mixGetAudioProperties function mixer

int mixGetAudioProperties(
  1. Pointer<MixAudio> audio
)

Get the properties associated with a MIX_Audio.

SDL_mixer offers some properties of its own, but this can also be a convenient place to store app-specific data.

A SDL_PropertiesID is created the first time this function is called for a given MIX_Audio, if necessary.

The following read-only properties are provided by SDL_mixer:

  • MIX_PROP_METADATA_TITLE_STRING: the audio's title ("Smells Like Teen Spirit").
  • MIX_PROP_METADATA_ARTIST_STRING: the audio's artist name ("Nirvana").
  • MIX_PROP_METADATA_ALBUM_STRING: the audio's album name ("Nevermind").
  • MIX_PROP_METADATA_COPYRIGHT_STRING: the audio's copyright info ("Copyright (c) 1991")
  • MIX_PROP_METADATA_TRACK_NUMBER: the audio's track number on the album (1)
  • MIX_PROP_METADATA_TOTAL_TRACKS_NUMBER: the total tracks on the album (13)
  • MIX_PROP_METADATA_YEAR_NUMBER: the year the audio was released (1991)
  • MIX_PROP_METADATA_DURATION_FRAMES_NUMBER: The sample frames worth of PCM data that comprise this audio. It might be off by a little if the decoder only knows the duration as a unit of time.
  • MIX_PROP_METADATA_DURATION_INFINITE_BOOLEAN: if true, audio never runs out of sound to generate. This isn't necessarily always known to SDL_mixer, though.

Other properties, documented with MIX_LoadAudioWithProperties(), may also be present.

Note that the metadata properties are whatever SDL_mixer finds in things like ID3 tags, and they often have very little standardized formatting, may be missing, and can be completely wrong if the original data is untrustworthy (like an MP3 from a P2P file sharing service).

\param audio the audio to query. \returns a valid property ID on success or 0 on failure; call SDL_GetError() for more information.

\threadsafety It is safe to call this function from any thread.

\since This function is available since SDL_mixer 3.0.0.

extern SDL_DECLSPEC SDL_PropertiesID SDLCALL MIX_GetAudioProperties(MIX_Audio *audio)

Implementation

int mixGetAudioProperties(Pointer<MixAudio> audio) {
  final mixGetAudioPropertiesLookupFunction = _libMixer
      .lookupFunction<
        Uint32 Function(Pointer<MixAudio> audio),
        int Function(Pointer<MixAudio> audio)
      >('MIX_GetAudioProperties');
  return mixGetAudioPropertiesLookupFunction(audio);
}