85 lines
2.6 KiB
C++
85 lines
2.6 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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#ifndef SRC_AUDIO_PARSER_H_
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#define SRC_AUDIO_PARSER_H_
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#include <cassert>
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#include <cstdint>
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#include "src/float_parser.h"
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#include "src/int_parser.h"
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#include "src/master_value_parser.h"
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#include "webm/callback.h"
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#include "webm/dom_types.h"
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#include "webm/id.h"
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#include "webm/reader.h"
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#include "webm/status.h"
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namespace webm {
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// Spec reference:
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// http://matroska.org/technical/specs/index.html#Audio
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// http://www.webmproject.org/docs/container/#Audio
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class AudioParser : public MasterValueParser<Audio> {
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public:
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AudioParser()
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: MasterValueParser<Audio>(
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MakeChild<FloatParser>(Id::kSamplingFrequency,
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&Audio::sampling_frequency),
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MakeChild<FloatParser>(Id::kOutputSamplingFrequency,
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&Audio::output_frequency)
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.NotifyOnParseComplete(),
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MakeChild<UnsignedIntParser>(Id::kChannels, &Audio::channels),
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MakeChild<UnsignedIntParser>(Id::kBitDepth, &Audio::bit_depth)) {}
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Status Init(const ElementMetadata& metadata,
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std::uint64_t max_size) override {
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output_frequency_has_value_ = false;
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return MasterValueParser::Init(metadata, max_size);
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}
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void InitAfterSeek(const Ancestory& child_ancestory,
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const ElementMetadata& child_metadata) override {
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output_frequency_has_value_ = false;
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return MasterValueParser::InitAfterSeek(child_ancestory, child_metadata);
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}
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Status Feed(Callback* callback, Reader* reader,
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std::uint64_t* num_bytes_read) override {
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const Status status =
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MasterValueParser::Feed(callback, reader, num_bytes_read);
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if (status.completed_ok()) {
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FixMissingOutputFrequency();
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}
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return status;
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}
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protected:
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void OnChildParsed(const ElementMetadata& metadata) override {
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assert(metadata.id == Id::kOutputSamplingFrequency);
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output_frequency_has_value_ = metadata.size > 0;
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}
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private:
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bool output_frequency_has_value_;
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void FixMissingOutputFrequency() {
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if (!output_frequency_has_value_) {
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*mutable_value()->output_frequency.mutable_value() =
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value().sampling_frequency.value();
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}
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}
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};
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} // namespace webm
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#endif // SRC_AUDIO_PARSER_H_
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