Feed data from an AVFifoBuffer to a user-supplied callback.
Similar as av_fifo_gereric_read but without discarding data.
@param f AVFifoBuffer to read from
@param buf_size number of bytes to read
@param func generic read function
@param dest data destination
Feed data from an AVFifoBuffer to a user-supplied callback. Similar as av_fifo_gereric_read but without discarding data. @param f AVFifoBuffer to read from @param buf_size number of bytes to read @param func generic read function @param dest data destination