BASS_WEBM_StreamCreateFileUser


Creates a sample stream from a WebM or Matroska file via user callback functions.

HSTREAM BASS_WEBM_StreamCreateFileUser(
    DWORD system,
    DWORD flags,
    BASS_FILEPROCS *procs,
    void *user,
    DWORD track
);

Parameters

systemFile system to use, one of the following.
STREAMFILE_NOBUFFERUnbuffered.
STREAMFILE_BUFFERBuffered.
STREAMFILE_BUFFERPUSHBuffered, with the data pushed to BASS via BASS_StreamPutFileData.
flagsA combination of these flags.
BASS_SAMPLE_FLOATUse 32-bit floating-point sample data. See Floating-point channels for info.
BASS_SAMPLE_SOFTWAREForce the stream to not use hardware DirectSound mixing.
BASS_SAMPLE_3DEnable 3D functionality. This requires that the BASS_DEVICE_3D flag was specified when calling BASS_Init, and the stream must be mono. The SPEAKER flags can not be used together with this flag.
BASS_SAMPLE_LOOPLoop the file. This flag can be toggled at any time using BASS_ChannelFlags. This flag is ignored when streaming in blocks (BASS_STREAM_BLOCK).
BASS_SAMPLE_FXEnable the old implementation of DirectX 8 effects. See the DX8 effect implementations section for details. Use BASS_ChannelSetFX to add effects to the stream.
BASS_STREAM_RESTRATERestrict the "download" rate of the file to the rate required to sustain playback. If this flag is not used, then the file will be downloaded as quickly as possible. This flag only has effect when using the STREAMFILE_BUFFER system.
BASS_STREAM_BLOCKDownload and play the file in smaller chunks. Uses a lot less memory than otherwise, but it is not possible to seek or loop the stream; once it has ended, the file must be opened again to play it again. This flag will automatically be applied when the file length is unknown. This flag also has the effect of restricting the download rate. This flag has no effect when using the STREAMFILE_NOBUFFER system.
BASS_STREAM_AUTOFREEAutomatically free the stream when playback ends.
BASS_STREAM_DECODEDecode the sample data, without playing it. Use BASS_ChannelGetData to retrieve decoded sample data. The BASS_SAMPLE_3D, BASS_STREAM_AUTOFREE and SPEAKER flags can not be used together with this flag. The BASS_SAMPLE_SOFTWARE and BASS_SAMPLE_FX flags are also ignored.
BASS_SPEAKER_xxxSpeaker assignment flags. These flags have no effect when the stream is more than stereo.
BASS_ASYNCFILERead the file asynchronously. When enabled, the file is read and buffered in parallel with the decoding, to reduce the chances of the decoder being affected by I/O delays. This can be particularly useful with slow storage media and/or low latency output. The size of the file buffer is determined by the BASS_CONFIG_ASYNCFILE_BUFFER config option. This flag only applies when using the STREAMFILE_NOBUFFER system.
procsThe user defined file functions.
userUser instance data to pass to the callback functions.
trackThe track to play from the file... 1 = first, 0 = first playable track. When requesting the first playable track, all tracks will be checked in numerical order until a playable one is found. The active track is available via the BASS_ATTRIB_WEBM_TRACK attribute.

Return value

If successful, the new stream's handle is returned, else 0 is returned. Use BASS_ErrorGetCode to get the error code.

Error codes

BASS_ERROR_INITBASS_Init has not been successfully called.
BASS_ERROR_NOTAVAILThe BASS_STREAM_AUTOFREE flag cannot be combined with the BASS_STREAM_DECODE flag.
BASS_ERROR_ILLPARAMsystem is not valid.
BASS_ERROR_FILEFORMThe file's format is not recognised/supported.
BASS_ERROR_NOTAUDIOThe track or file does not contain audio.
BASS_ERROR_CODECThe file uses a codec that is not available/supported.
BASS_ERROR_FORMATThe sample format is not supported by the device/drivers. If the stream is more than stereo or the BASS_SAMPLE_FLOAT flag is used, it could be that they are not supported.
BASS_ERROR_SPEAKERThe specified SPEAKER flags are invalid. The device/drivers do not support them, they are attempting to assign a stereo stream to a mono speaker or 3D functionality is enabled.
BASS_ERROR_MEMThere is insufficent memory.
BASS_ERROR_NO3DCould not initialize 3D support.
BASS_ERROR_WEBM_TRACKtrack is invalid.
BASS_ERROR_UNKNOWNSome other mystery problem!

Remarks

This is a user file version of the BASS_WEBM_StreamCreateFile function and the remarks in its documentation also apply here.

When using the buffered file system, if the file has tags located at the end of it then they will not be available until the entire file has been "downloaded". If the file does not contain duration information in its headers then the length will not be available from BASS_ChannelGetLength until the end.

See also

BASS_WEBM_StreamCreateFile, BASS_WEBM_StreamCreateURL

BASS_ChannelGetInfo, BASS_ChannelGetLength, BASS_ChannelGetTags, BASS_ChannelPlay, BASS_ChannelSetAttribute, BASS_ChannelSetDSP, BASS_ChannelSetFX, BASS_ChannelSetLink, BASS_StreamFree, BASS_FILEPROCS structure, BASS_CONFIG_NET_BUFFER