1 files changed, 15 insertions, 8 deletions

diff --git a/ffmpeg/libavcodec/ansi.c b/ffmpeg/libavcodec/ansi.c
index 93915f8..143b0aa 100644
--- a/ffmpeg/libavcodec/ansi.c
+++ b/ffmpeg/libavcodec/ansi.c
@@ -91,7 +91,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
     s->bg          = DEFAULT_BG_COLOR;
 
     if (!avctx->width || !avctx->height)
-        avcodec_set_dimensions(avctx, 80<<3, 25<<4);
+        ff_set_dimensions(avctx, 80 << 3, 25 << 4);
 
     return 0;
 }
@@ -116,7 +116,7 @@ static void hscroll(AVCodecContext *avctx)
     AnsiContext *s = avctx->priv_data;
     int i;
 
-    if (s->y < avctx->height - s->font_height) {
+    if (s->y <= avctx->height - 2*s->font_height) {
         s->y += s->font_height;
         return;
     }
@@ -169,7 +169,7 @@ static void draw_char(AVCodecContext *avctx, int c)
     ff_draw_pc_font(s->frame->data[0] + s->y * s->frame->linesize[0] + s->x,
                     s->frame->linesize[0], s->font, s->font_height, c, fg, bg);
     s->x += FONT_WIDTH;
-    if (s->x >= avctx->width) {
+    if (s->x > avctx->width - FONT_WIDTH) {
         s->x = 0;
         hscroll(avctx);
     }
@@ -182,7 +182,10 @@ static void draw_char(AVCodecContext *avctx, int c)
 static int execute_code(AVCodecContext * avctx, int c)
 {
     AnsiContext *s = avctx->priv_data;
-    int ret, i, width, height;
+    int ret, i;
+    int width  = avctx->width;
+    int height = avctx->height;
+
     switch(c) {
     case 'A': //Cursor Up
         s->y = FFMAX(s->y - (s->nb_args > 0 ? s->args[0]*s->font_height : s->font_height), 0);
@@ -205,8 +208,6 @@ static int execute_code(AVCodecContext * avctx, int c)
     case 'l': //reset screen mode
         if (s->nb_args < 2)
             s->args[0] = DEFAULT_SCREEN_MODE;
-        width = avctx->width;
-        height = avctx->height;
         switch(s->args[0]) {
         case 0: case 1: case 4: case 5: case 13: case 19: //320x200 (25 rows)
             s->font = avpriv_cga_font;
@@ -243,9 +244,13 @@ static int execute_code(AVCodecContext * avctx, int c)
         default:
             avpriv_request_sample(avctx, "Unsupported screen mode");
         }
+        s->x = av_clip(s->x, 0, width  - FONT_WIDTH);
+        s->y = av_clip(s->y, 0, height - s->font_height);
         if (width != avctx->width || height != avctx->height) {
             av_frame_unref(s->frame);
-            avcodec_set_dimensions(avctx, width, height);
+            ret = ff_set_dimensions(avctx, width, height);
+            if (ret < 0)
+                return ret;
             if ((ret = ff_get_buffer(avctx, s->frame,
                                      AV_GET_BUFFER_FLAG_REF)) < 0)
                 return ret;
@@ -336,6 +341,8 @@ static int execute_code(AVCodecContext * avctx, int c)
         avpriv_request_sample(avctx, "Unknown escape code");
         break;
     }
+    s->x = av_clip(s->x, 0, avctx->width  - FONT_WIDTH);
+    s->y = av_clip(s->y, 0, avctx->height - s->font_height);
     return 0;
 }
 
@@ -462,6 +469,7 @@ static av_cold int decode_close(AVCodecContext *avctx)
 
 AVCodec ff_ansi_decoder = {
     .name           = "ansi",
+    .long_name      = NULL_IF_CONFIG_SMALL("ASCII/ANSI art"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_ANSI,
     .priv_data_size = sizeof(AnsiContext),
@@ -469,5 +477,4 @@ AVCodec ff_ansi_decoder = {
     .close          = decode_close,
     .decode         = decode_frame,
     .capabilities   = CODEC_CAP_DR1,
-    .long_name      = NULL_IF_CONFIG_SMALL("ASCII/ANSI art"),
 };