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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.
* SvcContext - input parameters and state to encode a multi-layered
* spatial SVC frame
#include "vpx/vp8cx.h"
#include "vpx/vpx_encoder.h"
#ifdef __cplusplus
extern "C" {
typedef enum SVC_LOG_LEVEL {
typedef struct {
// public interface to svc_command options
int spatial_layers; // number of spatial layers
int temporal_layers; // number of temporal layers
int temporal_layering_mode;
SVC_LOG_LEVEL log_level; // amount of information to display
int output_rc_stat; // for outputting rc stats
int speed; // speed setting for codec
int threads;
int aqmode; // turns on aq-mode=3 (cyclic_refresh): 0=off, 1=on.
// private storage for vpx_svc_encode
void *internal;
} SvcContext;
#define COMPONENTS 4 // psnr & sse statistics maintained for total, y, u, v
typedef struct SvcInternal {
char options[OPTION_BUFFER_SIZE]; // set by vpx_svc_set_options
// values extracted from option, quantizers
vpx_svc_extra_cfg_t svc_params;
int enable_auto_alt_ref[VPX_SS_MAX_LAYERS];
int bitrates[VPX_MAX_LAYERS];
// accumulated statistics
double psnr_sum[VPX_SS_MAX_LAYERS][COMPONENTS]; // total/Y/U/V
uint64_t sse_sum[VPX_SS_MAX_LAYERS][COMPONENTS];
uint32_t bytes_sum[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 psnr_pkt_received;
int layer;
int use_multiple_frame_contexts;
vpx_codec_ctx_t *codec_ctx;
} SvcInternal_t;
* Set SVC options
* options are supplied as a single string separated by spaces
* Format: encoding-mode=<i|ip|alt-ip|gf>
* layers=<layer_count>
* scaling-factors=<n1>/<d1>,<n2>/<d2>,...
* quantizers=<q1>,<q2>,...
vpx_codec_err_t vpx_svc_set_options(SvcContext *svc_ctx, const char *options);
* initialize SVC encoding
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 *cfg);
* encode a frame of video with multiple 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);
* finished with svc encoding, release allocated resources
void vpx_svc_release(SvcContext *svc_ctx);
* dump accumulated statistics and reset accumulated values
void vpx_svc_dump_statistics(SvcContext *svc_ctx);
#ifdef __cplusplus
} // extern "C"