adaptivedemux: Enable bitrate selection for trick mode streaming again

And scale the bitrate with the absolute rate (if it's bigger than 1.0) to get
to the real bitrate due to faster playback.

This allowed in my tests to play a stream with 10x speed without buffering as
the lowest bitrate is chosen, instead of staying/selecting the highest bitrate
and then buffering all the time.

It was previously disabled for not very well specified reasons, which seem to
be not valid anymore nowadays.

3 files changed, 14 insertions, 7 deletions

diff --git a/ext/dash/gstdashdemux.c b/ext/dash/gstdashdemux.c
index 5fe629c3f..2b29a1de8 100644
--- a/ext/dash/gstdashdemux.c
+++ b/ext/dash/gstdashdemux.c
@@ -1437,6 +1437,7 @@ gst_dash_demux_stream_select_bitrate (GstAdaptiveDemuxStream * stream,
   GstActiveStream *active_stream = NULL;
   GList *rep_list = NULL;
   gint new_index;
+  GstAdaptiveDemux *base_demux = stream->demux;
   GstDashDemux *demux = GST_DASH_DEMUX_CAST (stream->demux);
   GstDashDemuxStream *dashstream = (GstDashDemuxStream *) stream;
   gboolean ret = FALSE;
@@ -1457,7 +1458,15 @@ gst_dash_demux_stream_select_bitrate (GstAdaptiveDemuxStream * stream,
       "Trying to change to bitrate: %" G_GUINT64_FORMAT, bitrate);
 
   /* get representation index with current max_bandwidth */
-  new_index = gst_mpdparser_get_rep_idx_with_max_bandwidth (rep_list, bitrate);
+  if ((base_demux->segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS) ||
+      ABS (base_demux->segment.rate) <= 1.0) {
+    new_index =
+        gst_mpdparser_get_rep_idx_with_max_bandwidth (rep_list, bitrate);
+  } else {
+    new_index =
+        gst_mpdparser_get_rep_idx_with_max_bandwidth (rep_list,
+        bitrate / ABS (base_demux->segment.rate));
+  }
 
   /* if no representation has the required bandwidth, take the lowest one */
   if (new_index == -1)
diff --git a/ext/hls/gsthlsdemux.c b/ext/hls/gsthlsdemux.c
index 4cf5b8138..a4eaacd69 100644
--- a/ext/hls/gsthlsdemux.c
+++ b/ext/hls/gsthlsdemux.c
@@ -1086,11 +1086,8 @@ gst_hls_demux_select_bitrate (GstAdaptiveDemuxStream * stream, guint64 bitrate)
     return FALSE;
   }
 
-  /* Bitrate adaptation during trick modes does not work well */
-  if (demux->segment.rate != 1.0)
-    return FALSE;
-
-  gst_hls_demux_change_playlist (hlsdemux, bitrate, &changed);
+  gst_hls_demux_change_playlist (hlsdemux, bitrate / MAX (1.0,
+          ABS (demux->segment.rate)), &changed);
   if (changed)
     gst_hls_demux_setup_streams (GST_ADAPTIVE_DEMUX_CAST (hlsdemux));
   return changed;
diff --git a/ext/smoothstreaming/gstmssdemux.c b/ext/smoothstreaming/gstmssdemux.c
index 27725ca53..9d0aece2b 100644
--- a/ext/smoothstreaming/gstmssdemux.c
+++ b/ext/smoothstreaming/gstmssdemux.c
@@ -543,7 +543,8 @@ gst_mss_demux_stream_select_bitrate (GstAdaptiveDemuxStream * stream,
   GST_DEBUG_OBJECT (stream->pad,
       "Using stream download bitrate %" G_GUINT64_FORMAT, bitrate);
 
-  if (gst_mss_stream_select_bitrate (mssstream->manifest_stream, bitrate)) {
+  if (gst_mss_stream_select_bitrate (mssstream->manifest_stream,
+          bitrate / MAX (1.0, ABS (stream->demux->segment.rate)))) {
     GstCaps *caps;
     GstCaps *msscaps;
     GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (stream->demux);