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1 | /* |
2 | * Copyright (c) 2013 Clément Bœsch | |
3 | * | |
4 | * This file is part of FFmpeg. | |
5 | * | |
6 | * FFmpeg is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | * | |
11 | * FFmpeg is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with FFmpeg; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include "libavutil/lfg.h" | |
22 | #include "libavutil/opt.h" | |
23 | #include "libavutil/random_seed.h" | |
24 | #include "audio.h" | |
25 | #include "video.h" | |
26 | ||
27 | enum mode { | |
28 | MODE_NONE, | |
29 | MODE_RO, | |
30 | MODE_RW, | |
31 | MODE_TOGGLE, | |
32 | MODE_RANDOM, | |
33 | NB_MODES | |
34 | }; | |
35 | ||
36 | typedef struct { | |
37 | const AVClass *class; | |
38 | AVLFG lfg; | |
39 | int64_t random_seed; | |
40 | enum mode mode; | |
41 | } PermsContext; | |
42 | ||
43 | #define OFFSET(x) offsetof(PermsContext, x) | |
44 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM | |
45 | ||
46 | static const AVOption options[] = { | |
47 | { "mode", "select permissions mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = MODE_NONE}, MODE_NONE, NB_MODES-1, FLAGS, "mode" }, | |
48 | { "none", "do nothing", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_NONE}, INT_MIN, INT_MAX, FLAGS, "mode" }, | |
49 | { "ro", "set all output frames read-only", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_RO}, INT_MIN, INT_MAX, FLAGS, "mode" }, | |
50 | { "rw", "set all output frames writable", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_RW}, INT_MIN, INT_MAX, FLAGS, "mode" }, | |
51 | { "toggle", "switch permissions", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_TOGGLE}, INT_MIN, INT_MAX, FLAGS, "mode" }, | |
52 | { "random", "set permissions randomly", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_RANDOM}, INT_MIN, INT_MAX, FLAGS, "mode" }, | |
53 | { "seed", "set the seed for the random mode", OFFSET(random_seed), AV_OPT_TYPE_INT64, {.i64 = -1}, -1, UINT32_MAX, FLAGS }, | |
54 | { NULL } | |
55 | }; | |
56 | ||
57 | static av_cold int init(AVFilterContext *ctx) | |
58 | { | |
59 | PermsContext *perms = ctx->priv; | |
60 | ||
61 | if (perms->mode == MODE_RANDOM) { | |
62 | uint32_t seed; | |
63 | ||
64 | if (perms->random_seed == -1) | |
65 | perms->random_seed = av_get_random_seed(); | |
66 | seed = perms->random_seed; | |
67 | av_log(ctx, AV_LOG_INFO, "random seed: 0x%08x\n", seed); | |
68 | av_lfg_init(&perms->lfg, seed); | |
69 | } | |
70 | ||
71 | return 0; | |
72 | } | |
73 | ||
74 | enum perm { RO, RW }; | |
75 | static const char * const perm_str[2] = { "RO", "RW" }; | |
76 | ||
77 | static int filter_frame(AVFilterLink *inlink, AVFrame *frame) | |
78 | { | |
79 | int ret; | |
80 | AVFilterContext *ctx = inlink->dst; | |
81 | PermsContext *perms = ctx->priv; | |
82 | AVFrame *out = frame; | |
83 | enum perm in_perm = av_frame_is_writable(frame) ? RW : RO; | |
84 | enum perm out_perm; | |
85 | ||
86 | switch (perms->mode) { | |
87 | case MODE_TOGGLE: out_perm = in_perm == RO ? RW : RO; break; | |
88 | case MODE_RANDOM: out_perm = av_lfg_get(&perms->lfg) & 1 ? RW : RO; break; | |
89 | case MODE_RO: out_perm = RO; break; | |
90 | case MODE_RW: out_perm = RW; break; | |
91 | default: out_perm = in_perm; break; | |
92 | } | |
93 | ||
94 | av_log(ctx, AV_LOG_VERBOSE, "%s -> %s%s\n", | |
95 | perm_str[in_perm], perm_str[out_perm], | |
96 | in_perm == out_perm ? " (no-op)" : ""); | |
97 | ||
98 | if (in_perm == RO && out_perm == RW) { | |
99 | if ((ret = av_frame_make_writable(frame)) < 0) | |
100 | return ret; | |
101 | } else if (in_perm == RW && out_perm == RO) { | |
102 | out = av_frame_clone(frame); | |
103 | if (!out) | |
104 | return AVERROR(ENOMEM); | |
105 | } | |
106 | ||
107 | ret = ff_filter_frame(ctx->outputs[0], out); | |
108 | ||
109 | if (in_perm == RW && out_perm == RO) | |
110 | av_frame_free(&frame); | |
111 | return ret; | |
112 | } | |
113 | ||
114 | #if CONFIG_APERMS_FILTER | |
115 | ||
116 | #define aperms_options options | |
117 | AVFILTER_DEFINE_CLASS(aperms); | |
118 | ||
119 | static const AVFilterPad aperms_inputs[] = { | |
120 | { | |
121 | .name = "default", | |
122 | .type = AVMEDIA_TYPE_AUDIO, | |
123 | .filter_frame = filter_frame, | |
124 | }, | |
125 | { NULL } | |
126 | }; | |
127 | ||
128 | static const AVFilterPad aperms_outputs[] = { | |
129 | { | |
130 | .name = "default", | |
131 | .type = AVMEDIA_TYPE_AUDIO, | |
132 | }, | |
133 | { NULL } | |
134 | }; | |
135 | ||
136 | AVFilter ff_af_aperms = { | |
137 | .name = "aperms", | |
138 | .description = NULL_IF_CONFIG_SMALL("Set permissions for the output audio frame."), | |
139 | .init = init, | |
140 | .priv_size = sizeof(PermsContext), | |
141 | .inputs = aperms_inputs, | |
142 | .outputs = aperms_outputs, | |
143 | .priv_class = &aperms_class, | |
144 | }; | |
145 | #endif /* CONFIG_APERMS_FILTER */ | |
146 | ||
147 | #if CONFIG_PERMS_FILTER | |
148 | ||
149 | #define perms_options options | |
150 | AVFILTER_DEFINE_CLASS(perms); | |
151 | ||
152 | static const AVFilterPad perms_inputs[] = { | |
153 | { | |
154 | .name = "default", | |
155 | .type = AVMEDIA_TYPE_VIDEO, | |
156 | .filter_frame = filter_frame, | |
157 | }, | |
158 | { NULL } | |
159 | }; | |
160 | ||
161 | static const AVFilterPad perms_outputs[] = { | |
162 | { | |
163 | .name = "default", | |
164 | .type = AVMEDIA_TYPE_VIDEO, | |
165 | }, | |
166 | { NULL } | |
167 | }; | |
168 | ||
169 | AVFilter ff_vf_perms = { | |
170 | .name = "perms", | |
171 | .description = NULL_IF_CONFIG_SMALL("Set permissions for the output video frame."), | |
172 | .init = init, | |
173 | .priv_size = sizeof(PermsContext), | |
174 | .inputs = perms_inputs, | |
175 | .outputs = perms_outputs, | |
176 | .priv_class = &perms_class, | |
177 | }; | |
178 | #endif /* CONFIG_PERMS_FILTER */ |