Change PTS origin type from uint64_t to int64_t

It is initialized from AVPacket.pts, which is an int64_t.

app/src/recorder.c

@@ -11,8 +11,6 @@
 /** Downcast packet_sink to recorder */
 #define DOWNCAST(SINK) container_of(SINK, struct sc_recorder, packet_sink)
 
-#define SC_PTS_ORIGIN_NONE UINT64_C(-1)
-
 static const AVRational SCRCPY_TIME_BASE = {1, 1000000}; // timestamps in us
 
 static const AVOutputFormat *
@@ -171,7 +169,7 @@ run_recorder(void *data) {
 
         sc_mutex_unlock(&recorder->mutex);
 
-        if (recorder->pts_origin == SC_PTS_ORIGIN_NONE
+        if (recorder->pts_origin == AV_NOPTS_VALUE
                 && rec->packet->pts != AV_NOPTS_VALUE) {
             // First PTS received
             recorder->pts_origin = rec->packet->pts;
@@ -257,7 +255,7 @@ sc_recorder_open(struct sc_recorder *recorder, const AVCodec *input_codec) {
     recorder->failed = false;
     recorder->header_written = false;
     recorder->previous = NULL;
-    recorder->pts_origin = SC_PTS_ORIGIN_NONE;
+    recorder->pts_origin = AV_NOPTS_VALUE;
 
     const char *format_name = sc_recorder_get_format_name(recorder->format);
     assert(format_name);

app/src/recorder.h

@@ -28,7 +28,7 @@ struct sc_recorder {
     struct sc_size declared_frame_size;
     bool header_written;
 
-    uint64_t pts_origin;
+    int64_t pts_origin;
 
     sc_thread thread;
     sc_mutex mutex;