lavf: rename enc variable in utils.c:has_codec_parameters()

Rename it to "avctx", the old name was confusing as the function is
used also with decoder contexts.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavformat/utils.c

@@ -2044,29 +2044,29 @@ static void estimate_timings(AVFormatContext *ic, int64_t old_offset)
     }
 }
 
-static int has_codec_parameters(AVCodecContext *enc)
+static int has_codec_parameters(AVCodecContext *avctx)
 {
     int val;
-    switch(enc->codec_type) {
+    switch (avctx->codec_type) {
     case AVMEDIA_TYPE_AUDIO:
-        val = enc->sample_rate && enc->channels && enc->sample_fmt != AV_SAMPLE_FMT_NONE;
-        if(!enc->frame_size &&
-           (enc->codec_id == CODEC_ID_VORBIS ||
-            enc->codec_id == CODEC_ID_AAC ||
-            enc->codec_id == CODEC_ID_MP1 ||
-            enc->codec_id == CODEC_ID_MP2 ||
-            enc->codec_id == CODEC_ID_MP3 ||
-            enc->codec_id == CODEC_ID_SPEEX))
+        val = avctx->sample_rate && avctx->channels && avctx->sample_fmt != AV_SAMPLE_FMT_NONE;
+        if (!avctx->frame_size &&
+            (avctx->codec_id == CODEC_ID_VORBIS ||
+             avctx->codec_id == CODEC_ID_AAC ||
+             avctx->codec_id == CODEC_ID_MP1 ||
+             avctx->codec_id == CODEC_ID_MP2 ||
+             avctx->codec_id == CODEC_ID_MP3 ||
+             avctx->codec_id == CODEC_ID_SPEEX))
             return 0;
         break;
     case AVMEDIA_TYPE_VIDEO:
-        val = enc->width && enc->pix_fmt != PIX_FMT_NONE;
+        val = avctx->width && avctx->pix_fmt != PIX_FMT_NONE;
         break;
     default:
         val = 1;
         break;
     }
-    return enc->codec_id != CODEC_ID_NONE && val != 0;
+    return avctx->codec_id != CODEC_ID_NONE && val != 0;
 }
 
 static int has_decode_delay_been_guessed(AVStream *st)