added LCL decoder by Roberto Togni <r_togni@libero.it>, removed my old vd_zlib

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@7223 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 738 insertions, 0 deletions

diff --git a/libmpcodecs/vd_lcl.c b/libmpcodecs/vd_lcl.c
new file mode 100644
index 0000000000..5e0ea824d0
--- /dev/null
+++ b/libmpcodecs/vd_lcl.c
@@ -0,0 +1,738 @@
+/*
+ *
+ * LCL (LossLess Codec Library) Decoder for Mplayer
+ * (c) 2002 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,...)
+{
+  switch(cmd) {
+    case VDCTRL_QUERY_FORMAT:
+      if  (*((int*)arg) == IMGFMT_BGR24)
+        return CONTROL_TRUE;
+      else
+        return CONTROL_FALSE;
+  }
+  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:
+      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:
+          mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[LCL] Unsupported compression format for ZLIB (%d).\n", hc->compression);
+          return 0;
+      }
+      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:
+      switch (hc->compression) {
+        case COMP_ZLIB_HISPEED:
+        case COMP_ZLIB_HICOMP:
+        case COMP_ZLIB_NORMAL:
+#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 (%d != %d)\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 != %d)\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 != %d)\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 ZLIB compression in frame decoder.\n");
+          return 0;
+      }
+      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:
+        for (row = 0; row < height; row++) {
+          pixel_ptr = row * width * 3;
+          yq = encoded[pixel_ptr++];
+          uqvq = encoded[pixel_ptr++] + (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_RGB24: // No
+        for (row = 0; row < height; row++) {
+          pixel_ptr = row * width * 3;
+          yq = encoded[pixel_ptr++];
+          uqvq = encoded[pixel_ptr++] + (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);
+}
+