G711A encoder and decoder demo

[中文]

1、Function overview

Perform G711A codec on the specified xx.pcm audio file, and output the codec processed audio to the xx.pcm file

2、Code path

demo path: \components\demos\media\audio\g711

For the detailed description of the API interface of G711A library, please refer to the same webpage: /api-reference/multi_media/bk_aec.html

3、Cli command introduction

The commands supported by the demo are as follows:

Command

Description

g711_encoder_test

run G711 encoder test demo

g711_decoder_test

run G711 decoder test demo

The macro configuration that the demo runs depends on:

Name

Description

File

value

CONFIG_AUDIO_G711

Configure whether G711 is compiled as a library

\properties\soc\bk7256\bk7256.defconfig

y

CONFIG_AUDIO_G711_TEST

Configure demo enable

\middleware\soc\bk7256\bk7256.defconfig

y
Demo runs dependent libraries and drivers:

  • libg711.a G711 library

  • SD SDcard driver

4、Demo introduction

The steps performed by the demo are as follows:

1.Prepare the audio files needed for the test

  • Save the audio file mic_data.pcm for encoding test and encoder_mic_data.pcm for decoding test provided in the demo path in the root directory of the TF card

2.Mount TF card

  • Uart sends AT command fatfstest M 1 to mount TF card

3.Perform coding tests

  • Uart sends the AT command g711_encoder_test to execute the test and output the encoded audio file out_encoder_data.pcm to the root directory of the TF card

4.Perform a decoding test

  • Uart sends the AT command g711_decoder_test to execute the test, and output the decoded audio file out_decoder_data.pcm to the root directory of the TF card

5、Detailed configuration and description

Important

Precautions:

  • 1.G711 codec library also supports G711U codec, the test demo demonstrates G711A codec;

  • 2.The audio signal encoded and decoded by G711 is mono 16bit.