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 "aom_scale/yv12config.h"
19 #include "aom/aom_integer.h"
20 
21 #ifdef __cplusplus
22 extern "C" {
23 #endif
24 
26 #define MAX_LAG_BUFFERS 35
27 #define MAX_LAP_BUFFERS 35
28 #define MAX_TOTAL_BUFFERS (MAX_LAG_BUFFERS + MAX_LAP_BUFFERS)
29 #define LAP_LAG_IN_FRAMES 17
30 
31 struct lookahead_entry {
33  int64_t ts_start;
34  int64_t ts_end;
35  int display_idx;
37 };
38 
39 // The max of past frames we want to keep in the queue.
40 #define MAX_PRE_FRAMES 1
41 
42 enum { ENCODE_STAGE, LAP_STAGE, MAX_STAGES } UENUM1BYTE(COMPRESSOR_STAGE);
43 
44 struct read_ctx {
45  int sz; /* Number of buffers currently in the queue */
46  int read_idx; /* Read index */
47  int pop_sz; /* Size to check for pop condition */
48  int valid; /* Is this ctx valid? */
49 };
50 
51 struct lookahead_ctx {
52  int max_sz; /* Absolute size of the queue */
53  int write_idx; /* Write index */
54  struct read_ctx read_ctxs[MAX_STAGES]; /* Read context */
55  struct lookahead_entry *buf; /* Buffer list */
56  int push_frame_count; /* Number of frames has been pushed in the queue*/
57 };
65 struct lookahead_ctx *av1_lookahead_init(
66  unsigned int width, unsigned int height, unsigned int subsampling_x,
67  unsigned int subsampling_y, int use_highbitdepth, unsigned int depth,
68  const int border_in_pixels, int byte_alignment, int num_lap_buffers);
69 
72 void av1_lookahead_destroy(struct lookahead_ctx *ctx);
73 
89 int av1_lookahead_push(struct lookahead_ctx *ctx, const YV12_BUFFER_CONFIG *src,
90  int64_t ts_start, int64_t ts_end, int use_highbitdepth,
91  aom_enc_frame_flags_t flags);
92 
103 struct lookahead_entry *av1_lookahead_pop(struct lookahead_ctx *ctx, int drain,
104  COMPRESSOR_STAGE stage);
105 
114 struct lookahead_entry *av1_lookahead_peek(struct lookahead_ctx *ctx, int index,
115  COMPRESSOR_STAGE stage);
116 
119 unsigned int av1_lookahead_depth(struct lookahead_ctx *ctx,
120  COMPRESSOR_STAGE stage);
121 
124 int av1_lookahead_pop_sz(struct lookahead_ctx *ctx, COMPRESSOR_STAGE stage);
125 
126 #ifdef __cplusplus
127 } // extern "C"
128 #endif
129 
130 #endif // AOM_AV1_ENCODER_LOOKAHEAD_H_
long aom_enc_frame_flags_t
Encoded Frame Flags.
Definition: aom_encoder.h:357
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)
Initializes the lookahead stage.
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.
struct lookahead_entry * av1_lookahead_pop(struct lookahead_ctx *ctx, int drain, COMPRESSOR_STAGE stage)
Get the next source buffer to encode.
struct lookahead_entry * av1_lookahead_peek(struct lookahead_ctx *ctx, int index, COMPRESSOR_STAGE stage)
Get a future source buffer to encode.
void av1_lookahead_destroy(struct lookahead_ctx *ctx)
Destroys the lookahead stage.
YV12 frame buffer data structure.
Definition: yv12config.h:38