shithub: libvpx

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Support code show_existing_frame in bit-stream header

Allow the bit-stream writer to support potential use of
show_existing_frame. At this point, cm->show_existing_frame is
always 0.

Change-Id: I64fed1d72db6d4902d56774854ce24fb7a082e0c

--- a/vp9/encoder/vp9_bitstream.c

+++ b/vp9/encoder/vp9_bitstream.c

@@ -1192,7 +1192,13 @@

   write_profile(cm->profile, wb);

-  vpx_wb_write_bit(wb, 0);  // show_existing_frame

+  // If to use show existing frame.

+  vpx_wb_write_bit(wb, cm->show_existing_frame);

+  if (cm->show_existing_frame) {

+    vpx_wb_write_literal(wb, cpi->alt_fb_idx, 3);

+    return;

+  }

+

   vpx_wb_write_bit(wb, cm->frame_type);

   vpx_wb_write_bit(wb, cm->show_frame);

   vpx_wb_write_bit(wb, cm->error_resilient_mode);