mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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2f0cc8ec30
Original commit message from CVS: Moved from gst-plugins/ext/mplex/. See that directory for older changelogs.
82 lines
1.7 KiB
C++
82 lines
1.7 KiB
C++
#ifndef __BITS_H__
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#define __BITS_H__
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#include <config.h>
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#include <stdio.h>
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typedef uint64_t bitcount_t;
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class BitStreamUndo
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{
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//protected:
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public:
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uint8_t outbyte;
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unsigned int byteidx;
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int bitidx;
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unsigned int bufcount;
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fpos_t actpos;
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bitcount_t totbits;
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bitcount_t buffer_start;
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bitcount_t readpos;
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uint8_t *bfr;
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unsigned int bfr_size;
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public:
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bool eobs;
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};
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typedef class BitStream _BitStream;
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typedef size_t (*ReadCallback) (_BitStream *bs, uint8_t *dest, size_t size, void *user_data);
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class BitStream : public BitStreamUndo
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{
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public:
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void *user_data;
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static const unsigned int BUFFER_SIZE = 4 * 1024;
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public:
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BitStream ();
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~BitStream ();
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inline bitcount_t bitcount ()
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{
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return totbits;
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}
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inline bool eos ()
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{
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return eobs;
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}
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};
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//
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// Input bit stream class. Supports the "scanning" of a stream
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// into a large buffer which is flushed once it has been read.
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// N.b. if you scan ahead a long way and don't read its your
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// responsibility to flush manually...
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//
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class IBitStream:public BitStream
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{
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public:
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void open (ReadCallback read_callback, void *user_data, unsigned int buf_size = BUFFER_SIZE);
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void SetBufSize (unsigned int buf_size);
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void close ();
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uint32_t get1bit ();
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uint32_t getbits (int N);
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void prepareundo (BitStreamUndo & undobuf);
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void undochanges (BitStreamUndo & undobuf);
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bool seek_sync (unsigned int sync, int N, int lim);
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void flush (bitcount_t bitposition);
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inline unsigned int buffered_bytes ()
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{
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return (buffer_start + bufcount - readpos);
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}
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unsigned int read_buffered_bytes (uint8_t * dst, unsigned int length_bytes);
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private:
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bool refill_buffer ();
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static uint8_t masks[8];
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ReadCallback read_callback;
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};
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#endif // __BITS_H__
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