[debug] fix badcase, add fade on speech output #379
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我是柏基
cosyvoice的流式推理存在badcase，会导致音频听起来有颤音/不连贯，经过定位发现两个问题
1、（fixed）hifigan的speech输出，在chunk开头部分会有瑕疵，本PR解决
解决策略：在speech输出加入smooth（同fade in out方法）后显著改善音质
2、（ongoing）flow的token context没有处理好，导致mel谱上下文跳变，处理中