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49 lines
1.7 KiB
49 lines
1.7 KiB
/*
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ircDDB-mheard
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Copyright (C) 2010 Michael Dirska, DL1BFF (dl1bff@mdx.de)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Call this function first before using any of the other functions */
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void dstar_dv_init(void);
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/*
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This function decodes the first and most important Golay block
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of a DSTAR Digital Voice frame. The function is provided with a
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pointer to the 9-byte voice data. Result is the decoded
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first block. The number of decoding errors is reported in the
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variable errs and ranges from 0 to 4. Only 24 bits are
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checked, the BER therefore is: BER = errs / 24
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*/
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int dstar_dv_decode_first_block (const unsigned char * d, int * errs);
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/*
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This function decodes the both Golay blocks
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of a DSTAR Digital Voice frame. The function is provided with a
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pointer to the 9-byte voice data. Function result is
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the number of decoding errors (0 to 8). Only 48 bits are
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checked, the BER therefore is: BER = errs / 48
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The return value data[0] contains the first decoded golay block
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(12 bits). The return value data[1] contains the second decoded
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golay block (12 bits). The return value data[2] contains the
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unprotected rest of the frame (24 bits).
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*/
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int dstar_dv_decode (const unsigned char * d, int data[3]);
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