From 98f949385c555b72e68db867969bf7bd3e642355 Mon Sep 17 00:00:00 2001
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From: Jeffy Chen <jeffy.chen@rock-chips.com>
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Date: Mon, 29 Nov 2021 14:49:25 +0800
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Subject: [PATCH 2/2] HACK: gstpad: Add 1 sec timeout for activation
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When using ghost pad, changing the activation mode might cause
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recursive waiting and hang the pipeline.
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It's hard to fix it without bring in new issues, let's just add a
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timeout as a workaround.
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Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
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---
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gst/gstpad.c | 22 ++++++++++++++++++++++
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1 file changed, 22 insertions(+)
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diff --git a/gst/gstpad.c b/gst/gstpad.c
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index bccba4e..1c43e1e 100644
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--- a/gst/gstpad.c
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+++ b/gst/gstpad.c
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@@ -964,6 +964,18 @@ gst_pad_mode_get_name (GstPadMode mode)
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return "unknown";
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}
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+static inline void
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+wait_activation_locked (GstPad * pad)
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+{
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+ /* HACK: 1 sec timeout for activation */
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+ for (gint i = 0; i < 1000; i++) {
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+ if (G_LIKELY (!pad->priv->in_activation))
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+ break;
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+
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+ g_usleep(1000);
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+ }
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+}
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+
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/* Returns TRUE if pad wasn't already in the new_mode */
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static gboolean
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pre_activate (GstPad * pad, GstPadMode new_mode)
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@@ -971,8 +983,13 @@ pre_activate (GstPad * pad, GstPadMode new_mode)
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switch (new_mode) {
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case GST_PAD_MODE_NONE:
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GST_OBJECT_LOCK (pad);
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+#if 0
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while (G_UNLIKELY (pad->priv->in_activation))
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g_cond_wait (&pad->priv->activation_cond, GST_OBJECT_GET_LOCK (pad));
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+#else
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+ if (G_UNLIKELY (pad->priv->in_activation))
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+ wait_activation_locked (pad);
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+#endif
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if (new_mode == GST_PAD_MODE (pad)) {
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GST_WARNING_OBJECT (pad,
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"Pad is already in the process of being deactivated");
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@@ -991,8 +1008,13 @@ pre_activate (GstPad * pad, GstPadMode new_mode)
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case GST_PAD_MODE_PUSH:
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case GST_PAD_MODE_PULL:
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GST_OBJECT_LOCK (pad);
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+#if 0
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while (G_UNLIKELY (pad->priv->in_activation))
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g_cond_wait (&pad->priv->activation_cond, GST_OBJECT_GET_LOCK (pad));
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+#else
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+ if (G_UNLIKELY (pad->priv->in_activation))
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+ wait_activation_locked (pad);
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+#endif
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if (new_mode == GST_PAD_MODE (pad)) {
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GST_WARNING_OBJECT (pad,
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"Pad is already in the process of being activated");
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--
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2.20.1
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