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> I notice that mplayer2 can handle your ACELP example, but mplayer and
Winamp cannot. > Is there a list somewhere of codecs supported by WMP? Is it possible to create > user-defined plug-ins and additional codec identifier definitions for WMP so they can > handle other codec types? My company does work on mil/gov codecs like MELPe; making > it possible for people to click on a MELPe compressed file using WMP would be very > convenient. Yes, to write your own Winamp decoder plug-in, read this: http://www.winamp.com/nsdn/winamp2x/dev/plugins/in.jhtml -Mark > -Jeff > > --- Jeff Brower <> wrote: > > > Shaofeng- > > > > > > > The 'fact' chunk is required for all compressed > > > audio > > > > formats, and for the case where the data is > > > included > > > > in 'wavl' list chunk. > > > > > > What kind of .wav files typically contain non-PCM > > > data? Can you give some > > > typical examples? Do they still have .wav > > > extensions, or some other > > > extensions? > > > > > > Thanks. > > > > > > -Jeff > > > > > > > --- Jeff Brower <> wrote: > > > >> Shaofeng- > > > >> > > > >> FWIW, most .wav files are 44 byte header (e.g. > > > >> Microsoft examples included with > > > >> WinXX) and don't have the 'fact' tag. > > > >> > > > >> Jeff Brower > > > >> system engineer > > > >> Signalogic > > > >> > > > >> Shaofeng Li wrote: > > > >> > > > > >> > Padmalatha, > > > >> > > > > >> > You can refer to this link for wave format: > > > >> > > > > >> > > > > >> > > > > > > > > > http://ccrma-www.stanford.edu/CCRMA/Courses/422/projects/WaveFormat/ > > > >> > > > > >> > Your wave file is formatted as follows: > > > >> > > > > >> > Chunk Id = 'RIFF' > > > >> > Chunk Size = 5996 > > > >> > Format = 'WAVE' > > > >> > > > > >> > Subchunk Id = 'fmt ' > > > >> > Subchunk Size = 18 > > > >> > AudioFormat = 0x0007 (WAVE_FORMAT_MULAW) > > > >> > NumChannels = 1 > > > >> > SampleRate = 8000 > > > >> > ByteRate = 8000 > > > >> > BlockAlign = 1 > > > >> > BitsPerSample = 8 > > > >> > ExtraParamLen = 2 > > > >> > ExtraParamVal = 0x0000 > > > >> > > > > >> > Subchunk Id = 'fact' > > > >> > Subchunk Size = 4 > > > >> > Subchunk Val = 0xe8160000 > > > >> > > > > >> > Subchunk Id = 'data' > > > >> > Subchunk Size = 5864 > > > >> > > > > >> > Regards, > > > >> > /Shaofeng > > > >> > > > > >> > --- Padmalatha Y <> > > > wrote: > > > >> > > Hi All, > > > >> > > > > > >> > > Can any one tell me the wave header > > > for > > > >> > > mu-law and A-law. I have a wave file which is > > > >> mu-law > > > >> > > 8-bit mono which has 56 bytes as header. I > > > want > > > >> to > > > >> > > know in what format are these bytes arranged. > > > >> The > > > >> > > following 56 byte header is provided for > > > >> reference. > > > >> > > > > > >> > > 52 49 46 46 6C 17 00 00 57 41 56 45 66 6D 74 > > > 20 > > > >> > > 12 00 00 00 07 00 01 00 40 1F 00 00 40 1F 00 > > > 00 > > > >> > > 01 00 08 00 00 00 66 61 63 74 04 00 00 00 E8 > > > 16 > > > >> > > 00 00 64 61 74 61 E8 16 00 00 > > > >> > > > > > >> > > > > > >> > > Thanks in advance, > > > >> > > Padmalatha > > _____________________________________ > Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. > > _____________________________________ > About this discussion group: > > To Join: > > To Post: > > To Leave: > > Archives: http://www.yahoogroups.com/group/speechcoding > > Other DSP-Related Groups: http://www.dsprelated.com > ">http://docs.yahoo.com/info/terms/ |
Re: Wave header format for mu-law and A-law
Started by ●September 2, 2003
Reply by ●September 2, 20032003-09-02
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Jeff, > Is there a list somewhere of codecs supported by > WMP? See this link for IANA WAVE and AVI codec registry: http://www.iana.org/assignments/wave-avi-codec-registry > Is it possible to create > user-defined plug-ins and additional codec > identifier definitions for WMP so they can > handle other codec types? Yes. You can create your Audio Compression Manager (ACM) driver which takes in charge a codec type on Microsoft platform. Refer to this link for more information: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/w98ddk/hh/w98dd\ k/mmedia_4vjs.asp Regards, /Shaofeng. __________________________________ |
Reply by ●September 16, 20032003-09-16
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It is a nice wish, but... Is that MELPe codec licensing free? As company that "does work" on mil/gov codecs like MELPe, does that give you any right to make commercial use of it? Do you hold the intellectual property rights to that MELPe codec? (if not then who does? and will they allow distributing such plug-in?) JJ --- In , Jeff Brower <jbrower@s...> wrote: > Ok, I think I've got it now: the fmt tag contains the PCM identifier/codec ID and > the length of compressed data; the FACT tag is a placeholder to provide the length of > PCM data after compression, since there's not a spot for it in the standard fmt tag. > Is that correct? > > I notice that mplayer2 can handle your ACELP example, but mplayer and Winamp cannot. > Is there a list somewhere of codecs supported by WMP? Is it possible to create > user-defined plug-ins and additional codec identifier definitions for WMP so they can > handle other codec types? My company does work on mil/gov codecs like MELPe; making > it possible for people to click on a MELPe compressed file using WMP would be very > convenient. > > -Jeff |
