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/*
* Copyright (c) 2016, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#ifndef AV1_ENCODER_LOOKAHEAD_H_
#define AV1_ENCODER_LOOKAHEAD_H_
#include "aom_scale/yv12config.h"
#include "aom/aom_integer.h"
#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;
aom_enc_frame_flags_t flags;
};
// The max of past frames we want to keep in the queue.
#define MAX_PRE_FRAMES 1
struct lookahead_ctx {
int max_sz; /* Absolute size of the queue */
int sz; /* Number of buffers currently in the queue */
int read_idx; /* Read index */
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 *av1_lookahead_init(
unsigned int width, unsigned int height, unsigned int subsampling_x,
unsigned int subsampling_y, int use_highbitdepth, unsigned int depth);
/**\brief Destroys the lookahead stage
*/
void av1_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 av1_lookahead_push(struct lookahead_ctx *ctx, YV12_BUFFER_CONFIG *src,
int64_t ts_start, int64_t ts_end, int use_highbitdepth,
aom_enc_frame_flags_t 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 *av1_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 *av1_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 av1_lookahead_depth(struct lookahead_ctx *ctx);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // AV1_ENCODER_LOOKAHEAD_H_
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