Miro VideoXL (VIXL) decoder, courtesy of Konstantin Shishkov

Originally committed as revision 3641 to svn://svn.ffmpeg.org/ffmpeg/trunk

Changelog

@@ -5,6 +5,7 @@ version <next>
 - Apple QuickDraw (qdrw) video decoder
 - Creative ADPCM audio decoder
 - Electronic Arts Multimedia (WVE/UV2/etc.) file demuxer
+- Miro VideoXL (VIXL) video decoder
 
 version 0.4.9-pre1:
 

doc/ffmpeg-doc.texi

@@ -767,6 +767,7 @@ following image formats are supported:
 @item ZLIB                   @tab  X  @tab  X @tab Part of LCL, encoder experimental
 @item TechSmith Camtasia     @tab     @tab  X @tab fourcc: TSCC
 @item IBM Ultimotion         @tab     @tab  X @tab fourcc: ULTI
+@item Miro VideoXL           @tab     @tab  X @tab fourcc: VIXL
 @end multitable
 
 @code{X} means that the encoding (resp. decoding) is supported.

libavcodec/Makefile

@@ -21,7 +21,7 @@ OBJS= common.o utils.o mem.o allcodecs.o \
       msvideo1.o vqavideo.o idcinvideo.o adx.o rational.o faandct.o 8bps.o \
       smc.o parser.o flicvideo.o truemotion1.o vmdav.o lcl.o qtrle.o g726.o \
       flac.o vp3dsp.o integer.o snow.o tscc.o sonic.o ulti.o h264idct.o \
-      qdrw.o
+      qdrw.o xl.o
 
 ifeq ($(AMR_NB),yes)
 ifeq ($(AMR_NB_FIXED),yes)

libavcodec/allcodecs.c

@@ -109,6 +109,7 @@ void avcodec_register_all(void)
     register_avcodec(&tscc_decoder);
     register_avcodec(&ulti_decoder);
     register_avcodec(&qdraw_decoder);
+    register_avcodec(&xl_decoder);
 #ifdef CONFIG_FAAD
     register_avcodec(&aac_decoder);
     register_avcodec(&mpeg4aac_decoder);

libavcodec/avcodec.h

@@ -17,7 +17,7 @@ extern "C" {
 
 #define FFMPEG_VERSION_INT     0x000409
 #define FFMPEG_VERSION         "0.4.9-pre1"
-#define LIBAVCODEC_BUILD       4727
+#define LIBAVCODEC_BUILD       4728
 
 #define LIBAVCODEC_VERSION_INT FFMPEG_VERSION_INT
 #define LIBAVCODEC_VERSION     FFMPEG_VERSION
@@ -104,6 +104,7 @@ enum CodecID {
     CODEC_ID_TSCC,
     CODEC_ID_ULTI,
     CODEC_ID_QDRAW,
+    CODEC_ID_VIXL,
 
     /* various pcm "codecs" */
     CODEC_ID_PCM_S16LE,
@@ -1890,6 +1891,7 @@ extern AVCodec flac_decoder;
 extern AVCodec tscc_decoder;
 extern AVCodec ulti_decoder;
 extern AVCodec qdraw_decoder;
+extern AVCodec xl_decoder;
 
 /* pcm codecs */
 #define PCM_CODEC(id, name) \

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,
+};

libavformat/avienc.c

@@ -169,6 +169,7 @@ const CodecTag codec_bmp_tags[] = {
     { CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', '1') },
     { CODEC_ID_TSCC, MKTAG('t', 's', 'c', 'c') },
     { CODEC_ID_ULTI, MKTAG('U', 'L', 'T', 'I') },
+    { CODEC_ID_VIXL, MKTAG('V', 'I', 'X', 'L') },
     { CODEC_ID_RAWVIDEO, 0 },
     { 0, 0 },
 };