230 lines
8.7 KiB
C++
230 lines
8.7 KiB
C++
// Copyright 2017 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
|
|
|
|
#include "packager/mpd/base/period.h"
|
|
|
|
#include "packager/base/stl_util.h"
|
|
#include "packager/mpd/base/adaptation_set.h"
|
|
#include "packager/mpd/base/mpd_options.h"
|
|
#include "packager/mpd/base/mpd_utils.h"
|
|
#include "packager/mpd/base/xml/xml_node.h"
|
|
|
|
namespace shaka {
|
|
namespace {
|
|
|
|
// The easiest way to check whether two protobufs are equal, is to compare the
|
|
// serialized version.
|
|
bool ProtectedContentEq(
|
|
const MediaInfo::ProtectedContent& content_protection1,
|
|
const MediaInfo::ProtectedContent& content_protection2) {
|
|
return content_protection1.SerializeAsString() ==
|
|
content_protection2.SerializeAsString();
|
|
}
|
|
|
|
std::set<std::string> GetUUIDs(
|
|
const MediaInfo::ProtectedContent& protected_content) {
|
|
std::set<std::string> uuids;
|
|
for (const auto& entry : protected_content.content_protection_entry())
|
|
uuids.insert(entry.uuid());
|
|
return uuids;
|
|
}
|
|
|
|
} // namespace
|
|
|
|
Period::Period(uint32_t period_id,
|
|
double start_time_in_seconds,
|
|
const MpdOptions& mpd_options,
|
|
base::AtomicSequenceNumber* adaptation_set_counter,
|
|
base::AtomicSequenceNumber* representation_counter)
|
|
: id_(period_id),
|
|
start_time_in_seconds_(start_time_in_seconds),
|
|
mpd_options_(mpd_options),
|
|
adaptation_set_counter_(adaptation_set_counter),
|
|
representation_counter_(representation_counter) {}
|
|
|
|
AdaptationSet* Period::GetOrCreateAdaptationSet(
|
|
const MediaInfo& media_info,
|
|
bool content_protection_in_adaptation_set) {
|
|
// AdaptationSets with the same key should only differ in ContentProtection,
|
|
// which also means that if |content_protection_in_adaptation_set| is false,
|
|
// there should be at most one entry in |adaptation_sets|.
|
|
const std::string key = GetAdaptationSetKey(media_info);
|
|
std::list<AdaptationSet*>& adaptation_sets = adaptation_set_list_map_[key];
|
|
if (content_protection_in_adaptation_set) {
|
|
for (AdaptationSet* adaptation_set : adaptation_sets) {
|
|
if (protected_adaptation_set_map_.Match(*adaptation_set, media_info))
|
|
return adaptation_set;
|
|
}
|
|
} else {
|
|
if (!adaptation_sets.empty()) {
|
|
DCHECK_EQ(adaptation_sets.size(), 1u);
|
|
return adaptation_sets.front();
|
|
}
|
|
}
|
|
// None of the adaptation sets match with the new content protection.
|
|
// Need a new one.
|
|
std::string language = GetLanguage(media_info);
|
|
std::unique_ptr<AdaptationSet> new_adaptation_set =
|
|
NewAdaptationSet(adaptation_set_counter_->GetNext(), language,
|
|
mpd_options_, representation_counter_);
|
|
if (!SetNewAdaptationSetAttributes(language, media_info, adaptation_sets,
|
|
new_adaptation_set.get())) {
|
|
return nullptr;
|
|
}
|
|
|
|
if (content_protection_in_adaptation_set &&
|
|
media_info.has_protected_content()) {
|
|
protected_adaptation_set_map_.Register(*new_adaptation_set, media_info);
|
|
AddContentProtectionElements(media_info, new_adaptation_set.get());
|
|
|
|
for (AdaptationSet* adaptation_set : adaptation_sets) {
|
|
if (protected_adaptation_set_map_.Switchable(*adaptation_set,
|
|
*new_adaptation_set)) {
|
|
adaptation_set->AddAdaptationSetSwitching(new_adaptation_set->id());
|
|
new_adaptation_set->AddAdaptationSetSwitching(adaptation_set->id());
|
|
}
|
|
}
|
|
}
|
|
adaptation_sets.push_back(new_adaptation_set.get());
|
|
adaptation_sets_.push_back(std::move(new_adaptation_set));
|
|
return adaptation_sets_.back().get();
|
|
}
|
|
|
|
xml::scoped_xml_ptr<xmlNode> Period::GetXml() {
|
|
xml::XmlNode period("Period");
|
|
|
|
// Required for 'dynamic' MPDs.
|
|
period.SetId(id_);
|
|
// Iterate thru AdaptationSets and add them to one big Period element.
|
|
for (const auto& adaptation_set : adaptation_sets_) {
|
|
xml::scoped_xml_ptr<xmlNode> child(adaptation_set->GetXml());
|
|
if (!child || !period.AddChild(std::move(child)))
|
|
return nullptr;
|
|
}
|
|
|
|
if (mpd_options_.mpd_type == MpdType::kDynamic ||
|
|
start_time_in_seconds_ != 0) {
|
|
period.SetStringAttribute("start",
|
|
SecondsToXmlDuration(start_time_in_seconds_));
|
|
}
|
|
return period.PassScopedPtr();
|
|
}
|
|
|
|
const std::list<AdaptationSet*> Period::GetAdaptationSets() const {
|
|
std::list<AdaptationSet*> adaptation_sets;
|
|
for (const std::unique_ptr<AdaptationSet>& adaptation_set :
|
|
adaptation_sets_) {
|
|
adaptation_sets.push_back(adaptation_set.get());
|
|
}
|
|
return adaptation_sets;
|
|
}
|
|
|
|
std::unique_ptr<AdaptationSet> Period::NewAdaptationSet(
|
|
uint32_t adaptation_set_id,
|
|
const std::string& language,
|
|
const MpdOptions& options,
|
|
base::AtomicSequenceNumber* representation_counter) {
|
|
return std::unique_ptr<AdaptationSet>(new AdaptationSet(
|
|
adaptation_set_id, language, options, representation_counter));
|
|
}
|
|
|
|
bool Period::SetNewAdaptationSetAttributes(
|
|
const std::string& language,
|
|
const MediaInfo& media_info,
|
|
const std::list<AdaptationSet*>& adaptation_sets,
|
|
AdaptationSet* new_adaptation_set) {
|
|
if (!language.empty() && language == mpd_options_.mpd_params.default_language)
|
|
new_adaptation_set->AddRole(AdaptationSet::kRoleMain);
|
|
|
|
if (media_info.has_video_info()) {
|
|
// Because 'language' is ignored for videos, |adaptation_sets| must have
|
|
// all the video AdaptationSets.
|
|
if (adaptation_sets.size() > 1) {
|
|
new_adaptation_set->AddRole(AdaptationSet::kRoleMain);
|
|
} else if (adaptation_sets.size() == 1) {
|
|
(*adaptation_sets.begin())->AddRole(AdaptationSet::kRoleMain);
|
|
new_adaptation_set->AddRole(AdaptationSet::kRoleMain);
|
|
}
|
|
|
|
if (media_info.video_info().has_playback_rate()) {
|
|
uint32_t trick_play_reference_id = 0;
|
|
if (!FindOriginalAdaptationSetForTrickPlay(media_info,
|
|
&trick_play_reference_id)) {
|
|
LOG(ERROR) << "Failed to find main adaptation set for trick play.";
|
|
return false;
|
|
}
|
|
DCHECK_NE(new_adaptation_set->id(), trick_play_reference_id);
|
|
new_adaptation_set->AddTrickPlayReferenceId(trick_play_reference_id);
|
|
}
|
|
} else if (media_info.has_text_info()) {
|
|
// IOP requires all AdaptationSets to have (sub)segmentAlignment set to
|
|
// true, so carelessly set it to true.
|
|
// In practice it doesn't really make sense to adapt between text tracks.
|
|
new_adaptation_set->ForceSetSegmentAlignment(true);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool Period::FindOriginalAdaptationSetForTrickPlay(
|
|
const MediaInfo& media_info,
|
|
uint32_t* main_adaptation_set_id) {
|
|
MediaInfo media_info_no_trickplay = media_info;
|
|
media_info_no_trickplay.mutable_video_info()->clear_playback_rate();
|
|
|
|
std::string key = GetAdaptationSetKey(media_info_no_trickplay);
|
|
const std::list<AdaptationSet*>& adaptation_sets =
|
|
adaptation_set_list_map_[key];
|
|
for (AdaptationSet* adaptation_set : adaptation_sets) {
|
|
if (protected_adaptation_set_map_.Match(*adaptation_set, media_info)) {
|
|
*main_adaptation_set_id = adaptation_set->id();
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void Period::ProtectedAdaptationSetMap::Register(
|
|
const AdaptationSet& adaptation_set,
|
|
const MediaInfo& media_info) {
|
|
DCHECK(!ContainsKey(protected_content_map_, adaptation_set.id()));
|
|
protected_content_map_[adaptation_set.id()] = media_info.protected_content();
|
|
}
|
|
|
|
bool Period::ProtectedAdaptationSetMap::Match(
|
|
const AdaptationSet& adaptation_set,
|
|
const MediaInfo& media_info) {
|
|
const auto protected_content_it =
|
|
protected_content_map_.find(adaptation_set.id());
|
|
// If the AdaptationSet ID is not registered in the map, then it is clear
|
|
// content.
|
|
if (protected_content_it == protected_content_map_.end())
|
|
return !media_info.has_protected_content();
|
|
if (!media_info.has_protected_content())
|
|
return false;
|
|
return ProtectedContentEq(protected_content_it->second,
|
|
media_info.protected_content());
|
|
}
|
|
|
|
bool Period::ProtectedAdaptationSetMap::Switchable(
|
|
const AdaptationSet& adaptation_set_a,
|
|
const AdaptationSet& adaptation_set_b) {
|
|
const auto protected_content_it_a =
|
|
protected_content_map_.find(adaptation_set_a.id());
|
|
const auto protected_content_it_b =
|
|
protected_content_map_.find(adaptation_set_b.id());
|
|
|
|
if (protected_content_it_a == protected_content_map_.end())
|
|
return protected_content_it_b == protected_content_map_.end();
|
|
if (protected_content_it_b == protected_content_map_.end())
|
|
return false;
|
|
// Get all the UUIDs of the AdaptationSet. If another AdaptationSet has the
|
|
// same UUIDs then those are switchable.
|
|
return GetUUIDs(protected_content_it_a->second) ==
|
|
GetUUIDs(protected_content_it_b->second);
|
|
}
|
|
|
|
} // namespace shaka
|