| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * CEA-708 Closed Caption Repacker | ||
| 3 | * Copyright (c) 2023 LTN Global Communications | ||
| 4 | * | ||
| 5 | * Author: Devin Heitmueller <dheitmueller@ltnglobal.com> | ||
| 6 | * | ||
| 7 | * This file is part of FFmpeg. | ||
| 8 | * | ||
| 9 | * FFmpeg is free software; you can redistribute it and/or | ||
| 10 | * modify it under the terms of the GNU Lesser General Public | ||
| 11 | * License as published by the Free Software Foundation; either | ||
| 12 | * version 2.1 of the License, or (at your option) any later version. | ||
| 13 | * | ||
| 14 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 17 | * Lesser General Public License for more details. | ||
| 18 | * | ||
| 19 | * You should have received a copy of the GNU Lesser General Public | ||
| 20 | * License along with FFmpeg; if not, write to the Free Software | ||
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 22 | */ | ||
| 23 | |||
| 24 | /* | ||
| 25 | * Repackage CEA-708 arrays, which deals with incorrect cc_count for a given | ||
| 26 | * output framerate, and incorrect 708 padding. | ||
| 27 | * | ||
| 28 | * See CEA CEA-10-A "EIA-708-B Implementation Guidance", Section 26.5 | ||
| 29 | * "Grouping DTVCC Data Within user_data() Structure" | ||
| 30 | */ | ||
| 31 | |||
| 32 | #include "avfilter.h" | ||
| 33 | #include "filters.h" | ||
| 34 | #include "ccfifo.h" | ||
| 35 | #include "video.h" | ||
| 36 | #include "libavutil/opt.h" | ||
| 37 | |||
| 38 | typedef struct CCRepackContext | ||
| 39 | { | ||
| 40 | const AVClass *class; | ||
| 41 | CCFifo cc_fifo; | ||
| 42 | } CCRepackContext; | ||
| 43 | |||
| 44 | static const AVOption ccrepack_options[] = { | ||
| 45 | { NULL } | ||
| 46 | }; | ||
| 47 | |||
| 48 | AVFILTER_DEFINE_CLASS(ccrepack); | ||
| 49 | |||
| 50 | ✗ | static int config_input(AVFilterLink *link) | |
| 51 | { | ||
| 52 | ✗ | FilterLink *l = ff_filter_link(link); | |
| 53 | ✗ | CCRepackContext *ctx = link->dst->priv; | |
| 54 | |||
| 55 | ✗ | int ret = ff_ccfifo_init(&ctx->cc_fifo, l->frame_rate, ctx); | |
| 56 | ✗ | if (ret < 0) { | |
| 57 | ✗ | av_log(ctx, AV_LOG_ERROR, "Failure to setup CC FIFO queue\n"); | |
| 58 | ✗ | return ret; | |
| 59 | } | ||
| 60 | |||
| 61 | ✗ | return 0; | |
| 62 | } | ||
| 63 | |||
| 64 | ✗ | static int filter_frame(AVFilterLink *inlink, AVFrame *frame) | |
| 65 | { | ||
| 66 | ✗ | CCRepackContext *ctx = inlink->dst->priv; | |
| 67 | ✗ | AVFilterLink *outlink = inlink->dst->outputs[0]; | |
| 68 | |||
| 69 | ✗ | ff_ccfifo_extract(&ctx->cc_fifo, frame); | |
| 70 | ✗ | ff_ccfifo_inject(&ctx->cc_fifo, frame); | |
| 71 | |||
| 72 | ✗ | return ff_filter_frame(outlink, frame); | |
| 73 | } | ||
| 74 | |||
| 75 | ✗ | static av_cold void uninit(AVFilterContext *ctx) | |
| 76 | { | ||
| 77 | ✗ | CCRepackContext *s = ctx->priv; | |
| 78 | ✗ | ff_ccfifo_uninit(&s->cc_fifo); | |
| 79 | ✗ | } | |
| 80 | |||
| 81 | static const AVFilterPad avfilter_vf_ccrepack_inputs[] = { | ||
| 82 | { | ||
| 83 | .name = "default", | ||
| 84 | .type = AVMEDIA_TYPE_VIDEO, | ||
| 85 | .filter_frame = filter_frame, | ||
| 86 | .config_props = config_input, | ||
| 87 | }, | ||
| 88 | }; | ||
| 89 | |||
| 90 | const AVFilter ff_vf_ccrepack = { | ||
| 91 | .name = "ccrepack", | ||
| 92 | .description = NULL_IF_CONFIG_SMALL("Repack CEA-708 closed caption metadata"), | ||
| 93 | .uninit = uninit, | ||
| 94 | .priv_size = sizeof(CCRepackContext), | ||
| 95 | .priv_class = &ccrepack_class, | ||
| 96 | FILTER_INPUTS(avfilter_vf_ccrepack_inputs), | ||
| 97 | FILTER_OUTPUTS(ff_video_default_filterpad), | ||
| 98 | }; | ||
| 99 |