FreeCalypso > hg > gsm-codec-lib
view miscutil/pcm16-check13.c @ 494:aaf4dec8bee0
libgsmhr1: implement perfect SID detection
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 17 Jun 2024 23:14:19 +0000 |
parents | 6555dae764b3 |
children |
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/* * This program reads a 16-bit PCM recording in raw format (robe by default, * or LE with -l option) and checks whether or not every sample fits into * left-justified 13 bits, with the 3 least significant bits of every 16-bit * sample cleared. */ #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> main(argc, argv) char **argv; { int little_endian; char *infname; FILE *inf; unsigned sample_count; uint8_t inb[2]; uint16_t ins, lowbits; int cc; if (argc == 2 && argv[1][0] != '-') { little_endian = 0; infname = argv[1]; } else if (argc == 3 && !strcmp(argv[1], "-l")) { little_endian = 1; infname = argv[2]; } else { fprintf(stderr, "usage: %s [-l] input.pcm16\n", argv[0]); exit(1); } inf = fopen(infname, "r"); if (!inf) { perror(infname); exit(1); } for (sample_count = 0; ; sample_count++) { cc = fread(inb, 1, 2, inf); if (cc <= 0) break; if (cc & 1) { fprintf(stderr, "error: %s has odd number of bytes\n", infname); exit(1); } if (little_endian) ins = ((uint16_t) inb[1] << 8) | ((uint16_t) inb[0]); else ins = ((uint16_t) inb[0] << 8) | ((uint16_t) inb[1]); lowbits = ins & 7; if (lowbits) { fprintf(stderr, "check13 fail: %s sample #%u low 3 bits are %u\n", infname, sample_count, lowbits); exit(1); } } exit(0); }