Statistics
| Branch: | Revision:

ffmpeg / libavfilter / vsrc_buffer.c @ efdc74ef

History | View | Annotate | Download (4.32 KB)

1
/*
2
 * Memory buffer source filter
3
 * Copyright (c) 2008 Vitor Sessak
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
#include "avfilter.h"
23
#include "vsrc_buffer.h"
24

    
25
typedef struct {
26
    int64_t           pts;
27
    AVFrame           frame;
28
    int               has_frame;
29
    int               h, w, pix_fmt;
30
    AVRational        pixel_aspect;
31
} BufferSourceContext;
32

    
33

    
34
int av_vsrc_buffer_add_frame(AVFilterContext *buffer_filter, AVFrame *frame,
35
                             int64_t pts, AVRational pixel_aspect)
36
{
37
    BufferSourceContext *c = buffer_filter->priv;
38

    
39
    if (c->has_frame) {
40
        av_log(buffer_filter, AV_LOG_ERROR,
41
               "Buffering several frames is not supported. "
42
               "Please consume all available frames before adding a new one.\n"
43
            );
44
        //return -1;
45
    }
46

    
47
    memcpy(c->frame.data    , frame->data    , sizeof(frame->data));
48
    memcpy(c->frame.linesize, frame->linesize, sizeof(frame->linesize));
49
    c->frame.interlaced_frame= frame->interlaced_frame;
50
    c->frame.top_field_first = frame->top_field_first;
51
    c->pts = pts;
52
    c->pixel_aspect = pixel_aspect;
53
    c->has_frame = 1;
54

    
55
    return 0;
56
}
57

    
58
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
59
{
60
    BufferSourceContext *c = ctx->priv;
61

    
62
    if(args && sscanf(args, "%d:%d:%d", &c->w, &c->h, &c->pix_fmt) == 3)
63
        return 0;
64

    
65
    av_log(ctx, AV_LOG_ERROR, "init() expected 3 arguments:'%s'\n", args);
66
    return -1;
67
}
68

    
69
static int query_formats(AVFilterContext *ctx)
70
{
71
    BufferSourceContext *c = ctx->priv;
72
    enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
73

    
74
    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
75
    return 0;
76
}
77

    
78
static int config_props(AVFilterLink *link)
79
{
80
    BufferSourceContext *c = link->src->priv;
81

    
82
    link->w = c->w;
83
    link->h = c->h;
84

    
85
    return 0;
86
}
87

    
88

    
89
static int request_frame(AVFilterLink *link)
90
{
91
    BufferSourceContext *c = link->src->priv;
92
    AVFilterPicRef *picref;
93

    
94
    if (!c->has_frame) {
95
        av_log(link->src, AV_LOG_ERROR,
96
               "request_frame() called with no available frame!\n");
97
        //return -1;
98
    }
99

    
100
    /* This picture will be needed unmodified later for decoding the next
101
     * frame */
102
    picref = avfilter_get_video_buffer(link, AV_PERM_WRITE | AV_PERM_PRESERVE |
103
                                       AV_PERM_REUSE2,
104
                                       link->w, link->h);
105

    
106
    av_picture_copy((AVPicture *)&picref->data, (AVPicture *)&c->frame,
107
                    picref->pic->format, link->w, link->h);
108

    
109
    picref->pts = c->pts;
110
    picref->pixel_aspect = c->pixel_aspect;
111
    picref->interlaced      = c->frame.interlaced_frame;
112
    picref->top_field_first = c->frame.top_field_first;
113
    avfilter_start_frame(link, avfilter_ref_pic(picref, ~0));
114
    avfilter_draw_slice(link, 0, link->h, 1);
115
    avfilter_end_frame(link);
116
    avfilter_unref_pic(picref);
117

    
118
    c->has_frame = 0;
119

    
120
    return 0;
121
}
122

    
123
static int poll_frame(AVFilterLink *link)
124
{
125
    BufferSourceContext *c = link->src->priv;
126
    return !!(c->has_frame);
127
}
128

    
129
AVFilter avfilter_vsrc_buffer =
130
{
131
    .name      = "buffer",
132
    .priv_size = sizeof(BufferSourceContext),
133
    .query_formats = query_formats,
134

    
135
    .init      = init,
136

    
137
    .inputs    = (AVFilterPad[]) {{ .name = NULL }},
138
    .outputs   = (AVFilterPad[]) {{ .name            = "default",
139
                                    .type            = AVMEDIA_TYPE_VIDEO,
140
                                    .request_frame   = request_frame,
141
                                    .poll_frame      = poll_frame,
142
                                    .config_props    = config_props, },
143
                                  { .name = NULL}},
144
};