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/* |
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* Copyright (c) 2013 Clément Bœsch |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/lfg.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/random_seed.h" |
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#include "audio.h" |
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#include "video.h" |
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enum mode { |
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MODE_NONE, |
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MODE_RO, |
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MODE_RW, |
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MODE_TOGGLE, |
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MODE_RANDOM, |
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NB_MODES |
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}; |
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typedef struct PermsContext { |
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const AVClass *class; |
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AVLFG lfg; |
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int64_t random_seed; |
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int mode; |
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} PermsContext; |
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#define OFFSET(x) offsetof(PermsContext, x) |
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM |
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static const AVOption options[] = { |
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{ "mode", "select permissions mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = MODE_NONE}, MODE_NONE, NB_MODES-1, FLAGS, "mode" }, |
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{ "none", "do nothing", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_NONE}, INT_MIN, INT_MAX, FLAGS, "mode" }, |
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{ "ro", "set all output frames read-only", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_RO}, INT_MIN, INT_MAX, FLAGS, "mode" }, |
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{ "rw", "set all output frames writable", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_RW}, INT_MIN, INT_MAX, FLAGS, "mode" }, |
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{ "toggle", "switch permissions", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_TOGGLE}, INT_MIN, INT_MAX, FLAGS, "mode" }, |
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{ "random", "set permissions randomly", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_RANDOM}, INT_MIN, INT_MAX, FLAGS, "mode" }, |
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{ "seed", "set the seed for the random mode", OFFSET(random_seed), AV_OPT_TYPE_INT64, {.i64 = -1}, -1, UINT32_MAX, FLAGS }, |
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{ NULL } |
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}; |
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static av_cold int init(AVFilterContext *ctx) |
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{ |
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PermsContext *s = ctx->priv; |
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✓✗ |
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if (s->mode == MODE_RANDOM) { |
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uint32_t seed; |
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✓✗ |
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if (s->random_seed == -1) |
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s->random_seed = av_get_random_seed(); |
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seed = s->random_seed; |
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av_log(ctx, AV_LOG_INFO, "random seed: 0x%08"PRIx32"\n", seed); |
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av_lfg_init(&s->lfg, seed); |
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} |
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return 0; |
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} |
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enum perm { RO, RW }; |
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static const char * const perm_str[2] = { "RO", "RW" }; |
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame) |
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{ |
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int ret; |
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AVFilterContext *ctx = inlink->dst; |
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PermsContext *s = ctx->priv; |
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AVFrame *out = frame; |
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enum perm in_perm = av_frame_is_writable(frame) ? RW : RO; |
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enum perm out_perm; |
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✗✓✗✗
✗ |
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switch (s->mode) { |
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case MODE_TOGGLE: out_perm = in_perm == RO ? RW : RO; break; |
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case MODE_RANDOM: out_perm = av_lfg_get(&s->lfg) & 1 ? RW : RO; break; |
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case MODE_RO: out_perm = RO; break; |
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case MODE_RW: out_perm = RW; break; |
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default: out_perm = in_perm; break; |
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} |
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✓✓ |
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av_log(ctx, AV_LOG_VERBOSE, "%s -> %s%s\n", |
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perm_str[in_perm], perm_str[out_perm], |
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in_perm == out_perm ? " (no-op)" : ""); |
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✓✓✓✓
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if (in_perm == RO && out_perm == RW) { |
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✗✓ |
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if ((ret = av_frame_make_writable(frame)) < 0) |
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return ret; |
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✓✓✓✓
|
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} else if (in_perm == RW && out_perm == RO) { |
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out = av_frame_clone(frame); |
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✗✓ |
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if (!out) |
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return AVERROR(ENOMEM); |
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} |
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ret = ff_filter_frame(ctx->outputs[0], out); |
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✓✓✓✓
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if (in_perm == RW && out_perm == RO) |
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av_frame_free(&frame); |
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return ret; |
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} |
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#if CONFIG_APERMS_FILTER |
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#define aperms_options options |
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AVFILTER_DEFINE_CLASS(aperms); |
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static const AVFilterPad aperms_inputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_AUDIO, |
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.filter_frame = filter_frame, |
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}, |
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{ NULL } |
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}; |
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static const AVFilterPad aperms_outputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_AUDIO, |
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}, |
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{ NULL } |
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}; |
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AVFilter ff_af_aperms = { |
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.name = "aperms", |
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.description = NULL_IF_CONFIG_SMALL("Set permissions for the output audio frame."), |
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.init = init, |
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.priv_size = sizeof(PermsContext), |
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.inputs = aperms_inputs, |
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.outputs = aperms_outputs, |
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.priv_class = &aperms_class, |
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}; |
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#endif /* CONFIG_APERMS_FILTER */ |
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#if CONFIG_PERMS_FILTER |
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#define perms_options options |
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AVFILTER_DEFINE_CLASS(perms); |
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static const AVFilterPad perms_inputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.filter_frame = filter_frame, |
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}, |
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{ NULL } |
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}; |
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static const AVFilterPad perms_outputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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}, |
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{ NULL } |
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}; |
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AVFilter ff_vf_perms = { |
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.name = "perms", |
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.description = NULL_IF_CONFIG_SMALL("Set permissions for the output video frame."), |
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.init = init, |
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.priv_size = sizeof(PermsContext), |
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.inputs = perms_inputs, |
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.outputs = perms_outputs, |
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.priv_class = &perms_class, |
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}; |
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#endif /* CONFIG_PERMS_FILTER */ |