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 | }; | ||