FreeCalypso > hg > gsm-codec-lib
view amrtest/decode-r.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 | e2f824ffd08a |
children |
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/* * twamr-decode-r is a speech decoder utility going from *.amr input * to "robe" (raw BE) output. */ #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include "../libtwamr/tw_amr.h" #include "../libtest/robewrite.h" main(argc, argv) char **argv; { FILE *inf, *outf; uint8_t frm_in[AMR_IETF_MAX_PL]; struct amr_decoder_state *state; struct amr_param_frame frame; int16_t pcm[160]; int rc; if (argc != 3) { fprintf(stderr, "usage: %s input.amr output.robe\n", argv[0]); exit(1); } inf = fopen(argv[1], "r"); if (!inf) { perror(argv[1]); exit(1); } if (fread(frm_in, 1, AMR_IETF_HDR_LEN, inf) != AMR_IETF_HDR_LEN || bcmp(frm_in, amr_file_header_magic, AMR_IETF_HDR_LEN)) { fprintf(stderr, "error: %s is not in IETF AMR format\n", argv[1]); exit(1); } outf = fopen(argv[2], "w"); if (!outf) { perror(argv[2]); exit(1); } state = amr_decoder_create(); if (!state) { perror("amr_decoder_create()"); exit(1); } for (;;) { rc = getc(inf); if (rc < 0) break; frm_in[0] = rc; rc = amr_ietf_grok_first_octet(frm_in[0]); if (rc < 0) { inv: fprintf(stderr, "error: %s contains invalid AMR data\n", argv[1]); exit(1); } if (rc && fread(frm_in+1, 1, rc, inf) != rc) goto inv; amr_frame_from_ietf(frm_in, &frame); amr_decode_frame(state, &frame, pcm); write_pcm_to_robe(outf, pcm); } fclose(outf); exit(0); }