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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 LOOKAHEAD_H
#define LOOKAHEAD_H
#include "vpx_scale/yv12config.h"
#include "vpx/vpx_integer.h"
struct lookahead_entry
{
YV12_BUFFER_CONFIG img;
int64_t ts_start;
int64_t ts_end;
unsigned int flags;
};
struct lookahead_ctx;
/**\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* vp8_lookahead_init(unsigned int width,
unsigned int height,
unsigned int depth
);
/**\brief Destroys the lookahead stage
*
*/
void vp8_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
vp8_lookahead_push(struct lookahead_ctx *ctx,
YV12_BUFFER_CONFIG *src,
int64_t ts_start,
int64_t ts_end,
unsigned int flags,
unsigned char *active_map);
/**\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*
vp8_lookahead_pop(struct lookahead_ctx *ctx,
int drain);
#define PEEK_FORWARD 1
#define PEEK_BACKWARD -1
/**\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*
vp8_lookahead_peek(struct lookahead_ctx *ctx,
unsigned int index,
int direction);
/**\brief Get the number of frames currently in the lookahead queue
*
* \param[in] ctx Pointer to the lookahead context
*/
unsigned int
vp8_lookahead_depth(struct lookahead_ctx *ctx);
#endif
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