1/*
2 * Filter layer - default implementations
3 * copyright (c) 2007 Bobby Bingham
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 "libavcodec/imgconvert.h"
23#include "avfilter.h"
24
25/* TODO: buffer pool.  see comment for avfilter_default_get_video_buffer() */
26static void avfilter_default_free_video_buffer(AVFilterPic *pic)
27{
28    av_free(pic->data[0]);
29    av_free(pic);
30}
31
32/* TODO: set the buffer's priv member to a context structure for the whole
33 * filter chain.  This will allow for a buffer pool instead of the constant
34 * alloc & free cycle currently implemented. */
35AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
36{
37    AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
38    AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
39    int i, tempsize;
40    char *buf;
41
42    ref->pic   = pic;
43    ref->w     = pic->w = w;
44    ref->h     = pic->h = h;
45
46    /* make sure the buffer gets read permission or it's useless for output */
47    ref->perms = perms | AV_PERM_READ;
48
49    pic->refcount = 1;
50    pic->format   = link->format;
51    pic->free     = avfilter_default_free_video_buffer;
52    ff_fill_linesize((AVPicture *)pic, pic->format, ref->w);
53
54    for (i=0; i<4;i++)
55        pic->linesize[i] = FFALIGN(pic->linesize[i], 16);
56
57    tempsize = ff_fill_pointer((AVPicture *)pic, NULL, pic->format, ref->h);
58    buf = av_malloc(tempsize);
59    ff_fill_pointer((AVPicture *)pic, buf, pic->format, ref->h);
60
61    memcpy(ref->data,     pic->data,     sizeof(pic->data));
62    memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize));
63
64    return ref;
65}
66
67void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
68{
69    AVFilterLink *out = NULL;
70
71    if(link->dst->output_count)
72        out = link->dst->outputs[0];
73
74    if(out) {
75        out->outpic      = avfilter_get_video_buffer(out, AV_PERM_WRITE, out->w, out->h);
76        out->outpic->pts = picref->pts;
77        out->outpic->pos = picref->pos;
78        out->outpic->pixel_aspect = picref->pixel_aspect;
79        avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0));
80    }
81}
82
83void avfilter_default_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
84{
85    AVFilterLink *out = NULL;
86
87    if(link->dst->output_count)
88        out = link->dst->outputs[0];
89
90    if(out)
91        avfilter_draw_slice(out, y, h, slice_dir);
92}
93
94void avfilter_default_end_frame(AVFilterLink *link)
95{
96    AVFilterLink *out = NULL;
97
98    if(link->dst->output_count)
99        out = link->dst->outputs[0];
100
101    avfilter_unref_pic(link->cur_pic);
102    link->cur_pic = NULL;
103
104    if(out) {
105        if(out->outpic) {
106            avfilter_unref_pic(out->outpic);
107            out->outpic = NULL;
108        }
109        avfilter_end_frame(out);
110    }
111}
112
113/**
114 * default config_link() implementation for output video links to simplify
115 * the implementation of one input one output video filters */
116int avfilter_default_config_output_link(AVFilterLink *link)
117{
118    if(link->src->input_count && link->src->inputs[0]) {
119        link->w = link->src->inputs[0]->w;
120        link->h = link->src->inputs[0]->h;
121    } else {
122        /* XXX: any non-simple filter which would cause this branch to be taken
123         * really should implement its own config_props() for this link. */
124        return -1;
125    }
126
127    return 0;
128}
129
130/**
131 * A helper for query_formats() which sets all links to the same list of
132 * formats. If there are no links hooked to this filter, the list of formats is
133 * freed.
134 *
135 * FIXME: this will need changed for filters with a mix of pad types
136 * (video + audio, etc)
137 */
138void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
139{
140    int count = 0, i;
141
142    for(i = 0; i < ctx->input_count; i ++) {
143        if(ctx->inputs[i]) {
144            avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats);
145            count ++;
146        }
147    }
148    for(i = 0; i < ctx->output_count; i ++) {
149        if(ctx->outputs[i]) {
150            avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats);
151            count ++;
152        }
153    }
154
155    if(!count) {
156        av_free(formats->formats);
157        av_free(formats->refs);
158        av_free(formats);
159    }
160}
161
162int avfilter_default_query_formats(AVFilterContext *ctx)
163{
164    avfilter_set_common_formats(ctx, avfilter_all_colorspaces());
165    return 0;
166}
167
168void avfilter_null_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
169{
170    avfilter_start_frame(link->dst->outputs[0], picref);
171}
172
173void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
174{
175    avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
176}
177
178void avfilter_null_end_frame(AVFilterLink *link)
179{
180    avfilter_end_frame(link->dst->outputs[0]);
181}
182
183AVFilterPicRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
184{
185    return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
186}
187
188