| 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 */ |