summaryrefslogtreecommitdiffstats
path: root/libavfilter/f_reverse.c
blob: 5bf71b38edb68db5e10625400d94ed46b25a7bab (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
/*
 * Copyright (c) 2015 Derek Buitenhuis
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"

#define DEFAULT_LENGTH 300

typedef struct ReverseContext {
    int nb_frames;
    AVFrame **frames;
    unsigned int frames_size;
    unsigned int pts_size;
    int64_t *pts;
    int flush_idx;
} ReverseContext;

static av_cold int init(AVFilterContext *ctx)
{
    ReverseContext *s = ctx->priv;

    s->pts = av_fast_realloc(NULL, &s->pts_size,
                             DEFAULT_LENGTH * sizeof(*(s->pts)));
    if (!s->pts)
        return AVERROR(ENOMEM);

    s->frames = av_fast_realloc(NULL, &s->frames_size,
                                DEFAULT_LENGTH * sizeof(*(s->frames)));
    if (!s->frames) {
        av_freep(&s->pts);
        return AVERROR(ENOMEM);
    }

    return 0;
}

static av_cold void uninit(AVFilterContext *ctx)
{
    ReverseContext *s = ctx->priv;

    av_freep(&s->pts);
    av_freep(&s->frames);
}

static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
    AVFilterContext *ctx = inlink->dst;
    ReverseContext *s    = ctx->priv;
    void *ptr;

    if (s->nb_frames + 1 > s->pts_size / sizeof(*(s->pts))) {
        ptr = av_fast_realloc(s->pts, &s->pts_size, s->pts_size * 2);
        if (!ptr)
            return AVERROR(ENOMEM);
        s->pts = ptr;
    }

    if (s->nb_frames + 1 > s->frames_size / sizeof(*(s->frames))) {
        ptr = av_fast_realloc(s->frames, &s->frames_size, s->frames_size * 2);
        if (!ptr)
            return AVERROR(ENOMEM);
        s->frames = ptr;
    }

    s->frames[s->nb_frames] = in;
    s->pts[s->nb_frames]    = in->pts;
    s->nb_frames++;

    return 0;
}

#if CONFIG_REVERSE_FILTER

static int request_frame(AVFilterLink *outlink)
{
    AVFilterContext *ctx = outlink->src;
    ReverseContext *s = ctx->priv;
    int ret;

    ret = ff_request_frame(ctx->inputs[0]);

    if (ret == AVERROR_EOF && s->nb_frames > 0) {
        AVFrame *out = s->frames[s->nb_frames - 1];
        out->pts     = s->pts[s->flush_idx++];
        ret          = ff_filter_frame(outlink, out);
        s->nb_frames--;
    }

    return ret;
}

static const AVFilterPad reverse_inputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .filter_frame = filter_frame,
    },
    { NULL }
};

static const AVFilterPad reverse_outputs[] = {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_VIDEO,
        .request_frame = request_frame,
    },
    { NULL }
};

AVFilter ff_vf_reverse = {
    .name        = "reverse",
    .description = NULL_IF_CONFIG_SMALL("Reverse a clip."),
    .priv_size   = sizeof(ReverseContext),
    .init        = init,
    .uninit      = uninit,
    .inputs      = reverse_inputs,
    .outputs     = reverse_outputs,
};

#endif /* CONFIG_REVERSE_FILTER */

#if CONFIG_AREVERSE_FILTER

static int query_formats(AVFilterContext *ctx)
{
    AVFilterFormats *formats;
    AVFilterChannelLayouts *layouts;
    int ret;

    layouts = ff_all_channel_counts();
    if (!layouts)
        return AVERROR(ENOMEM);
    ret = ff_set_common_channel_layouts(ctx, layouts);
    if (ret < 0)
        return ret;

    ret = ff_set_common_formats(ctx, ff_planar_sample_fmts());
    if (ret < 0)
        return ret;

    formats = ff_all_samplerates();
    if (!formats)
        return AVERROR(ENOMEM);
    return ff_set_common_samplerates(ctx, formats);
}

static int areverse_request_frame(AVFilterLink *outlink)
{
    AVFilterContext *ctx = outlink->src;
    ReverseContext *s = ctx->priv;
    int ret, p, i, j;

    ret = ff_request_frame(ctx->inputs[0]);

    if (ret == AVERROR_EOF && s->nb_frames > 0) {
        AVFrame *out = s->frames[s->nb_frames - 1];
        out->pts     = s->pts[s->flush_idx++];

        for (p = 0; p < outlink->channels; p++) {
            switch (outlink->format) {
            case AV_SAMPLE_FMT_U8P: {
                uint8_t *dst = (uint8_t *)out->extended_data[p];
                for (i = 0, j = out->nb_samples - 1; i < j; i++, j--)
                    FFSWAP(uint8_t, dst[i], dst[j]);
            }
                break;
            case AV_SAMPLE_FMT_S16P: {
                int16_t *dst = (int16_t *)out->extended_data[p];
                for (i = 0, j = out->nb_samples - 1; i < j; i++, j--)
                    FFSWAP(int16_t, dst[i], dst[j]);
            }
                break;
            case AV_SAMPLE_FMT_S32P: {
                int32_t *dst = (int32_t *)out->extended_data[p];
                for (i = 0, j = out->nb_samples - 1; i < j; i++, j--)
                    FFSWAP(int32_t, dst[i], dst[j]);
            }
                break;
            case AV_SAMPLE_FMT_FLTP: {
                float *dst = (float *)out->extended_data[p];
                for (i = 0, j = out->nb_samples - 1; i < j; i++, j--)
                    FFSWAP(float, dst[i], dst[j]);
            }
                break;
            case AV_SAMPLE_FMT_DBLP: {
                double *dst = (double *)out->extended_data[p];
                for (i = 0, j = out->nb_samples - 1; i < j; i++, j--)
                    FFSWAP(double, dst[i], dst[j]);
            }
                break;
            }
        }

        ret = ff_filter_frame(outlink, out);
        s->nb_frames--;
    }

    return ret;
}

static const AVFilterPad areverse_inputs[] = {
    {
        .name           = "default",
        .type           = AVMEDIA_TYPE_AUDIO,
        .filter_frame   = filter_frame,
        .needs_writable = 1,
    },
    { NULL }
};

static const AVFilterPad areverse_outputs[] = {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_AUDIO,
        .request_frame = areverse_request_frame,
    },
    { NULL }
};

AVFilter ff_af_areverse = {
    .name          = "areverse",
    .description   = NULL_IF_CONFIG_SMALL("Reverse an audio clip."),
    .query_formats = query_formats,
    .priv_size     = sizeof(ReverseContext),
    .init          = init,
    .uninit        = uninit,
    .inputs        = areverse_inputs,
    .outputs       = areverse_outputs,
};

#endif /* CONFIG_AREVERSE_FILTER */
OpenPOWER on IntegriCloud