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 #include <assert.h>
12 #include <stdlib.h>
13
14 #include "config/aom_config.h"
15
16 #include "aom_scale/yv12config.h"
17 #include "av1/common/common.h"
18 #include "av1/encoder/encoder.h"
19 #include "av1/encoder/extend.h"
20 #include "av1/encoder/lookahead.h"
21
22 /* Return the buffer at the given absolute index and increment the index */
pop(struct lookahead_ctx * ctx,int * idx)23 static struct lookahead_entry *pop(struct lookahead_ctx *ctx, int *idx) {
24 int index = *idx;
25 struct lookahead_entry *buf = ctx->buf + index;
26
27 assert(index < ctx->max_sz);
28 if (++index >= ctx->max_sz) index -= ctx->max_sz;
29 *idx = index;
30 return buf;
31 }
32
av1_lookahead_destroy(struct lookahead_ctx * ctx)33 void av1_lookahead_destroy(struct lookahead_ctx *ctx) {
34 if (ctx) {
35 if (ctx->buf) {
36 int i;
37
38 for (i = 0; i < ctx->max_sz; i++) aom_free_frame_buffer(&ctx->buf[i].img);
39 free(ctx->buf);
40 }
41 free(ctx);
42 }
43 }
44
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)45 struct lookahead_ctx *av1_lookahead_init(
46 unsigned int width, unsigned int height, unsigned int subsampling_x,
47 unsigned int subsampling_y, int use_highbitdepth, unsigned int depth,
48 const int border_in_pixels, int byte_alignment, int num_lap_buffers) {
49 struct lookahead_ctx *ctx = NULL;
50 int lag_in_frames = AOMMAX(1, depth);
51
52 // Add the lags to depth and clamp
53 depth += num_lap_buffers;
54 depth = clamp(depth, 1, MAX_TOTAL_BUFFERS);
55
56 // Allocate memory to keep previous source frames available.
57 depth += MAX_PRE_FRAMES;
58
59 // Allocate the lookahead structures
60 ctx = calloc(1, sizeof(*ctx));
61 if (ctx) {
62 unsigned int i;
63 ctx->max_sz = depth;
64 ctx->read_ctxs[ENCODE_STAGE].pop_sz = ctx->max_sz - MAX_PRE_FRAMES;
65 ctx->read_ctxs[ENCODE_STAGE].valid = 1;
66 if (num_lap_buffers) {
67 ctx->read_ctxs[LAP_STAGE].pop_sz = lag_in_frames;
68 ctx->read_ctxs[LAP_STAGE].valid = 1;
69 }
70 ctx->buf = calloc(depth, sizeof(*ctx->buf));
71 if (!ctx->buf) goto fail;
72 for (i = 0; i < depth; i++) {
73 aom_free_frame_buffer(&ctx->buf[i].img);
74 if (aom_realloc_frame_buffer(&ctx->buf[i].img, width, height,
75 subsampling_x, subsampling_y,
76 use_highbitdepth, border_in_pixels,
77 byte_alignment, NULL, NULL, NULL))
78 goto fail;
79 }
80 }
81 return ctx;
82 fail:
83 av1_lookahead_destroy(ctx);
84 return NULL;
85 }
86
av1_lookahead_push(struct lookahead_ctx * ctx,YV12_BUFFER_CONFIG * src,int64_t ts_start,int64_t ts_end,int use_highbitdepth,aom_enc_frame_flags_t flags)87 int av1_lookahead_push(struct lookahead_ctx *ctx, YV12_BUFFER_CONFIG *src,
88 int64_t ts_start, int64_t ts_end, int use_highbitdepth,
89 aom_enc_frame_flags_t flags) {
90 struct lookahead_entry *buf;
91 int width = src->y_crop_width;
92 int height = src->y_crop_height;
93 int uv_width = src->uv_crop_width;
94 int uv_height = src->uv_crop_height;
95 int subsampling_x = src->subsampling_x;
96 int subsampling_y = src->subsampling_y;
97 int larger_dimensions, new_dimensions;
98
99 assert(ctx->read_ctxs[ENCODE_STAGE].valid == 1);
100 if (ctx->read_ctxs[ENCODE_STAGE].sz + 1 + MAX_PRE_FRAMES > ctx->max_sz)
101 return 1;
102 ctx->read_ctxs[ENCODE_STAGE].sz++;
103 if (ctx->read_ctxs[LAP_STAGE].valid) {
104 ctx->read_ctxs[LAP_STAGE].sz++;
105 }
106 buf = pop(ctx, &ctx->write_idx);
107
108 new_dimensions = width != buf->img.y_crop_width ||
109 height != buf->img.y_crop_height ||
110 uv_width != buf->img.uv_crop_width ||
111 uv_height != buf->img.uv_crop_height;
112 larger_dimensions = width > buf->img.y_width || height > buf->img.y_height ||
113 uv_width > buf->img.uv_width ||
114 uv_height > buf->img.uv_height;
115 assert(!larger_dimensions || new_dimensions);
116
117 if (larger_dimensions) {
118 YV12_BUFFER_CONFIG new_img;
119 memset(&new_img, 0, sizeof(new_img));
120 if (aom_alloc_frame_buffer(&new_img, width, height, subsampling_x,
121 subsampling_y, use_highbitdepth,
122 AOM_BORDER_IN_PIXELS, 0))
123 return 1;
124 aom_free_frame_buffer(&buf->img);
125 buf->img = new_img;
126 } else if (new_dimensions) {
127 buf->img.y_crop_width = src->y_crop_width;
128 buf->img.y_crop_height = src->y_crop_height;
129 buf->img.uv_crop_width = src->uv_crop_width;
130 buf->img.uv_crop_height = src->uv_crop_height;
131 buf->img.subsampling_x = src->subsampling_x;
132 buf->img.subsampling_y = src->subsampling_y;
133 }
134 // Partial copy not implemented yet
135 av1_copy_and_extend_frame(src, &buf->img);
136
137 buf->ts_start = ts_start;
138 buf->ts_end = ts_end;
139 buf->flags = flags;
140 aom_remove_metadata_from_frame_buffer(&buf->img);
141 aom_copy_metadata_to_frame_buffer(&buf->img, src->metadata);
142 return 0;
143 }
144
av1_lookahead_pop(struct lookahead_ctx * ctx,int drain,COMPRESSOR_STAGE stage)145 struct lookahead_entry *av1_lookahead_pop(struct lookahead_ctx *ctx, int drain,
146 COMPRESSOR_STAGE stage) {
147 struct lookahead_entry *buf = NULL;
148 if (ctx) {
149 struct read_ctx *read_ctx = &ctx->read_ctxs[stage];
150 assert(read_ctx->valid == 1);
151 if (read_ctx->sz && (drain || read_ctx->sz == read_ctx->pop_sz)) {
152 buf = pop(ctx, &read_ctx->read_idx);
153 read_ctx->sz--;
154 }
155 }
156 return buf;
157 }
158
av1_lookahead_peek(struct lookahead_ctx * ctx,int index,COMPRESSOR_STAGE stage)159 struct lookahead_entry *av1_lookahead_peek(struct lookahead_ctx *ctx, int index,
160 COMPRESSOR_STAGE stage) {
161 struct lookahead_entry *buf = NULL;
162 struct read_ctx *read_ctx = NULL;
163 if (ctx == NULL) {
164 return buf;
165 }
166
167 read_ctx = &ctx->read_ctxs[stage];
168 assert(read_ctx->valid == 1);
169 if (index >= 0) {
170 // Forward peek
171 if (index < read_ctx->sz) {
172 index += read_ctx->read_idx;
173 if (index >= ctx->max_sz) index -= ctx->max_sz;
174 buf = ctx->buf + index;
175 }
176 } else if (index < 0) {
177 // Backward peek
178 if (-index <= MAX_PRE_FRAMES) {
179 index += (int)(read_ctx->read_idx);
180 if (index < 0) index += (int)(ctx->max_sz);
181 buf = ctx->buf + index;
182 }
183 }
184
185 return buf;
186 }
187
av1_lookahead_depth(struct lookahead_ctx * ctx,COMPRESSOR_STAGE stage)188 unsigned int av1_lookahead_depth(struct lookahead_ctx *ctx,
189 COMPRESSOR_STAGE stage) {
190 struct read_ctx *read_ctx = NULL;
191 assert(ctx != NULL);
192
193 read_ctx = &ctx->read_ctxs[stage];
194 assert(read_ctx->valid == 1);
195 return read_ctx->sz;
196 }
197
av1_lookahead_pop_sz(struct lookahead_ctx * ctx,COMPRESSOR_STAGE stage)198 int av1_lookahead_pop_sz(struct lookahead_ctx *ctx, COMPRESSOR_STAGE stage) {
199 struct read_ctx *read_ctx = NULL;
200 assert(ctx != NULL);
201
202 read_ctx = &ctx->read_ctxs[stage];
203 assert(read_ctx->valid == 1);
204 return read_ctx->pop_sz;
205 }
206