| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "media/webm/webm_content_encodings_client.h" |
| |
| #include "base/logging.h" |
| #include "base/stl_util.h" |
| #include "media/webm/webm_constants.h" |
| |
| namespace media { |
| |
| WebMContentEncodingsClient::WebMContentEncodingsClient() |
| : content_encryption_encountered_(false), |
| content_encodings_ready_(false) { |
| } |
| |
| WebMContentEncodingsClient::~WebMContentEncodingsClient() { |
| STLDeleteElements(&content_encodings_); |
| } |
| |
| const ContentEncodings& WebMContentEncodingsClient::content_encodings() const { |
| DCHECK(content_encodings_ready_); |
| return content_encodings_; |
| } |
| |
| WebMParserClient* WebMContentEncodingsClient::OnListStart(int id) { |
| if (id == kWebMIdContentEncodings) { |
| DCHECK(!cur_content_encoding_.get()); |
| DCHECK(!content_encryption_encountered_); |
| STLDeleteElements(&content_encodings_); |
| content_encodings_ready_ = false; |
| return this; |
| } |
| |
| if (id == kWebMIdContentEncoding) { |
| DCHECK(!cur_content_encoding_.get()); |
| DCHECK(!content_encryption_encountered_); |
| cur_content_encoding_.reset(new ContentEncoding()); |
| return this; |
| } |
| |
| if (id == kWebMIdContentEncryption) { |
| DCHECK(cur_content_encoding_.get()); |
| if (content_encryption_encountered_) { |
| DVLOG(1) << "Unexpected multiple ContentEncryption."; |
| return NULL; |
| } |
| content_encryption_encountered_ = true; |
| return this; |
| } |
| |
| // This should not happen if WebMListParser is working properly. |
| DCHECK(false); |
| return NULL; |
| } |
| |
| // Mandatory occurrence restriction is checked in this function. Multiple |
| // occurrence restriction is checked in OnUInt and OnBinary. |
| bool WebMContentEncodingsClient::OnListEnd(int id) { |
| if (id == kWebMIdContentEncodings) { |
| // ContentEncoding element is mandatory. Check this! |
| if (content_encodings_.empty()) { |
| DVLOG(1) << "Missing ContentEncoding."; |
| return false; |
| } |
| content_encodings_ready_ = true; |
| return true; |
| } |
| |
| if (id == kWebMIdContentEncoding) { |
| DCHECK(cur_content_encoding_.get()); |
| |
| // |
| // Specify default values to missing mandatory elements. |
| // |
| |
| if (cur_content_encoding_->order() == ContentEncoding::kOrderInvalid) { |
| // Default value of encoding order is 0, which should only be used on the |
| // first ContentEncoding. |
| if (!content_encodings_.empty()) { |
| DVLOG(1) << "Missing ContentEncodingOrder."; |
| return false; |
| } |
| cur_content_encoding_->set_order(0); |
| } |
| |
| if (cur_content_encoding_->scope() == ContentEncoding::kScopeInvalid) |
| cur_content_encoding_->set_scope(ContentEncoding::kScopeAllFrameContents); |
| |
| if (cur_content_encoding_->type() == ContentEncoding::kTypeInvalid) |
| cur_content_encoding_->set_type(ContentEncoding::kTypeCompression); |
| |
| // Check for elements valid in spec but not supported for now. |
| if (cur_content_encoding_->type() == ContentEncoding::kTypeCompression) { |
| DVLOG(1) << "ContentCompression not supported."; |
| return false; |
| } |
| |
| // Enforce mandatory elements without default values. |
| DCHECK(cur_content_encoding_->type() == ContentEncoding::kTypeEncryption); |
| if (!content_encryption_encountered_) { |
| DVLOG(1) << "ContentEncodingType is encryption but ContentEncryption " |
| "is missing."; |
| return false; |
| } |
| |
| content_encodings_.push_back(cur_content_encoding_.release()); |
| content_encryption_encountered_ = false; |
| return true; |
| } |
| |
| if (id == kWebMIdContentEncryption) { |
| DCHECK(cur_content_encoding_.get()); |
| // Specify default value for elements that are not present. |
| if (cur_content_encoding_->encryption_algo() == |
| ContentEncoding::kEncAlgoInvalid) { |
| cur_content_encoding_->set_encryption_algo( |
| ContentEncoding::kEncAlgoNotEncrypted); |
| } |
| return true; |
| } |
| |
| // This should not happen if WebMListParser is working properly. |
| DCHECK(false); |
| return false; |
| } |
| |
| // Multiple occurrence restriction and range are checked in this function. |
| // Mandatory occurrence restriction is checked in OnListEnd. |
| bool WebMContentEncodingsClient::OnUInt(int id, int64 val) { |
| DCHECK(cur_content_encoding_.get()); |
| |
| if (id == kWebMIdContentEncodingOrder) { |
| if (cur_content_encoding_->order() != ContentEncoding::kOrderInvalid) { |
| DVLOG(1) << "Unexpected multiple ContentEncodingOrder."; |
| return false; |
| } |
| |
| if (val != static_cast<int64>(content_encodings_.size())) { |
| // According to the spec, encoding order starts with 0 and counts upwards. |
| DVLOG(1) << "Unexpected ContentEncodingOrder."; |
| return false; |
| } |
| |
| cur_content_encoding_->set_order(val); |
| return true; |
| } |
| |
| if (id == kWebMIdContentEncodingScope) { |
| if (cur_content_encoding_->scope() != ContentEncoding::kScopeInvalid) { |
| DVLOG(1) << "Unexpected multiple ContentEncodingScope."; |
| return false; |
| } |
| |
| if (val == ContentEncoding::kScopeInvalid || |
| val > ContentEncoding::kScopeMax) { |
| DVLOG(1) << "Unexpected ContentEncodingScope."; |
| return false; |
| } |
| |
| if (val & ContentEncoding::kScopeNextContentEncodingData) { |
| DVLOG(1) << "Encoded next ContentEncoding is not supported."; |
| return false; |
| } |
| |
| cur_content_encoding_->set_scope(static_cast<ContentEncoding::Scope>(val)); |
| return true; |
| } |
| |
| if (id == kWebMIdContentEncodingType) { |
| if (cur_content_encoding_->type() != ContentEncoding::kTypeInvalid) { |
| DVLOG(1) << "Unexpected multiple ContentEncodingType."; |
| return false; |
| } |
| |
| if (val == ContentEncoding::kTypeCompression) { |
| DVLOG(1) << "ContentCompression not supported."; |
| return false; |
| } |
| |
| if (val != ContentEncoding::kTypeEncryption) { |
| DVLOG(1) << "Unexpected ContentEncodingType " << val << "."; |
| return false; |
| } |
| |
| cur_content_encoding_->set_type(static_cast<ContentEncoding::Type>(val)); |
| return true; |
| } |
| |
| if (id == kWebMIdContentEncAlgo) { |
| if (cur_content_encoding_->encryption_algo() != |
| ContentEncoding::kEncAlgoInvalid) { |
| DVLOG(1) << "Unexpected multiple ContentEncAlgo."; |
| return false; |
| } |
| |
| if (val < ContentEncoding::kEncAlgoNotEncrypted || |
| val > ContentEncoding::kEncAlgoAes) { |
| DVLOG(1) << "Unexpected ContentEncAlgo " << val << "."; |
| return false; |
| } |
| |
| cur_content_encoding_->set_encryption_algo( |
| static_cast<ContentEncoding::EncryptionAlgo>(val)); |
| return true; |
| } |
| |
| // This should not happen if WebMListParser is working properly. |
| DCHECK(false); |
| return false; |
| } |
| |
| // Multiple occurrence restriction is checked in this function. Mandatory |
| // restriction is checked in OnListEnd. |
| bool WebMContentEncodingsClient::OnBinary(int id, const uint8* data, int size) { |
| DCHECK(cur_content_encoding_.get()); |
| DCHECK(data); |
| DCHECK_GT(size, 0); |
| |
| if (id == kWebMIdContentEncKeyID) { |
| if (cur_content_encoding_->encryption_key_id() || |
| cur_content_encoding_->encryption_key_id_size()) { |
| DVLOG(1) << "Unexpected multiple ContentEncKeyID"; |
| return false; |
| } |
| cur_content_encoding_->SetEncryptionKeyId(data, size); |
| return true; |
| } |
| |
| // This should not happen if WebMListParser is working properly. |
| DCHECK(false); |
| return false; |
| } |
| |
| } // namespace media |