aboutsummaryrefslogtreecommitdiffstats
path: root/libavfilter/defaults.c
blob: 27c8a3bcdcfadded40643a547eca4376d2d44350 (plain) (blame)
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
/*
 * Filter layer - default implementations
 * copyright (c) 2007 Bobby Bingham
 *
 * 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 "libavcodec/imgconvert.h"
#include "avfilter.h"

/* TODO: buffer pool.  see comment for avfilter_default_get_video_buffer() */
static void avfilter_default_free_buffer(AVFilterBuffer *ptr)
{
    av_free(ptr->data[0]);
    av_free(ptr);
}

/* TODO: set the buffer's priv member to a context structure for the whole
 * filter chain.  This will allow for a buffer pool instead of the constant
 * alloc & free cycle currently implemented. */
AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
{
    AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
    AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
    int i, tempsize;
    char *buf;

    ref->pic   = pic;
    ref->w     = w;
    ref->h     = h;

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

    pic->refcount = 1;
    pic->format   = link->format;
    pic->free     = avfilter_default_free_buffer;
    ff_fill_linesize((AVPicture *)pic, pic->format, ref->w);

    for (i=0; i<4;i++)
        pic->linesize[i] = FFALIGN(pic->linesize[i], 16);

    tempsize = ff_fill_pointer((AVPicture *)pic, NULL, pic->format, ref->h);
    buf = av_malloc(tempsize + 16); // +2 is needed for swscaler, +16 to be
                                    // SIMD-friendly
    ff_fill_pointer((AVPicture *)pic, buf, pic->format, ref->h);

    memcpy(ref->data,     pic->data,     sizeof(pic->data));
    memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize));

    return ref;
}

void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
{
    AVFilterLink *out = NULL;

    if(link->dst->output_count)
        out = link->dst->outputs[0];

    if(out) {
        out->outpic      = avfilter_get_video_buffer(out, AV_PERM_WRITE, out->w, out->h);
        avfilter_copy_picref_props(out->outpic, picref);
        avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0));
    }
}

void avfilter_default_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
{
    AVFilterLink *out = NULL;

    if(link->dst->output_count)
        out = link->dst->outputs[0];

    if(out)
        avfilter_draw_slice(out, y, h, slice_dir);
}

void avfilter_default_end_frame(AVFilterLink *link)
{
    AVFilterLink *out = NULL;

    if(link->dst->output_count)
        out = link->dst->outputs[0];

    avfilter_unref_pic(link->cur_pic);
    link->cur_pic = NULL;

    if(out) {
        if(out->outpic) {
            avfilter_unref_pic(out->outpic);
            out->outpic = NULL;
        }
        avfilter_end_frame(out);
    }
}

/**
 * default config_link() implementation for output video links to simplify
 * the implementation of one input one output video filters */
int avfilter_default_config_output_link(AVFilterLink *link)
{
    if(link->src->input_count && link->src->inputs[0]) {
        link->w = link->src->inputs[0]->w;
        link->h = link->src->inputs[0]->h;
    } else {
        /* XXX: any non-simple filter which would cause this branch to be taken
         * really should implement its own config_props() for this link. */
        return -1;
    }

    return 0;
}

/**
 * A helper for query_formats() which sets all links to the same list of
 * formats. If there are no links hooked to this filter, the list of formats is
 * freed.
 *
 * FIXME: this will need changed for filters with a mix of pad types
 * (video + audio, etc)
 */
void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
{
    int count = 0, i;

    for(i = 0; i < ctx->input_count; i ++) {
        if(ctx->inputs[i]) {
            avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats);
            count ++;
        }
    }
    for(i = 0; i < ctx->output_count; i ++) {
        if(ctx->outputs[i]) {
            avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats);
            count ++;
        }
    }

    if(!count) {
        av_free(formats->formats);
        av_free(formats->refs);
        av_free(formats);
    }
}

int avfilter_default_query_formats(AVFilterContext *ctx)
{
    enum AVMediaType type = ctx->inputs [0] ? ctx->inputs [0]->type :
                            ctx->outputs[0] ? ctx->outputs[0]->type :
                            AVMEDIA_TYPE_VIDEO;

    avfilter_set_common_formats(ctx, avfilter_all_formats(type));
    return 0;
}

void avfilter_null_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
{
    avfilter_start_frame(link->dst->outputs[0], picref);
}

void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
{
    avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
}

void avfilter_null_end_frame(AVFilterLink *link)
{
    avfilter_end_frame(link->dst->outputs[0]);
}

AVFilterPicRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
{
    return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
}