FreeCalypso > hg > gsm-codec-lib
view amrconv/cod2ietf.c @ 260:f0220c141d2c
libgsmfr2: implement gsmfr_unpack_frame()
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 12 Apr 2024 23:09:23 +0000 |
parents | 4c4649a5fec3 |
children |
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/* * This program converts an AMR-encoded speech recording from the .cod * format used by 3GPP test sequences into the more common .amr format * of IETF RFC 4867. */ #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include "amr_defs.h" extern unsigned amr_bit_lengths[9]; extern const char amr_file_hdr[IETF_HDR_LEN]; extern const uint8_t extra_bytes_per_ft[9]; main(argc, argv) char **argv; { char *infname, *outfname; FILE *inf, *outf; int big_endian; unsigned frame_no, type, mode, outlen; uint8_t input_bits[COD_FORMAT_NWORDS], frm_out[MAX_IF1_BYTES+1]; int rc; if (argc == 3 && argv[1][0] != '-') { big_endian = 0; infname = argv[1]; outfname = argv[2]; } else if (argc == 4 && !strcmp(argv[1], "-b")) { big_endian = 1; infname = argv[2]; outfname = argv[3]; } else { fprintf(stderr, "usage: %s [-b] input.cod 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, IETF_HDR_LEN, outf); for (frame_no = 0; ; frame_no++) { rc = read_cod_bits(inf, big_endian, input_bits, infname); if (!rc) break; type = input_bits[0]; mode = input_bits[245]; switch (type) { case TX_SPEECH_GOOD: if (mode > MR122) { invalid_mode: fprintf(stderr, "error in %s frame #%u: invalid mode\n", infname, frame_no); exit(1); } preen_frame_bits(input_bits+1, amr_bit_lengths[mode], infname, frame_no); frm_out[0] = (mode << 3) | 0x04; amr_if1_pack(frm_out+1, input_bits+1, mode); outlen = extra_bytes_per_ft[mode] + 1; break; case TX_SID_FIRST: case TX_SID_UPDATE: if (mode > MR122) goto invalid_mode; preen_frame_bits(input_bits+1, AMR_NBITS_SID, infname, frame_no); frm_out[0] = 0x44; amr_if1_pack(frm_out+1, input_bits+1, MRDTX); if (type == TX_SID_UPDATE) frm_out[5] |= 0x10; if (mode & 1) frm_out[5] |= 0x08; if (mode & 2) frm_out[5] |= 0x04; if (mode & 4) frm_out[5] |= 0x02; outlen = 6; break; case TX_NO_DATA: frm_out[0] = 0x7C; outlen = 1; break; default: fprintf(stderr, "error in %s frame #%u: invalid type\n", infname, frame_no); exit(1); } fwrite(frm_out, 1, outlen, outf); } fclose(outf); exit(0); }