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flvmux: Return NEED_DATA when we drop a buffer

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When we are dropping a buffer in find_best_pad (e.g. waiting for a
keyframe, or skipping backwards timestamp), return
GST_AGGREGATOR_FLOW_NEED_DATA to make sure we have enough data at the
next run. Otherwise, a stream that accidentally fell behind (e.g.
relinking race, or just waiting for a keyframe) will never get the
opportunity to catch up to the other one, because the other one will
always keep advancing.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/696>
This commit is contained in:
Vivia Nikolaidou 2020-08-10 20:20:53 +03:00
parent 75f6ca8a11
commit c95cc6a015
1 changed files with 30 additions and 7 deletions
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37
gst/flv/gstflvmux.c
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@ -1850,7 +1850,8 @@ gst_flv_mux_rewrite_header (GstFlvMux * mux)
/* Returns NULL, or a reference to the pad with the
* buffer with lowest running time */
static GstFlvMuxPad *
gst_flv_mux_find_best_pad (GstAggregator * aggregator, GstClockTime * ts)
gst_flv_mux_find_best_pad (GstAggregator * aggregator, GstClockTime * ts,
gboolean timeout)
{
GstFlvMuxPad *best = NULL;
GstBuffer *buffer;
@ -1871,8 +1872,16 @@ gst_flv_mux_find_best_pad (GstAggregator * aggregator, GstClockTime * ts)
gint64 t = GST_CLOCK_TIME_NONE;
buffer = gst_aggregator_pad_peek_buffer (apad);
if (!buffer)
continue;
if (!buffer) {
if (timeout || GST_PAD_IS_EOS (apad)) {
continue;
} else {
if (best)
gst_object_replace ((GstObject **) & best, NULL);
best_ts = GST_CLOCK_TIME_NONE;
break;
}
}
if (fpad->drop_deltas) {
if (mux->skip_backwards_streams
@ -1881,7 +1890,14 @@ gst_flv_mux_find_best_pad (GstAggregator * aggregator, GstClockTime * ts)
"Dropped buffer %" GST_PTR_FORMAT " until keyframe", buffer);
gst_buffer_unref (buffer);
gst_aggregator_pad_drop_buffer (apad);
continue;
if (timeout) {
continue;
} else {
if (best)
gst_object_replace ((GstObject **) & best, NULL);
best_ts = GST_CLOCK_TIME_NONE;
break;
}
} else {
/* drop-deltas is set and the buffer isn't delta, drop flag */
fpad->drop_deltas = FALSE;
@ -1902,7 +1918,14 @@ gst_flv_mux_find_best_pad (GstAggregator * aggregator, GstClockTime * ts)
gst_aggregator_pad_drop_buffer (apad);
/* Look for non-delta buffer */
fpad->drop_deltas = TRUE;
continue;
if (timeout) {
continue;
} else {
if (best)
gst_object_replace ((GstObject **) & best, NULL);
best_ts = GST_CLOCK_TIME_NONE;
break;
}
}
}
@ -1958,7 +1981,7 @@ gst_flv_mux_aggregate (GstAggregator * aggregator, gboolean timeout)
return GST_FLOW_ERROR;
}
best = gst_flv_mux_find_best_pad (aggregator, &ts);
best = gst_flv_mux_find_best_pad (aggregator, &ts, timeout);
if (!best) {
if (!gst_flv_mux_are_all_pads_eos (mux))
return GST_AGGREGATOR_FLOW_NEED_DATA;
@ -1981,7 +2004,7 @@ gst_flv_mux_aggregate (GstAggregator * aggregator, gboolean timeout)
mux->first_timestamp = 0;
}
} else {
best = gst_flv_mux_find_best_pad (aggregator, &ts);
best = gst_flv_mux_find_best_pad (aggregator, &ts, timeout);
}
if (mux->new_tags && mux->streamable) {