MVD Services
This is for using the MVD hardware video decoder(unknown whether MVD can do more than decoding) + hardware color-format converter. The New_3DS Internet Browser uses mvd:STD for video decoding + YUV2RGB for decoded MJPEG frames.
See here for the supported hardware decoder video codecs.
There can only be one service session open at a time for each individual MVD service.
MVD Service "mvd:STD"
| Command Header | Available since system version | Description |
|---|---|---|
| 0x00010082 | Initialize | |
| 0x00020000 | Shutdown | |
| 0x00030300 | CalculateWorkBufSize | |
| 0x000400C0 | Unknown. Not used by SKATER. | |
| 0x00050100 | (s8 unk0, s8 unk1, s8 unk2, u32 unk3) SKATER uses value 0 for all of these params. | |
| 0x00060000 | Unknown. Not used by SKATER. | |
| 0x00070000 | ||
| 0x00080142 | ProcessNALUnit | |
| 0x00090042 | ControlFrameRendering | |
| 0x000A0000 | GetStatus | |
| 0x000B0000 | GetStatusOther(unknown what this is used for). Same output size as GetStatus. | |
| 0x000C0100 | (u8 unk0, s8 unk1, u32 unk2, u32 unk3) Unknown. Not used by SKATER. | |
| 0x000D0000 | Unknown. Not used by SKATER. | |
| 0x000E0202 | Unknown. Not used by SKATER. The code for this appears to be similar to ProcessNALUnit, this DMAs data from the input buffer as well. | |
| 0x000F0042 | (s8 unk, val0, handle) Unknown. Not used by SKATER. Presumably the command 0x000E0202 version of MVDSTD:ControlFrameRendering. | |
| 0x00100400 | Unknown. Not used by SKATER. | |
| 0x00110000 | Unknown. Not used by SKATER. | |
| 0x001200C0 | (s8 unk0, u32 unk1, u32 unk2) Unknown. Not used by SKATER. | |
| 0x00130000 | Unknown. Not used by SKATER. | |
| 0x001400C2 | Unknown. Not used by SKATER. The code for this appears to be similar to ProcessNALUnit, this DMAs data from the input buffer as well. | |
| 0x00150042 | (s8 unk, val0, handle) Unknown. Not used by SKATER. Presumably the command 0x001400C2 version of MVDSTD:ControlFrameRendering. | |
| 0x00160000 | Unknown. Not used by SKATER. | |
| 0x00170000 | Unknown. Not used by SKATER. | |
| 0x00180000 | Unknown. Used during initialization regardless of the operation mode(color-conversion/video-processing). | |
| 0x00190000 | Unknown. Used during shutdown regardless of the operation mode(color-conversion/video-processing). | |
| 0x001A0000 | Used when doing color-format conversion. | |
| 0x001B0040 | (u8 unknown) SKATER uses value 1 for this. | |
| 0x001C0000 | ||
| 0x001D0042 | GetConfig | |
| 0x001E0044 | SetConfig | |
| 0x001F0902 | Unknown. Not used by SKATER. This appears to write data to the specified output buffers via hardware? | |
| 0x00200002 | (val0, handle) Unknown. Not used by SKATER. This loads data from the table entry which has a field matching an input parameter. This is the table used by command 0x001F0902. | |
| 0x00210100 | (u32 unk0, u32 unk1, u32 unk2, u32 unk3) Unknown. Not used by SKATER. This initializes table data used by command 0x001F0902. |
This one uses the I/O mapped @ 0x10207000.
This service is used by the New_3DS Internet Browser.
By default MVD does(?) various post-processing with the output image, this is controlled by the configuration. This post-processing isn't done at all in certain cases. By default MVD will align the output frame width to 512, by writing zero-value pixels.
Initialization procedures:
- Color-conversion: Use command MVDSTD:Initialize with bufsize=1, then command 0x00180000.
- H.264: If needed, use MVDSTD:CalculateWorkBufSize. Then use MVDSTD:Initialize. Then use commands 0x00050100, 0x00180000, and 0x001B0040. Then use MVDSTD:ProcessNALUnit for each of the individual NAL-unit parameter sets("Sequence Parameter Set" and "Picture Parameter Set"), with the main video processing starting afterwards.
Shutdown procedures:
- Color-conversion: just use command 0x00190000, then MVDSTD:Shutdown.
- H.264: Use command 0x00090042 in a loop, waiting for it to return a retval that isn't 0x00017002. Then use commands 0x001C0000, 0x00190000, and 0x00070000. Then use MVDSTD:Shutdown.
MVD Service "l2b:u"
This one uses the I/O mapped @ 0x10130000.
MVD Service "l2b2:u"
This uses the same command-handler as "l2b:u".
MVD Service "y2r2:u"
This one uses the I/O mapped @ 0x10102000.
MVD Result-codes
| Result-code | Internal MVD status-code | Description |
|---|---|---|
| 0xD961710F | Invalid configuration, mainly when setting the config. | |
| 0x17000 | OK | |
| 0x17002 | Busy. When returned by command 0x00090042 during video processing, SKATER uses the {MVDSTD:GetConfig, MVDSTD:SetConfig, and 0x00090042} commands again(same config as before). The SKATER code for this includes this debug string: "H264 output %lld us corrected to %lld us\n". |
Supported H.264 Levels and Profiles
| Level | Baseline | Main | High | High 10 (High10, High10p, Hi10p or 10-bit H.264) | High 4:2:2 (High422p or High422) | High 4:4:4 Predictive (Hi444PP) |
|---|---|---|---|---|---|---|
| 1 | Yes | Yes | Yes | Yes | Untested | Untested |
| 1b | Yes | Yes | Yes | Yes | Untested | Untested |
| 1.1 | Yes | Yes | Yes | Yes | Untested | Untested |
| 1.2 | Yes | Yes | Yes | Yes | Untested | Untested |
| 1.3 | Yes | Yes | Yes | Yes | Untested | Untested |
| 2 | Yes | Yes | Yes | Yes | Untested | Untested |
| 2.1 | Yes | Yes | Yes | Yes | Untested | Untested |
| 2.2 | Yes | Yes | Yes | Yes | Untested | Untested |
| 3 | Yes | Yes | Yes | Yes | Untested | Untested |
| 3.1 | Yes | Yes | Yes | Yes | Untested | Untested |
| 3.2 | Yes | Yes | Yes | Yes | Untested | Untested |
| 4 | No (untested) | No (untested) | No (untested) | No (untested) | No (untested) | No (untested) |
| 4.1 | No (untested) | No (untested) | No (untested) | No (untested) | No (untested) | No (untested) |
| 4.2 | No (untested) | No (untested) | No (untested) | No (untested) | No (untested) | No (untested) |
| 5 | No (untested) | No (untested) | No (untested) | No (untested) | No (untested) | No (untested) |
| 5.1 | No (untested) | No (untested) | No (untested) | No (untested) | No (untested) | No (untested) |
| 5.2 | No (untested) | No (untested) | No (untested) | No (untested) | No (untested) | No (untested) |
created using the New 3DS Internet Browser, New 3DS Internet Browser Specs and the following test pages:
Baseline Profile Test
Main Profile Test
High Profile Test
High10 Profile Test