fftools/ffmpeg_filter: pass autorotate/reinit flags through InputFilterOptions

Rather than read them directly from InputStream.

This is a step towards avoiding the assumption that filtergraph inputs
are always fed by demuxers.

fftools/ffmpeg.h

@@ -250,6 +250,11 @@ typedef struct OptionsContext {
     SpecifierOptList mux_stats_fmt;
 } OptionsContext;
 
+enum IFilterFlags {
+    IFILTER_FLAG_AUTOROTATE     = (1 << 0),
+    IFILTER_FLAG_REINIT         = (1 << 1),
+};
+
 typedef struct InputFilterOptions {
     int64_t             trim_start_us;
     int64_t             trim_end_us;
@@ -258,6 +263,9 @@ typedef struct InputFilterOptions {
 
     int                 sub2video_width;
     int                 sub2video_height;
+
+    // a combination of IFILTER_FLAG_*
+    unsigned            flags;
 } InputFilterOptions;
 
 typedef struct InputFilter {
@@ -381,8 +389,6 @@ typedef struct InputStream {
      */
     struct OutputStream **outputs;
     int                nb_outputs;
-
-    int reinit_filters;
 } InputStream;
 
 typedef struct InputFile {

fftools/ffmpeg_demux.c

@@ -63,6 +63,7 @@ typedef struct DemuxStream {
 
     int streamcopy_needed;
     int have_sub2video;
+    int reinit_filters;
 
     int wrap_correction_done;
     int saw_first_ts;
@@ -1033,6 +1034,9 @@ int ist_filter_add(InputStream *ist, InputFilter *ifilter, int is_simple,
     if (!opts->name)
         return AVERROR(ENOMEM);
 
+    opts->flags |= IFILTER_FLAG_AUTOROTATE * !!(ist->autorotate) |
+                   IFILTER_FLAG_REINIT     * !!(ds->reinit_filters);
+
     return ds->sch_idx_dec;
 }
 
@@ -1309,8 +1313,8 @@ static int ist_add(const OptionsContext *o, Demuxer *d, AVStream *st)
     if (ret < 0)
         return ret;
 
-    ist->reinit_filters = -1;
-    MATCH_PER_STREAM_OPT(reinit_filters, i, ist->reinit_filters, ic, st);
+    ds->reinit_filters = -1;
+    MATCH_PER_STREAM_OPT(reinit_filters, i, ds->reinit_filters, ic, st);
 
     ist->user_set_discard = AVDISCARD_NONE;
 

fftools/ffmpeg_filter.c

@@ -1534,7 +1534,8 @@ static int configure_input_video_filter(FilterGraph *fg, AVFilterGraph *graph,
     av_assert0(desc);
 
     // TODO: insert hwaccel enabled filters like transpose_vaapi into the graph
-    if (ist->autorotate && !(desc->flags & AV_PIX_FMT_FLAG_HWACCEL)) {
+    if ((ifp->opts.flags & IFILTER_FLAG_AUTOROTATE) &&
+        !(desc->flags & AV_PIX_FMT_FLAG_HWACCEL)) {
         int32_t *displaymatrix = ifp->displaymatrix;
         double theta;
 
@@ -2614,7 +2615,7 @@ static int send_frame(FilterGraph *fg, FilterGraphThread *fgt,
     } else if (ifp->displaymatrix_present)
         need_reinit |= MATRIX_CHANGED;
 
-    if (!ifp->ist->reinit_filters && fgt->graph)
+    if (!(ifp->opts.flags & IFILTER_FLAG_REINIT) && fgt->graph)
         need_reinit = 0;
 
     if (!!ifp->hw_frames_ctx != !!frame->hw_frames_ctx ||