null.c

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/*
 * FILE:   video_display/null.c
 * AUTHOR: Colin Perkins <csp@isi.edu>
 *
 * Copyright (c) 2001-2003 University of Southern California
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 * 
 *      This product includes software developed by the University of Southern
 *      California Information Sciences Institute.
 * 
 * 4. Neither the name of the University nor of the Institute 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.
 *
 * $Revision: 1.1 $
 * $Date: 2007/11/08 09:48:59 $
 *
 */
 
#include "config.h"
#include "config_unix.h"
#include "config_win32.h"
#include "debug.h"
#include "lib_common.h"
#include "video.h"
#include "video_display.h"
 
#define MAGIC_NULL      0x17bad83f
 
struct state_null {
        uint32_t magic;
};
 
static void display_null_probe(struct device_info **available_cards, int *count, void (**deleter)(void *))
{
        UNUSED(deleter);
        *available_cards = NULL;
        *count = 0;
}
 
static void *display_null_init(struct module *parent, const char *fmt, unsigned int flags)
{
        UNUSED(fmt);
        UNUSED(flags);
        UNUSED(parent);
        struct state_null *s;
 
        s = (struct state_null *)calloc(1, sizeof(struct state_null));
        if (s != NULL) {
                s->magic = MAGIC_NULL;
        }
        return s;
}
 
static void display_null_done(void *state)
{
        struct state_null *s = (struct state_null *)state;
        assert(s->magic == MAGIC_NULL);
        free(s);
}
 
static struct video_frame *display_null_getf(void *state)
{
        struct state_null *s = (struct state_null *)state;
        assert(s->magic == MAGIC_NULL);
        return NULL;
}
 
static bool display_null_putf(void *state, struct video_frame *frame, long long nonblock)
{
        struct state_null *s = (struct state_null *)state;
        assert(s->magic == MAGIC_NULL);
        UNUSED(frame);
        UNUSED(nonblock);
        return true;
}
 
static bool display_null_get_property(void *state, int property, void *val, size_t *len)
{
        UNUSED(state);
        UNUSED(property);
        UNUSED(val);
        UNUSED(len);
        
        return false;
}
 
static bool display_null_reconfigure(void *state, struct video_desc desc)
{
        UNUSED(desc);
        struct state_null *s = (struct state_null *)state;
        assert(s->magic == MAGIC_NULL);
 
        return true;
}
 
static void display_null_put_audio_frame(void *state, const struct audio_frame *frame)
{
        UNUSED(state);
        UNUSED(frame);
}
 
static bool display_null_reconfigure_audio(void *state, int quant_samples, int channels,
                int sample_rate)
{
        UNUSED(state);
        UNUSED(quant_samples);
        UNUSED(channels);
        UNUSED(sample_rate);
 
        return false;
}
 
static const struct video_display_info display_null_info = {
        display_null_probe,
        display_null_init,
        NULL, // _run
        display_null_done,
        display_null_getf,
        display_null_putf,
        display_null_reconfigure,
        display_null_get_property,
        display_null_put_audio_frame,
        display_null_reconfigure_audio,
        DISPLAY_NO_GENERIC_FPS_INDICATOR,
};
 
REGISTER_HIDDEN_MODULE(none, &display_null_info, LIBRARY_CLASS_VIDEO_DISPLAY, VIDEO_DISPLAY_ABI_VERSION);