summaryrefslogtreecommitdiffstats
path: root/libavfilter/video.c
blob: a493204df2370c2d438a8340f55ac89d0fd3befb (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
/*
 * Copyright 2007 Bobby Bingham
 * Copyright Stefano Sabatini <stefasab gmail com>
 * Copyright Vitor Sessak <vitor1001 gmail com>
 *
 * 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 <string.h>
#include <stdio.h>

#include "libavutil/avassert.h"
#include "libavutil/imgutils.h"
#include "libavutil/mem.h"

#include "avfilter.h"
#include "internal.h"
#include "video.h"

AVFilterBufferRef *ff_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
{
    return ff_get_video_buffer(link->dst->outputs[0], perms, w, h);
}

AVFilterBufferRef *ff_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
{
    int linesize[4];
    uint8_t *data[4];
    int i;
    AVFilterBufferRef *picref = NULL;
    AVFilterPool *pool = link->pool;
    int full_perms = AV_PERM_READ | AV_PERM_WRITE | AV_PERM_PRESERVE |
                     AV_PERM_REUSE | AV_PERM_REUSE2 | AV_PERM_ALIGN;

    av_assert1(!(perms & ~(full_perms | AV_PERM_NEG_LINESIZES)));

    if (pool) {
        for (i = 0; i < POOL_SIZE; i++) {
            picref = pool->pic[i];
            if (picref && picref->buf->format == link->format && picref->buf->w == w && picref->buf->h == h) {
                AVFilterBuffer *pic = picref->buf;
                pool->pic[i] = NULL;
                pool->count--;
                av_assert0(!picref->video->qp_table);
                picref->video->w = w;
                picref->video->h = h;
                picref->perms = full_perms;
                picref->format = link->format;
                pic->refcount = 1;
                memcpy(picref->data,     pic->data,     sizeof(picref->data));
                memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
                pool->refcount++;
                return picref;
            }
        }
    } else {
        pool = link->pool = av_mallocz(sizeof(AVFilterPool));
        pool->refcount = 1;
    }

    // align: +2 is needed for swscaler, +16 to be SIMD-friendly
    if ((i = av_image_alloc(data, linesize, w, h, link->format, 32)) < 0)
        return NULL;

    picref = avfilter_get_video_buffer_ref_from_arrays(data, linesize,
                                                       full_perms, w, h, link->format);
    if (!picref) {
        av_free(data[0]);
        return NULL;
    }

    memset(data[0], 128, i);

    picref->buf->priv = pool;
    picref->buf->free = NULL;
    pool->refcount++;

    return picref;
}

AVFilterBufferRef *
avfilter_get_video_buffer_ref_from_arrays(uint8_t * const data[4], const int linesize[4], int perms,
                                          int w, int h, enum AVPixelFormat format)
{
    AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
    AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));

    if (!pic || !picref)
        goto fail;

    picref->buf = pic;
    picref->buf->free = ff_avfilter_default_free_buffer;
    if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
        goto fail;

    pic->w = picref->video->w = w;
    pic->h = picref->video->h = h;

    /* make sure the buffer gets read permission or it's useless for output */
    picref->perms = perms | AV_PERM_READ;

    pic->refcount = 1;
    picref->type = AVMEDIA_TYPE_VIDEO;
    pic->format = picref->format = format;

    memcpy(pic->data,        data,          4*sizeof(data[0]));
    memcpy(pic->linesize,    linesize,      4*sizeof(linesize[0]));
    memcpy(picref->data,     pic->data,     sizeof(picref->data));
    memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));

    pic->   extended_data = pic->data;
    picref->extended_data = picref->data;

    picref->pts = AV_NOPTS_VALUE;

    return picref;

fail:
    if (picref && picref->video)
        av_free(picref->video);
    av_free(picref);
    av_free(pic);
    return NULL;
}

AVFilterBufferRef *ff_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
{
    AVFilterBufferRef *ret = NULL;

    av_unused char buf[16];
    FF_TPRINTF_START(NULL, get_video_buffer); ff_tlog_link(NULL, link, 0);
    ff_tlog(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);

    if (link->dstpad->get_video_buffer)
        ret = link->dstpad->get_video_buffer(link, perms, w, h);

    if (!ret)
        ret = ff_default_get_video_buffer(link, perms, w, h);

    if (ret)
        ret->type = AVMEDIA_TYPE_VIDEO;

    FF_TPRINTF_START(NULL, get_video_buffer); ff_tlog_link(NULL, link, 0); ff_tlog(NULL, " returning "); ff_tlog_ref(NULL, ret, 1);

    return ret;
}
OpenPOWER on IntegriCloud