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mpv/libmpcodecs/vd_lcl.c

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/*
*
* LCL (LossLess Codec Library) Decoder for Mplayer
* (c) 2002, 2003 Roberto Togni
*
* Fourcc: MSZH, ZLIB
*
* 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
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "config.h"
#ifdef HAVE_ZLIB
#include <zlib.h>
#endif
#include "mp_msg.h"
#include "vd_internal.h"
static vd_info_t info = {
"LCL Video decoder",
"lcl",
"Roberto Togni",
"Roberto Togni",
"native codec"
};
LIBVD_EXTERN(lcl)
#define BMPTYPE_YUV 1
#define BMPTYPE_RGB 2
#define IMGTYPE_YUV111 0
#define IMGTYPE_YUV422 1
#define IMGTYPE_RGB24 2
#define IMGTYPE_YUV411 3
#define IMGTYPE_YUV211 4
#define IMGTYPE_YUV420 5
#define COMP_MSZH 0
#define COMP_MSZH_NOCOMP 1
#define COMP_ZLIB_HISPEED 1
#define COMP_ZLIB_HICOMP 9
#define COMP_ZLIB_NORMAL -1
#define FLAG_MULTITHREAD 1
#define FLAG_NULLFRAME 2
#define FLAG_PNGFILTER 4
#define FLAGMASK_UNUSED 0xf8
#define CODEC_MSZH 1
#define CODEC_ZLIB 3
#define FOURCC_MSZH mmioFOURCC('M','S','Z','H')
#define FOURCC_ZLIB mmioFOURCC('Z','L','I','B')
/*
* Decoder context
*/
typedef struct {
// Image type
int imgtype;
// Compression type
int compression;
// Flags
int flags;
// Codec type
int codec;
// Decompressed data size
unsigned int decomp_size;
// Decompression buffer
unsigned char* decomp_buf;
#ifdef HAVE_ZLIB
z_stream zstream;
#endif
} lcl_context_t;
/*
* Internal function prototypes
*/
// to set/get/query special features/parameters
static int control(sh_video_t *sh,int cmd,void* arg,...)
{
return CONTROL_UNKNOWN;
}
/*
*
* Init LCL decoder
*
*/
static int init(sh_video_t *sh)
{
int vo_ret; // Video output init ret value
int zret; // Zlib return code
lcl_context_t *hc; // Decoder context
BITMAPINFOHEADER *bih = sh->bih;
int basesize = bih->biWidth * bih->biHeight;
if ((hc = malloc(sizeof(lcl_context_t))) == NULL) {
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "Can't allocate memory for LCL decoder context.\n");
return 0;
}
sh->context = (void *)hc;
#ifdef HAVE_ZLIB
// Needed if zlib unused or init aborted before inflateInit
memset(&(hc->zstream), 0, sizeof(z_stream));
#endif
if ((bih->biCompression != FOURCC_MSZH) && (bih->biCompression != FOURCC_ZLIB)) {
mp_msg(MSGT_DECVIDEO, MSGL_WARN, "[LCL] Unknown BITMAPHEADER fourcc.\n");
return 0;
}
if (bih->biSize < sizeof(BITMAPINFOHEADER) + 8) {
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] BITMAPHEADER size too small.\n");
return 0;
}
/* Detect codec type */
switch (hc->codec = *((char *)bih + sizeof(BITMAPINFOHEADER) + 7)) {
case CODEC_MSZH:
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] Codec is MSZH.\n");
break;
case CODEC_ZLIB:
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] Codec is ZLIB.\n");
break;
default:
mp_msg(MSGT_DECVIDEO, MSGL_WARN, "[LCL] Unknown codec id %d. Trusting fourcc.\n", hc->codec);
switch (bih->biCompression) {
case FOURCC_MSZH:
hc->codec = CODEC_MSZH;
break;
case FOURCC_ZLIB:
hc->codec = CODEC_ZLIB;
break;
default:
mp_msg(MSGT_DECVIDEO, MSGL_WARN, "[LCL] BUG! Unknown coded id and fourcc. Why am I here?.\n");
return 0;
}
}
/* Detect image type */
switch (hc->imgtype = *((char *)bih + sizeof(BITMAPINFOHEADER) + 4)) {
case IMGTYPE_YUV111:
hc->decomp_size = basesize * 3;
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] Image type is YUV 1:1:1.\n");
break;
case IMGTYPE_YUV422:
hc->decomp_size = basesize * 2;
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] Image type is YUV 4:2:2.\n");
break;
case IMGTYPE_RGB24:
hc->decomp_size = basesize * 3;
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] Image type is RGB 24.\n");
break;
case IMGTYPE_YUV411:
hc->decomp_size = basesize / 2 * 3;
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] Image type is YUV 4:1:1.\n");
break;
case IMGTYPE_YUV211:
hc->decomp_size = basesize * 2;
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] Image type is YUV 2:1:1.\n");
break;
case IMGTYPE_YUV420:
hc->decomp_size = basesize / 2 * 3;
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] Image type is YUV 4:2:0.\n");
break;
default:
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] Unsupported image format %d.\n", hc->imgtype);
return 0;
}
/* Detect compression method */
hc->compression = *((char *)bih + sizeof(BITMAPINFOHEADER) + 5);
switch (hc->codec) {
case CODEC_MSZH:
switch (hc->compression) {
case COMP_MSZH:
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] Compression enabled.\n");
break;
case COMP_MSZH_NOCOMP:
hc->decomp_size = 0;
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] No compression.\n");
break;
default:
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] Unsupported compression format for MSZH (%d).\n", hc->compression);
return 0;
}
break;
case CODEC_ZLIB:
#ifdef HAVE_ZLIB
switch (hc->compression) {
case COMP_ZLIB_HISPEED:
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] High speed compression.\n");
break;
case COMP_ZLIB_HICOMP:
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] High compression.\n");
break;
case COMP_ZLIB_NORMAL:
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] Normal compression.\n");
break;
default:
if ((hc->compression < Z_NO_COMPRESSION) || (hc->compression > Z_BEST_COMPRESSION)) {
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] Unusupported compression level for ZLIB: (%d).\n", hc->compression);
return 0;
}
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] Compression level for ZLIB: (%d).\n", hc->compression);
}
#else
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] Zlib support not compiled.\n");
return 0;
#endif
break;
default:
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] BUG! Unknown codec in compression switch.\n");
return 0;
}
/* Allocate decompression buffer */
/* 4*8 max oveflow space for mszh decomp algorithm */
if (hc->decomp_size) {
if ((hc->decomp_buf = malloc(hc->decomp_size+4*8)) == NULL) {
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] Can't allocate decompression buffer.\n");
return 0;
}
}
/* Detect flags */
hc->flags = *((char *)bih + sizeof(BITMAPINFOHEADER) + 6);
if (hc->flags & FLAG_MULTITHREAD)
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] Multithread encoder flag set.\n");
if (hc->flags & FLAG_NULLFRAME)
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] Nullframe insertion flag set.\n");
if ((hc->codec == CODEC_ZLIB) && (hc->flags & FLAG_PNGFILTER))
mp_msg(MSGT_DECVIDEO, MSGL_INFO, "[LCL] PNG filter flag set.\n");
if (hc->flags & FLAGMASK_UNUSED)
mp_msg(MSGT_DECVIDEO, MSGL_WARN, "[LCL] Unknown flag set (%d).\n", hc->flags);
/* If needed init zlib */
if (hc->codec == CODEC_ZLIB) {
#ifdef HAVE_ZLIB
hc->zstream.zalloc = Z_NULL;
hc->zstream.zfree = Z_NULL;
hc->zstream.opaque = Z_NULL;
zret = inflateInit(&(hc->zstream));
if (zret != Z_OK) {
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] Inflate init error: %d\n", zret);
return 0;
}
#else
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] Zlib support not compiled.\n");
return 0;
#endif
}
/*
* Initialize video output device
*/
vo_ret = mpcodecs_config_vo(sh,sh->disp_w,sh->disp_h,IMGFMT_BGR24);
return vo_ret;
}
/*
*
* Uninit LCL decoder
*
*/
static void uninit(sh_video_t *sh)
{
lcl_context_t *hc = (lcl_context_t *) sh->context; // Decoder context
if (sh->context) {
#ifdef HAVE_ZLIB
inflateEnd(&hc->zstream);
#endif
free(sh->context);
}
}
inline unsigned char fix (int pix14)
{
int tmp;
tmp = (pix14 + 0x80000) >> 20;
if (tmp < 0)
return 0;
if (tmp > 255)
return 255;
return tmp;
}
inline unsigned char get_b (unsigned char yq, signed char bq)
{
return fix((yq << 20) + bq * 1858076);
}
inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)
{
return fix((yq << 20) - bq * 360857 - rq * 748830);
}
inline unsigned char get_r (unsigned char yq, signed char rq)
{
return fix((yq << 20) + rq * 1470103);
}
int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr);
/*
*
* Decode a frame
*
*/
static mp_image_t* decode(sh_video_t *sh,void* data,int len,int flags)
{
mp_image_t* mpi;
int pixel_ptr;
int row, col;
unsigned char *encoded = (unsigned char *)data;
lcl_context_t *hc = (lcl_context_t *) sh->context; // Decoder context
unsigned char *outptr;
int width = sh->disp_w; // Real image width
int height = sh->disp_h; // Real image height
#ifdef HAVE_ZLIB
int zret; // Zlib return code
#endif
unsigned int mszh_dlen;
unsigned char yq, y1q, uq, vq;
int uqvq;
unsigned int mthread_inlen, mthread_outlen;
// Skipped frame
if(len <= 0)
return NULL;
/* Get output image buffer */
mpi=mpcodecs_get_image(sh, MP_IMGTYPE_TEMP, 0, sh->disp_w, sh->disp_h);
if (!mpi) {
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "Can't allocate mpi image for lcl codec.\n");
return NULL;
}
outptr = mpi->planes[0]; // Output image pointer
/* Decompress frame */
switch (hc->codec) {
case CODEC_MSZH:
switch (hc->compression) {
case COMP_MSZH:
if (hc->flags & FLAG_MULTITHREAD) {
mthread_inlen = *((unsigned int*)encoded);
mthread_outlen = *((unsigned int*)(encoded+4));
mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, hc->decomp_buf);
if (mthread_outlen != mszh_dlen) {
mp_msg(MSGT_DECVIDEO, MSGL_WARN, "[LCL] MSZH: mthread1 decoded size differs (%d != %d)\n",
mthread_outlen, mszh_dlen);
}
mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - mthread_inlen,
hc->decomp_buf + mthread_outlen);
if ((hc->decomp_size - mthread_outlen) != mszh_dlen) {
mp_msg(MSGT_DECVIDEO, MSGL_WARN, "[LCL] MSZH: mthread2 decoded size differs (%d != %d)\n",
hc->decomp_size - mthread_outlen, mszh_dlen);
}
encoded = hc->decomp_buf;
len = hc->decomp_size;
} else {
mszh_dlen = mszh_decomp(encoded, len, hc->decomp_buf);
if (hc->decomp_size != mszh_dlen) {
mp_msg(MSGT_DECVIDEO, MSGL_WARN, "[LCL] MSZH: decoded size differs (%d != %d)\n",
hc->decomp_size, mszh_dlen);
}
encoded = hc->decomp_buf;
len = mszh_dlen;
}
break;
case COMP_MSZH_NOCOMP:
break;
default:
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] BUG! Unknown MSZH compression in frame decoder.\n");
return 0;
}
break;
case CODEC_ZLIB:
#ifdef HAVE_ZLIB
zret = inflateReset(&(hc->zstream));
if (zret != Z_OK) {
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] ZLIB: inflate reset error: %d\n", zret);
return 0;
}
if (hc->flags & FLAG_MULTITHREAD) {
mthread_inlen = *((unsigned int*)encoded);
mthread_outlen = *((unsigned int*)(encoded+4));
hc->zstream.next_in = encoded + 8;
hc->zstream.avail_in = mthread_inlen;
hc->zstream.next_out = hc->decomp_buf;
hc->zstream.avail_out = mthread_outlen;
zret = inflate(&(hc->zstream), Z_FINISH);
if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] ZLIB: mthread1 inflate error: %d\n", zret);
return 0;
}
if (mthread_outlen != (unsigned int)(hc->zstream.total_out)) {
mp_msg(MSGT_DECVIDEO, MSGL_WARN, "[LCL] ZLIB: mthread1 decoded size differs (%u != %lu)\n",
mthread_outlen, hc->zstream.total_out);
}
zret = inflateReset(&(hc->zstream));
if (zret != Z_OK) {
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] ZLIB: mthread2 inflate reset error: %d\n", zret);
return 0;
}
hc->zstream.next_in = encoded + 8 + mthread_inlen;
hc->zstream.avail_in = len - mthread_inlen;
hc->zstream.next_out = hc->decomp_buf + mthread_outlen;
hc->zstream.avail_out = mthread_outlen;
zret = inflate(&(hc->zstream), Z_FINISH);
if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] ZLIB: mthread2 inflate error: %d\n", zret);
return 0;
}
if ((hc->decomp_size - mthread_outlen) != (unsigned int)(hc->zstream.total_out)) {
mp_msg(MSGT_DECVIDEO, MSGL_WARN, "[LCL] ZLIB: mthread2 decoded size differs (%d != %lu)\n",
hc->decomp_size - mthread_outlen, hc->zstream.total_out);
}
} else {
hc->zstream.next_in = data;
hc->zstream.avail_in = len;
hc->zstream.next_out = hc->decomp_buf;
hc->zstream.avail_out = hc->decomp_size;
zret = inflate(&(hc->zstream), Z_FINISH);
if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] ZLIB: inflate error: %d\n", zret);
return 0;
}
if (hc->decomp_size != (unsigned int)(hc->zstream.total_out)) {
mp_msg(MSGT_DECVIDEO, MSGL_WARN, "[LCL] ZLIB: decoded size differs (%d != %lu)\n",
hc->decomp_size, hc->zstream.total_out);
}
}
encoded = hc->decomp_buf;
len = hc->decomp_size;;
#else
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] BUG! Zlib support not compiled in frame decoder.\n");
return 0;
#endif
break;
default:
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] BUG! Unknown codec in frame decoder compression switch.\n");
return 0;
}
/* Apply PNG filter */
if ((hc->codec == CODEC_ZLIB) && (hc->flags & FLAG_PNGFILTER)) {
switch (hc->imgtype) {
case IMGTYPE_YUV111:
case IMGTYPE_RGB24:
for (row = 0; row < height; row++) {
pixel_ptr = row * width * 3;
yq = encoded[pixel_ptr++];
uqvq = encoded[pixel_ptr++];
uqvq+=(encoded[pixel_ptr++] << 8);
for (col = 1; col < width; col++) {
encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
uqvq -= (encoded[pixel_ptr+1] | (encoded[pixel_ptr+2]<<8));
encoded[pixel_ptr+1] = (uqvq) & 0xff;
encoded[pixel_ptr+2] = ((uqvq)>>8) & 0xff;
pixel_ptr += 3;
}
}
break;
case IMGTYPE_YUV422:
for (row = 0; row < height; row++) {
pixel_ptr = row * width * 2;
yq = uq = vq =0;
for (col = 0; col < width/4; col++) {
encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
pixel_ptr += 8;
}
}
break;
case IMGTYPE_YUV411:
for (row = 0; row < height; row++) {
pixel_ptr = row * width / 2 * 3;
yq = uq = vq =0;
for (col = 0; col < width/4; col++) {
encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
pixel_ptr += 6;
}
}
break;
case IMGTYPE_YUV211:
for (row = 0; row < height; row++) {
pixel_ptr = row * width * 2;
yq = uq = vq =0;
for (col = 0; col < width/2; col++) {
encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
pixel_ptr += 4;
}
}
break;
case IMGTYPE_YUV420:
for (row = 0; row < height/2; row++) {
pixel_ptr = row * width * 3;
yq = y1q = uq = vq =0;
for (col = 0; col < width/2; col++) {
encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
pixel_ptr += 6;
}
}
break;
break;
default:
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] BUG! Unknown imagetype in pngfilter switch.\n");
return 0;
}
}
/* Convert colorspace */
switch (hc->imgtype) {
case IMGTYPE_YUV111:
for (row = height - 1; row >= 0; row--) {
pixel_ptr = row * mpi->stride[0];
for (col = 0; col < width; col++) {
outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);
outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);
outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);
encoded += 3;
}
}
break;
case IMGTYPE_YUV422:
for (row = height - 1; row >= 0; row--) {
pixel_ptr = row * mpi->stride[0];
for (col = 0; col < width/4; col++) {
outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);
outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);
outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);
outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);
outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);
outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);
outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);
outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);
outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);
outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);
encoded += 8;
}
}
break;
case IMGTYPE_RGB24:
for (row = height - 1; row >= 0; row--) {
pixel_ptr = row * mpi->stride[0];
for (col = 0; col < width; col++) {
outptr[pixel_ptr++] = encoded[0];
outptr[pixel_ptr++] = encoded[1];
outptr[pixel_ptr++] = encoded[2];
encoded += 3;
}
}
break;
case IMGTYPE_YUV411:
for (row = height - 1; row >= 0; row--) {
pixel_ptr = row * mpi->stride[0];
for (col = 0; col < width/4; col++) {
outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);
outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);
outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);
outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);
outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);
outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);
outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);
outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);
outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);
outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);
encoded += 6;
}
}
break;
case IMGTYPE_YUV211:
for (row = height - 1; row >= 0; row--) {
pixel_ptr = row * mpi->stride[0];
for (col = 0; col < width/2; col++) {
outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);
outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);
outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);
outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);
outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);
outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);
encoded += 4;
}
}
break;
case IMGTYPE_YUV420:
for (row = height / 2 - 1; row >= 0; row--) {
pixel_ptr = 2 * row * mpi->stride[0];
for (col = 0; col < width/2; col++) {
outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);
outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);
outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);
outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);
outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);
outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);
outptr[pixel_ptr-mpi->stride[0]] = get_b(encoded[2], encoded[4]);
outptr[pixel_ptr-mpi->stride[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);
outptr[pixel_ptr-mpi->stride[0]+2] = get_r(encoded[2], encoded[5]);
outptr[pixel_ptr-mpi->stride[0]+3] = get_b(encoded[3], encoded[4]);
outptr[pixel_ptr-mpi->stride[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);
outptr[pixel_ptr-mpi->stride[0]+5] = get_r(encoded[3], encoded[5]);
pixel_ptr += 6;
encoded += 6;
}
}
break;
default:
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] BUG! Unknown imagetype in image decoder.\n");
return 0;
}
return mpi;
}
int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr)
{
unsigned char *destptr_bak = destptr;
unsigned char mask = 0;
unsigned char maskbit = 0;
unsigned int ofs, cnt;
while (srclen > 0) {
if (maskbit == 0) {
mask = *(srcptr++);
maskbit = 8;
srclen--;
continue;
}
if ((mask & (1 << (--maskbit))) == 0) {
*(destptr++) = *(srcptr++);
*(destptr++) = *(srcptr++);
*(destptr++) = *(srcptr++);
*(destptr++) = *(srcptr++);
srclen -= 4;
} else {
ofs = *(srcptr++);
cnt = *(srcptr++);
ofs += cnt * 256;;
cnt = ((cnt >> 3) & 0x1f) + 1;
ofs &= 0x7ff;
srclen -= 2;
cnt *= 4;
for (; cnt > 0; cnt--) {
*(destptr) = *(destptr - ofs);
destptr++;
}
}
}
return (destptr - destptr_bak);
}
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