Move 3 direct MV related functions that i left out from h263.c to mpeg4video.c.
[libav.git] / libavfilter / vf_scale.c
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1/*
2 * copyright (c) 2007 Bobby Bingham
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21/**
22 * @file libavfilter/vf_scale.c
23 * scale video filter
24 */
25
26#include "avfilter.h"
27#include "libswscale/swscale.h"
28
29typedef struct {
30 struct SwsContext *sws; ///< software scaler context
31
32 /**
33 * New dimensions. Special values are:
34 * 0 = original width/height
35 * -1 = keep original aspect
36 */
37 int w, h;
38
39 int hsub, vsub; ///< chroma subsampling
40 int slice_y; ///< top of current output slice
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41 int input_is_pal; ///< set to 1 if the input format is paletted
42} ScaleContext;
43
44static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
45{
46 ScaleContext *scale = ctx->priv;
47
48 if (args)
49 sscanf(args, "%d:%d", &scale->w, &scale->h);
50
51 /* sanity check params */
52 if (scale->w < -1 || scale->h < -1) {
53 av_log(ctx, AV_LOG_ERROR, "Size values less than -1 are not acceptable.\n");
54 return -1;
55 }
56 if (scale->w == -1 && scale->h == -1)
57 scale->w = scale->h = 0;
58
59 return 0;
60}
61
62static av_cold void uninit(AVFilterContext *ctx)
63{
64 ScaleContext *scale = ctx->priv;
65 sws_freeContext(scale->sws);
66 scale->sws = NULL;
67}
68
69static int query_formats(AVFilterContext *ctx)
70{
71 AVFilterFormats *formats;
72
73 if (ctx->inputs[0]) {
74 formats = avfilter_all_colorspaces();
75 avfilter_formats_ref(formats, &ctx->inputs[0]->out_formats);
76 }
77 if (ctx->outputs[0]) {
78 formats = avfilter_all_colorspaces();
79 avfilter_formats_ref(formats, &ctx->outputs[0]->in_formats);
80 }
81
82 return 0;
83}
84
85static int config_props(AVFilterLink *outlink)
86{
87 AVFilterContext *ctx = outlink->src;
88 AVFilterLink *inlink = outlink->src->inputs[0];
89 ScaleContext *scale = ctx->priv;
90 int64_t w, h;
91
92 if (!(w = scale->w))
93 w = inlink->w;
94 if (!(h = scale->h))
95 h = inlink->h;
96 if (w == -1)
97 w = av_rescale(h, inlink->w, inlink->h);
98 if (h == -1)
99 h = av_rescale(w, inlink->h, inlink->w);
100
101 if (w > INT_MAX || h > INT_MAX ||
102 (h * inlink->w) > INT_MAX ||
103 (w * inlink->h) > INT_MAX)
104 av_log(ctx, AV_LOG_ERROR, "Rescaled value for width or height is too big.\n");
105
106 outlink->w = w;
107 outlink->h = h;
108
109 /* TODO: make algorithm configurable */
110 scale->sws = sws_getContext(inlink ->w, inlink ->h, inlink ->format,
111 outlink->w, outlink->h, outlink->format,
112 SWS_BILINEAR, NULL, NULL, NULL);
113
114 av_log(ctx, AV_LOG_INFO, "w:%d h:%d fmt:%s\n",
115 outlink->w, outlink->h, avcodec_get_pix_fmt_name(outlink->format));
116
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117 scale->input_is_pal = inlink->format == PIX_FMT_PAL8 ||
118 inlink->format == PIX_FMT_BGR4_BYTE ||
119 inlink->format == PIX_FMT_RGB4_BYTE ||
120 inlink->format == PIX_FMT_BGR8 ||
121 inlink->format == PIX_FMT_RGB8;
122
123 return !scale->sws;
124}
125
126static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
127{
128 ScaleContext *scale = link->dst->priv;
129 AVFilterLink *outlink = link->dst->outputs[0];
130 AVFilterPicRef *outpicref;
131
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132 avcodec_get_chroma_sub_sample(link->format, &scale->hsub, &scale->vsub);
133
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134 outpicref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
135 outpicref->pts = picref->pts;
136 outlink->outpic = outpicref;
137
138 av_reduce(&outpicref->pixel_aspect.num, &outpicref->pixel_aspect.den,
139 (int64_t)picref->pixel_aspect.num * outlink->h * link->w,
140 (int64_t)picref->pixel_aspect.den * outlink->w * link->h,
141 INT_MAX);
142
a13a5437 143 scale->slice_y = 0;
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144 avfilter_start_frame(outlink, avfilter_ref_pic(outpicref, ~0));
145}
146
a13a5437 147static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
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148{
149 ScaleContext *scale = link->dst->priv;
150 int out_h;
151 AVFilterPicRef *cur_pic = link->cur_pic;
152 uint8_t *data[4];
153
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154 if (scale->slice_y == 0 && slice_dir == -1)
155 scale->slice_y = link->dst->outputs[0]->h;
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156
157 data[0] = cur_pic->data[0] + y * cur_pic->linesize[0];
158 data[1] = scale->input_is_pal ?
159 cur_pic->data[1] :
160 cur_pic->data[1] + (y>>scale->vsub) * cur_pic->linesize[1];
161 data[2] = cur_pic->data[2] + (y>>scale->vsub) * cur_pic->linesize[2];
162 data[3] = cur_pic->data[3] + y * cur_pic->linesize[3];
163
164 out_h = sws_scale(scale->sws, data, cur_pic->linesize, y, h,
165 link->dst->outputs[0]->outpic->data,
166 link->dst->outputs[0]->outpic->linesize);
167
a13a5437 168 if (slice_dir == -1)
c3eabb7d 169 scale->slice_y -= out_h;
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170 avfilter_draw_slice(link->dst->outputs[0], scale->slice_y, out_h, slice_dir);
171 if (slice_dir == 1)
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172 scale->slice_y += out_h;
173}
174
175AVFilter avfilter_vf_scale = {
176 .name = "scale",
177 .description = "Scale the input video to width:height size and/or convert the image format.",
178
179 .init = init,
180 .uninit = uninit,
181
182 .query_formats = query_formats,
183
184 .priv_size = sizeof(ScaleContext),
185
186 .inputs = (AVFilterPad[]) {{ .name = "default",
187 .type = CODEC_TYPE_VIDEO,
188 .start_frame = start_frame,
189 .draw_slice = draw_slice,
190 .min_perms = AV_PERM_READ, },
191 { .name = NULL}},
192 .outputs = (AVFilterPad[]) {{ .name = "default",
193 .type = CODEC_TYPE_VIDEO,
194 .config_props = config_props, },
195 { .name = NULL}},
196};