bsdec.c File Reference

#include "bsdec.h"
#include "bsdec-vlc.h"
#include <stdint.h>
#include <string.h>
#include "common/hardware/cop2.h"
#include "common/hardware/pcsxhw.h"
#include "common/kernel/pcdrv.h"
#include "common/syscalls/syscalls.h"

Include dependency graph for bsdec.c:

Classes
struct	BsdecBits

Macros
#define	PROF2()   0
#define	PROF2_ACC(t0, acc)   ((void)(t0))
#define	PROF_COUNT(f)   ((void)0)
#define	PROF_ADD(f, n)   ((void)0)
#define	BSDEC_HALF(base, feed)   ((uint32_t)(base)[feed] | ((uint32_t)(base)[(feed) + 1] << 8))
#define	MAX_IN   (96 * 1024)
#define	MAX_HW   (64 * 1024)
#define	testClz32(v)   ((uint32_t)((v) ? __builtin_clz(v) : 32))

Functions
uint32_t	bsdecRlHalfwords (const void *in, uint32_t inBytes)
	How many run-level halfwords a frame decodes to.
struct BsdecResult	bsdecFrame (const void *in, uint32_t inBytes, uint16_t *out, uint32_t outHalfwords)
	Decode one BS frame into MDEC run-level halfwords.
int	main ()

Macro Definition Documentation

BSDEC_HALF

#define BSDEC_HALF	(		base,
			feed
	)		((uint32_t)(base)[feed] | ((uint32_t)(base)[(feed) + 1] << 8))

MAX_HW

#define MAX_HW   (64 * 1024)

MAX_IN

#define MAX_IN   (96 * 1024)

PROF2

#define PROF2

(

)

0

PROF2_ACC

#define PROF2_ACC	(		t0,
			acc
	)		((void)(t0))

PROF_ADD

#define PROF_ADD	(		f,
			n
	)		((void)0)

PROF_COUNT

#define PROF_COUNT

(

f

)

((void)0)

testClz32

#define testClz32

(

v

)

((uint32_t)((v) ? __builtin_clz(v) : 32))

Function Documentation

bsdecFrame()

struct BsdecResult bsdecFrame	(	const void *	in,
		uint32_t	inBytes,
		uint16_t *	out,
		uint32_t	outHalfwords
	)

Decode one BS frame into MDEC run-level halfwords.

in must be halfword aligned - the bit reader walks the payload in halfword pairs - and in practice it is, since a frame arrives in sector payloads. out needs bsdecRlHalfwords(in, inBytes) entries.

The output is always a complete frame of exactly that many halfwords whenever bsdecUsable() holds, whatever the bitstream did: a partially decoded block is discarded, a short bitstream is padded with end-of-block markers, and a bitstream carrying more than its header declares is cut at the declared length. That is deliberate - a video decoder that refuses a damaged frame outright drops a frame where it could have shown most of one.

bsdecRlHalfwords()

uint32_t bsdecRlHalfwords	(	const void *	in,
		uint32_t	inBytes
	)

How many run-level halfwords a frame decodes to.

Read straight out of the header, so it costs two bytes and can be called before every decode. This is the size out must have. Returns 0 if the buffer is too short to hold a header.

main()

int main

(

void

)