FreeCalypso > hg > gsm-codec-lib
view amrconv/if1_unpack.c @ 467:ad032051166a
doc: AMR-EFR-hybrid-emu new article
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 12 May 2024 23:54:43 +0000 |
parents | 934cf92a1c45 |
children |
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/* * In this module we implement our function for unpacking bits from AMR IF1 * and reshuffling them into the codec's natural bit order. */ #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 unpack_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; codec_bits[nb] = msb_get_bit(if1_bytes, n); } } amr_if1_unpack(if1_bytes, codec_bits, mode) uint8_t *if1_bytes, *codec_bits; unsigned mode; { switch (mode) { case MR475: unpack_bits(if1_bytes, codec_bits, AMR_NBITS_475, amr_475_bit_order); return(0); case MR515: unpack_bits(if1_bytes, codec_bits, AMR_NBITS_515, amr_515_bit_order); return(0); case MR59: unpack_bits(if1_bytes, codec_bits, AMR_NBITS_59, amr_59_bit_order); return(0); case MR67: unpack_bits(if1_bytes, codec_bits, AMR_NBITS_67, amr_67_bit_order); return(0); case MR74: unpack_bits(if1_bytes, codec_bits, AMR_NBITS_74, amr_74_bit_order); return(0); case MR795: unpack_bits(if1_bytes, codec_bits, AMR_NBITS_795, amr_795_bit_order); return(0); case MR102: unpack_bits(if1_bytes, codec_bits, AMR_NBITS_102, amr_102_bit_order); return(0); case MR122: unpack_bits(if1_bytes, codec_bits, AMR_NBITS_122, amr_122_bit_order); return(0); case MRDTX: unpack_bits(if1_bytes, codec_bits, AMR_NBITS_SID, (const uint8_t *) 0); return(0); default: return(-1); } }