8 and 16bpp qtrle support

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@6721 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 177 insertions, 3 deletions

diff --git a/libmpcodecs/native/qtrle.c b/libmpcodecs/native/qtrle.c
index 89cf99c10c..23d761c038 100644
--- a/libmpcodecs/native/qtrle.c
+++ b/libmpcodecs/native/qtrle.c
@@ -2,6 +2,7 @@
     Quicktime Animation (RLE) Decoder for MPlayer
 
     (C) 2001 Mike Melanson
+    8 and 16bpp support by Alex Beregszaszi
 */
 
 #include "config.h"
@@ -10,9 +11,164 @@
 #define BE_16(x) (be2me_16(*(unsigned short *)(x)))
 #define BE_32(x) (be2me_32(*(unsigned int *)(x)))
 
-// 256 RGB entries; 25% of these bytes will be unused, but it's faster
-// to index 4-byte entries
-static unsigned char palette[256 * 4];
+void qt_decode_rle8(
+  unsigned char *encoded,
+  int encoded_size,
+  unsigned char *decoded,
+  int width,
+  int height,
+  int bytes_per_pixel)
+{
+  int stream_ptr;
+  int header;
+  int start_line;
+  int lines_to_change;
+  signed char rle_code;
+  int row_ptr, pixel_ptr;
+  int row_inc = bytes_per_pixel * width;
+  unsigned char pixel;
+
+  // check if this frame is even supposed to change
+  if (encoded_size < 8)
+    return;
+
+  // start after the chunk size
+  stream_ptr = 4;
+
+  // fetch the header
+  header = BE_16(&encoded[stream_ptr]);
+  stream_ptr += 2;
+
+  // if a header is present, fetch additional decoding parameters
+  if (header & 0x0008)
+  {
+    start_line = BE_16(&encoded[stream_ptr]);
+    stream_ptr += 4;
+    lines_to_change = BE_16(&encoded[stream_ptr]);
+    stream_ptr += 4;
+  }
+  else
+  {
+    start_line = 0;
+    lines_to_change = height;
+  }
+
+  row_ptr = row_inc * start_line;
+  while (lines_to_change--)
+  {
+    pixel_ptr = row_ptr + ((encoded[stream_ptr++] - 1) * bytes_per_pixel);
+
+    while (stream_ptr < encoded_size &&
+           (rle_code = (signed char)encoded[stream_ptr++]) != -1)
+    {
+      if (rle_code == 0)
+        // there's another skip code in the stream
+        pixel_ptr += ((encoded[stream_ptr++] - 1) * bytes_per_pixel);
+      else if (rle_code < 0)
+      {
+        // decode the run length code
+        rle_code = -rle_code;
+        pixel = encoded[stream_ptr++];
+        while (rle_code--)
+        {
+          decoded[pixel_ptr++] = pixel;
+        }
+      }
+      else
+      {
+        // copy pixels directly to output
+        while (rle_code--)
+        {
+          decoded[pixel_ptr++] = encoded[stream_ptr + 0];
+          stream_ptr += 1;
+        }
+      }
+    }
+
+    row_ptr += row_inc;
+  }
+}
+
+void qt_decode_rle16(
+  unsigned char *encoded,
+  int encoded_size,
+  unsigned char *decoded,
+  int width,
+  int height,
+  int bytes_per_pixel)
+{
+  int stream_ptr;
+  int header;
+  int start_line;
+  int lines_to_change;
+  signed char rle_code;
+  int row_ptr, pixel_ptr;
+  int row_inc = bytes_per_pixel * width;
+  unsigned char p1, p2;
+
+  // check if this frame is even supposed to change
+  if (encoded_size < 8)
+    return;
+
+  // start after the chunk size
+  stream_ptr = 4;
+
+  // fetch the header
+  header = BE_16(&encoded[stream_ptr]);
+  stream_ptr += 2;
+
+  // if a header is present, fetch additional decoding parameters
+  if (header & 0x0008)
+  {
+    start_line = BE_16(&encoded[stream_ptr]);
+    stream_ptr += 4;
+    lines_to_change = BE_16(&encoded[stream_ptr]);
+    stream_ptr += 4;
+  }
+  else
+  {
+    start_line = 0;
+    lines_to_change = height;
+  }
+
+  row_ptr = row_inc * start_line;
+  while (lines_to_change--)
+  {
+    pixel_ptr = row_ptr + ((encoded[stream_ptr++] - 1) * bytes_per_pixel);
+
+    while (stream_ptr < encoded_size &&
+           (rle_code = (signed char)encoded[stream_ptr++]) != -1)
+    {
+      if (rle_code == 0)
+        // there's another skip code in the stream
+        pixel_ptr += ((encoded[stream_ptr++] - 1) * bytes_per_pixel);
+      else if (rle_code < 0)
+      {
+        // decode the run length code
+        rle_code = -rle_code;
+        p1 = encoded[stream_ptr++];
+        p2 = encoded[stream_ptr++];
+        while (rle_code--)
+        {
+          decoded[pixel_ptr++] = p2;
+          decoded[pixel_ptr++] = p1;
+        }
+      }
+      else
+      {
+        // copy pixels directly to output
+        while (rle_code--)
+        {
+          decoded[pixel_ptr++] = encoded[stream_ptr + 1];
+          decoded[pixel_ptr++] = encoded[stream_ptr + 0];
+          stream_ptr += 2;
+        }
+      }
+    }
+
+    row_ptr += row_inc;
+  }
+}
 
 void qt_decode_rle24(
   unsigned char *encoded,
@@ -113,6 +269,24 @@ void qt_decode_rle(
 {
   switch (encoded_bpp)
   {
+    case 8:
+      qt_decode_rle8(
+        encoded,
+        encoded_size,
+        decoded,
+        width,
+        height,
+        bytes_per_pixel);
+      break;
+    case 16:
+      qt_decode_rle16(
+        encoded,
+        encoded_size,
+        decoded,
+        width,
+        height,
+        bytes_per_pixel);
+      break;
     case 24:
       qt_decode_rle24(
         encoded,