lavfi: add error handling to start_frame().
[libav.git] / libavfilter / split.c
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 * audio and video splitter
24 */
25
26 #include "avfilter.h"
27 #include "audio.h"
28 #include "internal.h"
29 #include "video.h"
30
31 static int split_init(AVFilterContext *ctx, const char *args)
32 {
33 int i, nb_outputs = 2;
34
35 if (args) {
36 nb_outputs = strtol(args, NULL, 0);
37 if (nb_outputs <= 0) {
38 av_log(ctx, AV_LOG_ERROR, "Invalid number of outputs specified: %d.\n",
39 nb_outputs);
40 return AVERROR(EINVAL);
41 }
42 }
43
44 for (i = 0; i < nb_outputs; i++) {
45 char name[32];
46 AVFilterPad pad = { 0 };
47
48 snprintf(name, sizeof(name), "output%d", i);
49 pad.type = ctx->filter->inputs[0].type;
50 pad.name = av_strdup(name);
51
52 ff_insert_outpad(ctx, i, &pad);
53 }
54
55 return 0;
56 }
57
58 static void split_uninit(AVFilterContext *ctx)
59 {
60 int i;
61
62 for (i = 0; i < ctx->nb_outputs; i++)
63 av_freep(&ctx->output_pads[i].name);
64 }
65
66 static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
67 {
68 AVFilterContext *ctx = inlink->dst;
69 int i, ret = 0;
70
71 for (i = 0; i < ctx->nb_outputs; i++) {
72 ret = ff_start_frame(ctx->outputs[i],
73 avfilter_ref_buffer(picref, ~AV_PERM_WRITE));
74 if (ret < 0)
75 break;
76 }
77 return ret;
78 }
79
80 static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
81 {
82 AVFilterContext *ctx = inlink->dst;
83 int i;
84
85 for (i = 0; i < ctx->nb_outputs; i++)
86 ff_draw_slice(ctx->outputs[i], y, h, slice_dir);
87 }
88
89 static void end_frame(AVFilterLink *inlink)
90 {
91 AVFilterContext *ctx = inlink->dst;
92 int i;
93
94 for (i = 0; i < ctx->nb_outputs; i++)
95 ff_end_frame(ctx->outputs[i]);
96 }
97
98 AVFilter avfilter_vf_split = {
99 .name = "split",
100 .description = NULL_IF_CONFIG_SMALL("Pass on the input to two outputs."),
101
102 .init = split_init,
103 .uninit = split_uninit,
104
105 .inputs = (const AVFilterPad[]) {{ .name = "default",
106 .type = AVMEDIA_TYPE_VIDEO,
107 .get_video_buffer= ff_null_get_video_buffer,
108 .start_frame = start_frame,
109 .draw_slice = draw_slice,
110 .end_frame = end_frame, },
111 { .name = NULL}},
112 .outputs = (const AVFilterPad[]) {{ .name = NULL}},
113 };
114
115 static int filter_samples(AVFilterLink *inlink, AVFilterBufferRef *samplesref)
116 {
117 AVFilterContext *ctx = inlink->dst;
118 int i, ret = 0;
119
120 for (i = 0; i < ctx->nb_outputs; i++) {
121 ret = ff_filter_samples(inlink->dst->outputs[i],
122 avfilter_ref_buffer(samplesref, ~AV_PERM_WRITE));
123 if (ret < 0)
124 break;
125 }
126 avfilter_unref_buffer(samplesref);
127 return ret;
128 }
129
130 AVFilter avfilter_af_asplit = {
131 .name = "asplit",
132 .description = NULL_IF_CONFIG_SMALL("Pass on the audio input to N audio outputs."),
133
134 .init = split_init,
135 .uninit = split_uninit,
136
137 .inputs = (const AVFilterPad[]) {{ .name = "default",
138 .type = AVMEDIA_TYPE_AUDIO,
139 .get_audio_buffer = ff_null_get_audio_buffer,
140 .filter_samples = filter_samples },
141 { .name = NULL }},
142 .outputs = (const AVFilterPad[]) {{ .name = NULL }},
143 };