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https://github.com/FFmpeg/FFmpeg.git
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b9c928a486
This flag allows distinguishing between filters that actually modify the data and those that only modify metadata or gather some stream information.
175 lines
5.6 KiB
C
175 lines
5.6 KiB
C
/*
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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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if (s->mode == MODE_RANDOM) {
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uint32_t seed;
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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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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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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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if (in_perm == RO && out_perm == RW) {
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if ((ret = av_frame_make_writable(frame)) < 0)
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return ret;
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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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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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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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AVFILTER_DEFINE_CLASS_EXT(perms, "(a)perms", options);
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#if CONFIG_APERMS_FILTER
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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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};
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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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};
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const 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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.priv_class = &perms_class,
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.init = init,
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.priv_size = sizeof(PermsContext),
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FILTER_INPUTS(aperms_inputs),
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FILTER_OUTPUTS(aperms_outputs),
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
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AVFILTER_FLAG_METADATA_ONLY,
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};
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#endif /* CONFIG_APERMS_FILTER */
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#if CONFIG_PERMS_FILTER
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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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};
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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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};
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const 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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FILTER_INPUTS(perms_inputs),
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FILTER_OUTPUTS(perms_outputs),
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.priv_class = &perms_class,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
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AVFILTER_FLAG_METADATA_ONLY,
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};
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#endif /* CONFIG_PERMS_FILTER */
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