GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/f_perms.c Lines: 26 32 81.2 %
Date: 2020-09-25 23:16:12 Branches: 19 27 70.4 %

Line Branch Exec Source
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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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    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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#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 */