FreeCalypso > hg > gsm-codec-lib
view libgsmfr2/unpack_frame2.c @ 302:f469bad44c0e
doc/Binary-file-format: s/gsm_explode/gsmfr_unpack_to_array/
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 15 Apr 2024 18:45:08 +0000 |
parents | cfcb3ce9c778 |
children |
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/* * This module holds our gsmfr_unpack_to_array() function: a drop-in * replacement for gsm_explode() from classic libgsm. */ #include <stdint.h> #include "tw_gsmfr.h" void gsmfr_unpack_to_array(const uint8_t *frame, int16_t *params) { const uint8_t *c = frame; unsigned sub; params[0] = (*c++ & 0xF) << 2; params[0] |= (*c >> 6) & 0x3; params[1] = *c++ & 0x3F; params[2] = (*c >> 3) & 0x1F; params[3] = (*c++ & 0x7) << 2; params[3] |= (*c >> 6) & 0x3; params[4] = (*c >> 2) & 0xF; params[5] = (*c++ & 0x3) << 2; params[5] |= (*c >> 6) & 0x3; params[6] = (*c >> 3) & 0x7; params[7] = *c++ & 0x7; params += 8; for (sub = 0; sub < 4; sub++) { params[0] = (*c >> 1) & 0x7F; params[1] = (*c++ & 0x1) << 1; params[1] |= (*c >> 7) & 0x1; params[2] = (*c >> 5) & 0x3; params[3] = (*c++ & 0x1F) << 1; params[3] |= (*c >> 7) & 0x1; params[4] = (*c >> 4) & 0x7; params[5] = (*c >> 1) & 0x7; params[6] = (*c++ & 0x1) << 2; params[6] |= (*c >> 6) & 0x3; params[7] = (*c >> 3) & 0x7; params[8] = *c++ & 0x7; params[9] = (*c >> 5) & 0x7; params[10] = (*c >> 2) & 0x7; params[11] = (*c++ & 0x3) << 1; params[11] |= (*c >> 7) & 0x1; params[12] = (*c >> 4) & 0x7; params[13] = (*c >> 1) & 0x7; params[14] = (*c++ & 0x1) << 2; params[14] |= (*c >> 6) & 0x3; params[15] = (*c >> 3) & 0x7; params[16] = *c++ & 0x7; params += 17; } }