bool
UsdUtilsStitchClips(const SdfLayerHandle& resultLayer,
const _ClipFileVector& clipLayerFiles,
const SdfPath& clipPath,
const double startTimeCode,
const double endTimeCode,
const TfToken& clipSet)
{
// XXX: See comment in UsdUtilsStitchClipsTopology above.
TF_PY_ALLOW_THREADS_IN_SCOPE();
// Prepare result layer for editing
if (!_LayerIsWritable(resultLayer)) {
return false;
} else {
resultLayer->Clear();
}
// Prepare topology layer for editing, create if necessary
bool topologyPreExisting = true;
std::string topologyLayerId
= UsdUtilsGenerateClipTopologyName(resultLayer->GetIdentifier());
SdfLayerRefPtr topologyLayer = SdfLayer::FindOrOpen(topologyLayerId);
if (!topologyLayer) {
topologyPreExisting = false;
topologyLayer = SdfLayer::CreateNew(topologyLayerId);
}
if (!_LayerIsWritable(topologyLayer)) {
return false;
} else {
topologyLayer->Clear();
}
// Open all clip layers and validate clipPath
SdfLayerRefPtrVector clipLayers;
const bool clipLayersAreValid
= _OpenClipLayers(&clipLayers, clipLayerFiles, clipPath);
if (!clipLayersAreValid
|| !_UsdUtilsStitchClipsImpl(resultLayer, topologyLayer,
clipLayers, clipPath,
startTimeCode, endTimeCode,
clipSet)) {
if (!topologyPreExisting) {
TfDeleteFile(topologyLayer->GetIdentifier());
}
return false;
}
// Note that we don't apply edits until all other
// actions have completed.
topologyLayer->Save();
resultLayer->Save();
return true;
}
