[FFmpeg-devel] [PATCH] avformat/hls: Add option to retry failed segments for hls

[gnattu]

Current HLS implementation simply skip a failed segment to catch up
the stream, but this is not optimal for some use cases like livestream recording.
Add an option to retry a failed segment to ensure the output file is a complete stream.

Signed-off-by: gnattu <gnattuoc at me.com>
---
libavformat/hls.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/libavformat/hls.c b/libavformat/hls.c
index e622425e80..2b977f9132 100644
--- a/libavformat/hls.c
+++ b/libavformat/hls.c
@@ -225,6 +225,7 @@ typedef struct HLSContext {
  int http_persistent;
  int http_multiple;
  int http_seekable;
+    int seg_max_retry;
  AVIOContext *playlist_pb;
  HLSCryptoContext  crypto_ctx;
} HLSContext;
@@ -1472,6 +1473,7 @@ static int read_data(void *opaque, uint8_t *buf, int buf_size)
  int ret;
  int just_opened = 0;
  int reload_count = 0;
+    int segment_retries = 0;
  struct segment *seg;

restart:
@@ -1563,9 +1565,18 @@ reload:
          av_log(v->parent, AV_LOG_WARNING, "Failed to open segment %"PRId64" of playlist %d\n",
                 v->cur_seq_no,
                 v->index);
-            v->cur_seq_no += 1;
+            if (segment_retries >= c->seg_max_retry) {
+                av_log(v->parent, AV_LOG_WARNING, "Segment %"PRId64" of playlist %d failed too many times, skipping\n",
+                       v->cur_seq_no,
+                       v->index);
+                v->cur_seq_no += 1;
+                segment_retries = 0;
+            } else {
+                segment_retries += 1;
+            }
          goto reload;
      }
+        segment_retries = 0;
      just_opened = 1;
  }

@@ -2549,6 +2560,8 @@ static const AVOption hls_options[] = {
      OFFSET(http_seekable), AV_OPT_TYPE_BOOL, { .i64 = -1}, -1, 1, FLAGS},
  {"seg_format_options", "Set options for segment demuxer",
      OFFSET(seg_format_opts), AV_OPT_TYPE_DICT, {.str = NULL}, 0, 0, FLAGS},
+    {"seg_max_retry", "Maximum number of times to reload a segment on error.",
+     OFFSET(seg_max_retry), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS},
  {NULL}
};

-- 
2.37.0 (Apple Git-136)