编码器被设置为amr_nb，这是音频格式，采样率为8 KHz。
The encoder is set to the AMR_NB, which is an audio format, sampling at 8 KHz.
op _ import：将采样数据库文件从外部格式(abi)转换为本地格式。
Op_import: Converts sample database files from the foreign format (abi) to native format.
我们选择的声音效果格式不同，其中两个是signed 16 bit Little Endian，采样率为22050 Hz，另外两个是Unsigned 8 bit，采样率为11025 Hz。
The sound effects we selected are in different formats, two being signed 16 bit Little Endian, Rate 22050 Hz and two others being Unsigned 8 bit, Rate 11025 Hz.
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