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 35
29 #define MAX_LAP_BUFFERS 35
30 #define MAX_TOTAL_BUFFERS (MAX_LAG_BUFFERS + MAX_LAP_BUFFERS)
31 #define LAP_LAG_IN_FRAMES 17
32 
33 struct lookahead_entry {
35  int64_t ts_start;
36  int64_t ts_end;
37  int display_idx;
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 };
69 struct lookahead_ctx *av1_lookahead_init(
70  unsigned int width, unsigned int height, unsigned int subsampling_x,
71  unsigned int subsampling_y, int use_highbitdepth, unsigned int depth,
72  const int border_in_pixels, int byte_alignment, int num_lap_buffers,
73  bool is_all_intra, int enable_global_motion);
74 
77 void av1_lookahead_destroy(struct lookahead_ctx *ctx);
78 
91 int av1_lookahead_push(struct lookahead_ctx *ctx, const YV12_BUFFER_CONFIG *src,
92  int64_t ts_start, int64_t ts_end, int use_highbitdepth,
93  aom_enc_frame_flags_t flags);
94 
105 struct lookahead_entry *av1_lookahead_pop(struct lookahead_ctx *ctx, int drain,
106  COMPRESSOR_STAGE stage);
107 
116 struct lookahead_entry *av1_lookahead_peek(struct lookahead_ctx *ctx, int index,
117  COMPRESSOR_STAGE stage);
118 
121 unsigned int av1_lookahead_depth(struct lookahead_ctx *ctx,
122  COMPRESSOR_STAGE stage);
123 
126 int av1_lookahead_pop_sz(struct lookahead_ctx *ctx, COMPRESSOR_STAGE stage);
127 
128 #ifdef __cplusplus
129 } // extern "C"
130 #endif
131 
132 #endif // AOM_AV1_ENCODER_LOOKAHEAD_H_
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)
Enqueue a source buffer.
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)
Initializes the lookahead stage.
struct lookahead_entry * av1_lookahead_peek(struct lookahead_ctx *ctx, int index, COMPRESSOR_STAGE stage)
Get a future source buffer to encode.
unsigned int av1_lookahead_depth(struct lookahead_ctx *ctx, COMPRESSOR_STAGE stage)
Get the number of frames currently in the lookahead queue.
int av1_lookahead_pop_sz(struct lookahead_ctx *ctx, COMPRESSOR_STAGE stage)
Get pop_sz value.
YV12 frame buffer data structure.
Definition: yv12config.h:38
struct lookahead_entry * av1_lookahead_pop(struct lookahead_ctx *ctx, int drain, COMPRESSOR_STAGE stage)
Get the next source buffer to encode.
void av1_lookahead_destroy(struct lookahead_ctx *ctx)
Destroys the lookahead stage.
long aom_enc_frame_flags_t
Encoded Frame Flags.
Definition: aom_encoder.h:357