Rename time stamp struct members

Renamed time stamp struct members to use consistent names for easy
understanding.

Change-Id: I568685cf43291e2bf5b74404cd6fabd2aeeb4192
diff --git a/av1/encoder/encode_strategy.c b/av1/encoder/encode_strategy.c
index 78c4f33..975f3bd 100644
--- a/av1/encoder/encode_strategy.c
+++ b/av1/encoder/encode_strategy.c
@@ -309,14 +309,14 @@
     return;
   }
 
-  if (ts_start == time_stamps->first_ever) {
+  if (ts_start == time_stamps->first_ts_start) {
     this_duration = ts_end - ts_start;
     step = 1;
   } else {
     int64_t last_duration =
-        time_stamps->prev_end_seen - time_stamps->prev_start_seen;
+        time_stamps->prev_ts_end - time_stamps->prev_ts_start;
 
-    this_duration = ts_end - time_stamps->prev_end_seen;
+    this_duration = ts_end - time_stamps->prev_ts_end;
 
     // do a step update if the duration changes by 10%
     if (last_duration)
@@ -331,7 +331,7 @@
       // frame rate. If we haven't seen 1 second yet, then average
       // over the whole interval seen.
       const double interval =
-          AOMMIN((double)(ts_end - time_stamps->first_ever), 10000000.0);
+          AOMMIN((double)(ts_end - time_stamps->first_ts_start), 10000000.0);
       double avg_duration = 10000000.0 / cpi->framerate;
       avg_duration *= (interval - avg_duration + this_duration);
       avg_duration /= interval;
@@ -339,8 +339,8 @@
       av1_new_framerate(cpi, 10000000.0 / avg_duration);
     }
   }
-  time_stamps->prev_start_seen = ts_start;
-  time_stamps->prev_end_seen = ts_end;
+  time_stamps->prev_ts_start = ts_start;
+  time_stamps->prev_ts_end = ts_end;
 }
 
 // Determine whether there is a forced keyframe pending in the lookahead buffer
@@ -1196,9 +1196,9 @@
 
   *time_stamp = source->ts_start;
   *time_end = source->ts_end;
-  if (source->ts_start < cpi->time_stamps.first_ever) {
-    cpi->time_stamps.first_ever = source->ts_start;
-    cpi->time_stamps.prev_end_seen = source->ts_start;
+  if (source->ts_start < cpi->time_stamps.first_ts_start) {
+    cpi->time_stamps.first_ts_start = source->ts_start;
+    cpi->time_stamps.prev_ts_end = source->ts_start;
   }
 
   av1_apply_encoding_flags(cpi, source->flags);
diff --git a/av1/encoder/encoder.c b/av1/encoder/encoder.c
index 41507e7..8ed9952 100644
--- a/av1/encoder/encoder.c
+++ b/av1/encoder/encoder.c
@@ -945,7 +945,7 @@
   av1_zero(aggregate_fc);
 #endif  // CONFIG_ENTROPY_STATS
 
-  cpi->time_stamps.first_ever = INT64_MAX;
+  cpi->time_stamps.first_ts_start = INT64_MAX;
 
 #ifdef OUTPUT_YUV_REC
   yuv_rec_file = fopen("rec.yuv", "wb");
@@ -1388,7 +1388,7 @@
       char results[512] = { 0 };
       FILE *f = fopen("opsnr.stt", "a");
       double time_encoded =
-          (cpi->time_stamps.prev_end_seen - cpi->time_stamps.first_ever) /
+          (cpi->time_stamps.prev_ts_end - cpi->time_stamps.first_ts_start) /
           10000000.000;
       double total_encode_time =
           (cpi->time_receive_data + cpi->time_compress_data) / 1000.000;
diff --git a/av1/encoder/encoder.h b/av1/encoder/encoder.h
index 8cfee7c..ed79ba0 100644
--- a/av1/encoder/encoder.h
+++ b/av1/encoder/encoder.h
@@ -1985,15 +1985,15 @@
   /*!
    * Start time stamp of the previous frame
    */
-  int64_t prev_start_seen;
+  int64_t prev_ts_start;
   /*!
    * End time stamp of the previous frame
    */
-  int64_t prev_end_seen;
+  int64_t prev_ts_end;
   /*!
    * Start time stamp of the first frame
    */
-  int64_t first_ever;
+  int64_t first_ts_start;
 } TimeStamps;
 
 /*!
diff --git a/av1/encoder/level.c b/av1/encoder/level.c
index a7005a3..7a74c46 100644
--- a/av1/encoder/level.c
+++ b/av1/encoder/level.c
@@ -1129,7 +1129,7 @@
       scan_past_frames(buffer, encoded_frames_in_last_second, level_spec,
                        level_stats);
       level_stats->total_time_encoded +=
-          (cpi->time_stamps.prev_end_seen - cpi->time_stamps.prev_start_seen) /
+          (cpi->time_stamps.prev_ts_end - cpi->time_stamps.prev_ts_start) /
           (double)TICKS_PER_SEC;
     }