22 lines
1.2 KiB
Markdown
Executable File
22 lines
1.2 KiB
Markdown
Executable File
## Frame Info exported from libHEVC
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### Introduction
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QP and CU type maps for H265 are defined for each 8x8 coding unit.
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The QP values defined as unsigned 8-bit numbers can range from <1, 51> and CU type can be
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INTER/INTRA/SKIP. HEVC defines them in ihevc_defs.h as PRED_MODE_INTER = 0, PRED_MODE_INTRA = 1
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and PRED_MODE_SKIP = 2.
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Set the “u4_frame_info_enable” flag to enable encoder/decoder to populate and return the qp values
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and CU type data in its output structure ihevcd_cxa_video_decode_op_t via pu1_8x8_blk_qp_map and
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pu1_8x8_blk_type_map.
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### Mapping to the frame
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Within a video sequence, CTUs of a fixed size (16x16, 32x32, or 64x64) can be further divided into
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CUs of size as low as 8x8 pixels. A CU’s number of QP entries (each for 8x8 blocks) can range from
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1 to 64. A frame with a resolution of WdxHt has a total of (align8(Wd) x align8(Ht)) / 64 entries
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for QP and CU type map each. Qp and CU type values for each 8x8 block are stored in raster scan
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order. Refer to ihevcd_cxa.h for details.
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### Plugin/Application
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The encoder/decoder keeps the QP and CU type map as a part of its output handle. The plugins can
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access these data through the output structure.
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