blob: 35749ebb445e47874c02f72f20614598e80b1fc8 [file] [log] [blame]
// Copyright 2014 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/formats/webm/webm_content_encodings_client.h"
#include "base/logging.h"
#include "media/formats/webm/webm_constants.h"
namespace media {
WebMContentEncodingsClient::WebMContentEncodingsClient(MediaLog* media_log)
: media_log_(media_log),
content_encryption_encountered_(false),
content_encodings_ready_(false) {}
WebMContentEncodingsClient::~WebMContentEncodingsClient() = default;
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_);
content_encodings_.clear();
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_) {
MEDIA_LOG(ERROR, media_log_) << "Unexpected multiple ContentEncryption.";
return NULL;
}
content_encryption_encountered_ = true;
return this;
}
if (id == kWebMIdContentEncAESSettings) {
DCHECK(cur_content_encoding_.get());
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()) {
MEDIA_LOG(ERROR, media_log_) << "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()) {
MEDIA_LOG(ERROR, media_log_) << "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) {
MEDIA_LOG(ERROR, media_log_) << "ContentCompression not supported.";
return false;
}
// Enforce mandatory elements without default values.
DCHECK(cur_content_encoding_->type() == ContentEncoding::kTypeEncryption);
if (!content_encryption_encountered_) {
MEDIA_LOG(ERROR, media_log_) << "ContentEncodingType is encryption but"
<< " ContentEncryption is missing.";
return false;
}
content_encodings_.push_back(std::move(cur_content_encoding_));
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;
}
if (id == kWebMIdContentEncAESSettings) {
if (cur_content_encoding_->cipher_mode() ==
ContentEncoding::kCipherModeInvalid)
cur_content_encoding_->set_cipher_mode(ContentEncoding::kCipherModeCtr);
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_t val) {
DCHECK(cur_content_encoding_.get());
if (id == kWebMIdContentEncodingOrder) {
if (cur_content_encoding_->order() != ContentEncoding::kOrderInvalid) {
MEDIA_LOG(ERROR, media_log_)
<< "Unexpected multiple ContentEncodingOrder.";
return false;
}
if (val != static_cast<int64_t>(content_encodings_.size())) {
// According to the spec, encoding order starts with 0 and counts upwards.
MEDIA_LOG(ERROR, media_log_) << "Unexpected ContentEncodingOrder.";
return false;
}
cur_content_encoding_->set_order(val);
return true;
}
if (id == kWebMIdContentEncodingScope) {
if (cur_content_encoding_->scope() != ContentEncoding::kScopeInvalid) {
MEDIA_LOG(ERROR, media_log_)
<< "Unexpected multiple ContentEncodingScope.";
return false;
}
if (val == ContentEncoding::kScopeInvalid ||
val > ContentEncoding::kScopeMax) {
MEDIA_LOG(ERROR, media_log_) << "Unexpected ContentEncodingScope.";
return false;
}
if (val & ContentEncoding::kScopeNextContentEncodingData) {
MEDIA_LOG(ERROR, media_log_) << "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) {
MEDIA_LOG(ERROR, media_log_)
<< "Unexpected multiple ContentEncodingType.";
return false;
}
if (val == ContentEncoding::kTypeCompression) {
MEDIA_LOG(ERROR, media_log_) << "ContentCompression not supported.";
return false;
}
if (val != ContentEncoding::kTypeEncryption) {
MEDIA_LOG(ERROR, media_log_) << "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) {
MEDIA_LOG(ERROR, media_log_) << "Unexpected multiple ContentEncAlgo.";
return false;
}
if (val < ContentEncoding::kEncAlgoNotEncrypted ||
val > ContentEncoding::kEncAlgoAes) {
MEDIA_LOG(ERROR, media_log_) << "Unexpected ContentEncAlgo " << val
<< ".";
return false;
}
cur_content_encoding_->set_encryption_algo(
static_cast<ContentEncoding::EncryptionAlgo>(val));
return true;
}
if (id == kWebMIdAESSettingsCipherMode) {
if (cur_content_encoding_->cipher_mode() !=
ContentEncoding::kCipherModeInvalid) {
MEDIA_LOG(ERROR, media_log_)
<< "Unexpected multiple AESSettingsCipherMode.";
return false;
}
if (val != ContentEncoding::kCipherModeCtr) {
MEDIA_LOG(ERROR, media_log_) << "Unexpected AESSettingsCipherMode " << val
<< ".";
return false;
}
cur_content_encoding_->set_cipher_mode(
static_cast<ContentEncoding::CipherMode>(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_t* data,
int size) {
DCHECK(cur_content_encoding_.get());
DCHECK(data);
DCHECK_GT(size, 0);
if (id == kWebMIdContentEncKeyID) {
if (!cur_content_encoding_->encryption_key_id().empty()) {
MEDIA_LOG(ERROR, media_log_) << "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