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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | pmbaty | 1 | /** |
| 2 | libsmacker - A C library for decoding .smk Smacker Video files |
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| 3 | Copyright (C) 2012-2017 Greg Kennedy |
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| 4 | |||
| 5 | See smacker.h for more information. |
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| 6 | |||
| 7 | smk_bitstream.h |
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| 8 | SMK bitstream structure. Presents a block of raw bytes one |
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| 9 | bit at a time, and protects against over-read. |
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| 10 | */ |
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| 11 | |||
| 12 | #ifndef SMK_BITSTREAM_H |
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| 13 | #define SMK_BITSTREAM_H |
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| 14 | |||
| 15 | /** Bitstream structure, Forward declaration */ |
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| 16 | struct smk_bit_t; |
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| 17 | |||
| 18 | /* BITSTREAM Functions */ |
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| 19 | /** Initialize a bitstream */ |
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| 20 | struct smk_bit_t* smk_bs_init(const unsigned char* b, unsigned long size); |
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| 21 | |||
| 22 | /** This macro checks return code from _smk_bs_read_1 and |
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| 23 | jumps to error label if problems occur. */ |
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| 24 | #define smk_bs_read_1(t,uc) \ |
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| 25 | { \ |
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| 26 | if ((char)(uc = _smk_bs_read_1(t)) < 0) \ |
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| 27 | { \ |
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| 28 | fprintf(stderr, "libsmacker::smk_bs_read_1(" #t ", " #uc ") - ERROR (file: %s, line: %lu)\n", __FILE__, (unsigned long)__LINE__); \ |
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| 29 | goto error; \ |
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| 30 | } \ |
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| 31 | } |
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| 32 | /** Read a single bit from the bitstream, and advance. |
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| 33 | Returns -1 on error. */ |
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| 34 | char _smk_bs_read_1(struct smk_bit_t* bs); |
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| 35 | |||
| 36 | /** This macro checks return code from _smk_bs_read_8 and |
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| 37 | jumps to error label if problems occur. */ |
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| 38 | #define smk_bs_read_8(t,s) \ |
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| 39 | { \ |
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| 40 | if ((short)(s = _smk_bs_read_8(t)) < 0) \ |
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| 41 | { \ |
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| 42 | fprintf(stderr, "libsmacker::smk_bs_read_8(" #t ", " #s ") - ERROR (file: %s, line: %lu)\n", __FILE__, (unsigned long)__LINE__); \ |
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| 43 | goto error; \ |
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| 44 | } \ |
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| 45 | } |
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| 46 | /** Read eight bits from the bitstream (one byte), and advance. |
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| 47 | Returns -1 on error. */ |
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| 48 | short _smk_bs_read_8(struct smk_bit_t* bs); |
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| 49 | |||
| 50 | #endif |