+void ctf_update_current_packet_index(struct ctf_stream_definition *stream,
+ struct packet_index *prev_index,
+ struct packet_index *cur_index)
+{
+ uint64_t events_discarded_diff;
+ uint64_t packets_lost_diff = 0;
+
+ /* Update packet index time information */
+
+ /* Current packet begin/end */
+ stream->current.real.begin =
+ cur_index->ts_real.timestamp_begin;
+ stream->current.cycles.begin =
+ cur_index->ts_cycles.timestamp_begin;
+ stream->current.real.end =
+ cur_index->ts_real.timestamp_end;
+ stream->current.cycles.end =
+ cur_index->ts_cycles.timestamp_end;
+
+ /* Update packet index discarded event information */
+ events_discarded_diff = cur_index->events_discarded;
+ if (prev_index) {
+ /* Previous packet begin/end */
+ stream->prev.cycles.begin =
+ prev_index->ts_cycles.timestamp_begin;
+ stream->prev.real.begin =
+ prev_index->ts_real.timestamp_begin;
+ stream->prev.cycles.end =
+ prev_index->ts_cycles.timestamp_end;
+ stream->prev.real.end =
+ prev_index->ts_real.timestamp_end;
+
+ events_discarded_diff -= prev_index->events_discarded;
+ /* packet_seq_num stays at 0 if not produced by the tracer */
+ if (cur_index->packet_seq_num) {
+ packets_lost_diff = cur_index->packet_seq_num -
+ prev_index->packet_seq_num - 1;
+ }
+ /*
+ * Deal with 32-bit wrap-around if the tracer provided a
+ * 32-bit field.
+ */
+ if (prev_index->events_discarded_len == 32) {
+ events_discarded_diff = (uint32_t) events_discarded_diff;
+ }
+ } else {
+ /*
+ * First packet: use current packet info as limits for
+ * previous packet.
+ */
+ stream->prev.cycles.begin =
+ stream->prev.cycles.end =
+ stream->current.cycles.begin;
+ stream->prev.real.begin =
+ stream->prev.real.end =
+ stream->current.real.begin;
+ }
+ stream->events_discarded = events_discarded_diff;
+ stream->packets_lost = packets_lost_diff;
+}
+
+/*
+ * Find the timerange where all the streams in the trace are active
+ * simultaneously.
+ *
+ * Return 0 and update begin/end if necessary on success, return 1 for
+ * empty streams and return a negative value on error.
+ */
+static
+int ctf_intersect_trace(struct bt_trace_descriptor *td_read,
+ uint64_t *begin, uint64_t *end)
+{
+ struct ctf_trace *tin;
+ int stream_id, ret = 0;
+
+ tin = container_of(td_read, struct ctf_trace, parent);
+
+ for (stream_id = 0; stream_id < tin->streams->len;
+ stream_id++) {
+ int filenr;
+ struct ctf_stream_declaration *stream_class;
+
+ stream_class = g_ptr_array_index(tin->streams, stream_id);
+ if (!stream_class) {
+ continue;
+ }
+ for (filenr = 0; filenr < stream_class->streams->len; filenr++) {
+ struct ctf_file_stream *file_stream;
+ struct ctf_stream_pos *stream_pos;
+ struct packet_index *index;
+
+ file_stream = g_ptr_array_index(stream_class->streams,
+ filenr);
+ if (!file_stream) {
+ continue;
+ }
+ stream_pos = &file_stream->pos;
+ if (!stream_pos->packet_index ||
+ stream_pos->packet_index->len <= 0) {
+ ret = 1;
+ goto end;
+ }
+ index = &g_array_index(stream_pos->packet_index,
+ struct packet_index, 0);
+ if (index->ts_real.timestamp_begin > *begin) {
+ *begin = index->ts_real.timestamp_begin;
+ }
+ index = &g_array_index(stream_pos->packet_index,
+ struct packet_index,
+ stream_pos->packet_index->len - 1);
+ if (index->ts_real.timestamp_end < *end) {
+ *end = index->ts_real.timestamp_end;
+ }
+ }
+ }
+
+end:
+ return ret;
+}
+
+/*
+ * Find the timerange where all streams in the trace collection are active
+ * simultaneously.
+ *
+ * Return 0 on success.
+ * Return 1 if no intersections are found.
+ * Return a negative value on error.
+ */
+int ctf_find_packets_intersection(struct bt_context *ctx,
+ uint64_t *ts_begin, uint64_t *ts_end)
+{
+ int ret, i;
+
+ if (!ctx || !ctx->tc || !ctx->tc->array) {
+ ret = -EINVAL;
+ goto end;
+ }
+
+ for (i = 0; i < ctx->tc->array->len; i++) {
+ struct bt_trace_descriptor *td_read;
+
+ td_read = g_ptr_array_index(ctx->tc->array, i);
+ if (!td_read) {
+ continue;
+ }
+ ret = ctf_intersect_trace(td_read, ts_begin, ts_end);
+ if (ret) {
+ goto end;
+ }
+ }
+ if (*ts_end < *ts_begin) {
+ ret = 1;
+ } else {
+ ret = 0;
+ }
+end:
+ return ret;
+}
+