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author | Erik Walthinsen <omega@temple-baptist.org> | 2002-02-05 04:42:08 +0000 |
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committer | Erik Walthinsen <omega@temple-baptist.org> | 2002-02-05 04:42:08 +0000 |
commit | 6d87f6954d216aad9635dc98b145e6d3735d85a8 (patch) | |
tree | 9d815902b12c5268539c4e270afe36017451c5f0 | |
parent | 4b157fdec5db7a8f2cefffc6ad8b503f1268c5d4 (diff) | |
download | gstreamer-plugins-bad-6d87f6954d216aad9635dc98b145e6d3735d85a8.tar.gz |
added bitcoder.h from w3d CVS, needed to compile
Original commit message from CVS:
added bitcoder.h from w3d CVS, needed to compile
-rw-r--r-- | ext/tarkin/bitcoder.h | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/ext/tarkin/bitcoder.h b/ext/tarkin/bitcoder.h new file mode 100644 index 000000000..f0b8cd69b --- /dev/null +++ b/ext/tarkin/bitcoder.h @@ -0,0 +1,148 @@ +#ifndef __BITCODER_H +#define __BITCODER_H + +#include "mem.h" + +#if defined(BITCODER) + +#define OUTPUT_BIT(coder,bit) bitcoder_write_bit(coder,bit) +#define INPUT_BIT(coder) bitcoder_read_bit(coder) +#define OUTPUT_BIT_DIRECT(coder,bit) bitcoder_write_bit(coder,bit) +#define INPUT_BIT_DIRECT(coder) bitcoder_read_bit(coder) +#define ENTROPY_CODER BitCoderState +#define ENTROPY_ENCODER_init(coder,limit) bitcoder_coder_init(coder,limit) +#define ENTROPY_ENCODER_DONE(coder) bitcoder_encoder_done(coder) +#define ENTROPY_ENCODER_FLUSH(coder) bitcoder_flush(coder) +#define ENTROPY_DECODER_INIT(coder,bitstream,limit) \ + bitcoder_decoder_init(coder,bitstream,limit) +#define ENTROPY_DECODER_DONE(coder) /* nothing to do ... */ +#define ENTROPY_CODER_BITSTREAM(coder) (coder)->bitstream + +#define ENTROPY_CODER_SYMBOL(coder) 1 +#define ENTROPY_CODER_RUNLENGTH(coder) 0 +#define ENTROPY_CODER_SKIP(coder,skip) + +#endif + + +typedef struct { + int32_t bit_count; /* number of valid bits in byte */ + uint8_t byte; /* buffer to save bits */ + uint32_t byte_count; /* number of bytes written */ + uint8_t *bitstream; + uint32_t limit; /* don't write more bytes to bitstream ... */ + int eos; /* end of stream reached */ +} BitCoderState; + + + +static inline +void bitcoder_encoder_init (BitCoderState *s, uint32_t limit) +{ + s->bit_count = 0; + s->byte = 0; + s->byte_count = 0; + s->bitstream = (uint8_t*) MALLOC (limit); + s->limit = limit; + s->eos = 0; +} + + +static inline +void bitcoder_encoder_done (BitCoderState *s) +{ + FREE (s->bitstream); +} + + +static inline +void bitcoder_decoder_init (BitCoderState *s, uint8_t *bitstream, uint32_t limit) +{ + s->bit_count = -1; + s->byte = 0; + s->byte_count = 0; + s->bitstream = bitstream; + s->limit = limit; + s->eos = 0; +} + + +static inline +uint32_t bitcoder_flush (BitCoderState *s) +{ + if (s->bit_count > 0 && s->byte_count < s->limit) + s->bitstream [s->byte_count++] = s->byte << (8 - s->bit_count); + +//printf ("%s: %i bytes written.\n", __FUNCTION__, s->byte_count); +//printf ("%s: last bit %i\n", __FUNCTION__, s->bit_count); + return s->byte_count; +} + + + +static inline +void bitcoder_write_bit (BitCoderState *s, int bit) +{ + s->byte <<= 1; + s->byte |= bit & 1; + + s->bit_count++; + + if (s->bit_count == 8) { + if (s->byte_count < s->limit) { + s->bitstream [s->byte_count++] = s->byte; + s->bit_count = 0; + } else { + s->eos = 1; + } + } +} + + +static inline +int bitcoder_read_bit (BitCoderState *s) +{ + int ret; + + if (s->bit_count <= 0) { + if (!s->bitstream) { + s->eos = 1; + return 0; + } + + if (s->byte_count < s->limit) { + s->byte = s->bitstream [s->byte_count++]; + } else { + s->eos = 1; + s->byte = 0; + } + + s->bit_count = 8; + } + + ret = s->byte >> 7; + s->byte <<= 1; + s->bit_count--; + + return ret & 1; +} + + + + + + +static inline +void bit_print (TYPE byte) +{ + int bit = 8*sizeof(TYPE); + + do { + bit--; + printf ((byte & (1 << bit)) ? "1" : "0"); + } while (bit); + printf ("\n"); +} + +#endif + |