| AOMedia AV1 Codec

lookahead.h
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1/*
2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved.
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11
15#ifndef AOM_AV1_ENCODER_LOOKAHEAD_H_
16#define AOM_AV1_ENCODER_LOOKAHEAD_H_
17
18#include <stdbool.h>
19
20#include "aom_scale/yv12config.h"
21#include "aom/aom_integer.h"
22
23#ifdef __cplusplus
24 extern "C" {
25#endif
26
28#define MAX_LAG_BUFFERS 48
29#define MAX_LAP_BUFFERS 48
30#define MAX_TOTAL_BUFFERS (MAX_LAG_BUFFERS + MAX_LAP_BUFFERS)
31#define LAP_LAG_IN_FRAMES 17
32
33 struct lookahead_entry {
34 YV12_BUFFER_CONFIG img;
35 int64_t ts_start;
36 int64_t ts_end;
37 int display_idx;
38 aom_enc_frame_flags_t flags;
39};
40
41// The max of past frames we want to keep in the queue.
42#define MAX_PRE_FRAMES 1
43
44 enum { ENCODE_STAGE, LAP_STAGE, MAX_STAGES } UENUM1BYTE(COMPRESSOR_STAGE);
45
46 struct read_ctx {
47 int sz; /* Number of buffers currently in the queue */
48 int read_idx; /* Read index */
49 int pop_sz; /* Size to check for pop condition */
50 int valid; /* Is this ctx valid? */
51};
52
53 struct lookahead_ctx {
54 int max_sz; /* Absolute size of the queue */
55 int write_idx; /* Write index */
56 struct read_ctx read_ctxs[MAX_STAGES]; /* Read context */
57 struct lookahead_entry *buf; /* Buffer list */
58 int push_frame_count; /* Number of frames that have been pushed in the queue*/
59 uint8_t
60 max_pre_frames; /* Maximum number of past frames allowed in the queue */
61};
63
69 struct lookahead_ctx *av1_lookahead_init(
70 int width, int height, int subsampling_x, int subsampling_y,
71 int use_highbitdepth, int depth, int border_in_pixels, int byte_alignment,
72 int num_lap_buffers, bool is_all_intra, bool alloc_pyramid);
73
76 void av1_lookahead_destroy(struct lookahead_ctx *ctx);
77
80 int av1_lookahead_full(const struct lookahead_ctx *ctx);
81
96 int av1_lookahead_push(struct lookahead_ctx *ctx, const YV12_BUFFER_CONFIG *src,
97 int64_t ts_start, int64_t ts_end, int use_highbitdepth,
98 bool alloc_pyramid, aom_enc_frame_flags_t flags);
99
110 struct lookahead_entry *av1_lookahead_pop(struct lookahead_ctx *ctx, int drain,
111 COMPRESSOR_STAGE stage);
112
121 struct lookahead_entry *av1_lookahead_peek(struct lookahead_ctx *ctx, int index,
122 COMPRESSOR_STAGE stage);
123
126 int av1_lookahead_depth(struct lookahead_ctx *ctx, COMPRESSOR_STAGE stage);
127
130 int av1_lookahead_pop_sz(struct lookahead_ctx *ctx, COMPRESSOR_STAGE stage);
131
132#ifdef __cplusplus
133} // extern "C"
134#endif
135
136#endif // AOM_AV1_ENCODER_LOOKAHEAD_H_
aom_enc_frame_flags_t
long aom_enc_frame_flags_t
Encoded Frame Flags.
Definition aom_encoder.h:377
av1_lookahead_pop
struct lookahead_entry * av1_lookahead_pop(struct lookahead_ctx *ctx, int drain, COMPRESSOR_STAGE stage)
Get the next source buffer to encode.
av1_lookahead_peek
struct lookahead_entry * av1_lookahead_peek(struct lookahead_ctx *ctx, int index, COMPRESSOR_STAGE stage)
Get a future source buffer to encode.
av1_lookahead_full
int av1_lookahead_full(const struct lookahead_ctx *ctx)
Check if lookahead buffer is full.
av1_lookahead_pop_sz
int av1_lookahead_pop_sz(struct lookahead_ctx *ctx, COMPRESSOR_STAGE stage)
Get pop_sz value.
av1_lookahead_depth
int av1_lookahead_depth(struct lookahead_ctx *ctx, COMPRESSOR_STAGE stage)
Get the number of frames currently in the lookahead queue.
av1_lookahead_push
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)
Enqueue a source buffer.
av1_lookahead_init
struct lookahead_ctx * av1_lookahead_init(int width, int height, int subsampling_x, int subsampling_y, int use_highbitdepth, int depth, int border_in_pixels, int byte_alignment, int num_lap_buffers, bool is_all_intra, bool alloc_pyramid)
Initializes the lookahead stage.
av1_lookahead_destroy
void av1_lookahead_destroy(struct lookahead_ctx *ctx)
Destroys the lookahead stage.