Ticket #7245: video_scale.cpp

/*
* 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
*/
extern "C" {
#ifdef __cplusplus
#define __STDC_CONSTANT_MACROS

#endif


#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 = 1920, src_h = 1080, dst_w, dst_h;
    enum AVPixelFormat src_pix_fmt = AV_PIX_FMT_NV12, dst_pix_fmt = AV_PIX_FMT_NV12;
    const char *dst_size = NULL;
    const char *dst_filename = NULL;
    const char *src_filename = NULL;
    FILE *dst_file,*src_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 = "output.yuv";
    src_filename = "input.yuv";
    dst_size = "1920x1080";

    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");
    src_file = fopen(src_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 < 1; 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(src_data[0], 1, dst_bufsize, src_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);
    fclose(src_file);
    av_freep(&src_data[0]);
    av_freep(&dst_data[0]);
    sws_freeContext(sws_ctx);
    return ret < 0;
}