fftools/ffmpeg: move OutputStream.last_filter_pts to OutputFilter

This value is associated with the filtergraph output rather than the
output stream, so this is a more appropriate place for it.

fftools/ffmpeg.c

@@ -697,7 +697,7 @@ static int reap_filters(int flush)
 
             if (filtered_frame->pts != AV_NOPTS_VALUE) {
                 AVRational tb = av_buffersink_get_time_base(filter);
-                ost->last_filter_pts = av_rescale_q(filtered_frame->pts, tb,
+                ost->filter->last_pts = av_rescale_q(filtered_frame->pts, tb,
                                                      AV_TIME_BASE_Q);
                 filtered_frame->time_base = tb;
 
@@ -2391,8 +2391,8 @@ static OutputStream *choose_output(void)
     for (OutputStream *ost = ost_iter(NULL); ost; ost = ost_iter(ost)) {
         int64_t opts;
 
-        if (ost->filter && ost->last_filter_pts != AV_NOPTS_VALUE) {
+        if (ost->filter && ost->filter->last_pts != AV_NOPTS_VALUE) {
-            opts = ost->last_filter_pts;
+            opts = ost->filter->last_pts;
         } else {
             opts = ost->last_mux_dts == AV_NOPTS_VALUE ?
                    INT64_MIN : ost->last_mux_dts;

fftools/ffmpeg.h

@@ -314,6 +314,9 @@ typedef struct OutputFilter {
     const int *formats;
     const AVChannelLayout *ch_layouts;
     const int *sample_rates;
+
+    /* pts of the last frame received from this filter, in AV_TIME_BASE_Q */
+    int64_t last_pts;
 } OutputFilter;
 
 typedef struct FilterGraph {
@@ -573,8 +576,6 @@ typedef struct OutputStream {
     AVStream *st;            /* stream in the output file */
     /* dts of the last packet sent to the muxing queue, in AV_TIME_BASE_Q */
     int64_t last_mux_dts;
-    /* pts of the last frame received from the filters, in AV_TIME_BASE_Q */
-    int64_t last_filter_pts;
 
     // timestamp from which the streamcopied streams should start,
     // in AV_TIME_BASE_Q;

fftools/ffmpeg_filter.c

@@ -176,6 +176,18 @@ static void choose_channel_layouts(OutputFilter *ofilter, AVBPrint *bprint)
     av_bprint_chars(bprint, ':', 1);
 }
 
+static OutputFilter *ofilter_alloc(FilterGraph *fg)
+{
+    OutputFilter *ofilter;
+
+    ofilter           = ALLOC_ARRAY_ELEM(fg->outputs, fg->nb_outputs);
+    ofilter->graph    = fg;
+    ofilter->format   = -1;
+    ofilter->last_pts = AV_NOPTS_VALUE;
+
+    return ofilter;
+}
+
 int init_simple_filtergraph(InputStream *ist, OutputStream *ost)
 {
     FilterGraph *fg = av_mallocz(sizeof(*fg));
@@ -186,10 +198,8 @@ int init_simple_filtergraph(InputStream *ist, OutputStream *ost)
         report_and_exit(AVERROR(ENOMEM));
     fg->index = nb_filtergraphs;
 
-    ofilter = ALLOC_ARRAY_ELEM(fg->outputs, fg->nb_outputs);
+    ofilter      = ofilter_alloc(fg);
     ofilter->ost = ost;
-    ofilter->graph  = fg;
-    ofilter->format = -1;
 
     ost->filter = ofilter;
 
@@ -502,9 +512,8 @@ int init_complex_filtergraph(FilterGraph *fg)
         init_input_filter(fg, cur);
 
     for (cur = outputs; cur;) {
-        OutputFilter *const ofilter = ALLOC_ARRAY_ELEM(fg->outputs, fg->nb_outputs);
+        OutputFilter *const ofilter = ofilter_alloc(fg);
 
-        ofilter->graph   = fg;
         ofilter->out_tmp = cur;
         ofilter->type    = avfilter_pad_get_type(cur->filter_ctx->output_pads,
                                                                          cur->pad_idx);

fftools/ffmpeg_mux_init.c

@@ -649,7 +649,6 @@ static OutputStream *new_output_stream(Muxer *mux, const OptionsContext *o,
         ost->ist->st->discard = ost->ist->user_set_discard;
     }
     ost->last_mux_dts = AV_NOPTS_VALUE;
-    ost->last_filter_pts = AV_NOPTS_VALUE;
 
     MATCH_PER_STREAM_OPT(copy_initial_nonkeyframes, i,
                          ost->copy_initial_nonkeyframes, oc, st);