Opus Example

Source code path: example/multimedia/audio/opus

Supported Platforms

eh-lb525

Overview

This example demonstrates how to use the Opus audio codec library for recording, encoding, decoding, and playback, including:

Record PCM audio data at a 16kHz sampling rate from the microphone via mic recording
Encoding: Compress PCM data using the Opus codec (10ms frame length, approximately 16kbps bitrate)
Decoding: Decompress audio data using the Opus decoder
Playback: Play the decoded audio data through the speakers

Example Usage

Hardware Requirements

Before running this example, prepare:

A development board supported by this example (Supported Platforms).
Speaker.

menuconfig Configuration

This example needs to read and write files, so it needs to use a file system. Configure the FAT file system:

Tip

Mount root partition in mnt_init.
Enable AUDIO CODEC and AUDIO PROC:
Enable AUDIO(AUDIO):
Enable AUDIO MANAGER.(AUDIO_USING_MANAGER)

Routine Description

If the opus_test() function contains opus_encoder_ctl(encoder, OPUS_SET_FORCE_MODE(MODE_SILK_ONLY));then define OPUS_STACK_SIZE as 20k.

If the opus_test() function does not call opus_encoder_ctl(encoder, OPUS_SET_FORCE_MODE(MODE_SILK_ONLY));, then define `OPUS_STACK_SIZE` as 200k.

Compilation and Programming

Switch to the example project directory and run the scons command to execute compilation:

scons –board=eh-lb525 -j32

Switch to the example project/build_xx directory and run uart_download.bat, select the port as prompted for download:

./uart_download.bat

Uart Download

please input the serial port num:5

For detailed steps on compilation and download, please refer to Quick Start.

Expected Results of Example

After the example starts: Start recording for ten seconds, then automatically play back after recording is complete. Expected successful recording and automatic playback.

Exception Diagnosis

Reference Documents

Update History

Version	Date	Release Notes
0.0.1	10/2024	Initial version