FreeCalypso > hg > gsm-codec-lib
view amrconv/cod-parse.c @ 477:4c9222d95647
libtwamr encoder: always emit frame->mode = mode;
In the original implementation of amr_encode_frame(), the 'mode' member
of the output struct was set to 0xFF if the output frame type is TX_NO_DATA.
This design was made to mimic the mode field (16-bit word) being set to
0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends
on this struct member being set in any way, and amr_frame_to_tseq()
generates the needed 0xFFFF on its own, based on frame->type being equal
to TX_NO_DATA.
It is simpler and more efficient to always set frame->mode to the actual
encoding mode in amr_encode_frame(), and this new behavior has already
been documented in doc/AMR-library-API description in anticipation of
the present change.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 18 May 2024 22:30:42 +0000 |
parents | 0beafaa0623f |
children |
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/* * This program reads an ETSI/3GPP AMR *.cod file and parses it into * a human-readable form. */ #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include "amr_defs.h" extern char *amr_mode_names[16]; extern unsigned amr_bit_lengths[9]; static char *type_names[4] = { "Speech", "SID_FIRST", "SID_UPDATE", "NO_DATA" }; main(argc, argv) char **argv; { char *infname; FILE *inf; int big_endian; unsigned frame_no, type, mode; uint8_t input_bits[COD_FORMAT_NWORDS]; uint16_t params[MAX_PRM_SIZE]; int rc; if (argc == 2 && argv[1][0] != '-') { big_endian = 0; infname = argv[1]; } else if (argc == 3 && !strcmp(argv[1], "-b")) { big_endian = 1; infname = argv[2]; } else { fprintf(stderr, "usage: %s [-b] file.cod\n", argv[0]); exit(1); } inf = fopen(infname, "r"); if (!inf) { perror(infname); exit(1); } 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]; printf("#%u: Type=%u Mode=%u", frame_no, type, mode); if (type == TX_NO_DATA) { printf(" (NO_DATA)\n"); continue; } if (type > TX_NO_DATA || mode > MR122) { printf(" (unsupported)\n"); continue; } printf(" (%s %s)\n", amr_mode_names[mode], type_names[type]); switch (type) { case TX_SPEECH_GOOD: preen_frame_bits(input_bits+1, amr_bit_lengths[mode], infname, frame_no); reassemble_amr_params(input_bits+1, params, mode); dump_amr_params(params, mode); break; case TX_SID_FIRST: case TX_SID_UPDATE: preen_frame_bits(input_bits+1, AMR_NBITS_SID, infname, frame_no); reassemble_amr_params(input_bits+1, params, MRDTX); dump_amr_params(params, MRDTX); break; } } exit(0); }