FreeCalypso > hg > gsm-codec-lib
annotate amrconv/efr2amr.c @ 242:f081a6850fb5
libgsmfrp: new refined implementation
The previous implementation exhibited the following defects,
which are now fixed:
1) The last received valid SID was cached forever for the purpose of
handling future invalid SIDs - we could have received some valid
SID ages ago, then lots of speech or NO_DATA, and if we then get
an invalid SID, we would resurrect the last valid SID from ancient
history - a bad design. In our new design, we handle invalid SID
based on the current state, much like BFI.
2) GSM 06.11 spec says clearly that after the second lost SID
(received BFI=1 && TAF=1 in CN state) we need to gradually decrease
the output level, rather than jump directly to emitting silence
frames - we previously failed to implement such logic.
3) Per GSM 06.12 section 5.2, Xmaxc should be the same in all 4 subframes
in a SID frame. What should we do if we receive an otherwise valid
SID frame with different Xmaxc? Our previous approach would
replicate this Xmaxc oddity in every subsequent generated CN frame,
which is rather bad. In our new design, the very first CN frame
(which can be seen as a transformation of the SID frame itself)
retains the original 4 distinct Xmaxc, but all subsequent CN frames
are based on the Xmaxc from the last subframe of the most recent SID.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Tue, 09 May 2023 05:16:31 +0000 |
parents | b092a510141e |
children |
rev | line source |
---|---|
103
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
1 /* |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
2 * Our gsm-efr2amr utility reads in an EFR speech recording in our |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
3 * extended-libgsm file format and converts it to AMR, inserting |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
4 * an AMR NO_DATA frame in the place of every BFI in the input |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
5 * but NOT performing any special handling or even detection of |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
6 * EFR SID frames. |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
7 */ |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
8 |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
9 #include <stdio.h> |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
10 #include <stdint.h> |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
11 #include <stdlib.h> |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
12 #include <string.h> |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
13 #include <strings.h> |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
14 #include "../libtest/binreader.h" |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
15 |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
16 extern const uint8_t amr_122_bit_order[244]; |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
17 |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
18 static const char amr_file_hdr[] = "#!AMR\n"; |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
19 |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
20 main(argc, argv) |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
21 char **argv; |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
22 { |
106
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
23 char *infname, *outfname; |
103
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
24 FILE *inf, *outf; |
106
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
25 int wrong_flag; |
103
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
26 uint8_t frm_in[BINFILE_MAX_FRAME], frm_out[32]; |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
27 unsigned bit_a, bit_n, outlen; |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
28 int rc, bfi; |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
29 |
106
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
30 if (argc == 3 && argv[1][0] != '-') { |
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
31 wrong_flag = 0; |
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
32 infname = argv[1]; |
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
33 outfname = argv[2]; |
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
34 } else if (argc == 4 && !strcmp(argv[1], "-w")) { |
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
35 wrong_flag = 1; |
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
36 infname = argv[2]; |
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
37 outfname = argv[3]; |
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
38 } else { |
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
39 fprintf(stderr, "usage: %s [-w] input.gsmx output.amr\n", |
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
40 argv[0]); |
103
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
41 exit(1); |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
42 } |
106
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
43 inf = fopen(infname, "r"); |
103
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
44 if (!inf) { |
106
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
45 perror(infname); |
103
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
46 exit(1); |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
47 } |
106
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
48 outf = fopen(outfname, "w"); |
103
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
49 if (!outf) { |
106
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
50 perror(outfname); |
103
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
51 exit(1); |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
52 } |
104
7f43089e9a7a
gsm-efr2amr: forgot AMR file header again
Mychaela Falconia <falcon@freecalypso.org>
parents:
103
diff
changeset
|
53 fwrite(amr_file_hdr, 1, 6, outf); |
103
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
54 for (;;) { |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
55 rc = binfile_read_frame(inf, frm_in); |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
56 if (rc < 0) { |
106
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
57 fprintf(stderr, "error: garbage in %s\n", infname); |
103
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
58 exit(1); |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
59 } |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
60 if (!rc) |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
61 break; |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
62 if (frm_in[0] == 0xBF) |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
63 bfi = 1; |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
64 else if ((frm_in[0] & 0xF0) == 0xC0) |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
65 bfi = 0; |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
66 else { |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
67 fprintf(stderr, |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
68 "error: %s is not in EFR codec format\n", |
106
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
69 infname); |
103
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
70 exit(1); |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
71 } |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
72 if (bfi) { |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
73 frm_out[0] = 0x78; |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
74 outlen = 1; |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
75 } else { |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
76 frm_out[0] = 0x3C; |
107
41f1ae68d253
amr2efr & efr2amr cosmetic: cleaner approach to bit reshuffling
Mychaela Falconia <falcon@freecalypso.org>
parents:
106
diff
changeset
|
77 frm_out[31] = 0; |
103
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
78 for (bit_a = 0; bit_a < 244; bit_a++) { |
106
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
79 if (wrong_flag) |
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
80 bit_n = bit_a; |
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
81 else |
e7c8d739c4c8
gsm-efr2amr: implement -w option like in gsm-amr2efr
Mychaela Falconia <falcon@freecalypso.org>
parents:
104
diff
changeset
|
82 bit_n = amr_122_bit_order[bit_a]; |
103
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
83 msb_set_bit(frm_out + 1, bit_a, |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
84 msb_get_bit(frm_in, 4 + bit_n)); |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
85 } |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
86 outlen = 32; |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
87 } |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
88 fwrite(frm_out, 1, outlen, outf); |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
89 } |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
90 fclose(outf); |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
91 exit(0); |
0123ca1f1402
gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
92 } |