From ab711b3c8d59671e2f506a9febd030f74fda006b Mon Sep 17 00:00:00 2001
From: Mike Melanson <mike@multimedia.cx>
Date: Wed, 27 Oct 2004 04:30:48 +0000
Subject: Miro VideoXL (VIXL) decoder, courtesy of Konstantin Shishkov

Originally committed as revision 3641 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/xl.c | 144 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 libavcodec/xl.c

(limited to 'libavcodec/xl.c')

diff --git a/libavcodec/xl.c b/libavcodec/xl.c
new file mode 100644
index 0000000000..0f496017d9
--- /dev/null
+++ b/libavcodec/xl.c
@@ -0,0 +1,144 @@
+/*
+ * Miro VideoXL codec
+ * Copyright (c) 2004 Konstantin Shishkov
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+ 
+/**
+ * @file xl.c
+ * Miro VideoXL codec.
+ */
+ 
+#include "avcodec.h"
+#include "mpegvideo.h"
+
+typedef struct VideoXLContext{
+    AVCodecContext *avctx;
+    AVFrame pic;
+} VideoXLContext;
+
+const int xl_table[32] = {
+   0,   1,   2,   3,   4,   5,   6,   7,
+   8,   9,  12,  15,  20,  25,  34,  46,
+  64,  82,  94, 103, 108, 113, 116, 119,
+ 120, 121, 122, 123, 124, 125, 126, 127};
+
+static int decode_frame(AVCodecContext *avctx, 
+                        void *data, int *data_size,
+                        uint8_t *buf, int buf_size)
+{
+    VideoXLContext * const a = avctx->priv_data;
+    AVFrame * const p= (AVFrame*)&a->pic;
+    uint8_t *Y, *U, *V;
+    int i, j;
+    int stride;
+    uint32_t val;
+    int y0, y1, y2, y3, c0, c1;
+        
+    
+    /* special case for last picture */
+    if (buf_size == 0) {
+        return 0;
+    }
+
+    if(p->data[0])
+        avctx->release_buffer(avctx, p);
+
+    p->reference = 0;
+    if(avctx->get_buffer(avctx, p) < 0){
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return -1;
+    }
+    p->pict_type= I_TYPE;
+    p->key_frame= 1;
+
+    Y = a->pic.data[0];
+    U = a->pic.data[1];
+    V = a->pic.data[2];
+    
+    stride = avctx->width - 4;
+    for (i = 0; i < avctx->height; i++) {
+        /* lines are stored in reversed order */
+        buf += stride;
+        
+        for (j = 0; j < avctx->width; j += 4) {
+            /* value is stored in LE dword with word swapped */
+            val = LE_32(buf);
+            buf -= 4;
+            val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16);
+    
+            if(!j)
+                y0 = (val & 0x1F) << 2;
+            else
+                y0 = y3 + xl_table[val & 0x1F];
+            val >>= 5;
+            y1 = y0 + xl_table[val & 0x1F];
+            val >>= 5;
+            y2 = y1 + xl_table[val & 0x1F];
+            val >>= 6; /* align to word */
+            y3 = y2 + xl_table[val & 0x1F];
+            val >>= 5;
+            if(!j)
+                c0 = (val & 0x1F) << 2;
+            else
+                c0 += xl_table[val & 0x1F];
+            val >>= 5;
+            if(!j)
+                c1 = (val & 0x1F) << 2;
+            else
+                c1 += xl_table[val & 0x1F];
+            
+            Y[j + 0] = y0 << 1;
+            Y[j + 1] = y1 << 1;
+            Y[j + 2] = y2 << 1;
+            Y[j + 3] = y3 << 1;
+            
+            U[j >> 2] = c0 << 1;
+            V[j >> 2] = c1 << 1;
+        }
+        
+        buf += avctx->width + 4;
+        Y += a->pic.linesize[0];
+        U += a->pic.linesize[1];
+        V += a->pic.linesize[2];
+    }
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame*)data = a->pic;
+    
+    return buf_size;
+}
+
+static int decode_init(AVCodecContext *avctx){
+//    VideoXLContext * const a = avctx->priv_data;
+
+    avctx->pix_fmt= PIX_FMT_YUV411P;
+
+    return 0;
+}
+
+AVCodec xl_decoder = {
+    "xl",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_VIXL,
+    sizeof(VideoXLContext),
+    decode_init,
+    NULL,
+    NULL,
+    decode_frame,
+    CODEC_CAP_DR1,
+};
-- 
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