annotate amrconv/if1_unpack.c @ 287:f00925b533b7

gsmfr-encode: convert to libgsmfr2
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Apr 2024 06:16:47 +0000
parents 934cf92a1c45
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
214
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 * In this module we implement our function for unpacking bits from AMR IF1
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 * and reshuffling them into the codec's natural bit order.
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 */
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 #include <stdint.h>
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 #include "amr_defs.h"
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 extern const uint8_t amr_475_bit_order[95];
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 extern const uint8_t amr_515_bit_order[103];
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 extern const uint8_t amr_59_bit_order[118];
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 extern const uint8_t amr_67_bit_order[134];
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 extern const uint8_t amr_74_bit_order[148];
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 extern const uint8_t amr_795_bit_order[159];
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 extern const uint8_t amr_102_bit_order[204];
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 extern const uint8_t amr_122_bit_order[244];
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 static void
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 unpack_bits(if1_bytes, codec_bits, nbits, table)
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 uint8_t *if1_bytes, *codec_bits;
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21 unsigned nbits;
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22 const uint8_t *table;
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
23 {
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
24 unsigned n, nb;
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
25
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
26 for (n = 0; n < nbits; n++) {
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
27 if (table)
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28 nb = table[n];
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
29 else
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
30 nb = n;
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
31 codec_bits[nb] = msb_get_bit(if1_bytes, n);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
32 }
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
33 }
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
34
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
35 amr_if1_unpack(if1_bytes, codec_bits, mode)
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
36 uint8_t *if1_bytes, *codec_bits;
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
37 unsigned mode;
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
38 {
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
39 switch (mode) {
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
40 case MR475:
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
41 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_475,
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
42 amr_475_bit_order);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
43 return(0);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
44 case MR515:
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
45 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_515,
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
46 amr_515_bit_order);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
47 return(0);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
48 case MR59:
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
49 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_59,
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
50 amr_59_bit_order);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
51 return(0);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
52 case MR67:
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
53 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_67,
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
54 amr_67_bit_order);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
55 return(0);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
56 case MR74:
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
57 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_74,
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
58 amr_74_bit_order);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
59 return(0);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
60 case MR795:
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
61 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_795,
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
62 amr_795_bit_order);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
63 return(0);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
64 case MR102:
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
65 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_102,
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
66 amr_102_bit_order);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
67 return(0);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
68 case MR122:
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
69 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_122,
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
70 amr_122_bit_order);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
71 return(0);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
72 case MRDTX:
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
73 unpack_bits(if1_bytes, codec_bits, AMR_NBITS_SID,
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
74 (const uint8_t *) 0);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
75 return(0);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
76 default:
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
77 return(-1);
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
78 }
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
79 }