#include "config.h"
 
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dlfcn.h>
#include <poll.h>
#include <pthread.h>
#include <errno.h>
#include <sys/mman.h>
 
#include <SDL2/SDL.h>
 
#include <spa/param/video/format-utils.h>
 
#define WIDTH   640
#define HEIGHT  480
 
 
#define MAX_BUFFERS     8
#define LOOP_TIMEOUT_MS 100
#define USE_BUFFER              false
 
struct buffer {
        SDL_Texture *texture;
};
 
struct data {
        const char *plugin_dir;
 
        uint32_t n_support;
 
 
        SDL_Renderer *renderer;
        SDL_Window *window;
        SDL_Texture *texture;
 
        bool use_buffer;
 
        bool running;
        pthread_t thread;
 
        struct buffer buffers[MAX_BUFFERS];
        unsigned int n_buffers;
};
 
static int load_handle(
struct data *data, 
struct spa_handle **handle, 
const char *lib, 
const char *name)
 
{
        void *hnd;
        uint32_t i;
 
        char *path = NULL;
 
        if ((path = 
spa_aprintf(
"%s/%s", data->plugin_dir, lib)) == NULL) {
 
                return -ENOMEM;
        }
        if ((hnd = dlopen(path, RTLD_NOW)) == NULL) {
                printf("can't load %s: %s\n", path, dlerror());
                free(path);
                return -errno;
        }
        free(path);
                printf("can't find enum function\n");
                return -errno;
        }
 
        for (i = 0;;) {
 
                if ((
res = enum_func(&factory, &i)) <= 0) {
 
                        break;
                }
                        continue;
 
                                                NULL, data->support,
                                                data->n_support)) < 0) {
                        printf(
"can't make factory instance: %d\n", 
res);
                }
                return 0;
        }
        return -EBADF;
}
 
static int make_node(
struct data *data, 
struct spa_node **node, 
const char *lib, 
const char *name)
 
{
        void *iface;
 
        if ((
res = load_handle(data, &handle, lib, name)) < 0)
 
 
                printf(
"can't get interface %d\n", 
res);
        }
        *node = iface;
        return 0;
}
 
static int on_source_ready(void *_data, int status)
{
        struct data *data = _data;
        struct buffer *b;
        void *sdata, *ddata;
        int sstride, dstride;
        int i;
        uint8_t *src, *dst;
 
                return -EINVAL;
 
 
        datas = b->buffer.datas;
 
        if (b->texture) {
                SDL_Texture *texture = b->texture;
 
                SDL_UnlockTexture(texture);
 
                SDL_RenderClear(data->renderer);
                SDL_RenderCopy(data->renderer, texture, NULL, NULL);
                SDL_RenderPresent(data->renderer);
 
                if (SDL_LockTexture(texture, NULL, &sdata, &sstride) < 0) {
                        fprintf(stderr, "Couldn't lock texture: %s\n", SDL_GetError());
                        return -EIO;
                }
        } else {
                uint8_t *map;
 
                if (SDL_LockTexture(data->texture, NULL, &ddata, &dstride) < 0) {
                        fprintf(stderr, "Couldn't lock texture: %s\n", SDL_GetError());
                        return -EIO;
                }
                        map = mmap(NULL, datas[0].maxsize, PROT_READ,
                                   MAP_PRIVATE, datas[0].fd, datas[0].mapoffset);
                        if (map == MAP_FAILED)
                                return -errno;
                        sdata = map;
                        map = NULL;
                } else
                        return -EIO;
 
 
                for (i = 0; i < HEIGHT; i++) {
                        src = ((uint8_t *) sdata + i * sstride);
                        dst = ((uint8_t *) ddata + i * dstride);
                        memcpy(dst, src, 
SPA_MIN(sstride, dstride));
                }
                SDL_UnlockTexture(data->texture);
 
                SDL_RenderClear(data->renderer);
                SDL_RenderCopy(data->renderer, data->texture, NULL, NULL);
                SDL_RenderPresent(data->renderer);
 
                if (map)
                        munmap(map, datas[0].maxsize);
        }
 
                printf(
"got process error %d\n", 
res);
 
        return 0;
}
 
        .ready = on_source_ready,
};
 
static int make_nodes(struct data *data, const char *device)
{
        uint8_t buffer[256];
        uint32_t index;
 
             make_node(data, &data->source,
                     "libcamera/libspa-libcamera.so",
                printf(
"can't create libcamera-source: %d\n", 
res);
        }
 
 
        index = 0;
                        &index, NULL, &props, &b)) == 1) {
        }
 
 
                printf(
"got set_props error %d\n", 
res);
 
}
 
static int setup_buffers(struct data *data)
{
        int i;
 
        for (i = 0; i < MAX_BUFFERS; i++) {
                struct buffer *b = &data->buffers[i];
 
                data->bp[i] = &b->buffer;
 
                b->texture = NULL;
 
                b->buffer.metas = b->metas;
                b->buffer.n_metas = 1;
                b->buffer.datas = b->datas;
                b->buffer.n_datas = 1;
 
                b->header.seq = 0;
                b->header.pts = 0;
                b->header.dts_offset = 0;
                b->metas[0].data = &b->header;
                b->metas[0].size = sizeof(b->header);
 
                b->datas[0].flags = 0;
                b->datas[0].fd = -1;
                b->datas[0].mapoffset = 0;
                b->datas[0].maxsize = 0;
                b->datas[0].data = NULL;
                b->datas[0].chunk = &b->chunks[0];
                b->datas[0].chunk->offset = 0;
                b->datas[0].chunk->size = 0;
                b->datas[0].chunk->stride = 0;
        }
        data->n_buffers = MAX_BUFFERS;
        return 0;
}
 
static int sdl_alloc_buffers(struct data *data)
{
        int i;
 
        for (i = 0; i < MAX_BUFFERS; i++) {
                struct buffer *b = &data->buffers[i];
                SDL_Texture *texture;
                void *ptr;
                int stride;
 
                texture = SDL_CreateTexture(data->renderer,
                                            SDL_PIXELFORMAT_YUY2,
                                            SDL_TEXTUREACCESS_STREAMING, WIDTH, HEIGHT);
                if (!texture) {
                        printf("can't create texture: %s\n", SDL_GetError());
                        return -ENOMEM;
                }
                if (SDL_LockTexture(texture, NULL, &ptr, &stride) < 0) {
                        fprintf(stderr, "Couldn't lock texture: %s\n", SDL_GetError());
                        return -EIO;
                }
                b->texture = texture;
 
                b->datas[0].maxsize = stride * HEIGHT;
                b->datas[0].data = ptr;
                b->datas[0].chunk->offset = 0;
                b->datas[0].chunk->size = stride * HEIGHT;
                b->datas[0].chunk->stride = stride;
        }
        return 0;
}
 
static int negotiate_formats(struct data *data)
{
        uint8_t buffer[256];
 
 
                                  &data->source_output[0], sizeof(data->source_output[0]))) < 0)
 
 
                                           format)) < 0)
 
 
        setup_buffers(data);
 
        if (data->use_buffer) {
                if ((
res = sdl_alloc_buffers(data)) < 0)
 
 
                                                data->bp, data->n_buffers)) < 0) {
                        return -1;
                }
        } else {
                unsigned int n_buffers;
 
                data->texture = SDL_CreateTexture(data->renderer,
                                                  SDL_PIXELFORMAT_YUY2,
                                                  SDL_TEXTUREACCESS_STREAMING, WIDTH, HEIGHT);
                if (!data->texture) {
                        printf("can't create texture: %s\n", SDL_GetError());
                        return -1;
                }
                n_buffers = MAX_BUFFERS;
                                                data->bp, n_buffers)) < 0) {
                        return -1;
                }
                data->n_buffers = n_buffers;
        }
        return 0;
}
 
static void loop(struct data *data)
{
        SDL_Event event;
 
        printf("starting...\n\n");
                printf(
"got error %d\n", 
res);
 
        data->running = true;
 
        while (data->running) {
                
                while (SDL_PollEvent(&event)) {
                        switch (event.type) {
                        case SDL_QUIT:
                                data->running = false;
                                break;
                        }
                }
 
                
        }
 
        printf("pausing...\n\n");
                printf(
"got error %d\n", 
res);
}
 
int main(int argc, char *argv[])
{
        struct data data = { 0 };
        const char *str;
        void *iface;
 
        if ((str = getenv("SPA_PLUGIN_DIR")) == NULL)
                str = PLUGINDIR;
        data.plugin_dir = str;
 
        if ((
res = load_handle(&data, &handle,
 
                                        "support/libspa-support.so",
 
                printf(
"can't get System interface %d\n", 
res);
        }
        data.system = iface;
 
        if ((
res = load_handle(&data, &handle,
 
                                        "support/libspa-support.so",
 
                printf(
"can't get interface %d\n", 
res);
        }
        data.loop = iface;
                printf(
"can't get interface %d\n", 
res);
        }
        data.control = iface;
 
        data.use_buffer = USE_BUFFER;
 
        data.log = &default_log.log;
 
        if ((str = getenv("SPA_DEBUG")))
                data.log->level = atoi(str);
 
 
        if (SDL_Init(SDL_INIT_VIDEO) < 0) {
                printf("can't initialize SDL: %s\n", SDL_GetError());
                return -1;
        }
 
        if (SDL_CreateWindowAndRenderer
            (WIDTH, HEIGHT, SDL_WINDOW_RESIZABLE, &data.window, &data.renderer)) {
                printf("can't create window: %s\n", SDL_GetError());
                return -1;
        }
 
        if ((
res = make_nodes(&data, argv[1])) < 0) {
 
                printf(
"can't make nodes: %d\n", 
res);
                return -1;
        }
 
        if ((
res = negotiate_formats(&data)) < 0) {
 
                printf(
"can't negotiate nodes: %d\n", 
res);
                return -1;
        }
 
        loop(&data);
 
        SDL_DestroyRenderer(data.renderer);
 
        return 0;
}
uint32_t int int res
Definition core.h:433
@ SPA_META_Header
struct spa_meta_header
Definition meta.h:37
@ SPA_DATA_MemFd
memfd, mmap to get to memory.
Definition buffer.h:45
@ SPA_DATA_MemPtr
pointer to memory, the data field in struct spa_data is set.
Definition buffer.h:43
@ SPA_DATA_DmaBuf
fd to dmabuf memory.
Definition buffer.h:46
SPA_API_DEBUG_POD int spa_debug_pod(int indent, const struct spa_type_info *info, const struct spa_pod *pod)
Definition pod.h:208
int(* spa_handle_factory_enum_func_t)(const struct spa_handle_factory **factory, uint32_t *index)
The function signature of the entry point in a plugin.
Definition plugin.h:222
#define SPA_HANDLE_FACTORY_ENUM_FUNC_NAME
Definition plugin.h:226
SPA_API_PLUGIN size_t spa_handle_factory_get_size(const struct spa_handle_factory *object, const struct spa_dict *params)
Definition plugin.h:192
SPA_API_PLUGIN int spa_handle_get_interface(struct spa_handle *object, const char *type, void **iface)
Definition plugin.h:74
#define SPA_SUPPORT_INIT(type, data)
Definition plugin.h:117
SPA_API_PLUGIN int spa_handle_factory_init(const struct spa_handle_factory *object, struct spa_handle *handle, const struct spa_dict *info, const struct spa_support *support, uint32_t n_support)
Definition plugin.h:198
#define SPA_LOG_IMPL(name)
Definition log-impl.h:119
#define SPA_TYPE_INTERFACE_Log
The Log interface.
Definition log.h:68
SPA_API_LOOP void spa_loop_control_enter(struct spa_loop_control *object)
Definition loop.h:313
#define SPA_TYPE_INTERFACE_DataLoop
Definition loop.h:45
#define SPA_TYPE_INTERFACE_Loop
Definition loop.h:43
SPA_API_LOOP int spa_loop_control_iterate(struct spa_loop_control *object, int timeout)
Definition loop.h:321
#define SPA_TYPE_INTERFACE_LoopControl
Definition loop.h:51
SPA_API_LOOP void spa_loop_control_leave(struct spa_loop_control *object)
Definition loop.h:317
#define SPA_NAME_API_LIBCAMERA_SOURCE
a libcamera Node interface for capturing
Definition names.h:177
#define SPA_NAME_SUPPORT_LOOP
A Loop/LoopControl/LoopUtils interface.
Definition names.h:34
#define SPA_NAME_SUPPORT_SYSTEM
A System interface.
Definition names.h:37
SPA_API_NODE int spa_node_port_set_param(struct spa_node *object, enum spa_direction direction, uint32_t port_id, uint32_t id, uint32_t flags, const struct spa_pod *param)
Definition node.h:780
#define SPA_STATUS_HAVE_DATA
Definition io.h:86
#define SPA_TYPE_INTERFACE_Node
Definition node.h:47
#define SPA_VERSION_NODE_CALLBACKS
Definition node.h:244
SPA_API_NODE_UTILS int spa_node_enum_params_sync(struct spa_node *node, uint32_t id, uint32_t *index, const struct spa_pod *filter, struct spa_pod **param, struct spa_pod_builder *builder)
Definition utils.h:55
#define SPA_STATUS_NEED_DATA
Definition io.h:84
SPA_API_NODE int spa_node_port_set_io(struct spa_node *object, enum spa_direction direction, uint32_t port_id, uint32_t id, void *data, size_t size)
Definition node.h:799
SPA_API_NODE int spa_node_set_param(struct spa_node *object, uint32_t id, uint32_t flags, const struct spa_pod *param)
Definition node.h:740
SPA_API_NODE int spa_node_port_use_buffers(struct spa_node *object, enum spa_direction direction, uint32_t port_id, uint32_t flags, struct spa_buffer **buffers, uint32_t n_buffers)
Definition node.h:789
SPA_API_NODE int spa_node_send_command(struct spa_node *object, const struct spa_command *command)
Definition node.h:753
SPA_API_NODE int spa_node_process(struct spa_node *object)
Definition node.h:818
#define SPA_IO_BUFFERS_INIT
Definition io.h:96
#define SPA_NODE_BUFFERS_FLAG_ALLOC
flags to pass to the use_buffers functions
Definition node.h:296
SPA_API_NODE int spa_node_set_callbacks(struct spa_node *object, const struct spa_node_callbacks *callbacks, void *data)
Definition node.h:721
#define SPA_NODE_COMMAND_INIT(id)
Definition command.h:49
@ SPA_IO_Buffers
area to exchange buffers, struct spa_io_buffers
Definition io.h:38
@ SPA_NODE_COMMAND_Pause
pause a node.
Definition command.h:28
@ SPA_NODE_COMMAND_Start
start a node, this makes it start emitting scheduling events
Definition command.h:30
#define SPA_VIDEO_INFO_RAW_INIT(...)
Definition raw.h:200
SPA_API_VIDEO_RAW_UTILS struct spa_pod * spa_format_video_raw_build(struct spa_pod_builder *builder, uint32_t id, const struct spa_video_info_raw *info)
Definition raw-utils.h:68
@ SPA_PROP_device
Definition props.h:47
@ SPA_PARAM_Format
configured format as SPA_TYPE_OBJECT_Format
Definition param.h:34
@ SPA_PARAM_Props
properties as SPA_TYPE_OBJECT_Props
Definition param.h:32
@ SPA_VIDEO_FORMAT_YUY2
Definition raw.h:49
#define SPA_POD_String(val)
Definition vararg.h:94
#define SPA_POD_BUILDER_INIT(buffer, size)
Definition builder.h:72
SPA_API_POD_BUILDER void spa_pod_builder_init(struct spa_pod_builder *builder, void *data, uint32_t size)
Definition builder.h:97
#define spa_pod_builder_add_object(b, type, id,...)
Definition builder.h:703
SPA_API_RESULT const char * spa_strerror(int err)
Definition result.h:61
SPA_API_STRING bool spa_streq(const char *s1, const char *s2)
Definition string.h:51
#define SPA_TYPE_INTERFACE_System
a collection of core system functions
Definition system.h:50
@ SPA_TYPE_OBJECT_Props
Definition type.h:86
#define spa_aprintf(_fmt,...)
Definition defs.h:528
#define SPA_MIN(a, b)
Definition defs.h:165
#define SPA_FRACTION(num, denom)
Definition defs.h:136
#define SPA_RECTANGLE(width, height)
Definition defs.h:115
@ SPA_DIRECTION_OUTPUT
Definition defs.h:108
A Buffer.
Definition buffer.h:110
Chunk of memory, can change for each buffer.
Definition buffer.h:59
int32_t stride
stride of valid data
Definition buffer.h:65
Data for a buffer this stays constant for a buffer.
Definition buffer.h:78
struct spa_chunk * chunk
valid chunk of memory
Definition buffer.h:106
void * data
optional data pointer
Definition buffer.h:105
A hook, contains the structure with functions and the data passed to the functions.
Definition hook.h:427
IO area to exchange buffers.
Definition io.h:80
int32_t status
the status code
Definition io.h:91
uint32_t buffer_id
a buffer id
Definition io.h:92
Node callbacks.
Definition node.h:242
uint32_t size
Definition builder.h:65
Extra supporting infrastructure passed to the init() function of a factory.
Definition plugin.h:98