Creates a sample stream from a FLAC file.

    BOOL mem,
    void *file,
    QWORD offset,
    QWORD length,
    DWORD flags


memTRUE = stream the file from memory.
fileFilename (mem = FALSE) or a memory location (mem = TRUE).
offsetFile offset to begin streaming from (only used if mem = FALSE).
lengthData length... 0 = use all data up to the end of the file (if mem = FALSE).
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 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.
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_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 is ignored when streaming from memory (mem = TRUE).
BASS_UNICODEfile is in UTF-16 form. Otherwise it is ANSI on Windows or Windows CE, and UTF-8 on other platforms.

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_NOTAVAILOnly decoding channels (BASS_STREAM_DECODE) are allowed when using the "no sound" device. The BASS_STREAM_AUTOFREE flag is also unavailable to decoding channels.
BASS_ERROR_ILLPARAMThe length must be specified when streaming from memory.
BASS_ERROR_FILEOPENThe file could not be opened.
BASS_ERROR_FILEFORMThe file's format is not recognised/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_UNKNOWNSome other mystery problem!


All FLAC sample resolutions from 8 to 32-bit are supported, but the output will be restricted to 16-bit unless the BASS_SAMPLE_FLOAT flag is used. The file's original resolution is available via BASS_ChannelGetInfo.

Use BASS_ChannelGetInfo to retrieve information on the format (sample rate, resolution, channels) of the stream. The playback length of the stream can be retrieved using BASS_ChannelGetLength. Until the whole file has been streamed, whatever length the file's header says is returned, which may or may not be exact.

FLAC streams have a few different types of tag available via BASS_ChannelGetTags. The FLAC format uses Ogg Vorbis tags, so the standard BASS_TAG_OGG and BASS_TAG_VENDOR tags apply for those. Embedded cuesheets are supported and are available via the BASS_TAG_FLAC_CUE tag, which gives a pointer to a TAG_FLAC_CUE structure. Embedded images are also supported and are available via the BASS_TAG_FLAC_PICTURE+<index> tag (index=0 is the first picture), which gives a pointer to a TAG_FLAC_PICTURE structure. Application metadata blocks are also supported and available via the BASS_TAG_FLAC_METADATA+<index> tag (index=0 is the first block), which gives a pointer to a TAG_FLAC_METADATA structure.

Chained Ogg FLAC files are supported, and a BASS_SYNC_OGG_CHANGE sync can be set via BASS_ChannelSetSync to be informed of when a new bitstream begins during decoding/playback of them, at which point new tags may be available. The length of a chained Ogg FLAC file will be unavailable until the entire file has been decoded, and seeking via BASS_ChannelSetPosition is not possible except for going back to the start (or the BASS_POS_DECODETO option is used).

To stream a file from the internet, use BASS_FLAC_StreamCreateURL. To stream from other locations, see BASS_FLAC_StreamCreateFileUser.


Away from Windows, all mixing is done in software (by BASS), so the BASS_SAMPLE_SOFTWARE flag is unnecessary. The BASS_SAMPLE_FX flag is also ignored.


Create a stream of a FLAC file.
HSTREAM stream=BASS_FLAC_StreamCreateFile(FALSE, "afile.flac", 0, 0, 0);

See also

BASS_FLAC_StreamCreateFileUser, BASS_FLAC_StreamCreateURL

BASS_ChannelGetInfo, BASS_ChannelGetLength, BASS_ChannelGetTags, BASS_ChannelPlay, BASS_ChannelSetAttribute, BASS_ChannelSetDSP, BASS_ChannelSetFX, BASS_ChannelSetLink, BASS_StreamFree, BASS_StreamGetFilePosition