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Add support for text cue heights. 

Issue #832

Change-Id: Ifccbd6c6c46916d3d28ac4afaba01fc158c9c361
This commit is contained in:
Jacob Trimble 2020-12-01 11:32:39 -08:00
parent fe44b5e13c
commit c4a11aaed4
8 changed files with 52 additions and 19 deletions
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11
packager/media/base/text_sample.h
View File

@ -59,9 +59,14 @@ struct TextSettings {
/// The position offset of the cue. For horizontal cues, this is the
/// horizontal offset. Percent units are relative to the window.
base::Optional<TextNumber> position;
/// The size of the space used to draw text. For horizontal cues, this is the
/// width. Percent units are relative to the window.
base::Optional<TextNumber> size;
/// For horizontal cues, this is the width of the area to draw cues. For
/// vertical cues, this is the height. Percent units are relative to the
/// window.
base::Optional<TextNumber> width;
/// For horizontal cues, this is the height of the area to draw cues. For
/// vertical cues, this is the width. Percent units are relative to the
/// window.
base::Optional<TextNumber> height;
/// The region to draw the cue in.
std::string region;

26
packager/media/formats/ttml/ttml_generator.cc
View File

@ -16,6 +16,8 @@ namespace ttml {
namespace {
constexpr const char* kRegionIdPrefix = "_shaka_region_";
std::string ToTtmlTime(int64_t time, uint32_t timescale) {
int64_t remaining = time * 1000 / timescale;
@ -122,15 +124,31 @@ bool TtmlGenerator::AddSampleToXml(const TextSample& sample,
RCHECK(p.SetStringAttribute("xml:id", sample.id()));
const auto& settings = sample.settings();
if (!settings.region.empty())
RCHECK(p.SetStringAttribute("region", settings.region));
if (settings.line || settings.position) {
if (settings.line || settings.position || settings.width || settings.height) {
// TTML positioning needs to be from a region.
if (!settings.region.empty()) {
LOG(WARNING)
<< "Using both text regions and positioning isn't supported in TTML";
}
const auto origin = ToTtmlSize(
settings.position.value_or(TextNumber(0, TextUnitType::kPixels)),
settings.line.value_or(TextNumber(0, TextUnitType::kPixels)));
const auto extent = ToTtmlSize(
settings.width.value_or(TextNumber(100, TextUnitType::kPercent)),
settings.height.value_or(TextNumber(100, TextUnitType::kPercent)));
RCHECK(p.SetStringAttribute("tts:origin", origin));
const std::string id = kRegionIdPrefix + std::to_string(region_id_++);
xml::XmlNode region("region");
RCHECK(region.SetStringAttribute("xml:id", id));
RCHECK(region.SetStringAttribute("tts:origin", origin));
RCHECK(region.SetStringAttribute("tts:extent", extent));
RCHECK(p.SetStringAttribute("region", id));
RCHECK(body->AddChild(std::move(region)));
} else if (!settings.region.empty()) {
RCHECK(p.SetStringAttribute("region", settings.region));
}
if (settings.writing_direction != WritingDirection::kHorizontal) {
const char* dir =
settings.writing_direction == WritingDirection::kVerticalGrowingLeft

2
packager/media/formats/ttml/ttml_generator.h
View File

@ -48,6 +48,8 @@ class TtmlGenerator {
std::map<std::string, TextRegion> regions_;
std::string language_;
uint32_t time_scale_;
// This is modified in "const" methods to create unique IDs.
mutable uint32_t region_id_ = 0;
};
} // namespace ttml

6
packager/media/formats/ttml/ttml_generator_unittest.cc
View File

@ -190,8 +190,10 @@ TEST_F(TtmlMuxerTest, HandlesPosition) {
" <head/>\n"
" <body>\n"
" <div>\n"
" <region xml:id=\"_shaka_region_0\" tts:origin=\"30% 4em\" "
"tts:extent=\"100px 1em\"/>\n"
" <p xml:space=\"preserve\" begin=\"00:00:05.00\" "
"end=\"00:00:06.00\" tts:origin=\"30% 4em\">bar</p>\n"
"end=\"00:00:06.00\" region=\"_shaka_region_0\">bar</p>\n"
" </div>\n"
" </body>\n"
"</tt>\n";
@ -199,6 +201,8 @@ TEST_F(TtmlMuxerTest, HandlesPosition) {
TestProperties properties;
properties.settings.position.emplace(30, TextUnitType::kPercent);
properties.settings.line.emplace(4, TextUnitType::kLines);
properties.settings.width.emplace(100, TextUnitType::kPixels);
properties.settings.height.emplace(1, TextUnitType::kLines);
properties.body.body = "bar";
ParseSingleCue(kExpectedOutput, properties);

2
packager/media/formats/webvtt/webvtt_parser.cc
View File

@ -169,7 +169,7 @@ void ParseSettings(const std::string& id,
} else if (id == "size") {
float temp;
if (ParsePercent(value, &temp)) {
settings->size.emplace(temp, TextUnitType::kPercent);
settings->width.emplace(temp, TextUnitType::kPercent);
} else {
LOG(WARNING) << "Invalid WebVTT size: " << value;
}

11
packager/media/formats/webvtt/webvtt_parser_unittest.cc
View File

@ -201,7 +201,8 @@ TEST_F(WebVttParserTest, ParseOneCue) {
const auto& settings = samples_[0]->settings();
EXPECT_FALSE(settings.line);
EXPECT_FALSE(settings.position);
EXPECT_FALSE(settings.size);
EXPECT_FALSE(settings.width);
EXPECT_FALSE(settings.height);
EXPECT_EQ(settings.region, "");
EXPECT_EQ(settings.writing_direction, WritingDirection::kHorizontal);
EXPECT_EQ(settings.text_alignment, TextAlignment::kCenter);
@ -320,9 +321,9 @@ TEST_F(WebVttParserTest, ParseSettingSize) {
ASSERT_EQ(streams_.size(), 1u);
ASSERT_EQ(samples_.size(), 1u);
ASSERT_TRUE(samples_[0]->settings().size);
EXPECT_EQ(samples_[0]->settings().size->type, TextUnitType::kPercent);
EXPECT_EQ(samples_[0]->settings().size->value, 50.0f);
ASSERT_TRUE(samples_[0]->settings().width);
EXPECT_EQ(samples_[0]->settings().width->type, TextUnitType::kPercent);
EXPECT_EQ(samples_[0]->settings().width->value, 50.0f);
}
TEST_F(WebVttParserTest, ParseOneCueWithManySettings) {
@ -343,7 +344,7 @@ TEST_F(WebVttParserTest, ParseOneCueWithManySettings) {
EXPECT_EQ(samples_[0]->settings().writing_direction,
WritingDirection::kVerticalGrowingRight);
EXPECT_EQ(samples_[0]->settings().text_alignment, TextAlignment::kRight);
EXPECT_FALSE(samples_[0]->settings().size);
EXPECT_FALSE(samples_[0]->settings().width);
ASSERT_TRUE(samples_[0]->settings().position);
EXPECT_EQ(samples_[0]->settings().position->type, TextUnitType::kPercent);
EXPECT_EQ(samples_[0]->settings().position->value, 20.0f);

11
packager/media/formats/webvtt/webvtt_utils.cc
View File

@ -215,15 +215,18 @@ std::string WebVttSettingsToString(const TextSettings& settings) {
LOG(WARNING) << "WebVTT only supports percent position settings";
}
}
if (settings.size) {
if (settings.size->type == TextUnitType::kPercent) {
if (settings.width) {
if (settings.width->type == TextUnitType::kPercent) {
ret += " size:";
ret += base::DoubleToString(settings.size->value);
ret += base::DoubleToString(settings.width->value);
ret += "%";
} else {
LOG(WARNING) << "WebVTT only supports percent size settings";
LOG(WARNING) << "WebVTT only supports percent width settings";
}
}
if (settings.height) {
LOG(WARNING) << "WebVTT doesn't support cue heights";
}
if (settings.writing_direction != WritingDirection::kHorizontal) {
ret += " direction:";
if (settings.writing_direction == WritingDirection::kVerticalGrowingLeft) {

2
packager/media/formats/webvtt/webvtt_utils_unittest.cc
View File

@ -151,7 +151,7 @@ TEST(WebVttUtilsTest, SettingsToString) {
settings.region = "foo";
settings.line = TextNumber(27, TextUnitType::kPercent);
settings.position = TextNumber(42, TextUnitType::kPercent);
settings.size = TextNumber(54, TextUnitType::kPercent);
settings.width = TextNumber(54, TextUnitType::kPercent);
settings.writing_direction = WritingDirection::kVerticalGrowingLeft;
settings.text_alignment = TextAlignment::kEnd;