libvpx: Pull from upstream

source/libvpx/vp8/vp8_cx_iface.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 429 matching lines @@
         printf("encode_breakout: %d\n", oxcf->encode_breakout);
     */
     return VPX_CODEC_OK;
 }
 
 static vpx_codec_err_t vp8e_set_config(vpx_codec_alg_priv_t       *ctx,
                                        const vpx_codec_enc_cfg_t  *cfg)
 {
     vpx_codec_err_t res;
 
-    if (((cfg->g_w != ctx->cfg.g_w) || (cfg->g_h != ctx->cfg.g_h))
-        && (cfg->g_lag_in_frames > 1 || cfg->g_pass != VPX_RC_ONE_PASS))
-        ERROR("Cannot change width or height after initialization");
+    if (cfg->g_w != ctx->cfg.g_w || cfg->g_h != ctx->cfg.g_h)
+    {
+        if (cfg->g_lag_in_frames > 1 || cfg->g_pass != VPX_RC_ONE_PASS)
+            ERROR("Cannot change width or height after initialization");
+        if ((ctx->cpi->initial_width && (int)cfg->g_w > ctx->cpi->initial_width) ||
+            (ctx->cpi->initial_height && (int)cfg->g_h > ctx->cpi->initial_height))
+            ERROR("Cannot increast width or height larger than their initial values");
+    }
 
     /* Prevent increasing lag_in_frames. This check is stricter than it needs
      * to be -- the limit is not increasing past the first lag_in_frames
      * value, but we don't track the initial config, only the last successful
      * config.
      */
     if ((cfg->g_lag_in_frames > ctx->cfg.g_lag_in_frames))
         ERROR("Cannot increase lag_in_frames");
 
     res = validate_config(ctx, cfg, &ctx->vp8_cfg, 0);
@@ skipping 923 matching lines @@
         1,                  /* 1 cfg map */
         vp8e_usage_cfg_map, /* vpx_codec_enc_cfg_map_t    peek_si; */
         vp8e_encode,        /* vpx_codec_encode_fn_t      encode; */
         vp8e_get_cxdata,    /* vpx_codec_get_cx_data_fn_t   frame_get; */
         vp8e_set_config,
         NULL,
         vp8e_get_preview,
         vp8e_mr_alloc_mem,
     } /* encoder functions */
 };