lavc/ccaption_dec: rename screen_changed to buffer_changed

libavcodec/ccaption_dec.c

@@ -123,7 +123,7 @@ typedef struct CCaptionSubContext {
     uint8_t cursor_color;
     uint8_t cursor_font;
     AVBPrint buffer;
-    int screen_changed;
+    int buffer_changed;
     int rollup;
     enum cc_mode mode;
     int64_t start_time;
@@ -365,7 +365,7 @@ static void handle_edm(CCaptionSubContext *ctx, int64_t pts)
 
     reap_screen(ctx, pts);
     screen->row_used = 0;
-    ctx->screen_changed = 1;
+    ctx->buffer_changed = 1;
 }
 
 static void handle_eoc(CCaptionSubContext *ctx, int64_t pts)
@@ -458,7 +458,7 @@ static void process_cc608(CCaptionSubContext *ctx, int64_t pts, uint8_t hi, uint
             ff_dlog(ctx, "carriage return\n");
             reap_screen(ctx, pts);
             roll_up(ctx);
-            ctx->screen_changed = 1;
+            ctx->buffer_changed = 1;
             ctx->cursor_column = 0;
             break;
         case 0x2f:
@@ -512,7 +512,7 @@ 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->screen_changed && *ctx->buffer.str)
+        if (ctx->buffer_changed && *ctx->buffer.str)
         {
             int start_time = av_rescale_q(ctx->start_time, avctx->time_base, ass_tb);
             int end_time = av_rescale_q(ctx->end_time, avctx->time_base, ass_tb);
@@ -521,7 +521,7 @@ 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->screen_changed = 0;
+            ctx->buffer_changed = 0;
             av_bprint_clear(&ctx->buffer);
         }
     }