interlace.c

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/*
 * Copyright (c) 2012-2023 CESNET, z. s. p. o.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of CESNET nor the names of its contributors may be
 *    used to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#include "config_unix.h"
#include "config_win32.h"
#endif
#include "debug.h"
 
#include <pthread.h>
#include <stdlib.h>
#include "lib_common.h"
#include "video.h"
#include "video_display.h"
#include "vo_postprocess.h"
 
enum last_frame {
        ODD = 0,
        EVEN = 1
};
 
struct state_interlace {
        struct video_frame *odd,
                           *even;
 
        enum last_frame last;
};
 
static void usage()
{
        printf("-p interlace\n");
}
 
static void * interlace_init(const char *config) {
        if (strcmp(config, "help") == 0) {
                usage();
                return NULL;
        }
 
        struct state_interlace *s = (struct state_interlace *)
                malloc(sizeof(struct state_interlace));
 
        assert(s != NULL);
        s->odd = NULL;
        s->even = NULL;
        s->last = EVEN; // next one will be od
        
        return s;
}
 
static bool interlace_get_property(void *state, int property, void *val, size_t *len)
{
        UNUSED(state);
        UNUSED(property);
        UNUSED(val);
        UNUSED(len);
 
        return false;
}
 
static bool
interlace_reconfigure(void *state, struct video_desc desc)
{
        struct state_interlace *s = (struct state_interlace *) state;
 
        vf_free(s->odd);
        vf_free(s->even);
        s->odd = vf_alloc_desc_data(desc);
        s->even = vf_alloc_desc_data(desc);
 
        s->last = EVEN;
 
        return true;
}
 
static struct video_frame * interlace_getf(void *state)
{
        struct state_interlace *s = (struct state_interlace *) state;
        struct video_frame *ret;
 
        if((s->last + 1) % 2 == 0) {
                ret = s->odd;
        } else {
                ret = s->even;
        }
 
        s->last = (s->last + 1) % 2;
 
        return ret;
}
 
static bool interlace_postprocess(void *state, struct video_frame *in, struct video_frame *out, int req_pitch)
{
        struct state_interlace *s = (struct state_interlace *) state;
 
        UNUSED(in); // we know which frame it is
 
        if(s->last == ODD) {
                return false;
        }
 
        int linesize = vc_get_linesize(s->odd->tiles[0].width, s->odd->color_spec);
        for(unsigned int tile = 0; tile < out->tile_count; ++tile) {
                for (unsigned int i = 0; i < out->tiles[0].height; ++i) {
                        memcpy(out->tiles[tile].data + i * req_pitch,
                                        (i % 2 == 0 ?
                                         s->odd->tiles[tile].data :
                                         s->even->tiles[tile].data) 
                                        + i * linesize, linesize);
                }
        }
 
        return true;
}
 
static void interlace_done(void *state)
{
        struct state_interlace *s = (struct state_interlace *) state;
        
        vf_free(s->odd);
        vf_free(s->even);
 
        free(state);
}
 
static void interlace_get_out_desc(void *state, struct video_desc *out, int *in_display_mode, int *out_frames)
{
        struct state_interlace *s = (struct state_interlace *) state;
 
        out->width = vf_get_tile(s->odd, 0)->width;
        out->height = vf_get_tile(s->odd, 0)->height;
        out->color_spec = s->odd->color_spec;
        out->interlacing = INTERLACED_MERGED;
        out->fps = s->odd->fps / 2.0;
        out->tile_count = s->odd->tile_count;
 
        UNUSED(in_display_mode);
        //*in_display_mode = DISPLAY_PROPERTY_VIDEO_MERGED;
        *out_frames = 1;
}
 
static const struct vo_postprocess_info vo_pp_interlace_info = {
        interlace_init,
        interlace_reconfigure,
        interlace_getf,
        interlace_get_out_desc,
        interlace_get_property,
        interlace_postprocess,
        interlace_done,
};
 
REGISTER_MODULE(interlace, &vo_pp_interlace_info, LIBRARY_CLASS_VIDEO_POSTPROCESS, VO_PP_ABI_VERSION);