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// Copyright 2016 The Draco Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "draco/compression/point_cloud/point_cloud_decoder.h"
#include "draco/metadata/metadata_decoder.h"
namespace draco {
PointCloudDecoder::PointCloudDecoder()
: point_cloud_(nullptr),
buffer_(nullptr),
version_major_(0),
version_minor_(0),
options_(nullptr) {}
Status PointCloudDecoder::DecodeHeader(DecoderBuffer *buffer,
DracoHeader *out_header) {
constexpr char kIoErrorMsg[] = "Failed to parse Draco header.";
if (!buffer->Decode(out_header->draco_string, 5)) {
return Status(Status::IO_ERROR, kIoErrorMsg);
}
if (memcmp(out_header->draco_string, "DRACO", 5) != 0) {
return Status(Status::DRACO_ERROR, "Not a Draco file.");
}
if (!buffer->Decode(&(out_header->version_major))) {
return Status(Status::IO_ERROR, kIoErrorMsg);
}
if (!buffer->Decode(&(out_header->version_minor))) {
return Status(Status::IO_ERROR, kIoErrorMsg);
}
if (!buffer->Decode(&(out_header->encoder_type))) {
return Status(Status::IO_ERROR, kIoErrorMsg);
}
if (!buffer->Decode(&(out_header->encoder_method))) {
return Status(Status::IO_ERROR, kIoErrorMsg);
}
if (!buffer->Decode(&(out_header->flags))) {
return Status(Status::IO_ERROR, kIoErrorMsg);
}
return OkStatus();
}
Status PointCloudDecoder::DecodeMetadata() {
std::unique_ptr<GeometryMetadata> metadata =
std::unique_ptr<GeometryMetadata>(new GeometryMetadata());
MetadataDecoder metadata_decoder;
if (!metadata_decoder.DecodeGeometryMetadata(buffer_, metadata.get())) {
return Status(Status::DRACO_ERROR, "Failed to decode metadata.");
}
point_cloud_->AddMetadata(std::move(metadata));
return OkStatus();
}
Status PointCloudDecoder::Decode(const DecoderOptions &options,
DecoderBuffer *in_buffer,
PointCloud *out_point_cloud) {
options_ = &options;
buffer_ = in_buffer;
point_cloud_ = out_point_cloud;
DracoHeader header;
DRACO_RETURN_IF_ERROR(DecodeHeader(buffer_, &header))
// Sanity check that we are really using the right decoder (mostly for cases
// where the Decode method was called manually outside of our main API.
if (header.encoder_type != GetGeometryType()) {
return Status(Status::DRACO_ERROR,
"Using incompatible decoder for the input geometry.");
}
// TODO(ostava): We should check the method as well, but currently decoders
// don't expose the decoding method id.
version_major_ = header.version_major;
version_minor_ = header.version_minor;
const uint8_t max_supported_major_version =
header.encoder_type == POINT_CLOUD ? kDracoPointCloudBitstreamVersionMajor
: kDracoMeshBitstreamVersionMajor;
const uint8_t max_supported_minor_version =
header.encoder_type == POINT_CLOUD ? kDracoPointCloudBitstreamVersionMinor
: kDracoMeshBitstreamVersionMinor;
// Check for version compatibility.
if (version_major_ < 1 || version_major_ > max_supported_major_version) {
return Status(Status::UNKNOWN_VERSION, "Unknown major version.");
}
if (version_major_ == max_supported_major_version &&
version_minor_ > max_supported_minor_version) {
return Status(Status::UNKNOWN_VERSION, "Unknown minor version.");
}
buffer_->set_bitstream_version(
DRACO_BITSTREAM_VERSION(version_major_, version_minor_));
if (bitstream_version() >= DRACO_BITSTREAM_VERSION(1, 3) &&
(header.flags & METADATA_FLAG_MASK)) {
DRACO_RETURN_IF_ERROR(DecodeMetadata())
}
if (!InitializeDecoder()) {
return Status(Status::DRACO_ERROR, "Failed to initialize the decoder.");
}
if (!DecodeGeometryData()) {
return Status(Status::DRACO_ERROR, "Failed to decode geometry data.");
}
if (!DecodePointAttributes()) {
return Status(Status::DRACO_ERROR, "Failed to decode point attributes.");
}
return OkStatus();
}
bool PointCloudDecoder::DecodePointAttributes() {
uint8_t num_attributes_decoders;
if (!buffer_->Decode(&num_attributes_decoders)) {
return false;
}
// Create all attribute decoders. This is implementation specific and the
// derived classes can use any data encoded in the
// PointCloudEncoder::EncodeAttributesEncoderIdentifier() call.
for (int i = 0; i < num_attributes_decoders; ++i) {
if (!CreateAttributesDecoder(i)) {
return false;
}
}
// Initialize all attributes decoders. No data is decoded here.
for (auto &att_dec : attributes_decoders_) {
if (!att_dec->Init(this, point_cloud_)) {
return false;
}
}
// Decode any data needed by the attribute decoders.
for (int i = 0; i < num_attributes_decoders; ++i) {
if (!attributes_decoders_[i]->DecodeAttributesDecoderData(buffer_)) {
return false;
}
}
// Create map between attribute and decoder ids.
for (int i = 0; i < num_attributes_decoders; ++i) {
const int32_t num_attributes = attributes_decoders_[i]->GetNumAttributes();
for (int j = 0; j < num_attributes; ++j) {
int att_id = attributes_decoders_[i]->GetAttributeId(j);
if (att_id >= attribute_to_decoder_map_.size()) {
attribute_to_decoder_map_.resize(att_id + 1);
}
attribute_to_decoder_map_[att_id] = i;
}
}
// Decode the actual attributes using the created attribute decoders.
if (!DecodeAllAttributes()) {
return false;
}
if (!OnAttributesDecoded()) {
return false;
}
return true;
}
bool PointCloudDecoder::DecodeAllAttributes() {
for (auto &att_dec : attributes_decoders_) {
if (!att_dec->DecodeAttributes(buffer_)) {
return false;
}
}
return true;
}
const PointAttribute *PointCloudDecoder::GetPortableAttribute(
int32_t parent_att_id) {
if (parent_att_id < 0 || parent_att_id >= point_cloud_->num_attributes()) {
return nullptr;
}
const int32_t parent_att_decoder_id =
attribute_to_decoder_map_[parent_att_id];
return attributes_decoders_[parent_att_decoder_id]->GetPortableAttribute(
parent_att_id);
}
} // namespace draco
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