+static int pnm_magic_check(const AVProbeData *p, int magic)
+{
+ const uint8_t *b = p->buf;
+
+ return b[0] == 'P' && b[1] == magic + '0';
+}
+
+static inline int pnm_probe(const AVProbeData *p)
+{
+ const uint8_t *b = p->buf;
+
+ while (b[2] == '\r')
+ b++;
+ if (b[2] == '\n' && (b[3] == '#' || (b[3] >= '0' && b[3] <= '9')))
+ return AVPROBE_SCORE_EXTENSION + 2;
+ return 0;
+}
+
+static int pbm_probe(AVProbeData *p)
+{
+ return pnm_magic_check(p, 1) || pnm_magic_check(p, 4) ? pnm_probe(p) : 0;
+}
+
+static inline int pgmx_probe(AVProbeData *p)
+{
+ return pnm_magic_check(p, 2) || pnm_magic_check(p, 5) ? pnm_probe(p) : 0;
+}
+
+static int pgm_probe(AVProbeData *p)
+{
+ int ret = pgmx_probe(p);
+ return ret && !av_match_ext(p->filename, "pgmyuv") ? ret : 0;
+}
+
+static int pgmyuv_probe(AVProbeData *p) // custom FFmpeg format recognized by file extension
+{
+ int ret = pgmx_probe(p);
+ return ret && av_match_ext(p->filename, "pgmyuv") ? ret : 0;
+}
+
+static int ppm_probe(AVProbeData *p)
+{
+ return pnm_magic_check(p, 3) || pnm_magic_check(p, 6) ? pnm_probe(p) : 0;
+}
+
+static int pam_probe(AVProbeData *p)
+{
+ return pnm_magic_check(p, 7) ? pnm_probe(p) : 0;
+}
+