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view tchtools/fc-vm2gsmx.c @ 948:d16222179c67
doc/Rvinterf-tools: document rvinterf -v changes
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 06 Jun 2023 23:17:10 +0000 |
parents | 546bf873ccc8 |
children |
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/* * This utility converts old-fashioned (non-AMR) TCS211 voice memo files * read out of FFS into Themyscira Wireless gsmx (extended-libgsm) format, * allowing further decoding into playable speech with gsmfr-decode. */ #include <sys/types.h> #include <stdio.h> #include <stdlib.h> static char *infname; static FILE *inf, *outf; static u_long file_offset; static const u_char bfi_marker[2] = {0xBF, 0x00}; static unsigned get_word() { u_char b[2]; int i, c; for (i = 0; i < 2; i++) { c = getc(inf); if (c < 0) { fprintf(stderr, "error: premature EOF in %s\n", infname); exit(1); } b[i] = c; file_offset++; } return((b[1] << 8) | b[0]); } static void read_dsp_bytes(bytes) u_char *bytes; { int i, dp; unsigned word; dp = 0; for (i = 0; i < 17; i++) { word = get_word(); bytes[dp++] = word >> 8; bytes[dp++] = word; } } static void convert_speech_sample() { u_char tidsp_bytes[34], libgsm_bytes[33]; read_dsp_bytes(tidsp_bytes); gsm0610_tidsp_to_libgsm(tidsp_bytes, libgsm_bytes); fwrite(libgsm_bytes, 1, 33, outf); } main(argc, argv) char **argv; { unsigned first_word; if (argc != 3) { fprintf(stderr, "usage: %s infile outfile\n", argv[0]); exit(1); } infname = argv[1]; inf = fopen(infname, "r"); if (!inf) { perror(infname); exit(1); } outf = fopen(argv[2], "w"); if (!outf) { perror(argv[2]); exit(1); } for (;;) { first_word = get_word(); if (first_word == 0xFBFF) /* SC_VM_END_MASK */ break; if ((first_word & 0xB7FF) == 0x8400) { /* skip dummy header words 1 and 2 */ get_word(); get_word(); /* process the actual speech or SID frame */ convert_speech_sample(); } else if (first_word == 0x0400) { /* it's a skipped frame, aka BFI */ fwrite(bfi_marker, 1, 2, outf); } else { fprintf(stderr, "error in %s at offset 0x%lx: invalid frame header word 0x%04X\n", infname, file_offset, first_word); exit(1); } } fclose(outf); exit(0); }