Reject large audio timestamp jumps before narrowing PLC packet counts

tools/chatgui/tests/test_stream_audio.cpp

@@ -68,6 +68,9 @@ static void test_silence_clock() {
         int length = opus_codec_encode(encoder, pcm, 960, packet, sizeof(packet)); CHECK(length > 0);
         CHECK(stream_playback_audio_feed(audio, 1000000 + i * 20000, packet, (size_t)length) == 0);
     }
+    int length = opus_codec_encode(encoder, pcm, 960, packet, sizeof(packet)); CHECK(length > 0);
+    CHECK(stream_playback_audio_feed(audio, INT64_MAX - 20000, packet, (size_t)length) == -2);
+    CHECK(stream_playback_audio_feed(audio, 1080000, packet, (size_t)length) == 0);
     int got = stream_playback_audio_pull(audio, out, 960, INT64_MAX); CHECK(got > 0);
     uint64_t before = stream_playback_audio_written(audio);
     int64_t pts = stream_playback_audio_position(audio, before);