From d00aab12b6ace2c3dda3efbc2aaa2646d78a9099 Mon Sep 17 00:00:00 2001 From: Perberos Date: Thu, 1 Dec 2011 22:07:25 -0300 Subject: moving from https://github.com/perberos/mate-desktop-environment --- libmate-desktop/edid-parse.c | 536 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 536 insertions(+) create mode 100644 libmate-desktop/edid-parse.c (limited to 'libmate-desktop/edid-parse.c') diff --git a/libmate-desktop/edid-parse.c b/libmate-desktop/edid-parse.c new file mode 100644 index 0000000..842e327 --- /dev/null +++ b/libmate-desktop/edid-parse.c @@ -0,0 +1,536 @@ +/* + * Copyright 2007 Red Hat, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * on the rights to use, copy, modify, merge, publish, distribute, sub + * license, and/or sell copies of the Software, and to permit persons to whom + * the Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER + * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +/* Author: Soren Sandmann */ + +#include "edid.h" +#include +#include +#include +#include + +static int get_bit(int in, int bit) +{ + return (in & (1 << bit)) >> bit; +} + +static int get_bits(int in, int begin, int end) +{ + int mask = (1 << (end - begin + 1)) - 1; + + return (in >> begin) & mask; +} + +static int decode_header(const uchar* edid) +{ + if (memcmp(edid, "\x00\xff\xff\xff\xff\xff\xff\x00", 8) == 0) + { + return TRUE; + } + + return FALSE; +} + +static int decode_vendor_and_product_identification(const uchar* edid, MonitorInfo* info) +{ + int is_model_year; + + /* Manufacturer Code */ + info->manufacturer_code[0] = get_bits(edid[0x08], 2, 6); + info->manufacturer_code[1] = get_bits(edid[0x08], 0, 1) << 3; + info->manufacturer_code[1] |= get_bits(edid[0x09], 5, 7); + info->manufacturer_code[2] = get_bits(edid[0x09], 0, 4); + info->manufacturer_code[3] = '\0'; + + info->manufacturer_code[0] += 'A' - 1; + info->manufacturer_code[1] += 'A' - 1; + info->manufacturer_code[2] += 'A' - 1; + + /* Product Code */ + info->product_code = edid[0x0b] << 8 | edid[0x0a]; + + /* Serial Number */ + info->serial_number = edid[0x0c] | edid[0x0d] << 8 | edid[0x0e] << 16 | edid[0x0f] << 24; + + /* Week and Year */ + is_model_year = FALSE; + + switch (edid[0x10]) + { + case 0x00: + info->production_week = -1; + break; + + case 0xff: + info->production_week = -1; + is_model_year = TRUE; + break; + + default: + info->production_week = edid[0x10]; + break; + } + + if (is_model_year) + { + info->production_year = -1; + info->model_year = 1990 + edid[0x11]; + } + else + { + info->production_year = 1990 + edid[0x11]; + info->model_year = -1; + } + + return TRUE; +} + +static int decode_edid_version(const uchar* edid, MonitorInfo* info) +{ + info->major_version = edid[0x12]; + info->minor_version = edid[0x13]; + + return TRUE; +} + +static int decode_display_parameters(const uchar* edid, MonitorInfo* info) +{ + /* Digital vs Analog */ + info->is_digital = get_bit(edid[0x14], 7); + + if (info->is_digital) + { + int bits; + + static const int bit_depth[8] = { + -1, 6, 8, 10, 12, 14, 16, -1 + }; + + static const Interface interfaces[6] = { + UNDEFINED, DVI, HDMI_A, HDMI_B, MDDI, DISPLAY_PORT + }; + + bits = get_bits(edid[0x14], 4, 6); + info->connector.digital.bits_per_primary = bit_depth[bits]; + + bits = get_bits(edid[0x14], 0, 3); + + if (bits <= 5) + { + info->connector.digital.interface = interfaces[bits]; + } + else + { + info->connector.digital.interface = UNDEFINED; + } + } + else + { + int bits = get_bits (edid[0x14], 5, 6); + + static const double levels[][3] = { + { 0.7, 0.3, 1.0 }, + { 0.714, 0.286, 1.0 }, + { 1.0, 0.4, 1.4 }, + { 0.7, 0.0, 0.7 }, + }; + + info->connector.analog.video_signal_level = levels[bits][0]; + info->connector.analog.sync_signal_level = levels[bits][1]; + info->connector.analog.total_signal_level = levels[bits][2]; + + info->connector.analog.blank_to_black = get_bit (edid[0x14], 4); + + info->connector.analog.separate_hv_sync = get_bit (edid[0x14], 3); + info->connector.analog.composite_sync_on_h = get_bit (edid[0x14], 2); + info->connector.analog.composite_sync_on_green = get_bit (edid[0x14], 1); + + info->connector.analog.serration_on_vsync = get_bit (edid[0x14], 0); + } + + /* Screen Size / Aspect Ratio */ + if (edid[0x15] == 0 && edid[0x16] == 0) + { + info->width_mm = -1; + info->height_mm = -1; + info->aspect_ratio = -1.0; + } + else if (edid[0x16] == 0) + { + info->width_mm = -1; + info->height_mm = -1; + info->aspect_ratio = 100.0 / (edid[0x15] + 99); + } + else if (edid[0x15] == 0) + { + info->width_mm = -1; + info->height_mm = -1; + info->aspect_ratio = 100.0 / (edid[0x16] + 99); + info->aspect_ratio = 1/info->aspect_ratio; /* portrait */ + } + else + { + info->width_mm = 10 * edid[0x15]; + info->height_mm = 10 * edid[0x16]; + } + + /* Gamma */ + if (edid[0x17] == 0xFF) + info->gamma = -1.0; + else + info->gamma = (edid[0x17] + 100.0) / 100.0; + + /* Features */ + info->standby = get_bit(edid[0x18], 7); + info->suspend = get_bit(edid[0x18], 6); + info->active_off = get_bit(edid[0x18], 5); + + if (info->is_digital) + { + info->connector.digital.rgb444 = TRUE; + + if (get_bit(edid[0x18], 3)) + info->connector.digital.ycrcb444 = 1; + if (get_bit(edid[0x18], 4)) + info->connector.digital.ycrcb422 = 1; + } + else + { + int bits = get_bits(edid[0x18], 3, 4); + + ColorType color_type[4] = { + MONOCHROME, RGB, OTHER_COLOR, UNDEFINED_COLOR + }; + + info->connector.analog.color_type = color_type[bits]; + } + + info->srgb_is_standard = get_bit(edid[0x18], 2); + + /* In 1.3 this is called "has preferred timing" */ + info->preferred_timing_includes_native = get_bit(edid[0x18], 1); + + /* FIXME: In 1.3 this indicates whether the monitor accepts GTF */ + info->continuous_frequency = get_bit(edid[0x18], 0); + + return TRUE; +} + +static double decode_fraction(int high, int low) +{ + double result = 0.0; + int i; + + high = (high << 2) | low; + + for (i = 0; i < 10; ++i) + { + result += get_bit (high, i) * pow (2, i - 10); + } + + return result; +} + +static int decode_color_characteristics(const uchar* edid, MonitorInfo* info) +{ + info->red_x = decode_fraction(edid[0x1b], get_bits(edid[0x19], 6, 7)); + info->red_y = decode_fraction(edid[0x1c], get_bits(edid[0x19], 5, 4)); + info->green_x = decode_fraction(edid[0x1d], get_bits(edid[0x19], 2, 3)); + info->green_y = decode_fraction(edid[0x1e], get_bits(edid[0x19], 0, 1)); + info->blue_x = decode_fraction(edid[0x1f], get_bits(edid[0x1a], 6, 7)); + info->blue_y = decode_fraction(edid[0x20], get_bits(edid[0x1a], 4, 5)); + info->white_x = decode_fraction(edid[0x21], get_bits(edid[0x1a], 2, 3)); + info->white_y = decode_fraction(edid[0x22], get_bits(edid[0x1a], 0, 1)); + + return TRUE; +} + +static int decode_established_timings(const uchar* edid, MonitorInfo* info) +{ + static const Timing established[][8] = { + { + {800, 600, 60}, + {800, 600, 56}, + {640, 480, 75}, + {640, 480, 72}, + {640, 480, 67}, + {640, 480, 60}, + {720, 400, 88}, + {720, 400, 70} + }, + { + {1280, 1024, 75}, + {1024, 768, 75}, + {1024, 768, 70}, + {1024, 768, 60}, + {1024, 768, 87}, + {832, 624, 75}, + {800, 600, 75}, + {800, 600, 72} + }, + { + {0, 0, 0}, + {0, 0, 0}, + {0, 0, 0}, + {0, 0, 0}, + {0, 0, 0}, + {0, 0, 0}, + {0, 0, 0}, + {1152, 870, 75} + }, + }; + + int i, j, idx; + + idx = 0; + + for (i = 0; i < 3; ++i) + { + for (j = 0; j < 8; ++j) + { + int byte = edid[0x23 + i]; + + if (get_bit (byte, j) && established[i][j].frequency != 0) + { + info->established[idx++] = established[i][j]; + } + } + } + + return TRUE; +} + +static int decode_standard_timings(const uchar* edid, MonitorInfo* info) +{ + int i; + + for (i = 0; i < 8; i++) + { + int first = edid[0x26 + 2 * i]; + int second = edid[0x27 + 2 * i]; + + if (first != 0x01 && second != 0x01) + { + int w = 8 * (first + 31); + int h; + + switch (get_bits(second, 6, 7)) + { + case 0x00: + h = (w / 16) * 10; + break; + case 0x01: + h = (w / 4) * 3; + break; + case 0x02: + h = (w / 5) * 4; + break; + case 0x03: + h = (w / 16) * 9; + break; + } + + info->standard[i].width = w; + info->standard[i].height = h; + info->standard[i].frequency = get_bits(second, 0, 5) + 60; + } + } + + return TRUE; +} + +static void decode_lf_string(const uchar* s, int n_chars, char* result) +{ + int i; + + for (i = 0; i < n_chars; ++i) + { + if (s[i] == 0x0a) + { + *result++ = '\0'; + break; + } + else if (s[i] == 0x00) + { + /* Convert embedded 0's to spaces */ + *result++ = ' '; + } + else + { + *result++ = s[i]; + } + } +} + +static void decode_display_descriptor(const uchar* desc, MonitorInfo* info) +{ + switch (desc[0x03]) + { + case 0xFC: + decode_lf_string (desc + 5, 13, info->dsc_product_name); + break; + case 0xFF: + decode_lf_string (desc + 5, 13, info->dsc_serial_number); + break; + case 0xFE: + decode_lf_string (desc + 5, 13, info->dsc_string); + break; + case 0xFD: + /* Range Limits */ + break; + case 0xFB: + /* Color Point */ + break; + case 0xFA: + /* Timing Identifications */ + break; + case 0xF9: + /* Color Management */ + break; + case 0xF8: + /* Timing Codes */ + break; + case 0xF7: + /* Established Timings */ + break; + case 0x10: + break; + } +} + +static void decode_detailed_timing(const uchar* timing, DetailedTiming* detailed) +{ + int bits; + + StereoType stereo[] = { + NO_STEREO, NO_STEREO, FIELD_RIGHT, FIELD_LEFT, + TWO_WAY_RIGHT_ON_EVEN, TWO_WAY_LEFT_ON_EVEN, + FOUR_WAY_INTERLEAVED, SIDE_BY_SIDE + }; + + detailed->pixel_clock = (timing[0x00] | timing[0x01] << 8) * 10000; + detailed->h_addr = timing[0x02] | ((timing[0x04] & 0xf0) << 4); + detailed->h_blank = timing[0x03] | ((timing[0x04] & 0x0f) << 8); + detailed->v_addr = timing[0x05] | ((timing[0x07] & 0xf0) << 4); + detailed->v_blank = timing[0x06] | ((timing[0x07] & 0x0f) << 8); + detailed->h_front_porch = timing[0x08] | get_bits(timing[0x0b], 6, 7) << 8; + detailed->h_sync = timing[0x09] | get_bits(timing[0x0b], 4, 5) << 8; + detailed->v_front_porch = + get_bits (timing[0x0a], 4, 7) | get_bits(timing[0x0b], 2, 3) << 4; + detailed->v_sync = + get_bits (timing[0x0a], 0, 3) | get_bits(timing[0x0b], 0, 1) << 4; + detailed->width_mm = timing[0x0c] | get_bits(timing[0x0e], 4, 7) << 8; + detailed->height_mm = timing[0x0d] | get_bits(timing[0x0e], 0, 3) << 8; + detailed->right_border = timing[0x0f]; + detailed->top_border = timing[0x10]; + + detailed->interlaced = get_bit(timing[0x11], 7); + + /* Stereo */ + bits = get_bits (timing[0x11], 5, 6) << 1 | get_bit(timing[0x11], 0); + detailed->stereo = stereo[bits]; + + /* Sync */ + bits = timing[0x11]; + + detailed->digital_sync = get_bit(bits, 4); + + if (detailed->digital_sync) + { + detailed->connector.digital.composite = !get_bit(bits, 3); + + if (detailed->connector.digital.composite) + { + detailed->connector.digital.serrations = get_bit(bits, 2); + detailed->connector.digital.negative_vsync = FALSE; + } + else + { + detailed->connector.digital.serrations = FALSE; + detailed->connector.digital.negative_vsync = !get_bit(bits, 2); + } + + detailed->connector.digital.negative_hsync = !get_bit(bits, 0); + } + else + { + detailed->connector.analog.bipolar = get_bit(bits, 3); + detailed->connector.analog.serrations = get_bit(bits, 2); + detailed->connector.analog.sync_on_green = !get_bit(bits, 1); + } +} + +static int decode_descriptors(const uchar* edid, MonitorInfo* info) +{ + int i; + int timing_idx; + + timing_idx = 0; + + for (i = 0; i < 4; ++i) + { + int index = 0x36 + i * 18; + + if (edid[index + 0] == 0x00 && edid[index + 1] == 0x00) + { + decode_display_descriptor(edid + index, info); + } + else + { + decode_detailed_timing(edid + index, &(info->detailed_timings[timing_idx++])); + } + } + + info->n_detailed_timings = timing_idx; + + return TRUE; +} + +static void decode_check_sum(const uchar* edid, MonitorInfo* info) +{ + int i; + uchar check = 0; + + for (i = 0; i < 128; ++i) + { + check += edid[i]; + } + + info->checksum = check; +} + +MonitorInfo* decode_edid(const uchar* edid) +{ + MonitorInfo* info = g_new0(MonitorInfo, 1); + + decode_check_sum(edid, info); + + if (decode_header(edid) && decode_vendor_and_product_identification(edid, info) && decode_edid_version(edid, info) && decode_display_parameters(edid, info) && decode_color_characteristics(edid, info) && decode_established_timings(edid, info) && decode_standard_timings(edid, info) && decode_descriptors(edid, info)) + { + return info; + } + else + { + g_free(info); + return NULL; + } +} -- cgit v1.2.1