Seeed Studio AI Skills Cv181x Media

CV181X/CV182X/CV180X Multimedia Skill

Instructions

Step 1: Confirm the missing context before giving exact API guidance

When the user asks about exact API behavior, limits, struct fields, or error diagnosis, first confirm the available context:

• Target chip or board model
• SDK version or SDK source tree path
• Relevant code snippet, pipeline stage, or runtime log

If required context is missing:

• State that the answer is limited or provisional
• Ask for the specific missing artifact needed to verify the claim
• Do not present SDK-version-specific behavior as universal unless it is confirmed in the available references

Step 2: Prefer authoritative sources

Use the source order already defined in this skill: SDK headers first, SDK samples second, external material only if it is verified against the headers or samples

Complete Reference Index

All 18 reference files with searchable keywords:

Quick Lookup

By Task

By Error Code

By Pipeline

Private Operating Procedures

1. Authoritative Source Order

1. SDK headers in cvi_mpi/include/
2. SDK samples in cvi_mpi/sample/
3. Never: external repos without header verification

2. VPSS Input Ownership

• VPSS group for ONE input type: ISP or MEM
• Never switch between Bind and SendFrame at runtime
• Concurrent ISP + MEM: separate groups and VB pools

3. VI-VPSS Mode Selection

4. Binding Requirements

• Control plane: CVI_SYS_Bind establishes relationship
• Data plane: Mode setting determines data flow
• Binding required even in ISP direct mode
• Unbind before stop; bind after start

5. Camera Readiness

• Warm up pipeline after start
• Discard first few frames before capture

6. VENC SendFrame Memory

• Must use VB pool, not raw ION
• Use CVI_VB_GetBlock(), set frame.u32PoolId

7. Diagnostics

On failure: /proc/cvitek/{sys,vb,vi,vpss,vdec,venc}

Module Init Order

1. CVI_VB_SetConfig + CVI_VB_Init
2. CVI_SYS_Init
3. CVI_SYS_SetVIVPSSMode
4. CVI_SYS_SetVPSSModeEx
5. VI: sensor -> mipi -> dev -> pipe -> isp -> chn
6. VPSS: CreateGrp -> SetChnAttr -> EnableChn -> StartGrp
7. CVI_SYS_Bind
8. Warmup

VPSS Mode Reference

VPSS_MODE_DUAL

DEV0 = VPSS_INPUT_MEM   -> Offline (SendFrame)
DEV1 = VPSS_INPUT_ISP   -> Camera (Bind)

VpssDev Selection

VB Pool Sizing

Size = COMMON_GetPicBufferSize(w, h, fmt, DATA_BITWIDTH_8, COMPRESS_MODE_NONE, 0)

Counts: Camera=4-6, VPSS=3-4, Encode=2-3, Decode=4-6

Debug Commands

cat /proc/cvitek/sys | grep -A 10 "BIND RELATION"
cat /proc/cvitek/vb | grep -A 20 "PoolId"
cat /proc/cvitek/vi | grep -A 5 "VI CHN STATUS"
cat /proc/cvitek/vpss | grep -A 20 "WORK STATUS"
echo "VI=7" > /proc/cvitek/log

Version: 2.4.0 | Updated: 2026-01-20 | Platform: SG200X

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