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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
+ */
+
+#ifndef VPX_SVC_CONTEXT_H_
+#define VPX_SVC_CONTEXT_H_
+
+#include "./vp8cx.h"
+#include "./vpx_encoder.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum SVC_LOG_LEVEL {
+ SVC_LOG_ERROR,
+ SVC_LOG_INFO,
+ SVC_LOG_DEBUG
+} 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 log_print; // when set, printf log messages instead of returning the
+ // message with svc_get_message
+ int output_rc_stat; // for outputting rc stats
+ int speed; // speed setting for codec
+ int threads;
+ // private storage for vpx_svc_encode
+ void *internal;
+} SvcContext;
+
+#define OPTION_BUFFER_SIZE 1024
+#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_SS_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;
+
+ char message_buffer[2048];
+ 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
+ */
+const char *vpx_svc_dump_statistics(SvcContext *svc_ctx);
+
+/**
+ * get status message from previous encode
+ */
+const char *vpx_svc_get_message(const SvcContext *svc_ctx);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // VPX_SVC_CONTEXT_H_