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