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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 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
* \brief Describes look ahead buffer operations.
#include <stdbool.h>
#include "aom_scale/yv12config.h"
#include "aom/aom_integer.h"
#ifdef __cplusplus
extern "C" {
/*!\cond */
#define MAX_LAG_BUFFERS 48
#define MAX_LAP_BUFFERS 48
#define LAP_LAG_IN_FRAMES 17
struct lookahead_entry {
int64_t ts_start;
int64_t ts_end;
int display_idx;
aom_enc_frame_flags_t flags;
// The max of past frames we want to keep in the queue.
#define MAX_PRE_FRAMES 1
struct read_ctx {
int sz; /* Number of buffers currently in the queue */
int read_idx; /* Read index */
int pop_sz; /* Size to check for pop condition */
int valid; /* Is this ctx valid? */
struct lookahead_ctx {
int max_sz; /* Absolute size of the queue */
int write_idx; /* Write index */
struct read_ctx read_ctxs[MAX_STAGES]; /* Read context */
struct lookahead_entry *buf; /* Buffer list */
int push_frame_count; /* Number of frames that have been pushed in the queue*/
max_pre_frames; /* Maximum number of past frames allowed in the queue */
/*!\endcond */
/**\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,
const int border_in_pixels, int byte_alignment, int num_lap_buffers,
bool is_all_intra, int enable_global_motion);
/**\brief Destroys the lookahead stage
void av1_lookahead_destroy(struct lookahead_ctx *ctx);
/**\brief Check if lookahead buffer is full
int av1_lookahead_full(const 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.
* \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] use_highbitdepth Tell if HBD is used
* \param[in] flags Flags set on this frame
int av1_lookahead_push(struct lookahead_ctx *ctx, const 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)
* \param[in] stage Encoder stage
* \retval Return NULL, if drain set and queue is empty, or 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
* \param[in] stage Encoder stage
* \retval Return 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
unsigned int av1_lookahead_depth(struct lookahead_ctx *ctx,
/**\brief Get pop_sz value
int av1_lookahead_pop_sz(struct lookahead_ctx *ctx, COMPRESSOR_STAGE stage);
#ifdef __cplusplus
} // extern "C"