vf_split.cpp

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#ifdef HAVE_CONFIG_H
#include "config.h"
#include "config_unix.h"
#include "config_win32.h"
#endif // HAVE_CONFIG_H
 
#include <stdio.h>
#include <string.h>
#include "utils/vf_split.h"
#include "video.h"
#include "video_codec.h"
 
void vf_split(struct video_frame *out, struct video_frame *src,
              unsigned int x_count, unsigned int y_count, int preallocate)
{
        unsigned int        tile_idx, line_idx;
        struct tile        *cur_tiles;
        unsigned int        tile_line = 0;
        int                 out_linesize = 0;
        int                 src_linesize;
 
        out->color_spec = src->color_spec;
        out->fps = src->fps;
        //out->aux = src->aux | AUX_TILED;
 
        assert(vf_get_tile(src, 0)->width % x_count == 0u && vf_get_tile(src, 0)->height % y_count == 0u);
 
        src_linesize = vc_get_linesize(src->tiles[0].width,
                        src->color_spec);
 
        assert(x_count * y_count > 0);
        for(tile_idx = 0u; tile_idx < x_count * y_count; ++tile_idx) {
                out->tiles[tile_idx].width = vf_get_tile(src, 0)->width / x_count;
                out->tiles[tile_idx].height = vf_get_tile(src, 0)->height / y_count;
 
                out_linesize = vc_get_linesize(out->tiles[tile_idx].width,
                                src->color_spec);
                out->tiles[tile_idx].data_len = out_linesize * out->tiles[tile_idx].height;
        }
 
        cur_tiles = &out->tiles[0];
        for(line_idx = 0u; line_idx < vf_get_tile(src, 0)->height; ++line_idx, ++tile_line) {
                unsigned int cur_tile_idx;
                unsigned int byte = 0u;
 
                if (line_idx % (vf_get_tile(src, 0)->height / y_count) == 0u) /* next tiles*/
                {
                        tile_line = 0u;
                        if (line_idx != 0u)
                                cur_tiles += x_count;
                        if (preallocate) {
                                for (cur_tile_idx = 0u; cur_tile_idx < x_count;
                                               ++cur_tile_idx) {
                                        cur_tiles[cur_tile_idx].data = (char *)
                                                malloc(cur_tiles[cur_tile_idx].
                                                                data_len);
                                }
                        }
                }
 
                for(cur_tile_idx = 0u; cur_tile_idx < x_count; ++cur_tile_idx) {
                        memcpy((void *) &cur_tiles[cur_tile_idx].data[
                                        tile_line *
                                        out_linesize],
                                        (void *) &src->tiles[0].data[line_idx *
                                        src_linesize + byte],
                                        cur_tiles[cur_tile_idx].width *
                                        get_bpp(src->color_spec));
                        byte += cur_tiles[cur_tile_idx].width * get_bpp(src->color_spec);
                }
        }
}
 
using namespace std;
 
vector<shared_ptr<video_frame>> vf_separate_tiles(shared_ptr<video_frame> frame)
{
        vector<shared_ptr<video_frame>> ret(frame->tile_count);
        struct video_desc desc = video_desc_from_frame(frame.get());
        desc.tile_count = 1;
 
        for (unsigned int i = 0; i < frame->tile_count; ++i) {
                auto holder = new shared_ptr<video_frame>(frame);
                ret[i] = shared_ptr<video_frame>(vf_alloc_desc(desc), [holder](struct video_frame *frame) {
                        delete holder;
                        vf_free(frame);
                });
 
                ret[i]->tiles[0].data_len = frame->tiles[i].data_len;
                ret[i]->tiles[0].data = frame->tiles[i].data;
                vf_copy_metadata(ret[i].get(), frame.get());
        }
 
        return ret;
}
 
shared_ptr<video_frame> vf_merge_tiles(std::vector<shared_ptr<video_frame>> const & tiles)
{
        struct video_desc desc = video_desc_from_frame(tiles[0].get());
        desc.tile_count = tiles.size();
 
        auto holder = new decay<decltype(tiles)>::type(tiles);
        shared_ptr<video_frame> ret(vf_alloc_desc(desc),
                        [holder](struct video_frame *frame) {
                                delete holder;
                                vf_free(frame);
                        });
 
        int64_t t0 = INT64_MAX;
        int64_t t1 = 0;
        for (unsigned int i = 0; i < tiles.size(); ++i) {
                ret->tiles[i].data = tiles[i]->tiles[0].data;
                ret->tiles[i].data_len = tiles[i]->tiles[0].data_len;
                t0 = tiles[i]->compress_start < t0 ? tiles[i]->compress_start : t0;
                t1 = tiles[i]->compress_end > t1 ? tiles[i]->compress_end : t1;
        }
        vf_copy_metadata(ret.get(), tiles.at(0).get());
        ret->compress_start = t0;
        ret->compress_end = t1;
 
        return ret;
}