| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2012 Stefano Sabatini | ||
| 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 | /** | ||
| 22 | * @file framestep filter, inspired on libmpcodecs/vf_framestep.c by | ||
| 23 | * Daniele Fornighieri <guru AT digitalfantasy it>. | ||
| 24 | */ | ||
| 25 | |||
| 26 | #include "libavutil/opt.h" | ||
| 27 | #include "avfilter.h" | ||
| 28 | #include "internal.h" | ||
| 29 | #include "video.h" | ||
| 30 | |||
| 31 | typedef struct NullContext { | ||
| 32 | const AVClass *class; | ||
| 33 | int frame_step; | ||
| 34 | } FrameStepContext; | ||
| 35 | |||
| 36 | #define OFFSET(x) offsetof(FrameStepContext, x) | ||
| 37 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM | ||
| 38 | |||
| 39 | static const AVOption framestep_options[] = { | ||
| 40 | { "step", "set frame step", OFFSET(frame_step), AV_OPT_TYPE_INT, {.i64=1}, 1, INT_MAX, FLAGS}, | ||
| 41 | { NULL }, | ||
| 42 | }; | ||
| 43 | |||
| 44 | AVFILTER_DEFINE_CLASS(framestep); | ||
| 45 | |||
| 46 | ✗ | static int config_output_props(AVFilterLink *outlink) | |
| 47 | { | ||
| 48 | ✗ | AVFilterContext *ctx = outlink->src; | |
| 49 | ✗ | FrameStepContext *framestep = ctx->priv; | |
| 50 | ✗ | AVFilterLink *inlink = ctx->inputs[0]; | |
| 51 | |||
| 52 | outlink->frame_rate = | ||
| 53 | ✗ | av_div_q(inlink->frame_rate, (AVRational){framestep->frame_step, 1}); | |
| 54 | |||
| 55 | ✗ | av_log(ctx, AV_LOG_VERBOSE, "step:%d frame_rate:%d/%d(%f) -> frame_rate:%d/%d(%f)\n", | |
| 56 | framestep->frame_step, | ||
| 57 | inlink->frame_rate.num, inlink->frame_rate.den, av_q2d(inlink->frame_rate), | ||
| 58 | outlink->frame_rate.num, outlink->frame_rate.den, av_q2d(outlink->frame_rate)); | ||
| 59 | ✗ | return 0; | |
| 60 | } | ||
| 61 | |||
| 62 | ✗ | static int filter_frame(AVFilterLink *inlink, AVFrame *ref) | |
| 63 | { | ||
| 64 | ✗ | FrameStepContext *framestep = inlink->dst->priv; | |
| 65 | |||
| 66 | ✗ | if (!(inlink->frame_count_out % framestep->frame_step)) { | |
| 67 | ✗ | return ff_filter_frame(inlink->dst->outputs[0], ref); | |
| 68 | } else { | ||
| 69 | ✗ | av_frame_free(&ref); | |
| 70 | ✗ | return 0; | |
| 71 | } | ||
| 72 | } | ||
| 73 | |||
| 74 | static const AVFilterPad framestep_inputs[] = { | ||
| 75 | { | ||
| 76 | .name = "default", | ||
| 77 | .type = AVMEDIA_TYPE_VIDEO, | ||
| 78 | .filter_frame = filter_frame, | ||
| 79 | }, | ||
| 80 | }; | ||
| 81 | |||
| 82 | static const AVFilterPad framestep_outputs[] = { | ||
| 83 | { | ||
| 84 | .name = "default", | ||
| 85 | .type = AVMEDIA_TYPE_VIDEO, | ||
| 86 | .config_props = config_output_props, | ||
| 87 | }, | ||
| 88 | }; | ||
| 89 | |||
| 90 | const AVFilter ff_vf_framestep = { | ||
| 91 | .name = "framestep", | ||
| 92 | .description = NULL_IF_CONFIG_SMALL("Select one frame every N frames."), | ||
| 93 | .priv_size = sizeof(FrameStepContext), | ||
| 94 | .priv_class = &framestep_class, | ||
| 95 | FILTER_INPUTS(framestep_inputs), | ||
| 96 | FILTER_OUTPUTS(framestep_outputs), | ||
| 97 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_METADATA_ONLY, | ||
| 98 | }; | ||
| 99 |