cache: assume file size from EOF position

If we're caching a stream with unknown size, and we reach EOF, then
consider the EOF position the file size. Typically makes sense when
reading from a pipe or a http connection that did not send a size.

(cherry picked from commit 3cd394995f812aba93166febd1032e3f4208d49b)

1 files changed, 8 insertions, 2 deletions

diff --git a/stream/cache.c b/stream/cache.c
index fafd76a4ab..edfe3ef4ab 100644
--- a/stream/cache.c
+++ b/stream/cache.c
@@ -102,6 +102,9 @@ struct priv {
     int64_t reads;          // number of actual read attempts performed
 
     int64_t read_filepos;   // client read position (mirrors cache->pos)
+
+    int64_t eof_pos;
+
     int control;            // requested STREAM_CTRL_... or CACHE_CTRL_...
     void *control_arg;      // temporary for executing STREAM_CTRLs
     int control_res;
@@ -277,8 +280,10 @@ done:
     s->eof = len <= 0;
     s->idle = s->eof;
     s->reads++;
-    if (s->eof)
+    if (s->eof) {
+        s->eof_pos = stream_tell(s->stream);
         MP_TRACE(s, "EOF reached.\n");
+    }
 
     pthread_cond_signal(&s->wakeup);
 
@@ -352,7 +357,7 @@ static void update_cached_controls(struct priv *s)
         talloc_free(s->stream_metadata);
         s->stream_metadata = talloc_steal(s, tags);
     }
-    s->stream_size = -1;
+    s->stream_size = s->eof_pos;
     if (stream_control(s->stream, STREAM_CTRL_GET_SIZE, &i64) == STREAM_OK)
         s->stream_size = i64;
     s->has_avseek = stream_control(s->stream, STREAM_CTRL_HAS_AVSEEK, NULL) > 0;
@@ -610,6 +615,7 @@ int stream_cache_init(stream_t *cache, stream_t *stream,
 
     struct priv *s = talloc_zero(NULL, struct priv);
     s->log = cache->log;
+    s->eof_pos = -1;
 
     cache_drop_contents(s);