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aom/vp9_spatial_scalable_encoder.c

488 строки
15 KiB
C
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/*
* Copyright (c) 2012 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/*
* This is an example demonstrating how to implement a multi-layer
* VP9 encoding scheme based on spatial scalability for video applications
* that benefit from a scalable bitstream.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <time.h>
#include <string.h>
#include <unistd.h>
#include <libgen.h>
#define VPX_CODEC_DISABLE_COMPAT 1
#include "vpx/vpx_encoder.h"
#include "vpx/vp8cx.h"
#define interface (vpx_codec_vp9_cx())
#define fourcc 0x30395056
#define IVF_FILE_HDR_SZ (32)
#define IVF_FRAME_HDR_SZ (12)
#define NUM_BUFFERS 8
char *input_filename;
char *output_filename;
unsigned int number_frames_to_code = 60 * 60;
unsigned int number_frames_to_skip = 0;
unsigned int number_spatial_layers = 5;
unsigned int key_period = 100;
typedef enum ENCODING_MODE {
INTER_LAYER_PREDICTION_I,
INTER_LAYER_PREDICTION_IP,
USE_GOLDEN_FRAME
} ENCODING_MODE;
static void mem_put_le16(char *mem, unsigned int val) {
mem[0] = val;
mem[1] = val >> 8;
}
static void mem_put_le32(char *mem, unsigned int val) {
mem[0] = val;
mem[1] = val >> 8;
mem[2] = val >> 16;
mem[3] = val >> 24;
}
static void usage(char *program_name) {
printf(
"Usage: %s [-f frames] [-s skip_frames] [-w width] [-h height] \n\t"
"[-n rate_num] [-d rate_den] [-b bitrate] [-l layers] "
"<input_filename> <output_filename>\n",
basename(program_name));
exit(EXIT_FAILURE);
}
static void die(const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
vprintf(fmt, ap);
if (fmt[strlen(fmt) - 1] != '\n') printf("\n");
exit(EXIT_FAILURE);
}
static void die_codec(vpx_codec_ctx_t *ctx, const char *s) {
const char *detail = vpx_codec_error_detail(ctx);
printf("%s: %s\n", s, vpx_codec_error(ctx));
if (detail) printf(" %s\n", detail);
exit(EXIT_FAILURE);
}
static int read_frame(FILE *f, vpx_image_t *img) {
size_t nbytes, to_read;
int res = 1;
to_read = img->w * img->h * 3 / 2;
nbytes = fread(img->planes[0], 1, to_read, f);
if (nbytes != to_read) {
res = 0;
if (nbytes > 0)
printf("Warning: Read partial frame. Check your width & height!\n");
}
return res;
}
static int read_dummy_frame(vpx_image_t *img) {
size_t to_read;
to_read = img->w * img->h * 3 / 2;
memset(img->planes[0], 129, to_read);
return 1;
}
static void write_ivf_file_header(FILE *outfile, const vpx_codec_enc_cfg_t *cfg,
int frame_cnt) {
char header[32];
if (cfg->g_pass != VPX_RC_ONE_PASS && cfg->g_pass != VPX_RC_LAST_PASS) return;
header[0] = 'D';
header[1] = 'K';
header[2] = 'I';
header[3] = 'F';
mem_put_le16(header + 4, 0); /* version */
mem_put_le16(header + 6, 32); /* headersize */
mem_put_le32(header + 8, fourcc); /* headersize */
mem_put_le16(header + 12, cfg->g_w); /* width */
mem_put_le16(header + 14, cfg->g_h); /* height */
mem_put_le32(header + 16, cfg->g_timebase.den); /* rate */
mem_put_le32(header + 20, cfg->g_timebase.num); /* scale */
mem_put_le32(header + 24, frame_cnt); /* length */
mem_put_le32(header + 28, 0); /* unused */
(void)fwrite(header, 1, 32, outfile);
}
static void write_ivf_frame_header(FILE *outfile,
const vpx_codec_cx_pkt_t *pkt) {
char header[12];
vpx_codec_pts_t pts;
if (pkt->kind != VPX_CODEC_CX_FRAME_PKT) return;
pts = pkt->data.frame.pts;
mem_put_le32(header, pkt->data.frame.sz);
mem_put_le32(header + 4, pts & 0xFFFFFFFF);
mem_put_le32(header + 8, pts >> 32);
(void)fwrite(header, 1, 12, outfile);
}
static void check_parameters() {
if (number_spatial_layers > 5) die("Cannot support more than 5 layers");
}
static void parse_command_line(int argc, char **argv,
vpx_codec_enc_cfg_t *cfg) {
unsigned int width = 1920;
unsigned int height = 1080;
unsigned int timebase_num = 1;
unsigned int timebase_den = 60;
unsigned int bitrate = 1000;
int c;
vpx_codec_err_t res;
opterr = 0;
while ((c = getopt(argc, argv, "f:w:h:n:d:b:s:l:p:")) != -1) switch (c) {
case 'f':
number_frames_to_code = atoi(optarg);
break;
case 'w':
width = atoi(optarg);
break;
case 'h':
height = atoi(optarg);
break;
case 'n':
timebase_num = atoi(optarg);
break;
case 'd':
timebase_den = atoi(optarg);
break;
case 'b':
bitrate = atoi(optarg);
break;
case 's':
number_frames_to_skip = atoi(optarg);
break;
case 'l':
number_spatial_layers = atoi(optarg);
break;
case 'p':
key_period = atoi(optarg);
break;
case '?':
usage(argv[0]);
}
// Parse required parameters
if (argc - optind != 2) {
usage(argv[0]);
}
input_filename = argv[optind];
output_filename = argv[optind + 1];
if (width < 16 || width % 2 || height < 16 || height % 2)
die("Invalid resolution: %d x %d", width, height);
/* Populate encoder configuration */
res = vpx_codec_enc_config_default(interface, cfg, 0);
if (res) {
die("Failed to get config: %s\n", vpx_codec_err_to_string(res));
}
printf(
"Codec %s\nframes: %d, skip: %d, layers: %d\n"
"width %d, height: %d, \n"
"num: %d, den: %d, bitrate: %d, \n"
"key period: %d \n",
vpx_codec_iface_name(interface), number_frames_to_code,
number_frames_to_skip, number_spatial_layers, width, height, timebase_num,
timebase_den, bitrate, key_period);
// Do minimal check at the application level. Encoder parameters will be
// checked internally
check_parameters();
cfg->rc_target_bitrate = bitrate;
cfg->g_w = width;
cfg->g_h = height;
cfg->g_timebase.num = timebase_num;
cfg->g_timebase.den = timebase_den;
cfg->ss_number_layers = number_spatial_layers;
}
static void set_default_configuration(vpx_codec_enc_cfg_t *cfg) {
/* Real time parameters */
cfg->rc_dropframe_thresh = 0;
cfg->rc_end_usage = VPX_CBR;
cfg->rc_resize_allowed = 0;
cfg->rc_min_quantizer = 33;
cfg->rc_max_quantizer = 33;
cfg->rc_undershoot_pct = 100;
cfg->rc_overshoot_pct = 15;
cfg->rc_buf_initial_sz = 500;
cfg->rc_buf_optimal_sz = 600;
cfg->rc_buf_sz = 1000;
/* Enable error resilient mode */
cfg->g_error_resilient = 1;
cfg->g_lag_in_frames = 0;
/* Disable automatic keyframe placement */
cfg->kf_mode = VPX_KF_DISABLED;
cfg->kf_min_dist = cfg->kf_max_dist = 3000;
}
static void initialize_codec(vpx_codec_ctx_t *codec, vpx_codec_enc_cfg_t *cfg) {
int max_intra_size_pct;
/* Initialize codec */
if (vpx_codec_enc_init(codec, interface, cfg, VPX_CODEC_USE_PSNR))
die_codec(codec, "Failed to initialize encoder");
vpx_codec_control(codec, VP9E_SET_SVC, 1);
/* Cap CPU & first I-frame size */
vpx_codec_control(codec, VP8E_SET_CPUUSED, 1);
vpx_codec_control(codec, VP8E_SET_STATIC_THRESHOLD, 1);
vpx_codec_control(codec, VP8E_SET_NOISE_SENSITIVITY, 1);
vpx_codec_control(codec, VP8E_SET_TOKEN_PARTITIONS, 1);
max_intra_size_pct =
(int)(((double)cfg->rc_buf_optimal_sz * 0.5) *
((double)cfg->g_timebase.den / cfg->g_timebase.num) / 10.0);
/* printf ("max_intra_size_pct=%d\n", max_intra_size_pct); */
vpx_codec_control(codec, VP8E_SET_MAX_INTRA_BITRATE_PCT, max_intra_size_pct);
}
static int calculate_layer(int frame_cnt, int number_spatial_layers) {
if (frame_cnt == 0)
return 0;
else
return (frame_cnt + number_spatial_layers - 1) % number_spatial_layers;
}
static void switch_to_layer(int layer, unsigned int initial_width,
unsigned int initial_height,
vpx_codec_ctx_t *codec) {
// Set layer size
int scaling_factor_num[MAX_LAYERS] = {2, 1, 4, 2, 1};
int scaling_factor_den[MAX_LAYERS] = {9, 3, 9, 3, 1};
int quantizer[MAX_LAYERS] = {60, 53, 39, 33, 27};
unsigned int current_width;
unsigned int current_height;
current_width = initial_width *
scaling_factor_num[layer + 5 - number_spatial_layers] /
scaling_factor_den[layer + 5 - number_spatial_layers];
current_height = initial_height *
scaling_factor_num[layer + 5 - number_spatial_layers] /
scaling_factor_den[layer + 5 - number_spatial_layers];
current_width += current_width % 2;
current_height += current_height % 2;
vpx_codec_control(codec, VP9E_SET_WIDTH, &current_width);
vpx_codec_control(codec, VP9E_SET_HEIGHT, &current_height);
// Set layer context
vpx_codec_control(codec, VP9E_SET_LAYER, &layer);
vpx_codec_control(codec, VP9E_SET_MAX_Q,
quantizer[layer + 5 - number_spatial_layers]);
vpx_codec_control(codec, VP9E_SET_MIN_Q,
quantizer[layer + 5 - number_spatial_layers]);
}
static int get_flag(int is_I_frame_in_layer, int layer, ENCODING_MODE mode) {
// First layer
switch (mode) {
case INTER_LAYER_PREDICTION_I:
if (is_I_frame_in_layer && layer == 0) return VPX_EFLAG_FORCE_KF;
if (layer == 0)
return VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF |
VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF;
else if (is_I_frame_in_layer)
return VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF |
VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_LAST;
else
return VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF |
VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF;
break;
case INTER_LAYER_PREDICTION_IP:
if (is_I_frame_in_layer && layer == 0) return VPX_EFLAG_FORCE_KF;
if (layer == 0)
return VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF |
VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF;
else if (is_I_frame_in_layer)
return VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF |
VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_LAST;
else
return VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_REF_GF;
break;
case USE_GOLDEN_FRAME:
if (is_I_frame_in_layer && layer == 0) return VPX_EFLAG_FORCE_KF;
if (2 * number_spatial_layers - NUM_BUFFERS <= layer) {
if (layer == 0)
return VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF |
VP8_EFLAG_NO_REF_ARF;
else if (is_I_frame_in_layer)
return VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_REF_GF |
VP8_EFLAG_NO_REF_LAST;
else
return VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF;
} else {
if (layer == 0)
return VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF |
VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF;
else if (is_I_frame_in_layer)
return VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF |
VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_LAST;
else
return VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF |
VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF;
}
break;
default:
return VPX_EFLAG_FORCE_KF;
}
}
int main(int argc, char **argv) {
FILE *infile, *outfile[MAX_LAYERS];
vpx_codec_ctx_t codec;
vpx_codec_enc_cfg_t cfg;
int frame_cnt = 0;
vpx_image_t raw;
int frame_avail = 1;
int got_data = 0;
int i;
int frames_in_layer[MAX_LAYERS] = {0};
clock_t before;
clock_t after;
int pts = 0; /* PTS starts at 0 */
int frame_duration = 1; /* 1 timebase tick per frame */
parse_command_line(argc, argv, &cfg);
// Allocate image buffer
if (!vpx_img_alloc(&raw, VPX_IMG_FMT_I420, cfg.g_w, cfg.g_h, 32))
die("Failed to allocate image", cfg.g_w, cfg.g_h);
set_default_configuration(&cfg);
/* Open input file */
if (!(infile = fopen(input_filename, "rb")))
die("Failed to open %s for reading", argv[1]);
/* Open output file */
for (i = 0; i < number_spatial_layers; i++) {
char file_name[512];
snprintf(file_name, sizeof(file_name), "%s_%d.ivf", output_filename, i);
if (!(outfile[i] = fopen(file_name, "wb")))
die("Failed to open %s for writing", file_name);
write_ivf_file_header(outfile[i], &cfg, 0);
}
initialize_codec(&codec, &cfg);
// skip initial frames
for (i = 0; i < number_frames_to_skip; i++) {
read_frame(infile, &raw);
}
before = clock();
// Encoding frames
while ((frame_avail || got_data) &&
frame_cnt <= number_frames_to_code * number_spatial_layers) {
int flags = 0;
vpx_codec_iter_t iter = NULL;
const vpx_codec_cx_pkt_t *pkt;
int layer = calculate_layer(frame_cnt, number_spatial_layers);
int is_I_frame_in_layer =
(((frame_cnt - 1) / number_spatial_layers % key_period) == 0);
int is_dummy = (frame_cnt == 0);
if (is_dummy) { // Dummy frame
flags = VPX_EFLAG_FORCE_KF;
frame_avail = read_dummy_frame(&raw);
} else { // Regular frame
// Read a new frame only at the base layer
if (layer == 0) frame_avail = read_frame(infile, &raw);
switch_to_layer(layer, cfg.g_w, cfg.g_h, &codec);
flags = get_flag(is_I_frame_in_layer, layer, INTER_LAYER_PREDICTION_I);
}
// Actual Encoding
if (vpx_codec_encode(&codec, frame_avail ? &raw : NULL, pts, 1, flags,
VPX_DL_REALTIME))
die_codec(&codec, "Failed to encode frame");
got_data = 0;
// Process data / Get PSNR statistics
while ((pkt = vpx_codec_get_cx_data(&codec, &iter))) {
got_data = 1;
switch (pkt->kind) {
case VPX_CODEC_CX_FRAME_PKT:
for (i = layer; i < number_spatial_layers; i++) {
write_ivf_frame_header(outfile[i], pkt);
(void)fwrite(pkt->data.frame.buf, 1, pkt->data.frame.sz,
outfile[i]);
frames_in_layer[i]++;
}
break;
case VPX_CODEC_PSNR_PKT:
if (frame_cnt != 0)
printf(
"Processed Frame %d, layer %d, PSNR(Total/Y/U/V): "
"%2.3f %2.3f %2.3f %2.3f \n",
(frame_cnt - 1) / number_spatial_layers + 1, layer,
pkt->data.psnr.psnr[0], pkt->data.psnr.psnr[1],
pkt->data.psnr.psnr[2], pkt->data.psnr.psnr[3]);
break;
default:
break;
}
}
frame_cnt++;
// TODO(ivan): Modify ts later if(!layer)
pts += frame_duration;
}
// end while
after = clock();
printf("Processed %d frames in different resolutions in %ld ms.\n",
frame_cnt - 1, (int)(after - before) / (CLOCKS_PER_SEC / 1000));
fclose(infile);
if (vpx_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
/* Try to rewrite the output file headers with the actual frame count */
for (i = 0; i < number_spatial_layers; i++) {
if (!fseek(outfile[i], 0, SEEK_SET)) {
write_ivf_file_header(outfile[i], &cfg, frames_in_layer[i]);
}
fclose(outfile[i]);
}
return EXIT_SUCCESS;
}
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