − | GC-ADPCM Coefficients (x24) − |- − | 10 − | 0xa912 − | 0x200 − | − |- − | 11 − | 0xaa12 − | 0x180 − | − |- − | 12 − | 0xaad2 − | 0x300 − | − |- − | 13 − | 0xac52 − | 0x14 − | − |- − | 14 − | 0xac5c − | 0x2476 − | - − |- − | 0 − | 0xbfff − | 0x2 − | Frame Counter − |} Line 207:
Line 143: − + + + − + − + + − + − + + − + − + − + − | 13 − | Is Active − |- − | 18 − | Interpolation Type − |- − | 19 − | Rate − |- − | 20 − | Buffer Queue − |- − | 22 − | Embedded buffer − |- − | 23 − | IRR Filter Type − |- − | 25 − | Sync Count − |- − | 26-28 − | Mix − |- − | 30 − | First time init − |- − | 31 − | Embedded Buffer
no edit summary
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*Note that everything below will vary depending on the exact DSP firmware used and different variants have slightly different behaviours.*
The DSP communicates with userland through memory locations 0x1ff40000-0x1ff77fff. Within this region are two areas of structures that are exact duplicates of each other. The DSP alternates between the use of these two areas (much like a double-buffer). Each area has 15 structures within it. The location of these structures can be obtained by [[DSP:ReadPipe|reading channel 2 of the DSP pipe]].
The DSP communicates with the application through two shared memory areas 0x8000 bytes long each (at 0x1FF50000 and 0x1FF70000 respectively). The DSP alternates between the use of these two areas (much like a double-buffer). Each area has 15 structures within it. The location of these structures can be obtained by [[DSP:ReadPipe|reading channel 2 of the DSP pipe]]. A list of structures in the order the DSP addresses are read from the pipe follows:
1. Frame count
2. Input configurations
3. Input status
4. Input ADPCM coefficients
5. DSP configuration
6. DSP status
7. Output samples
8. Intermediate mix samples
9. Unknown Coefficients
10. DSP debug statistics
11. Unknown Coefficients
12. Unknown Coefficients
13. Unknown Coefficients
14. Unknown Coefficients
15. Unknown Coefficients
The DSP has 24 inputs, each of which are individually configurable. These 24 inputs each produce three sets of 4 audio channels (two left, two right).
These four audio channels feed into three intermediate mixers. Two of these intermediate mixers are used for effects and aux.
== Channel Config ==
== Channel Config ==
|}
|}
=== Dirty Bits ===
=== Simple Filter Configuration ===
This is a standard single-pole filter. The fall-off is 6dB per octave as you would expect.
{| class="wikitable"
{| class="wikitable"
|-
|-
| Bit
| Offset
| What Changed
| Type
| Description
|-
|-
| 3
| 0
| ADPCM Coefficients
| s16
| b0
|-
|-
| 5
| 0
| Embedded buffer
| s16
|-
| a1
|}
|}