Many people has ever suspect on pulseaudio software mixing. If you have hardware mixing why using software mixing. Lennart argue that "hardware mixing is a thing of the past, modern soundcards don't do it anymore", and modern CPU with necessary SIMD commands is the trend to solve mixing performance issue. Now I'd like to discuss the mixing issue in DSP area. I have the background of working with TI OMAP 3430, which is a high level handset device platform. On this platform, TI provide a DASF (DSP Audio System Framework) solution. DASF support multiple stream encoder/decoder, resample, mixing and volume control for each stream. All these work can be done with DSP core. TI OMAP3430 has two core: one is general ARM core, the other is DSP core. Recently, I am considering to port pulseaudio to TI OMAP 3430. However, pulseaudio framework does not take DSP solution into consideration. It is trouble for me to decide mixing with DSP or pulseaudio. If with DSP, pulseaudio seems nonsense. If with pulseaudio, the DSP potential can not be fully used, and there will be performance issue. Does any one encounter the same situation as me? Any suggestion or idea is welcome! tiege
