4.3.7 Mix_Pause

void Mix_Pause(int channel)

channel

Channel to pause on, or -1 for all channels.

Pause channel, or all playing channels if -1 is passed in. You may still halt a paused channel.
Note: Only channels which are actively playing will be paused.

// pause all sample playback Mix_Pause(-1);

See Also:
4.3.8 Mix_Resume, 4.3.14 Mix_Paused, 4.3.9 Mix_HaltChannel