>> The next stream type should be a pulse audio internal type(s) used for >> the mixing of mp3/ac3 and perhaps dts streams. ?It's my understanding >> that ac3 uses vectors to describe 6 channels of sound much like a 2ch >> mp3. ?If I'm not mistaken these vectors can be combined mathematically >> as-is to represent the combination of two sounds. ?This would be a great >> achivement over any uncompress/combine/recompress senerio. > > Do you have any pointers to how this is done? If it's true that there > really is a way to mix compressed streams without uncompressing first, > then maybe volume adjustment is possible too? Nah. no way you can mix streams without decompressing (dequantization+inverse transform). The only thing you could do is mix in the transform domain if both streams used the same transform and window size, not a very common case. -Pierre
