FreeCalypso > hg > gsm-codec-lib
view amrconv/if1_pack.c @ 482:5e2d849a4fbc
doc/Calypso-TCH-downlink: grammar fix
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 20 May 2024 01:24:22 +0000 |
parents | 4c4649a5fec3 |
children |
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/* * In this module we implement our function for packing AMR codec bits * from an array containing them in the codec's natural bit order * into the octet form of AMR IF1 and RFC 4867. */ #include <stdint.h> #include "amr_defs.h" extern const uint8_t amr_475_bit_order[95]; extern const uint8_t amr_515_bit_order[103]; extern const uint8_t amr_59_bit_order[118]; extern const uint8_t amr_67_bit_order[134]; extern const uint8_t amr_74_bit_order[148]; extern const uint8_t amr_795_bit_order[159]; extern const uint8_t amr_102_bit_order[204]; extern const uint8_t amr_122_bit_order[244]; static void pack_bits(if1_bytes, codec_bits, nbits, table) uint8_t *if1_bytes, *codec_bits; unsigned nbits; const uint8_t *table; { unsigned n, nb; for (n = 0; n < nbits; n++) { if (table) nb = table[n]; else nb = n; msb_set_bit(if1_bytes, n, codec_bits[nb]); } } amr_if1_pack(if1_bytes, codec_bits, mode) uint8_t *if1_bytes, *codec_bits; unsigned mode; { switch (mode) { case MR475: pack_bits(if1_bytes, codec_bits, AMR_NBITS_475, amr_475_bit_order); if1_bytes[11] &= 0xFE; return(0); case MR515: pack_bits(if1_bytes, codec_bits, AMR_NBITS_515, amr_515_bit_order); if1_bytes[12] &= 0xFE; return(0); case MR59: pack_bits(if1_bytes, codec_bits, AMR_NBITS_59, amr_59_bit_order); if1_bytes[14] &= 0xFC; return(0); case MR67: pack_bits(if1_bytes, codec_bits, AMR_NBITS_67, amr_67_bit_order); if1_bytes[16] &= 0xFC; return(0); case MR74: pack_bits(if1_bytes, codec_bits, AMR_NBITS_74, amr_74_bit_order); if1_bytes[18] &= 0xF0; return(0); case MR795: pack_bits(if1_bytes, codec_bits, AMR_NBITS_795, amr_795_bit_order); if1_bytes[19] &= 0xFE; return(0); case MR102: pack_bits(if1_bytes, codec_bits, AMR_NBITS_102, amr_102_bit_order); if1_bytes[25] &= 0xF0; return(0); case MR122: pack_bits(if1_bytes, codec_bits, AMR_NBITS_122, amr_122_bit_order); if1_bytes[30] &= 0xF0; return(0); case MRDTX: pack_bits(if1_bytes, codec_bits, AMR_NBITS_SID, (const uint8_t *) 0); if1_bytes[4] &= 0xE0; return(0); default: return(-1); } }