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1 | /* |
2 | * Copyright (c) 2012 Stefano Sabatini | |
3 | * | |
4 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
5 | * of this software and associated documentation files (the "Software"), to deal | |
6 | * in the Software without restriction, including without limitation the rights | |
7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
8 | * copies of the Software, and to permit persons to whom the Software is | |
9 | * furnished to do so, subject to the following conditions: | |
10 | * | |
11 | * The above copyright notice and this permission notice shall be included in | |
12 | * all copies or substantial portions of the Software. | |
13 | * | |
14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
17 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
20 | * THE SOFTWARE. | |
21 | */ | |
22 | ||
23 | /** | |
24 | * @file | |
25 | * libswscale API use example. | |
26 | * @example scaling_video.c | |
27 | */ | |
28 | ||
29 | #include <libavutil/imgutils.h> | |
30 | #include <libavutil/parseutils.h> | |
31 | #include <libswscale/swscale.h> | |
32 | ||
33 | static void fill_yuv_image(uint8_t *data[4], int linesize[4], | |
34 | int width, int height, int frame_index) | |
35 | { | |
36 | int x, y; | |
37 | ||
38 | /* Y */ | |
39 | for (y = 0; y < height; y++) | |
40 | for (x = 0; x < width; x++) | |
41 | data[0][y * linesize[0] + x] = x + y + frame_index * 3; | |
42 | ||
43 | /* Cb and Cr */ | |
44 | for (y = 0; y < height / 2; y++) { | |
45 | for (x = 0; x < width / 2; x++) { | |
46 | data[1][y * linesize[1] + x] = 128 + y + frame_index * 2; | |
47 | data[2][y * linesize[2] + x] = 64 + x + frame_index * 5; | |
48 | } | |
49 | } | |
50 | } | |
51 | ||
52 | int main(int argc, char **argv) | |
53 | { | |
54 | uint8_t *src_data[4], *dst_data[4]; | |
55 | int src_linesize[4], dst_linesize[4]; | |
56 | int src_w = 320, src_h = 240, dst_w, dst_h; | |
57 | enum AVPixelFormat src_pix_fmt = AV_PIX_FMT_YUV420P, dst_pix_fmt = AV_PIX_FMT_RGB24; | |
58 | const char *dst_size = NULL; | |
59 | const char *dst_filename = NULL; | |
60 | FILE *dst_file; | |
61 | int dst_bufsize; | |
62 | struct SwsContext *sws_ctx; | |
63 | int i, ret; | |
64 | ||
65 | if (argc != 3) { | |
66 | fprintf(stderr, "Usage: %s output_file output_size\n" | |
67 | "API example program to show how to scale an image with libswscale.\n" | |
68 | "This program generates a series of pictures, rescales them to the given " | |
69 | "output_size and saves them to an output file named output_file\n." | |
70 | "\n", argv[0]); | |
71 | exit(1); | |
72 | } | |
73 | dst_filename = argv[1]; | |
74 | dst_size = argv[2]; | |
75 | ||
76 | if (av_parse_video_size(&dst_w, &dst_h, dst_size) < 0) { | |
77 | fprintf(stderr, | |
78 | "Invalid size '%s', must be in the form WxH or a valid size abbreviation\n", | |
79 | dst_size); | |
80 | exit(1); | |
81 | } | |
82 | ||
83 | dst_file = fopen(dst_filename, "wb"); | |
84 | if (!dst_file) { | |
85 | fprintf(stderr, "Could not open destination file %s\n", dst_filename); | |
86 | exit(1); | |
87 | } | |
88 | ||
89 | /* create scaling context */ | |
90 | sws_ctx = sws_getContext(src_w, src_h, src_pix_fmt, | |
91 | dst_w, dst_h, dst_pix_fmt, | |
92 | SWS_BILINEAR, NULL, NULL, NULL); | |
93 | if (!sws_ctx) { | |
94 | fprintf(stderr, | |
95 | "Impossible to create scale context for the conversion " | |
96 | "fmt:%s s:%dx%d -> fmt:%s s:%dx%d\n", | |
97 | av_get_pix_fmt_name(src_pix_fmt), src_w, src_h, | |
98 | av_get_pix_fmt_name(dst_pix_fmt), dst_w, dst_h); | |
99 | ret = AVERROR(EINVAL); | |
100 | goto end; | |
101 | } | |
102 | ||
103 | /* allocate source and destination image buffers */ | |
104 | if ((ret = av_image_alloc(src_data, src_linesize, | |
105 | src_w, src_h, src_pix_fmt, 16)) < 0) { | |
106 | fprintf(stderr, "Could not allocate source image\n"); | |
107 | goto end; | |
108 | } | |
109 | ||
110 | /* buffer is going to be written to rawvideo file, no alignment */ | |
111 | if ((ret = av_image_alloc(dst_data, dst_linesize, | |
112 | dst_w, dst_h, dst_pix_fmt, 1)) < 0) { | |
113 | fprintf(stderr, "Could not allocate destination image\n"); | |
114 | goto end; | |
115 | } | |
116 | dst_bufsize = ret; | |
117 | ||
118 | for (i = 0; i < 100; i++) { | |
119 | /* generate synthetic video */ | |
120 | fill_yuv_image(src_data, src_linesize, src_w, src_h, i); | |
121 | ||
122 | /* convert to destination format */ | |
123 | sws_scale(sws_ctx, (const uint8_t * const*)src_data, | |
124 | src_linesize, 0, src_h, dst_data, dst_linesize); | |
125 | ||
126 | /* write scaled image to file */ | |
127 | fwrite(dst_data[0], 1, dst_bufsize, dst_file); | |
128 | } | |
129 | ||
130 | fprintf(stderr, "Scaling succeeded. Play the output file with the command:\n" | |
131 | "ffplay -f rawvideo -pix_fmt %s -video_size %dx%d %s\n", | |
132 | av_get_pix_fmt_name(dst_pix_fmt), dst_w, dst_h, dst_filename); | |
133 | ||
134 | end: | |
135 | fclose(dst_file); | |
136 | av_freep(&src_data[0]); | |
137 | av_freep(&dst_data[0]); | |
138 | sws_freeContext(sws_ctx); | |
139 | return ret < 0; | |
140 | } |