376 lines
14 KiB
C++
376 lines
14 KiB
C++
// Copyright 2017 Google LLC. 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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#include "packager/mpd/base/period.h"
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#include "packager/base/stl_util.h"
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#include "packager/mpd/base/adaptation_set.h"
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#include "packager/mpd/base/mpd_options.h"
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#include "packager/mpd/base/mpd_utils.h"
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#include "packager/mpd/base/xml/xml_node.h"
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namespace shaka {
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namespace {
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// The easiest way to check whether two protobufs are equal, is to compare the
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// serialized version.
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bool ProtectedContentEq(
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const MediaInfo::ProtectedContent& content_protection1,
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const MediaInfo::ProtectedContent& content_protection2) {
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return content_protection1.SerializeAsString() ==
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content_protection2.SerializeAsString();
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}
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std::set<std::string> GetUUIDs(
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const MediaInfo::ProtectedContent& protected_content) {
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std::set<std::string> uuids;
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for (const auto& entry : protected_content.content_protection_entry())
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uuids.insert(entry.uuid());
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return uuids;
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}
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const std::string& GetDefaultAudioLanguage(const MpdOptions& mpd_options) {
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return mpd_options.mpd_params.default_language;
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}
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const std::string& GetDefaultTextLanguage(const MpdOptions& mpd_options) {
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return mpd_options.mpd_params.default_text_language.empty()
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? mpd_options.mpd_params.default_language
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: mpd_options.mpd_params.default_text_language;
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}
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AdaptationSet::Role RoleFromString(const std::string& role_str) {
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if (role_str == "caption")
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return AdaptationSet::Role::kRoleCaption;
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if (role_str == "subtitle")
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return AdaptationSet::Role::kRoleSubtitle;
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if (role_str == "main")
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return AdaptationSet::Role::kRoleMain;
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if (role_str == "alternate")
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return AdaptationSet::Role::kRoleAlternate;
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if (role_str == "supplementary")
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return AdaptationSet::Role::kRoleSupplementary;
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if (role_str == "commentary")
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return AdaptationSet::Role::kRoleCommentary;
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if (role_str == "dub")
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return AdaptationSet::Role::kRoleDub;
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if (role_str == "description")
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return AdaptationSet::Role::kRoleDescription;
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return AdaptationSet::Role::kRoleUnknown;
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}
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} // namespace
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Period::Period(uint32_t period_id,
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double start_time_in_seconds,
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const MpdOptions& mpd_options,
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uint32_t* representation_counter)
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: id_(period_id),
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start_time_in_seconds_(start_time_in_seconds),
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mpd_options_(mpd_options),
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representation_counter_(representation_counter) {}
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AdaptationSet* Period::GetOrCreateAdaptationSet(
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const MediaInfo& media_info,
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bool content_protection_in_adaptation_set) {
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// Set duration if it is not set. It may be updated later from duration
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// calculated from segments.
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if (duration_seconds_ == 0)
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duration_seconds_ = media_info.media_duration_seconds();
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const std::string key = GetAdaptationSetKey(
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media_info, mpd_options_.mpd_params.allow_codec_switching);
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std::list<AdaptationSet*>& adaptation_sets = adaptation_set_list_map_[key];
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for (AdaptationSet* adaptation_set : adaptation_sets) {
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if (protected_adaptation_set_map_.Match(
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*adaptation_set, media_info, content_protection_in_adaptation_set))
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return adaptation_set;
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}
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// None of the adaptation sets match with the new content protection.
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// Need a new one.
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const std::string language = GetLanguage(media_info);
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std::unique_ptr<AdaptationSet> new_adaptation_set =
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NewAdaptationSet(language, mpd_options_, representation_counter_);
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if (!SetNewAdaptationSetAttributes(language, media_info, adaptation_sets,
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content_protection_in_adaptation_set,
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new_adaptation_set.get())) {
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return nullptr;
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}
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if (content_protection_in_adaptation_set &&
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media_info.has_protected_content()) {
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protected_adaptation_set_map_.Register(*new_adaptation_set, media_info);
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AddContentProtectionElements(media_info, new_adaptation_set.get());
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}
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for (AdaptationSet* adaptation_set : adaptation_sets) {
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if (protected_adaptation_set_map_.Switchable(*adaptation_set,
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*new_adaptation_set)) {
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adaptation_set->AddAdaptationSetSwitching(new_adaptation_set.get());
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new_adaptation_set->AddAdaptationSetSwitching(adaptation_set);
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}
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}
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AdaptationSet* adaptation_set_ptr = new_adaptation_set.get();
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adaptation_sets.push_back(adaptation_set_ptr);
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adaptation_sets_.emplace_back(std::move(new_adaptation_set));
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return adaptation_set_ptr;
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}
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base::Optional<xml::XmlNode> Period::GetXml(bool output_period_duration) {
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adaptation_sets_.sort(
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[](const std::unique_ptr<AdaptationSet>& adaptation_set_a,
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const std::unique_ptr<AdaptationSet>& adaptation_set_b) {
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if (!adaptation_set_a->has_id())
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return false;
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if (!adaptation_set_b->has_id())
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return true;
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return adaptation_set_a->id() < adaptation_set_b->id();
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});
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xml::XmlNode period("Period");
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// Required for 'dynamic' MPDs.
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if (!period.SetId(id_))
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return base::nullopt;
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// Required for LL-DASH MPDs.
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if (mpd_options_.mpd_params.low_latency_dash_mode) {
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// Create ServiceDescription element.
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xml::XmlNode service_description_node("ServiceDescription");
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if (!service_description_node.SetIntegerAttribute("id", id_))
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return base::nullopt;
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// Insert Latency into ServiceDescription element.
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xml::XmlNode latency_node("Latency");
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uint64_t target_latency_ms =
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mpd_options_.mpd_params.target_latency_seconds * 1000;
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if (!latency_node.SetIntegerAttribute("target", target_latency_ms))
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return base::nullopt;
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if (!service_description_node.AddChild(std::move(latency_node)))
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return base::nullopt;
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// Insert ServiceDescription into Period element.
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if (!period.AddChild(std::move(service_description_node)))
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return base::nullopt;
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}
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// Iterate thru AdaptationSets and add them to one big Period element.
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for (const auto& adaptation_set : adaptation_sets_) {
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auto child = adaptation_set->GetXml();
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if (!child || !period.AddChild(std::move(*child)))
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return base::nullopt;
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}
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if (output_period_duration) {
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if (!period.SetStringAttribute("duration",
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SecondsToXmlDuration(duration_seconds_))) {
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return base::nullopt;
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}
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} else if (mpd_options_.mpd_type == MpdType::kDynamic) {
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if (!period.SetStringAttribute(
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"start", SecondsToXmlDuration(start_time_in_seconds_))) {
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return base::nullopt;
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}
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}
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return period;
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}
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const std::list<AdaptationSet*> Period::GetAdaptationSets() const {
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std::list<AdaptationSet*> adaptation_sets;
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for (const auto& adaptation_set : adaptation_sets_) {
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adaptation_sets.push_back(adaptation_set.get());
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}
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return adaptation_sets;
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}
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std::unique_ptr<AdaptationSet> Period::NewAdaptationSet(
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const std::string& language,
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const MpdOptions& options,
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uint32_t* representation_counter) {
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return std::unique_ptr<AdaptationSet>(
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new AdaptationSet(language, options, representation_counter));
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}
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bool Period::SetNewAdaptationSetAttributes(
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const std::string& language,
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const MediaInfo& media_info,
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const std::list<AdaptationSet*>& adaptation_sets,
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bool content_protection_in_adaptation_set,
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AdaptationSet* new_adaptation_set) {
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if (!media_info.dash_roles().empty()) {
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for (const std::string& role_str : media_info.dash_roles()) {
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AdaptationSet::Role role = RoleFromString(role_str);
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if (role == AdaptationSet::kRoleUnknown) {
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LOG(ERROR) << "Unrecognized role '" << role_str << "'.";
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return false;
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}
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new_adaptation_set->AddRole(role);
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}
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} else if (!language.empty()) {
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const bool is_main_role =
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language == (media_info.has_audio_info()
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? GetDefaultAudioLanguage(mpd_options_)
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: GetDefaultTextLanguage(mpd_options_));
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if (is_main_role)
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new_adaptation_set->AddRole(AdaptationSet::kRoleMain);
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}
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for (const std::string& accessibility : media_info.dash_accessibilities()) {
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size_t pos = accessibility.find('=');
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if (pos == std::string::npos) {
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LOG(ERROR)
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<< "Accessibility should be in scheme=value format, but seeing "
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<< accessibility;
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return false;
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}
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new_adaptation_set->AddAccessibility(accessibility.substr(0, pos),
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accessibility.substr(pos + 1));
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}
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new_adaptation_set->set_codec(GetBaseCodec(media_info));
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if (media_info.has_video_info()) {
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// Because 'language' is ignored for videos, |adaptation_sets| must have
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// all the video AdaptationSets.
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if (adaptation_sets.size() > 1) {
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new_adaptation_set->AddRole(AdaptationSet::kRoleMain);
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} else if (adaptation_sets.size() == 1) {
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(*adaptation_sets.begin())->AddRole(AdaptationSet::kRoleMain);
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new_adaptation_set->AddRole(AdaptationSet::kRoleMain);
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}
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if (media_info.video_info().has_playback_rate()) {
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std::string trick_play_reference_adaptation_set_key;
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AdaptationSet* trick_play_reference_adaptation_set =
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FindMatchingAdaptationSetForTrickPlay(
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media_info, content_protection_in_adaptation_set,
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&trick_play_reference_adaptation_set_key);
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if (trick_play_reference_adaptation_set) {
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new_adaptation_set->AddTrickPlayReference(
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trick_play_reference_adaptation_set);
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} else {
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trickplay_cache_[trick_play_reference_adaptation_set_key].push_back(
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new_adaptation_set);
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}
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} else {
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std::string trick_play_adaptation_set_key;
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AdaptationSet* trickplay_adaptation_set =
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FindMatchingAdaptationSetForTrickPlay(
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media_info, content_protection_in_adaptation_set,
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&trick_play_adaptation_set_key);
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if (trickplay_adaptation_set) {
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trickplay_adaptation_set->AddTrickPlayReference(new_adaptation_set);
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trickplay_cache_.erase(trick_play_adaptation_set_key);
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}
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}
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} else if (media_info.has_text_info()) {
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// IOP requires all AdaptationSets to have (sub)segmentAlignment set to
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// true, so carelessly set it to true.
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// In practice it doesn't really make sense to adapt between text tracks.
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new_adaptation_set->ForceSetSegmentAlignment(true);
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}
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return true;
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}
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AdaptationSet* Period::FindMatchingAdaptationSetForTrickPlay(
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const MediaInfo& media_info,
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bool content_protection_in_adaptation_set,
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std::string* adaptation_set_key) {
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std::list<AdaptationSet*>* adaptation_sets = nullptr;
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const bool is_trickplay_adaptation_set =
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media_info.video_info().has_playback_rate();
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if (is_trickplay_adaptation_set) {
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*adaptation_set_key = GetAdaptationSetKeyForTrickPlay(media_info);
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if (adaptation_set_list_map_.find(*adaptation_set_key) ==
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adaptation_set_list_map_.end())
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return nullptr;
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adaptation_sets = &adaptation_set_list_map_[*adaptation_set_key];
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} else {
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*adaptation_set_key = GetAdaptationSetKey(
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media_info, mpd_options_.mpd_params.allow_codec_switching);
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if (trickplay_cache_.find(*adaptation_set_key) == trickplay_cache_.end())
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return nullptr;
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adaptation_sets = &trickplay_cache_[*adaptation_set_key];
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}
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for (AdaptationSet* adaptation_set : *adaptation_sets) {
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if (protected_adaptation_set_map_.Match(
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*adaptation_set, media_info,
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content_protection_in_adaptation_set)) {
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return adaptation_set;
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}
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}
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return nullptr;
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}
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std::string Period::GetAdaptationSetKeyForTrickPlay(
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const MediaInfo& media_info) {
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MediaInfo media_info_no_trickplay = media_info;
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media_info_no_trickplay.mutable_video_info()->clear_playback_rate();
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return GetAdaptationSetKey(media_info_no_trickplay,
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mpd_options_.mpd_params.allow_codec_switching);
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}
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void Period::ProtectedAdaptationSetMap::Register(
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const AdaptationSet& adaptation_set,
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const MediaInfo& media_info) {
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DCHECK(!ContainsKey(protected_content_map_, &adaptation_set));
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protected_content_map_[&adaptation_set] = media_info.protected_content();
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}
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bool Period::ProtectedAdaptationSetMap::Match(
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const AdaptationSet& adaptation_set,
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const MediaInfo& media_info,
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bool content_protection_in_adaptation_set) {
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if (adaptation_set.codec() != GetBaseCodec(media_info))
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return false;
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if (!content_protection_in_adaptation_set)
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return true;
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const auto protected_content_it =
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protected_content_map_.find(&adaptation_set);
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// If the AdaptationSet ID is not registered in the map, then it is clear
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// content.
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if (protected_content_it == protected_content_map_.end())
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return !media_info.has_protected_content();
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if (!media_info.has_protected_content())
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return false;
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return ProtectedContentEq(protected_content_it->second,
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media_info.protected_content());
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}
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bool Period::ProtectedAdaptationSetMap::Switchable(
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const AdaptationSet& adaptation_set_a,
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const AdaptationSet& adaptation_set_b) {
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const auto protected_content_it_a =
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protected_content_map_.find(&adaptation_set_a);
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const auto protected_content_it_b =
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protected_content_map_.find(&adaptation_set_b);
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if (protected_content_it_a == protected_content_map_.end())
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return protected_content_it_b == protected_content_map_.end();
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if (protected_content_it_b == protected_content_map_.end())
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return false;
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// Get all the UUIDs of the AdaptationSet. If another AdaptationSet has the
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// same UUIDs then those are switchable.
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return GetUUIDs(protected_content_it_a->second) ==
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GetUUIDs(protected_content_it_b->second);
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}
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Period::~Period() {
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if (!trickplay_cache_.empty()) {
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LOG(WARNING) << "Trickplay adaptation set did not get a valid adaptation "
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"set match. Please check the command line options.";
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}
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}
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} // namespace shaka
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