port watermark vhook to swscaler

Patch by Victor Paesa %wzrlpy A arsystel P com%
Original thread + testcase:
Date: Sep 12, 2006 5:29 PM
Subject: Re: [Ffmpeg-devel] [PATCH] enable libswscale

Originally committed as revision 6649 to svn://svn.ffmpeg.org/ffmpeg/trunk

vhook/watermark.c

@@ -63,6 +63,9 @@
 
 #include "framehook.h"
 #include "cmdutils.h"
+#include "swscale.h"
+
+static int sws_flags = SWS_BICUBIC;
 
 typedef struct {
     char            filename[2000];
@@ -89,6 +92,13 @@ typedef struct {
     int             thrG;
     int             thrB;
     int             mode;
+
+    // This vhook first converts frame to RGB ...
+    struct SwsContext *toRGB_convert_ctx;
+    // ... then converts a watermark and applies it to the RGB frame ...
+    struct SwsContext *watermark_convert_ctx;
+    // ... and finally converts back frame from RGB to initial format
+    struct SwsContext *fromRGB_convert_ctx;
 } ContextInfo;
 
 int get_watermark_picture(ContextInfo *ci, int cleanup);
@@ -102,8 +112,12 @@ void Release(void *ctx)
     ContextInfo *ci;
     ci = (ContextInfo *) ctx;
 
-    if (ci) get_watermark_picture(ci, 1);
-
+    if (ci) {
+        get_watermark_picture(ci, 1);
+        sws_freeContext(ci->toRGB_convert_ctx);
+        sws_freeContext(ci->watermark_convert_ctx);
+        sws_freeContext(ci->fromRGB_convert_ctx);
+    }
     av_free(ctx);
 }
 
@@ -201,11 +215,24 @@ static void Process0(void *ctx,
         buf = av_malloc(size);
 
         avpicture_fill(&picture1, buf, PIX_FMT_RGBA32, src_width, src_height);
-        if (img_convert(&picture1, PIX_FMT_RGBA32,
-                        picture, pix_fmt, src_width, src_height) < 0) {
-            av_free(buf);
-            return;
+
+        // if we already got a SWS context, let's realloc if is not re-useable
+        ci->toRGB_convert_ctx = sws_getCachedContext(ci->toRGB_convert_ctx,
+                                    src_width, src_height, pix_fmt,
+                                    src_width, src_height, PIX_FMT_RGBA32,
+                                    sws_flags, NULL, NULL, NULL);
+        if (ci->toRGB_convert_ctx == NULL) {
+            av_log(NULL, AV_LOG_ERROR,
+                   "Cannot initialize the toRGB conversion context\n");
+            exit(1);
         }
+
+// img_convert parameters are          2 first destination, then 4 source
+// sws_scale   parameters are context, 4 first source,      then 2 destination
+        sws_scale(ci->toRGB_convert_ctx,
+                 picture->data, picture->linesize, 0, src_height,
+                 picture1.data, picture1.linesize);
+
         pict = &picture1;
     }
 
@@ -265,9 +292,20 @@ static void Process0(void *ctx,
 
 
     if (pix_fmt != PIX_FMT_RGBA32) {
-        if (img_convert(picture, pix_fmt,
-                        &picture1, PIX_FMT_RGBA32, src_width, src_height) < 0) {
+        ci->fromRGB_convert_ctx = sws_getCachedContext(ci->fromRGB_convert_ctx,
+                                      src_width, src_height, PIX_FMT_RGBA32,
+                                      src_width, src_height, pix_fmt,
+                                      sws_flags, NULL, NULL, NULL);
+        if (ci->fromRGB_convert_ctx == NULL) {
+            av_log(NULL, AV_LOG_ERROR,
+                   "Cannot initialize the fromRGB conversion context\n");
+            exit(1);
         }
+// img_convert parameters are          2 first destination, then 4 source
+// sws_scale   parameters are context, 4 first source,      then 2 destination
+        sws_scale(ci->fromRGB_convert_ctx,
+                 picture1.data, picture1.linesize, 0, src_height,
+                 picture->data, picture->linesize);
     }
 
     av_free(buf);
@@ -308,11 +346,24 @@ static void Process1(void *ctx,
         buf = av_malloc(size);
 
         avpicture_fill(&picture1, buf, PIX_FMT_RGBA32, src_width, src_height);
-        if (img_convert(&picture1, PIX_FMT_RGBA32,
-                        picture, pix_fmt, src_width, src_height) < 0) {
-            av_free(buf);
-            return;
+
+        // if we already got a SWS context, let's realloc if is not re-useable
+        ci->toRGB_convert_ctx = sws_getCachedContext(ci->toRGB_convert_ctx,
+                                    src_width, src_height, pix_fmt,
+                                    src_width, src_height, PIX_FMT_RGBA32,
+                                    sws_flags, NULL, NULL, NULL);
+        if (ci->toRGB_convert_ctx == NULL) {
+            av_log(NULL, AV_LOG_ERROR,
+                   "Cannot initialize the toRGB conversion context\n");
+            exit(1);
         }
+
+// img_convert parameters are          2 first destination, then 4 source
+// sws_scale   parameters are context, 4 first source,      then 2 destination
+        sws_scale(ci->toRGB_convert_ctx,
+                 picture->data, picture->linesize, 0, src_height,
+                 picture1.data, picture1.linesize);
+
         pict = &picture1;
     }
 
@@ -352,9 +403,20 @@ static void Process1(void *ctx,
     } // foreach Y
 
     if (pix_fmt != PIX_FMT_RGBA32) {
-        if (img_convert(picture, pix_fmt,
-                        &picture1, PIX_FMT_RGBA32, src_width, src_height) < 0) {
+        ci->fromRGB_convert_ctx = sws_getCachedContext(ci->fromRGB_convert_ctx,
+                                      src_width, src_height, PIX_FMT_RGBA32,
+                                      src_width, src_height, pix_fmt,
+                                      sws_flags, NULL, NULL, NULL);
+        if (ci->fromRGB_convert_ctx == NULL) {
+            av_log(NULL, AV_LOG_ERROR,
+                   "Cannot initialize the fromRGB conversion context\n");
+            exit(1);
         }
+// img_convert parameters are          2 first destination, then 4 source
+// sws_scale   parameters are context, 4 first source,      then 2 destination
+        sws_scale(ci->fromRGB_convert_ctx,
+                 picture1.data, picture1.linesize, 0, src_height,
+                 picture->data, picture->linesize);
     }
 
     av_free(buf);
@@ -540,9 +602,21 @@ int get_watermark_picture(ContextInfo *ci, int cleanup)
                 if(ci->frameFinished)
                 {
                     // Convert the image from its native format to RGBA32
-                    img_convert((AVPicture *)ci->pFrameRGB, PIX_FMT_RGBA32,
-                        (AVPicture*)(ci->pFrame), ci->pCodecCtx->pix_fmt, ci->pCodecCtx->width,
-                        ci->pCodecCtx->height);
+                    ci->watermark_convert_ctx =
+                        sws_getCachedContext(ci->watermark_convert_ctx,
+                            ci->pCodecCtx->width, ci->pCodecCtx->height, ci->pCodecCtx->pix_fmt,
+                            ci->pCodecCtx->width, ci->pCodecCtx->height, PIX_FMT_RGBA32,
+                            sws_flags, NULL, NULL, NULL);
+                    if (ci->watermark_convert_ctx == NULL) {
+                        av_log(NULL, AV_LOG_ERROR,
+                              "Cannot initialize the watermark conversion context\n");
+                        exit(1);
+                    }
+// img_convert parameters are          2 first destination, then 4 source
+// sws_scale   parameters are context, 4 first source,      then 2 destination
+                    sws_scale(ci->watermark_convert_ctx,
+                             ci->pFrame->data, ci->pFrame->linesize, 0, ci->pCodecCtx->height,
+                             ci->pFrameRGB->data, ci->pFrameRGB->linesize);
 
                     // Process the video frame (save to disk etc.)
                     //fprintf(stderr,"banan() New frame!\n");