FreeCalypso > hg > gsm-codec-lib
changeset 260:f0220c141d2c
libgsmfr2: implement gsmfr_unpack_frame()
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Fri, 12 Apr 2024 23:09:23 +0000 |
| parents | bebae251e5ee |
| children | cfcb3ce9c778 |
| files | libgsmfr2/Makefile libgsmfr2/unpack_frame.c |
| diffstat | 2 files changed, 50 insertions(+), 1 deletions(-) [+] |
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--- a/libgsmfr2/Makefile Fri Apr 12 22:48:50 2024 +0000 +++ b/libgsmfr2/Makefile Fri Apr 12 23:09:23 2024 +0000 @@ -1,7 +1,7 @@ CC= gcc CFLAGS= -O2 OBJS= comfort_noise.o pack_frame.o pack_frame2.o pp_bad.o pp_good.o \ - pp_state.o prng.o sidclass.o silence_frame.o xmaxc_mean.o + pp_state.o prng.o sidclass.o silence_frame.o unpack_frame.o xmaxc_mean.o HDRS= pp_internal.h tw_gsmfr.h LIB= libgsmfr2.a
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libgsmfr2/unpack_frame.c Fri Apr 12 23:09:23 2024 +0000 @@ -0,0 +1,49 @@ +/* + * This module holds our gsmfr_unpack_frame() function: unpacking a single + * GSM-FR frame from libgsm/RTP format into a broken-down struct of params. + */ + +#include <stdint.h> +#include "tw_gsmfr.h" + +void gsmfr_unpack_frame(const uint8_t *frame, struct gsmfr_param_frame *param) +{ + const uint8_t *c = frame; + unsigned sub; + + param->LARc[0] = (*c++ & 0xF) << 2; + param->LARc[0] |= (*c >> 6) & 0x3; + param->LARc[1] = *c++ & 0x3F; + param->LARc[2] = (*c >> 3) & 0x1F; + param->LARc[3] = (*c++ & 0x7) << 2; + param->LARc[3] |= (*c >> 6) & 0x3; + param->LARc[4] = (*c >> 2) & 0xF; + param->LARc[5] = (*c++ & 0x3) << 2; + param->LARc[5] |= (*c >> 6) & 0x3; + param->LARc[6] = (*c >> 3) & 0x7; + param->LARc[7] = *c++ & 0x7; + for (sub = 0; sub < 4; sub++) { + param->Nc[sub] = (*c >> 1) & 0x7F; + param->bc[sub] = (*c++ & 0x1) << 1; + param->bc[sub] |= (*c >> 7) & 0x1; + param->Mc[sub] = (*c >> 5) & 0x3; + param->xmaxc[sub] = (*c++ & 0x1F) << 1; + param->xmaxc[sub] |= (*c >> 7) & 0x1; + param->xMc[sub][0] = (*c >> 4) & 0x7; + param->xMc[sub][1] = (*c >> 1) & 0x7; + param->xMc[sub][2] = (*c++ & 0x1) << 2; + param->xMc[sub][2] |= (*c >> 6) & 0x3; + param->xMc[sub][3] = (*c >> 3) & 0x7; + param->xMc[sub][4] = *c++ & 0x7; + param->xMc[sub][5] = (*c >> 5) & 0x7; + param->xMc[sub][6] = (*c >> 2) & 0x7; + param->xMc[sub][7] = (*c++ & 0x3) << 1; + param->xMc[sub][7] |= (*c >> 7) & 0x1; + param->xMc[sub][8] = (*c >> 4) & 0x7; + param->xMc[sub][9] = (*c >> 1) & 0x7; + param->xMc[sub][10] = (*c++ & 0x1) << 2; + param->xMc[sub][10] |= (*c >> 6) & 0x3; + param->xMc[sub][11] = (*c >> 3) & 0x7; + param->xMc[sub][12] = *c++ & 0x7; + } +}