| // Copyright (c) 2016 The WebM project authors. All Rights Reserved. |
| // |
| // Use of this source code is governed by a BSD-style license |
| // that can be found in the LICENSE file in the root of the source |
| // tree. An additional intellectual property rights grant can be found |
| // in the file PATENTS. All contributing project authors may |
| // be found in the AUTHORS file in the root of the source tree. |
| #include "webm/callback.h" |
| |
| #include <cassert> |
| |
| namespace webm { |
| |
| Status Callback::OnElementBegin(const ElementMetadata& /* metadata */, |
| Action* action) { |
| assert(action != nullptr); |
| *action = Action::kRead; |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::OnUnknownElement(const ElementMetadata& /* metadata */, |
| Reader* reader, |
| std::uint64_t* bytes_remaining) { |
| assert(reader != nullptr); |
| assert(bytes_remaining != nullptr); |
| return Skip(reader, bytes_remaining); |
| } |
| |
| Status Callback::OnEbml(const ElementMetadata& /* metadata */, |
| const Ebml& /* ebml */) { |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::OnVoid(const ElementMetadata& /* metadata */, Reader* reader, |
| std::uint64_t* bytes_remaining) { |
| assert(reader != nullptr); |
| assert(bytes_remaining != nullptr); |
| return Skip(reader, bytes_remaining); |
| } |
| |
| Status Callback::OnSegmentBegin(const ElementMetadata& /* metadata */, |
| Action* action) { |
| assert(action != nullptr); |
| *action = Action::kRead; |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::OnSeek(const ElementMetadata& /* metadata */, |
| const Seek& /* seek */) { |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::OnInfo(const ElementMetadata& /* metadata */, |
| const Info& /* info */) { |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::OnClusterBegin(const ElementMetadata& /* metadata */, |
| const Cluster& /* cluster */, Action* action) { |
| assert(action != nullptr); |
| *action = Action::kRead; |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::OnSimpleBlockBegin(const ElementMetadata& /* metadata */, |
| const SimpleBlock& /* simple_block */, |
| Action* action) { |
| assert(action != nullptr); |
| *action = Action::kRead; |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::OnSimpleBlockEnd(const ElementMetadata& /* metadata */, |
| const SimpleBlock& /* simple_block */) { |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::OnBlockGroupBegin(const ElementMetadata& /* metadata */, |
| Action* action) { |
| assert(action != nullptr); |
| *action = Action::kRead; |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::OnBlockBegin(const ElementMetadata& /* metadata */, |
| const Block& /* block */, Action* action) { |
| assert(action != nullptr); |
| *action = Action::kRead; |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::OnBlockEnd(const ElementMetadata& /* metadata */, |
| const Block& /* block */) { |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::OnBlockGroupEnd(const ElementMetadata& /* metadata */, |
| const BlockGroup& /* block_group */) { |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::OnFrame(const FrameMetadata& /* metadata */, Reader* reader, |
| std::uint64_t* bytes_remaining) { |
| assert(reader != nullptr); |
| assert(bytes_remaining != nullptr); |
| return Skip(reader, bytes_remaining); |
| } |
| |
| Status Callback::OnClusterEnd(const ElementMetadata& /* metadata */, |
| const Cluster& /* cluster */) { |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::OnTrackEntry(const ElementMetadata& /* metadata */, |
| const TrackEntry& /* track_entry */) { |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::OnCuePoint(const ElementMetadata& /* metadata */, |
| const CuePoint& /* cue_point */) { |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::OnEditionEntry(const ElementMetadata& /* metadata */, |
| const EditionEntry& /* edition_entry */) { |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::OnTag(const ElementMetadata& /* metadata */, |
| const Tag& /* tag */) { |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::OnSegmentEnd(const ElementMetadata& /* metadata */) { |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status Callback::Skip(Reader* reader, std::uint64_t* bytes_remaining) { |
| assert(reader != nullptr); |
| assert(bytes_remaining != nullptr); |
| |
| if (*bytes_remaining == 0) |
| return Status(Status::kOkCompleted); |
| |
| Status status; |
| do { |
| std::uint64_t num_actually_skipped; |
| status = reader->Skip(*bytes_remaining, &num_actually_skipped); |
| *bytes_remaining -= num_actually_skipped; |
| } while (status.code == Status::kOkPartial); |
| |
| return status; |
| } |
| |
| } // namespace webm |