lookahead.h

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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 AOM_AV1_ENCODER_LOOKAHEAD_H_
#define AOM_AV1_ENCODER_LOOKAHEAD_H_
 
#include <stdbool.h>
 
#include "aom_scale/yv12config.h"
#include "aom/aom_integer.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define MAX_LAG_BUFFERS 48
#define MAX_LAP_BUFFERS 48
#define MAX_TOTAL_BUFFERS (MAX_LAG_BUFFERS + MAX_LAP_BUFFERS)
#define LAP_LAG_IN_FRAMES 17
 
struct lookahead_entry {
  YV12_BUFFER_CONFIG img;
  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
 
enum { ENCODE_STAGE, LAP_STAGE, MAX_STAGES } UENUM1BYTE(COMPRESSOR_STAGE);
 
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*/
  uint8_t
      max_pre_frames; /* Maximum number of past frames allowed in the queue */
};
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, bool alloc_pyramid);
 
void av1_lookahead_destroy(struct lookahead_ctx *ctx);
 
int av1_lookahead_full(const struct lookahead_ctx *ctx);
 
int av1_lookahead_push(struct lookahead_ctx *ctx, const YV12_BUFFER_CONFIG *src,
                       int64_t ts_start, int64_t ts_end, int use_highbitdepth,
                       bool alloc_pyramid, aom_enc_frame_flags_t flags);
 
struct lookahead_entry *av1_lookahead_pop(struct lookahead_ctx *ctx, int drain,
                                          COMPRESSOR_STAGE stage);
 
struct lookahead_entry *av1_lookahead_peek(struct lookahead_ctx *ctx, int index,
                                           COMPRESSOR_STAGE stage);
 
unsigned int av1_lookahead_depth(struct lookahead_ctx *ctx,
                                 COMPRESSOR_STAGE stage);
 
int av1_lookahead_pop_sz(struct lookahead_ctx *ctx, COMPRESSOR_STAGE stage);
 
#ifdef __cplusplus
}  // extern "C"
#endif
 
#endif  // AOM_AV1_ENCODER_LOOKAHEAD_H_