From 672b1796513e9e49fefb114f4fb77e83504c3d9d Mon Sep 17 00:00:00 2001 From: Piotr Krysik Date: Fri, 12 Jun 2009 12:25:10 +0200 Subject: added files for cch decoding, trying to make them compile --- src/lib/decoder/cch.h | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 src/lib/decoder/cch.h (limited to 'src/lib/decoder/cch.h') diff --git a/src/lib/decoder/cch.h b/src/lib/decoder/cch.h new file mode 100644 index 0000000..a642721 --- /dev/null +++ b/src/lib/decoder/cch.h @@ -0,0 +1,56 @@ +//TODO: this file shouldn't be part of the GSM Receiver +#ifndef __GSMSTACK_CCH_H__ +#define __GSMSTACK_CCH_H__ 1 + +#ifdef __cplusplus +extern "C" { +#endif + +#include "gsmstack.h" + +/* + * decode_cch + * + * Decode a "common" control channel. Most control channels use + * the same burst, interleave, Viterbi and parity configuration. + * The documentation for the control channels defines SACCH first + * and then just keeps referring to that. + * + * The current (investigated) list is as follows: + * + * BCCH Norm + * BCCH Ext + * PCH + * AGCH + * CBCH (SDCCH/4) + * CBCH (SDCCH/8) + * SDCCH/4 + * SACCH/C4 + * SDCCH/8 + * SACCH/C8 + * + * We provide two functions, one for where all four bursts are + * contiguous, and one where they aren't. + */ + +#define DATA_BLOCK_SIZE 184 +#define PARITY_SIZE 40 +#define FLUSH_BITS_SIZE 4 +#define PARITY_OUTPUT_SIZE (DATA_BLOCK_SIZE + PARITY_SIZE + FLUSH_BITS_SIZE) + +#define CONV_INPUT_SIZE PARITY_OUTPUT_SIZE +#define CONV_SIZE (2 * CONV_INPUT_SIZE) + +#define BLOCKS 4 +#define iBLOCK_SIZE (CONV_SIZE / BLOCKS) +#define eBLOCK_SIZE (iBLOCK_SIZE + 2) + +unsigned char *decode_cch(GS_CTX *ctx, unsigned char *burst, unsigned int *len); +//unsigned char *decode_cch(GS_CTX *ctx, unsigned char *, unsigned char *, unsigned char *, unsigned char *, unsigned int *len); +//unsigned char *decode_cch(GS_CTX *ctx, unsigned char *, unsigned int *); + +#ifdef __cplusplus +} +#endif + +#endif -- cgit v1.2.3