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API documentation for libmpg123, libout123, and libsyn123

Note: This API doc is automatically generated from the current development version that you can get via Subversion or as a daily snapshot from http://mpg123.org/snapshot. There may be differences (additions) compared to the latest stable release. See NEWS.libmpg123, NEWS.libout123, NEWS.libsyn123, and the overall NEWS file on libmpg123 versions and important changes between them.
Let me emphasize that the policy for the lib*123 family is to always stay backwards compatible -- only additions are planned (and it's not yet planned to change the plans;-).
mpg123 advanced parameter API

Typedefs

typedef struct mpg123_pars_struct mpg123_pars
 

Functions

MPG123_EXPORT mpg123_handlempg123_parnew (mpg123_pars *mp, const char *decoder, int *error)
 
MPG123_EXPORT mpg123_parsmpg123_new_pars (int *error)
 
MPG123_EXPORT void mpg123_delete_pars (mpg123_pars *mp)
 
MPG123_EXPORT int mpg123_fmt_none (mpg123_pars *mp)
 
MPG123_EXPORT int mpg123_fmt_all (mpg123_pars *mp)
 
MPG123_EXPORT int mpg123_fmt (mpg123_pars *mp, long rate, int channels, int encodings)
 
MPG123_EXPORT int mpg123_fmt2 (mpg123_pars *mp, long rate, int channels, int encodings)
 
MPG123_EXPORT int mpg123_fmt_support (mpg123_pars *mp, long rate, int encoding)
 
MPG123_EXPORT int mpg123_par (mpg123_pars *mp, enum mpg123_parms type, long value, double fvalue)
 
MPG123_EXPORT int mpg123_getpar (mpg123_pars *mp, enum mpg123_parms type, long *value, double *fvalue)
 

Detailed Description

Direct access to a parameter set without full handle around it. Possible uses:

The functions for handling mpg123_pars (mpg123_par() and mpg123_fmt() family) directly return a fully qualified mpg123 error code, the ones operating on full handles normally MPG123_OK or MPG123_ERR, storing the specific error code itseld inside the handle.

Typedef Documentation

◆ mpg123_pars

typedef struct mpg123_pars_struct mpg123_pars

Opaque structure for the libmpg123 decoder parameters.

Definition at line 1554 of file mpg123.h.

Function Documentation

◆ mpg123_parnew()

MPG123_EXPORT mpg123_handle* mpg123_parnew ( mpg123_pars mp,
const char *  decoder,
int *  error 
)

Create a handle with preset parameters.

Parameters
mpparameter handle
decoderdecoder choice
errorerror code return address
Returns
mpg123 handle

◆ mpg123_new_pars()

MPG123_EXPORT mpg123_pars* mpg123_new_pars ( int *  error)

Allocate memory for and return a pointer to a new mpg123_pars

Parameters
errorerror code return address
Returns
new parameter handle

◆ mpg123_delete_pars()

MPG123_EXPORT void mpg123_delete_pars ( mpg123_pars mp)

Delete and free up memory used by a mpg123_pars data structure

Parameters
mpparameter handle

◆ mpg123_fmt_none()

MPG123_EXPORT int mpg123_fmt_none ( mpg123_pars mp)

Configure mpg123 parameters to accept no output format at all, use before specifying supported formats with mpg123_format

Parameters
mpparameter handle
Returns
MPG123_OK on success

◆ mpg123_fmt_all()

MPG123_EXPORT int mpg123_fmt_all ( mpg123_pars mp)

Configure mpg123 parameters to accept all formats (also any custom rate you may set) – this is default.

Parameters
mpparameter handle
Returns
MPG123_OK on success

◆ mpg123_fmt()

MPG123_EXPORT int mpg123_fmt ( mpg123_pars mp,
long  rate,
int  channels,
int  encodings 
)

Set the audio format support of a mpg123_pars in detail:

Parameters
mpparameter handle
rateThe sample rate value (in Hertz).
channelsA combination of MPG123_STEREO and MPG123_MONO.
encodingsA combination of accepted encodings for rate and channels, p.ex MPG123_ENC_SIGNED16|MPG123_ENC_ULAW_8 (or 0 for no support).
Returns
MPG123_OK on success

◆ mpg123_fmt2()

MPG123_EXPORT int mpg123_fmt2 ( mpg123_pars mp,
long  rate,
int  channels,
int  encodings 
)

Set the audio format support of a mpg123_pars in detail:

Parameters
mpparameter handle
rateThe sample rate value (in Hertz). Special value 0 means all rates (reason for this variant of mpg123_fmt).
channelsA combination of MPG123_STEREO and MPG123_MONO.
encodingsA combination of accepted encodings for rate and channels, p.ex MPG123_ENC_SIGNED16|MPG123_ENC_ULAW_8 (or 0 for no support).
Returns
MPG123_OK on success

◆ mpg123_fmt_support()

MPG123_EXPORT int mpg123_fmt_support ( mpg123_pars mp,
long  rate,
int  encoding 
)

Check to see if a specific format at a specific rate is supported by mpg123_pars.

Parameters
mpparameter handle
ratesampling rate
encodingencoding
Returns
0 for no support (that includes invalid parameters), MPG123_STEREO, MPG123_MONO or MPG123_STEREO|MPG123_MONO.

◆ mpg123_par()

MPG123_EXPORT int mpg123_par ( mpg123_pars mp,
enum mpg123_parms  type,
long  value,
double  fvalue 
)

Set a specific parameter, for a specific mpg123_pars, using a parameter type key chosen from the mpg123_parms enumeration, to the specified value.

Parameters
mpparameter handle
typeparameter choice
valueinteger value
fvaluefloating point value
Returns
MPG123_OK on success

◆ mpg123_getpar()

MPG123_EXPORT int mpg123_getpar ( mpg123_pars mp,
enum mpg123_parms  type,
long *  value,
double *  fvalue 
)

Get a specific parameter, for a specific mpg123_pars. See the mpg123_parms enumeration for a list of available parameters.

Parameters
mpparameter handle
typeparameter choice
valueinteger value return address
fvaluefloating point value return address
Returns
MPG123_OK on success
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