diff options
Diffstat (limited to 'libavfilter/f_perms.c')
| -rw-r--r-- | libavfilter/f_perms.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/libavfilter/f_perms.c b/libavfilter/f_perms.c new file mode 100644 index 0000000000..40b8811149 --- /dev/null +++ b/libavfilter/f_perms.c @@ -0,0 +1,178 @@ +/* + * 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 "libavutil/lfg.h" +#include "libavutil/opt.h" +#include "libavutil/random_seed.h" +#include "audio.h" +#include "video.h" + +enum mode { + MODE_NONE, + MODE_RO, + MODE_RW, + MODE_TOGGLE, + MODE_RANDOM, + NB_MODES +}; + +typedef struct { + 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 + +static const AVOption options[] = { + { "mode", "select permissions mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = MODE_NONE}, MODE_NONE, NB_MODES-1, FLAGS, "mode" }, + { "none", "do nothing", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_NONE}, INT_MIN, INT_MAX, FLAGS, "mode" }, + { "ro", "set all output frames read-only", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_RO}, INT_MIN, INT_MAX, FLAGS, "mode" }, + { "rw", "set all output frames writable", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_RW}, INT_MIN, INT_MAX, FLAGS, "mode" }, + { "toggle", "switch permissions", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_TOGGLE}, INT_MIN, INT_MAX, FLAGS, "mode" }, + { "random", "set permissions randomly", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_RANDOM}, INT_MIN, INT_MAX, FLAGS, "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; + + if (s->mode == MODE_RANDOM) { + 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%08x\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 = av_frame_make_writable(frame)) < 0) + return ret; + } 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; +} + +#if CONFIG_APERMS_FILTER + +#define aperms_options options +AVFILTER_DEFINE_CLASS(aperms); + +static const AVFilterPad aperms_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .filter_frame = filter_frame, + }, + { NULL } +}; + +static const AVFilterPad aperms_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + }, + { NULL } +}; + +AVFilter ff_af_aperms = { + .name = "aperms", + .description = NULL_IF_CONFIG_SMALL("Set permissions for the output audio frame."), + .init = init, + .priv_size = sizeof(PermsContext), + .inputs = aperms_inputs, + .outputs = aperms_outputs, + .priv_class = &aperms_class, +}; +#endif /* CONFIG_APERMS_FILTER */ + +#if CONFIG_PERMS_FILTER + +#define perms_options options +AVFILTER_DEFINE_CLASS(perms); + +static const AVFilterPad perms_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .filter_frame = filter_frame, + }, + { NULL } +}; + +static const AVFilterPad perms_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + }, + { NULL } +}; + +AVFilter ff_vf_perms = { + .name = "perms", + .description = NULL_IF_CONFIG_SMALL("Set permissions for the output video frame."), + .init = init, + .priv_size = sizeof(PermsContext), + .inputs = perms_inputs, + .outputs = perms_outputs, + .priv_class = &perms_class, +}; +#endif /* CONFIG_PERMS_FILTER */ |