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Add initial rotation and scale_x, scale_y keyframes when adding a new clip for a file with "rotate" metadata.

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Jonathan Thomas
2025-03-11 18:28:28 -05:00
parent 56974b33c1
commit 37bdcacddf
1 changed files with 26 additions and 11 deletions
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37
src/Clip.cpp
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@@ -111,24 +111,39 @@ void Clip::init_reader_settings() {
}
}
// Init reader's rotation (if any)
void Clip::init_reader_rotation() {
// Dont init rotation if clip has keyframes
// Don't init rotation if clip already has keyframes.
if (rotation.GetCount() > 0)
return;
// Init rotation
// Get rotation from metadata (if any)
float rotate_angle = 0.0f;
if (reader && reader->info.metadata.count("rotate") > 0) {
// Use reader metadata rotation (if any)
// This is typical with cell phone videos filmed in different orientations
try {
float rotate_metadata = strtof(reader->info.metadata["rotate"].c_str(), 0);
rotation = Keyframe(rotate_metadata);
} catch (const std::exception& e) {}
rotate_angle = strtof(reader->info.metadata["rotate"].c_str(), nullptr);
} catch (const std::exception& e) {
// Leave rotate_angle at default 0.0f
}
}
else
// Default no rotation
rotation = Keyframe(0.0);
rotation = Keyframe(rotate_angle);
// Compute uniform scale factors for rotated video.
// Assume reader->info.width and reader->info.height are the clip's natural dimensions.
float w = static_cast<float>(reader->info.width);
float h = static_cast<float>(reader->info.height);
float rad = rotate_angle * M_PI / 180.0f;
// Calculate the dimensions of the bounding box for the rotated clip.
float new_width = fabs(w * cos(rad)) + fabs(h * sin(rad));
float new_height = fabs(w * sin(rad)) + fabs(h * cos(rad));
// To have the rotated clip appear the same size as the unrotated clip,
// compute a uniform scale factor S that brings the bounding box back to (w, h).
float uniform_scale = std::min(w / new_width, h / new_height);
// Set scale keyframes uniformly.
scale_x = Keyframe(uniform_scale);
scale_y = Keyframe(uniform_scale);
}
// Default Constructor for a clip