GRC services

GRC (Game Recording) uses libstagefright and the NvMMLite TVMR library for writing recorded video to MP4s.

Error reporting is done using the new /dev/nverpt-ctrl ioctls.

grc:c

This is "nn::grcsrv::IGrcService".

Cmd	Name	Notes
1	OpenContinuousRecorder	Takes a total of 0x28-bytes of input and a handle, returns an #IContinuousRecorder.
2	OpenGameMovieTrimmer	Takes an input u64 and a handle, returns an #IGameMovieTrimmer.
3	[5.0.0+]	Takes a total of 0x8-bytes of input and a handle, returns an #IOffscreenRecorder.
101	[5.0.0+]	Takes a total of 0x10-bytes of input, returns an #IMovieMaker.
9903	[5.0.0+]	Takes 8-bytes of input, no output.

[5.0.0+] OpenContinuousRecorder now takes an additional 0x20-bytes of input.

IContinuousRecorder

This is "nn::grcsrv::IContinuousRecorder".

Cmd	Name
1
2
10
11
12
13
14	[5.0.0+]

[5.0.0+] Cmd11 now takes a total of 0x40-bytes of input.

[8.0.0+] Cmd11/cmd14 no longer take any rawdata input, these now take a type-0x15 input buffer.

IGameMovieTrimmer

This is "nn::grcsrv::IGameMovieTrimmer".

Cmd	Name
1	#BeginTrim
2	#EndTrim
10	#GetNotTrimmingEvent
20	#SetThumbnailRgba

Album uses CreateGameMovieTrimmer, and retries using the cmd in a loop on error 0x8D4 with svcSleepThread(100000000) being used first. Then all 4 of these commands are used in that same func: #SetThumbnailRgba if the input buffer is set, #GetNotTrimmingEvent, #BeginTrim, waits on the event, then #EndTrim and cleanup.

BeginTrim

Takes an input s32 start, a s32 end, and a #GameMovieId, no output.

The two s32s are the start/end timestamps in 0.5s units.

EndTrim

No input, returns an output #GameMovieId.

This just loads the #GameMovieId from state, when available.

GetNotTrimmingEvent

No input, returns an output Event handle with autoclear=false.

SetThumbnailRgba

Takes a type-0x45 input buffer, a s32 width, and a s32 height, no output.

width must be 1280, height must be 720, and the buffer size must be at least 0x384000. After this validation, this just copies the input buffer to state with size 0x384000 and returns 0.

grc:d

This is "nn::grcsrv::IRemoteVideoTransfer".

Added with 6.0.0.

Cmd	Name	Notes
1		No input/output.
2		Takes an input u32 (must be value 0-1) and a type-0x6 output buffer, returns a total of 0x10-bytes of output.

Cmd1

Begins video stream. This must not be used more than once, even from a different service session: otherwise the sysmodule will assert.

Cmd2

Retrieves stream data, from the video recording being done of the currently running game title. Takes u32 "stream" (0: video, 1: audio), returns u32 (num_frames?), u32 data_size, u64 (start_timestamp?). Video stream writes H.264 NAL units to the output buffer (try ffplay -f h264). Audio stream is PCM16, 2 channels, and sample-rate = 48000Hz. Official code uses buffer size 0x32000 for video, 0x1000 for audio, and multiple threads to read out both streams at the same time.

This will block until data is available. This will hang if there is no game title running which has video capture enabled.

IOffscreenRecorder

This is "nn::grcsrv::IOffscreenRecorder".

This was added with [5.0.0+].

Cmd	Name	Notes
201		Takes a total of 0x8-bytes of input, returns a total of 0x8-bytes of output.
202		Takes a total of 0x8-bytes of input, no output.

IMovieMaker

This is "nn::grcsrv::IMovieMaker".

This was added with [5.0.0+].

Cmd	Name
2	#CreateVideoProxy
9	[7.0.0+] #SetAlbumShimLibraryVersion
10	#OpenOffscreenLayer
11	#CloseOffscreenLayer
20	#StartOffscreenRecording
21	#AbortOffscreenRecording
22	#RequestOffscreenRecordingFinishReady
23	#CompleteOffscreenRecordingFinish
24	#StartOffscreenRecordingEx
25	#CompleteOffscreenRecordingFinishEx0
26	[7.0.0+] #CompleteOffscreenRecordingFinishEx1
30	#GetOffscreenLayerError
41	#EncodeOffscreenLayerAudioSample
50	#GetOffscreenLayerRecordingFinishReadyEvent
52	#GetOffscreenLayerAudioEncodeReadyEvent

CreateVideoProxy

No input, returns an #IHOSBinderDriver.

SetAlbumShimLibraryVersion

Takes an input u64 ShimLibraryVersion, no output.

OpenOffscreenLayer

Takes an input u64 LayerHandle, returns an output s32 ID.

This gets the ID for the #IHOSBinderDriver returned by #CreateVideoProxy.

CloseOffscreenLayer

Takes an input u64 LayerHandle, no output.

StartOffscreenRecording

Takes an input u64, no output.

Seems to be unused by official user processes, #StartOffscreenRecordingEx is used instead.

AbortOffscreenRecording

Takes an input u64 LayerHandle, no output.

RequestOffscreenRecordingFinishReady

Takes an input u64 LayerHandle, no output.

StartOffscreenRecordingEx

Takes an input u64 LayerHandle and an #OffscreenRecordingParameter, no output.

CompleteOffscreenRecordingFinish

Takes an input u64 LayerHandle and a type-0x5 input buffer, no output.

Seems to be unused by official user processes, #CompleteOffscreenRecordingFinishEx0 is used instead.

CompleteOffscreenRecordingFinishEx0

Takes two input u32s width/height, an input u64 LayerHandle and 2 type-0x5 input buffers, no output.

The input buffers are optional, addr=NULL and size=0 can be used for these.

width/height must be 1280x720, these fields are unused afterwards.

Besides width/height, this is the same as #CompleteOffscreenRecordingFinish except the second buffer is user-specified instead of addr=NULL/size=0.

CompleteOffscreenRecordingFinishEx1

Takes two input u32s width/height, an input u64 LayerHandle and two type-0x5 input buffers, returns a 0x20-byte output struct.

Same as #CompleteOffscreenRecordingFinishEx0 except the output struct is returned in the cmdreply.

EncodeOffscreenLayerAudioSample

Takes an input u64 LayerHandle and a type-0x5 input buffer, returns an output u64.

GetOffscreenLayerError

Takes an input u64 LayerHandle, no output.

GetOffscreenLayerRecordingFinishReadyEvent

Takes an input u64 LayerHandle, returns an output event handle with autoclear disabled.

GetOffscreenLayerAudioEncodeReadyEvent

Takes an input u64 LayerHandle, returns an output event handle with autoclear disabled.

OffscreenRecordingParameter

This is a 0x80-byte struct.

GameMovieId

Offset	Size	Description
0x0	0x18	Same as the last 0x18-bytes of AlbumEntry.
0x18	0x28	Unused, always zero.

This is "nn::grcsrv::GameMovieId". This is a 0x40-byte struct.

IHOSBinderDriver

This is the same interface as NV IHOSBinderDriver.