语音编码，单声道加数字水印，测试音质变化，循环写入，测试实时性-Speech coding, digital watermarking increases mono test tone changes, write cycle, testing real-time

OMAPL138板子中dmai例程中的speech编码例程修改,由于Ti提供的原始代码根本无法正常工作,进行修改后可以进行G711音频正常编码.-OMAPL138 board dmai routine speech coding routine modified Ti provide the original code did not work, modified G711 audio coding.