60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
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#ifndef LCAMERA_BUFF_PIXEL_AND_COLOR_FORMAT_DECISIONS_H
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#define LCAMERA_BUFF_PIXEL_AND_COLOR_FORMAT_DECISIONS_H
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#include <cameraModeRequest.h>
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#include <cstddef>
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/**
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* Y/U/V channel sizing for lcameraBuff.
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*
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* lcameraBuff exports three quale ifaces (colour-yuv-y/u/v), each backed by a
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* separate deinterleaved channel buffer. libcamera, however, negotiates a single
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* configured pixel format (YUYV, NV12, YUV420, etc.) that may be packed or
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* multi-plane. This module bridges that gap at attach time: it classifies the
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* configured fourcc into a chroma subsampling family (420 / 422 / 444) and
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* computes how many bytes each deinterleaved Y, U, or V plane needs for the
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* negotiated width and height.
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*
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* What it provides to the stimbuff:
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* - YuvChromaSubsampling on YuvStimProducer (derived from configured mode)
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* - channelByteSize for each YuvChannelStimulusBuffer / StagingBuffer mmap
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*
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* Capture layout (packed vs planar, direct vs deinterleaved backing) is handled
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* separately by yuvCaptureLayout.h; this module is only plane geometry and
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* byte counts. Future capture/deinterleave stages must write into buffers sized
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* by these functions.
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*/
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namespace smo {
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namespace stim_buff {
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namespace lcamera_buff {
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enum class YuvChannelKind
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{
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Y,
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U,
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V,
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};
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enum class YuvChromaSubsampling
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{
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Yuv420,
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Yuv422,
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Yuv444,
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};
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YuvChromaSubsampling classifyYuvChromaSubsampling(
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const lcamera_dev::LcameraDevConfiguredCameraMode& configuredMode);
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size_t computeDeinterleavedChannelByteSize(
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YuvChannelKind channel,
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unsigned width,
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unsigned height,
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YuvChromaSubsampling subsampling);
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} // namespace lcamera_buff
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} // namespace stim_buff
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} // namespace smo
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#endif // LCAMERA_BUFF_PIXEL_AND_COLOR_FORMAT_DECISIONS_H
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