- Advanced Intra Coding (AIC) support for H.263+ encoder, just DC by now.

- Bug fix H.263+ AIC tables.
- Warning fixes.

Originally committed as revision 431 to svn://svn.ffmpeg.org/ffmpeg/trunk

8 files changed, 254 insertions, 110 deletions

diff --git a/libavcodec/h263.c b/libavcodec/h263.c
index 7543264210..7661ab9f4d 100644
--- a/libavcodec/h263.c
+++ b/libavcodec/h263.c
@@ -46,6 +46,7 @@ static int h263_decode_block(MpegEncContext * s, DCTELEM * block,
                              int n, int coded);
 static int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
                               int n, int coded);
+static int h263_pred_dc(MpegEncContext * s, int n, UINT16 **dc_val_ptr);
 static inline int mpeg4_pred_dc(MpegEncContext * s, int n, UINT16 **dc_val_ptr, int *dir_ptr);
 static void mpeg4_inv_pred_ac(MpegEncContext * s, INT16 *block, int n,
                               int dir);
@@ -128,7 +129,7 @@ void h263_encode_picture_header(MpegEncContext * s, int picture_number)
         put_bits(&s->pb, 1, s->umvplus); /* Unrestricted Motion Vector */
         put_bits(&s->pb,1,0); /* SAC: off */
         put_bits(&s->pb,1,0); /* Advanced Prediction Mode: off */
-        put_bits(&s->pb,1,0); /* Advanced Intra Coding: off */
+        put_bits(&s->pb,1,s->h263_aic); /* Advanced Intra Coding */
         put_bits(&s->pb,1,0); /* Deblocking Filter: off */
         put_bits(&s->pb,1,0); /* Slice Structured: off */
         put_bits(&s->pb,1,0); /* Reference Picture Selection: off */
@@ -142,7 +143,11 @@ void h263_encode_picture_header(MpegEncContext * s, int picture_number)
 		
         put_bits(&s->pb,1,0); /* Reference Picture Resampling: off */
         put_bits(&s->pb,1,0); /* Reduced-Resolution Update: off */
-        put_bits(&s->pb,1,0); /* Rounding Type */
+        if (s->pict_type == I_TYPE)
+            s->no_rounding = 0;
+        else
+            s->no_rounding ^= 1;
+        put_bits(&s->pb,1,s->no_rounding); /* Rounding Type */
         put_bits(&s->pb,2,0); /* Reserved */
         put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
 		
@@ -539,10 +544,13 @@ void h263_encode_mb(MpegEncContext * s,
 		    int motion_x, int motion_y)
 {
     int cbpc, cbpy, i, cbp, pred_x, pred_y;
-   
-    //    printf("**mb x=%d y=%d\n", s->mb_x, s->mb_y);
+    INT16 pred_dc;
+    INT16 rec_intradc[6];
+    UINT16 *dc_ptr[6];
+           
+    //printf("**mb x=%d y=%d\n", s->mb_x, s->mb_y);
     if (!s->mb_intra) {
-	   /* compute cbp */
+        /* compute cbp */
         cbp = 0;
         for (i = 0; i < 6; i++) {
             if (s->block_last_index[i] >= 0)
@@ -553,16 +561,16 @@ void h263_encode_mb(MpegEncContext * s,
             put_bits(&s->pb, 1, 1);
             return;
         }
-        put_bits(&s->pb, 1, 0);    /* mb coded */
+        put_bits(&s->pb, 1, 0);	/* mb coded */
         cbpc = cbp & 3;
         put_bits(&s->pb,
-                 inter_MCBPC_bits[cbpc],
-                 inter_MCBPC_code[cbpc]);
+		    inter_MCBPC_bits[cbpc],
+		    inter_MCBPC_code[cbpc]);
         cbpy = cbp >> 2;
         cbpy ^= 0xf;
         put_bits(&s->pb, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
 
-       /* motion vectors: 16x16 mode only now */
+        /* motion vectors: 16x16 mode only now */
         h263_pred_motion(s, 0, &pred_x, &pred_y);
       
         if (!s->umvplus) {  
@@ -573,42 +581,132 @@ void h263_encode_mb(MpegEncContext * s,
             h263p_encode_umotion(s, motion_x - pred_x);
             h263p_encode_umotion(s, motion_y - pred_y);
             if (((motion_x - pred_x) == 1) && ((motion_y - pred_y) == 1))
-            /* To prevent Start Code emulation */
+                /* To prevent Start Code emulation */
                 put_bits(&s->pb,1,1);
         }
-   } else {
-	/* compute cbp */
-	cbp = 0;
-	for (i = 0; i < 6; i++) {
-	    if (s->block_last_index[i] >= 1)
-		cbp |= 1 << (5 - i);
-	}
+    } else {
+        int li = s->h263_aic ? 0 : 1;
+        
+        cbp = 0;
+        for(i=0; i<6; i++) {
+            /* Predict DC */
+            if (s->h263_aic && s->mb_intra) {
+                INT16 level = block[i][0];
+            
+                pred_dc = h263_pred_dc(s, i, &dc_ptr[i]);
+                level -= pred_dc;
+                /* Quant */
+                if (level < 0)
+                    level = (level + (s->qscale >> 1))/(s->y_dc_scale);
+                else
+                    level = (level - (s->qscale >> 1))/(s->y_dc_scale);
+                    
+                /* AIC can change CBP */
+                if (level == 0 && s->block_last_index[i] == 0)
+                    s->block_last_index[i] = -1;
+                else if (level < -127)
+                    level = -127;
+                else if (level > 127)
+                    level = 127;
+                
+                block[i][0] = level;
+                /* Reconstruction */ 
+                rec_intradc[i] = (s->y_dc_scale*level) + pred_dc;
+                /* Oddify */
+                rec_intradc[i] |= 1;
+                //if ((rec_intradc[i] % 2) == 0)
+                //    rec_intradc[i]++;
+                /* Clipping */
+                if (rec_intradc[i] < 0)
+                    rec_intradc[i] = 0;
+                else if (rec_intradc[i] > 2047)
+                    rec_intradc[i] = 2047;
+                                
+                /* Update AC/DC tables */
+                *dc_ptr[i] = rec_intradc[i];
+            }
+            /* compute cbp */
+            if (s->block_last_index[i] >= li)
+                cbp |= 1 << (5 - i);
+        }
 
-	cbpc = cbp & 3;
-	if (s->pict_type == I_TYPE) {
-	    put_bits(&s->pb,
-		     intra_MCBPC_bits[cbpc],
-		     intra_MCBPC_code[cbpc]);
-	} else {
-	    put_bits(&s->pb, 1, 0);	/* mb coded */
-	    put_bits(&s->pb,
-		     inter_MCBPC_bits[cbpc + 4],
-		     inter_MCBPC_code[cbpc + 4]);
-	}
-	if (s->h263_pred) {
-	    /* XXX: currently, we do not try to use ac prediction */
-	    put_bits(&s->pb, 1, 0);	/* no ac prediction */
-	}
-	cbpy = cbp >> 2;
-	put_bits(&s->pb, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
+        cbpc = cbp & 3;
+        if (s->pict_type == I_TYPE) {
+            put_bits(&s->pb,
+                intra_MCBPC_bits[cbpc],
+                intra_MCBPC_code[cbpc]);
+        } else {
+            put_bits(&s->pb, 1, 0);	/* mb coded */
+            put_bits(&s->pb,
+                inter_MCBPC_bits[cbpc + 4],
+                inter_MCBPC_code[cbpc + 4]);
+        }
+        if (s->h263_aic) {
+            /* XXX: currently, we do not try to use ac prediction */
+            put_bits(&s->pb, 1, 0);	/* no AC prediction */
+        }
+        cbpy = cbp >> 2;
+        put_bits(&s->pb, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
     }
 
-    /* encode each block */
-    for (i = 0; i < 6; i++) {
+    for(i=0; i<6; i++) {
+        /* encode each block */
         h263_encode_block(s, block[i], i);
+    
+        /* Update INTRADC for decoding */
+        if (s->h263_aic && s->mb_intra) {
+            block[i][0] = rec_intradc[i];
+            
+        }
+    }
+}
+
+static int h263_pred_dc(MpegEncContext * s, int n, UINT16 **dc_val_ptr)
+{
+    int x, y, wrap, a, c, pred_dc, scale;
+    INT16 *dc_val, *ac_val;
+
+    /* find prediction */
+    if (n < 4) {
+        x = 2 * s->mb_x + 1 + (n & 1);
+        y = 2 * s->mb_y + 1 + ((n & 2) >> 1);
+        wrap = s->mb_width * 2 + 2;
+        dc_val = s->dc_val[0];
+        ac_val = s->ac_val[0][0];
+        scale = s->y_dc_scale;
+    } else {
+        x = s->mb_x + 1;
+        y = s->mb_y + 1;
+        wrap = s->mb_width + 2;
+        dc_val = s->dc_val[n - 4 + 1];
+        ac_val = s->ac_val[n - 4 + 1][0];
+        scale = s->c_dc_scale;
     }
+    /* B C
+     * A X 
+     */
+    a = dc_val[(x - 1) + (y) * wrap];
+    c = dc_val[(x) + (y - 1) * wrap];
+    
+    /* No prediction outside GOB boundary */
+    if (s->first_gob_line && ((n < 2) || (n > 3)))
+        c = 1024;
+    pred_dc = 1024;
+    /* just DC prediction */
+    if (a != 1024 && c != 1024)
+        pred_dc = (a + c) >> 1;
+    else if (a != 1024)
+        pred_dc = a;
+    else
+        pred_dc = c;
+    
+    /* we assume pred is positive */
+    //pred_dc = (pred_dc + (scale >> 1)) / scale;
+    *dc_val_ptr = &dc_val[x + y * wrap];
+    return pred_dc;
 }
 
+
 void h263_pred_acdc(MpegEncContext * s, INT16 *block, int n)
 {
     int x, y, wrap, a, c, pred_dc, scale, i;
@@ -640,6 +738,9 @@ void h263_pred_acdc(MpegEncContext * s, INT16 *block, int n)
     a = dc_val[(x - 1) + (y) * wrap];
     c = dc_val[(x) + (y - 1) * wrap];
     
+    /* No prediction outside GOB boundary */
+    if (s->first_gob_line && ((n < 2) || (n > 3)))
+        c = 1024;
     pred_dc = 1024;
     if (s->ac_pred) {
         if (s->h263_aic_dir) {
@@ -898,6 +999,7 @@ void h263_encode_init(MpegEncContext *s)
 
         init_rl(&rl_inter);
         init_rl(&rl_intra);
+        init_rl(&rl_intra_aic);
 
         init_mv_penalty_and_fcode(s);
     }
@@ -928,11 +1030,11 @@ void h263_encode_init(MpegEncContext *s)
 
 static void h263_encode_block(MpegEncContext * s, DCTELEM * block, int n)
 {
-    int level, run, last, i, j, last_index, last_non_zero, sign, slevel;
-    int code;
-    RLTable *rl = &rl_inter;
+    int level, run, last, i, j, last_index, last_non_zero, sign, slevel, code;
+    RLTable *rl;
 
-    if (s->mb_intra) {
+    rl = &rl_inter;
+    if (s->mb_intra && !s->h263_aic) {
         /* DC coef */
 	    level = block[0];
         /* 255 cannot be represented, so we clamp */
@@ -952,23 +1054,25 @@ static void h263_encode_block(MpegEncContext * s, DCTELEM * block, int n)
 	    i = 1;
     } else {
 	    i = 0;
+	    if (s->h263_aic && s->mb_intra)
+	        rl = &rl_intra_aic;
     }
-
+   
     /* AC coefs */
     last_index = s->block_last_index[n];
     last_non_zero = i - 1;
     for (; i <= last_index; i++) {
-	j = zigzag_direct[i];
-	level = block[j];
-	if (level) {
-	    run = i - last_non_zero - 1;
-	    last = (i == last_index);
-	    sign = 0;
-	    slevel = level;
-	    if (level < 0) {
-		sign = 1;
-		level = -level;
-	    }
+        j = zigzag_direct[i];
+        level = block[j];
+        if (level) {
+            run = i - last_non_zero - 1;
+            last = (i == last_index);
+            sign = 0;
+            slevel = level;
+            if (level < 0) {
+                sign = 1;
+                level = -level;
+            }
             code = get_rl_index(rl, last, run, level);
             put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
             if (code == rl->n) {
@@ -978,8 +1082,8 @@ static void h263_encode_block(MpegEncContext * s, DCTELEM * block, int n)
             } else {
                 put_bits(&s->pb, 1, sign);
             }
-	    last_non_zero = i;
-	}
+	        last_non_zero = i;
+	    }
     }
 }
 
@@ -2628,7 +2732,7 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
             skip_bits(&s->gb, 8); // par_height
         }
 
-        if(vol_control=get_bits1(&s->gb)){ /* vol control parameter */
+        if ((vol_control=get_bits1(&s->gb))) { /* vol control parameter */
             int chroma_format= get_bits(&s->gb, 2);
             if(chroma_format!=1){
                 printf("illegal chroma format\n");
diff --git a/libavcodec/h263data.h b/libavcodec/h263data.h
index a129fd6bf5..c4342ffd37 100644
--- a/libavcodec/h263data.h
+++ b/libavcodec/h263data.h
@@ -125,45 +125,73 @@ static RLTable rl_inter = {
     inter_level,
 };
 
-/* table used for Advanced INTRA Coding, just RUN and LEVEL change */
-const INT8 inter_level_aic[102] = {
-  1,  1,  1,  1,  1,  1,  1,  1,
-  1,  3,  2,  1,  2,  2,  4,  5,
-  6,  7,  3,  2,  3,  4,  5,  2,
-  3,  4,  2,  3,  1,  2, 25,  1,
-  2, 24,  8,  2,  7,  4,  6,  1,
-  9, 23,  2,  3,  1, 10, 12, 11,
- 18, 17, 16, 15, 14, 13, 20, 19,
- 22, 21,  1,  1,  1,  1,  1,  1,
-  1,  2,  1,  1,  1,  3,  1,  1,
-  1,  1,  1,  1,  1,  4,  1,  1,
-  1,  1,  2,  2,  6,  5,  2,  2,
-  3,  7,  3,  4,  9,  8,  1,  1,
-  1,  2,  2,  2,  3, 10,
+const UINT16 intra_vlc_aic[103][2] = {
+{  0x2,  2 }, {  0x6,  3 }, {  0xe,  4 }, {  0xc,  5 }, 
+{  0xd,  5 }, { 0x10,  6 }, { 0x11,  6 }, { 0x12,  6 }, 
+{ 0x16,  7 }, { 0x1b,  8 }, { 0x20,  9 }, { 0x21,  9 }, 
+{ 0x1a,  9 }, { 0x1b,  9 }, { 0x1c,  9 }, { 0x1d,  9 }, 
+{ 0x1e,  9 }, { 0x1f,  9 }, { 0x23, 11 }, { 0x22, 11 }, 
+{ 0x57, 12 }, { 0x56, 12 }, { 0x55, 12 }, { 0x54, 12 }, 
+{ 0x53, 12 }, {  0xf,  4 }, { 0x14,  6 }, { 0x14,  7 }, 
+{ 0x1e,  8 }, {  0xf, 10 }, { 0x21, 11 }, { 0x50, 12 }, 
+{  0xb,  5 }, { 0x15,  7 }, {  0xe, 10 }, {  0x9, 10 }, 
+{ 0x15,  6 }, { 0x1d,  8 }, {  0xd, 10 }, { 0x51, 12 }, 
+{ 0x13,  6 }, { 0x23,  9 }, {  0x7, 11 }, { 0x17,  7 }, 
+{ 0x22,  9 }, { 0x52, 12 }, { 0x1c,  8 }, {  0xc, 10 }, 
+{ 0x1f,  8 }, {  0xb, 10 }, { 0x25,  9 }, {  0xa, 10 }, 
+{ 0x24,  9 }, {  0x6, 11 }, { 0x21, 10 }, { 0x20, 10 }, 
+{  0x8, 10 }, { 0x20, 11 }, {  0x7,  4 }, {  0xc,  6 }, 
+{ 0x10,  7 }, { 0x13,  8 }, { 0x11,  9 }, { 0x12,  9 }, 
+{  0x4, 10 }, { 0x27, 11 }, { 0x26, 11 }, { 0x5f, 12 }, 
+{  0xf,  6 }, { 0x13,  9 }, {  0x5, 10 }, { 0x25, 11 }, 
+{  0xe,  6 }, { 0x14,  9 }, { 0x24, 11 }, {  0xd,  6 }, 
+{  0x6, 10 }, { 0x5e, 12 }, { 0x11,  7 }, {  0x7, 10 }, 
+{ 0x13,  7 }, { 0x5d, 12 }, { 0x12,  7 }, { 0x5c, 12 }, 
+{ 0x14,  8 }, { 0x5b, 12 }, { 0x15,  8 }, { 0x1a,  8 }, 
+{ 0x19,  8 }, { 0x18,  8 }, { 0x17,  8 }, { 0x16,  8 }, 
+{ 0x19,  9 }, { 0x15,  9 }, { 0x16,  9 }, { 0x18,  9 }, 
+{ 0x17,  9 }, {  0x4, 11 }, {  0x5, 11 }, { 0x58, 12 }, 
+{ 0x59, 12 }, { 0x5a, 12 }, {  0x3,  7 },
 };
 
-const INT8 inter_run_aic[102] = {
-  0,  1,  3,  5,  7,  8,  9, 10,
- 11,  4,  9, 13,  0,  1,  1,  1,
-  1,  1,  0,  3,  2,  3,  0,  4,
-  3,  0,  5,  5,  2,  6,  0,  4,
-  7,  0,  0,  8,  0,  2,  0, 12,
-  0,  0,  2,  1,  6,  0,  0,  0,
-  0,  0,  0,  0,  0,  0,  0,  0,
-  0,  0,  0, 14, 20,  1, 19,  2,
-  3,  0,  5,  6,  4,  0,  9, 10,
- 11, 12, 13,  8,  7,  0, 17, 18,
- 16, 15,  2,  1,  0,  0,  4,  3,
-  1,  0,  2,  1,  0,  0, 21, 22,
- 23,  7,  6,  5,  3,  0,
+const INT8 intra_run_aic[102] = {
+ 0,  0,  0,  0,  0,  0,  0,  0, 
+ 0,  0,  0,  0,  0,  0,  0,  0, 
+ 0,  0,  0,  0,  0,  0,  0,  0, 
+ 0,  1,  1,  1,  1,  1,  1,  1, 
+ 2,  2,  2,  2,  3,  3,  3,  3, 
+ 4,  4,  4,  5,  5,  5,  6,  6, 
+ 7,  7,  8,  8,  9,  9, 10, 11, 
+12, 13,  0,  0,  0,  0,  0,  0, 
+ 0,  0,  0,  0,  1,  1,  1,  1, 
+ 2,  2,  2,  3,  3,  3,  4,  4, 
+ 5,  5,  6,  6,  7,  7,  8,  9, 
+10, 11, 12, 13, 14, 15, 16, 17, 
+18, 19, 20, 21, 22, 23, 
+};
+
+const INT8 intra_level_aic[102] = {
+ 1,  2,  3,  4,  5,  6,  7,  8, 
+ 9, 10, 11, 12, 13, 14, 15, 16, 
+17, 18, 19, 20, 21, 22, 23, 24, 
+25,  1,  2,  3,  4,  5,  6,  7, 
+ 1,  2,  3,  4,  1,  2,  3,  4, 
+ 1,  2,  3,  1,  2,  3,  1,  2, 
+ 1,  2,  1,  2,  1,  2,  1,  1, 
+ 1,  1,  1,  2,  3,  4,  5,  6, 
+ 7,  8,  9, 10,  1,  2,  3,  4, 
+ 1,  2,  3,  1,  2,  3,  1,  2, 
+ 1,  2,  1,  2,  1,  2,  1,  1, 
+ 1,  1,  1,  1,  1,  1,  1,  1, 
+ 1,  1,  1,  1,  1,  1,
 };
 
 static RLTable rl_intra_aic = {
     102,
     58,
-    inter_vlc,
-    inter_run_aic,
-    inter_level_aic,
+    intra_vlc_aic,
+    intra_run_aic,
+    intra_level_aic,
 };
 
 static const UINT16 h263_format[8][2] = {
@@ -174,4 +202,3 @@ static const UINT16 h263_format[8][2] = {
     { 704, 576 },
     { 1408, 1152 },
 };
-
diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index 1ab17b190b..7a0e0ab4dc 100644
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -28,7 +28,6 @@
 static int h263_decode_init(AVCodecContext *avctx)
 {
     MpegEncContext *s = avctx->priv_data;
-    int i;
 
     s->avctx = avctx;
     s->out_format = FMT_H263;
diff --git a/libavcodec/i386/mpegvideo_mmx.c b/libavcodec/i386/mpegvideo_mmx.c
index ebb5f36773..882272988a 100644
--- a/libavcodec/i386/mpegvideo_mmx.c
+++ b/libavcodec/i386/mpegvideo_mmx.c
@@ -557,12 +557,12 @@ void MPV_common_init_mmx(MpegEncContext *s)
         s->dct_unquantize_mpeg1 = dct_unquantize_mpeg1_mmx;
         s->dct_unquantize_mpeg2 = dct_unquantize_mpeg2_mmx;
 
-	draw_edges = draw_edges_mmx;
+        draw_edges = draw_edges_mmx;
 
-	if(mm_flags & MM_MMXEXT){
-	        dct_quantize= dct_quantize_MMX2;
-	}else{
-		dct_quantize= dct_quantize_MMX;
-	}
+        if(mm_flags & MM_MMXEXT){
+            dct_quantize= dct_quantize_MMX2;
+        } else {
+            dct_quantize= dct_quantize_MMX;
+        }
     }
 }
diff --git a/libavcodec/i386/mpegvideo_mmx_template.c b/libavcodec/i386/mpegvideo_mmx_template.c
index 3f9f9d78ee..ae72bcaa67 100644
--- a/libavcodec/i386/mpegvideo_mmx_template.c
+++ b/libavcodec/i386/mpegvideo_mmx_template.c
@@ -48,6 +48,7 @@ static int RENAME(dct_quantize)(MpegEncContext *s,
         else
             q = s->c_dc_scale;
         /* note: block[0] is assumed to be positive */
+        if (!s->h263_aic) {
 #if 1
         asm volatile (
         	"xorl %%edx, %%edx	\n\t"
@@ -65,6 +66,10 @@ static int RENAME(dct_quantize)(MpegEncContext *s,
         	: "%edx"
         );
 #endif
+        } else
+            /* For AIC we skip quant/dequant of INTRADC */
+            level = block[0];
+            
         block[0]=0; //avoid fake overflow
 //        temp_block[0] = (block[0] + (q >> 1)) / q;
         last_non_zero_p1 = 1;
diff --git a/libavcodec/i386/simple_idct_mmx.c b/libavcodec/i386/simple_idct_mmx.c
index 163097d4a9..32e3508f34 100644
--- a/libavcodec/i386/simple_idct_mmx.c
+++ b/libavcodec/i386/simple_idct_mmx.c
@@ -32,8 +32,8 @@
 #define ROW_SHIFT 11
 #define COL_SHIFT 20 // 6
 
-static uint64_t __attribute__((aligned(8))) wm1010= 0xFFFF0000FFFF0000ULL;
-static uint64_t __attribute__((aligned(8))) d40000= 0x0000000000040000ULL;
+static const uint64_t __attribute__((aligned(8))) wm1010= 0xFFFF0000FFFF0000ULL;
+static const uint64_t __attribute__((aligned(8))) d40000= 0x0000000000040000ULL;
 static int16_t __attribute__((aligned(8))) temp[64];
 static int16_t __attribute__((aligned(8))) coeffs[]= {
 	1<<(ROW_SHIFT-1), 0, 1<<(ROW_SHIFT-1), 0,
@@ -63,12 +63,12 @@ static int16_t __attribute__((aligned(8))) coeffs[]= {
  C3, -C1,  C3, -C1
 };
 
+#if 0
 static void unused_var_killer(){
 	int a= wm1010 + d40000;
 	temp[0]=a;
 }
 
-#if 0
 static void inline idctCol (int16_t * col, int16_t *input)
 {
 #undef C0
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 8b0f4f138f..75f51ffe1e 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -449,6 +449,7 @@ int MPV_encode_init(AVCodecContext *avctx)
         s->rtp_payload_size = 1200; 
         s->h263_plus = 1;
         s->unrestricted_mv = 1;
+        s->h263_aic = 1;
         
         /* These are just to be sure */
         s->umvplus = 0;
@@ -542,7 +543,7 @@ int MPV_encode_init(AVCodecContext *avctx)
     }
 
     /* precompute matrix */
-        /* for mjpeg, we do include qscale in the matrix */
+    /* for mjpeg, we do include qscale in the matrix */
     if (s->out_format != FMT_MJPEG) {
         convert_matrix(s->q_intra_matrix, s->q_intra_matrix16, s->q_intra_matrix16_bias, 
                        s->intra_matrix, s->intra_quant_bias);
@@ -1338,8 +1339,8 @@ static inline void clip_coeffs(MpegEncContext *s, DCTELEM *block, int last_index
     int i;
     const int maxlevel= s->max_qcoeff;
     const int minlevel= s->min_qcoeff;
-
-    for(i=0; i<=last_index; i++){
+        
+    for(i=0;i<=last_index; i++){
         const int j = zigzag_direct[i];
         int level = block[j];
        
@@ -1441,6 +1442,9 @@ static void encode_mb(MpegEncContext *s, int motion_x, int motion_y)
     /* DCT & quantize */
     if (s->h263_pred && s->msmpeg4_version!=2) {
         h263_dc_scale(s);
+    } else if (s->h263_aic) {
+        s->y_dc_scale = 2*s->qscale;
+        s->c_dc_scale = 2*s->qscale;
     } else {
         /* default quantization values */
         s->y_dc_scale = 8;
@@ -1450,14 +1454,16 @@ static void encode_mb(MpegEncContext *s, int motion_x, int motion_y)
         for(i=0;i<6;i++) {
             int overflow;
             s->block_last_index[i] = dct_quantize(s, s->block[i], i, 8, &overflow);
-            if(overflow) clip_coeffs(s, s->block[i], s->block_last_index[i]);
+            if (overflow) clip_coeffs(s, s->block[i], s->block_last_index[i]);
         }
     }else{
         for(i=0;i<6;i++) {
             int overflow;
             s->block_last_index[i] = dct_quantize(s, s->block[i], i, s->qscale, &overflow);
             // FIXME we could decide to change to quantizer instead of clipping
-            if(overflow) clip_coeffs(s, s->block[i], s->block_last_index[i]);
+            // JS: I don't think that would be a good idea it could lower quality instead
+            //     of improve it. Just INTRADC clipping deserves changes in quantizer
+            if (overflow) clip_coeffs(s, s->block[i], s->block_last_index[i]);
         }
     }
 
@@ -2018,12 +2024,16 @@ static int dct_quantize_c(MpegEncContext *s,
     block_permute(block);
 
     if (s->mb_intra) {
-        if (n < 4)
-            q = s->y_dc_scale;
-        else
-            q = s->c_dc_scale;
-        q = q << 3;
-        
+        if (!s->h263_aic) {
+            if (n < 4)
+                q = s->y_dc_scale;
+            else
+                q = s->c_dc_scale;
+            q = q << 3;
+        } else
+            /* For AIC we skip quant/dequant of INTRADC */
+            q = 1 << 3;
+            
         /* note: block[0] is assumed to be positive */
         block[0] = (block[0] + (q >> 1)) / q;
         i = 1;
diff --git a/libavcodec/rv10.c b/libavcodec/rv10.c
index 073fafaf2b..d358cb3d79 100644
--- a/libavcodec/rv10.c
+++ b/libavcodec/rv10.c
@@ -337,7 +337,6 @@ static int rv10_decode_picture_header(MpegEncContext *s)
 static int rv10_decode_init(AVCodecContext *avctx)
 {
     MpegEncContext *s = avctx->priv_data;
-    int i;
     static int done;
 
 //    s->avctx= avctx;