This is in preparation for adding an audio split filter.
Showing the changes to libavfilter/split.c (1 of 2 files). Show all
Unified · Split
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| 1 | +/* | |
| 2 | + * Copyright (c) 2007 Bobby Bingham | |
| 3 | + * | |
| 4 | + * This file is part of Libav. | |
| 5 | + * | |
| 6 | + * Libav 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 | + * Libav 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 Libav; 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 | |
| 23 | + * Video splitter | |
| 24 | + */ | |
| 25 | + | |
| 26 | +#include "avfilter.h" | |
| 27 | + | |
| 28 | +static int split_init(AVFilterContext *ctx, const char *args, void *opaque) | |
| 29 | +{ | |
| 30 | + int i, nb_outputs = 2; | |
| 31 | + | |
| 32 | + if (args) { | |
| 33 | + nb_outputs = strtol(args, NULL, 0); | |
| 34 | + if (nb_outputs <= 0) { | |
| 35 | + av_log(ctx, AV_LOG_ERROR, "Invalid number of outputs specified: %d.\n", | |
| 36 | + nb_outputs); | |
| 37 | + return AVERROR(EINVAL); | |
| 38 | + } | |
| 39 | + } | |
| 40 | + | |
| 41 | + for (i = 0; i < nb_outputs; i++) { | |
| 42 | + char name[32]; | |
| 43 | + AVFilterPad pad = { 0 }; | |
| 44 | + | |
| 45 | + snprintf(name, sizeof(name), "output%d", i); | |
| 46 | + pad.type = AVMEDIA_TYPE_VIDEO; | |
| 47 | + pad.name = av_strdup(name); | |
| 48 | + | |
| 49 | + avfilter_insert_outpad(ctx, i, &pad); | |
| 50 | + } | |
| 51 | + | |
| 52 | + return 0; | |
| 53 | +} | |
| 54 | + | |
| 55 | +static void split_uninit(AVFilterContext *ctx) | |
| 56 | +{ | |
| 57 | + int i; | |
| 58 | + | |
| 59 | + for (i = 0; i < ctx->output_count; i++) | |
| 60 | + av_freep(&ctx->output_pads[i].name); | |
| 61 | +} | |
| 62 | + | |
| 63 | +static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref) | |
| 64 | +{ | |
| 65 | + AVFilterContext *ctx = inlink->dst; | |
| 66 | + int i; | |
| 67 | + | |
| 68 | + for (i = 0; i < ctx->output_count; i++) | |
| 69 | + avfilter_start_frame(ctx->outputs[i], | |
| 70 | + avfilter_ref_buffer(picref, ~AV_PERM_WRITE)); | |
| 71 | +} | |
| 72 | + | |
| 73 | +static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) | |
| 74 | +{ | |
| 75 | + AVFilterContext *ctx = inlink->dst; | |
| 76 | + int i; | |
| 77 | + | |
| 78 | + for (i = 0; i < ctx->output_count; i++) | |
| 79 | + avfilter_draw_slice(ctx->outputs[i], y, h, slice_dir); | |
| 80 | +} | |
| 81 | + | |
| 82 | +static void end_frame(AVFilterLink *inlink) | |
| 83 | +{ | |
| 84 | + AVFilterContext *ctx = inlink->dst; | |
| 85 | + int i; | |
| 86 | + | |
| 87 | + for (i = 0; i < ctx->output_count; i++) | |
| 88 | + avfilter_end_frame(ctx->outputs[i]); | |
| 89 | + | |
| 90 | + avfilter_unref_buffer(inlink->cur_buf); | |
| 91 | +} | |
| 92 | + | |
| 93 | +AVFilter avfilter_vf_split = { | |
| 94 | + .name = "split", | |
| 95 | + .description = NULL_IF_CONFIG_SMALL("Pass on the input to two outputs."), | |
| 96 | + | |
| 97 | + .init = split_init, | |
| 98 | + .uninit = split_uninit, | |
| 99 | + | |
| 100 | + .inputs = (AVFilterPad[]) {{ .name = "default", | |
| 101 | + .type = AVMEDIA_TYPE_VIDEO, | |
| 102 | + .get_video_buffer= avfilter_null_get_video_buffer, | |
| 103 | + .start_frame = start_frame, | |
| 104 | + .draw_slice = draw_slice, | |
| 105 | + .end_frame = end_frame, }, | |
| 106 | + { .name = NULL}}, | |
| 107 | + .outputs = (AVFilterPad[]) {{ .name = NULL}}, | |
| 108 | +}; | |