Encoding and decoding audio

At a glance

Project structure

Source bundle/
├── ACEncodeDecodeAudio/
│   ├── main.cpp
│   └── Common/
│       ├── AudioConverter.cpp
│       ├── AudioFile.cpp
│       └── AudioToolboxError.cpp
├── Common/
│   ├── AudioConverter.cpp
│   ├── AudioFile.cpp
│   └── AudioToolboxError.cpp
├── ACEncodeDecodeAudio.xcodeproj/
│   ├── .xcodesamplecode.plist
│   └── project.pbxproj
└── Configuration/
    └── SampleCode.xcconfig

Structure observations

• Architecturally prominent files are ranked from entry points and role-named declarations; resource-only paths are omitted.
• Primary languages: C++.
• The verified tree contains 3 project/configuration file(s) and 1 source declaration(s).

Overall architecture

flowchart LR
    N1["main"]
    N2["AudioToolbox APIs"]
    N1 --> N2

Reference code

ACEncodeDecodeAudio/main.cpp:81 — architecture anchor

int main(int argc, const char* argv[])
{
    // ...
}

Interpretation

The arrows summarize the source-visible entry, role-named types or folders, and framework direction; when nodes come from structural folders, the sequence is a high-level interpretation rather than proof that every adjacent node calls the next. Ownership is claimed only where the next section cites a stored property or assignment. The diagram is intentionally limited to the dominant path into Audio Toolbox.

Ownership and state

classDiagram
    main --> AudioToolboxAPIs : uses

Ownership evidence

ACEncodeDecodeAudio/Common/AudioConverter.cpp:8 — stored dependency or nearest verified ownership anchor

#include "AudioConverter.hpp"
#include "AudioToolboxError.hpp"

#include <sstream>

AudioConverter::~AudioConverter() { Dispose(); }

Composition arrows indicate a source-visible construction expression or locally owned value state; aggregation means the owner stores or receives a dependency without proving exclusive lifetime ownership.

Class and protocol design

ACEncodeDecodeAudio/main.cpp:18 — representative type boundary

class InputContext {
    // ...
};

No local protocol conformance is claimed as protocol-oriented design; external framework conformances are listed only as dependencies.

Access control

Reference code

Common/AudioConverter.cpp:8 — representative boundary

#include "AudioConverter.hpp"
#include "AudioToolboxError.hpp"

#include <sstream>

AudioConverter::~AudioConverter() { Dispose(); }

Swift declarations without a modifier are internal; explicit private, fileprivate, private(set), public, or open entries above are interpreted by language semantics. Objective-C/C samples instead rely on header and implementation boundaries, which are not equivalent to Swift lexical privacy.

Logic ownership and placement

Design patterns

Naming conventions

• Types: feature-specific names rather than reusable layer suffixes.
• Protocols: no local protocol declaration in the scanned source.
• Methods: no representative method name extracted from the architectural files.
• Files: feature/project roles rather than a strict one-type-per-file rule.

Architecture takeaways

• main is the main source-visible entry or composition anchor for this sample.
• Framework work reaches sstream, AudioToolbox, iostream, vector through a deliberately small high-level chain; the detailed API graph remains inside the cited implementation files.
• Stored-property evidence identifies lifecycle collaboration; it does not by itself prove exclusive object ownership.
• Access-control conclusions separate verified language visibility from the likely design rationale.
• The source does not justify labeling the design protocol-oriented.

Source map

• Official Apple documentation