search for: multichaud

...und the following document on the Microsoft website. It appears to be the file format counterpart to the API documentation presented by Chris Wolf. I'm not familiar with the WAVE format, so I'll let you guys interpret it (or tell me it is irrelevant): http://www.microsoft.com/HWDEV/audio/multichaud.htm [As an aside: Why does Microsoft make it so hard to find a definitive spec for the WAVE format? I searched their site in vain for something resembling a "RIFF Audio Spec, Version XXX.YYY" document. It isn't like this is new technology or anything.] --- Stan Seibert --- >8...

Hello, I created a patch for oggenc that gives it minimal support for WAV files with the WAVE_FORMAT_EXTENSIBLE format. What's the right way to submit this? http://www.microsoft.com/whdc/device/audio/multichaud.mspx Joe Holt

...ar left 4: rear right 5: LFE (source: http://www.xiph.org/vorbis/doc/Vorbis_I_spec.html#id342556 ) At the same time, the order of channels in WAV files seems to be: 0: front left 1: front right 2: front center 3: LFE 4: rear left 5: rear right (source: http://www.microsoft.com/whdc/device/audio/multichaud.mspx#E4C ) Now, in oggenc/audio.c, I see that the permutation array is used that way in wav_ieee_read: buffer[j][i] = buf[i*f->channels + f->channel_permute[j]]; To accommodate the specified orders, the permutation array should therefore be: 0, 2, 1, 4, 5, 3 But wav_permute_...

...0004 (FC), plus any one of the 15 other single-bit masks, plus zero. Hope this helps to clarify things. The Microsoft spec for WAVEFORMATEXTENSIBLE is available at: https://sites.google.com/site/mytemporarydownloads/ Scroll down to "The WAVE and WAVE-EX file formats" and look for "multichaud.pdf". Regards, Martin -- Martin J Leese E-mail: martin.leese stanfordalumni.org Web: http://members.tripod.com/martin_leese/

..., the channel mask does not always implicitly contain the number of channels. Not every FLAC or WAVEFORMATEXTENSIBLE file will contain speaker feeds. The FLAC specification needs to allow for this. The Microsoft specification can be viewed at: http://www.ambisonia.com/Members/mleese/file-formats/multichaud.pdf/view The underlying problem is that FLAC has got itself into a mess over channel assignments. The number of channels is specified in the METADATA_BLOCK_STREAMINFO, but using only three bits. (Three bits is insufficient for the channel assignment, even though this information is STREAMINFO.)...