241 lines
8.2 KiB
C++
241 lines
8.2 KiB
C++
// Copyright 2020 Google LLC. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#include <packager/media/formats/ttml/ttml_generator.h>
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#include <absl/strings/escaping.h>
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#include <absl/strings/str_format.h>
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#include <packager/media/base/rcheck.h>
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namespace shaka {
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namespace media {
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namespace ttml {
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namespace {
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constexpr const char* kRegionIdPrefix = "_shaka_region_";
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std::string ToTtmlTime(int64_t time, int32_t timescale) {
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int64_t remaining = time * 1000 / timescale;
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const int ms = remaining % 1000;
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remaining /= 1000;
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const int sec = remaining % 60;
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remaining /= 60;
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const int min = remaining % 60;
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remaining /= 60;
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const int hr = remaining;
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return absl::StrFormat("%02d:%02d:%02d.%03d", hr, min, sec, ms);
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}
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std::string ToTtmlSize(const TextNumber& x, const TextNumber& y) {
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const char* kSuffixMap[] = {"px", "em", "%"};
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return absl::StrFormat("%.0f%s %.0f%s", x.value,
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kSuffixMap[static_cast<int>(x.type)], y.value,
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kSuffixMap[static_cast<int>(y.type)]);
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}
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} // namespace
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const char* TtmlGenerator::kTtNamespace = "http://www.w3.org/ns/ttml";
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TtmlGenerator::TtmlGenerator() {}
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TtmlGenerator::~TtmlGenerator() {}
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void TtmlGenerator::Initialize(const std::map<std::string, TextRegion>& regions,
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const std::string& language,
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int32_t time_scale) {
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regions_ = regions;
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language_ = language;
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time_scale_ = time_scale;
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}
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void TtmlGenerator::AddSample(const TextSample& sample) {
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samples_.emplace_back(sample);
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}
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void TtmlGenerator::Reset() {
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samples_.clear();
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}
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bool TtmlGenerator::Dump(std::string* result) const {
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xml::XmlNode root("tt");
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RCHECK(root.SetStringAttribute("xmlns", kTtNamespace));
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RCHECK(root.SetStringAttribute("xmlns:tts",
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"http://www.w3.org/ns/ttml#styling"));
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bool did_log = false;
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xml::XmlNode head("head");
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RCHECK(root.SetStringAttribute("xml:lang", language_));
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for (const auto& pair : regions_) {
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if (!did_log && (pair.second.region_anchor_x.value != 0 &&
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pair.second.region_anchor_y.value != 0)) {
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LOG(WARNING) << "TTML doesn't support non-0 region anchor";
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did_log = true;
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}
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xml::XmlNode region("region");
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const auto origin =
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ToTtmlSize(pair.second.window_anchor_x, pair.second.window_anchor_y);
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const auto extent = ToTtmlSize(pair.second.width, pair.second.height);
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RCHECK(region.SetStringAttribute("xml:id", pair.first));
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RCHECK(region.SetStringAttribute("tts:origin", origin));
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RCHECK(region.SetStringAttribute("tts:extent", extent));
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RCHECK(head.AddChild(std::move(region)));
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}
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RCHECK(root.AddChild(std::move(head)));
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size_t image_count = 0;
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xml::XmlNode metadata("metadata");
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xml::XmlNode body("body");
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xml::XmlNode div("div");
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for (const auto& sample : samples_) {
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RCHECK(AddSampleToXml(sample, &div, &metadata, &image_count));
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}
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RCHECK(body.AddChild(std::move(div)));
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if (image_count > 0) {
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RCHECK(root.SetStringAttribute(
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"xmlns:smpte", "http://www.smpte-ra.org/schemas/2052-1/2010/smpte-tt"));
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RCHECK(root.AddChild(std::move(metadata)));
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}
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RCHECK(root.AddChild(std::move(body)));
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*result = root.ToString(/* comment= */ "");
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return true;
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}
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bool TtmlGenerator::AddSampleToXml(const TextSample& sample,
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xml::XmlNode* body,
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xml::XmlNode* metadata,
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size_t* image_count) const {
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xml::XmlNode p("p");
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RCHECK(p.SetStringAttribute("xml:space", "preserve"));
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RCHECK(p.SetStringAttribute("begin",
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ToTtmlTime(sample.start_time(), time_scale_)));
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RCHECK(
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p.SetStringAttribute("end", ToTtmlTime(sample.EndTime(), time_scale_)));
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RCHECK(ConvertFragmentToXml(sample.body(), &p, metadata, image_count));
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if (!sample.id().empty())
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RCHECK(p.SetStringAttribute("xml:id", sample.id()));
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const auto& settings = sample.settings();
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if (settings.line || settings.position || settings.width || settings.height) {
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// TTML positioning needs to be from a region.
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if (!settings.region.empty()) {
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LOG(WARNING)
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<< "Using both text regions and positioning isn't supported in TTML";
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}
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const auto origin = ToTtmlSize(
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settings.position.value_or(TextNumber(0, TextUnitType::kPixels)),
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settings.line.value_or(TextNumber(0, TextUnitType::kPixels)));
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const auto extent = ToTtmlSize(
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settings.width.value_or(TextNumber(100, TextUnitType::kPercent)),
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settings.height.value_or(TextNumber(100, TextUnitType::kPercent)));
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const std::string id = kRegionIdPrefix + std::to_string(region_id_++);
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xml::XmlNode region("region");
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RCHECK(region.SetStringAttribute("xml:id", id));
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RCHECK(region.SetStringAttribute("tts:origin", origin));
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RCHECK(region.SetStringAttribute("tts:extent", extent));
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RCHECK(p.SetStringAttribute("region", id));
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RCHECK(body->AddChild(std::move(region)));
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} else if (!settings.region.empty()) {
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RCHECK(p.SetStringAttribute("region", settings.region));
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}
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if (settings.writing_direction != WritingDirection::kHorizontal) {
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const char* dir =
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settings.writing_direction == WritingDirection::kVerticalGrowingLeft
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? "tbrl"
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: "tblr";
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RCHECK(p.SetStringAttribute("tts:writingMode", dir));
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}
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if (settings.text_alignment != TextAlignment::kStart) {
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switch (settings.text_alignment) {
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case TextAlignment::kStart: // To avoid compiler warning.
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case TextAlignment::kCenter:
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RCHECK(p.SetStringAttribute("tts:textAlign", "center"));
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break;
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case TextAlignment::kEnd:
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RCHECK(p.SetStringAttribute("tts:textAlign", "end"));
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break;
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case TextAlignment::kLeft:
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RCHECK(p.SetStringAttribute("tts:textAlign", "left"));
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break;
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case TextAlignment::kRight:
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RCHECK(p.SetStringAttribute("tts:textAlign", "right"));
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break;
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}
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}
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RCHECK(body->AddChild(std::move(p)));
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return true;
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}
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bool TtmlGenerator::ConvertFragmentToXml(const TextFragment& body,
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xml::XmlNode* parent,
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xml::XmlNode* metadata,
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size_t* image_count) const {
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if (body.newline) {
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xml::XmlNode br("br");
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return parent->AddChild(std::move(br));
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}
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// If we have new styles, add a new <span>.
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xml::XmlNode span("span");
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xml::XmlNode* node = parent;
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if (body.style.bold || body.style.italic || body.style.underline) {
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node = &span;
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if (body.style.bold) {
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RCHECK(span.SetStringAttribute("tts:fontWeight",
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*body.style.bold ? "bold" : "normal"));
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}
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if (body.style.italic) {
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RCHECK(span.SetStringAttribute("tts:fontStyle",
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*body.style.italic ? "italic" : "normal"));
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}
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if (body.style.underline) {
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RCHECK(span.SetStringAttribute(
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"tts:textDecoration",
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*body.style.underline ? "underline" : "noUnderline"));
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}
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}
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if (!body.body.empty()) {
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node->AddContent(body.body);
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} else if (!body.image.empty()) {
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std::string image_data(body.image.begin(), body.image.end());
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std::string base64_data;
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absl::Base64Escape(image_data, &base64_data);
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std::string id = "img_" + std::to_string(++*image_count);
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xml::XmlNode image_xml("smpte:image");
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RCHECK(image_xml.SetStringAttribute("imageType", "PNG"));
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RCHECK(image_xml.SetStringAttribute("encoding", "Base64"));
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RCHECK(image_xml.SetStringAttribute("xml:id", id));
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image_xml.SetContent(base64_data);
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RCHECK(metadata->AddChild(std::move(image_xml)));
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RCHECK(node->SetStringAttribute("smpte:backgroundImage", "#" + id));
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} else {
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for (const auto& frag : body.sub_fragments) {
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if (!ConvertFragmentToXml(frag, node, metadata, image_count))
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return false;
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}
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}
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if (body.style.bold || body.style.italic || body.style.underline)
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RCHECK(parent->AddChild(std::move(span)));
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return true;
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}
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} // namespace ttml
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} // namespace media
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} // namespace shaka
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