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external_files: detect language tags with hyphens 

This loads subtitle files like foo.en-US.srt with --sub-auto=exact.

To preserve the case of these locales and not convert them to e.g.
en-us, stop lower casing filenames, and instead use case insensitive
functions to check if the media filename is contained in the external
filenames. Extensions, whitelisted cover art filenames and idx files
were already being compared case insensitively.

Fixes #12372, fixes #13251.
This commit is contained in:
Guido Cella 2024-04-18 18:08:17 +02:00
parent dac2a5881c
commit edc0ed902f
1 changed files with 26 additions and 11 deletions
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37
player/external_files.c
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@ -117,6 +117,7 @@ static struct bstr guess_lang_from_filename(struct bstr name, int *lang_start)
int lang_length = 0;
int i = name.len - 1;
int suffixes_length = 0;
char delimiter = '.';
if (name.start[i] == ')') {
@ -128,15 +129,31 @@ static struct bstr guess_lang_from_filename(struct bstr name, int *lang_start)
i--;
}
while (i >= 0 && mp_isalpha(name.start[i])) {
lang_length++;
if (lang_length > 3)
return (struct bstr){NULL, 0};
i--;
while (true) {
while (i >= 0 && mp_isalpha(name.start[i])) {
lang_length++;
i--;
}
// According to
// https://en.wikipedia.org/wiki/IETF_language_tag#Syntax_of_language_tags
// subtags after the first are composed of 1 to 8 letters.
if (lang_length < suffixes_length + 1 || lang_length > suffixes_length + 8)
return (struct bstr){0};
if (i >= 0 && name.start[i] == '-') {
lang_length++;
i--;
suffixes_length = lang_length;
} else {
break;
}
}
if (lang_length < 2 || i == 0 || name.start[i] != delimiter)
return (struct bstr){NULL, 0};
// The primary subtag can have 2 or 3 letters.
if (lang_length < suffixes_length + 2 || lang_length > suffixes_length + 3 ||
i == 0 || name.start[i] != delimiter)
return (struct bstr){0};
*lang_start = i;
return (struct bstr){name.start + i + 1, lang_length};
@ -162,7 +179,6 @@ static void append_dir_subtitles(struct mpv_global *global, struct MPOpts *opts,
struct bstr f_fname = mp_iconv_to_utf8(log, f_fbname,
"UTF-8-MAC", MP_NO_LATIN1_FALLBACK);
struct bstr f_fname_noext = bstrdup(tmpmem, bstr_strip_ext(f_fname));
bstr_lower(f_fname_noext);
struct bstr f_fname_trim = bstr_strip(f_fname_noext);
if (f_fbname.start != f_fname.start)
@ -185,7 +201,6 @@ static void append_dir_subtitles(struct mpv_global *global, struct MPOpts *opts,
"UTF-8-MAC", MP_NO_LATIN1_FALLBACK);
// retrieve various parts of the filename
struct bstr tmp_fname_noext = bstrdup(tmpmem2, bstr_strip_ext(dename));
bstr_lower(tmp_fname_noext);
struct bstr tmp_fname_ext = bstr_get_ext(dename);
struct bstr tmp_fname_trim = bstr_strip(tmp_fname_noext);
@ -217,13 +232,13 @@ static void append_dir_subtitles(struct mpv_global *global, struct MPOpts *opts,
// higher prio -> auto-selection may prefer it (0 = not loaded)
int prio = 0;
if (bstrcmp(tmp_fname_trim, f_fname_trim) == 0)
if (bstrcasecmp(tmp_fname_trim, f_fname_trim) == 0)
prio |= 32; // exact movie name match
bstr lang = {0};
int start = 0;
lang = guess_lang_from_filename(tmp_fname_trim, &start);
if (bstr_startswith(tmp_fname_trim, f_fname_trim)) {
if (bstr_case_startswith(tmp_fname_trim, f_fname_trim)) {
if (lang.len && start == f_fname_trim.len)
prio |= 16; // exact movie name + followed by lang