avformat: Add av_get_frame_filename2() and AV_FRAME_FILENAME_FLAGS_MULTIPLE

This will be used to allow writing file sequences using the tee output onto
multiple places in parallel
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

doc/APIchanges

@@ -15,6 +15,9 @@ libavutil:     2015-08-28
 
 API changes, most recent first:
 
+2016-08-04 - xxxxxxx - lavf 57.46.100 - avformat.h
+  Add av_get_frame_filename2()
+
 2016-07-09 - xxxxxxx / 90f469a - lavc 57.50.100 / 57.20.0 - avcodec.h
   Add FF_PROFILE_H264_MULTIVIEW_HIGH and FF_PROFILE_H264_STEREO_HIGH.
 

libavformat/avformat.h

@@ -2720,6 +2720,9 @@ void av_dump_format(AVFormatContext *ic,
                     const char *url,
                     int is_output);
 
+
+#define AV_FRAME_FILENAME_FLAGS_MULTIPLE 1 ///< Allow multiple %d
+
 /**
  * Return in 'buf' the path with '%d' replaced by a number.
  *
@@ -2730,8 +2733,12 @@ void av_dump_format(AVFormatContext *ic,
  * @param buf_size destination buffer size
  * @param path numbered sequence string
  * @param number frame number
+ * @param flags AV_FRAME_FILENAME_FLAGS_*
  * @return 0 if OK, -1 on format error
  */
+int av_get_frame_filename2(char *buf, int buf_size,
+                          const char *path, int number, int flags);
+
 int av_get_frame_filename(char *buf, int buf_size,
                           const char *path, int number);
 

libavformat/utils.c

@@ -4315,7 +4315,7 @@ uint64_t ff_ntp_time(void)
     return (av_gettime() / 1000) * 1000 + NTP_OFFSET_US;
 }
 
-int av_get_frame_filename(char *buf, int buf_size, const char *path, int number)
+int av_get_frame_filename2(char *buf, int buf_size, const char *path, int number, int flags)
 {
     const char *p;
     char *q, buf1[20], c;
@@ -4340,7 +4340,7 @@ int av_get_frame_filename(char *buf, int buf_size, const char *path, int number)
             case '%':
                 goto addchar;
             case 'd':
-                if (percentd_found)
+                if (!(flags & AV_FRAME_FILENAME_FLAGS_MULTIPLE) && percentd_found)
                     goto fail;
                 percentd_found = 1;
                 if (number < 0)
@@ -4370,6 +4370,11 @@ fail:
     return -1;
 }
 
+int av_get_frame_filename(char *buf, int buf_size, const char *path, int number)
+{
+    return av_get_frame_filename2(buf, buf_size, path, number, 0);
+}
+
 void av_url_split(char *proto, int proto_size,
                   char *authorization, int authorization_size,
                   char *hostname, int hostname_size,

libavformat/version.h

@@ -32,7 +32,7 @@
 // Major bumping may affect Ticket5467, 5421, 5451(compatibility with Chromium)
 // Also please add any ticket numbers that you belive might be affected here
 #define LIBAVFORMAT_VERSION_MAJOR  57
-#define LIBAVFORMAT_VERSION_MINOR  45
+#define LIBAVFORMAT_VERSION_MINOR  46
 #define LIBAVFORMAT_VERSION_MICRO 100
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \