AOMedia AV1 Codec: set_maps

| AOMedia AV1 Codec

set_maps
1/*
2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved.
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11
12// AOM Set Active and ROI Maps
13// ===========================
14//
15// This is an example demonstrating how to control the AOM encoder's
16// ROI and Active maps.
17//
18// ROI (Region 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 divisible 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 divisible 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 "aom/aom_encoder.h"
51#include "aom/aomcx.h"
52#include "common/tools_common.h"
53#include "common/video_writer.h"
54
55static const char *exec_name;
56
57void usage_exit(void) {
58 fprintf(stderr, "Usage: %s <codec> <width> <height> <infile> <outfile>\n",
59 exec_name);
60 exit(EXIT_FAILURE);
61}
62
63static void set_active_map(const aom_codec_enc_cfg_t *cfg,
64 aom_codec_ctx_t *codec) {
65 unsigned int i;
66 aom_active_map_t map = { 0, 0, 0 };
67
68 map.rows = (cfg->g_h + 15) / 16;
69 map.cols = (cfg->g_w + 15) / 16;
70
71 map.active_map = (uint8_t *)malloc(map.rows * map.cols);
72 if (!map.active_map) die("Failed to allocate active map");
73 for (i = 0; i < map.rows * map.cols; ++i) map.active_map[i] = i % 2;
74
75 if (aom_codec_control(codec, AOME_SET_ACTIVEMAP, &map))
76 die_codec(codec, "Failed to set active map");
77
78 free(map.active_map);
79}
80
81static void unset_active_map(const aom_codec_enc_cfg_t *cfg,
82 aom_codec_ctx_t *codec) {
83 aom_active_map_t map = { 0, 0, 0 };
84
85 map.rows = (cfg->g_h + 15) / 16;
86 map.cols = (cfg->g_w + 15) / 16;
87 map.active_map = NULL;
88
89 if (aom_codec_control(codec, AOME_SET_ACTIVEMAP, &map))
90 die_codec(codec, "Failed to set active map");
91}
92
93static int encode_frame(aom_codec_ctx_t *codec, aom_image_t *img,
94 int frame_index, AvxVideoWriter *writer) {
95 int got_pkts = 0;
96 aom_codec_iter_t iter = NULL;
97 const aom_codec_cx_pkt_t *pkt = NULL;
98 const aom_codec_err_t res = aom_codec_encode(codec, img, frame_index, 1, 0);
99 if (res != AOM_CODEC_OK) die_codec(codec, "Failed to encode frame");
100
101 while ((pkt = aom_codec_get_cx_data(codec, &iter)) != NULL) {
102 got_pkts = 1;
103
104 if (pkt->kind == AOM_CODEC_CX_FRAME_PKT) {
105 const int keyframe = (pkt->data.frame.flags & AOM_FRAME_IS_KEY) != 0;
106 if (!aom_video_writer_write_frame(writer, pkt->data.frame.buf,
107 pkt->data.frame.sz,
108 pkt->data.frame.pts)) {
109 die_codec(codec, "Failed to write compressed frame");
110 }
111
112 printf(keyframe ? "K" : ".");
113 fflush(stdout);
114 }
115 }
116
117 return got_pkts;
118}
119
120int main(int argc, char **argv) {
121 FILE *infile = NULL;
122 aom_codec_ctx_t codec;
123 aom_codec_enc_cfg_t cfg;
124 int frame_count = 0;
125 const int limit = 10;
126 aom_image_t raw;
127 aom_codec_err_t res;
128 AvxVideoInfo info;
129 AvxVideoWriter *writer = NULL;
130 const int fps = 2; // TODO(dkovalev) add command line argument
131 const double bits_per_pixel_per_frame = 0.067;
132
133#if CONFIG_REALTIME_ONLY
134 const int usage = 1;
135 const int speed = 7;
136#else
137 const int usage = 0;
138 const int speed = 2;
139#endif
140
141 exec_name = argv[0];
142 if (argc != 6) die("Invalid number of arguments");
143
144 memset(&info, 0, sizeof(info));
145
146 aom_codec_iface_t *encoder = get_aom_encoder_by_short_name(argv[1]);
147 if (encoder == NULL) {
148 die("Unsupported codec.");
149 }
150 assert(encoder != NULL);
151 info.codec_fourcc = get_fourcc_by_aom_encoder(encoder);
152 info.frame_width = (int)strtol(argv[2], NULL, 0);
153 info.frame_height = (int)strtol(argv[3], NULL, 0);
154 info.time_base.numerator = 1;
155 info.time_base.denominator = fps;
156
157 if (info.frame_width <= 0 || info.frame_height <= 0 ||
158 (info.frame_width % 2) != 0 || (info.frame_height % 2) != 0) {
159 die("Invalid frame size: %dx%d", info.frame_width, info.frame_height);
160 }
161
162 if (!aom_img_alloc(&raw, AOM_IMG_FMT_I420, info.frame_width,
163 info.frame_height, 1)) {
164 die("Failed to allocate image.");
165 }
166
167 printf("Using %s\n", aom_codec_iface_name(encoder));
168
169 res = aom_codec_enc_config_default(encoder, &cfg, usage);
170 if (res) die_codec(&codec, "Failed to get default codec config.");
171
172 cfg.g_w = info.frame_width;
173 cfg.g_h = info.frame_height;
174 cfg.g_timebase.num = info.time_base.numerator;
175 cfg.g_timebase.den = info.time_base.denominator;
176 cfg.rc_target_bitrate =
177 (unsigned int)(bits_per_pixel_per_frame * cfg.g_w * cfg.g_h * fps / 1000);
178 cfg.g_lag_in_frames = 0;
179
180 writer = aom_video_writer_open(argv[5], kContainerIVF, &info);
181 if (!writer) die("Failed to open %s for writing.", argv[5]);
182
183 if (!(infile = fopen(argv[4], "rb")))
184 die("Failed to open %s for reading.", argv[4]);
185
186 if (aom_codec_enc_init(&codec, encoder, &cfg, 0))
187 die("Failed to initialize encoder");
188
189 if (aom_codec_control(&codec, AOME_SET_CPUUSED, speed))
190 die_codec(&codec, "Failed to set cpu-used");
191
192 // Encode frames.
193 while (aom_img_read(&raw, infile) && frame_count < limit) {
194 ++frame_count;
195
196 if (frame_count == 5) {
197 set_active_map(&cfg, &codec);
198 } else if (frame_count == 9) {
199 unset_active_map(&cfg, &codec);
200 }
201
202 encode_frame(&codec, &raw, frame_count, writer);
203 }
204
205 // Flush encoder.
206 while (encode_frame(&codec, NULL, -1, writer)) {
207 }
208
209 printf("\n");
210 fclose(infile);
211 printf("Processed %d frames.\n", frame_count);
212
213 aom_img_free(&raw);
214 if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
215
216 aom_video_writer_close(writer);
217
218 return EXIT_SUCCESS;
219}
aom_encoder.h
Describes the encoder algorithm interface to applications.
aom_img_alloc
aom_image_t * aom_img_alloc(aom_image_t *img, aom_img_fmt_t fmt, unsigned int d_w, unsigned int d_h, unsigned int align)
Open a descriptor, allocating storage for the underlying image.
AOM_IMG_FMT_I420
@ AOM_IMG_FMT_I420
Definition aom_image.h:45
aom_image_t
struct aom_image aom_image_t
Image Descriptor.
aom_img_free
void aom_img_free(aom_image_t *img)
Close an image descriptor.
aomcx.h
Provides definitions for using AOM or AV1 encoder algorithm within the aom Codec Interface.
aom_active_map_t
struct aom_active_map aom_active_map_t
aom active region map
AOME_SET_ACTIVEMAP
@ AOME_SET_ACTIVEMAP
Codec control function to pass an Active map to encoder, aom_active_map_t* parameter.
Definition aomcx.h:190
AOME_SET_CPUUSED
@ AOME_SET_CPUUSED
Codec control function to set encoder internal speed settings, int parameter.
Definition aomcx.h:220
aom_codec_iface_name
const char * aom_codec_iface_name(aom_codec_iface_t *iface)
Return the name for a given interface.
aom_codec_control
aom_codec_err_t aom_codec_control(aom_codec_ctx_t *ctx, int ctrl_id,...)
Algorithm Control.
aom_codec_ctx_t
struct aom_codec_ctx aom_codec_ctx_t
Codec context structure.
aom_codec_iface_t
const struct aom_codec_iface aom_codec_iface_t
Codec interface structure.
Definition aom_codec.h:271
aom_codec_destroy
aom_codec_err_t aom_codec_destroy(aom_codec_ctx_t *ctx)
Destroy a codec instance.
aom_codec_err_t
aom_codec_err_t
Algorithm return codes.
Definition aom_codec.h:155
aom_codec_iter_t
const void * aom_codec_iter_t
Iterator.
Definition aom_codec.h:305
AOM_FRAME_IS_KEY
#define AOM_FRAME_IS_KEY
Definition aom_codec.h:288
AOM_CODEC_OK
@ AOM_CODEC_OK
Operation completed without error.
Definition aom_codec.h:157
aom_codec_get_cx_data
const aom_codec_cx_pkt_t * aom_codec_get_cx_data(aom_codec_ctx_t *ctx, aom_codec_iter_t *iter)
Encoded data iterator.
aom_codec_cx_pkt_t
struct aom_codec_cx_pkt aom_codec_cx_pkt_t
Encoder output packet.
aom_codec_encode
aom_codec_err_t aom_codec_encode(aom_codec_ctx_t *ctx, const aom_image_t *img, aom_codec_pts_t pts, unsigned long duration, aom_enc_frame_flags_t flags)
Encode a frame.
aom_codec_enc_init
#define aom_codec_enc_init(ctx, iface, cfg, flags)
Convenience macro for aom_codec_enc_init_ver().
Definition aom_encoder.h:945
aom_codec_enc_config_default
aom_codec_err_t aom_codec_enc_config_default(aom_codec_iface_t *iface, aom_codec_enc_cfg_t *cfg, unsigned int usage)
Get the default configuration for a usage.
aom_codec_enc_cfg_t
struct aom_codec_enc_cfg aom_codec_enc_cfg_t
Encoder configuration structure.
AOM_CODEC_CX_FRAME_PKT
@ AOM_CODEC_CX_FRAME_PKT
Definition aom_encoder.h:110
aom_active_map::rows
unsigned int rows
Definition aomcx.h:1679
aom_active_map::cols
unsigned int cols
Definition aomcx.h:1680
aom_active_map::active_map
unsigned char * active_map
specify an on (1) or off (0) each 16x16 region within a frame
Definition aomcx.h:1678
aom_codec_cx_pkt::sz
size_t sz
Definition aom_encoder.h:127
aom_codec_cx_pkt::kind
enum aom_codec_cx_pkt_kind kind
Definition aom_encoder.h:123
aom_codec_cx_pkt::data
union aom_codec_cx_pkt::@202210014045072156205127107315337341215221351166 data
aom_codec_cx_pkt::pts
aom_codec_pts_t pts
time stamp to show frame (in timebase units)
Definition aom_encoder.h:129
aom_codec_cx_pkt::flags
aom_codec_frame_flags_t flags
Definition aom_encoder.h:132
aom_codec_cx_pkt::frame
struct aom_codec_cx_pkt::@202210014045072156205127107315337341215221351166::@052232317104146204273007241322037340334334344046 frame
aom_codec_cx_pkt::buf
void * buf
Definition aom_encoder.h:126
aom_codec_enc_cfg::g_timebase
struct aom_rational g_timebase
Stream timebase units.
Definition aom_encoder.h:491
aom_codec_enc_cfg::g_h
unsigned int g_h
Height of the frame.
Definition aom_encoder.h:437
aom_codec_enc_cfg::g_lag_in_frames
unsigned int g_lag_in_frames
Allow lagged encoding.
Definition aom_encoder.h:520
aom_codec_enc_cfg::g_w
unsigned int g_w
Width of the frame.
Definition aom_encoder.h:428
aom_codec_enc_cfg::rc_target_bitrate
unsigned int rc_target_bitrate
Target data rate.
Definition aom_encoder.h:646
aom_rational::num
int num
Definition aom_encoder.h:165
aom_rational::den
int den
Definition aom_encoder.h:166