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mp3: use simpler mp3 detection

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Signed-off-by: Mahyar Koshkouei <mk@deltabeard.com>
This commit is contained in:
Mahyar Koshkouei
2025-08-01 00:01:58 +01:00
parent fa723f311e
commit 8f7d7d6c0f
1 changed files with 33 additions and 0 deletions
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33
source/mp3.c
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@@ -141,6 +141,7 @@ void exitMp3(void)
*/ */
int isMp3(const char *path) int isMp3(const char *path)
{ {
#if 0
int err; int err;
int result = 1; int result = 1;
mpg123_handle *mh = NULL; mpg123_handle *mh = NULL;
@@ -156,6 +157,12 @@ int isMp3(const char *path)
if (!mh) if (!mh)
goto exit_init; goto exit_init;
// skip ID3v2 tags rather than parsing them (so tag-only files don’t count as valid mp3)
mpg123_param(mh, MPG123_SKIP_ID3V2, 1, 0);
// limit how many bytes to scan for a frame sync (e.g. 2048 bytes)
mpg123_param(mh, MPG123_RESYNC_LIMIT, 2048, 0);
// Try opening the file // Try opening the file
err = mpg123_open(mh, path); err = mpg123_open(mh, path);
if (err != MPG123_OK) if (err != MPG123_OK)
@@ -187,5 +194,31 @@ exit_init:
out: out:
return result; return result;
#else
unsigned char buf[4];
FILE *f = fopen(path, "rb");
int ret = 1;
if(!f) return 1;
if(fread(buf, 1, 4, f) < 4)
goto out;
// ID3v2 tag?
if(buf[0]=='I' && buf[1]=='D' && buf[2]=='3') {
ret = 0;
goto out;
}
// MPEG frame sync: 11 one-bits in a row
if(buf[0]==0xFF && (buf[1]&0xE0)==0xE0) {
ret = 0;
goto out;
}
out:
fclose(f);
return ret;
#endif
} }