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 56 static const char *exec_name; 57 58 void usage_exit() { 59 fprintf(stderr, "Usage: %s <codec> <width> <height> <infile> <outfile>\n", 60 exec_name); 61 exit(EXIT_FAILURE); 62 } 63 64 static 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 97 static 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 } 114 115 static 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 } 126 127 static 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 } 153 154 int 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
