Trying to implement a callback function of libvlc problem with the types variables to pass

[aurquiel]

Hello

I am trying to do a callback function of libvlc

Function of libvlc

Callback function open

Callback function read

const int tamanio_buffer=1024;                                                              
unsigned char MPEG2_TS[tamanio_buffer]; 
libvlc_instance_t       *instancia_vlc_hilo;

int media_open_cb(void *opaque, void **datap, uint64_t *sizep) {
    *sizep = 1024;
    *datap = opaque;
    return 0;
}

ss media_read_cb(void *opaque, unsigned char *buf, int len) {

    return len;
}

void media_close_cb(void *opaque) {

}


libvlc_media_t *media_hilo = libvlc_media_new_callbacks(
                                    instancia_vlc_hilo,
                                         media_open_cb,
                                         media_read_cb,
                                                  NULL,
                                                  NULL,
                                              MPEG2_TS);

But i can't compile it

Error

||=== Build: Debug in gtk3cpp (compiler: GNU GCC Compiler) ===|
/home/pasante/Escritorio/espaniol/gtk3cpp_archivo/include/thread.h|50|error: invalid conversion from ‘long int (*)(void*, unsigned char*, int)’ to ‘libvlc_media_read_cb {aka long int (*)(void*, unsigned char*, long unsigned int)}’ [-fpermissive]|
/usr/include/vlc/libvlc_media.h|438|note:   initializing argument 3 of ‘libvlc_media_t* libvlc_media_new_callbacks(libvlc_instance_t*, libvlc_media_open_cb, libvlc_media_read_cb, libvlc_media_seek_cb, libvlc_media_close_cb, void*)’|
||=== Build failed: 1 error(s), 0 warning(s) (0 minute(s), 1 second(s)) ===|

I don't know why it can't convert the variables if there are the same type

[jsulm]

@aurquiel Please read the error message again: both function pointer types are not same:

invalid conversion from ‘long int (*)(void*, unsigned char*, int)’ to ‘libvlc_media_read_cb {aka long int (*)(void*, unsigned char*, long unsigned int)

int != long unsigned int

[aurquiel]

int media_open_cb(void *opaque, void **datap, long unsigned int *sizep) {
    *sizep = 1024;
    *datap = opaque;
    return 0;
}

int media_read_cb(void *opaque, unsigned char *buf, long unsigned int len) {

    return len;
}

void media_close_cb(void *opaque) {

}


libvlc_media_t *media_hilo = libvlc_media_new_callbacks(
                                    instancia_vlc_hilo,
                                         media_open_cb,
                                         media_read_cb,
                                                  NULL,
                                                  NULL,
                                              MPEG2_TS);

i tray changing the parameters to long unsigned int

||=== Build: Debug in gtk3cpp (compiler: GNU GCC Compiler) ===|
/home/pasante/Escritorio/espaniol/gtk3cpp_archivo/include/thread.h|50|error: invalid conversion from ‘int ()(void, unsigned char*, long unsigned int)’ to ‘libvlc_media_read_cb {aka long int ()(void, unsigned char*, long unsigned int)}’ [-fpermissive]|
/usr/include/vlc/libvlc_media.h|438|note: initializing argument 3 of ‘libvlc_media_t* libvlc_media_new_callbacks(libvlc_instance_t*, libvlc_media_open_cb, libvlc_media_read_cb, libvlc_media_seek_cb, libvlc_media_close_cb, void*)’|
||=== Build failed: 1 error(s), 0 warning(s) (0 minute(s), 1 second(s)) ===|

I can't figure out

[jsulm]

@aurquiel Again - read the error message.
Return types are different: int != long