[FFmpeg-devel] [PATCH 4/6] lavf: add support for loop points

[Rodger Combs]

---
 libavformat/avformat.h      | 12 ++++++++++++
 libavformat/options_table.h |  2 ++
 libavformat/utils.c         |  2 +-
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 719c23b..8158874 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -1799,6 +1799,18 @@ typedef struct AVFormatContext {
      * Demuxing: Set by user.
      */
     int (*open_cb)(struct AVFormatContext *s, AVIOContext **p, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options);
+
+    /**
+     * Suggested timestamps to start and end a loop at, in
+     * AV_TIME_BASE fractional seconds. AV_NOPTS_VALUE for loop_start indicates
+     * no looping. AV_NOPTS_VALUE for loop_end indicates the end of the file.
+     * loop_end before loop_start indicates ping-pong looping.
+     *
+     * - muxing: Set by user
+     * - demuxing: Set by avformat
+     */
+    int64_t loop_start;
+    int64_t loop_end;
 } AVFormatContext;
 
 int av_format_get_probe_score(const AVFormatContext *s);
diff --git a/libavformat/options_table.h b/libavformat/options_table.h
index 58670b0..8dec7e5 100644
--- a/libavformat/options_table.h
+++ b/libavformat/options_table.h
@@ -100,6 +100,8 @@ static const AVOption avformat_options[] = {
 {"dump_separator", "set information dump field separator", OFFSET(dump_separator), AV_OPT_TYPE_STRING, {.str = ", "}, CHAR_MIN, CHAR_MAX, D|E},
 {"codec_whitelist", "List of decoders that are allowed to be used", OFFSET(codec_whitelist), AV_OPT_TYPE_STRING, { .str = NULL },  CHAR_MIN, CHAR_MAX, D },
 {"format_whitelist", "List of demuxers that are allowed to be used", OFFSET(format_whitelist), AV_OPT_TYPE_STRING, { .str = NULL },  CHAR_MIN, CHAR_MAX, D },
+{"loop_start", "start time of a loop", OFFSET(loop_start), AV_OPT_TYPE_INT64, {.i64 = AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX, E},
+{"loop_end", "start time of a loop", OFFSET(loop_end), AV_OPT_TYPE_INT64, {.i64 = AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX, E},
 {NULL},
 };
 
diff --git a/libavformat/utils.c b/libavformat/utils.c
index caa15ab..36961f0 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -445,7 +445,7 @@ int avformat_open_input(AVFormatContext **ps, const char *filename,
         }
     }
 
-    s->duration = s->start_time = AV_NOPTS_VALUE;
+    s->duration = s->start_time = s->loop_start = s->loop_end = AV_NOPTS_VALUE;
     av_strlcpy(s->filename, filename ? filename : "", sizeof(s->filename));
 
     /* Allocate private data. */
-- 
2.4.1