main.c

/* Modified: by ckevar on Dec 27, 2019, 12:26 PM
 *
 * File:   main.c
 * Author: tas
 *
 * Created on May 22, 2013, 1:52 PM
 */

#include <stdio.h>
#include <stdlib.h>

#include "bcm_host.h"
#include "interface/vcos/vcos.h"

#include "interface/mmal/mmal.h"
#include "interface/mmal/util/mmal_default_components.h"
#include "interface/mmal/util/mmal_connection.h"

#define MMAL_CAMERA_PREVIEW_PORT 0
#define MMAL_CAMERA_VIDEO_PORT 1
#define MMAL_CAMERA_CAPTURE_PORT 2

int main(int argc, char** argv) {
    MMAL_COMPONENT_T *camera = 0;
    MMAL_COMPONENT_T *preview = 0;
    MMAL_ES_FORMAT_T *format;
    MMAL_STATUS_T status;
    MMAL_PORT_T *camera_preview_port = NULL, *camera_video_port = NULL, *camera_still_port = NULL;
    MMAL_PORT_T *preview_input_port = NULL;

    MMAL_CONNECTION_T *camera_preview_connection = 0;

    printf("Running...\n");


    bcm_host_init();

    status = mmal_component_create(MMAL_COMPONENT_DEFAULT_CAMERA, &camera);
    if (status != MMAL_SUCCESS) {
        printf("Error: create camera %x\n", status);
        return -1;
    }

    camera_preview_port = camera->output[MMAL_CAMERA_PREVIEW_PORT];
    camera_video_port = camera->output[MMAL_CAMERA_VIDEO_PORT];
    camera_still_port = camera->output[MMAL_CAMERA_CAPTURE_PORT];

    {
        MMAL_PARAMETER_CAMERA_CONFIG_T cam_config = {
            { MMAL_PARAMETER_CAMERA_CONFIG, sizeof (cam_config)},
            .max_stills_w = 1280,
            .max_stills_h = 720,
            .stills_yuv422 = 0,
            .one_shot_stills = 1,
            .max_preview_video_w = 1280,
            .max_preview_video_h = 720,
            .num_preview_video_frames = 3,
            .stills_capture_circular_buffer_height = 0,
            .fast_preview_resume = 0,
            .use_stc_timestamp = MMAL_PARAM_TIMESTAMP_MODE_RESET_STC
        };
        mmal_port_parameter_set(camera->control, &cam_config.hdr);
    }

    format = camera_preview_port->format;

    format->encoding = MMAL_ENCODING_OPAQUE;
    format->encoding_variant = MMAL_ENCODING_I420;

    format->es->video.width = 1280;
    format->es->video.height = 720;
    format->es->video.crop.x = 0;
    format->es->video.crop.y = 0;
    format->es->video.crop.width = 1280;
    format->es->video.crop.height = 720;

    status = mmal_port_format_commit(camera_preview_port);

    if (status != MMAL_SUCCESS) {
        printf("Error: camera viewfinder format couldn't be set\n");
        return -1;
    }

    status = mmal_component_enable(camera);

    status = mmal_component_create(MMAL_COMPONENT_DEFAULT_VIDEO_RENDERER, &preview);
    if (status != MMAL_SUCCESS) {
        printf("Error: unable to create preview (%u)\n", status);
        return -1;
    }
    preview_input_port = preview->input[0];

    {
        MMAL_DISPLAYREGION_T param;
        param.hdr.id = MMAL_PARAMETER_DISPLAYREGION;
        param.hdr.size = sizeof (MMAL_DISPLAYREGION_T);
        param.set = MMAL_DISPLAY_SET_LAYER;
        param.layer = 0;
        param.set |= MMAL_DISPLAY_SET_FULLSCREEN;
        param.fullscreen = 1;
        status = mmal_port_parameter_set(preview_input_port, &param.hdr);
        if (status != MMAL_SUCCESS && status != MMAL_ENOSYS) {
            printf("Error: unable to set preview port parameters (%u)\n", status);
            return -1;
        }
    }

    status = mmal_connection_create(&camera_preview_connection, camera_preview_port, preview_input_port, MMAL_CONNECTION_FLAG_TUNNELLING | MMAL_CONNECTION_FLAG_ALLOCATION_ON_INPUT);
    if (status != MMAL_SUCCESS) {
        printf("Error: unable to create connection (%u)\n", status);
        return -1;
    }

    status = mmal_connection_enable(camera_preview_connection);
    if (status != MMAL_SUCCESS) {
        printf("Error: unable to enable connection (%u)\n", status);
        return -1;
    }
    
    while (1);

    return 0;
}