2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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.
12 // VP8 Set Active and ROI Maps
13 // ===========================
15 // This is an example demonstrating how to control the VP8 encoder's
16 // ROI and Active maps.
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.
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
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.
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.
38 // The active map is cleared on frame 44.
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.
49 #define VPX_CODEC_DISABLE_COMPAT 1
50 #include "vpx/vp8cx.h"
51 #include "vpx/vpx_encoder.h"
53 #include "./tools_common.h"
54 #include "./video_writer.h"
56 static const char *exec_name;
59 fprintf(stderr, "Usage: %s <width> <height> <infile> <outfile>\n", exec_name);
63 static void set_roi_map(const vpx_codec_enc_cfg_t *cfg,
64 vpx_codec_ctx_t *codec) {
66 vpx_roi_map_t roi = {0};
68 roi.rows = cfg->g_h / 16;
69 roi.cols = cfg->g_w / 16;
81 roi.static_threshold[0] = 1500;
82 roi.static_threshold[1] = 1000;
83 roi.static_threshold[2] = 500;
84 roi.static_threshold[3] = 0;
86 roi.roi_map = (uint8_t *)malloc(roi.rows * roi.cols);
87 for (i = 0; i < roi.rows * roi.cols; ++i)
88 roi.roi_map[i] = i % 4;
90 if (vpx_codec_control(codec, VP8E_SET_ROI_MAP, &roi))
91 die_codec(codec, "Failed to set ROI map");
96 static void set_active_map(const vpx_codec_enc_cfg_t *cfg,
97 vpx_codec_ctx_t *codec) {
99 vpx_active_map_t map = {0};
101 map.rows = cfg->g_h / 16;
102 map.cols = cfg->g_w / 16;
104 map.active_map = (uint8_t *)malloc(map.rows * map.cols);
105 for (i = 0; i < map.rows * map.cols; ++i)
106 map.active_map[i] = i % 2;
108 if (vpx_codec_control(codec, VP8E_SET_ACTIVEMAP, &map))
109 die_codec(codec, "Failed to set active map");
111 free(map.active_map);
114 static void unset_active_map(const vpx_codec_enc_cfg_t *cfg,
115 vpx_codec_ctx_t *codec) {
116 vpx_active_map_t map = {0};
118 map.rows = cfg->g_h / 16;
119 map.cols = cfg->g_w / 16;
120 map.active_map = NULL;
122 if (vpx_codec_control(codec, VP8E_SET_ACTIVEMAP, &map))
123 die_codec(codec, "Failed to set active map");
126 static void encode_frame(vpx_codec_ctx_t *codec,
129 VpxVideoWriter *writer) {
130 vpx_codec_iter_t iter = NULL;
131 const vpx_codec_cx_pkt_t *pkt = NULL;
132 const vpx_codec_err_t res = vpx_codec_encode(codec, img, frame_index, 1, 0,
133 VPX_DL_GOOD_QUALITY);
134 if (res != VPX_CODEC_OK)
135 die_codec(codec, "Failed to encode frame");
137 while ((pkt = vpx_codec_get_cx_data(codec, &iter)) != NULL) {
138 if (pkt->kind == VPX_CODEC_CX_FRAME_PKT) {
139 const int keyframe = (pkt->data.frame.flags & VPX_FRAME_IS_KEY) != 0;
140 if (!vpx_video_writer_write_frame(writer,
143 pkt->data.frame.pts)) {
144 die_codec(codec, "Failed to write compressed frame");
147 printf(keyframe ? "K" : ".");
153 int main(int argc, char **argv) {
155 vpx_codec_ctx_t codec = {0};
156 vpx_codec_enc_cfg_t cfg = {0};
158 vpx_image_t raw = {0};
160 VpxVideoInfo info = {0};
161 VpxVideoWriter *writer = NULL;
162 const VpxInterface *encoder = NULL;
163 const int fps = 2; // TODO(dkovalev) add command line argument
164 const int bitrate = 200; // kbit/s TODO(dkovalev) add command line argument
169 die("Invalid number of arguments");
171 encoder = get_vpx_encoder_by_name("vp8"); // only vp8 for now
173 die("Unsupported codec.");
175 info.codec_fourcc = encoder->fourcc;
176 info.frame_width = strtol(argv[1], NULL, 0);
177 info.frame_height = strtol(argv[2], NULL, 0);
178 info.time_base.numerator = 1;
179 info.time_base.denominator = fps;
181 if (info.frame_width <= 0 ||
182 info.frame_height <= 0 ||
183 (info.frame_width % 2) != 0 ||
184 (info.frame_height % 2) != 0) {
185 die("Invalid frame size: %dx%d", info.frame_width, info.frame_height);
188 if (!vpx_img_alloc(&raw, VPX_IMG_FMT_I420, info.frame_width,
189 info.frame_height, 1)) {
190 die("Failed to allocate image.");
193 printf("Using %s\n", vpx_codec_iface_name(encoder->interface()));
195 res = vpx_codec_enc_config_default(encoder->interface(), &cfg, 0);
197 die_codec(&codec, "Failed to get default codec config.");
199 cfg.g_w = info.frame_width;
200 cfg.g_h = info.frame_height;
201 cfg.g_timebase.num = info.time_base.numerator;
202 cfg.g_timebase.den = info.time_base.denominator;
203 cfg.rc_target_bitrate = bitrate;
205 writer = vpx_video_writer_open(argv[4], kContainerIVF, &info);
207 die("Failed to open %s for writing.", argv[4]);
209 if (!(infile = fopen(argv[3], "rb")))
210 die("Failed to open %s for reading.", argv[3]);
212 if (vpx_codec_enc_init(&codec, encoder->interface(), &cfg, 0))
213 die_codec(&codec, "Failed to initialize encoder");
215 while (vpx_img_read(&raw, infile)) {
218 if (frame_count == 22) {
219 set_roi_map(&cfg, &codec);
220 } else if (frame_count == 33) {
221 set_active_map(&cfg, &codec);
222 } else if (frame_count == 44) {
223 unset_active_map(&cfg, &codec);
226 encode_frame(&codec, &raw, frame_count, writer);
228 encode_frame(&codec, NULL, -1, writer);
231 printf("Processed %d frames.\n", frame_count);
234 if (vpx_codec_destroy(&codec))
235 die_codec(&codec, "Failed to destroy codec.");
237 vpx_video_writer_close(writer);