|MPG123_EXPORT int||mpg123_replace_buffer (mpg123_handle *mh, unsigned char *data, size_t size)|
|MPG123_EXPORT size_t||mpg123_outblock (mpg123_handle *mh)|
|MPG123_EXPORT int||mpg123_replace_reader (mpg123_handle *mh, ssize_t(*r_read)(int, void *, size_t), off_t(*r_lseek)(int, off_t, int))|
|MPG123_EXPORT int||mpg123_replace_reader_handle (mpg123_handle *mh, ssize_t(*r_read)(void *, void *, size_t), off_t(*r_lseek)(void *, off_t, int), void(*cleanup)(void *))|
You may want to do tricky stuff with I/O that does not work with mpg123's default file access or you want to make it decode into your own pocket...
The max size of one frame's decoded output with current settings. Use that to determine an appropriate minimum buffer size for decoding one frame.
Replace default internal buffer with user-supplied buffer. Instead of working on it's own private buffer, mpg123 will directly use the one you provide for storing decoded audio. Note that the required buffer size could be bigger than expected from output encoding if libmpg123 has to convert from primary decoder output (p.ex. 32 bit storage for 24 bit output.
|data||pointer to user buffer|
|size||of buffer in bytes|
|MPG123_EXPORT int mpg123_replace_reader||(||mpg123_handle *||mh,|
|ssize_t(*)(int, void *, size_t)||r_read,|
|off_t(*)(int, off_t, int)||r_lseek|
Replace low-level stream access functions; read and lseek as known in POSIX. You can use this to make any fancy file opening/closing yourself, using mpg123_open_fd() to set the file descriptor for your read/lseek (doesn't need to be a "real" file descriptor...). Setting a function to NULL means that the default internal read is used (active from next mpg123_open call on). Note: As it would be troublesome to mess with this while having a file open, this implies mpg123_close().
|MPG123_EXPORT int mpg123_replace_reader_handle||(||mpg123_handle *||mh,|
|ssize_t(*)(void *, void *, size_t)||r_read,|
|off_t(*)(void *, off_t, int)||r_lseek,|
Replace I/O functions with your own ones operating on some kind of handle instead of integer descriptors. The handle is a void pointer, so you can pass any data you want... mpg123_open_handle() is the call you make to use the I/O defined here. There is no fallback to internal read/seek here. Note: As it would be troublesome to mess with this while having a file open, this mpg123_close() is implied here.
|r_read||The callback for reading (behaviour like posix read).|
|r_lseek||The callback for seeking (like posix lseek).|
|cleanup||A callback to clean up an I/O handle on mpg123_close, can be NULL for none (you take care of cleaning your handles).|