libavcodec/lcldec.c File Reference

LCL (LossLess Codec Library) Video Codec Decoder for MSZH and ZLIB codecs Experimental encoder for ZLIB RGB24. More...

#include <stdio.h>
#include <stdlib.h>
#include "avcodec.h"
#include "bytestream.h"
#include "lcl.h"
#include "libavutil/lzo.h"
#include <zlib.h>

Go to the source code of this file.

Data Structures
struct	LclDecContext
Typedefs
typedef struct LclDecContext	LclDecContext
Functions
static unsigned int	mszh_decomp (const unsigned char *srcptr, int srclen, unsigned char *destptr, unsigned int destsize)
static int	zlib_decomp (AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
	decompress a zlib-compressed data block into decomp_buf
static int	decode_frame (AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
static av_cold int	decode_init (AVCodecContext *avctx)
static av_cold int	decode_end (AVCodecContext *avctx)
Variables
AVCodec	ff_mszh_decoder
AVCodec	ff_zlib_decoder

---

Detailed Description

LCL (LossLess Codec Library) Video Codec Decoder for MSZH and ZLIB codecs Experimental encoder for ZLIB RGB24.

Fourcc: MSZH, ZLIB

Original Win32 dll: Ver2.23 By Kenji Oshima 2000.09.20 avimszh.dll, avizlib.dll

A description of the decoding algorithm can be found here: http://www.pcisys.net/~melanson/codecs

Supports: BGR24 (RGB 24bpp)

Definition in file lcldec.c.

---

Typedef Documentation

typedef struct LclDecContext LclDecContext

---

Function Documentation

static av_cold int decode_end

(

AVCodecContext *

avctx

)

[static]

Definition at line 617 of file lcldec.c.

static int decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		AVPacket *	avpkt
	)			[static]

Definition at line 160 of file lcldec.c.

static av_cold int decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 470 of file lcldec.c.

static unsigned int mszh_decomp	(	const unsigned char *	srcptr,
		int	srclen,
		unsigned char *	destptr,
		unsigned int	destsize
	)			[static]

Parameters:

	srcptr	compressed source buffer, must be padded with at least 5 extra bytes
	destptr	must be padded sufficiently for av_memcpy_backptr

Definition at line 79 of file lcldec.c.

Referenced by decode_frame().

static int zlib_decomp	(	AVCodecContext *	avctx,
		const uint8_t *	src,
		int	src_len,
		int	offset,
		int	expected
	)			[static]

decompress a zlib-compressed data block into decomp_buf

Parameters:

	src	compressed input buffer
	src_len	data length in input buffer
	offset	offset in decomp_buf
	expected	expected decompressed length

Definition at line 128 of file lcldec.c.

Referenced by decode_frame().

---

Variable Documentation

AVCodec ff_mszh_decoder

Initial value:

 {
    .name           = "mszh",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_MSZH,
    .priv_data_size = sizeof(LclDecContext),
    .init           = decode_init,
    .close          = decode_end,
    .decode         = decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
}

Definition at line 633 of file lcldec.c.

AVCodec ff_zlib_decoder

Initial value:

 {
    .name           = "zlib",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_ZLIB,
    .priv_data_size = sizeof(LclDecContext),
    .init           = decode_init,
    .close          = decode_end,
    .decode         = decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
}

Definition at line 647 of file lcldec.c.