| /* |
| * Copyright (c) 2012 Stefano Sabatini |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| /** |
| * @file |
| * libswscale API use example. |
| * @example scaling_video.c |
| */ |
| |
| #include <libavutil/imgutils.h> |
| #include <libavutil/parseutils.h> |
| #include <libswscale/swscale.h> |
| |
| static void fill_yuv_image(uint8_t *data[4], int linesize[4], |
| int width, int height, int frame_index) |
| { |
| int x, y; |
| |
| /* Y */ |
| for (y = 0; y < height; y++) |
| for (x = 0; x < width; x++) |
| data[0][y * linesize[0] + x] = x + y + frame_index * 3; |
| |
| /* Cb and Cr */ |
| for (y = 0; y < height / 2; y++) { |
| for (x = 0; x < width / 2; x++) { |
| data[1][y * linesize[1] + x] = 128 + y + frame_index * 2; |
| data[2][y * linesize[2] + x] = 64 + x + frame_index * 5; |
| } |
| } |
| } |
| |
| int main(int argc, char **argv) |
| { |
| uint8_t *src_data[4], *dst_data[4]; |
| int src_linesize[4], dst_linesize[4]; |
| int src_w = 320, src_h = 240, dst_w, dst_h; |
| enum AVPixelFormat src_pix_fmt = AV_PIX_FMT_YUV420P, dst_pix_fmt = AV_PIX_FMT_RGB24; |
| const char *dst_size = NULL; |
| const char *dst_filename = NULL; |
| FILE *dst_file; |
| int dst_bufsize; |
| struct SwsContext *sws_ctx; |
| int i, ret; |
| |
| if (argc != 3) { |
| fprintf(stderr, "Usage: %s output_file output_size\n" |
| "API example program to show how to scale an image with libswscale.\n" |
| "This program generates a series of pictures, rescales them to the given " |
| "output_size and saves them to an output file named output_file\n." |
| "\n", argv[0]); |
| exit(1); |
| } |
| dst_filename = argv[1]; |
| dst_size = argv[2]; |
| |
| if (av_parse_video_size(&dst_w, &dst_h, dst_size) < 0) { |
| fprintf(stderr, |
| "Invalid size '%s', must be in the form WxH or a valid size abbreviation\n", |
| dst_size); |
| exit(1); |
| } |
| |
| dst_file = fopen(dst_filename, "wb"); |
| if (!dst_file) { |
| fprintf(stderr, "Could not open destination file %s\n", dst_filename); |
| exit(1); |
| } |
| |
| /* create scaling context */ |
| sws_ctx = sws_getContext(src_w, src_h, src_pix_fmt, |
| dst_w, dst_h, dst_pix_fmt, |
| SWS_BILINEAR, NULL, NULL, NULL); |
| if (!sws_ctx) { |
| fprintf(stderr, |
| "Impossible to create scale context for the conversion " |
| "fmt:%s s:%dx%d -> fmt:%s s:%dx%d\n", |
| av_get_pix_fmt_name(src_pix_fmt), src_w, src_h, |
| av_get_pix_fmt_name(dst_pix_fmt), dst_w, dst_h); |
| ret = AVERROR(EINVAL); |
| goto end; |
| } |
| |
| /* allocate source and destination image buffers */ |
| if ((ret = av_image_alloc(src_data, src_linesize, |
| src_w, src_h, src_pix_fmt, 16)) < 0) { |
| fprintf(stderr, "Could not allocate source image\n"); |
| goto end; |
| } |
| |
| /* buffer is going to be written to rawvideo file, no alignment */ |
| if ((ret = av_image_alloc(dst_data, dst_linesize, |
| dst_w, dst_h, dst_pix_fmt, 1)) < 0) { |
| fprintf(stderr, "Could not allocate destination image\n"); |
| goto end; |
| } |
| dst_bufsize = ret; |
| |
| for (i = 0; i < 100; i++) { |
| /* generate synthetic video */ |
| fill_yuv_image(src_data, src_linesize, src_w, src_h, i); |
| |
| /* convert to destination format */ |
| sws_scale(sws_ctx, (const uint8_t * const*)src_data, |
| src_linesize, 0, src_h, dst_data, dst_linesize); |
| |
| /* write scaled image to file */ |
| fwrite(dst_data[0], 1, dst_bufsize, dst_file); |
| } |
| |
| fprintf(stderr, "Scaling succeeded. Play the output file with the command:\n" |
| "ffplay -f rawvideo -pix_fmt %s -video_size %dx%d %s\n", |
| av_get_pix_fmt_name(dst_pix_fmt), dst_w, dst_h, dst_filename); |
| |
| end: |
| fclose(dst_file); |
| av_freep(&src_data[0]); |
| av_freep(&dst_data[0]); |
| sws_freeContext(sws_ctx); |
| return ret < 0; |
| } |