def algorithm1(dash):
max_buffer = dash.max_buffer
r = max_buffer * 0.3
cu = max_buffer * (0.9 - 0.3)
T = dash.get_throughput()
quality = dash.quality
buffer_len = dash.buffer_len
new_quality = quality
max_quality = len(dash.mpd["bitrates"])
next_chunks_size = dash.get_chunks_size()
duration = dash.segment_len
ref = 1
for i in range(1, max_quality):
if next_chunks_size[i] / duration > T:
ref = i - 1
break
if buffer_len <= r :
for i in range(1, max_quality):
if next_chunks_size[i] > (duration - buffer_len) * T:
tmp = i - 1
break
new_quality = max(tmp,1)
elif buffer_len >= (r + cu) :
new_quality = max_quality
else:
new_quality = ref
dash.select(new_quality)
def PBAC2(dash):
max_buffer = dash.max_buffer
r = max_buffer * 0.3
cu = max_buffer * (0.9 - 0.3)
T = dash.get_throughput()
quality = dash.quality
buffer_len = dash.buffer_len
new_quality = quality
max_quality = len(dash.mpd["bitrates"])
next_chunks_size = dash.get_chunks_size()
duration = dash.segment_len
ref = 1
for i in range(1, max_quality):
if next_chunks_size[i] / duration > T:
ref = i - 1
break
if buffer_len <= r :
ref = max(ref-1,1)
if ref < quality:
for i in range(1, max_quality):
if next_chunks_size[i] > (duration - buffer_len) * T:
tmp = i - 1
break
new_quality = max(tmp,1)
else:
new_quality = ref
elif buffer_len >= (r + cu) :
new_quality = max_quality
#new_quality = max(ref,quality)
else:
if ref < quality :
new_quality = quality
else:
buffergap = duration * (T/next_chunks_size[ref]-1)
bufferemp = max_buffer - buffer_len
if buffergap > 0.15 * bufferemp:
new_quality = ref
else:
new_quality = ref - 1
dash.select(new_quality)
