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path: root/libavfilter/f_reverse.c (plain)
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1/*
2 * Copyright (c) 2015 Derek Buitenhuis
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include "libavutil/opt.h"
22#include "avfilter.h"
23#include "formats.h"
24#include "internal.h"
25#include "video.h"
26
27#define DEFAULT_LENGTH 300
28
29typedef struct ReverseContext {
30 int nb_frames;
31 AVFrame **frames;
32 unsigned int frames_size;
33 unsigned int pts_size;
34 int64_t *pts;
35 int flush_idx;
36} ReverseContext;
37
38static av_cold int init(AVFilterContext *ctx)
39{
40 ReverseContext *s = ctx->priv;
41
42 s->pts = av_fast_realloc(NULL, &s->pts_size,
43 DEFAULT_LENGTH * sizeof(*(s->pts)));
44 if (!s->pts)
45 return AVERROR(ENOMEM);
46
47 s->frames = av_fast_realloc(NULL, &s->frames_size,
48 DEFAULT_LENGTH * sizeof(*(s->frames)));
49 if (!s->frames) {
50 av_freep(&s->pts);
51 return AVERROR(ENOMEM);
52 }
53
54 return 0;
55}
56
57static av_cold void uninit(AVFilterContext *ctx)
58{
59 ReverseContext *s = ctx->priv;
60
61 av_freep(&s->pts);
62 av_freep(&s->frames);
63}
64
65static int filter_frame(AVFilterLink *inlink, AVFrame *in)
66{
67 AVFilterContext *ctx = inlink->dst;
68 ReverseContext *s = ctx->priv;
69 void *ptr;
70
71 if (s->nb_frames + 1 > s->pts_size / sizeof(*(s->pts))) {
72 ptr = av_fast_realloc(s->pts, &s->pts_size, s->pts_size * 2);
73 if (!ptr)
74 return AVERROR(ENOMEM);
75 s->pts = ptr;
76 }
77
78 if (s->nb_frames + 1 > s->frames_size / sizeof(*(s->frames))) {
79 ptr = av_fast_realloc(s->frames, &s->frames_size, s->frames_size * 2);
80 if (!ptr)
81 return AVERROR(ENOMEM);
82 s->frames = ptr;
83 }
84
85 s->frames[s->nb_frames] = in;
86 s->pts[s->nb_frames] = in->pts;
87 s->nb_frames++;
88
89 return 0;
90}
91
92#if CONFIG_REVERSE_FILTER
93
94static int request_frame(AVFilterLink *outlink)
95{
96 AVFilterContext *ctx = outlink->src;
97 ReverseContext *s = ctx->priv;
98 int ret;
99
100 ret = ff_request_frame(ctx->inputs[0]);
101
102 if (ret == AVERROR_EOF && s->nb_frames > 0) {
103 AVFrame *out = s->frames[s->nb_frames - 1];
104 out->pts = s->pts[s->flush_idx++];
105 ret = ff_filter_frame(outlink, out);
106 s->nb_frames--;
107 }
108
109 return ret;
110}
111
112static const AVFilterPad reverse_inputs[] = {
113 {
114 .name = "default",
115 .type = AVMEDIA_TYPE_VIDEO,
116 .filter_frame = filter_frame,
117 },
118 { NULL }
119};
120
121static const AVFilterPad reverse_outputs[] = {
122 {
123 .name = "default",
124 .type = AVMEDIA_TYPE_VIDEO,
125 .request_frame = request_frame,
126 },
127 { NULL }
128};
129
130AVFilter ff_vf_reverse = {
131 .name = "reverse",
132 .description = NULL_IF_CONFIG_SMALL("Reverse a clip."),
133 .priv_size = sizeof(ReverseContext),
134 .init = init,
135 .uninit = uninit,
136 .inputs = reverse_inputs,
137 .outputs = reverse_outputs,
138};
139
140#endif /* CONFIG_REVERSE_FILTER */
141
142#if CONFIG_AREVERSE_FILTER
143
144static int query_formats(AVFilterContext *ctx)
145{
146 AVFilterFormats *formats;
147 AVFilterChannelLayouts *layouts;
148 int ret;
149
150 layouts = ff_all_channel_counts();
151 if (!layouts)
152 return AVERROR(ENOMEM);
153 ret = ff_set_common_channel_layouts(ctx, layouts);
154 if (ret < 0)
155 return ret;
156
157 ret = ff_set_common_formats(ctx, ff_planar_sample_fmts());
158 if (ret < 0)
159 return ret;
160
161 formats = ff_all_samplerates();
162 if (!formats)
163 return AVERROR(ENOMEM);
164 return ff_set_common_samplerates(ctx, formats);
165}
166
167static int areverse_request_frame(AVFilterLink *outlink)
168{
169 AVFilterContext *ctx = outlink->src;
170 ReverseContext *s = ctx->priv;
171 int ret, p, i, j;
172
173 ret = ff_request_frame(ctx->inputs[0]);
174
175 if (ret == AVERROR_EOF && s->nb_frames > 0) {
176 AVFrame *out = s->frames[s->nb_frames - 1];
177 out->pts = s->pts[s->flush_idx++];
178
179 for (p = 0; p < outlink->channels; p++) {
180 switch (outlink->format) {
181 case AV_SAMPLE_FMT_U8P: {
182 uint8_t *dst = (uint8_t *)out->extended_data[p];
183 for (i = 0, j = out->nb_samples - 1; i < j; i++, j--)
184 FFSWAP(uint8_t, dst[i], dst[j]);
185 }
186 break;
187 case AV_SAMPLE_FMT_S16P: {
188 int16_t *dst = (int16_t *)out->extended_data[p];
189 for (i = 0, j = out->nb_samples - 1; i < j; i++, j--)
190 FFSWAP(int16_t, dst[i], dst[j]);
191 }
192 break;
193 case AV_SAMPLE_FMT_S32P: {
194 int32_t *dst = (int32_t *)out->extended_data[p];
195 for (i = 0, j = out->nb_samples - 1; i < j; i++, j--)
196 FFSWAP(int32_t, dst[i], dst[j]);
197 }
198 break;
199 case AV_SAMPLE_FMT_FLTP: {
200 float *dst = (float *)out->extended_data[p];
201 for (i = 0, j = out->nb_samples - 1; i < j; i++, j--)
202 FFSWAP(float, dst[i], dst[j]);
203 }
204 break;
205 case AV_SAMPLE_FMT_DBLP: {
206 double *dst = (double *)out->extended_data[p];
207 for (i = 0, j = out->nb_samples - 1; i < j; i++, j--)
208 FFSWAP(double, dst[i], dst[j]);
209 }
210 break;
211 }
212 }
213
214 ret = ff_filter_frame(outlink, out);
215 s->nb_frames--;
216 }
217
218 return ret;
219}
220
221static const AVFilterPad areverse_inputs[] = {
222 {
223 .name = "default",
224 .type = AVMEDIA_TYPE_AUDIO,
225 .filter_frame = filter_frame,
226 .needs_writable = 1,
227 },
228 { NULL }
229};
230
231static const AVFilterPad areverse_outputs[] = {
232 {
233 .name = "default",
234 .type = AVMEDIA_TYPE_AUDIO,
235 .request_frame = areverse_request_frame,
236 },
237 { NULL }
238};
239
240AVFilter ff_af_areverse = {
241 .name = "areverse",
242 .description = NULL_IF_CONFIG_SMALL("Reverse an audio clip."),
243 .query_formats = query_formats,
244 .priv_size = sizeof(ReverseContext),
245 .init = init,
246 .uninit = uninit,
247 .inputs = areverse_inputs,
248 .outputs = areverse_outputs,
249};
250
251#endif /* CONFIG_AREVERSE_FILTER */
252
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