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/*
* Copyright (c) 2013 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.
*/
/**
* @file
* VP9 SVC encoding support via libvpx
*/
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define VPX_DISABLE_CTRL_TYPECHECKS 1
#define VPX_CODEC_DISABLE_COMPAT 1
#include "vpx/svc_context.h"
#include "vpx/vp8cx.h"
#include "vpx/vpx_encoder.h"
#ifdef __MINGW32__
#define strtok_r strtok_s
#ifndef MINGW_HAS_SECURE_API
// proto from /usr/x86_64-w64-mingw32/include/sec_api/string_s.h
_CRTIMP char *__cdecl strtok_s(char *str, const char *delim, char **context);
#endif /* MINGW_HAS_SECURE_API */
#endif /* __MINGW32__ */
#ifdef _MSC_VER
#define strdup _strdup
#define strtok_r strtok_s
#endif
#define SVC_REFERENCE_FRAMES 8
#define SUPERFRAME_SLOTS (8)
#define SUPERFRAME_BUFFER_SIZE (SUPERFRAME_SLOTS * sizeof(uint32_t) + 2)
#define OPTION_BUFFER_SIZE 256
static const char *DEFAULT_QUANTIZER_VALUES = "60,53,39,33,27";
static const char *DEFAULT_SCALE_FACTORS = "4/16,5/16,7/16,11/16,16/16";
typedef struct SvcInternal {
char options[OPTION_BUFFER_SIZE]; // set by vpx_svc_set_options
char quantizers[OPTION_BUFFER_SIZE]; // set by vpx_svc_set_quantizers
char scale_factors[OPTION_BUFFER_SIZE]; // set by vpx_svc_set_scale_factors
// values extracted from option, quantizers
int scaling_factor_num[VPX_SS_MAX_LAYERS];
int scaling_factor_den[VPX_SS_MAX_LAYERS];
int quantizer[VPX_SS_MAX_LAYERS];
// accumulated statistics
double psnr_in_layer[VPX_SS_MAX_LAYERS];
uint32_t bytes_in_layer[VPX_SS_MAX_LAYERS];
// codec encoding values
int width; // width of highest layer
int height; // height of highest layer
int kf_dist; // distance between keyframes
// state variables
int encode_frame_count;
int frame_within_gop;
vpx_enc_frame_flags_t enc_frame_flags;
int layers;
int layer;
int is_keyframe;
size_t frame_size;
size_t buffer_size;
void *buffer;
char message_buffer[2048];
vpx_codec_ctx_t *codec_ctx;
} SvcInternal;
// Superframe is used to generate an index of individual frames (i.e., layers)
struct Superframe {
int count;
uint32_t sizes[SUPERFRAME_SLOTS];
uint32_t magnitude;
uint8_t buffer[SUPERFRAME_BUFFER_SIZE];
size_t index_size;
};
// One encoded frame layer
struct LayerData {
void *buf; // compressed data buffer
size_t size; // length of compressed data
struct LayerData *next;
};
// create LayerData from encoder output
static struct LayerData *ld_create(void *buf, size_t size) {
struct LayerData *const layer_data =
(struct LayerData *)malloc(sizeof(*layer_data));
if (layer_data == NULL) {
return NULL;
}
layer_data->buf = malloc(size);
if (layer_data->buf == NULL) {
free(layer_data);
return NULL;
}
memcpy(layer_data->buf, buf, size);
layer_data->size = size;
return layer_data;
}
// free LayerData
static void ld_free(struct LayerData *layer_data) {
if (layer_data) {
if (layer_data->buf) {
free(layer_data->buf);
layer_data->buf = NULL;
}
free(layer_data);
}
}
// add layer data to list
static void ld_list_add(struct LayerData **list, struct LayerData *layer_data) {
struct LayerData **p = list;
while (*p != NULL) p = &(*p)->next;
*p = layer_data;
layer_data->next = NULL;
}
// get accumulated size of layer data
static size_t ld_list_get_buffer_size(struct LayerData *list) {
struct LayerData *p;
size_t size = 0;
for (p = list; p != NULL; p = p->next) {
size += p->size;
}
return size;
}
// copy layer data to buffer
static void ld_list_copy_to_buffer(struct LayerData *list, uint8_t *buffer) {
struct LayerData *p;
for (p = list; p != NULL; p = p->next) {
buffer[0] = 1;
memcpy(buffer, p->buf, p->size);
buffer += p->size;
}
}
// free layer data list
static void ld_list_free(struct LayerData *list) {
struct LayerData *p = list;
while (p) {
list = list->next;
ld_free(p);
p = list;
}
}
static void sf_create_index(struct Superframe *sf) {
uint8_t marker = 0xc0;
int i;
uint32_t mag, mask;
uint8_t *bufp;
if (sf->count == 0 || sf->count >= 8) return;
// Add the number of frames to the marker byte
marker |= sf->count - 1;
// Choose the magnitude
for (mag = 0, mask = 0xff; mag < 4; ++mag) {
if (sf->magnitude < mask) break;
mask <<= 8;
mask |= 0xff;
}
marker |= mag << 3;
// Write the index
sf->index_size = 2 + (mag + 1) * sf->count;
bufp = sf->buffer;
*bufp++ = marker;
for (i = 0; i < sf->count; ++i) {
int this_sz = sf->sizes[i];
uint32_t j;
for (j = 0; j <= mag; ++j) {
*bufp++ = this_sz & 0xff;
this_sz >>= 8;
}
}
*bufp++ = marker;
}
static SvcInternal *get_svc_internal(SvcContext *svc_ctx) {
if (svc_ctx == NULL) return NULL;
if (svc_ctx->internal == NULL) {
SvcInternal *const si = (SvcInternal *)malloc(sizeof(*si));
if (si != NULL) {
memset(si, 0, sizeof(*si));
}
svc_ctx->internal = si;
}
return (SvcInternal *)svc_ctx->internal;
}
static const SvcInternal *get_const_svc_internal(const SvcContext *svc_ctx) {
if (svc_ctx == NULL) return NULL;
return (const SvcInternal *)svc_ctx->internal;
}
static void svc_log_reset(SvcContext *svc_ctx) {
SvcInternal *const si = (SvcInternal *)svc_ctx->internal;
si->message_buffer[0] = '\0';
}
static int svc_log(SvcContext *svc_ctx, int level, const char *fmt, ...) {
char buf[512];
int retval = 0;
va_list ap;
SvcInternal *const si = get_svc_internal(svc_ctx);
if (level > svc_ctx->log_level) {
return retval;
}
va_start(ap, fmt);
retval = vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
if (svc_ctx->log_print) {
printf("%s", buf);
} else {
strncat(si->message_buffer, buf,
sizeof(si->message_buffer) - strlen(si->message_buffer) - 1);
}
if (level == SVC_LOG_ERROR) {
si->codec_ctx->err_detail = si->message_buffer;
}
return retval;
}
static vpx_codec_err_t set_option_encoding_mode(SvcContext *svc_ctx,
const char *value_str) {
if (strcmp(value_str, "i") == 0) {
svc_ctx->encoding_mode = INTER_LAYER_PREDICTION_I;
} else if (strcmp(value_str, "alt-ip") == 0) {
svc_ctx->encoding_mode = ALT_INTER_LAYER_PREDICTION_IP;
} else if (strcmp(value_str, "ip") == 0) {
svc_ctx->encoding_mode = INTER_LAYER_PREDICTION_IP;
} else if (strcmp(value_str, "gf") == 0) {
svc_ctx->encoding_mode = USE_GOLDEN_FRAME;
} else {
svc_log(svc_ctx, SVC_LOG_ERROR, "invalid encoding mode: %s", value_str);
return VPX_CODEC_INVALID_PARAM;
}
return VPX_CODEC_OK;
}
static vpx_codec_err_t parse_quantizer_values(SvcContext *svc_ctx,
const char *quantizer_values) {
char *input_string;
char *token;
const char *delim = ",";
char *save_ptr;
int found = 0;
int i, q;
vpx_codec_err_t res = VPX_CODEC_OK;
SvcInternal *const si = get_svc_internal(svc_ctx);
if (quantizer_values == NULL || strlen(quantizer_values) == 0) {
input_string = strdup(DEFAULT_QUANTIZER_VALUES);
} else {
input_string = strdup(quantizer_values);
}
token = strtok_r(input_string, delim, &save_ptr);
for (i = 0; i < svc_ctx->spatial_layers; ++i) {
if (token != NULL) {
q = atoi(token);
if (q <= 0 || q > 100) {
svc_log(svc_ctx, SVC_LOG_ERROR,
"svc-quantizer-values: invalid value %s\n", token);
res = VPX_CODEC_INVALID_PARAM;
break;
}
token = strtok_r(NULL, delim, &save_ptr);
found = i + 1;
} else {
q = 0;
}
si->quantizer[i + VPX_SS_MAX_LAYERS - svc_ctx->spatial_layers] = q;
}
if (res == VPX_CODEC_OK && found != svc_ctx->spatial_layers) {
svc_log(svc_ctx, SVC_LOG_ERROR,
"svc: quantizers: %d values required, but only %d specified\n",
svc_ctx->spatial_layers, found);
res = VPX_CODEC_INVALID_PARAM;
}
free(input_string);
return res;
}
static void log_invalid_scale_factor(SvcContext *svc_ctx, const char *value) {
svc_log(svc_ctx, SVC_LOG_ERROR, "svc scale-factors: invalid value %s\n",
value);
}
static vpx_codec_err_t parse_scale_factors(SvcContext *svc_ctx,
const char *scale_factors) {
char *input_string;
char *token;
const char *delim = ",";
char *save_ptr;
int found = 0;
int i;
int64_t num, den;
vpx_codec_err_t res = VPX_CODEC_OK;
SvcInternal *const si = get_svc_internal(svc_ctx);
if (scale_factors == NULL || strlen(scale_factors) == 0) {
input_string = strdup(DEFAULT_SCALE_FACTORS);
} else {
input_string = strdup(scale_factors);
}
token = strtok_r(input_string, delim, &save_ptr);
for (i = 0; i < svc_ctx->spatial_layers; ++i) {
num = den = 0;
if (token != NULL) {
num = strtol(token, &token, 10);
if (num <= 0) {
log_invalid_scale_factor(svc_ctx, token);
res = VPX_CODEC_INVALID_PARAM;
break;
}
if (*token++ != '/') {
log_invalid_scale_factor(svc_ctx, token);
res = VPX_CODEC_INVALID_PARAM;
break;
}
den = strtol(token, &token, 10);
if (den <= 0) {
log_invalid_scale_factor(svc_ctx, token);
res = VPX_CODEC_INVALID_PARAM;
break;
}
token = strtok_r(NULL, delim, &save_ptr);
found = i + 1;
}
si->scaling_factor_num[i + VPX_SS_MAX_LAYERS - svc_ctx->spatial_layers] =
(int)num;
si->scaling_factor_den[i + VPX_SS_MAX_LAYERS - svc_ctx->spatial_layers] =
(int)den;
}
if (res == VPX_CODEC_OK && found != svc_ctx->spatial_layers) {
svc_log(svc_ctx, SVC_LOG_ERROR,
"svc: scale-factors: %d values required, but only %d specified\n",
svc_ctx->spatial_layers, found);
res = VPX_CODEC_INVALID_PARAM;
}
free(input_string);
return res;
}
/**
* Parse SVC encoding options
* Format: encoding-mode=<svc_mode>,layers=<layer_count>
* scale-factors=<n1>/<d1>,<n2>/<d2>,...
* quantizers=<q1>,<q2>,...
* svc_mode = [i|ip|alt_ip|gf]
*/
static vpx_codec_err_t parse_options(SvcContext *svc_ctx, const char *options) {
char *input_string;
char *option_name;
char *option_value;
char *input_ptr;
vpx_codec_err_t res = VPX_CODEC_OK;
if (options == NULL) return VPX_CODEC_OK;
input_string = strdup(options);
// parse option name
option_name = strtok_r(input_string, "=", &input_ptr);
while (option_name != NULL) {
// parse option value
option_value = strtok_r(NULL, " ", &input_ptr);
if (option_value == NULL) {
svc_log(svc_ctx, SVC_LOG_ERROR, "option missing value: %s\n",
option_name);
res = VPX_CODEC_INVALID_PARAM;
break;
}
if (strcmp("encoding-mode", option_name) == 0) {
res = set_option_encoding_mode(svc_ctx, option_value);
if (res != VPX_CODEC_OK) break;
} else if (strcmp("layers", option_name) == 0) {
svc_ctx->spatial_layers = atoi(option_value);
} else if (strcmp("scale-factors", option_name) == 0) {
res = parse_scale_factors(svc_ctx, option_value);
if (res != VPX_CODEC_OK) break;
} else if (strcmp("quantizers", option_name) == 0) {
res = parse_quantizer_values(svc_ctx, option_value);
if (res != VPX_CODEC_OK) break;
} else {
svc_log(svc_ctx, SVC_LOG_ERROR, "invalid option: %s\n", option_name);
res = VPX_CODEC_INVALID_PARAM;
break;
}
option_name = strtok_r(NULL, "=", &input_ptr);
}
free(input_string);
return res;
}
vpx_codec_err_t vpx_svc_set_options(SvcContext *svc_ctx, const char *options) {
SvcInternal *const si = get_svc_internal(svc_ctx);
if (svc_ctx == NULL || options == NULL || si == NULL) {
return VPX_CODEC_INVALID_PARAM;
}
strncpy(si->options, options, sizeof(si->options));
si->options[sizeof(si->options) - 1] = '\0';
return VPX_CODEC_OK;
}
vpx_codec_err_t vpx_svc_set_quantizers(SvcContext *svc_ctx,
const char *quantizers) {
SvcInternal *const si = get_svc_internal(svc_ctx);
if (svc_ctx == NULL || quantizers == NULL || si == NULL) {
return VPX_CODEC_INVALID_PARAM;
}
strncpy(si->quantizers, quantizers, sizeof(si->quantizers));
si->quantizers[sizeof(si->quantizers) - 1] = '\0';
return VPX_CODEC_OK;
}
vpx_codec_err_t vpx_svc_set_scale_factors(SvcContext *svc_ctx,
const char *scale_factors) {
SvcInternal *const si = get_svc_internal(svc_ctx);
if (svc_ctx == NULL || scale_factors == NULL || si == NULL) {
return VPX_CODEC_INVALID_PARAM;
}
strncpy(si->scale_factors, scale_factors, sizeof(si->scale_factors));
si->scale_factors[sizeof(si->scale_factors) - 1] = '\0';
return VPX_CODEC_OK;
}
vpx_codec_err_t vpx_svc_init(SvcContext *svc_ctx, vpx_codec_ctx_t *codec_ctx,
vpx_codec_iface_t *iface,
vpx_codec_enc_cfg_t *enc_cfg) {
int max_intra_size_pct;
vpx_codec_err_t res;
SvcInternal *const si = get_svc_internal(svc_ctx);
if (svc_ctx == NULL || codec_ctx == NULL || iface == NULL ||
enc_cfg == NULL) {
return VPX_CODEC_INVALID_PARAM;
}
if (si == NULL) return VPX_CODEC_MEM_ERROR;
si->codec_ctx = codec_ctx;
si->width = enc_cfg->g_w;
si->height = enc_cfg->g_h;
if (enc_cfg->kf_max_dist < 2) {
svc_log(svc_ctx, SVC_LOG_ERROR, "key frame distance too small: %d\n",
enc_cfg->kf_max_dist);
return VPX_CODEC_INVALID_PARAM;
}
si->kf_dist = enc_cfg->kf_max_dist;
if (svc_ctx->spatial_layers == 0)
svc_ctx->spatial_layers = VPX_SS_DEFAULT_LAYERS;
if (svc_ctx->spatial_layers < 1 ||
svc_ctx->spatial_layers > VPX_SS_MAX_LAYERS) {
svc_log(svc_ctx, SVC_LOG_ERROR, "spatial layers: invalid value: %d\n",
svc_ctx->spatial_layers);
return VPX_CODEC_INVALID_PARAM;
}
// use SvcInternal value for number of layers to enable forcing single layer
// for first frame
si->layers = svc_ctx->spatial_layers;
res = parse_quantizer_values(svc_ctx, si->quantizers);
if (res != VPX_CODEC_OK) return res;
res = parse_scale_factors(svc_ctx, si->scale_factors);
if (res != VPX_CODEC_OK) return res;
// parse aggregate command line options
res = parse_options(svc_ctx, si->options);
if (res != VPX_CODEC_OK) return res;
// modify encoder configuration
enc_cfg->ss_number_layers = si->layers;
enc_cfg->ts_number_layers = 1; // Temporal layers not used in this encoder.
enc_cfg->kf_mode = VPX_KF_DISABLED;
enc_cfg->g_pass = VPX_RC_ONE_PASS;
// Lag in frames not currently supported
enc_cfg->g_lag_in_frames = 0;
// TODO(ivanmaltz): determine if these values need to be set explicitly for
// svc, or if the normal default/override mechanism can be used
enc_cfg->rc_dropframe_thresh = 0;
enc_cfg->rc_end_usage = VPX_CBR;
enc_cfg->rc_resize_allowed = 0;
enc_cfg->rc_min_quantizer = 33;
enc_cfg->rc_max_quantizer = 33;
enc_cfg->rc_undershoot_pct = 100;
enc_cfg->rc_overshoot_pct = 15;
enc_cfg->rc_buf_initial_sz = 500;
enc_cfg->rc_buf_optimal_sz = 600;
enc_cfg->rc_buf_sz = 1000;
enc_cfg->g_error_resilient = 1;
// Initialize codec
res = vpx_codec_enc_init(codec_ctx, iface, enc_cfg, VPX_CODEC_USE_PSNR);
if (res != VPX_CODEC_OK) {
svc_log(svc_ctx, SVC_LOG_ERROR, "svc_enc_init error\n");
return res;
}
vpx_codec_control(codec_ctx, VP9E_SET_SVC, 1);
vpx_codec_control(codec_ctx, VP8E_SET_CPUUSED, 1);
vpx_codec_control(codec_ctx, VP8E_SET_STATIC_THRESHOLD, 1);
vpx_codec_control(codec_ctx, VP8E_SET_NOISE_SENSITIVITY, 1);
vpx_codec_control(codec_ctx, VP8E_SET_TOKEN_PARTITIONS, 1);
max_intra_size_pct =
(int)(((double)enc_cfg->rc_buf_optimal_sz * 0.5) *
((double)enc_cfg->g_timebase.den / enc_cfg->g_timebase.num) / 10.0);
vpx_codec_control(codec_ctx, VP8E_SET_MAX_INTRA_BITRATE_PCT,
max_intra_size_pct);
return VPX_CODEC_OK;
}
// SVC Algorithm flags - these get mapped to VP8_EFLAG_* defined in vp8cx.h
// encoder should reference the last frame
#define USE_LAST (1 << 0)
// encoder should reference the alt ref frame
#define USE_ARF (1 << 1)
// encoder should reference the golden frame
#define USE_GF (1 << 2)
// encoder should copy current frame to the last frame buffer
#define UPDATE_LAST (1 << 3)
// encoder should copy current frame to the alt ref frame buffer
#define UPDATE_ARF (1 << 4)
// encoder should copy current frame to the golden frame
#define UPDATE_GF (1 << 5)
static int map_vp8_flags(int svc_flags) {
int flags = 0;
if (!(svc_flags & USE_LAST)) flags |= VP8_EFLAG_NO_REF_LAST;
if (!(svc_flags & USE_ARF)) flags |= VP8_EFLAG_NO_REF_ARF;
if (!(svc_flags & USE_GF)) flags |= VP8_EFLAG_NO_REF_GF;
if (svc_flags & UPDATE_LAST) {
// last is updated automatically
} else {
flags |= VP8_EFLAG_NO_UPD_LAST;
}
if (svc_flags & UPDATE_ARF) {
flags |= VP8_EFLAG_FORCE_ARF;
} else {
flags |= VP8_EFLAG_NO_UPD_ARF;
}
if (svc_flags & UPDATE_GF) {
flags |= VP8_EFLAG_FORCE_GF;
} else {
flags |= VP8_EFLAG_NO_UPD_GF;
}
return flags;
}
static void calculate_enc_frame_flags(SvcContext *svc_ctx) {
vpx_enc_frame_flags_t flags = VPX_EFLAG_FORCE_KF;
SvcInternal *const si = get_svc_internal(svc_ctx);
const int is_keyframe = (si->frame_within_gop == 0);
// keyframe layer zero is identical for all modes
if (is_keyframe && si->layer == 0) {
si->enc_frame_flags = VPX_EFLAG_FORCE_KF;
return;
}
switch (svc_ctx->encoding_mode) {
case ALT_INTER_LAYER_PREDICTION_IP:
if (si->layer == 0) {
flags = map_vp8_flags(USE_LAST | UPDATE_LAST);
} else if (is_keyframe) {
if (si->layer == si->layers - 1) {
flags = map_vp8_flags(USE_ARF | UPDATE_LAST);
} else {
flags = map_vp8_flags(USE_ARF | UPDATE_LAST | UPDATE_GF);
}
} else {
flags = map_vp8_flags(USE_LAST | USE_ARF | UPDATE_LAST);
}
break;
case INTER_LAYER_PREDICTION_I:
if (si->layer == 0) {
flags = map_vp8_flags(USE_LAST | UPDATE_LAST);
} else if (is_keyframe) {
flags = map_vp8_flags(USE_ARF | UPDATE_LAST);
} else {
flags = map_vp8_flags(USE_LAST | UPDATE_LAST);
}
break;
case INTER_LAYER_PREDICTION_IP:
if (si->layer == 0) {
flags = map_vp8_flags(USE_LAST | UPDATE_LAST);
} else if (is_keyframe) {
flags = map_vp8_flags(USE_ARF | UPDATE_LAST);
} else {
flags = map_vp8_flags(USE_LAST | USE_ARF | UPDATE_LAST);
}
break;
case USE_GOLDEN_FRAME:
if (2 * si->layers - SVC_REFERENCE_FRAMES <= si->layer) {
if (si->layer == 0) {
flags = map_vp8_flags(USE_LAST | USE_GF | UPDATE_LAST);
} else if (is_keyframe) {
flags = map_vp8_flags(USE_ARF | UPDATE_LAST | UPDATE_GF);
} else {
flags = map_vp8_flags(USE_LAST | USE_ARF | USE_GF | UPDATE_LAST);
}
} else {
if (si->layer == 0) {
flags = map_vp8_flags(USE_LAST | UPDATE_LAST);
} else if (is_keyframe) {
flags = map_vp8_flags(USE_ARF | UPDATE_LAST);
} else {
flags = map_vp8_flags(USE_LAST | UPDATE_LAST);
}
}
break;
default:
svc_log(svc_ctx, SVC_LOG_ERROR, "unexpected encoding mode: %d\n",
svc_ctx->encoding_mode);
break;
}
si->enc_frame_flags = flags;
}
vpx_codec_err_t vpx_svc_get_layer_resolution(const SvcContext *svc_ctx,
int layer,
unsigned int *width,
unsigned int *height) {
int w, h, index, num, den;
const SvcInternal *const si = get_const_svc_internal(svc_ctx);
if (svc_ctx == NULL || si == NULL || width == NULL || height == NULL) {
return VPX_CODEC_INVALID_PARAM;
}
if (layer < 0 || layer >= si->layers) return VPX_CODEC_INVALID_PARAM;
index = layer + VPX_SS_MAX_LAYERS - si->layers;
num = si->scaling_factor_num[index];
den = si->scaling_factor_den[index];
if (num == 0 || den == 0) return VPX_CODEC_INVALID_PARAM;
w = si->width * num / den;
h = si->height * num / den;
// make height and width even to make chrome player happy
w += w % 2;
h += h % 2;
*width = w;
*height = h;
return VPX_CODEC_OK;
}
static void set_svc_parameters(SvcContext *svc_ctx,
vpx_codec_ctx_t *codec_ctx) {
int layer, layer_index;
vpx_svc_parameters_t svc_params;
SvcInternal *const si = get_svc_internal(svc_ctx);
memset(&svc_params, 0, sizeof(svc_params));
svc_params.temporal_layer = 0;
svc_params.spatial_layer = si->layer;
svc_params.flags = si->enc_frame_flags;
layer = si->layer;
if (svc_ctx->encoding_mode == ALT_INTER_LAYER_PREDICTION_IP &&
si->frame_within_gop == 0) {
// layers 1 & 3 don't exist in this mode, use the higher one
if (layer == 0 || layer == 2) {
layer += 1;
}
}
if (VPX_CODEC_OK != vpx_svc_get_layer_resolution(svc_ctx, layer,
&svc_params.width,
&svc_params.height)) {
svc_log(svc_ctx, SVC_LOG_ERROR, "vpx_svc_get_layer_resolution failed\n");
}
layer_index = layer + VPX_SS_MAX_LAYERS - si->layers;
svc_params.min_quantizer = si->quantizer[layer_index];
svc_params.max_quantizer = si->quantizer[layer_index];
svc_params.distance_from_i_frame = si->frame_within_gop;
// Use buffer i for layer i LST
svc_params.lst_fb_idx = si->layer;
// Use buffer i-1 for layer i Alt (Inter-layer prediction)
if (si->layer != 0) {
const int use_higher_layer =
svc_ctx->encoding_mode == ALT_INTER_LAYER_PREDICTION_IP &&
si->frame_within_gop == 0;
svc_params.alt_fb_idx = use_higher_layer ? si->layer - 2 : si->layer - 1;
}
if (svc_ctx->encoding_mode == ALT_INTER_LAYER_PREDICTION_IP) {
svc_params.gld_fb_idx = si->layer + 1;
} else {
if (si->layer < 2 * si->layers - SVC_REFERENCE_FRAMES)
svc_params.gld_fb_idx = svc_params.lst_fb_idx;
else
svc_params.gld_fb_idx = 2 * si->layers - 1 - si->layer;
}
svc_log(svc_ctx, SVC_LOG_DEBUG, "SVC frame: %d, layer: %d, %dx%d, q: %d\n",
si->encode_frame_count, si->layer, svc_params.width,
svc_params.height, svc_params.min_quantizer);
if (svc_params.flags == VPX_EFLAG_FORCE_KF) {
svc_log(svc_ctx, SVC_LOG_DEBUG, "flags == VPX_EFLAG_FORCE_KF\n");
} else {
svc_log(
svc_ctx, SVC_LOG_DEBUG, "Using: LST/GLD/ALT [%2d|%2d|%2d]\n",
svc_params.flags & VP8_EFLAG_NO_REF_LAST ? -1 : svc_params.lst_fb_idx,
svc_params.flags & VP8_EFLAG_NO_REF_GF ? -1 : svc_params.gld_fb_idx,
svc_params.flags & VP8_EFLAG_NO_REF_ARF ? -1 : svc_params.alt_fb_idx);
svc_log(
svc_ctx, SVC_LOG_DEBUG, "Updating: LST/GLD/ALT [%2d|%2d|%2d]\n",
svc_params.flags & VP8_EFLAG_NO_UPD_LAST ? -1 : svc_params.lst_fb_idx,
svc_params.flags & VP8_EFLAG_NO_UPD_GF ? -1 : svc_params.gld_fb_idx,
svc_params.flags & VP8_EFLAG_NO_UPD_ARF ? -1 : svc_params.alt_fb_idx);
}
vpx_codec_control(codec_ctx, VP9E_SET_SVC_PARAMETERS, &svc_params);
}
/**
* Encode a frame into multiple layers
* Create a superframe containing the individual layers
*/
vpx_codec_err_t vpx_svc_encode(SvcContext *svc_ctx, vpx_codec_ctx_t *codec_ctx,
struct vpx_image *rawimg, vpx_codec_pts_t pts,
int64_t duration, int deadline) {
vpx_codec_err_t res;
vpx_codec_iter_t iter;
const vpx_codec_cx_pkt_t *cx_pkt;
struct LayerData *cx_layer_list = NULL;
struct LayerData *layer_data;
struct Superframe superframe;
SvcInternal *const si = get_svc_internal(svc_ctx);
if (svc_ctx == NULL || codec_ctx == NULL || rawimg == NULL || si == NULL) {
return VPX_CODEC_INVALID_PARAM;
}
memset(&superframe, 0, sizeof(superframe));
svc_log_reset(svc_ctx);
si->layers = svc_ctx->spatial_layers;
if (si->frame_within_gop >= si->kf_dist ||
si->encode_frame_count == 0) {
si->frame_within_gop = 0;
}
si->is_keyframe = (si->frame_within_gop == 0);
si->frame_size = 0;
svc_log(svc_ctx, SVC_LOG_DEBUG,
"vpx_svc_encode layers: %d, frame_count: %d, frame_within_gop: %d\n",
si->layers, si->encode_frame_count, si->frame_within_gop);
// encode each layer
for (si->layer = 0; si->layer < si->layers; ++si->layer) {
if (svc_ctx->encoding_mode == ALT_INTER_LAYER_PREDICTION_IP &&
si->is_keyframe && (si->layer == 1 || si->layer == 3)) {
svc_log(svc_ctx, SVC_LOG_DEBUG, "Skip encoding layer %d\n", si->layer);
continue;
}
calculate_enc_frame_flags(svc_ctx);
set_svc_parameters(svc_ctx, codec_ctx);
res = vpx_codec_encode(codec_ctx, rawimg, pts, (uint32_t)duration,
si->enc_frame_flags, deadline);
if (res != VPX_CODEC_OK) {
return res;
}
// save compressed data
iter = NULL;
while ((cx_pkt = vpx_codec_get_cx_data(codec_ctx, &iter))) {
switch (cx_pkt->kind) {
case VPX_CODEC_CX_FRAME_PKT: {
const uint32_t frame_pkt_size = (uint32_t)(cx_pkt->data.frame.sz);
si->bytes_in_layer[si->layer] += frame_pkt_size;
svc_log(svc_ctx, SVC_LOG_DEBUG,
"SVC frame: %d, layer: %d, size: %u\n",
si->encode_frame_count, si->layer, frame_pkt_size);
layer_data =
ld_create(cx_pkt->data.frame.buf, (size_t)frame_pkt_size);
if (layer_data == NULL) {
svc_log(svc_ctx, SVC_LOG_ERROR, "Error allocating LayerData\n");
return VPX_CODEC_OK;
}
ld_list_add(&cx_layer_list, layer_data);
// save layer size in superframe index
superframe.sizes[superframe.count++] = frame_pkt_size;
superframe.magnitude |= frame_pkt_size;
break;
}
case VPX_CODEC_PSNR_PKT: {
svc_log(svc_ctx, SVC_LOG_DEBUG,
"SVC frame: %d, layer: %d, PSNR(Total/Y/U/V): "
"%2.3f %2.3f %2.3f %2.3f \n",
si->encode_frame_count, si->layer,
cx_pkt->data.psnr.psnr[0], cx_pkt->data.psnr.psnr[1],
cx_pkt->data.psnr.psnr[2], cx_pkt->data.psnr.psnr[3]);
si->psnr_in_layer[si->layer] += cx_pkt->data.psnr.psnr[0];
break;
}
default: {
break;
}
}
}
}
// add superframe index to layer data list
sf_create_index(&superframe);
layer_data = ld_create(superframe.buffer, superframe.index_size);
ld_list_add(&cx_layer_list, layer_data);
// get accumulated size of layer data
si->frame_size = ld_list_get_buffer_size(cx_layer_list);
if (si->frame_size == 0) return VPX_CODEC_ERROR;
// all layers encoded, create single buffer with concatenated layers
if (si->frame_size > si->buffer_size) {
free(si->buffer);
si->buffer = malloc(si->frame_size);
if (si->buffer == NULL) {
ld_list_free(cx_layer_list);
return VPX_CODEC_MEM_ERROR;
}
si->buffer_size = si->frame_size;
}
// copy layer data into packet
ld_list_copy_to_buffer(cx_layer_list, (uint8_t *)si->buffer);
ld_list_free(cx_layer_list);
svc_log(svc_ctx, SVC_LOG_DEBUG, "SVC frame: %d, kf: %d, size: %d, pts: %d\n",
si->encode_frame_count, si->is_keyframe, (int)si->frame_size,
(int)pts);
++si->frame_within_gop;
++si->encode_frame_count;
return VPX_CODEC_OK;
}
const char *vpx_svc_get_message(const SvcContext *svc_ctx) {
const SvcInternal *const si = get_const_svc_internal(svc_ctx);
if (svc_ctx == NULL || si == NULL) return NULL;
return si->message_buffer;
}
void *vpx_svc_get_buffer(const SvcContext *svc_ctx) {
const SvcInternal *const si = get_const_svc_internal(svc_ctx);
if (svc_ctx == NULL || si == NULL) return NULL;
return si->buffer;
}
size_t vpx_svc_get_frame_size(const SvcContext *svc_ctx) {
const SvcInternal *const si = get_const_svc_internal(svc_ctx);
if (svc_ctx == NULL || si == NULL) return 0;
return si->frame_size;
}
int vpx_svc_get_encode_frame_count(const SvcContext *svc_ctx) {
const SvcInternal *const si = get_const_svc_internal(svc_ctx);
if (svc_ctx == NULL || si == NULL) return 0;
return si->encode_frame_count;
}
int vpx_svc_is_keyframe(const SvcContext *svc_ctx) {
const SvcInternal *const si = get_const_svc_internal(svc_ctx);
if (svc_ctx == NULL || si == NULL) return 0;
return si->is_keyframe;
}
void vpx_svc_set_keyframe(SvcContext *svc_ctx) {
SvcInternal *const si = get_svc_internal(svc_ctx);
if (svc_ctx == NULL || si == NULL) return;
si->frame_within_gop = 0;
}
// dump accumulated statistics and reset accumulated values
const char *vpx_svc_dump_statistics(SvcContext *svc_ctx) {
int number_of_frames, number_of_keyframes, encode_frame_count;
int i;
uint32_t bytes_total = 0;
SvcInternal *const si = get_svc_internal(svc_ctx);
if (svc_ctx == NULL || si == NULL) return NULL;
svc_log_reset(svc_ctx);
encode_frame_count = si->encode_frame_count;
if (si->encode_frame_count <= 0) return vpx_svc_get_message(svc_ctx);
svc_log(svc_ctx, SVC_LOG_INFO, "\n");
number_of_keyframes = encode_frame_count / si->kf_dist + 1;
for (i = 0; i < si->layers; ++i) {
number_of_frames = encode_frame_count;
if (svc_ctx->encoding_mode == ALT_INTER_LAYER_PREDICTION_IP &&
(i == 1 || i == 3)) {
number_of_frames -= number_of_keyframes;
}
svc_log(svc_ctx, SVC_LOG_INFO, "Layer %d PSNR=[%2.3f], Bytes=[%u]\n", i,
(double)si->psnr_in_layer[i] / number_of_frames,
si->bytes_in_layer[i]);
bytes_total += si->bytes_in_layer[i];
si->psnr_in_layer[i] = 0;
si->bytes_in_layer[i] = 0;
}
// only display statistics once
si->encode_frame_count = 0;
svc_log(svc_ctx, SVC_LOG_INFO, "Total Bytes=[%u]\n", bytes_total);
return vpx_svc_get_message(svc_ctx);
}
void vpx_svc_release(SvcContext *svc_ctx) {
SvcInternal *si;
if (svc_ctx == NULL) return;
// do not use get_svc_internal as it will unnecessarily allocate an
// SvcInternal if it was not already allocated
si = (SvcInternal *)svc_ctx->internal;
if (si != NULL) {
free(si->buffer);
free(si);
svc_ctx->internal = NULL;
}
}