87 lines
2.7 KiB
C++
87 lines
2.7 KiB
C++
// Copyright (c) 2016 The WebM project authors. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the LICENSE file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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#include "src/segment_parser.h"
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#include "src/chapters_parser.h"
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#include "src/cluster_parser.h"
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#include "src/cues_parser.h"
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#include "src/info_parser.h"
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#include "src/seek_head_parser.h"
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#include "src/skip_callback.h"
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#include "src/tags_parser.h"
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#include "src/tracks_parser.h"
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#include "webm/id.h"
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namespace webm {
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SegmentParser::SegmentParser()
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: MasterParser(MakeChild<ChaptersParser>(Id::kChapters),
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MakeChild<ClusterParser>(Id::kCluster),
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MakeChild<CuesParser>(Id::kCues),
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MakeChild<InfoParser>(Id::kInfo),
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MakeChild<SeekHeadParser>(Id::kSeekHead),
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MakeChild<TagsParser>(Id::kTags),
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MakeChild<TracksParser>(Id::kTracks)) {}
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Status SegmentParser::Init(const ElementMetadata& metadata,
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std::uint64_t max_size) {
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assert(metadata.size == kUnknownElementSize || metadata.size <= max_size);
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begin_done_ = false;
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parse_completed_ = false;
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return MasterParser::Init(metadata, max_size);
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}
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void SegmentParser::InitAfterSeek(const Ancestory& child_ancestory,
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const ElementMetadata& child_metadata) {
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MasterParser::InitAfterSeek(child_ancestory, child_metadata);
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begin_done_ = true;
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parse_completed_ = false;
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action_ = Action::kRead;
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}
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Status SegmentParser::Feed(Callback* callback, Reader* reader,
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std::uint64_t* num_bytes_read) {
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assert(callback != nullptr);
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assert(reader != nullptr);
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assert(num_bytes_read != nullptr);
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*num_bytes_read = 0;
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if (!begin_done_) {
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const ElementMetadata metadata{Id::kSegment, header_size(), size(),
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position()};
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const Status status = callback->OnSegmentBegin(metadata, &action_);
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if (!status.completed_ok()) {
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return status;
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}
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begin_done_ = true;
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}
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SkipCallback skip_callback;
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if (action_ == Action::kSkip) {
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callback = &skip_callback;
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}
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if (!parse_completed_) {
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const Status status = MasterParser::Feed(callback, reader, num_bytes_read);
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if (!status.completed_ok()) {
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return status;
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}
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parse_completed_ = true;
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}
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return callback->OnSegmentEnd(
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{Id::kSegment, header_size(), size(), position()});
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}
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bool SegmentParser::WasSkipped() const { return action_ == Action::kSkip; }
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} // namespace webm
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