X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fimgresample.c;h=ce1a05ce4b51e3203e191cf9365c3351312db21f;hb=486497e07b4617d9548a5b7347076f1b329bd417;hp=26de52d85760a83be2aa8dafe9d6a2411bf4ee7b;hpb=7b748aff2c84e97e04c5ce9fb2ec7684d52489ee;p=ffmpeg

diff --git a/libavcodec/imgresample.c b/libavcodec/imgresample.c
index 26de52d8576..ce1a05ce4b5 100644
--- a/libavcodec/imgresample.c
+++ b/libavcodec/imgresample.c
@@ -2,18 +2,20 @@
  * High quality image resampling with polyphase filters
  * Copyright (c) 2001 Fabrice Bellard.
  *
- * This library is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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,
+ * FFmpeg 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
+ * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
@@ -27,7 +29,7 @@
 #include "dsputil.h"
 
 #ifdef USE_FASTMEMCPY
-#include "fastmemcpy.h"
+#include "libvo/fastmemcpy.h"
 #endif
 
 #define NB_COMPONENTS 3
@@ -45,6 +47,11 @@
 
 #define LINE_BUF_HEIGHT (NB_TAPS * 4)
 
+struct SwsContext {
+    struct ImgReSampleContext *resampling_ctx;
+    enum PixelFormat src_pix_fmt, dst_pix_fmt;
+};
+
 struct ImgReSampleContext {
     int iwidth, iheight, owidth, oheight;
     int topBand, bottomBand, leftBand, rightBand;
@@ -164,7 +171,7 @@ static void v_resample(uint8_t *dst, int dst_width, const uint8_t *src,
         src_pos += src_incr;\
 }
 
-#define DUMP(reg) movq_r2m(reg, tmp); printf(#reg "=%016Lx\n", tmp.uq);
+#define DUMP(reg) movq_r2m(reg, tmp); printf(#reg "=%016"PRIx64"\n", tmp.uq);
 
 /* XXX: do four pixels at a time */
 static void h_resample_fast4_mmx(uint8_t *dst, int dst_width,
@@ -674,6 +681,42 @@ void sws_freeContext(struct SwsContext *ctx)
     av_free(ctx);
 }
 
+
+/**
+ * Checks if context is valid or reallocs a new one instead.
+ * If context is NULL, just calls sws_getContext() to get a new one.
+ * Otherwise, checks if the parameters are the same already saved in context.
+ * If that is the case, returns the current context.
+ * Otherwise, frees context and gets a new one.
+ *
+ * Be warned that srcFilter, dstFilter are not checked, they are
+ * asumed to remain valid.
+ */
+struct SwsContext *sws_getCachedContext(struct SwsContext *ctx,
+                        int srcW, int srcH, int srcFormat,
+                        int dstW, int dstH, int dstFormat, int flags,
+                        SwsFilter *srcFilter, SwsFilter *dstFilter, double *param)
+{
+    if (ctx != NULL) {
+        if ((ctx->resampling_ctx->iwidth != srcW) ||
+                        (ctx->resampling_ctx->iheight != srcH) ||
+                        (ctx->src_pix_fmt != srcFormat) ||
+                        (ctx->resampling_ctx->owidth != dstW) ||
+                        (ctx->resampling_ctx->oheight != dstH) ||
+                        (ctx->dst_pix_fmt != dstFormat))
+        {
+            sws_freeContext(ctx);
+            ctx = NULL;
+        }
+    }
+    if (ctx == NULL) {
+        return sws_getContext(srcW, srcH, srcFormat,
+                        dstW, dstH, dstFormat, flags,
+                        srcFilter, dstFilter, param);
+    }
+    return ctx;
+}
+
 int sws_scale(struct SwsContext *ctx, uint8_t* src[], int srcStride[],
               int srcSliceY, int srcSliceH, uint8_t* dst[], int dstStride[])
 {
@@ -684,7 +727,7 @@ int sws_scale(struct SwsContext *ctx, uint8_t* src[], int srcStride[],
     uint8_t *buf1 = NULL, *buf2 = NULL;
     enum PixelFormat current_pix_fmt;
 
-    for (i = 0; i < 3; i++) {
+    for (i = 0; i < 4; i++) {
         src_pict.data[i] = src[i];
         src_pict.linesize[i] = srcStride[i];
         dst_pict.data[i] = dst[i];
@@ -756,6 +799,9 @@ int sws_scale(struct SwsContext *ctx, uint8_t* src[], int srcStride[],
             res = -1;
             goto the_end;
         }
+    } else if (resampled_picture != &dst_pict) {
+        img_copy(&dst_pict, resampled_picture, current_pix_fmt,
+                        ctx->resampling_ctx->owidth, ctx->resampling_ctx->oheight);
     }
 
 the_end: