set_maps.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.
 */


// VP8 Set Active and ROI Maps
// ===========================
//
// This is an example demonstrating how to control the VP8 encoder's
// ROI and Active maps.
//
// ROI (Reigon of Interest) maps are a way for the application to assign
// each macroblock in the image to a region, and then set quantizer and
// filtering parameters on that image.
//
// Active maps are a way for the application to specify on a
// macroblock-by-macroblock basis whether there is any activity in that
// macroblock.
//
//
// Configuration
// -------------
// An ROI map is set on frame 22. If the width of the image in macroblocks
// is evenly divisble by 4, then the output will appear to have distinct
// columns, where the quantizer, loopfilter, and static threshold differ
// from column to column.
//
// An active map is set on frame 33. If the width of the image in macroblocks
// is evenly divisble by 4, then the output will appear to have distinct
// columns, where one column will have motion and the next will not.
//
// The active map is cleared on frame 44.
//
// Observing The Effects
// ---------------------
// Use the `simple_decoder` example to decode this sample, and observe
// the change in the image at frames 22, 33, and 44.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define VPX_CODEC_DISABLE_COMPAT 1
#include "vpx/vp8cx.h"
#include "vpx/vpx_encoder.h"

#include "./tools_common.h"
#include "./video_writer.h"

static const char *exec_name;

void usage_exit() {
  fprintf(stderr, "Usage: %s <codec> <width> <height> <infile> <outfile>\n",
          exec_name);
  exit(EXIT_FAILURE);
}

static void set_roi_map(const vpx_codec_enc_cfg_t *cfg,
                        vpx_codec_ctx_t *codec) {
  unsigned int i;
  vpx_roi_map_t roi = {0};

  roi.rows = (cfg->g_h + 15) / 16;
  roi.cols = (cfg->g_w + 15) / 16;