Implement Functions for Converting Audio Files to .caf Format and Vice Versa

[NewtTheWolf]

Description:

Implement functions within the sendblue library to handle the conversion of various audio file formats to .caf (Core Audio Format) and from .caf to other audio file formats. This will allow users to easily integrate audio file conversion capabilities into their applications, making it easier to work with audio data in the desired formats. The functions should support both file paths and binary data for input and output.

Acceptance Criteria:

• Implement a function to convert audio files of common formats (e.g., MP3, WAV, AAC) to .caf format.
• Implement a function to convert .caf files to other common audio formats (e.g., MP3, WAV, AAC).
• Ensure the conversion functions handle different audio encoding settings (e.g., sample rate, bit rate).
• Provide error handling for unsupported formats and conversion failures.
• Support both file paths and binary data for input and output.
• Update documentation and examples to reflect the new conversion functions.
• Add comprehensive tests to ensure the conversion functions work as expected.
• Ensure the functions are optimized for performance and do not introduce significant latency or resource consumption.

Example Functions:

• convert_to_caf(input: AudioInput, output: AudioOutput) -> Result<(), ConversionError>
• convert_from_caf(input: AudioInput, output: AudioOutput) -> Result<(), ConversionError>

Example Usage:

Converting an MP3 file to .caf format using file paths:

use sendblue::audio::{convert_to_caf, AudioInput, AudioOutput};

fn main() {
    let input = AudioInput::Path("example.mp3".into());
    let output = AudioOutput::Path("example.caf".into());

    match convert_to_caf(input, output) {
        Ok(()) => println!("Successfully converted to .caf format."),
        Err(e) => eprintln!("Error converting to .caf: {:?}", e),
    }
}

Converting a .caf file to WAV format using binary data:

use sendblue::audio::{convert_from_caf, AudioInput, AudioOutput};

fn main() {
    let input_data = std::fs::read("example.caf").expect("Failed to read input file");
    let output = AudioOutput::Path("example.wav".into());

    match convert_from_caf(AudioInput::Data(input_data), output) {
        Ok(()) => println!("Successfully converted from .caf format."),
        Err(e) => eprintln!("Error converting from .caf: {:?}", e),
    }
}

These functions will take either the path to the input audio file or binary data and the desired output path or binary data, performing the necessary conversion and saving the result to the specified location or returning the binary data.