WebM Codec SDK

- Main Page
- Related Pages
- Modules
- Data Structures
- Files

set_maps
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 <assert.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49
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;
68 memset(&roi, 0, sizeof(roi));
69
70 roi.rows = (cfg->g_h + 15) / 16;
71 roi.cols = (cfg->g_w + 15) / 16;
72
73 roi.delta_q[0] = 0;
74 roi.delta_q[1] = -2;
75 roi.delta_q[2] = -4;
76 roi.delta_q[3] = -6;
77
78 roi.delta_lf[0] = 0;
79 roi.delta_lf[1] = 1;
80 roi.delta_lf[2] = 2;
81 roi.delta_lf[3] = 3;
82
83 roi.static_threshold[0] = 1500;
84 roi.static_threshold[1] = 1000;
85 roi.static_threshold[2] = 500;
86 roi.static_threshold[3] = 0;
87
88 roi.roi_map = (uint8_t *)malloc(roi.rows * roi.cols);
89 for (i = 0; i < roi.rows * roi.cols; ++i)
90 roi.roi_map[i] = i % 4;
91
92 if (vpx_codec_control(codec, VP8E_SET_ROI_MAP, &roi))
93 die_codec(codec, "Failed to set ROI map");
94
95 free(roi.roi_map);
96 }
97
98 static void set_active_map(const vpx_codec_enc_cfg_t *cfg,
99 vpx_codec_ctx_t *codec) {
100 unsigned int i;
101 vpx_active_map_t map = {0, 0, 0};
102
103 map.rows = (cfg->g_h + 15) / 16;
104 map.cols = (cfg->g_w + 15) / 16;
105
106 map.active_map = (uint8_t *)malloc(map.rows * map.cols);
107 for (i = 0; i < map.rows * map.cols; ++i)
108 map.active_map[i] = i % 2;
109
110 if (vpx_codec_control(codec, VP8E_SET_ACTIVEMAP, &map))
111 die_codec(codec, "Failed to set active map");
112
113 free(map.active_map);
114 }
115
116 static void unset_active_map(const vpx_codec_enc_cfg_t *cfg,
117 vpx_codec_ctx_t *codec) {
118 vpx_active_map_t map = {0, 0, 0};
119
120 map.rows = (cfg->g_h + 15) / 16;
121 map.cols = (cfg->g_w + 15) / 16;
122 map.active_map = NULL;
123
124 if (vpx_codec_control(codec, VP8E_SET_ACTIVEMAP, &map))
125 die_codec(codec, "Failed to set active map");
126 }
127
128 static int encode_frame(vpx_codec_ctx_t *codec,
129 vpx_image_t *img,
130 int frame_index,
131 VpxVideoWriter *writer) {
132 int got_pkts = 0;
133 vpx_codec_iter_t iter = NULL;
134 const vpx_codec_cx_pkt_t *pkt = NULL;
135 const vpx_codec_err_t res = vpx_codec_encode(codec, img, frame_index, 1, 0,
136 VPX_DL_GOOD_QUALITY);
137 if (res != VPX_CODEC_OK)
138 die_codec(codec, "Failed to encode frame");
139
140 while ((pkt = vpx_codec_get_cx_data(codec, &iter)) != NULL) {
141 got_pkts = 1;
142
143 if (pkt->kind == VPX_CODEC_CX_FRAME_PKT) {
144 const int keyframe = (pkt->data.frame.flags & VPX_FRAME_IS_KEY) != 0;
145 if (!vpx_video_writer_write_frame(writer,
146 pkt->data.frame.buf,
147 pkt->data.frame.sz,
148 pkt->data.frame.pts)) {
149 die_codec(codec, "Failed to write compressed frame");
150 }
151
152 printf(keyframe ? "K" : ".");
153 fflush(stdout);
154 }
155 }
156
157 return got_pkts;
158 }
159
160 int main(int argc, char **argv) {
161 FILE *infile = NULL;
162 vpx_codec_ctx_t codec;
163 vpx_codec_enc_cfg_t cfg;
164 int frame_count = 0;
165 vpx_image_t raw;
166 vpx_codec_err_t res;
167 VpxVideoInfo info;
168 VpxVideoWriter *writer = NULL;
169 const VpxInterface *encoder = NULL;
170 const int fps = 2; // TODO(dkovalev) add command line argument
171 const double bits_per_pixel_per_frame = 0.067;
172
173 exec_name = argv[0];
174 if (argc != 6)
175 die("Invalid number of arguments");
176
177 memset(&info, 0, sizeof(info));
178
179 encoder = get_vpx_encoder_by_name(argv[1]);
180 if (encoder == NULL) {
181 die("Unsupported codec.");
182 }
183 assert(encoder != NULL);
184 info.codec_fourcc = encoder->fourcc;
185 info.frame_width = strtol(argv[2], NULL, 0);
186 info.frame_height = strtol(argv[3], NULL, 0);
187 info.time_base.numerator = 1;
188 info.time_base.denominator = fps;
189
190 if (info.frame_width <= 0 ||
191 info.frame_height <= 0 ||
192 (info.frame_width % 2) != 0 ||
193 (info.frame_height % 2) != 0) {
194 die("Invalid frame size: %dx%d", info.frame_width, info.frame_height);
195 }
196
197 if (!vpx_img_alloc(&raw, VPX_IMG_FMT_I420, info.frame_width,
198 info.frame_height, 1)) {
199 die("Failed to allocate image.");
200 }
201
202 printf("Using %s\n", vpx_codec_iface_name(encoder->codec_interface()));
203
204 res = vpx_codec_enc_config_default(encoder->codec_interface(), &cfg, 0);
205 if (res)
206 die_codec(&codec, "Failed to get default codec config.");
207
208 cfg.g_w = info.frame_width;
209 cfg.g_h = info.frame_height;
210 cfg.g_timebase.num = info.time_base.numerator;
211 cfg.g_timebase.den = info.time_base.denominator;
212 cfg.rc_target_bitrate = (unsigned int)(bits_per_pixel_per_frame * cfg.g_w *
213 cfg.g_h * fps / 1000);
214 cfg.g_lag_in_frames = 0;
215
216 writer = vpx_video_writer_open(argv[5], kContainerIVF, &info);
217 if (!writer)
218 die("Failed to open %s for writing.", argv[5]);
219
220 if (!(infile = fopen(argv[4], "rb")))
221 die("Failed to open %s for reading.", argv[4]);
222
223 if (vpx_codec_enc_init(&codec, encoder->codec_interface(), &cfg, 0))
224 die_codec(&codec, "Failed to initialize encoder");
225
226 // Encode frames.
227 while (vpx_img_read(&raw, infile)) {
228 ++frame_count;
229
230 if (frame_count == 22 && encoder->fourcc == VP8_FOURCC) {
231 set_roi_map(&cfg, &codec);
232 } else if (frame_count == 33) {
233 set_active_map(&cfg, &codec);
234 } else if (frame_count == 44) {
235 unset_active_map(&cfg, &codec);
236 }
237
238 encode_frame(&codec, &raw, frame_count, writer);
239 }
240
241 // Flush encoder.
242 while (encode_frame(&codec, NULL, -1, writer)) {}
243
244 printf("\n");
245 fclose(infile);
246 printf("Processed %d frames.\n", frame_count);
247
248 vpx_img_free(&raw);
249 if (vpx_codec_destroy(&codec))
250 die_codec(&codec, "Failed to destroy codec.");
251
252 vpx_video_writer_close(writer);
253
254 return EXIT_SUCCESS;
255 }
vpx_roi_map::roi_map
unsigned char * roi_map
Definition: vp8cx.h:533
vpx_image
Image Descriptor.
Definition: vpx_image.h:82
vpx_encoder.h
Describes the encoder algorithm interface to applications.
vpx_codec_iface_name
const char * vpx_codec_iface_name(vpx_codec_iface_t *iface)
Return the name for a given interface.
vpx_active_map::cols
unsigned int cols
Definition: vp8cx.h:555
vpx_codec_enc_cfg::g_timebase
struct vpx_rational g_timebase
Stream timebase units.
Definition: vpx_encoder.h:394
vpx_roi_map::cols
unsigned int cols
Definition: vp8cx.h:535
vpx_rational::den
int den
Definition: vpx_encoder.h:258
vpx_codec_encode
vpx_codec_err_t vpx_codec_encode(vpx_codec_ctx_t *ctx, const vpx_image_t *img, vpx_codec_pts_t pts, unsigned long duration, vpx_enc_frame_flags_t flags, unsigned long deadline)
Encode a frame.
VP8E_SET_ROI_MAP
Codec control function to pass an ROI map to encoder.
Definition: vp8cx.h:158
vpx_codec_enc_cfg::g_lag_in_frames
unsigned int g_lag_in_frames
Allow lagged encoding.
Definition: vpx_encoder.h:426
vpx_codec_enc_cfg
Encoder configuration structure.
Definition: vpx_encoder.h:311
vpx_codec_cx_pkt
Encoder output packet.
Definition: vpx_encoder.h:192
vpx_codec_cx_pkt::frame
struct vpx_codec_cx_pkt::@1::@2 frame
vpx_img_alloc
vpx_image_t * vpx_img_alloc(vpx_image_t *img, vpx_img_fmt_t fmt, unsigned int d_w, unsigned int d_h, unsigned int align)
Open a descriptor, allocating storage for the underlying image.
VPX_IMG_FMT_I420
Definition: vpx_image.h:56
vpx_codec_enc_cfg::g_w
unsigned int g_w
Width of the frame.
Definition: vpx_encoder.h:354
vpx_roi_map::static_threshold
unsigned int static_threshold[4]
Definition: vp8cx.h:542
vpx_codec_enc_cfg::g_h
unsigned int g_h
Height of the frame.
Definition: vpx_encoder.h:364
vpx_codec_cx_pkt::kind
enum vpx_codec_cx_pkt_kind kind
Definition: vpx_encoder.h:193
VPX_CODEC_OK
Operation completed without error.
Definition: vpx_codec.h:91
vpx_img_free
void vpx_img_free(vpx_image_t *img)
Close an image descriptor.
vpx_codec_enc_cfg::rc_target_bitrate
unsigned int rc_target_bitrate
Target data rate.
Definition: vpx_encoder.h:522
vpx_rational::num
int num
Definition: vpx_encoder.h:257
vpx_roi_map::delta_lf
int delta_lf[4]
Definition: vp8cx.h:540
VPX_DL_GOOD_QUALITY
#define VPX_DL_GOOD_QUALITY
Definition: vpx_encoder.h:894
vp8cx.h
Provides definitions for using VP8 or VP9 encoder algorithm within the vpx Codec Interface.
vpx_active_map::active_map
unsigned char * active_map
Definition: vp8cx.h:553
vpx_codec_enc_init
#define vpx_codec_enc_init(ctx, iface, cfg, flags)
Convenience macro for vpx_codec_enc_init_ver()
Definition: vpx_encoder.h:793
vpx_codec_err_t
vpx_codec_err_t
Algorithm return codes.
Definition: vpx_codec.h:89
vpx_codec_get_cx_data
const vpx_codec_cx_pkt_t * vpx_codec_get_cx_data(vpx_codec_ctx_t *ctx, vpx_codec_iter_t *iter)
Encoded data iterator.
vpx_active_map::rows
unsigned int rows
Definition: vp8cx.h:554
vpx_codec_cx_pkt::data
union vpx_codec_cx_pkt::@1 data
vpx_codec_enc_config_default
vpx_codec_err_t vpx_codec_enc_config_default(vpx_codec_iface_t *iface, vpx_codec_enc_cfg_t *cfg, unsigned int reserved)
Get a default configuration.
vpx_active_map
vpx active region map
Definition: vp8cx.h:552
vpx_codec_control
#define vpx_codec_control(ctx, id, data)
vpx_codec_control wrapper macro
Definition: vpx_codec.h:407
vpx_codec_destroy
vpx_codec_err_t vpx_codec_destroy(vpx_codec_ctx_t *ctx)
Destroy a codec instance.
vpx_roi_map::rows
unsigned int rows
Definition: vp8cx.h:534
VPX_FRAME_IS_KEY
#define VPX_FRAME_IS_KEY
Definition: vpx_encoder.h:127
vpx_codec_iter_t
const void * vpx_codec_iter_t
Iterator.
Definition: vpx_codec.h:188
vpx_roi_map
vpx region of interest map
Definition: vp8cx.h:531
VPX_CODEC_CX_FRAME_PKT
Definition: vpx_encoder.h:173
vpx_roi_map::delta_q
int delta_q[4]
Definition: vp8cx.h:539
VP8E_SET_ACTIVEMAP
Codec control function to pass an Active map to encoder.
Definition: vp8cx.h:164
vpx_codec_ctx
Codec context structure.
Definition: vpx_codec.h:199