set_maps.c revision 233d2500723e5594f3e7c70896ffeeef32b9c950 
1/*
2 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11
12// VP8 Set Active and ROI Maps
13// ===========================
14//
15// This is an example demonstrating how to control the VP8 encoder's
16// ROI and Active maps.
17//
18// ROI (Reigon of Interest) maps are a way for the application to assign
19// each macroblock in the image to a region, and then set quantizer and
20// filtering parameters on that image.
21//
22// Active maps are a way for the application to specify on a
23// macroblock-by-macroblock basis whether there is any activity in that
24// macroblock.
25//
26//
27// Configuration
28// -------------
29// An ROI map is set on frame 22. If the width of the image in macroblocks
30// is evenly divisble by 4, then the output will appear to have distinct
31// columns, where the quantizer, loopfilter, and static threshold differ
32// from column to column.
33//
34// An active map is set on frame 33. If the width of the image in macroblocks
35// is evenly divisble by 4, then the output will appear to have distinct
36// columns, where one column will have motion and the next will not.
37//
38// The active map is cleared on frame 44.
39//
40// Observing The Effects
41// ---------------------
42// Use the `simple_decoder` example to decode this sample, and observe
43// the change in the image at frames 22, 33, and 44.
44
45#include <stdio.h>
46#include <stdlib.h>
47#include <string.h>
48
49#define VPX_CODEC_DISABLE_COMPAT 1
50#include "vpx/vp8cx.h"
51#include "vpx/vpx_encoder.h"
52
53#include "./tools_common.h"
54#include "./video_writer.h"
55
56static const char *exec_name;
57
58void usage_exit() {
59  fprintf(stderr, "Usage: %s <codec> <width> <height> <infile> <outfile>\n",
60          exec_name);
61  exit(EXIT_FAILURE);
62}
63
64static void set_roi_map(const vpx_codec_enc_cfg_t *cfg,
65                        vpx_codec_ctx_t *codec) {
66  unsigned int i;
67  vpx_roi_map_t roi = {0};
68
69  roi.rows = (cfg->g_h + 15) / 16;
70  roi.cols = (cfg->g_w + 15) / 16;
71
72  roi.delta_q[0] = 0;
73  roi.delta_q[1] = -2;
74  roi.delta_q[2] = -4;
75  roi.delta_q[3] = -6;
76
77  roi.delta_lf[0] = 0;
78  roi.delta_lf[1] = 1;
79  roi.delta_lf[2] = 2;
80  roi.delta_lf[3] = 3;
81
82  roi.static_threshold[0] = 1500;
83  roi.static_threshold[1] = 1000;
84  roi.static_threshold[2] = 500;
85  roi.static_threshold[3] = 0;
86
87  roi.roi_map = (uint8_t *)malloc(roi.rows * roi.cols);
88  for (i = 0; i < roi.rows * roi.cols; ++i)
89    roi.roi_map[i] = i % 4;
90
91  if (vpx_codec_control(codec, VP8E_SET_ROI_MAP, &roi))
92    die_codec(codec, "Failed to set ROI map");
93
94  free(roi.roi_map);
95}
96
97static void set_active_map(const vpx_codec_enc_cfg_t *cfg,
98                           vpx_codec_ctx_t *codec) {
99  unsigned int i;
100  vpx_active_map_t map = {0};
101
102  map.rows = (cfg->g_h + 15) / 16;
103  map.cols = (cfg->g_w + 15) / 16;
104
105  map.active_map = (uint8_t *)malloc(map.rows * map.cols);
106  for (i = 0; i < map.rows * map.cols; ++i)
107    map.active_map[i] = i % 2;
108
109  if (vpx_codec_control(codec, VP8E_SET_ACTIVEMAP, &map))
110    die_codec(codec, "Failed to set active map");
111
112  free(map.active_map);
113}
114
115static void unset_active_map(const vpx_codec_enc_cfg_t *cfg,
116                             vpx_codec_ctx_t *codec) {
117  vpx_active_map_t map = {0};
118
119  map.rows = (cfg->g_h + 15) / 16;
120  map.cols = (cfg->g_w + 15) / 16;
121  map.active_map = NULL;
122
123  if (vpx_codec_control(codec, VP8E_SET_ACTIVEMAP, &map))
124    die_codec(codec, "Failed to set active map");
125}
126
127static void encode_frame(vpx_codec_ctx_t *codec,
128                         vpx_image_t *img,
129                         int frame_index,
130                         VpxVideoWriter *writer) {
131  vpx_codec_iter_t iter = NULL;
132  const vpx_codec_cx_pkt_t *pkt = NULL;
133  const vpx_codec_err_t res = vpx_codec_encode(codec, img, frame_index, 1, 0,
134                                               VPX_DL_GOOD_QUALITY);
135  if (res != VPX_CODEC_OK)
136    die_codec(codec, "Failed to encode frame");
137
138  while ((pkt = vpx_codec_get_cx_data(codec, &iter)) != NULL) {
139    if (pkt->kind == VPX_CODEC_CX_FRAME_PKT) {
140      const int keyframe = (pkt->data.frame.flags & VPX_FRAME_IS_KEY) != 0;
141      if (!vpx_video_writer_write_frame(writer,
142                                        pkt->data.frame.buf,
143                                        pkt->data.frame.sz,
144                                        pkt->data.frame.pts)) {
145        die_codec(codec, "Failed to write compressed frame");
146      }
147
148      printf(keyframe ? "K" : ".");
149      fflush(stdout);
150    }
151  }
152}
153
154int main(int argc, char **argv) {
155  FILE *infile = NULL;
156  vpx_codec_ctx_t codec = {0};
157  vpx_codec_enc_cfg_t cfg = {0};
158  int frame_count = 0;
159  vpx_image_t raw = {0};
160  vpx_codec_err_t res;
161  VpxVideoInfo info = {0};
162  VpxVideoWriter *writer = NULL;
163  const VpxInterface *encoder = NULL;
164  const int fps = 2;        // TODO(dkovalev) add command line argument
165  const double bits_per_pixel_per_frame = 0.067;
166
167  exec_name = argv[0];
168
169  if (argc != 6)
170    die("Invalid number of arguments");
171
172  encoder = get_vpx_encoder_by_name(argv[1]);
173  if (!encoder)
174    die("Unsupported codec.");
175
176  info.codec_fourcc = encoder->fourcc;
177  info.frame_width = strtol(argv[2], NULL, 0);
178  info.frame_height = strtol(argv[3], NULL, 0);
179  info.time_base.numerator = 1;
180  info.time_base.denominator = fps;
181
182  if (info.frame_width <= 0 ||
183      info.frame_height <= 0 ||
184      (info.frame_width % 2) != 0 ||
185      (info.frame_height % 2) != 0) {
186    die("Invalid frame size: %dx%d", info.frame_width, info.frame_height);
187  }
188
189  if (!vpx_img_alloc(&raw, VPX_IMG_FMT_I420, info.frame_width,
190                                             info.frame_height, 1)) {
191    die("Failed to allocate image.");
192  }
193
194  printf("Using %s\n", vpx_codec_iface_name(encoder->interface()));
195
196  res = vpx_codec_enc_config_default(encoder->interface(), &cfg, 0);
197  if (res)
198    die_codec(&codec, "Failed to get default codec config.");
199
200  cfg.g_w = info.frame_width;
201  cfg.g_h = info.frame_height;
202  cfg.g_timebase.num = info.time_base.numerator;
203  cfg.g_timebase.den = info.time_base.denominator;
204  cfg.rc_target_bitrate = (unsigned int)(bits_per_pixel_per_frame * cfg.g_w *
205                                         cfg.g_h * fps / 1000);
206  cfg.g_lag_in_frames = 0;
207
208  writer = vpx_video_writer_open(argv[5], kContainerIVF, &info);
209  if (!writer)
210    die("Failed to open %s for writing.", argv[5]);
211
212  if (!(infile = fopen(argv[4], "rb")))
213    die("Failed to open %s for reading.", argv[4]);
214
215  if (vpx_codec_enc_init(&codec, encoder->interface(), &cfg, 0))
216    die_codec(&codec, "Failed to initialize encoder");
217
218  while (vpx_img_read(&raw, infile)) {
219    ++frame_count;
220
221    if (frame_count == 22 && encoder->fourcc == VP8_FOURCC) {
222      set_roi_map(&cfg, &codec);
223    } else if (frame_count == 33) {
224      set_active_map(&cfg, &codec);
225    } else if (frame_count == 44) {
226      unset_active_map(&cfg, &codec);
227    }
228
229    encode_frame(&codec, &raw, frame_count, writer);
230  }
231  encode_frame(&codec, NULL, -1, writer);
232  printf("\n");
233  fclose(infile);
234  printf("Processed %d frames.\n", frame_count);
235
236  vpx_img_free(&raw);
237  if (vpx_codec_destroy(&codec))
238    die_codec(&codec, "Failed to destroy codec.");
239
240  vpx_video_writer_close(writer);
241
242  return EXIT_SUCCESS;
243}
244