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Diffstat (limited to 'decoders/edid/edid.py')
| -rw-r--r-- | decoders/edid/edid.py | 469 |
1 files changed, 469 insertions, 0 deletions
diff --git a/decoders/edid/edid.py b/decoders/edid/edid.py new file mode 100644 index 0000000..b3ca128 --- /dev/null +++ b/decoders/edid/edid.py @@ -0,0 +1,469 @@ +## +## This file is part of the sigrok project. +## +## Copyright (C) 2012 Bert Vermeulen <bert@biot.com> +## +## This program is free software; you can redistribute it and/or modify +## it under the terms of the GNU General Public License as published by +## the Free Software Foundation; either version 3 of the License, or +## (at your option) any later version. +## +## This program is distributed in the hope that it will be useful, +## but WITHOUT ANY WARRANTY; without even the implied warranty of +## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +## GNU General Public License for more details. +## +## You should have received a copy of the GNU General Public License +## along with this program; if not, see <http://www.gnu.org/licenses/>. +## + +''' +EDID 1.3 structure decoder. + +Details: +https://en.wikipedia.org/wiki/Extended_display_identification_data +''' + +# TODO: +# - EDID < 1.3 +# - Signal level standard field in basic display parameters block +# - Additional color point descriptors +# - Additional standard timing descriptors +# - Extensions + +import sigrokdecode as srd +import os + +EDID_HEADER = [0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00] +OFF_VENDOR = 8 +OFF_VERSION = 18 +OFF_BASIC = 20 +OFF_CHROM = 25 +OFF_EST_TIMING = 35 +OFF_STD_TIMING = 38 +OFF_DET_TIMING = 54 +OFF_NUM_EXT = 126 +OFF_CHECKSUM = 127 + + +# Pre-EDID established timing modes +est_modes = [ + "720x400@70Hz", + "720x400@88Hz", + "640x480@60Hz", + "640x480@67Hz", + "640x480@72Hz", + "640x480@75Hz", + "800x600@56Hz", + "800x600@60Hz", + "800x600@72Hz", + "800x600@75Hz", + "832x624@75Hz", + "1024x768@87Hz(i)", + "1024x768@60Hz", + "1024x768@70Hz", + "1024x768@75Hz", + "1280x1024@75Hz", + "1152x870@75Hz" +] + +# X:Y display aspect ratios, as used in standard timing modes +xy_ratio = [ + (16, 10), + (4, 3), + (5, 4), + (16, 9) +] + +# Annotation types +ANN_FIELDS = 0 +ANN_SECTIONS = 1 + +class Decoder(srd.Decoder): + api_version = 1 + id = 'edid' + name = 'EDID' + longname = 'Extended display identification data' + desc = 'A data structure describing the capabilities of a display device.' + license = 'gplv3+' + inputs = ['ddc2'] + outputs = ['edid'] + options = {} + annotations = [ + ['EDID fields', 'EDID structure fields'], + ['EDID sections', 'EDID structure sections'], + ] + + def __init__(self, **kwargs): + self.state = None + # Received data items, used as an index into samplenum/data + self.cnt = 0 + # Start/end sample numbers per data item + self.sn = [] + # Received data + self.cache = [] + + def start(self, metadata): + self.out_ann = self.add(srd.OUTPUT_ANN, 'edid') + + def decode(self, ss, es, data): + if type(data) != int: + raise Exception('malformed ddc2 input: expected 1 byte') + self.cnt += 1 + self.sn.append( [ss, es] ) + self.cache.append(data) + + if self.state is None: + # Wait for the EDID header + if self.cnt >= OFF_VENDOR: + if self.cache[-8:] == EDID_HEADER: + # Throw away any garbage before the header + self.sn = self.sn[-8:] + self.cache = self.cache[-8:] + self.state = 'edid' + self.put(ss, es, self.out_ann, [0, ["EDID header"]]) + elif self.state == 'edid': + if self.cnt == OFF_VERSION: + self.decode_vid(-10) + self.decode_pid(-8) + self.decode_serial(-6) + self.decode_mfrdate(-2) + elif self.cnt == OFF_BASIC: + version = "EDID version: %d.%d" % (self.cache[-2], self.cache[-1]) + self.put(ss, es, self.out_ann, [0, [version]]) + elif self.cnt == OFF_CHROM: + self.decode_basicdisplay(-5) + elif self.cnt == OFF_EST_TIMING: + self.decode_chromaticity(-10) + elif self.cnt == OFF_STD_TIMING: + self.decode_est_timing(-3) + elif self.cnt == OFF_DET_TIMING: + self.decode_std_timing(-16) + elif self.cnt == OFF_NUM_EXT: + self.decode_descriptors(-72) + elif self.cnt == OFF_CHECKSUM: + self.put(ss, es, self.out_ann, [0, ["Extensions present: %d" % self.cache[self.cnt-1]]]) + elif self.cnt == OFF_CHECKSUM+1: + checksum = 0 + for i in range(128): + checksum += self.cache[i] + if checksum % 256 == 0: + csstr = "OK" + else: + csstr = "WRONG!" + self.put(ss, es, self.out_ann, [0, ["Checksum: %d (%s)" % ( + self.cache[self.cnt-1], csstr)]]) + self.state = 'extensions' + elif self.state == 'extensions': + pass + + def ann_field(self, start, end, annotation): + self.put(self.sn[start][0], self.sn[end][1], self.out_ann, [ANN_FIELDS, [annotation]]) + + def lookup_pnpid(self, pnpid): + pnpid_file = os.path.dirname(__file__) + '/pnpids.txt' + if os.path.exists(pnpid_file): + for line in open(pnpid_file).readlines(): + if line.find(pnpid + ';') == 0: + return line[4:].strip() + return '' + + def decode_vid(self, offset): + pnpid = chr(64 + ((self.cache[offset] & 0x7c) >> 2)) + pnpid += chr(64 + (((self.cache[offset] & 0x03) << 3) + | ((self.cache[offset+1] & 0xe0) >> 5))) + pnpid += chr(64 + (self.cache[offset+1] & 0x1f)) + vendor = self.lookup_pnpid(pnpid) + if vendor: + pnpid += " (%s)" % vendor + self.ann_field(offset, offset+1, pnpid) + + def decode_pid(self, offset): + pidstr = "Product 0x%.2x%.2x" % (self.cache[offset+1], self.cache[offset]) + self.ann_field(offset, offset+1, pidstr) + + def decode_serial(self, offset): + serialnum = (self.cache[offset+3] << 24) \ + + (self.cache[offset+2] << 16) \ + + (self.cache[offset+1] << 8) \ + + self.cache[offset] + serialstr = '' + is_alnum = True + for i in range(4): + if not chr(self.cache[offset+3-i]).isalnum(): + is_alnum = False + break + serialstr += chr(self.cache[offset+3-i]) + if is_alnum: + serial = serialstr + else: + serial = str(serialnum) + self.ann_field(offset, offset+3, "Serial " + serial) + + def decode_mfrdate(self, offset): + datestr = '' + if self.cache[offset]: + datestr += "week %d, " % self.cache[offset] + datestr += str(1990 + self.cache[offset+1]) + if datestr: + self.ann_field(offset, offset+1, "Manufactured " + datestr) + + def decode_basicdisplay(self, offset): + # Video input definition + vid = self.cache[offset] + if vid & 0x80: + # Digital + self.ann_field(offset, offset, "Video input: VESA DFP 1.") + else: + # Analog + sls = (vid & 60) >> 5 + self.ann_field(offset, offset, "Signal level standard: %.2x" % sls) + if vid & 0x10: + self.ann_field(offset, offset, "Blank-to-black setup expected") + syncs = '' + if vid & 0x08: + syncs += 'separate syncs, ' + if vid & 0x04: + syncs += 'composite syncs, ' + if vid & 0x02: + syncs += 'sync on green, ' + if vid & 0x01: + syncs += 'Vsync serration required, ' + if syncs: + self.ann_field(offset, offset, "Supported syncs: %s" % syncs[:-2]) + # Max horizontal/vertical image size + if self.cache[offset+1] != 0 and self.cache[offset+2] != 0: + # Projectors have this set to 0 + sizestr = "%dx%dcm" % (self.cache[offset+1], self.cache[offset+2]) + self.ann_field(offset+1, offset+2, "Physical size: " + sizestr) + # Display transfer characteristic (gamma) + if self.cache[offset+3] != 0xff: + gamma = (self.cache[offset+3] + 100) / 100 + self.ann_field(offset+3, offset+3, "Gamma: %1.2f" % gamma) + # Feature support + fs = self.cache[offset+4] + dpms = '' + if fs & 0x80: + dpms += 'standby, ' + if fs & 0x40: + dpms += 'suspend, ' + if fs & 0x20: + dpms += 'active off, ' + if dpms: + self.ann_field(offset+4, offset+4, "DPMS support: %s" % dpms[:-2]) + dt = (fs & 0x18) >> 3 + dtstr = '' + if dt == 0: + dtstr = 'Monochrome' + elif dt == 1: + dtstr = 'RGB color' + elif dt == 2: + dtstr = 'non-RGB multicolor' + if dtstr: + self.ann_field(offset+4, offset+4, "Display type: %s" % dtstr) + if fs & 0x04: + self.ann_field(offset+4, offset+4, "Color space: standard sRGB") + # Save this for when we decode the first detailed timing descriptor + self.have_preferred_timing = (fs & 0x02) == 0x02 + if fs & 0x01: + gft = '' + else: + gft = 'not ' + self.ann_field(offset+4, offset+4, "Generalized timing formula: %ssupported" % gft) + + def convert_color(self, value): + # Convert from 10-bit packet format to float + outval = 0.0 + for i in range(10): + if value & 0x01: + outval += 2 ** -(10-i) + value >>= 1 + return outval + + def decode_chromaticity(self, offset): + redx = (self.cache[offset+2] << 2) + ((self.cache[offset] & 0xc0) >> 6) + redy = (self.cache[offset+3] << 2) + ((self.cache[offset] & 0x30) >> 4) + self.ann_field(offset, offset+9, "Chromacity red: X %1.3f, Y %1.3f" % ( + self.convert_color(redx), self.convert_color(redy))) + + greenx = (self.cache[offset+4] << 2) + ((self.cache[offset] & 0x0c) >> 6) + greeny = (self.cache[offset+5] << 2) + ((self.cache[offset] & 0x03) >> 4) + self.ann_field(offset, offset+9, "Chromacity green: X %1.3f, Y %1.3f" % ( + self.convert_color(greenx), self.convert_color(greeny))) + + bluex = (self.cache[offset+6] << 2) + ((self.cache[offset+1] & 0xc0) >> 6) + bluey = (self.cache[offset+7] << 2) + ((self.cache[offset+1] & 0x30) >> 4) + self.ann_field(offset, offset+9, "Chromacity blue: X %1.3f, Y %1.3f" % ( + self.convert_color(bluex), self.convert_color(bluey))) + + whitex = (self.cache[offset+8] << 2) + ((self.cache[offset+1] & 0x0c) >> 6) + whitey = (self.cache[offset+9] << 2) + ((self.cache[offset+1] & 0x03) >> 4) + self.ann_field(offset, offset+9, "Chromacity white: X %1.3f, Y %1.3f" % ( + self.convert_color(whitex), self.convert_color(whitey))) + + def decode_est_timing(self, offset): + # Pre-EDID modes + bitmap = (self.cache[offset] << 9) \ + + (self.cache[offset+1] << 1) \ + + ((self.cache[offset+2] & 0x80) >> 7) + modestr = '' + for i in range(17): + if bitmap & (1 << (16-i)): + modestr += est_modes[i] + ', ' + if modestr: + self.ann_field(offset, offset+2, "Supported establised modes: %s" % modestr[:-2]) + + def decode_std_timing(self, offset): + modestr = '' + for i in range(0, 16, 2): + if self.cache[offset+i] == 0x01 and self.cache[offset+i+1] == 0x01: + # Unused field + continue + x = (self.cache[offset+i] + 31) * 8 + ratio = (self.cache[offset+i+1] & 0xc0) >> 6 + ratio_x, ratio_y = xy_ratio[ratio] + y = x / ratio_x * ratio_y + refresh = (self.cache[offset+i+1] & 0x3f) + 60 + modestr += "%dx%d@%dHz, " % (x, y, refresh) + if modestr: + self.ann_field(offset, offset+2, "Supported standard modes: %s" % modestr[:-2]) + + def decode_detailed_timing(self, offset): + if offset == -72 and self.have_preferred_timing: + # Only on first detailed timing descriptor + section = 'Preferred' + else: + section = 'Detailed' + section += ' timing descriptor' + self.put(self.sn[offset][0], self.sn[offset+18][1], + self.out_ann, [ANN_SECTIONS, [section]]) + + pixclock = float((self.cache[offset+1] << 8) + self.cache[offset]) / 100 + self.ann_field(offset, offset+1, "Pixel clock: %.2f MHz" % pixclock) + + horiz_active = ((self.cache[offset+4] & 0xf0) << 4) + self.cache[offset+2] + self.ann_field(offset+2, offset+4, "Horizontal active: %d" % horiz_active) + + horiz_blank = ((self.cache[offset+4] & 0x0f) << 8) + self.cache[offset+3] + self.ann_field(offset+3, offset+4, "Horizontal blanking: %d" % horiz_blank) + + vert_active = ((self.cache[offset+7] & 0xf0) << 4) + self.cache[offset+5] + self.ann_field(offset+5, offset+7, "Vertical active: %d" % vert_active) + + vert_blank = ((self.cache[offset+7] & 0x0f) << 8) + self.cache[offset+6] + self.ann_field(offset+6, offset+7, "Vertical blanking: %d" % vert_blank) + + horiz_sync_off = ((self.cache[offset+11] & 0xc0) << 2) + self.cache[offset+8] + self.ann_field(offset+8, offset+11, "Horizontal sync offset: %d" % horiz_sync_off) + + horiz_sync_pw = ((self.cache[offset+11] & 0x30) << 4) + self.cache[offset+9] + self.ann_field(offset+9, offset+11, "Horizontal sync pulse width: %d" % horiz_sync_pw) + + vert_sync_off = ((self.cache[offset+11] & 0x0c) << 2) \ + + ((self.cache[offset+10] & 0xf0) >> 4) + self.ann_field(offset+10, offset+11, "Vertical sync offset: %d" % vert_sync_off) + + vert_sync_pw = ((self.cache[offset+11] & 0x03) << 4) \ + + (self.cache[offset+10] & 0x0f) + self.ann_field(offset+10, offset+11, "Vertical sync pulse width: %d" % vert_sync_pw) + + horiz_size = ((self.cache[offset+14] & 0xf0) << 4) + self.cache[offset+12] + vert_size = ((self.cache[offset+14] & 0x0f) << 8) + self.cache[offset+13] + self.ann_field(offset+12, offset+14, "Physical size: %dx%dmm" % (horiz_size, vert_size)) + + horiz_border = self.cache[offset+15] + if horiz_border: + self.ann_field(offset+15, offset+15, "Horizontal border: %d pixels" % horiz_border) + vert_border = self.cache[offset+16] + if vert_border: + self.ann_field(offset+16, offset+16, "Vertical border: %d lines" % vert_border) + + features = 'Flags: ' + if self.cache[offset+17] & 0x80: + features += 'interlaced, ' + stereo = (self.cache[offset+17] & 0x60) >> 5 + if stereo: + if self.cache[offset+17] & 0x01: + features += '2-way interleaved stereo (' + features += ['right image on even lines', 'left image on even lines', + 'side-by-side'][stereo-1] + features += '), ' + else: + features += 'field sequential stereo (' + features += ['right image on sync=1', 'left image on sync=1', + '4-way interleaved'][stereo-1] + features += '), ' + sync = (self.cache[offset+17] & 0x18) >> 3 + sync2 = (self.cache[offset+17] & 0x06) >> 1 + posneg = ['negative', 'positive'] + features += 'sync type ' + if sync == 0x00: + features += 'analog composite (serrate on RGB)' + elif sync == 0x01: + features += 'bipolar analog composite (serrate on RGB)' + elif sync == 0x02: + features += 'digital composite (serrate on composite polarity ' \ + + (posneg[sync2 & 0x01]) + ')' + elif sync == 0x03: + features += 'digital separate (' + features += 'Vsync polarity ' + (posneg[sync2 >> 1]) + features += ', Hsync polarity ' + (posneg[sync2 & 0x01]) + features += ')' + features += ', ' + self.ann_field(offset+17, offset+17, features[:-2]) + + def decode_descriptor(self, offset): + tag = self.cache[offset+3] + if tag == 0xff: + # Monitor serial number + text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace') + self.ann_field(offset, offset+17, "Serial number: %s" % text.strip()) + elif tag == 0xfe: + # Text + text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace') + self.ann_field(offset, offset+17, "Info: %s" % text.strip()) + elif tag == 0xfc: + # Monitor name + text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace') + self.ann_field(offset, offset+17, "Model name: %s" % text.strip()) + elif tag == 0xfd: + # Monitor range limits + self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann, + [ANN_SECTIONS, ["Monitor range limits"]]) + self.ann_field(offset+5, offset+5, "Minimum vertical rate: %dHz" % + self.cache[offset+5]) + self.ann_field(offset+6, offset+6, "Maximum vertical rate: %dHz" % + self.cache[offset+6]) + self.ann_field(offset+7, offset+7, "Minimum horizontal rate: %dkHz" % + self.cache[offset+7]) + self.ann_field(offset+8, offset+8, "Maximum horizontal rate: %dkHz" % + self.cache[offset+8]) + self.ann_field(offset+9, offset+9, "Maximum pixel clock: %dMHz" % + (self.cache[offset+9] * 10)) + if self.cache[offset+10] == 0x02: + # Secondary GTF curve supported + self.ann_field(offset+10, offset+17, "Secondary timing formula supported") + elif tag == 0xfb: + # Additional color point data + self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann, + [ANN_SECTIONS, ["Additional color point data"]]) + elif tag == 0xfa: + # Additional standard timing definitions + self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann, + [ANN_SECTIONS, ["Additional standard timing definitions"]]) + else: + self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann, + [ANN_SECTIONS, ["Unknown descriptor"]]) + + def decode_descriptors(self, offset): + # 4 consecutive 18-byte descriptor blocks + for i in range(offset, 0, 18): + if self.cache[i] != 0 and self.cache[i+1] != 0: + self.decode_detailed_timing(i) + else: + if self.cache[i+2] == 0 or self.cache[i+4] == 0 or True: + self.decode_descriptor(i) + + + + |