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afb18e0e31
If stream has HDR10 metadata and HDMI device EDID supports it, this patch will set the DRM properties accordingly. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3303>
112 lines
3.9 KiB
C
112 lines
3.9 KiB
C
/*
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* Copyright © 2008-2011 Kristian Høgsberg
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* Copyright © 2011 Intel Corporation
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* Copyright © 2017, 2018 Collabora, Ltd.
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* Copyright © 2017, 2018 General Electric Company
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* Copyright (c) 2018 DisplayLink (UK) Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <math.h>
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#include "gstkmsedid.h"
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/* from libweston/backend-drm/modes.c unaccepted merge, modified slightly to
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remove non HDR stuff, return -1 if no HDR in EDID.
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https://gitlab.freedesktop.org/jcline/weston/-/commit/b3fa65d19ca60a45d0cc0fc1bfa68eea970344ee
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*/
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#define EDID_OFFSET_EXT_COUNT 0x7E
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#define EDID_EXTENSION_SIZE 0x80
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// Indicates the EDID extension is a CTA extension
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#define EDID_CTA_EXTENSION_TAG 0x02
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// Indicates the data block uses the extended tag field
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#define EDID_CTA_EXTENDED_TAG 0x07
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// Value of the extended tag field for HDR static metadata blocks
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#define EDID_CTA_STATIC_HDR_TAG 0x06
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/* Extract the HDR static metadata from a CTA EDID extension. */
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static int
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gst_kms_parse_hdr_metadata (const uint8_t * cta_ext_data,
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struct gst_kms_hdr_static_metadata *metadata)
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{
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int i, block_len;
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uint8_t cta_revision = cta_ext_data[1];
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uint8_t dtd_offset = cta_ext_data[2];
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const uint8_t *data_blocks = cta_ext_data + 4;
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if (cta_revision != 3) {
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return -1;
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}
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// The data block collection ranges from byte 4 to the dtd_offset; each
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// block begins with the block size (in bytes) in bits 0-4 of the first byte.
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for (i = 0; i < dtd_offset; i += (data_blocks[i] & 0x1f) + 1) {
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if ((data_blocks[i] & 0xe0) >> 5 == EDID_CTA_EXTENDED_TAG) {
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block_len = data_blocks[i] & 0x1f;
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if (data_blocks[i + 1] == EDID_CTA_STATIC_HDR_TAG) {
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if (block_len < 2)
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continue;
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metadata->eotf = data_blocks[i + 2];
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metadata->metadata_type = data_blocks[i + 3];
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if (block_len > 3 && data_blocks[i + 4])
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metadata->max_cll = 50.0 * pow (2, data_blocks[i + 4] / 32.0);
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if (block_len > 4 && data_blocks[i + 5])
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metadata->max_fall = 50.0 * pow (2, data_blocks[i + 5] / 32.0);
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if (block_len > 5)
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metadata->min_cll =
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metadata->max_cll * pow (data_blocks[i + 6] / 255.0, 2) / 100.0;
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return 0;
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}
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}
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}
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return -1;
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}
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int
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gst_kms_edid_parse (struct gst_kms_hdr_static_metadata *metadata,
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const uint8_t * data, size_t length)
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{
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int i;
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const uint8_t *edid_extension;
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/* check header */
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if (length < 128 || length < ((size_t) data[EDID_OFFSET_EXT_COUNT] + 1) * 128)
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return -1;
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if (data[0] != 0x00 || data[1] != 0xff)
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return -1;
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edid_extension = data + 128;
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for (i = 0; i < data[EDID_OFFSET_EXT_COUNT]; i++) {
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switch (edid_extension[0]) {
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case EDID_CTA_EXTENSION_TAG:
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return gst_kms_parse_hdr_metadata (edid_extension, metadata);
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}
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edid_extension += 128;
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}
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return 0;
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}
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/* END from libweston/backend-drm/modes.c unaccepted merge */
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