134 lines
4.7 KiB
C++
134 lines
4.7 KiB
C++
// Copyright 2014 Google Inc. All rights reserved.
|
|
//
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file or at
|
|
// https://developers.google.com/open-source/licenses/bsd
|
|
//
|
|
/// All the methods that are virtual are virtual for mocking.
|
|
/// NOTE: Inclusion of this module will cause xmlInitParser and xmlCleanupParser
|
|
/// to be called at static initialization / deinitialization time.
|
|
|
|
#ifndef MPD_BASE_MPD_BUILDER_H_
|
|
#define MPD_BASE_MPD_BUILDER_H_
|
|
|
|
#include <libxml/tree.h>
|
|
|
|
#include <list>
|
|
#include <memory>
|
|
#include <string>
|
|
|
|
#include "packager/base/compiler_specific.h"
|
|
#include "packager/base/optional.h"
|
|
#include "packager/base/time/clock.h"
|
|
#include "packager/mpd/base/mpd_options.h"
|
|
#include "packager/mpd/base/xml/xml_node.h"
|
|
|
|
// TODO(rkuroiwa): For classes with |id_|, consider removing the field and let
|
|
// the MPD (XML) generation functions take care of assigning an ID to each
|
|
// element.
|
|
namespace shaka {
|
|
|
|
class AdaptationSet;
|
|
class MediaInfo;
|
|
class Period;
|
|
|
|
/// This class generates DASH MPDs (Media Presentation Descriptions).
|
|
class MpdBuilder {
|
|
public:
|
|
/// Constructs MpdBuilder.
|
|
/// @param mpd_options contains options on how this MPD should be built.
|
|
explicit MpdBuilder(const MpdOptions& mpd_options);
|
|
virtual ~MpdBuilder();
|
|
|
|
/// Add <BaseURL> entry to the MPD.
|
|
/// @param base_url URL for <BaseURL> entry.
|
|
void AddBaseUrl(const std::string& base_url);
|
|
|
|
/// Check the existing Periods, if there is one matching the provided
|
|
/// @a start_time_in_seconds, return it; otherwise a new Period is created and
|
|
/// returned.
|
|
/// @param start_time_in_seconds is the period start time.
|
|
/// @return the Period matching @a start_time_in_seconds if found; otherwise
|
|
/// return a new Period.
|
|
virtual Period* GetOrCreatePeriod(double start_time_in_seconds);
|
|
|
|
/// Writes the MPD to the given string.
|
|
/// @param[out] output is an output string where the MPD gets written.
|
|
/// @return true on success, false otherwise.
|
|
// TODO(kqyang): Handle file IO in this class as in HLS media_playlist?
|
|
virtual bool ToString(std::string* output) WARN_UNUSED_RESULT;
|
|
|
|
/// Adjusts the fields of MediaInfo so that paths are relative to the
|
|
/// specified MPD path.
|
|
/// @param mpd_path is the file path of the MPD file.
|
|
/// @param media_info is the MediaInfo object to be updated with relative
|
|
/// paths.
|
|
static void MakePathsRelativeToMpd(const std::string& mpd_path,
|
|
MediaInfo* media_info);
|
|
|
|
// Inject a |clock| that returns the current time.
|
|
/// This is for testing.
|
|
void InjectClockForTesting(std::unique_ptr<base::Clock> clock) {
|
|
clock_ = std::move(clock);
|
|
}
|
|
|
|
private:
|
|
MpdBuilder(const MpdBuilder&) = delete;
|
|
MpdBuilder& operator=(const MpdBuilder&) = delete;
|
|
|
|
// LiveMpdBuilderTest needs to set availabilityStartTime so that the test
|
|
// doesn't need to depend on current time.
|
|
friend class LiveMpdBuilderTest;
|
|
template <DashProfile profile>
|
|
friend class MpdBuilderTest;
|
|
|
|
// Returns the document pointer to the MPD. This must be freed by the caller
|
|
// using appropriate xmlDocPtr freeing function.
|
|
// On failure, this returns NULL.
|
|
base::Optional<xml::XmlNode> GenerateMpd();
|
|
|
|
// Set MPD attributes common to all profiles. Uses non-zero |mpd_options_| to
|
|
// set attributes for the MPD.
|
|
bool AddCommonMpdInfo(xml::XmlNode* mpd_node) WARN_UNUSED_RESULT;
|
|
|
|
// Adds 'static' MPD attributes and elements to |mpd_node|. This assumes that
|
|
// the first child element is a Period element.
|
|
bool AddStaticMpdInfo(xml::XmlNode* mpd_node) WARN_UNUSED_RESULT;
|
|
|
|
// Same as AddStaticMpdInfo() but for 'dynamic' MPDs.
|
|
bool AddDynamicMpdInfo(xml::XmlNode* mpd_node) WARN_UNUSED_RESULT;
|
|
|
|
// Add UTCTiming element if utc timing is provided.
|
|
bool AddUtcTiming(xml::XmlNode* mpd_node) WARN_UNUSED_RESULT;
|
|
|
|
float GetStaticMpdDuration();
|
|
|
|
// Set MPD attributes for dynamic profile MPD. Uses non-zero |mpd_options_| as
|
|
// well as various calculations to set attributes for the MPD.
|
|
void SetDynamicMpdAttributes(xml::XmlNode* mpd_node);
|
|
|
|
// Gets the earliest, normalized segment timestamp. Returns true if
|
|
// successful, false otherwise.
|
|
bool GetEarliestTimestamp(double* timestamp_seconds) WARN_UNUSED_RESULT;
|
|
|
|
// Update Period durations and presentation timestamps.
|
|
void UpdatePeriodDurationAndPresentationTimestamp();
|
|
|
|
MpdOptions mpd_options_;
|
|
std::list<std::unique_ptr<Period>> periods_;
|
|
|
|
std::list<std::string> base_urls_;
|
|
std::string availability_start_time_;
|
|
|
|
uint32_t period_counter_ = 0;
|
|
uint32_t representation_counter_ = 0;
|
|
|
|
// By default, this returns the current time. This can be injected for
|
|
// testing.
|
|
std::unique_ptr<base::Clock> clock_;
|
|
};
|
|
|
|
} // namespace shaka
|
|
|
|
#endif // MPD_BASE_MPD_BUILDER_H_
|