void InbandTextTrackPrivateAVF::processCueAttributes(CFAttributedStringRef attributedString, StringBuilder& content, StringBuilder& settings)
{
// Some of the attributes we translate into per-cue WebVTT settings are are repeated on each part of an attributed string so only
// process the first instance of each.
enum AttributeFlags {
Line = 1 << 0,
Position = 1 << 1,
Size = 1 << 2,
Vertical = 1 << 3,
Align = 1 << 4
};
unsigned processed = 0;
String attributedStringValue = CFAttributedStringGetString(attributedString);
CFIndex length = attributedStringValue.length();
if (!length)
return;
CFRange effectiveRange = CFRangeMake(0, 0);
while ((effectiveRange.location + effectiveRange.length) < length) {
CFDictionaryRef attributes = CFAttributedStringGetAttributes(attributedString, effectiveRange.location + effectiveRange.length, &effectiveRange);
if (!attributes)
continue;
StringBuilder tagStart;
String tagEnd;
CFIndex attributeCount = CFDictionaryGetCount(attributes);
Vector<const void*> keys(attributeCount);
Vector<const void*> values(attributeCount);
CFDictionaryGetKeysAndValues(attributes, keys.data(), values.data());
for (CFIndex i = 0; i < attributeCount; ++i) {
CFStringRef key = static_cast<CFStringRef>(keys[i]);
CFTypeRef value = values[i];
if (CFGetTypeID(key) != CFStringGetTypeID() || !CFStringGetLength(key))
continue;
if (CFStringCompare(key, kCMTextMarkupAttribute_Alignment, 0) == kCFCompareEqualTo) {
CFStringRef valueString = static_cast<CFStringRef>(value);
if (CFGetTypeID(valueString) != CFStringGetTypeID() || !CFStringGetLength(valueString))
continue;
if (processed & Align)
continue;
processed |= Align;
if (CFStringCompare(valueString, kCMTextMarkupAlignmentType_Start, 0) == kCFCompareEqualTo)
settings.append("align:start ");
else if (CFStringCompare(valueString, kCMTextMarkupAlignmentType_Middle, 0) == kCFCompareEqualTo)
settings.append("align:middle ");
else if (CFStringCompare(valueString, kCMTextMarkupAlignmentType_End, 0) == kCFCompareEqualTo)
settings.append("align:end ");
else
ASSERT_NOT_REACHED();
continue;
}
if (CFStringCompare(key, kCMTextMarkupAttribute_BoldStyle, 0) == kCFCompareEqualTo) {
if (static_cast<CFBooleanRef>(value) != kCFBooleanTrue)
continue;
tagStart.append("<b>");
tagEnd.insert("</b>", 0);
continue;
}
if (CFStringCompare(key, kCMTextMarkupAttribute_ItalicStyle, 0) == kCFCompareEqualTo) {
if (static_cast<CFBooleanRef>(value) != kCFBooleanTrue)
continue;
tagStart.append("<i>");
tagEnd.insert("</i>", 0);
continue;
}
if (CFStringCompare(key, kCMTextMarkupAttribute_UnderlineStyle, 0) == kCFCompareEqualTo) {
if (static_cast<CFBooleanRef>(value) != kCFBooleanTrue)
continue;
tagStart.append("<u>");
tagEnd.insert("</u>", 0);
continue;
}
if (CFStringCompare(key, kCMTextMarkupAttribute_OrthogonalLinePositionPercentageRelativeToWritingDirection, 0) == kCFCompareEqualTo) {
// Ignore the line position if the attributes also specify "size" so we keep WebVTT's default line logic
if (CFDictionaryGetValue(attributes, kCMTextMarkupAttribute_WritingDirectionSizePercentage))
continue;
if (CFGetTypeID(value) != CFNumberGetTypeID())
continue;
if (processed & Line)
continue;
processed |= Line;
CFNumberRef valueNumber = static_cast<CFNumberRef>(value);
double position;
CFNumberGetValue(valueNumber, kCFNumberFloat64Type, &position);
settings.append(String::format("line:%ld%% ", lrint(position)));
continue;
}
if (CFStringCompare(key, kCMTextMarkupAttribute_TextPositionPercentageRelativeToWritingDirection, 0) == kCFCompareEqualTo) {
if (CFGetTypeID(value) != CFNumberGetTypeID())
continue;
if (processed & Position)
continue;
processed |= Position;
CFNumberRef valueNumber = static_cast<CFNumberRef>(value);
double position;
CFNumberGetValue(valueNumber, kCFNumberFloat64Type, &position);
settings.append(String::format("position:%ld%% ", lrint(position)));
continue;
}
if (CFStringCompare(key, kCMTextMarkupAttribute_WritingDirectionSizePercentage, 0) == kCFCompareEqualTo) {
if (CFGetTypeID(value) != CFNumberGetTypeID())
continue;
if (processed & Size)
continue;
processed |= Size;
CFNumberRef valueNumber = static_cast<CFNumberRef>(value);
double position;
CFNumberGetValue(valueNumber, kCFNumberFloat64Type, &position);
settings.append(String::format("size:%ld%% ", lrint(position)));
continue;
}
}
content.append(tagStart);
content.append(attributedStringValue.substring(effectiveRange.location, effectiveRange.length));
content.append(tagEnd);
}
}
void InbandTextTrackPrivateAVF::processCueAttributes(CFAttributedStringRef attributedString, GenericCueData* cueData)
{
// Some of the attributes we translate into per-cue WebVTT settings are are repeated on each part of an attributed string so only
// process the first instance of each.
enum AttributeFlags {
Line = 1 << 0,
Position = 1 << 1,
Size = 1 << 2,
Vertical = 1 << 3,
Align = 1 << 4,
FontName = 1 << 5
};
unsigned processed = 0;
StringBuilder content;
String attributedStringValue = CFAttributedStringGetString(attributedString);
CFIndex length = attributedStringValue.length();
if (!length)
return;
CFRange effectiveRange = CFRangeMake(0, 0);
while ((effectiveRange.location + effectiveRange.length) < length) {
CFDictionaryRef attributes = CFAttributedStringGetAttributes(attributedString, effectiveRange.location + effectiveRange.length, &effectiveRange);
if (!attributes)
continue;
StringBuilder tagStart;
CFStringRef valueString;
String tagEnd;
CFIndex attributeCount = CFDictionaryGetCount(attributes);
Vector<const void*> keys(attributeCount);
Vector<const void*> values(attributeCount);
CFDictionaryGetKeysAndValues(attributes, keys.data(), values.data());
for (CFIndex i = 0; i < attributeCount; ++i) {
CFStringRef key = static_cast<CFStringRef>(keys[i]);
CFTypeRef value = values[i];
if (CFGetTypeID(key) != CFStringGetTypeID() || !CFStringGetLength(key))
continue;
if (CFStringCompare(key, kCMTextMarkupAttribute_Alignment, 0) == kCFCompareEqualTo) {
valueString = static_cast<CFStringRef>(value);
if (CFGetTypeID(valueString) != CFStringGetTypeID() || !CFStringGetLength(valueString))
continue;
if (processed & Align)
continue;
processed |= Align;
if (CFStringCompare(valueString, kCMTextMarkupAlignmentType_Start, 0) == kCFCompareEqualTo)
cueData->setAlign(GenericCueData::Start);
else if (CFStringCompare(valueString, kCMTextMarkupAlignmentType_Middle, 0) == kCFCompareEqualTo)
cueData->setAlign(GenericCueData::Middle);
else if (CFStringCompare(valueString, kCMTextMarkupAlignmentType_End, 0) == kCFCompareEqualTo)
cueData->setAlign(GenericCueData::End);
else
ASSERT_NOT_REACHED();
continue;
}
if (CFStringCompare(key, kCMTextMarkupAttribute_BoldStyle, 0) == kCFCompareEqualTo) {
if (static_cast<CFBooleanRef>(value) != kCFBooleanTrue)
continue;
tagStart.append("<b>");
tagEnd.insert("</b>", 0);
continue;
}
if (CFStringCompare(key, kCMTextMarkupAttribute_ItalicStyle, 0) == kCFCompareEqualTo) {
if (static_cast<CFBooleanRef>(value) != kCFBooleanTrue)
continue;
tagStart.append("<i>");
tagEnd.insert("</i>", 0);
continue;
}
if (CFStringCompare(key, kCMTextMarkupAttribute_UnderlineStyle, 0) == kCFCompareEqualTo) {
if (static_cast<CFBooleanRef>(value) != kCFBooleanTrue)
continue;
tagStart.append("<u>");
tagEnd.insert("</u>", 0);
continue;
}
if (CFStringCompare(key, kCMTextMarkupAttribute_OrthogonalLinePositionPercentageRelativeToWritingDirection, 0) == kCFCompareEqualTo) {
if (CFGetTypeID(value) != CFNumberGetTypeID())
continue;
if (processed & Line)
continue;
processed |= Line;
CFNumberRef valueNumber = static_cast<CFNumberRef>(value);
double line;
CFNumberGetValue(valueNumber, kCFNumberFloat64Type, &line);
cueData->setLine(line);
continue;
}
if (CFStringCompare(key, kCMTextMarkupAttribute_TextPositionPercentageRelativeToWritingDirection, 0) == kCFCompareEqualTo) {
if (CFGetTypeID(value) != CFNumberGetTypeID())
continue;
if (processed & Position)
continue;
processed |= Position;
CFNumberRef valueNumber = static_cast<CFNumberRef>(value);
double position;
CFNumberGetValue(valueNumber, kCFNumberFloat64Type, &position);
cueData->setPosition(position);
continue;
}
if (CFStringCompare(key, kCMTextMarkupAttribute_WritingDirectionSizePercentage, 0) == kCFCompareEqualTo) {
if (CFGetTypeID(value) != CFNumberGetTypeID())
continue;
if (processed & Size)
continue;
processed |= Size;
CFNumberRef valueNumber = static_cast<CFNumberRef>(value);
double size;
CFNumberGetValue(valueNumber, kCFNumberFloat64Type, &size);
cueData->setSize(size);
continue;
}
if (CFStringCompare(key, kCMTextMarkupAttribute_VerticalLayout, 0) == kCFCompareEqualTo) {
valueString = static_cast<CFStringRef>(value);
if (CFGetTypeID(valueString) != CFStringGetTypeID() || !CFStringGetLength(valueString))
continue;
if (CFStringCompare(valueString, kCMTextVerticalLayout_LeftToRight, 0) == kCFCompareEqualTo)
tagStart.append(leftToRightMark);
else if (CFStringCompare(valueString, kCMTextVerticalLayout_RightToLeft, 0) == kCFCompareEqualTo)
tagStart.append(rightToLeftMark);
continue;
}
if (CFStringCompare(key, kCMTextMarkupAttribute_BaseFontSizePercentageRelativeToVideoHeight, 0) == kCFCompareEqualTo) {
if (CFGetTypeID(value) != CFNumberGetTypeID())
continue;
CFNumberRef valueNumber = static_cast<CFNumberRef>(value);
double baseFontSize;
CFNumberGetValue(valueNumber, kCFNumberFloat64Type, &baseFontSize);
cueData->setBaseFontSize(baseFontSize);
continue;
}
if (CFStringCompare(key, kCMTextMarkupAttribute_RelativeFontSize, 0) == kCFCompareEqualTo) {
if (CFGetTypeID(value) != CFNumberGetTypeID())
continue;
CFNumberRef valueNumber = static_cast<CFNumberRef>(value);
double relativeFontSize;
CFNumberGetValue(valueNumber, kCFNumberFloat64Type, &relativeFontSize);
cueData->setRelativeFontSize(relativeFontSize);
continue;
}
if (CFStringCompare(key, kCMTextMarkupAttribute_FontFamilyName, 0) == kCFCompareEqualTo) {
valueString = static_cast<CFStringRef>(value);
if (CFGetTypeID(valueString) != CFStringGetTypeID() || !CFStringGetLength(valueString))
continue;
if (processed & FontName)
continue;
processed |= FontName;
cueData->setFontName(valueString);
continue;
}
if (CFStringCompare(key, kCMTextMarkupAttribute_ForegroundColorARGB, 0) == kCFCompareEqualTo) {
CFArrayRef arrayValue = static_cast<CFArrayRef>(value);
if (CFGetTypeID(arrayValue) != CFArrayGetTypeID())
continue;
RGBA32 color;
if (!makeRGBA32FromARGBCFArray(arrayValue, color))
continue;
cueData->setForegroundColor(color);
}
if (CFStringCompare(key, kCMTextMarkupAttribute_BackgroundColorARGB, 0) == kCFCompareEqualTo) {
CFArrayRef arrayValue = static_cast<CFArrayRef>(value);
if (CFGetTypeID(arrayValue) != CFArrayGetTypeID())
continue;
RGBA32 color;
if (!makeRGBA32FromARGBCFArray(arrayValue, color))
continue;
cueData->setBackgroundColor(color);
}
if (CFStringCompare(key, kCMTextMarkupAttribute_CharacterBackgroundColorARGB, 0) == kCFCompareEqualTo) {
CFArrayRef arrayValue = static_cast<CFArrayRef>(value);
if (CFGetTypeID(arrayValue) != CFArrayGetTypeID())
continue;
RGBA32 color;
if (!makeRGBA32FromARGBCFArray(arrayValue, color))
continue;
cueData->setHighlightColor(color);
}
}
content.append(tagStart);
content.append(attributedStringValue.substring(effectiveRange.location, effectiveRange.length));
content.append(tagEnd);
}
if (content.length())
cueData->setContent(content.toString());
}
