blob: da11d506a76e99ff8f1446eba5eb75de45c98af7
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 | int 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 *s = ctx->priv; |
60 | |
61 | if (s->mode == MODE_RANDOM) { |
62 | uint32_t seed; |
63 | |
64 | if (s->random_seed == -1) |
65 | s->random_seed = av_get_random_seed(); |
66 | seed = s->random_seed; |
67 | av_log(ctx, AV_LOG_INFO, "random seed: 0x%08"PRIx32"\n", seed); |
68 | av_lfg_init(&s->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 *s = 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 (s->mode) { |
87 | case MODE_TOGGLE: out_perm = in_perm == RO ? RW : RO; break; |
88 | case MODE_RANDOM: out_perm = av_lfg_get(&s->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 */ |
179 |