dmMPEG1AudioHeaderGetParams(3dm)	      dmMPEG1AudioHeaderGetParams(3dm)

NAME    [Toc]    [Back]

     dmMPEG1AudioHeaderGetParams - get decoder parameter information from a
     header of any compressed MPEG1 audio data block.

SYNOPSIS    [Toc]    [Back]

     #include <dmedia/dmedia.h>
     #include <dmedia/dm_audioutil.h>

     DMstatus dmMPEG1AudioHeaderGetParams(unsigned char	*cmpData,
					  DMparams *params)

PARAMETER    [Toc]    [Back]

     cmpData
	  points to a block of data bytes presumed to constitute the
	  compressed data stream and start with	a MPEG audio header.


     params
	  List of parameters for specification.

RETURNED VALUE    [Toc]    [Back]

     Returns DM_FAILURE	or DM_SUCCESS.

DESCRIPTION    [Toc]    [Back]

     dmMPEG1AudioHeaderGetParams(3dm) extracts MPEG1 audio compression
     parameter information from	a header of a compressed data stream without
     going so far as to	decompress the data.  These parameter values are then
     stored in DMparams	*params	structure and can be used to set decoder
     parameters	by a call to dmMPEG1AudioDecoderSetParams(3dm).

     Extracted parameters from a compressed bit	strem header are as follows:
	  DM_AUDIO_BITRAT
	  DM_AUDIO_RATE
	  DM_AUDIO_CHANNELS
	  DM_MPEG1_AUDIO_LAYER
	  DM_MPEG1_AUDIO_BITRATE_POLICY

     The other three parameter values are set to decoder defaults:
	  DM_AUDIO_FORMAT
	  (set to DM_AUDIO_TWOS_COMPLEMENT)
	  DM_AUDIO_WIDTH
	  (set to DM_AUDIO_WIDTH_16)
	  DM_AUDIO_CHANNEL_POLICY
	  (set to DM_MPEG1_AUDIO_CONSTANT_QUALITY)







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dmMPEG1AudioHeaderGetParams(3dm)	      dmMPEG1AudioHeaderGetParams(3dm)

NOTE    [Toc]    [Back]

SEE ALSO
     dmMPEG1AudioDecoderCreate(3dm), dmMPEG1AudioDecoderSetParams(3dm),
     dmMPEG1AudioDecoderGetParams(3dm),	dmMPEG1AudioDecode(3dm).


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