From e53698b08211a818e1fe924a532e142bbb64fc87 Mon Sep 17 00:00:00 2001
From: Martin Vignali <martin.vignali@gmail.com>
Date: Sat, 3 Oct 2015 15:39:41 +0200
Subject: [PATCH] add increment timecode option using segment.

---
 libavformat/segment.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/libavformat/segment.c b/libavformat/segment.c
index 36417f2..f3e1ab3 100644
--- a/libavformat/segment.c
+++ b/libavformat/segment.c
@@ -40,6 +40,7 @@
 #include "libavutil/parseutils.h"
 #include "libavutil/mathematics.h"
 #include "libavutil/time.h"
+#include "libavutil/timecode.h"
 #include "libavutil/time_internal.h"
 #include "libavutil/timestamp.h"
 
@@ -92,6 +93,7 @@ typedef struct SegmentContext {
     char *time_str;        ///< segment duration specification string
     int64_t time;          ///< segment duration
     int use_strftime;      ///< flag to expand filename with strftime
+    int increment_tc;      ///< flag for increment timecode if found
 
     char *times_str;       ///< segment times specification string
     int64_t *times;        ///< list of segment interval specification
@@ -221,6 +223,30 @@ static int segment_start(AVFormatContext *s, int write_header)
     SegmentContext *seg = s->priv_data;
     AVFormatContext *oc = seg->avf;
     int err = 0;
+    AVTimecode tc;
+    AVRational rate;
+    
+    if (seg->increment_tc){
+        AVDictionaryEntry * tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
+        if (tcr){
+            if (s->nb_streams > 0){
+                rate = s->streams[0]->avg_frame_rate;//Get fps from first stream
+                err = av_timecode_init_from_string(&tc, rate, tcr->value, s);
+                if (err < 0)
+                    return err;
+                tc.start += (int)(seg->time / 1000000.) * av_q2d(rate);//second count * fps
+                char buf[AV_TIMECODE_STR_SIZE];
+                av_dict_set(&s->metadata, "timecode",
+                            av_timecode_make_string(&tc, buf, 0), 0);//Set the new tc.
+            }
+            else{
+                av_log(s, AV_LOG_ERROR, "can't increment timecode. no stream found");
+            }
+        }
+        else{
+            av_log(s, AV_LOG_ERROR, "can't increment timecode. No timecode found");
+        }
+    }
 
     if (write_header) {
         avformat_free_context(oc);
@@ -935,6 +961,7 @@ static const AVOption options[] = {
     { "segment_start_number", "set the sequence number of the first segment", OFFSET(segment_idx), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
     { "segment_wrap_number", "set the number of wrap before the first segment", OFFSET(segment_idx_wrap_nb), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
     { "strftime",          "set filename expansion with strftime at segment creation", OFFSET(use_strftime), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, E },
+    { "increment_tc",          "increment timecode between each segment", OFFSET(increment_tc), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, E },
     { "break_non_keyframes", "allow breaking segments on non-keyframes", OFFSET(break_non_keyframes), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E },
 
     { "individual_header_trailer", "write header/trailer to each segment", OFFSET(individual_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E },
-- 
1.9.3 (Apple Git-50)