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comparison efrtest/dlcap-gsmx.c @ 163:3bbb16015a79

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gsmefr-dlcap-gsmx: logic change for updated understanding of DSP flags
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 16 Dec 2022 02:21:41 +0000
parents 5efc377326da
children 6e39fc0134da
comparison
equal deleted inserted replaced
162:b98aebd94d1f 163:3bbb16015a79
1 /* 1 /*
2 * This program reads a TCH/EFS downlink capture produced with FreeCalypso tools 2 * This program reads a TCH/EFS downlink capture produced with FreeCalypso tools
3 * (fw version with TCH downlink sniffing feature and fc-shell tch record) 3 * (fw version with TCH downlink sniffing feature and fc-shell tch record)
4 * and converts it into our extended-libgsm binary format, to be further 4 * and converts it into our extended-libgsm binary format, to be further
5 * fed to gsmefr-decode. 5 * fed to gsmefr-decode or other tools.
6 */ 6 */
7 7
8 #include <ctype.h> 8 #include <ctype.h>
9 #include <stdio.h> 9 #include <stdio.h>
10 #include <stdint.h> 10 #include <stdint.h>
60 goto invalid; 60 goto invalid;
61 fn_mod_104 = strtoul(linebuf + 86, 0, 10); 61 fn_mod_104 = strtoul(linebuf + 86, 0, 10);
62 } else 62 } else
63 goto invalid; 63 goto invalid;
64 /* 64 /*
65 * Bit 15 of status word 0 is buffer validity flag, 65 * DSP flags will be documented in ../doc/Calypso-TCH-downlink
66 * bit 2 is BFI.
67 */ 66 */
68 if (!(status_words[0] & 0x8000) || (status_words[0] & 0x0004)) { 67 if ((status_words[0] & 0xC204) == 0xC000) {
68 efr_tidsp_to_std(tidsp_bytes, efr_bytes);
69 fwrite(efr_bytes, 1, 31, outf);
70 } else {
69 bfi[0] = 0xBF; 71 bfi[0] = 0xBF;
70 bfi[1] = fn_mod_104 == 60; 72 bfi[1] = fn_mod_104 == 60;
71 fwrite(bfi, 1, 2, outf); 73 fwrite(bfi, 1, 2, outf);
72 } else {
73 efr_tidsp_to_std(tidsp_bytes, efr_bytes);
74 fwrite(efr_bytes, 1, 31, outf);
75 } 74 }
76 } 75 }
77 exit(0); 76 exit(0);
78 } 77 }