yadif: support 16-bit
[libav.git] / libavfilter / vf_scale.c
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c3eabb7d 1/*
3fa77bde 2 * Copyright (c) 2007 Bobby Bingham
c3eabb7d 3 *
2912e87a 4 * This file is part of Libav.
c3eabb7d 5 *
2912e87a 6 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 11 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 17 * License along with Libav; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21/**
ba87f080 22 * @file
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23 * scale video filter
24 */
25
26#include "avfilter.h"
b4b66456 27#include "libavutil/pixdesc.h"
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28#include "libswscale/swscale.h"
29
30typedef struct {
31 struct SwsContext *sws; ///< software scaler context
32
33 /**
34 * New dimensions. Special values are:
35 * 0 = original width/height
36 * -1 = keep original aspect
37 */
38 int w, h;
8155bbc9 39 unsigned int flags; ///sws flags
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40
41 int hsub, vsub; ///< chroma subsampling
42 int slice_y; ///< top of current output slice
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43 int input_is_pal; ///< set to 1 if the input format is paletted
44} ScaleContext;
45
46static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
47{
48 ScaleContext *scale = ctx->priv;
a0aa7354 49 const char *p;
c3eabb7d 50
8155bbc9 51 scale->flags = SWS_BILINEAR;
46daee6e 52 if (args) {
c3eabb7d 53 sscanf(args, "%d:%d", &scale->w, &scale->h);
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54 p = strstr(args,"flags=");
55 if (p) scale->flags = strtoul(p+6, NULL, 0);
8155bbc9 56 }
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57
58 /* sanity check params */
59 if (scale->w < -1 || scale->h < -1) {
60 av_log(ctx, AV_LOG_ERROR, "Size values less than -1 are not acceptable.\n");
c10676ac 61 return AVERROR(EINVAL);
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62 }
63 if (scale->w == -1 && scale->h == -1)
64 scale->w = scale->h = 0;
65
66 return 0;
67}
68
69static av_cold void uninit(AVFilterContext *ctx)
70{
71 ScaleContext *scale = ctx->priv;
72 sws_freeContext(scale->sws);
73 scale->sws = NULL;
74}
75
76static int query_formats(AVFilterContext *ctx)
77{
78 AVFilterFormats *formats;
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79 enum PixelFormat pix_fmt;
80 int ret;
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81
82 if (ctx->inputs[0]) {
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83 formats = NULL;
84 for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
85 if ( sws_isSupportedInput(pix_fmt)
bdab614b 86 && (ret = avfilter_add_format(&formats, pix_fmt)) < 0) {
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87 avfilter_formats_unref(&formats);
88 return ret;
89 }
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90 avfilter_formats_ref(formats, &ctx->inputs[0]->out_formats);
91 }
92 if (ctx->outputs[0]) {
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93 formats = NULL;
94 for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
95 if ( sws_isSupportedOutput(pix_fmt)
bdab614b 96 && (ret = avfilter_add_format(&formats, pix_fmt)) < 0) {
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97 avfilter_formats_unref(&formats);
98 return ret;
99 }
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100 avfilter_formats_ref(formats, &ctx->outputs[0]->in_formats);
101 }
102
103 return 0;
104}
105
106static int config_props(AVFilterLink *outlink)
107{
108 AVFilterContext *ctx = outlink->src;
109 AVFilterLink *inlink = outlink->src->inputs[0];
110 ScaleContext *scale = ctx->priv;
111 int64_t w, h;
112
113 if (!(w = scale->w))
114 w = inlink->w;
115 if (!(h = scale->h))
116 h = inlink->h;
117 if (w == -1)
118 w = av_rescale(h, inlink->w, inlink->h);
119 if (h == -1)
120 h = av_rescale(w, inlink->h, inlink->w);
121
122 if (w > INT_MAX || h > INT_MAX ||
123 (h * inlink->w) > INT_MAX ||
124 (w * inlink->h) > INT_MAX)
125 av_log(ctx, AV_LOG_ERROR, "Rescaled value for width or height is too big.\n");
126
127 outlink->w = w;
128 outlink->h = h;
129
130 /* TODO: make algorithm configurable */
47f0704e 131 av_log(ctx, AV_LOG_INFO, "w:%d h:%d fmt:%s -> w:%d h:%d fmt:%s flags:0x%0x\n",
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132 inlink ->w, inlink ->h, av_pix_fmt_descriptors[ inlink->format].name,
133 outlink->w, outlink->h, av_pix_fmt_descriptors[outlink->format].name,
134 scale->flags);
c3eabb7d 135
d2a2b08c 136 scale->input_is_pal = av_pix_fmt_descriptors[inlink->format].flags & PIX_FMT_PAL;
c3eabb7d 137
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138 scale->sws = sws_getContext(inlink ->w, inlink ->h, inlink ->format,
139 outlink->w, outlink->h, outlink->format,
140 scale->flags, NULL, NULL, NULL);
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141 if (!scale->sws)
142 return AVERROR(EINVAL);
d760a316 143
dccdd93e 144 return 0;
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145}
146
ecc8dada 147static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
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148{
149 ScaleContext *scale = link->dst->priv;
150 AVFilterLink *outlink = link->dst->outputs[0];
ecc8dada 151 AVFilterBufferRef *outpicref;
c3eabb7d 152
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153 scale->hsub = av_pix_fmt_descriptors[link->format].log2_chroma_w;
154 scale->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
b37aa4de 155
c3eabb7d 156 outpicref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
7fce481a 157 avfilter_copy_buffer_ref_props(outpicref, picref);
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158 outpicref->video->w = outlink->w;
159 outpicref->video->h = outlink->h;
efdc74ef 160
5d4890d7 161 outlink->out_buf = outpicref;
c3eabb7d 162
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163 av_reduce(&outpicref->video->pixel_aspect.num, &outpicref->video->pixel_aspect.den,
164 (int64_t)picref->video->pixel_aspect.num * outlink->h * link->w,
165 (int64_t)picref->video->pixel_aspect.den * outlink->w * link->h,
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166 INT_MAX);
167
a13a5437 168 scale->slice_y = 0;
7fce481a 169 avfilter_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
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170}
171
a13a5437 172static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
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173{
174 ScaleContext *scale = link->dst->priv;
175 int out_h;
5d4890d7 176 AVFilterBufferRef *cur_pic = link->cur_buf;
93f7aeb5 177 const uint8_t *data[4];
c3eabb7d 178
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179 if (scale->slice_y == 0 && slice_dir == -1)
180 scale->slice_y = link->dst->outputs[0]->h;
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181
182 data[0] = cur_pic->data[0] + y * cur_pic->linesize[0];
183 data[1] = scale->input_is_pal ?
184 cur_pic->data[1] :
185 cur_pic->data[1] + (y>>scale->vsub) * cur_pic->linesize[1];
186 data[2] = cur_pic->data[2] + (y>>scale->vsub) * cur_pic->linesize[2];
187 data[3] = cur_pic->data[3] + y * cur_pic->linesize[3];
188
189 out_h = sws_scale(scale->sws, data, cur_pic->linesize, y, h,
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190 link->dst->outputs[0]->out_buf->data,
191 link->dst->outputs[0]->out_buf->linesize);
c3eabb7d 192
a13a5437 193 if (slice_dir == -1)
c3eabb7d 194 scale->slice_y -= out_h;
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195 avfilter_draw_slice(link->dst->outputs[0], scale->slice_y, out_h, slice_dir);
196 if (slice_dir == 1)
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197 scale->slice_y += out_h;
198}
199
200AVFilter avfilter_vf_scale = {
201 .name = "scale",
a6881c6a 202 .description = NULL_IF_CONFIG_SMALL("Scale the input video to width:height size and/or convert the image format."),
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203
204 .init = init,
205 .uninit = uninit,
206
207 .query_formats = query_formats,
208
209 .priv_size = sizeof(ScaleContext),
210
211 .inputs = (AVFilterPad[]) {{ .name = "default",
72415b2a 212 .type = AVMEDIA_TYPE_VIDEO,
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213 .start_frame = start_frame,
214 .draw_slice = draw_slice,
215 .min_perms = AV_PERM_READ, },
216 { .name = NULL}},
217 .outputs = (AVFilterPad[]) {{ .name = "default",
72415b2a 218 .type = AVMEDIA_TYPE_VIDEO,
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219 .config_props = config_props, },
220 { .name = NULL}},
221};