xref: /btstack/test/sbc/sbc_decoder_test.py (revision 360243be41f47158adff357b9fead2686419a2df) 
1#!/usr/bin/env python
2import numpy as np
3import wave
4import struct
5import sys
6from sbc import *
7from sbc_encoder import *
8from sbc_decoder import *
9
10error = 0.99
11max_error = -1
12
13def sbc_compare_pcm(frame_count, actual_frame, expected_frame):
14    global error, max_error
15    for ch in range(actual_frame.nr_channels):
16        M = mse(actual_frame.pcm[ch], expected_frame.pcm[ch])
17        if M > max_error:
18            max_error = M
19
20        if max_error > error:
21            print "pcm error (%d, %f ) " % (frame_count, max_error)
22            return -1
23    return 0
24
25
26def sbc_compare_headers(frame_count, actual_frame, expected_frame):
27    if actual_frame.sampling_frequency != expected_frame.sampling_frequency:
28        print "sampling_frequency wrong ", actual_frame.sampling_frequency
29        return -1
30
31    if actual_frame.nr_blocks != expected_frame.nr_blocks:
32        print "nr_blocks wrong ", actual_frame.nr_blocks
33        return -1
34
35    if actual_frame.channel_mode != expected_frame.channel_mode:
36        print "channel_mode wrong ", actual_frame.channel_mode
37        return -1
38
39    if actual_frame.nr_channels != expected_frame.nr_channels:
40        print "nr_channels wrong ", actual_frame.nr_channels
41        return -1
42
43    if actual_frame.allocation_method != expected_frame.allocation_method:
44        print "allocation_method wrong ", actual_frame.allocation_method
45        return -1
46
47    if actual_frame.nr_subbands != expected_frame.nr_subbands:
48        print "nr_subbands wrong ", actual_frame.nr_subbands
49        return -1
50
51    if actual_frame.bitpool != expected_frame.bitpool:
52        print "bitpool wrong (E: %d, D: %d)" % (actual_frame.bitpool, expected_frame.bitpool)
53        return -1
54
55    return 0
56
57file_size = 0
58def get_actual_frame(fin, implementation, frame_count):
59    global file_size
60    actual_frame = SBCFrame()
61    sbc_unpack_frame(fin, file_size - fin.tell(), actual_frame)
62    sbc_reconstruct_subband_samples(actual_frame)
63    if subband_frame_count == 0:
64        sbc_init_sythesis(actual_frame.nr_subbands, implementation)
65        print actual_frame
66    sbc_synthesis(actual_frame, implementation)
67    return actual_frame
68
69def get_expected_frame(fin_expected, nr_blocks, nr_subbands, nr_channels, sampling_frequency, bitpool, allocation_method):
70    expected_frame = SBCFrame(nr_blocks, nr_subbands, nr_channels, sampling_frequency, bitpool, allocation_method)
71    fetch_samples_for_next_sbc_frame(fin_expected, expected_frame)
72    calculate_channel_mode_and_scale_factors(expected_frame, 0)
73    return expected_frame
74
75usage = '''
76Usage:      ./sbc_decoder_test.py decoder_input.sbc force_channel_mode[No=0, Stereo=2, Joint Stereo=3] implementation[SIG, V1] decoder_expected_output.wav
77Example:    ./sbc_decoder_test.py fanfare-4sb.sbc 0 fanfare-4sb-decoded.wav
78'''
79
80if (len(sys.argv) < 5):
81    print(usage)
82    sys.exit(1)
83try:
84    decoder_input_sbc = sys.argv[1]
85    force_channel_mode = int(sys.argv[2])
86    implementation = sys.argv[3]
87    decoder_expected_wav = sys.argv[4]
88
89    if not decoder_input_sbc.endswith('.sbc'):
90        print(usage)
91        sys.exit(1)
92
93    if not decoder_expected_wav.endswith('.wav'):
94        print(usage)
95        sys.exit(1)
96
97
98
99    fin_expected = wave.open(decoder_expected_wav, 'rb')
100    nr_channels, sampwidth, sampling_frequency, nr_audio_frames, comptype, compname =  fin_expected.getparams()
101
102    with open(decoder_input_sbc, 'rb') as fin:
103        try:
104            subband_frame_count = 0
105            fin.seek(0,2)
106            file_size = fin.tell()
107            fin.seek(0,0)
108
109            while True:
110                if subband_frame_count % 200 == 0:
111                    print ("== Frame %d ==" % subband_frame_count)
112
113
114                actual_frame = get_actual_frame(fin, implementation, subband_frame_count)
115
116                expected_frame = get_expected_frame(fin_expected, actual_frame.nr_blocks,
117                                                actual_frame.nr_subbands, nr_channels,
118                                                actual_frame.bitpool, sampling_frequency,
119                                                actual_frame.allocation_method)
120
121                err = sbc_compare_headers(subband_frame_count, actual_frame, expected_frame)
122
123                if err < 0:
124                    print ("Frame %d: Headers differ \n%s\n%s" % (subband_frame_count, actual_frame, expected_frame))
125                    sys.exit(1)
126
127                err = sbc_compare_pcm(subband_frame_count, actual_frame, expected_frame)
128                if err < 0:
129                    print ("Frame %d: PCMs differ %f \n%s\n%s" % (subband_frame_count, max_error, actual_frame.pcm, expected_frame.pcm))
130                    sys.exit(1)
131
132
133                subband_frame_count += 1
134
135        except TypeError:
136            fin_expected.close()
137            fin.close()
138            print ("DONE, max MSE PCM error %f" % max_error)
139
140except IOError as e:
141    print(usage)
142    sys.exit(1)
143
144
145
146
147
148