libvpx: Pull from upstream

source/libvpx/examples/vp8cx_set_ref.c

 /*
  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 47 matching lines @@
 #include "./video_writer.h"
 
 static const char *exec_name;
 
 void usage_exit() {
   fprintf(stderr, "Usage: %s <width> <height> <infile> <outfile> <frame>\n",
           exec_name);
   exit(EXIT_FAILURE);
 }
 
-static void encode_frame(vpx_codec_ctx_t *codec,
-                         vpx_image_t *img,
-                         int frame_index,
-                         VpxVideoWriter *writer) {
+static int encode_frame(vpx_codec_ctx_t *codec,
+                        vpx_image_t *img,
+                        int frame_index,
+                        VpxVideoWriter *writer) {
+  int got_pkts = 0;
   vpx_codec_iter_t iter = NULL;
   const vpx_codec_cx_pkt_t *pkt = NULL;
   const vpx_codec_err_t res = vpx_codec_encode(codec, img, frame_index, 1, 0,
                                                VPX_DL_GOOD_QUALITY);
   if (res != VPX_CODEC_OK)
     die_codec(codec, "Failed to encode frame");
 
   while ((pkt = vpx_codec_get_cx_data(codec, &iter)) != NULL) {
+    got_pkts = 1;
+
     if (pkt->kind == VPX_CODEC_CX_FRAME_PKT) {
       const int keyframe = (pkt->data.frame.flags & VPX_FRAME_IS_KEY) != 0;
       if (!vpx_video_writer_write_frame(writer,
                                         pkt->data.frame.buf,
                                         pkt->data.frame.sz,
                                         pkt->data.frame.pts)) {
         die_codec(codec, "Failed to write compressed frame");
       }
 
       printf(keyframe ? "K" : ".");
       fflush(stdout);
     }
   }
+
+  return got_pkts;
 }
 
 int main(int argc, char **argv) {
   FILE *infile = NULL;
   vpx_codec_ctx_t codec = {0};
   vpx_codec_enc_cfg_t cfg = {0};
   int frame_count = 0;
   vpx_image_t raw;
   vpx_codec_err_t res;
   VpxVideoInfo info = {0};
@@ skipping 50 matching lines @@
   writer = vpx_video_writer_open(argv[4], kContainerIVF, &info);
   if (!writer)
     die("Failed to open %s for writing.", argv[4]);
 
   if (!(infile = fopen(argv[3], "rb")))
     die("Failed to open %s for reading.", argv[3]);
 
   if (vpx_codec_enc_init(&codec, encoder->codec_interface(), &cfg, 0))
     die_codec(&codec, "Failed to initialize encoder");
 
+  // Encode frames.
   while (vpx_img_read(&raw, infile)) {
     if (frame_count + 1 == update_frame_num) {
       vpx_ref_frame_t ref;
       ref.frame_type = VP8_LAST_FRAME;
       ref.img = raw;
       if (vpx_codec_control(&codec, VP8_SET_REFERENCE, &ref))
         die_codec(&codec, "Failed to set reference frame");
     }
 
     encode_frame(&codec, &raw, frame_count++, writer);
   }
-  encode_frame(&codec, NULL, -1, writer);
+
+  // Flush encoder.
+  while (encode_frame(&codec, NULL, -1, writer)) {};
 
   printf("\n");
   fclose(infile);
   printf("Processed %d frames.\n", frame_count);
 
   vpx_img_free(&raw);
   if (vpx_codec_destroy(&codec))
     die_codec(&codec, "Failed to destroy codec.");
 
   vpx_video_writer_close(writer);
 
   return EXIT_SUCCESS;
 }