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

[Gnattu OC]

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)