[PATCH 5/5] stream_pvr: allow initial latency when opening stream

When opening an hdpvr device, there may be a significant delay before
first receiving data, especially at higher bitrates. This can cause
mplayer to assume EOF and exit.

Move the existing device polling code to a static function. Introduce
a new caller with generous 5 second timeout in pvr_stream_open.

Signed-off-by: Reza Arbab <[email protected]>
---
 stream/stream_pvr.c | 35 ++++++++++++++++++++++++++---------
 1 file changed, 26 insertions(+), 9 deletions(-)

diff --git a/stream/stream_pvr.c b/stream/stream_pvr.c
index 13c2f43..b35ba43 100644
--- a/stream/stream_pvr.c
+++ b/stream/stream_pvr.c
@@ -1597,6 +1597,26 @@ v4l2_display_settings (struct pvr_t *pvr)
   return 0;
 }
 
+static int
+poll_device (struct pvr_t *pvr, int timeout)
+{
+  struct pollfd pfds[1];
+  int ret;
+
+  pfds[0].fd = pvr->dev_fd;
+  pfds[0].events = POLLIN | POLLPRI;
+
+  ret = poll (pfds, 1, timeout);
+  if (!ret)
+  {
+    mp_msg (MSGT_OPEN, MSGL_WARN,
+            "%s %dms timeout polling stream device\n",
+            LOG_LEVEL_PVR, timeout);
+  }
+
+  return ret;
+}
+
 /* stream layer */
 
 static void
@@ -1614,7 +1634,6 @@ pvr_stream_close (stream_t *stream)
 static int
 pvr_stream_read (stream_t *stream, char *buffer, int size)
 {
-  struct pollfd pfds[1];
   struct pvr_t *pvr;
   int rk, fd, pos;
 
@@ -1630,15 +1649,9 @@ pvr_stream_read (stream_t *stream, char *buffer, int size)
 
   while (pos < size)
   {
-    pfds[0].fd = fd;
-    pfds[0].events = POLLIN | POLLPRI;
-
-    rk = poll (pfds, 1, 500);
-    if (!rk) {
-      mp_msg (MSGT_OPEN, MSGL_ERR,
-              "%s 500ms timeout polling stream device\n", LOG_LEVEL_PVR);
+    rk = poll_device (pvr, 500);
+    if (!rk)
       break;
-    }
     else if (rk < 0)
     {
       mp_msg (MSGT_OPEN, MSGL_ERR,
@@ -1762,6 +1775,10 @@ pvr_stream_open (stream_t *stream, int mode, void *opts, int *file_format)
     goto err_out;
   }
 
+  /* wait for device to begin streaming */
+  if (!poll_device (pvr, 5000))
+    goto err_out;
+
   stream->priv = pvr;
   stream->type = STREAMTYPE_PVR;
   stream->fill_buffer = pvr_stream_read;
-- 
2.5.0

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