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authorjoevt <joevt@shaw.ca>2021-09-26 01:33:20 -0700
committerHans Verkuil <hverkuil-cisco@xs4all.nl>2021-09-27 12:39:41 +0200
commit48a7066e8ee2f52c8971de2f4211f82e10519fee (patch)
tree158f44a63764a74abbffe22558791ac1abbf70d2 /parse-displayid-block.cpp
parentcfb754f9b41ddb18ce18eaa25cf1554527a217e4 (diff)
edid-decode: remove offset from displayid_block
Change the function so that x points to the start of the DisplayID block. Signed-off-by: Joe van Tunen <joevt@shaw.ca> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Diffstat (limited to 'parse-displayid-block.cpp')
-rw-r--r--parse-displayid-block.cpp136
1 files changed, 68 insertions, 68 deletions
diff --git a/parse-displayid-block.cpp b/parse-displayid-block.cpp
index 0a996bd..17f1805 100644
--- a/parse-displayid-block.cpp
+++ b/parse-displayid-block.cpp
@@ -1651,10 +1651,10 @@ void edid_state::preparse_displayid_block(const unsigned char *x)
}
}
-unsigned edid_state::displayid_block(const unsigned version, const unsigned char *x, unsigned offset, unsigned length)
+unsigned edid_state::displayid_block(const unsigned version, const unsigned char *x, unsigned length)
{
unsigned i;
- unsigned tag = x[offset];
+ unsigned tag = x[0];
unsigned oui = 0;
switch (tag) {
@@ -1698,7 +1698,7 @@ unsigned edid_state::displayid_block(const unsigned version, const unsigned char
case 0x7f: // DisplayID 1.3
if ((tag == 0x7e && version >= 0x20) ||
(tag == 0x7f && version < 0x20)) {
- oui = (x[offset + 3] << 16) + (x[offset + 4] << 8) + x[offset + 5];
+ oui = (x[3] << 16) + (x[4] << 8) + x[5];
const char *name = oui_name(oui);
bool reversed = false;
@@ -1732,14 +1732,14 @@ unsigned edid_state::displayid_block(const unsigned version, const unsigned char
if (length < 3) {
// report a problem when the remaining bytes are not 0.
- if (tag || x[offset + 1]) {
+ if (tag || x[1]) {
fail("Not enough bytes remain (%d) for a DisplayID data block or the DisplayID filler is non-0.\n", length);
}
return 0xff;
}
- unsigned block_rev = x[offset + 1] & 0x07;
- unsigned len = x[offset + 2];
+ unsigned block_rev = x[1] & 0x07;
+ unsigned len = x[2];
if (length < len + 3) {
fail("The length of this DisplayID data block (%d) exceeds the number of bytes remaining (%d).\n", len + 3, length);
@@ -1748,7 +1748,7 @@ unsigned edid_state::displayid_block(const unsigned version, const unsigned char
if (!tag && !len) {
// A Product Identification Data Block with no payload bytes is not valid - assume this is the end.
- if (!memchk(x + offset, length)) {
+ if (!memchk(x, length)) {
fail("Non-0 filler bytes in the DisplayID block.\n");
}
return 0xff;
@@ -1757,133 +1757,133 @@ unsigned edid_state::displayid_block(const unsigned version, const unsigned char
printf(" %s:\n", data_block.c_str());
switch (tag) {
- case 0x00: parse_displayid_product_id(x + offset); break;
- case 0x01: parse_displayid_parameters(x + offset); break;
- case 0x02: parse_displayid_color_characteristics(x + offset); break;
+ case 0x00: parse_displayid_product_id(x); break;
+ case 0x01: parse_displayid_parameters(x); break;
+ case 0x02: parse_displayid_color_characteristics(x); break;
case 0x03:
- check_displayid_datablock_revision(x[offset + 1], 0, block_rev & 1);
+ check_displayid_datablock_revision(x[1], 0, block_rev & 1);
for (i = 0; i < len / 20; i++)
- parse_displayid_type_1_7_timing(&x[offset + 3 + (i * 20)], false, block_rev);
+ parse_displayid_type_1_7_timing(&x[3 + (i * 20)], false, block_rev);
break;
case 0x04:
- check_displayid_datablock_revision(x[offset + 1]);
+ check_displayid_datablock_revision(x[1]);
for (i = 0; i < len / 11; i++)
- parse_displayid_type_2_timing(&x[offset + 3 + (i * 11)]);
+ parse_displayid_type_2_timing(&x[3 + (i * 11)]);
break;
case 0x05:
- check_displayid_datablock_revision(x[offset + 1], 0, block_rev & 1);
+ check_displayid_datablock_revision(x[1], 0, block_rev & 1);
for (i = 0; i < len / 3; i++)
- parse_displayid_type_3_timing(&x[offset + 3 + (i * 3)]);
+ parse_displayid_type_3_timing(&x[3 + (i * 3)]);
break;
case 0x06:
- check_displayid_datablock_revision(x[offset + 1], 0xc0, 1);
+ check_displayid_datablock_revision(x[1], 0xc0, 1);
for (i = 0; i < len; i++)
- parse_displayid_type_4_8_timing((x[offset + 1] & 0xc0) >> 6, x[offset + 3 + i]);
+ parse_displayid_type_4_8_timing((x[1] & 0xc0) >> 6, x[3 + i]);
break;
case 0x07:
- check_displayid_datablock_revision(x[offset + 1]);
+ check_displayid_datablock_revision(x[1]);
for (i = 0; i < min(len, 10) * 8; i++)
- if (x[offset + 3 + i / 8] & (1 << (i % 8))) {
+ if (x[3 + i / 8] & (1 << (i % 8))) {
char type[16];
sprintf(type, "DMT 0x%02x", i + 1);
print_timings(" ", find_dmt_id(i + 1), type);
}
break;
case 0x08:
- check_displayid_datablock_revision(x[offset + 1]);
+ check_displayid_datablock_revision(x[1]);
for (i = 0; i < min(len, 8) * 8; i++)
- if (x[offset + 3 + i / 8] & (1 << (i % 8))) {
+ if (x[3 + i / 8] & (1 << (i % 8))) {
char type[16];
sprintf(type, "VIC %3u", i + 1);
print_timings(" ", find_vic_id(i + 1), type);
}
break;
- case 0x09: parse_displayid_video_timing_range_limits(x + offset); break;
+ case 0x09: parse_displayid_video_timing_range_limits(x); break;
case 0x0a:
- case 0x0b: parse_displayid_string(x + offset); break;
- case 0x0c: parse_displayid_display_device(x + offset); break;
- case 0x0d: parse_displayid_intf_power_sequencing(x + offset); break;
- case 0x0e: parse_displayid_transfer_characteristics(x + offset); break;
- case 0x0f: parse_displayid_display_intf(x + offset); break;
- case 0x10: parse_displayid_stereo_display_intf(x + offset); break;
+ case 0x0b: parse_displayid_string(x); break;
+ case 0x0c: parse_displayid_display_device(x); break;
+ case 0x0d: parse_displayid_intf_power_sequencing(x); break;
+ case 0x0e: parse_displayid_transfer_characteristics(x); break;
+ case 0x0f: parse_displayid_display_intf(x); break;
+ case 0x10: parse_displayid_stereo_display_intf(x); break;
case 0x11:
- check_displayid_datablock_revision(x[offset + 1]);
+ check_displayid_datablock_revision(x[1]);
for (i = 0; i < len / 7; i++)
- parse_displayid_type_5_timing(&x[offset + 3 + (i * 7)]);
+ parse_displayid_type_5_timing(&x[3 + (i * 7)]);
break;
- case 0x12: parse_displayid_tiled_display_topology(x + offset, false); break;
+ case 0x12: parse_displayid_tiled_display_topology(x, false); break;
case 0x13:
- check_displayid_datablock_revision(x[offset + 1]);
- for (i = 0; i < len; i += (x[offset + 3 + i + 2] & 0x40) ? 17 : 14)
- parse_displayid_type_6_timing(&x[offset + 3 + i]);
+ check_displayid_datablock_revision(x[1]);
+ for (i = 0; i < len; i += (x[3 + i + 2] & 0x40) ? 17 : 14)
+ parse_displayid_type_6_timing(&x[3 + i]);
break;
- case 0x20: parse_displayid_product_id(x + offset); break;
+ case 0x20: parse_displayid_product_id(x); break;
case 0x21:
if (block_rev >= 1)
- check_displayid_datablock_revision(x[offset + 1], 0x80, 1);
+ check_displayid_datablock_revision(x[1], 0x80, 1);
else
- check_displayid_datablock_revision(x[offset + 1], 0x80, 0);
- parse_displayid_parameters_v2(x + offset, block_rev);
+ check_displayid_datablock_revision(x[1], 0x80, 0);
+ parse_displayid_parameters_v2(x, block_rev);
break;
case 0x22: {
unsigned sz = 20;
if (block_rev >= 2)
- check_displayid_datablock_revision(x[offset + 1], 0x08, 2);
+ check_displayid_datablock_revision(x[1], 0x08, 2);
else if (block_rev == 1)
- check_displayid_datablock_revision(x[offset + 1], 0x08, 1);
+ check_displayid_datablock_revision(x[1], 0x08, 1);
else
- check_displayid_datablock_revision(x[offset + 1]);
- sz += (x[offset + 1] & 0x70) >> 4;
- if (block_rev >= 1 && (x[offset + 1] & 0x08))
+ check_displayid_datablock_revision(x[1]);
+ sz += (x[1] & 0x70) >> 4;
+ if (block_rev >= 1 && (x[1] & 0x08))
printf(" These timings support DSC pass-through\n");
for (i = 0; i < len / sz; i++)
- parse_displayid_type_1_7_timing(&x[offset + 3 + i * sz], true, block_rev);
+ parse_displayid_type_1_7_timing(&x[3 + i * sz], true, block_rev);
break;
}
case 0x23:
if (block_rev)
- check_displayid_datablock_revision(x[offset + 1], 0xe8, 1);
+ check_displayid_datablock_revision(x[1], 0xe8, 1);
else
- check_displayid_datablock_revision(x[offset + 1], 0xc8);
- if (x[offset + 1] & 0x08) {
+ check_displayid_datablock_revision(x[1], 0xc8);
+ if (x[1] & 0x08) {
for (i = 0; i < len / 2; i++)
- parse_displayid_type_4_8_timing((x[offset + 1] & 0xc0) >> 6,
- x[offset + 3 + i * 2] |
- (x[offset + 4 + i * 2] << 8));
+ parse_displayid_type_4_8_timing((x[1] & 0xc0) >> 6,
+ x[3 + i * 2] |
+ (x[4 + i * 2] << 8));
} else {
for (i = 0; i < len; i++)
- parse_displayid_type_4_8_timing((x[offset + 1] & 0xc0) >> 6,
- x[offset + 3 + i]);
+ parse_displayid_type_4_8_timing((x[1] & 0xc0) >> 6,
+ x[3 + i]);
}
break;
case 0x24:
- check_displayid_datablock_revision(x[offset + 1]);
+ check_displayid_datablock_revision(x[1]);
for (i = 0; i < len / 6; i++)
- parse_displayid_type_9_timing(&x[offset + 3 + i * 6]);
+ parse_displayid_type_9_timing(&x[3 + i * 6]);
break;
- case 0x25: parse_displayid_dynamic_video_timings_range_limits(x + offset); break;
- case 0x26: parse_displayid_interface_features(x + offset); break;
- case 0x27: parse_displayid_stereo_display_intf(x + offset); break;
- case 0x28: parse_displayid_tiled_display_topology(x + offset, true); break;
- case 0x29: parse_displayid_ContainerID(x + offset); break;
- case 0x2b: parse_displayid_adaptive_sync(x + offset); break;
+ case 0x25: parse_displayid_dynamic_video_timings_range_limits(x); break;
+ case 0x26: parse_displayid_interface_features(x); break;
+ case 0x27: parse_displayid_stereo_display_intf(x); break;
+ case 0x28: parse_displayid_tiled_display_topology(x, true); break;
+ case 0x29: parse_displayid_ContainerID(x); break;
+ case 0x2b: parse_displayid_adaptive_sync(x + offset); break;
case 0x32: {
- unsigned sz = 6 + ((x[offset + 1] & 0x70) >> 4);
+ unsigned sz = 6 + ((x[1] & 0x70) >> 4);
- check_displayid_datablock_revision(x[offset + 1], 0x70);
+ check_displayid_datablock_revision(x[1], 0x70);
for (i = 0; i < len / sz; i++)
- parse_displayid_type_10_timing(&x[offset + 3 + i * sz], sz);
+ parse_displayid_type_10_timing(&x[3 + i * sz], sz);
break;
}
- case 0x81: parse_displayid_cta_data_block(x + offset); break;
+ case 0x81: parse_displayid_cta_data_block(x); break;
case 0x7e:
if (oui == 0x3a0292) {
- parse_displayid_vesa(x + offset);
+ parse_displayid_vesa(x);
break;
}
// fall-through
- default: hex_block(" ", x + offset + 3, len); break;
+ default: hex_block(" ", x + 3, len); break;
}
if ((tag == 0x00 || tag == 0x20) &&
@@ -1934,7 +1934,7 @@ void edid_state::parse_displayid_block(const unsigned char *x)
unsigned offset = 5;
while (length > 0) {
- unsigned len = displayid_block(version, x, offset, length);
+ unsigned len = displayid_block(version, x + offset, length);
if (len == 0xff) break;
length -= len + 3;
offset += len + 3;

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