ffplay: rename decode_thread to read_thread, parse_tid to read_tid

The new names are less misleading and more reciprocally consistent.

ffplay.c

@@ -126,7 +126,7 @@ enum {
 };
 
 typedef struct VideoState {
-    SDL_Thread *parse_tid;
+    SDL_Thread *read_tid;
     SDL_Thread *video_tid;
     SDL_Thread *refresh_tid;
     AVInputFormat *iformat;
@@ -1270,7 +1270,7 @@ static void stream_close(VideoState *is)
     int i;
     /* XXX: use a special url_shutdown call to abort parse cleanly */
     is->abort_request = 1;
-    SDL_WaitThread(is->parse_tid, NULL);
+    SDL_WaitThread(is->read_tid, NULL);
     SDL_WaitThread(is->refresh_tid, NULL);
 
     /* free all pictures */
@@ -2366,7 +2366,7 @@ static int decode_interrupt_cb(void)
 }
 
 /* this thread gets the stream from the disk or the network */
-static int decode_thread(void *arg)
+static int read_thread(void *arg)
 {
     VideoState *is = arg;
     AVFormatContext *ic;
@@ -2637,8 +2637,8 @@ static VideoState *stream_open(const char *filename, AVInputFormat *iformat)
     is->subpq_cond = SDL_CreateCond();
 
     is->av_sync_type = av_sync_type;
-    is->parse_tid = SDL_CreateThread(decode_thread, is);
-    if (!is->parse_tid) {
+    is->read_tid = SDL_CreateThread(read_thread, is);
+    if (!is->read_tid) {
         av_free(is);
         return NULL;
     }