217 lines
8.0 KiB
C++
217 lines
8.0 KiB
C++
// Copyright 2014 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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//
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// Classes to wrap XML operations. XmlNode is a generic wrapper class for
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// XmlNode in libxml2. There are also MPD XML specific classes as well.
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#ifndef MPD_BASE_XML_XML_NODE_H_
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#define MPD_BASE_XML_XML_NODE_H_
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#include <libxml/tree.h>
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#include <stdint.h>
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#include <list>
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#include <set>
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#include "packager/base/macros.h"
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#include "packager/mpd/base/content_protection_element.h"
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#include "packager/mpd/base/media_info.pb.h"
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#include "packager/mpd/base/xml/scoped_xml_ptr.h"
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namespace shaka {
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struct SegmentInfo;
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namespace xml {
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/// These classes are wrapper classes for XML elements for generating MPD.
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/// None of the pointer parameters should be NULL. None of the methods are meant
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/// to be overridden.
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class XmlNode {
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public:
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/// Make an XML element.
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/// @param name is the name of the element, which should not be NULL.
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explicit XmlNode(const char* name);
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virtual ~XmlNode();
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/// Add a child element to this element.
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/// @param child is a xmlNode to add as a child for this element. Ownership
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/// of the child node is transferred.
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/// @return true on success, false otherwise.
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bool AddChild(scoped_xml_ptr<xmlNode> child);
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/// Adds Elements to this node using the Element struct.
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bool AddElements(const std::vector<Element>& elements);
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/// Set a string attribute.
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/// @param attribute_name The name (lhs) of the attribute.
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/// @param attribute The value (rhs) of the attribute.
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void SetStringAttribute(const char* attribute_name,
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const std::string& attribute);
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/// Sets an integer attribute.
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/// @param attribute_name The name (lhs) of the attribute.
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/// @param number The value (rhs) of the attribute.
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void SetIntegerAttribute(const char* attribute_name, uint64_t number);
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/// Set a floating point number attribute.
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/// @param attribute_name is the name of the attribute to set.
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/// @param number is the value (rhs) of the attribute.
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void SetFloatingPointAttribute(const char* attribute_name, double number);
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/// Sets 'id=@a id' attribute.
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/// @param id is the ID for this element.
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void SetId(uint32_t id);
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/// Sets 'id=rep_id' attribute.
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/// @param id is the ID for this element.
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void SetIdString(std::string id);
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/// Set the contents of an XML element using a string.
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/// This cannot set child elements because <> will become < and &rt;
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/// This should be used to set the text for the element, e.g. setting
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/// a URL for <BaseURL> element.
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/// @param content is a string containing the text-encoded child elements to
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/// be added to the element.
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void SetContent(const std::string& content);
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/// @return namespaces used in the node and its descendents.
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std::set<std::string> ExtractReferencedNamespaces();
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/// Transfer the ownership of the xmlNodePtr. After calling this method, the
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/// behavior of any methods, except the destructor, is undefined.
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/// @return The resource of this object.
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scoped_xml_ptr<xmlNode> PassScopedPtr();
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/// Release the xmlNodePtr of this object. After calling this method, the
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/// behavior of any methods, except the destructor, is undefined.
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xmlNodePtr Release();
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/// @return Raw pointer to the element.
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xmlNodePtr GetRawPtr();
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private:
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scoped_xml_ptr<xmlNode> node_;
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DISALLOW_COPY_AND_ASSIGN(XmlNode);
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};
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/// This corresponds to RepresentationBaseType in MPD. RepresentationBaseType is
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/// not a concrete element type so this should not get instantiated on its own.
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/// AdaptationSet and Representation are subtypes of this.
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class RepresentationBaseXmlNode : public XmlNode {
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public:
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~RepresentationBaseXmlNode() override;
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bool AddContentProtectionElements(
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const std::list<ContentProtectionElement>& content_protection_elements);
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/// @param scheme_id_uri is content of the schemeIdUri attribute.
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/// @param value is the content of value attribute.
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void AddSupplementalProperty(const std::string& scheme_id_uri,
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const std::string& value);
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/// @param scheme_id_uri is content of the schemeIdUri attribute.
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/// @param value is the content of value attribute.
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void AddEssentialProperty(const std::string& scheme_id_uri,
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const std::string& value);
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protected:
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explicit RepresentationBaseXmlNode(const char* name);
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/// Add a Descriptor.
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/// @param descriptor_name is the name of the descriptor.
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/// @param scheme_id_uri is content of the schemeIdUri attribute.
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/// @param value is the content of value attribute.
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bool AddDescriptor(const std::string& descriptor_name,
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const std::string& scheme_id_uri,
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const std::string& value);
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private:
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bool AddContentProtectionElement(
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const ContentProtectionElement& content_protection_element);
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DISALLOW_COPY_AND_ASSIGN(RepresentationBaseXmlNode);
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};
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/// AdaptationSetType specified in MPD.
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class AdaptationSetXmlNode : public RepresentationBaseXmlNode {
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public:
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AdaptationSetXmlNode();
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~AdaptationSetXmlNode() override;
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/// @param scheme_id_uri is content of the schemeIdUri attribute.
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/// @param value is the content of value attribute.
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void AddAccessibilityElement(const std::string& scheme_id_uri,
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const std::string& value);
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/// @param scheme_id_uri is content of the schemeIdUri attribute.
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/// @param value is the content of value attribute.
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void AddRoleElement(const std::string& scheme_id_uri,
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const std::string& value);
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private:
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DISALLOW_COPY_AND_ASSIGN(AdaptationSetXmlNode);
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};
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/// RepresentationType in MPD.
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class RepresentationXmlNode : public RepresentationBaseXmlNode {
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public:
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RepresentationXmlNode();
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~RepresentationXmlNode() override;
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/// Adds video metadata to the MPD.
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/// @param video_info constains the VideoInfo for a Representation.
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/// @param set_width is a flag for setting the width attribute.
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/// @param set_height is a flag for setting the height attribute.
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/// @param set_frame_rate is a flag for setting the frameRate attribute.
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/// @return true if successfully set attributes and children elements (if
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/// applicable), false otherwise.
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bool AddVideoInfo(const MediaInfo::VideoInfo& video_info,
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bool set_width,
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bool set_height,
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bool set_frame_rate);
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/// Adds audio metadata to the MPD.
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/// @param audio_info constains the AudioInfos for a Representation.
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/// @return true if successfully set attributes and children elements (if
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/// applicable), false otherwise.
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bool AddAudioInfo(const MediaInfo::AudioInfo& audio_info);
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/// Adds fields that are specific to VOD. This ignores @a media_info fields
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/// for Live.
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/// @param media_info is a MediaInfo with VOD information.
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/// @return true on success, false otherwise.
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bool AddVODOnlyInfo(const MediaInfo& media_info);
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/// @param segment_infos is a set of SegmentInfos. This method assumes that
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/// SegmentInfos are sorted by its start time.
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bool AddLiveOnlyInfo(const MediaInfo& media_info,
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const std::list<SegmentInfo>& segment_infos,
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uint32_t start_number);
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/// @param segment_infos is a set of SegmentInfos. This method assumes that
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/// SegmentInfos are sorted by its start time.
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/// @return SegmentTemplate node.
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scoped_xml_ptr<xmlNode> GetLiveOnlyInfo(
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const MediaInfo& media_info,
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const std::list<SegmentInfo>& segment_infos,
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uint32_t start_number);
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private:
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// Add AudioChannelConfiguration element. Note that it is a required element
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// for audio Representations.
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bool AddAudioChannelInfo(const MediaInfo::AudioInfo& audio_info);
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// Add audioSamplingRate attribute to this element, if present.
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void AddAudioSamplingRateInfo(const MediaInfo::AudioInfo& audio_info);
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DISALLOW_COPY_AND_ASSIGN(RepresentationXmlNode);
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};
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} // namespace xml
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} // namespace shaka
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#endif // MPD_BASE_XML_XML_NODE_H_
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