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add msbc support to python sbc decoder

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This commit is contained in:
Milanka Ringwald 2016-07-08 11:48:14 +02:00
parent b00330a893
commit 05c5673442
2 changed files with 54 additions and 20 deletions
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test/sbc/data/testfile.msbc Normal file
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74
test/sbc/sbc_decoder.py
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@ -9,6 +9,7 @@ from sbc_synthesis_v1 import *
V = np.zeros(shape = (2, 10*2*8))
N = np.zeros(shape = (16,8))
total_time_ms = 0
mSBC_enabled = 1
def sbc_unpack_frame(fin, available_bytes, frame):
if available_bytes == 0:
@ -16,12 +17,17 @@ def sbc_unpack_frame(fin, available_bytes, frame):
raise TypeError
frame.syncword = get_bits(fin,8)
if frame.syncword != 156:
print ("out of sync %02x" % frame.syncword)
return -1
if mSBC_enabled:
if frame.syncword != 173:
print ("out of sync %02x" % frame.syncword)
return -1
else:
if frame.syncword != 156:
print ("out of sync %02x" % frame.syncword)
return -1
frame.sampling_frequency = get_bits(fin,2)
frame.nr_blocks = nr_blocks[get_bits(fin,2)]
frame.channel_mode = get_bits(fin,2)
if frame.channel_mode == MONO:
@ -31,12 +37,10 @@ def sbc_unpack_frame(fin, available_bytes, frame):
frame.allocation_method = get_bits(fin,1)
frame.nr_subbands = nr_subbands[get_bits(fin,1)]
frame.init(frame.nr_blocks, frame.nr_subbands, frame.nr_channels)
frame.bitpool = get_bits(fin,8)
frame.crc_check = get_bits(fin,8)
# frame.join = np.zeros(frame.nr_subbands, dtype = np.uint8)
frame.init(frame.nr_blocks, frame.nr_subbands, frame.nr_channels)
if frame.channel_mode == JOINT_STEREO:
for sb in range(frame.nr_subbands-1):
@ -49,12 +53,40 @@ def sbc_unpack_frame(fin, available_bytes, frame):
for ch in range(frame.nr_channels):
for sb in range(frame.nr_subbands):
frame.scale_factor[ch][sb] = get_bits(fin, 4)
if mSBC_enabled:
#frame.nr_blocks = 16
#frame.bitpool = 26
#frame.nr_subbands = 1
print "frequency: ", frame.sampling_frequency
print "subbands: ", frame.nr_blocks/4-1
print "bitpool: ", frame.bitpool
print "blocks : ", frame.nr_blocks/4-1
print "alloc : ", frame.allocation_method
print "mode : ", frame.channel_mode
print "scale factor: ", frame.scale_factor
crc = calculate_crc(frame)
if crc != frame.crc_check:
print frame
print "error, crc not equal: ", crc, frame.crc_check
exit(1)
print "CRC mismatch: calculated %d, expected %d" % (crc, frame.crc_check)
exit(10)
if mSBC_enabled:
frame.nr_subbands = 8
frame.bitpool = 26
frame.nr_blocks = 15
#frame.sampling_frequency = 0
frame.init(frame.nr_blocks, frame.nr_subbands, frame.nr_channels)
if frame.channel_mode == JOINT_STEREO:
for sb in range(frame.nr_subbands-1):
frame.join[sb] = get_bits(fin,1)
get_bits(fin,1) # RFA
for ch in range(frame.nr_channels):
for sb in range(frame.nr_subbands):
frame.scale_factor[ch][sb] = get_bits(fin, 4)
frame.scalefactor = np.zeros(shape=(frame.nr_channels, frame.nr_subbands), dtype = np.int32)
for ch in range(frame.nr_channels):
@ -266,10 +298,14 @@ if __name__ == "__main__":
print(usage)
sys.exit(1)
try:
mSBC_enabled = 0
infile = sys.argv[1]
if not infile.endswith('.sbc'):
print(usage)
sys.exit(1)
if infile.endswith('.msbc'):
mSBC_enabled = 1
else:
print(usage)
sys.exit(1)
wavfile = infile.replace('.sbc', '-decoded.wav')
fout = False
@ -296,15 +332,13 @@ if __name__ == "__main__":
print "== Frame %d == %d" % (frame_count, fin.tell())
err = sbc_unpack_frame(fin, file_size - fin.tell(), frame)
if frame_count == 0:
sbc_init_sythesis(frame.nr_subbands, implementation)
print frame
if err:
print "error, frame_count: ", frame_count
break
continue
if frame_count == 0:
sbc_init_sythesis(frame.nr_subbands, implementation)
print frame
sbc_decode(frame, implementation)