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+/*
+ * Copyright (c) 2011 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.
+ */
+
+#ifndef VP9_ENCODER_VP9_LOOKAHEAD_H_
+#define VP9_ENCODER_VP9_LOOKAHEAD_H_
+
+#include "vpx_scale/yv12config.h"
+#include "vpx/vpx_integer.h"
+
+#if CONFIG_SPATIAL_SVC
+#include "vpx/vp8cx.h"
+#include "vpx/vpx_encoder.h"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define MAX_LAG_BUFFERS 25
+
+struct lookahead_entry {
+ YV12_BUFFER_CONFIG img;
+ int64_t ts_start;
+ int64_t ts_end;
+ unsigned int flags;
+};
+
+// The max of past frames we want to keep in the queue.
+#define MAX_PRE_FRAMES 1
+
+struct lookahead_ctx {
+ unsigned int max_sz; /* Absolute size of the queue */
+ unsigned int sz; /* Number of buffers currently in the queue */
+ unsigned int read_idx; /* Read index */
+ unsigned int write_idx; /* Write index */
+ struct lookahead_entry *buf; /* Buffer list */
+};
+
+/**\brief Initializes the lookahead stage
+ *
+ * The lookahead stage is a queue of frame buffers on which some analysis
+ * may be done when buffers are enqueued.
+ */
+struct lookahead_ctx *vp9_lookahead_init(unsigned int width,
+ unsigned int height,
+ unsigned int subsampling_x,
+ unsigned int subsampling_y,
+#if CONFIG_VP9_HIGHBITDEPTH
+ int use_highbitdepth,
+#endif
+ unsigned int depth);
+
+
+/**\brief Destroys the lookahead stage
+ */
+void vp9_lookahead_destroy(struct lookahead_ctx *ctx);
+
+
+/**\brief Enqueue a source buffer
+ *
+ * This function will copy the source image into a new framebuffer with
+ * the expected stride/border.
+ *
+ * If active_map is non-NULL and there is only one frame in the queue, then copy
+ * only active macroblocks.
+ *
+ * \param[in] ctx Pointer to the lookahead context
+ * \param[in] src Pointer to the image to enqueue
+ * \param[in] ts_start Timestamp for the start of this frame
+ * \param[in] ts_end Timestamp for the end of this frame
+ * \param[in] flags Flags set on this frame
+ * \param[in] active_map Map that specifies which macroblock is active
+ */
+int vp9_lookahead_push(struct lookahead_ctx *ctx, YV12_BUFFER_CONFIG *src,
+ int64_t ts_start, int64_t ts_end,
+#if CONFIG_VP9_HIGHBITDEPTH
+ int use_highbitdepth,
+#endif
+ unsigned int flags);
+
+
+/**\brief Get the next source buffer to encode
+ *
+ *
+ * \param[in] ctx Pointer to the lookahead context
+ * \param[in] drain Flag indicating the buffer should be drained
+ * (return a buffer regardless of the current queue depth)
+ *
+ * \retval NULL, if drain set and queue is empty
+ * \retval NULL, if drain not set and queue not of the configured depth
+ */
+struct lookahead_entry *vp9_lookahead_pop(struct lookahead_ctx *ctx,
+ int drain);
+
+
+/**\brief Get a future source buffer to encode
+ *
+ * \param[in] ctx Pointer to the lookahead context
+ * \param[in] index Index of the frame to be returned, 0 == next frame
+ *
+ * \retval NULL, if no buffer exists at the specified index
+ */
+struct lookahead_entry *vp9_lookahead_peek(struct lookahead_ctx *ctx,
+ int index);
+
+
+/**\brief Get the number of frames currently in the lookahead queue
+ *
+ * \param[in] ctx Pointer to the lookahead context
+ */
+unsigned int vp9_lookahead_depth(struct lookahead_ctx *ctx);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // VP9_ENCODER_VP9_LOOKAHEAD_H_