mp3parse: use proper total_time and total_bytes in various cases

The correct basis for (Xing, VBRI) seek table calculations is the
byte size and duration provided by that metadata, rather than some
other (possibly even estimated) one.  This also prevents an infinite
conversion loop in (unlikely) case where a TOC is provided without
such corresponding (duration) metdata.

diff --git a/gst/mpegaudioparse/gstmpegaudioparse.c b/gst/mpegaudioparse/gstmpegaudioparse.c
index 8f5996e..3dd4c36 100644 (file)
--- a/gst/mpegaudioparse/gstmpegaudioparse.c
+++ b/gst/mpegaudioparse/gstmpegaudioparse.c
@@ -1025,10 +1025,10 @@ gst_mp3parse_handle_first_frame (GstMPEGAudioParse * mp3parse)
       mp3parse->xing_bytes = 0;
     }
 
-    /* If we know the upstream size and duration, compute the 
+    /* If we know the upstream size and duration, compute the
      * total bitrate, rounded up to the nearest kbit/sec */
-    if (mp3parse_total_time (mp3parse, &total_time) &&
-        mp3parse_total_bytes (mp3parse, &total_bytes)) {
+    if ((total_time = mp3parse->xing_total_time) &&
+        (total_bytes = mp3parse->xing_bytes)) {
       mp3parse->xing_bitrate = gst_util_uint64_scale (total_bytes,
           8 * GST_SECOND, total_time);
       mp3parse->xing_bitrate += 500;
@@ -1141,8 +1141,8 @@ gst_mp3parse_handle_first_frame (GstMPEGAudioParse * mp3parse)
 
     /* If we know the upstream size and duration, compute the 
      * total bitrate, rounded up to the nearest kbit/sec */
-    if (mp3parse_total_time (mp3parse, &total_time) &&
-        mp3parse_total_bytes (mp3parse, &total_bytes)) {
+    if ((total_time = mp3parse->vbri_total_time) &&
+        (total_bytes = mp3parse->vbri_bytes)) {
       mp3parse->vbri_bitrate = gst_util_uint64_scale (total_bytes,
           8 * GST_SECOND, total_time);
       mp3parse->vbri_bitrate += 500;
@@ -1737,17 +1737,14 @@ mp3parse_time_to_bytepos (GstMPEGAudioParse * mp3parse, GstClockTime ts,
 
   /* If XING seek table exists use this for time->byte conversion */
   if ((mp3parse->xing_flags & XING_TOC_FLAG) &&
-      mp3parse_total_bytes (mp3parse, &total_bytes) &&
-      mp3parse_total_time (mp3parse, &total_time)) {
+      (total_bytes = mp3parse->xing_bytes) &&
+      (total_time = mp3parse->xing_total_time)) {
     gdouble fa, fb, fx;
     gdouble percent =
         CLAMP ((100.0 * gst_util_guint64_to_gdouble (ts)) /
         gst_util_guint64_to_gdouble (total_time), 0.0, 100.0);
     gint index = CLAMP (percent, 0, 99);
 
-    /* xing indicated size is preferred over e.g. truncated file size */
-    if (mp3parse->xing_bytes)
-      total_bytes = mp3parse->xing_bytes;
     fa = mp3parse->xing_seek_table[index];
     if (index < 99)
       fb = mp3parse->xing_seek_table[index + 1];
@@ -1761,15 +1758,11 @@ mp3parse_time_to_bytepos (GstMPEGAudioParse * mp3parse, GstClockTime ts,
     return TRUE;
   }
 
-  if (mp3parse->vbri_seek_table &&
-      mp3parse_total_bytes (mp3parse, &total_bytes) &&
-      mp3parse_total_time (mp3parse, &total_time)) {
+  if (mp3parse->vbri_seek_table && (total_bytes = mp3parse->vbri_bytes) &&
+      (total_time = mp3parse->vbri_total_time)) {
     gint i, j;
     gdouble a, b, fa, fb;
 
-    /* header indicated size is preferred over e.g. truncated file size */
-    if (mp3parse->vbri_bytes)
-      total_bytes = mp3parse->vbri_bytes;
     i = gst_util_uint64_scale (ts, mp3parse->vbri_seek_points - 1, total_time);
     i = CLAMP (i, 0, mp3parse->vbri_seek_points - 1);
 
@@ -1823,15 +1816,12 @@ mp3parse_bytepos_to_time (GstMPEGAudioParse * mp3parse,
 
   /* If XING seek table exists use this for byte->time conversion */
   if (!from_total_time && (mp3parse->xing_flags & XING_TOC_FLAG) &&
-      mp3parse_total_bytes (mp3parse, &total_bytes) &&
-      mp3parse_total_time (mp3parse, &total_time)) {
+      (total_bytes = mp3parse->xing_bytes) &&
+      (total_time = mp3parse->xing_total_time)) {
     gdouble fa, fb, fx;
     gdouble pos;
     gint index;
 
-    /* xing indicated size is preferred over e.g. truncated file size */
-    if (mp3parse->xing_bytes)
-      total_bytes = mp3parse->xing_bytes;
     pos = CLAMP ((bytepos * 256.0) / total_bytes, 0.0, 256.0);
     index = CLAMP (pos, 0, 255);
     fa = mp3parse->xing_seek_table_inverse[index];
@@ -1848,15 +1838,12 @@ mp3parse_bytepos_to_time (GstMPEGAudioParse * mp3parse,
   }
 
   if (!from_total_time && mp3parse->vbri_seek_table &&
-      mp3parse_total_bytes (mp3parse, &total_bytes) &&
-      mp3parse_total_time (mp3parse, &total_time)) {
+      (total_bytes = mp3parse->vbri_bytes) &&
+      (total_time = mp3parse->vbri_total_time)) {
     gint i = 0;
     guint64 sum = 0;
     gdouble a, b, fa, fb;
 
-    /* header indicated size is preferred over e.g. truncated file size */
-    if (mp3parse->vbri_bytes)
-      total_bytes = mp3parse->vbri_bytes;
     do {
       sum += mp3parse->vbri_seek_table[i];
       i++;