FreeCalypso > hg > gsm-codec-lib
view amrtest/tseq-dec.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 | edbbbf1c4ab1 |
children |
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/* * twamr-tseq-dec is a test program for our AMR decoder: it reads * 3GPP AMR *.cod files as input and writes 16-bit linear PCM (raw) * files as output, allowing libtwamr decoder to be tested with the * official test sequences. * * Both input and output are read/written in the host machine's * native byte order. */ #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include <unistd.h> #include "../libtwamr/tw_amr.h" static int read_input(inf, cod, filename_for_errs) FILE *inf; uint16_t *cod; char *filename_for_errs; { int cc; cc = fread(cod, 2, AMR_COD_WORDS, inf); if (cc == 0) return 0; if (cc != AMR_COD_WORDS) { fprintf(stderr, "error: short read from %s\n", filename_for_errs); exit(1); } return 1; } main(argc, argv) char **argv; { char *infname, *outfname; FILE *inf, *outf; struct amr_decoder_state *state; uint16_t cod[AMR_COD_WORDS]; struct amr_param_frame frame; int16_t pcm[160]; int opt, use_rxtype = 0, rc; unsigned frame_no; extern int optind; while ((opt = getopt(argc, argv, "r")) != EOF) { switch (opt) { case 'r': use_rxtype = 1; continue; default: usage: fprintf(stderr, "usage: %s [-r] input.cod output.out\n", argv[0]); exit(1); } } if (argc != optind + 2) goto usage; infname = argv[optind]; outfname = argv[optind+1]; inf = fopen(infname, "r"); if (!inf) { perror(infname); exit(1); } outf = fopen(outfname, "w"); if (!outf) { perror(outfname); exit(1); } state = amr_decoder_create(); if (!state) { perror("amr_decoder_create()"); exit(1); } for (frame_no = 0; ; frame_no++) { rc = read_input(inf, cod, infname); if (!rc) break; rc = amr_frame_from_tseq(cod, use_rxtype, &frame); if (rc < 0) { fprintf(stderr, "error in %s frame %u: amr_frame_from_tseq() returned %d\n", infname, frame_no, rc); exit(1); } amr_decode_frame(state, &frame, pcm); fwrite(pcm, 2, 160, outf); } fclose(outf); exit(0); }