changed name of erase_display_memory to screen_changed

Signed-off-by: Anshul Maheshwari <er.anshul.maheshwari@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/ccaption_dec.c

@@ -157,7 +157,7 @@ typedef struct CCaptionSubContext {
     uint8_t cursor_color;
     uint8_t cursor_font;
     AVBPrint buffer;
-    int erase_display_memory;
+    int screen_changed;
     int rollup;
     enum  cc_mode mode;
     int64_t start_time;
@@ -355,7 +355,7 @@ static int handle_edm(CCaptionSubContext *ctx,int64_t pts)
 
     }
     ctx->startv_time = pts;
-    ctx->erase_display_memory = 1;
+    ctx->screen_changed = 1;
     ctx->end_time = pts;
     return ret;
 }
@@ -495,7 +495,7 @@ static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avp
             continue;
         else
             process_cc608(ctx, avpkt->pts, *(bptr + i + 1) & 0x7f, *(bptr + i + 2) & 0x7f);
-        if(ctx->erase_display_memory && *ctx->buffer.str)
+        if(ctx->screen_changed && *ctx->buffer.str)
         {
             int start_time = av_rescale_q(ctx->start_time, avctx->time_base, (AVRational){ 1, 100 });
             int end_time = av_rescale_q(ctx->end_time, avctx->time_base, (AVRational){ 1, 100 });
@@ -504,7 +504,7 @@ static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avp
             if (ret < 0)
                 return ret;
             sub->pts = av_rescale_q(ctx->start_time, avctx->time_base, AV_TIME_BASE_Q);
-            ctx->erase_display_memory = 0;
+            ctx->screen_changed = 0;
             av_bprint_clear(&ctx->buffer);
         }
     }