subs: move vobsub loading logic down to find_subfiles.c

Analogously to the previous commit, move path handling logic for
loading external vobsub files from mplayer.c to find_subfiles.c.

Based on a commit from Clément Bœsch but fixed and simplified.

bstr.c

@@ -62,6 +62,14 @@ int bstrchr(struct bstr str, int c)
     return -1;
 }
 
+int bstrrchr(struct bstr str, int c)
+{
+    for (int i = str.len - 1; i >= 0; i--)
+        if (str.start[i] == c)
+            return i;
+    return -1;
+}
+
 struct bstr bstr_strip(struct bstr str)
 {
     while (str.len && isspace(*str.start)) {

bstr.h

@@ -37,6 +37,7 @@ struct bstr {
 int bstrcmp(struct bstr str1, struct bstr str2);
 int bstrcasecmp(struct bstr str1, struct bstr str2);
 int bstrchr(struct bstr str, int c);
+int bstrrchr(struct bstr str, int c);
 struct bstr *bstr_splitlines(void *talloc_ctx, struct bstr str);
 struct bstr bstr_strip(struct bstr str);
 struct bstr bstr_split(struct bstr str, char *sep, struct bstr *rest);

mpcommon.h

@@ -25,6 +25,11 @@
 #define ROUND(x) ((int)((x) < 0 ? (x) - 0.5 : (x) + 0.5))
 
 #define MP_TALLOC_ELEMS(p) (talloc_get_size(p) / sizeof((p)[0]))
+#define MP_GROW_ARRAY(p, nextidx) do {          \
+    if ((nextidx) == MP_TALLOC_ELEMS(p))        \
+        p = talloc_realloc_size(NULL, p, talloc_get_size(p) * 2); } while (0)
+#define MP_RESIZE_ARRAY(ctx, p, count) do {     \
+        p = talloc_realloc_size((ctx), p, (count) * sizeof(p[0])); } while (0)
 
 extern const char *mplayer_version;
 

mplayer.c

@@ -4174,27 +4174,13 @@ if (edl_output_filename) {
         mp_tmsg(MSGT_CPLAYER,MSGL_ERR,"Cannot load subtitles: %s\n",
 		filename_recode(opts->vobsub_name));
     } else if (opts->sub_auto && mpctx->filename){
-      /* try to autodetect vobsub from movie filename ::atmos */
-      char *buf = strdup(mpctx->filename), *psub;
-      char *pdot = strrchr(buf, '.');
-      char *pslash = strrchr(buf, '/');
-#if defined(__MINGW32__) || defined(__CYGWIN__)
-      if (!pslash) pslash = strrchr(buf, '\\');
-#endif
-      if (pdot && (!pslash || pdot > pslash))
-        *pdot = '\0';
-      vo_vobsub=vobsub_open(buf,spudec_ifo,0,&vo_spudec);
-      /* try from ~/.mplayer/sub */
-      if(!vo_vobsub && (psub = get_path( "sub/" ))) {
-          const char *bname = mp_basename(buf);
-          int l;
-          l = strlen(psub) + strlen(bname) + 1;
-          psub = realloc(psub,l);
-          strcat(psub,bname);
-          vo_vobsub=vobsub_open(psub,spudec_ifo,0,&vo_spudec);
-          free(psub);
-      }
-      free(buf);
+        char **vob = find_vob_subtitles(mpctx->filename);
+        for (int i = 0; i < MP_TALLOC_ELEMS(vob); i++) {
+            vo_vobsub = vobsub_open(vob[i], spudec_ifo, 0, &vo_spudec);
+            if (vo_vobsub)
+                break;
+        }
+        talloc_free(vob);
     }
     if(vo_vobsub){
       mpctx->initialized_flags|=INITIALIZED_VOBSUB;

sub/find_subfiles.c

@@ -5,6 +5,7 @@
 
 #include "mp_msg.h"
 #include "path.h"
+#include "mpcommon.h"
 #include "sub/find_subfiles.h"
 #include "sub/sub.h"
 
@@ -278,3 +279,27 @@ char **find_text_subtitles(const char *fname)
     free(psub);
     return tmp;
 }
+
+char **find_vob_subtitles(const char *fname)
+{
+    char **vobs = talloc_array_ptrtype(NULL, vobs, 1);
+    int n = 0;
+
+    // Potential vobsub in the media directory
+    struct bstr bname = BSTR(mp_basename(fname));
+    int pdot = bstrrchr(bname, '.');
+    if (pdot >= 0)
+        bname.len = pdot;
+    vobs[n++] = mp_path_join(vobs, mp_dirname(fname), bname);
+
+    // Potential vobsub in ~/.mplayer/sub
+    char *mp_subdir = get_path("sub/");
+    if (mp_subdir) {
+        MP_GROW_ARRAY(vobs, n);
+        vobs[n++] = mp_path_join(vobs, BSTR(mp_subdir), bname);
+    }
+
+    free(mp_subdir);
+    MP_RESIZE_ARRAY(NULL, vobs, n);
+    return vobs;
+}

sub/find_subfiles.h

@@ -22,5 +22,6 @@
 #define MAX_SUBTITLE_FILES 128
 
 char **find_text_subtitles(const char *fname);
+char **find_vob_subtitles(const char *fname);
 
 #endif /* MPLAYER_FINDFILES_H */