[FFmpeg-devel] [PATCH] Add init_program_date_time so start time can be specified

[Dave Johansen <davejohansen@gmail.com>]

---
 doc/muxers.texi      | 3 +++
 libavformat/hlsenc.c | 7 ++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/doc/muxers.texi b/doc/muxers.texi
index f6071484ff..87c19a5cb9 100644
--- a/doc/muxers.texi
+++ b/doc/muxers.texi
@@ -1086,6 +1086,9 @@ seeking. This flag should be used with the @code{hls_time} option.
 @item program_date_time
 Generate @code{EXT-X-PROGRAM-DATE-TIME} tags.
 
+@item init_program_date_time
+Time to start program date time at.
+
 @item second_level_segment_index
 Makes it possible to use segment indexes as %%d in hls_segment_filename expression
 besides date/time values when strftime is on.
diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
index 4ef84c05c1..474322cc21 100644
--- a/libavformat/hlsenc.c
+++ b/libavformat/hlsenc.c
@@ -28,6 +28,8 @@
 #include <unistd.h>
 #endif
 
+#include "float.h"
+
 #include "libavutil/avassert.h"
 #include "libavutil/mathematics.h"
 #include "libavutil/avstring.h"
@@ -212,6 +214,8 @@ typedef struct HLSContext {
     int64_t recording_time;
     int64_t max_seg_size; // every segment file max size
 
+    double init_program_date_time;
+
     char *baseurl;
     char *vtt_format_options_str;
     char *subtitle_filename;
@@ -2867,7 +2871,7 @@ static int hls_init(AVFormatContext *s)
     char *p = NULL;
     int http_base_proto = ff_is_http_proto(s->url);
     int fmp4_init_filename_len = strlen(hls->fmp4_init_filename) + 1;
-    double initial_program_date_time = av_gettime() / 1000000.0;
+    double initial_program_date_time = hls->init_program_date_time ? hls->init_program_date_time : av_gettime() / 1000000.0;
 
     if (hls->use_localtime) {
         pattern = get_default_pattern_localtime_fmt(s);
@@ -3141,6 +3145,7 @@ static const AVOption options[] = {
     {"split_by_time", "split the hls segment by time which user set by hls_time", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SPLIT_BY_TIME }, 0, UINT_MAX,   E, "flags"},
     {"append_list", "append the new segments into old hls segment list", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_APPEND_LIST }, 0, UINT_MAX,   E, "flags"},
     {"program_date_time", "add EXT-X-PROGRAM-DATE-TIME", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_PROGRAM_DATE_TIME }, 0, UINT_MAX,   E, "flags"},
+    {"init_program_date_time", "Time to start program date time at", OFFSET(init_program_date_time), AV_OPT_TYPE_DOUBLE, {.dbl = 0 }, 0, DBL_MAX,   E},
     {"second_level_segment_index", "include segment index in segment filenames when use_localtime", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SECOND_LEVEL_SEGMENT_INDEX }, 0, UINT_MAX,   E, "flags"},
     {"second_level_segment_duration", "include segment duration in segment filenames when use_localtime", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SECOND_LEVEL_SEGMENT_DURATION }, 0, UINT_MAX,   E, "flags"},
     {"second_level_segment_size", "include segment size in segment filenames when use_localtime", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SECOND_LEVEL_SEGMENT_SIZE }, 0, UINT_MAX,   E, "flags"},
-- 
2.39.2 (Apple Git-143)

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