Algorithm 1. Client algorithm.

(1)Sample the data rate and put it in an array; (2)$\mathrm{Find}\mathrm{maxima}{L}_{max}$: (i)$\mathrm{Input}\mathrm{bit}\mathrm{rate}\mathrm{samples}\mathrm{in}\mathrm{pairs}\mathrm{of}\mathrm{three}\left(v_1,v_2,v_3\right)$; (ii)$\mathrm{If}\left(v_1<v_2>v_3\right)$, add $v_2$ to $L_{max}$, # find maximum bit rate; (iii)Continue step 2 until $N$ received frames; (3)$\mathrm{Find}\mathrm{minima}{L}_{\min }$: (i)$\mathrm{Input}\mathrm{bit}\mathrm{rate}\mathrm{samples}\mathrm{in}\mathrm{pairs}\mathrm{of}\mathrm{three}\left(v_1,v_2,v_3\right)$; (ii)$\mathrm{If}\left(v_1>v_2<v_3\right)$, add $v_2$ to $L_{\min }$, # find minimum bit rate; (iii)Continue step 3 until $N$ received frames; (4)$Max=Analyse\left(L_{max}\right)$, # Call procedure to acquire $\alpha ,\beta ,\mathrm{and}\gamma$; (5)$Min=Analyse\left(L_{min}\right)$, # Call procedure to acquire $\alpha ,\beta ,\mathrm{and}\gamma$; (6)Find status: (2)   (i) $\mathrm{If}\left(Max==\beta \&\&Min==\beta \right)$, set Status as Progressive; (ii) $\mathrm{Else}\mathrm{if}\left(Max==\alpha \&\&Min==\beta \right)$, set Status as Stabilized; (iii) $\mathrm{Else}\mathrm{if}\left(Max==\beta \&\&Min==\alpha \right)$, set Status as Fluctuated; (iv) $\mathrm{Else}\mathrm{if}\left(Max==\alpha \&\&Min==\alpha \right)$, set Status as Degraded; (v) $\mathrm{If}\left(Max==\gamma \left|\right|Min==\gamma \right)$, set Status as non-monotonic and call Find_rms (Bit rates); A. function Analyze (Bit rates): Read start data point, startp; Read end data point, endp; Find median value, medianp; If (startp, medianp, endp) tends to monotonic increase, return $\beta$; Else if (startp, medianp, endp) tends to monotonic decrease, return $\alpha$; If (startp, medianp and endp) tends to neither monotonic increase nor decrease, return $\gamma$; B. function Find_RMS (Bit rate): Calculate the root mean square (RMS) of the samples; $X_{rms}=\sqrt{1/n(x_1^2+x_2^2+\dots +x_n^2)}$ Divide the N different samples into M segments (M = 3); Continue Step1 to find the RMS values of each segments: ${\mathrm{rms}}_1{,\mathrm{rms}}_2{,\mathrm{and}\mathrm{rms}}_3$; Compute the difference among the overall RMS and the RMS of the corresponding segments; Calculate $dif{f}_1=RMS-rm{s}_1$; Calculate $dif{f}_2=RMS-rm{s}_2$; Calculate $dif{f}_3=RMS-rm{s}_{3 }$; If $\left(dif{f}_1<=dif{f}_2<=dif{f}_3\right)$, then return 1; Else if $\left(dif{f}_1>=dif{f}_2>=dif{f}_3\right)$, then return 0; Else return 2.