FreeCalypso > hg > gsm-codec-lib
view frtest/hand-test.c @ 183:452c1d5a6268
libgsmefr BFI w/o data: emit zero output after decoder reset
In real-life usage, each EFR decoder session will most likely begin
with lots of BFI frames before the first real frame arrives. However,
because the spec-defined home state of the decoder is speech rather
than CN, our regular logic for BFI w/o data would have to feed
pseudorandom noise to the decoder (in the "fixed codebook excitation
pulses" part), which is silly to do at the beginning of the decoder
session right out of reset. Therefore, let's check reset_flag_old,
and if we are still in the reset state, simply emit zero output.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Tue, 03 Jan 2023 00:12:18 +0000 |
parents | d21c68b8f16c |
children |
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line source
/* * This program is a debug aid that allows a developer to hand-craft input * to the GSM 06.10 decoder (libgsm) and see what output magnitude it results * in, in the style of gsmfr-max-out. This program reads input from an * ASCII text file in the same format as gsmrec-dump, performs gsm_implode() * and gsm_decode() operations and reports maximum output magnitude for * each processed frame. */ #include <ctype.h> #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include <gsm.h> static char *infname; static FILE *inf; static char linebuf[256]; static int lineno; static get_line() { if (!fgets(linebuf, sizeof linebuf, inf)) return 0; lineno++; if (!index(linebuf, '\n')) { fprintf(stderr, "%s line %d: too long or missing newline\n", infname, lineno); exit(1); } return 1; } static read_lar_params(params) gsm_signal *params; { char *cp; unsigned n; for (;;) { if (!get_line()) return 0; for (cp = linebuf; isspace(*cp); cp++) ; if (*cp) break; } if (*cp == '#') { cp++; if (!isdigit(*cp)) { inv_syntax: fprintf(stderr, "%s line %d: invalid syntax (expected LAR)\n", infname, lineno); exit(1); } while (isdigit(*cp)) cp++; if (*cp++ != ':') goto inv_syntax; while (isspace(*cp)) cp++; } if (cp[0] != 'F' || cp[1] != 'R' || !isspace(cp[2])) goto inv_syntax; cp += 3; for (n = 0; n < 8; n++) { while (isspace(*cp)) cp++; if (!isdigit(*cp)) goto inv_syntax; params[n] = strtoul(cp, &cp, 10); if (!isspace(*cp)) goto inv_syntax; } fputs(linebuf, stdout); return 1; } static void read_subframe_params(params) gsm_signal *params; { char *cp; unsigned n; for (;;) { if (!get_line()) { fprintf(stderr, "%s bad: EOF in the middle of a frame\n", infname); exit(1); } for (cp = linebuf; isspace(*cp); cp++) ; if (*cp) break; } for (n = 0; n < 17; n++) { while (isspace(*cp)) cp++; if (!isdigit(*cp)) { inv_syntax: fprintf(stderr, "%s line %d: invalid syntax (expected subframe)\n", infname, lineno); exit(1); } params[n] = strtoul(cp, &cp, 10); if (!isspace(*cp)) goto inv_syntax; } fputs(linebuf, stdout); } static read_frame(params) gsm_signal *params; { int rc; unsigned n, idx; rc = read_lar_params(params); if (!rc) return 0; idx = 8; for (n = 0; n < 4; n++) { read_subframe_params(params + idx); idx += 17; } return 1; } main(argc, argv) char **argv; { gsm dec_state; gsm_signal params[76]; uint8_t frame[33]; int16_t pcm[160]; int rc, i; unsigned samp_abs, samp_max; if (argc != 2) { fprintf(stderr, "usage: %s input-file\n", argv[0]); exit(1); } infname = argv[1]; inf = fopen(infname, "r"); if (!inf) { perror(infname); exit(1); } dec_state = gsm_create(); if (!dec_state) { fprintf(stderr, "gsm_create() failed!\n"); exit(1); } for (;;) { rc = read_frame(params); if (!rc) break; gsm_implode(dec_state, params, frame); gsm_decode(dec_state, frame, pcm); samp_max = 0; for (i = 0; i < 160; i++) { if (pcm[i] >= 0) samp_abs = pcm[i]; else samp_abs = -pcm[i]; if (samp_abs > samp_max) samp_max = samp_abs; } printf(" MAX=%u\n", samp_max); } exit(0); }