Initial release

2026-08-16 18:27:57 +07:00
commit 8ff9ca0fc0
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+// 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.
+#ifndef SRC_AUDIO_PARSER_H_
+#define SRC_AUDIO_PARSER_H_
+
+#include <cassert>
+#include <cstdint>
+
+#include "src/float_parser.h"
+#include "src/int_parser.h"
+#include "src/master_value_parser.h"
+#include "webm/callback.h"
+#include "webm/dom_types.h"
+#include "webm/id.h"
+#include "webm/reader.h"
+#include "webm/status.h"
+
+namespace webm {
+
+// Spec reference:
+// http://matroska.org/technical/specs/index.html#Audio
+// http://www.webmproject.org/docs/container/#Audio
+class AudioParser : public MasterValueParser<Audio> {
+ public:
+  AudioParser()
+      : MasterValueParser<Audio>(
+            MakeChild<FloatParser>(Id::kSamplingFrequency,
+                                   &Audio::sampling_frequency),
+            MakeChild<FloatParser>(Id::kOutputSamplingFrequency,
+                                   &Audio::output_frequency)
+                .NotifyOnParseComplete(),
+            MakeChild<UnsignedIntParser>(Id::kChannels, &Audio::channels),
+            MakeChild<UnsignedIntParser>(Id::kBitDepth, &Audio::bit_depth)) {}
+
+  Status Init(const ElementMetadata& metadata,
+              std::uint64_t max_size) override {
+    output_frequency_has_value_ = false;
+
+    return MasterValueParser::Init(metadata, max_size);
+  }
+
+  void InitAfterSeek(const Ancestory& child_ancestory,
+                     const ElementMetadata& child_metadata) override {
+    output_frequency_has_value_ = false;
+
+    return MasterValueParser::InitAfterSeek(child_ancestory, child_metadata);
+  }
+
+  Status Feed(Callback* callback, Reader* reader,
+              std::uint64_t* num_bytes_read) override {
+    const Status status =
+        MasterValueParser::Feed(callback, reader, num_bytes_read);
+    if (status.completed_ok()) {
+      FixMissingOutputFrequency();
+    }
+    return status;
+  }
+
+ protected:
+  void OnChildParsed(const ElementMetadata& metadata) override {
+    assert(metadata.id == Id::kOutputSamplingFrequency);
+
+    output_frequency_has_value_ = metadata.size > 0;
+  }
+
+ private:
+  bool output_frequency_has_value_;
+
+  void FixMissingOutputFrequency() {
+    if (!output_frequency_has_value_) {
+      *mutable_value()->output_frequency.mutable_value() =
+          value().sampling_frequency.value();
+    }
+  }
+};
+
+}  // namespace webm
+
+#endif  // SRC_AUDIO_PARSER_H_