Creates a sample stream from an FLAC file on the internet, optionally receiving the downloaded data in a callback function.
HSTREAM BASS_FLAC_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.|
|BASS_ERROR_INIT||BASS_Init has not been successfully called.|
|BASS_ERROR_NOTAVAIL||The BASS_STREAM_AUTOFREE flag cannot be combined with the BASS_STREAM_DECODE flag.|
|BASS_ERROR_NONET||No internet connection could be opened.|
|BASS_ERROR_ILLPARAM||url is not a valid URL.|
|BASS_ERROR_PROTOCOL||The protocol in url is not supported.|
|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.|
|BASS_ERROR_SPEAKER||The specified SPEAKER flags are invalid.|
|BASS_ERROR_MEM||There is insufficent memory.|
|BASS_ERROR_NO3D||Could not initialize 3D support.|
|BASS_ERROR_UNKNOWN||Some other mystery problem!|
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. 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 streams 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. FLAC does not have a constant or nominal bitrate; the BASS_ATTRIB_BITRATE attribute will give the average bitrate from the start to the current position.
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.
BASS_ChannelGetInfo, BASS_ChannelGetLength, BASS_ChannelGetTags, BASS_ChannelPlay, BASS_ChannelSetAttribute, BASS_ChannelSetDSP, BASS_ChannelSetFX, BASS_StreamFree, BASS_StreamGetFilePosition, DOWNLOADPROC callback, BASS_CONFIG_NET_AGENT, BASS_CONFIG_NET_BUFFER, BASS_CONFIG_NET_PREBUF, BASS_CONFIG_NET_PROXY, BASS_CONFIG_NET_TIMEOUT