ref: a6874985e2e7449a85cc0ad04930e41169e961e4
dir: /vp8/encoder/lookahead.h/
/*
* 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 VP8_ENCODER_LOOKAHEAD_H_
#define VP8_ENCODER_LOOKAHEAD_H_
#include "vpx_scale/yv12config.h"
#include "vpx/vpx_integer.h"
#ifdef __cplusplus
extern "C" {
#endif
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);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // VP8_ENCODER_LOOKAHEAD_H_