From 512c294b4865e2fab1d99f079eda64c517cdb252 Mon Sep 17 00:00:00 2001
From: melanson <melanson@b3059339-0415-0410-9bf9-f77b7e298cf2>
Date: Sun, 23 Dec 2001 22:20:46 +0000
Subject: This commit adds initial support for Quicktime Animation (RLE) video.
 It also fixes a FLI function name (FLI is not an AVI decoder).

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@3688 b3059339-0415-0410-9bf9-f77b7e298cf2
---
 qtrle.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 qtrle.c

(limited to 'qtrle.c')

diff --git a/qtrle.c b/qtrle.c
new file mode 100644
index 0000000000..6d46f9b32c
--- /dev/null
+++ b/qtrle.c
@@ -0,0 +1,125 @@
+/*
+    Quicktime Animation (RLE) Decoder for MPlayer
+
+    (C) 2001 Mike Melanson
+*/
+
+#include "config.h"
+#include "bswap.h"
+
+#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_rle24(
+  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 r, g, b;
+
+  // 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 ((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;
+        r = encoded[stream_ptr++];
+        g = encoded[stream_ptr++];
+        b = encoded[stream_ptr++];
+        while (rle_code--)
+        {
+          decoded[pixel_ptr++] = b;
+          decoded[pixel_ptr++] = g;
+          decoded[pixel_ptr++] = r;
+          if (bytes_per_pixel == 4)
+            pixel_ptr++;
+        }
+      }
+      else
+      {
+        // copy pixels directly to output
+        while (rle_code--)
+        {
+          decoded[pixel_ptr++] = encoded[stream_ptr + 2];
+          decoded[pixel_ptr++] = encoded[stream_ptr + 1];
+          decoded[pixel_ptr++] = encoded[stream_ptr + 0];
+          stream_ptr += 3;
+          if (bytes_per_pixel == 4)
+            pixel_ptr++;
+        }
+      }
+    }
+
+    row_ptr += row_inc;
+  }
+}
+
+void qt_decode_rle(
+  unsigned char *encoded,
+  int encoded_size,
+  unsigned char *decoded,
+  int width,
+  int height,
+  int encoded_bpp,
+  int bytes_per_pixel)
+{
+  switch (encoded_bpp)
+  {
+    case 24:
+      qt_decode_rle24(
+        encoded,
+        encoded_size,
+        decoded,
+        width,
+        height,
+        bytes_per_pixel);
+      break;
+  }
+}
-- 
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