Originally committed as revision 21240 to svn://svn.ffmpeg.org/ffmpeg/trunk
Showing the changes to libavfilter/vsrc_nullsrc.c (1 of 5 files). Show all
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| 1 | +/* | |
| 2 | + * This file is part of FFmpeg. | |
| 3 | + * | |
| 4 | + * FFmpeg is free software; you can redistribute it and/or | |
| 5 | + * modify it under the terms of the GNU Lesser General Public | |
| 6 | + * License as published by the Free Software Foundation; either | |
| 7 | + * version 2.1 of the License, or (at your option) any later version. | |
| 8 | + * | |
| 9 | + * FFmpeg is distributed in the hope that it will be useful, | |
| 10 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 | + * Lesser General Public License for more details. | |
| 13 | + * | |
| 14 | + * You should have received a copy of the GNU Lesser General Public | |
| 15 | + * License along with FFmpeg; if not, write to the Free Software | |
| 16 | + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 17 | + */ | |
| 18 | + | |
| 19 | +/** | |
| 20 | + * @file libavfilter/vsrc_nullsrc.c | |
| 21 | + * null video source | |
| 22 | + */ | |
| 23 | + | |
| 24 | +#include "avfilter.h" | |
| 25 | + | |
| 26 | +typedef struct { | |
| 27 | + int w, h; | |
| 28 | +} NullContext; | |
| 29 | + | |
| 30 | +static int init(AVFilterContext *ctx, const char *args, void *opaque) | |
| 31 | +{ | |
| 32 | + NullContext *priv = ctx->priv; | |
| 33 | + | |
| 34 | + priv->w = 352; | |
| 35 | + priv->h = 288; | |
| 36 | + | |
| 37 | + if (args) | |
| 38 | + sscanf(args, "%d:%d", &priv->w, &priv->h); | |
| 39 | + | |
| 40 | + if (priv->w <= 0 || priv->h <= 0) { | |
| 41 | + av_log(ctx, AV_LOG_ERROR, "Non-positive size values are not acceptable.\n"); | |
| 42 | + return -1; | |
| 43 | + } | |
| 44 | + | |
| 45 | + return 0; | |
| 46 | +} | |
| 47 | + | |
| 48 | +static int config_props(AVFilterLink *outlink) | |
| 49 | +{ | |
| 50 | + NullContext *priv = outlink->src->priv; | |
| 51 | + | |
| 52 | + outlink->w = priv->w; | |
| 53 | + outlink->h = priv->h; | |
| 54 | + | |
| 55 | + av_log(outlink->src, AV_LOG_INFO, "w:%d h:%d\n", priv->w, priv->h); | |
| 56 | + | |
| 57 | + return 0; | |
| 58 | +} | |
| 59 | + | |
| 60 | +static int request_frame(AVFilterLink *link) | |
| 61 | +{ | |
| 62 | + return -1; | |
| 63 | +} | |
| 64 | + | |
| 65 | +AVFilter avfilter_vsrc_nullsrc = { | |
| 66 | + .name = "nullsrc", | |
| 67 | + .description = "Null video source, never return images.", | |
| 68 | + | |
| 69 | + .init = init, | |
| 70 | + .priv_size = sizeof(NullContext), | |
| 71 | + | |
| 72 | + .inputs = (AVFilterPad[]) {{ .name = NULL}}, | |
| 73 | + | |
| 74 | + .outputs = (AVFilterPad[]) { | |
| 75 | + { | |
| 76 | + .name = "default", | |
| 77 | + .type = CODEC_TYPE_VIDEO, | |
| 78 | + .config_props = config_props, | |
| 79 | + .request_frame = request_frame, | |
| 80 | + }, | |
| 81 | + { .name = NULL} | |
| 82 | + }, | |
| 83 | +}; | |