On Thu, Nov 20, 2008 at 05:46:49PM -0800, Shane W wrote:> On Fri, Nov 21, 2008 at 09:36:55AM +0800, Wu Fengguang wrote:> > > > > supports coding type AC-3: channels = 6, rates = 44100> > > 48000 88200, max bitrate = 640000> > > supports coding type DTS: channels = 7, rates = 44100 48000> > > 88200 176400 192000, max bitrate = 1536000> > > supports coding type DSD (One Bit Audio): channels = 6,> > > rates = 48000> > > > It's weird that DTS supports 7 channels while DSD supports 6.> > DTS is simple the compressed form of DSD.> > Hmm, I thought DTS was just another way of compressing PCM> whereas DSD is the format used on SACD disks, IE 6 channel.> http://en.wikipedia.org/wiki/Direct_Stream_Digital Well my source is a bit different ;-) http://en.wikipedia.org/wiki/Super_Audio_CD DST To reduce the space and bandwidth requirements of DSD (2.8 Mbit/s perchannel), a lossless data compression method called Direct StreamTransfer (DST) is used — DST compression is compulsory formulti-channel regions and optional for stereo regions. This typicallycompresses by a factor of between two and three, allowing a disc tocontain 80 minutes of both 2-channel and 5.1-channel sound. > > > The speakers 0 line is a bit confusing, not sure if that's> > > > Yes it's unexpected. Do you know its real speaker numbers and> > allocations? Does it provide some number of line-out ports?> > There are six speakers connected, fl, ct, fr, rl, rr and> lfe. Takashi, I'd suggest to support writing to the ELD proc interface toalter the internal ELD struct. This could let users debug/fix quicksconveniently. But sure these fixes should eventually be incorporatedinto the kernel so that it just works. > > > what's doing it. I am using:> > > aplay 51test.wav> > > > > > which I have put here:> > > http://www.csy.ca/~shane/51test.wav> > > > I hear only "front left" and "front right" in my T61 :-)> > Yeah, you should get:> Front left> Center> Rear left> Rear right> and a little boom from the sub> > If you encode 51test.wav to ac3 and stream through hdmi> directly, it does this properly. OK, so 5.1 AC3 audio plays properly on HDMI? Thanks,Fengguang_______________________________________________Alsa-devel mailing listAlsa-devel@xxxxxxxxxxxxxxxxxxxx://mailman.alsa-project.org/mailman/listinfo/alsa-devel
