filter_units, trace_headers: Always use fragment from context

This is in preparation for another patch that will stop needless
reallocations of the unit array.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@googlemail.com>

libavcodec/filter_units_bsf.c

@@ -199,18 +199,18 @@ static int filter_units_init(AVBSFContext *bsf)
     ctx->cbc->nb_decompose_unit_types = 0;
 
     if (bsf->par_in->extradata) {
-        CodedBitstreamFragment ps;
+        CodedBitstreamFragment *frag = &ctx->fragment;
 
-        err = ff_cbs_read_extradata(ctx->cbc, &ps, bsf->par_in);
+        err = ff_cbs_read_extradata(ctx->cbc, frag, bsf->par_in);
         if (err < 0) {
             av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
         } else {
-            err = ff_cbs_write_extradata(ctx->cbc, bsf->par_out, &ps);
+            err = ff_cbs_write_extradata(ctx->cbc, bsf->par_out, frag);
             if (err < 0)
                 av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
         }
 
-        ff_cbs_fragment_uninit(ctx->cbc, &ps);
+        ff_cbs_fragment_uninit(ctx->cbc, frag);
     }
 
     return err;

libavcodec/trace_headers_bsf.c

@@ -28,6 +28,7 @@
 
 typedef struct TraceHeadersContext {
     CodedBitstreamContext *cbc;
+    CodedBitstreamFragment fragment;
 } TraceHeadersContext;
 
 
@@ -44,13 +45,13 @@ static int trace_headers_init(AVBSFContext *bsf)
     ctx->cbc->trace_level  = AV_LOG_INFO;
 
     if (bsf->par_in->extradata) {
-        CodedBitstreamFragment ps;
+        CodedBitstreamFragment *frag = &ctx->fragment;
 
         av_log(bsf, AV_LOG_INFO, "Extradata\n");
 
-        err = ff_cbs_read_extradata(ctx->cbc, &ps, bsf->par_in);
+        err = ff_cbs_read_extradata(ctx->cbc, frag, bsf->par_in);
 
-        ff_cbs_fragment_uninit(ctx->cbc, &ps);
+        ff_cbs_fragment_uninit(ctx->cbc, frag);
     }
 
     return err;
@@ -66,7 +67,7 @@ static void trace_headers_close(AVBSFContext *bsf)
 static int trace_headers(AVBSFContext *bsf, AVPacket *pkt)
 {
     TraceHeadersContext *ctx = bsf->priv_data;
-    CodedBitstreamFragment au;
+    CodedBitstreamFragment *frag = &ctx->fragment;
     char tmp[256] = { 0 };
     int err;
 
@@ -92,9 +93,9 @@ static int trace_headers(AVBSFContext *bsf, AVPacket *pkt)
 
     av_log(bsf, AV_LOG_INFO, "Packet: %d bytes%s.\n", pkt->size, tmp);
 
-    err = ff_cbs_read_packet(ctx->cbc, &au, pkt);
+    err = ff_cbs_read_packet(ctx->cbc, frag, pkt);
 
-    ff_cbs_fragment_uninit(ctx->cbc, &au);
+    ff_cbs_fragment_uninit(ctx->cbc, frag);
 
     if (err < 0)
         av_packet_unref(pkt);