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While testing the [implementation for insertable streams] in `webrtcsink` & `webrtcsrc`, I encountered critical warnings, which turned out to result from two race conditions in `rtpsession`. Both race conditions produce: > GLib-CRITICAL: g_hash_table_foreach: > assertion 'version == hash_table->version' failed This commit fixes one of the race conditions observed. In its simplest form, the test consists in 2 pipelines and a Signalling server: * pipelines_sink: audiotestsrc ! webrtcsink * pipelines_src: webrtcsrc ! appsrc 1. Set `pipelines_sink` to `Playing`. 2. The Signalling server delivers the `producer_id`. 3. Initialize `pipelines_src` to establish a session with `producer_id`. 4. Set `pipelines_src` to `Playing`. 5. Wait for a buffer to be received by the `appsrc`. 6. Set `pipelines_src` to `Null`. 7. Set `pipelines_sink` to `Null`. The race condition happens in the following sequence: * `webrtcsink` runs a task to periodically retrieve statistics from `webrtcbin`. This transitively ends up executing `rtp_session_create_stats`. * `pipelines_sink` is set to `Null`. * In `Paused` to `Ready`, `gst_rtp_session_change_state()` calls `rtp_session_reset()`. * The assertion failure occurs when `rtp_session_reset` is called while `rtp_session_create_stats` is executing. This is because `rtp_session_create_stats` acquires the lock on `session` prior to calling `g_hash_table_foreach`, but `rtp_session_reset` doesn't acquire the lock before calling `g_hash_table_remove_all`. Acquiring the lock in `rtp_session_reset` fixes the issue. [implementing insertable streams support]: https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1176 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4528> |
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| gst-devtools | ||
| gst-docs | ||
| gst-editing-services | ||
| gst-examples | ||
| gst-integration-testsuites | ||
| gst-libav | ||
| gst-omx | ||
| gst-plugins-bad | ||
| gst-plugins-base | ||
| gst-plugins-good | ||
| gst-plugins-ugly | ||
| gst-python | ||
| gst-rtsp-server | ||
| gstreamer | ||
| gstreamer-sharp | ||
| gstreamer-vaapi | ||
| macos-bison-binary | ||
| packagefiles/pango-1.50.12 | ||
| win-flex-bison-binaries | ||
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| avtp.wrap | ||
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| fribidi.wrap | ||
| gl-headers.wrap | ||
| glib-networking.wrap | ||
| glib.wrap | ||
| graphene.wrap | ||
| gst-plugins-rs.wrap | ||
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| webrtc-audio-processing.wrap | ||
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