Creates a sample stream from an ALAC file on the internet, optionally receiving the downloaded data in a callback.
HSTREAM BASS_ALAC_StreamCreateURL( char *url, DWORD offset, DWORD flags, DOWNLOADPROC *proc, void *user );
|url||URL of the file to stream. Should begin with "http://" or "https://" or "ftp://".|
|offset||File position to start streaming from. This is ignored by some servers, specifically when the file length is unknown.|
|flags||A combination of these flags.
|proc||Callback function to receive the file as it is downloaded... NULL = no callback.|
|user||User instance data to pass to the callback function.|
Return valueIf successful, the new stream's handle is returned, else 0 is returned. Use BASS_ErrorGetCode to get the error code.
|BASS_ERROR_INIT||BASS_Init has not been successfully called.|
|BASS_ERROR_NOTAVAIL||Only 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_NONET||No internet connection could be opened.|
|BASS_ERROR_ILLPARAM||url is not a valid URL.|
|BASS_ERROR_SSL||SSL/HTTPS support is not available.|
|BASS_ERROR_TIMEOUT||The server did not respond to the request within the timeout period, as set with the BASS_CONFIG_NET_TIMEOUT config option.|
|BASS_ERROR_FILEOPEN||The file could not be opened.|
|BASS_ERROR_FILEFORM||The file's format is not recognised/supported.|
|BASS_ERROR_FORMAT||The 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 (ie. no WDM drivers).|
|BASS_ERROR_SPEAKER||The 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_MEM||There is insufficient memory.|
|BASS_ERROR_NO3D||Could not initialize 3D support.|
|BASS_ERROR_MP4_NOSTREAM||The file cannot be streamed due to its MP4 atom order; "moov" should come before "mdat".|
|BASS_ERROR_UNKNOWN||Some other mystery problem!|
RemarksIn order to stream an ALAC file, its "moov" atom must come before its "mdat" atom.
When playing the stream, BASS will stall the playback if there is insufficient data to continue playing. Playback will automatically be resumed when sufficient data has been downloaded. BASS_ChannelIsActive can be used to check if the playback is stalled, and the progress of the file download can be checked with BASS_StreamGetFilePosition.
When streaming in blocks (BASS_STREAM_BLOCK flag), be careful not to stop/pause the stream for too long, otherwise the connection may timeout due to there being no activity and the stream will end prematurely.
When using an offset, the file length returned by BASS_StreamGetFilePosition can be used to check that it was successful by comparing it with the original file length. Another way to check is to inspect the HTTP headers retrieved with BASS_ChannelGetTags.
Platform-specificAway 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.
See alsoBASS_ALAC_StreamCreateFile, BASS_ALAC_StreamCreateFileUser
BASS_ChannelGetInfo, BASS_ChannelGetLength, BASS_ChannelGetTags, BASS_ChannelPlay, BASS_ChannelSetAttribute, BASS_ChannelSetDSP, BASS_ChannelSetFX, BASS_ChannelSetLink, BASS_StreamFree, DOWNLOADPROC callback, BASS_CONFIG_NET_AGENT, BASS_CONFIG_NET_BUFFER, BASS_CONFIG_NET_PREBUF, BASS_CONFIG_NET_PROXY, BASS_CONFIG_NET_TIMEOUT