FreeCalypso > hg > gsm-codec-lib
view dev/gsmfr-dhf.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 | 37dc5c84bbe9 |
children |
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/* * This program is meant to be run only once by the developer - it * generates RTP-packed form of the decoder homing frame for GSM-FR, * as specified in more recent versions of GSM 06.10 spec. */ #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> extern void gsmfr_pack_to_rtp(const int16_t *params, uint8_t *frame); static const int16_t larc[8] = {9, 23, 15, 8, 7, 3, 3, 2}; main(argc, argv) char **argv; { int16_t params[76], *pp; uint8_t frame[33]; unsigned m, n; /* gather params */ bcopy(larc, params, sizeof(int16_t) * 8); pp = params + 8; for (m = 0; m < 4; m++) { *pp++ = 40; *pp++ = 0; *pp++ = 0; *pp++ = 0; for (n = 0; n < 13; n++) { if (m == 3 && n == 4) *pp++ = 3; else *pp++ = 4; } } /* generate frame */ gsmfr_pack_to_rtp(params, frame); /* print the frame */ for (n = 0; n < 33; n++) { printf("0x%02X,", frame[n]); if (n == 4 || n == 11 || n == 18 || n == 25 || n == 32) putchar('\n'); else putchar(' '); } exit(0); }