FreeCalypso > hg > gsm-codec-lib
view amrconv/efr2amr.c @ 247:56d3fbacd115
dev: new program xmaxc-tables
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 12 May 2023 02:04:42 +0000 |
parents | b092a510141e |
children |
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/* * Our gsm-efr2amr utility reads in an EFR speech recording in our * extended-libgsm file format and converts it to AMR, inserting * an AMR NO_DATA frame in the place of every BFI in the input * but NOT performing any special handling or even detection of * EFR SID frames. */ #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include "../libtest/binreader.h" extern const uint8_t amr_122_bit_order[244]; static const char amr_file_hdr[] = "#!AMR\n"; main(argc, argv) char **argv; { char *infname, *outfname; FILE *inf, *outf; int wrong_flag; uint8_t frm_in[BINFILE_MAX_FRAME], frm_out[32]; unsigned bit_a, bit_n, outlen; int rc, bfi; if (argc == 3 && argv[1][0] != '-') { wrong_flag = 0; infname = argv[1]; outfname = argv[2]; } else if (argc == 4 && !strcmp(argv[1], "-w")) { wrong_flag = 1; infname = argv[2]; outfname = argv[3]; } else { fprintf(stderr, "usage: %s [-w] input.gsmx output.amr\n", argv[0]); exit(1); } inf = fopen(infname, "r"); if (!inf) { perror(infname); exit(1); } outf = fopen(outfname, "w"); if (!outf) { perror(outfname); exit(1); } fwrite(amr_file_hdr, 1, 6, outf); for (;;) { rc = binfile_read_frame(inf, frm_in); if (rc < 0) { fprintf(stderr, "error: garbage in %s\n", infname); exit(1); } if (!rc) break; if (frm_in[0] == 0xBF) bfi = 1; else if ((frm_in[0] & 0xF0) == 0xC0) bfi = 0; else { fprintf(stderr, "error: %s is not in EFR codec format\n", infname); exit(1); } if (bfi) { frm_out[0] = 0x78; outlen = 1; } else { frm_out[0] = 0x3C; frm_out[31] = 0; for (bit_a = 0; bit_a < 244; bit_a++) { if (wrong_flag) bit_n = bit_a; else bit_n = amr_122_bit_order[bit_a]; msb_set_bit(frm_out + 1, bit_a, msb_get_bit(frm_in, 4 + bit_n)); } outlen = 32; } fwrite(frm_out, 1, outlen, outf); } fclose(outf); exit(0); }