mpeg4dec: use unsigned type for startcode in ff_mpeg4_decode_picture_header

[ffmpeg] / libavcodec / alpha / mpegvideo_alpha.c

diff --git a/libavcodec/alpha/mpegvideo_alpha.c b/libavcodec/alpha/mpegvideo_alpha.c
index 350b53f62f7b6f2feb83e5ccbb051aa79598d9e3..add57364a3d0529739064fbda33779ec2e552245 100644 (file)
--- a/libavcodec/alpha/mpegvideo_alpha.c
+++ b/libavcodec/alpha/mpegvideo_alpha.c
@@ -2,58 +2,38 @@
  * Alpha optimized DSP utils
  * Copyright (c) 2002 Falk Hueffner <falk@debian.org>
  *
- * This library is free software; you can redistribute it and/or
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ * version 2.1 of the License, or (at your option) any later version.
  *
- * This library is distributed in the hope that it will be useful,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "libavcodec/dsputil.h"
+#include "libavcodec/mpegvideo.h"
 #include "asm.h"
-#include "../dsputil.h"
-#include "../mpegvideo.h"
 
-extern void simple_idct_put_axp(uint8_t *dest, int line_size, DCTELEM *block);
-extern void simple_idct_add_axp(uint8_t *dest, int line_size, DCTELEM *block);
-  
-static void dct_unquantize_h263_axp(MpegEncContext *s, DCTELEM *block,
-                                    int n, int qscale)
+static void dct_unquantize_h263_axp(DCTELEM *block, int n_coeffs,
+                                    uint64_t qscale, uint64_t qadd)
 {
-    int i, n_coeffs;
-    uint64_t qmul, qadd;
-    uint64_t correction;
-    DCTELEM *orig_block = block;
-    DCTELEM block0;
-
-    qadd = WORD_VEC((qscale - 1) | 1);
-    qmul = qscale << 1;
-    /* This mask kills spill from negative subwords to the next subword.  */ 
-    correction = WORD_VEC((qmul - 1) + 1); /* multiplication / addition */
-
-    if (s->mb_intra) {
-        if (!s->h263_aic) {
-            if (n < 4) 
-                block0 = block[0] * s->y_dc_scale;
-            else
-                block0 = block[0] * s->c_dc_scale;
-        } else {
-           qadd = 0;
-       }
-        n_coeffs = 63; // does not always use zigzag table 
-    } else {
-        n_coeffs = s->intra_scantable.raster_end[s->block_last_index[n]];
-    }
+    uint64_t qmul = qscale << 1;
+    uint64_t correction = WORD_VEC(qmul * 255 >> 8);
+    int i;
+
+    qadd = WORD_VEC(qadd);
 
     for(i = 0; i <= n_coeffs; block += 4, i += 4) {
-        uint64_t levels, negmask, zeros, add;
+        uint64_t levels, negmask, zeros, add, sub;
 
         levels = ldq(block);
         if (levels == 0)
@@ -62,7 +42,6 @@ static void dct_unquantize_h263_axp(MpegEncContext *s, DCTELEM *block,
 #ifdef __alpha_max__
         /* I don't think the speed difference justifies runtime
            detection.  */
-       ASM_ACCEPT_MVI;
         negmask = maxsw4(levels, -1); /* negative -> ffff (-1) */
         negmask = minsw4(negmask, 0); /* positive -> 0000 (0) */
 #else
@@ -79,24 +58,53 @@ static void dct_unquantize_h263_axp(MpegEncContext *s, DCTELEM *block,
         levels *= qmul;
         levels -= correction & (negmask << 16);
 
-        /* Negate qadd for negative levels.  */
-        add = qadd ^ negmask;
-        add += WORD_VEC(0x0001) & negmask;
+        add = qadd & ~negmask;
+        sub = qadd &  negmask;
         /* Set qadd to 0 for levels == 0.  */
         add = zap(add, zeros);
-
         levels += add;
+        levels -= sub;
 
         stq(levels, block);
     }
+}
+
+static void dct_unquantize_h263_intra_axp(MpegEncContext *s, DCTELEM *block,
+                                    int n, int qscale)
+{
+    int n_coeffs;
+    uint64_t qadd;
+    DCTELEM block0 = block[0];
 
-    if (s->mb_intra && !s->h263_aic)
-        orig_block[0] = block0;
+    if (!s->h263_aic) {
+        if (n < 4)
+            block0 *= s->y_dc_scale;
+        else
+            block0 *= s->c_dc_scale;
+        qadd = (qscale - 1) | 1;
+    } else {
+        qadd = 0;
+    }
+
+    if(s->ac_pred)
+        n_coeffs = 63;
+    else
+        n_coeffs = s->inter_scantable.raster_end[s->block_last_index[n]];
+
+    dct_unquantize_h263_axp(block, n_coeffs, qscale, qadd);
+
+    block[0] = block0;
+}
+
+static void dct_unquantize_h263_inter_axp(MpegEncContext *s, DCTELEM *block,
+                                    int n, int qscale)
+{
+    int n_coeffs = s->inter_scantable.raster_end[s->block_last_index[n]];
+    dct_unquantize_h263_axp(block, n_coeffs, qscale, (qscale - 1) | 1);
 }
 
 void MPV_common_init_axp(MpegEncContext *s)
 {
-    s->dct_unquantize_h263 = dct_unquantize_h263_axp;
-    s->idct_put = simple_idct_put_axp;
-    s->idct_add = simple_idct_add_axp;
+    s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_axp;
+    s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_axp;
 }