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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 2012 Stefano Sabatini |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | /** |
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| 22 | * @file framestep filter, inspired on libmpcodecs/vf_framestep.c by |
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| 23 | * Daniele Fornighieri |
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| 24 | */ |
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| 25 | |||
| 26 | #include "libavutil/opt.h" |
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| 27 | #include "avfilter.h" |
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| 28 | #include "internal.h" |
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| 29 | #include "video.h" |
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| 30 | |||
| 31 | typedef struct { |
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| 32 | const AVClass *class; |
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| 33 | int frame_step; |
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| 34 | } FrameStepContext; |
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| 35 | |||
| 36 | #define OFFSET(x) offsetof(FrameStepContext, x) |
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| 37 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
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| 38 | |||
| 39 | static const AVOption framestep_options[] = { |
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| 40 | { "step", "set frame step", OFFSET(frame_step), AV_OPT_TYPE_INT, {.i64=1}, 1, INT_MAX, FLAGS}, |
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| 41 | { NULL }, |
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| 42 | }; |
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| 43 | |||
| 44 | AVFILTER_DEFINE_CLASS(framestep); |
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| 45 | |||
| 46 | static int config_output_props(AVFilterLink *outlink) |
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| 47 | { |
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| 48 | AVFilterContext *ctx = outlink->src; |
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| 49 | FrameStepContext *framestep = ctx->priv; |
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| 50 | AVFilterLink *inlink = ctx->inputs[0]; |
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| 51 | |||
| 52 | outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; |
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| 53 | outlink->frame_rate = |
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| 54 | av_div_q(inlink->frame_rate, (AVRational){framestep->frame_step, 1}); |
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| 55 | |||
| 56 | av_log(ctx, AV_LOG_VERBOSE, "step:%d frame_rate:%d/%d(%f) -> frame_rate:%d/%d(%f)\n", |
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| 57 | framestep->frame_step, |
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| 58 | inlink->frame_rate.num, inlink->frame_rate.den, av_q2d(inlink->frame_rate), |
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| 59 | outlink->frame_rate.num, outlink->frame_rate.den, av_q2d(outlink->frame_rate)); |
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| 60 | return 0; |
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| 61 | } |
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| 62 | |||
| 63 | static int filter_frame(AVFilterLink *inlink, AVFrame *ref) |
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| 64 | { |
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| 65 | FrameStepContext *framestep = inlink->dst->priv; |
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| 66 | |||
| 67 | if (!(inlink->frame_count % framestep->frame_step)) { |
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| 68 | return ff_filter_frame(inlink->dst->outputs[0], ref); |
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| 69 | } else { |
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| 70 | av_frame_free(&ref); |
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| 71 | return 0; |
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| 72 | } |
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| 73 | } |
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| 74 | |||
| 75 | static const AVFilterPad framestep_inputs[] = { |
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| 76 | { |
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| 77 | .name = "default", |
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| 78 | .type = AVMEDIA_TYPE_VIDEO, |
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| 79 | .filter_frame = filter_frame, |
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| 80 | }, |
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| 81 | { NULL } |
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| 82 | }; |
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| 83 | |||
| 84 | static const AVFilterPad framestep_outputs[] = { |
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| 85 | { |
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| 86 | .name = "default", |
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| 87 | .type = AVMEDIA_TYPE_VIDEO, |
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| 88 | .config_props = config_output_props, |
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| 89 | }, |
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| 90 | { NULL } |
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| 91 | }; |
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| 92 | |||
| 93 | AVFilter avfilter_vf_framestep = { |
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| 94 | .name = "framestep", |
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| 95 | .description = NULL_IF_CONFIG_SMALL("Select one frame every N frames."), |
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| 96 | .priv_size = sizeof(FrameStepContext), |
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| 97 | .priv_class = &framestep_class, |
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| 98 | .inputs = framestep_inputs, |
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| 99 | .outputs = framestep_outputs, |
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| 100 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
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| 101 | }; |