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  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 *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 avfilter_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 avfilter_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 */
  179.