mirror of
https://gitlab.freedesktop.org/pipewire/pipewire
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98a0e54d5f
Include examples to the documentation, using Doxygen's example system.
554 lines
14 KiB
C
554 lines
14 KiB
C
/* Spa
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*
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* Copyright © 2018 Wim Taymans
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/*
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[title]
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Example using libspa-v4l2, with only \ref api_spa
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[title]
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*/
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#include "config.h"
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <dlfcn.h>
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#include <poll.h>
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#include <pthread.h>
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#include <errno.h>
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#include <sys/mman.h>
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#include <SDL2/SDL.h>
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#include <spa/support/plugin.h>
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#include <spa/utils/names.h>
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#include <spa/utils/result.h>
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#include <spa/utils/string.h>
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#include <spa/support/log-impl.h>
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#include <spa/support/loop.h>
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#include <spa/node/node.h>
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#include <spa/node/io.h>
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#include <spa/node/utils.h>
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#include <spa/param/param.h>
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#include <spa/param/props.h>
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#include <spa/param/video/format-utils.h>
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#include <spa/debug/pod.h>
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static SPA_LOG_IMPL(default_log);
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#define MAX_BUFFERS 8
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struct buffer {
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struct spa_buffer buffer;
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struct spa_meta metas[1];
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struct spa_meta_header header;
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struct spa_data datas[1];
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struct spa_chunk chunks[1];
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SDL_Texture *texture;
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};
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struct data {
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const char *plugin_dir;
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struct spa_log *log;
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struct spa_system *system;
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struct spa_loop *loop;
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struct spa_loop_control *control;
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struct spa_support support[5];
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uint32_t n_support;
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struct spa_node *source;
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struct spa_hook listener;
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struct spa_io_buffers source_output[1];
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SDL_Renderer *renderer;
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SDL_Window *window;
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SDL_Texture *texture;
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bool use_buffer;
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bool running;
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pthread_t thread;
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struct spa_buffer *bp[MAX_BUFFERS];
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struct buffer buffers[MAX_BUFFERS];
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unsigned int n_buffers;
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};
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static int load_handle(struct data *data, struct spa_handle **handle, const char *lib, const char *name)
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{
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int res;
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void *hnd;
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spa_handle_factory_enum_func_t enum_func;
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uint32_t i;
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char *path = NULL;
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if ((path = spa_aprintf("%s/%s", data->plugin_dir, lib)) == NULL) {
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return -ENOMEM;
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}
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if ((hnd = dlopen(path, RTLD_NOW)) == NULL) {
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printf("can't load %s: %s\n", path, dlerror());
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free(path);
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return -ENOENT;
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}
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free(path);
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if ((enum_func = dlsym(hnd, SPA_HANDLE_FACTORY_ENUM_FUNC_NAME)) == NULL) {
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printf("can't find enum function\n");
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return -ENOENT;
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}
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for (i = 0;;) {
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const struct spa_handle_factory *factory;
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if ((res = enum_func(&factory, &i)) <= 0) {
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if (res != 0)
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printf("can't enumerate factories: %s\n", spa_strerror(res));
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break;
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}
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if (factory->version < 1)
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continue;
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if (!spa_streq(factory->name, name))
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continue;
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*handle = calloc(1, spa_handle_factory_get_size(factory, NULL));
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if ((res = spa_handle_factory_init(factory, *handle,
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NULL, data->support,
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data->n_support)) < 0) {
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printf("can't make factory instance: %d\n", res);
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return res;
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}
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return 0;
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}
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return -EBADF;
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}
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static int make_node(struct data *data, struct spa_node **node, const char *lib, const char *name)
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{
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struct spa_handle *handle = NULL;
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void *iface;
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int res;
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if ((res = load_handle(data, &handle, lib, name)) < 0)
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return res;
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if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_Node, &iface)) < 0) {
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printf("can't get interface %d\n", res);
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return res;
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}
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*node = iface;
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return 0;
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}
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static int on_source_ready(void *_data, int status)
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{
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struct data *data = _data;
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int res;
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struct buffer *b;
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void *sdata, *ddata;
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int sstride, dstride;
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int i;
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uint8_t *src, *dst;
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struct spa_data *datas;
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struct spa_io_buffers *io = &data->source_output[0];
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if (io->status != SPA_STATUS_HAVE_DATA ||
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io->buffer_id >= MAX_BUFFERS)
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return -EINVAL;
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b = &data->buffers[io->buffer_id];
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io->status = SPA_STATUS_NEED_DATA;
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datas = b->buffer.datas;
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if (b->texture) {
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SDL_Texture *texture = b->texture;
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SDL_UnlockTexture(texture);
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SDL_RenderClear(data->renderer);
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SDL_RenderCopy(data->renderer, texture, NULL, NULL);
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SDL_RenderPresent(data->renderer);
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if (SDL_LockTexture(texture, NULL, &sdata, &sstride) < 0) {
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fprintf(stderr, "Couldn't lock texture: %s\n", SDL_GetError());
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return -EIO;
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}
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} else {
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uint8_t *map;
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if (SDL_LockTexture(data->texture, NULL, &ddata, &dstride) < 0) {
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fprintf(stderr, "Couldn't lock texture: %s\n", SDL_GetError());
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return -EIO;
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}
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sdata = datas[0].data;
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if (datas[0].type == SPA_DATA_MemFd ||
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datas[0].type == SPA_DATA_DmaBuf) {
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map = mmap(NULL, datas[0].maxsize + datas[0].mapoffset, PROT_READ,
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MAP_PRIVATE, datas[0].fd, 0);
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if (map == MAP_FAILED)
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return -errno;
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sdata = SPA_PTROFF(map, datas[0].mapoffset, uint8_t);
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} else if (datas[0].type == SPA_DATA_MemPtr) {
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map = NULL;
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sdata = datas[0].data;
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} else
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return -EIO;
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sstride = datas[0].chunk->stride;
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for (i = 0; i < 240; i++) {
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src = ((uint8_t *) sdata + i * sstride);
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dst = ((uint8_t *) ddata + i * dstride);
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memcpy(dst, src, SPA_MIN(sstride, dstride));
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}
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SDL_UnlockTexture(data->texture);
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SDL_RenderClear(data->renderer);
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SDL_RenderCopy(data->renderer, data->texture, NULL, NULL);
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SDL_RenderPresent(data->renderer);
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if (map)
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munmap(map, datas[0].maxsize + datas[0].mapoffset);
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}
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if ((res = spa_node_process(data->source)) < 0)
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printf("got process error %d\n", res);
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return 0;
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}
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static const struct spa_node_callbacks source_callbacks = {
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SPA_VERSION_NODE_CALLBACKS,
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.ready = on_source_ready,
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};
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static int make_nodes(struct data *data, const char *device)
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{
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int res;
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struct spa_pod *props;
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struct spa_pod_builder b = { 0 };
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uint8_t buffer[256];
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uint32_t index;
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if ((res =
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make_node(data, &data->source,
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"v4l2/libspa-v4l2.so",
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SPA_NAME_API_V4L2_SOURCE)) < 0) {
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printf("can't create v4l2-source: %d\n", res);
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return res;
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}
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spa_node_set_callbacks(data->source, &source_callbacks, data);
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index = 0;
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spa_pod_builder_init(&b, buffer, sizeof(buffer));
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if ((res = spa_node_enum_params_sync(data->source, SPA_PARAM_Props,
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&index, NULL, &props, &b)) == 1) {
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spa_debug_pod(0, NULL, props);
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}
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spa_pod_builder_init(&b, buffer, sizeof(buffer));
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props = spa_pod_builder_add_object(&b,
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SPA_TYPE_OBJECT_Props, 0,
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SPA_PROP_device, SPA_POD_String(device ? device : "/dev/video0"));
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if ((res = spa_node_set_param(data->source, SPA_PARAM_Props, 0, props)) < 0)
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printf("got set_props error %d\n", res);
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return res;
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}
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static int setup_buffers(struct data *data)
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{
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int i;
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for (i = 0; i < MAX_BUFFERS; i++) {
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struct buffer *b = &data->buffers[i];
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data->bp[i] = &b->buffer;
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b->texture = NULL;
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b->buffer.metas = b->metas;
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b->buffer.n_metas = 1;
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b->buffer.datas = b->datas;
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b->buffer.n_datas = 1;
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b->header.flags = 0;
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b->header.seq = 0;
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b->header.pts = 0;
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b->header.dts_offset = 0;
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b->metas[0].type = SPA_META_Header;
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b->metas[0].data = &b->header;
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b->metas[0].size = sizeof(b->header);
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b->datas[0].type = 0;
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b->datas[0].flags = 0;
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b->datas[0].fd = -1;
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b->datas[0].mapoffset = 0;
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b->datas[0].maxsize = 0;
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b->datas[0].data = NULL;
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b->datas[0].chunk = &b->chunks[0];
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b->datas[0].chunk->offset = 0;
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b->datas[0].chunk->size = 0;
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b->datas[0].chunk->stride = 0;
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}
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data->n_buffers = MAX_BUFFERS;
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return 0;
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}
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static int sdl_alloc_buffers(struct data *data)
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{
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int i;
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for (i = 0; i < MAX_BUFFERS; i++) {
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struct buffer *b = &data->buffers[i];
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SDL_Texture *texture;
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void *ptr;
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int stride;
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texture = SDL_CreateTexture(data->renderer,
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SDL_PIXELFORMAT_YUY2,
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SDL_TEXTUREACCESS_STREAMING, 320, 240);
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if (!texture) {
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printf("can't create texture: %s\n", SDL_GetError());
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return -ENOMEM;
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}
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if (SDL_LockTexture(texture, NULL, &ptr, &stride) < 0) {
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fprintf(stderr, "Couldn't lock texture: %s\n", SDL_GetError());
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return -EIO;
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}
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b->texture = texture;
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b->datas[0].type = SPA_DATA_MemPtr;
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b->datas[0].maxsize = stride * 240;
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b->datas[0].data = ptr;
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b->datas[0].chunk->offset = 0;
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b->datas[0].chunk->size = stride * 240;
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b->datas[0].chunk->stride = stride;
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}
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return 0;
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}
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static int negotiate_formats(struct data *data)
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{
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int res;
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struct spa_pod *format;
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uint8_t buffer[256];
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struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
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data->source_output[0] = SPA_IO_BUFFERS_INIT;
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if ((res =
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spa_node_port_set_io(data->source,
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SPA_DIRECTION_OUTPUT, 0,
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SPA_IO_Buffers,
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&data->source_output[0], sizeof(data->source_output[0]))) < 0)
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return res;
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format = spa_format_video_raw_build(&b, 0,
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&SPA_VIDEO_INFO_RAW_INIT(
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.format = SPA_VIDEO_FORMAT_YUY2,
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.size = SPA_RECTANGLE(320, 240),
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.framerate = SPA_FRACTION(25,1)));
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if ((res = spa_node_port_set_param(data->source,
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SPA_DIRECTION_OUTPUT, 0,
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SPA_PARAM_Format, 0,
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format)) < 0)
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return res;
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setup_buffers(data);
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if (data->use_buffer) {
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if ((res = sdl_alloc_buffers(data)) < 0)
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return res;
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if ((res = spa_node_port_use_buffers(data->source,
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SPA_DIRECTION_OUTPUT, 0, 0,
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data->bp, data->n_buffers)) < 0) {
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printf("can't allocate buffers: %s\n", spa_strerror(res));
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return -1;
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}
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} else {
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unsigned int n_buffers;
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data->texture = SDL_CreateTexture(data->renderer,
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SDL_PIXELFORMAT_YUY2,
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SDL_TEXTUREACCESS_STREAMING, 320, 240);
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if (!data->texture) {
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printf("can't create texture: %s\n", SDL_GetError());
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return -1;
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}
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n_buffers = MAX_BUFFERS;
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if ((res = spa_node_port_use_buffers(data->source,
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SPA_DIRECTION_OUTPUT, 0,
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SPA_NODE_BUFFERS_FLAG_ALLOC,
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data->bp, n_buffers)) < 0) {
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printf("can't allocate buffers: %s\n", spa_strerror(res));
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return -1;
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}
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data->n_buffers = n_buffers;
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}
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return 0;
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}
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static void *loop(void *user_data)
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{
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struct data *data = user_data;
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printf("enter thread\n");
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spa_loop_control_enter(data->control);
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while (data->running) {
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spa_loop_control_iterate(data->control, -1);
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}
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printf("leave thread\n");
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spa_loop_control_leave(data->control);
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return NULL;
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}
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static void run_async_source(struct data *data)
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{
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int res, err;
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struct spa_command cmd;
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SDL_Event event;
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bool running = true;
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cmd = SPA_NODE_COMMAND_INIT(SPA_NODE_COMMAND_Start);
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if ((res = spa_node_send_command(data->source, &cmd)) < 0)
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printf("got error %d\n", res);
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spa_loop_control_leave(data->control);
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data->running = true;
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if ((err = pthread_create(&data->thread, NULL, loop, data)) != 0) {
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printf("can't create thread: %d %s", err, strerror(err));
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data->running = false;
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}
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while (running && SDL_WaitEvent(&event)) {
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switch (event.type) {
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case SDL_QUIT:
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running = false;
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break;
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}
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}
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if (data->running) {
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data->running = false;
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pthread_join(data->thread, NULL);
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}
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spa_loop_control_enter(data->control);
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cmd = SPA_NODE_COMMAND_INIT(SPA_NODE_COMMAND_Pause);
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if ((res = spa_node_send_command(data->source, &cmd)) < 0)
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printf("got error %d\n", res);
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}
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int main(int argc, char *argv[])
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{
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struct data data = { 0 };
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int res;
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const char *str;
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struct spa_handle *handle = NULL;
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void *iface;
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if ((str = getenv("SPA_PLUGIN_DIR")) == NULL)
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str = PLUGINDIR;
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data.plugin_dir = str;
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if ((res = load_handle(&data, &handle,
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"support/libspa-support.so",
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SPA_NAME_SUPPORT_SYSTEM)) < 0)
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return res;
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if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_System, &iface)) < 0) {
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printf("can't get System interface %d\n", res);
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return res;
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}
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data.system = iface;
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data.support[data.n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_System, data.system);
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if ((res = load_handle(&data, &handle,
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"support/libspa-support.so",
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SPA_NAME_SUPPORT_LOOP)) < 0)
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return res;
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if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_Loop, &iface)) < 0) {
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printf("can't get interface %d\n", res);
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return res;
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}
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data.loop = iface;
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if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_LoopControl, &iface)) < 0) {
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printf("can't get interface %d\n", res);
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return res;
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}
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data.control = iface;
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data.use_buffer = true;
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data.log = &default_log.log;
|
|
|
|
if ((str = getenv("SPA_DEBUG")))
|
|
data.log->level = atoi(str);
|
|
|
|
data.support[data.n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_Log, data.log);
|
|
data.support[data.n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_Loop, data.loop);
|
|
data.support[data.n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_DataLoop, data.loop);
|
|
|
|
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
|
|
printf("can't initialize SDL: %s\n", SDL_GetError());
|
|
return -1;
|
|
}
|
|
|
|
if (SDL_CreateWindowAndRenderer
|
|
(320, 240, 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;
|
|
}
|
|
|
|
spa_loop_control_enter(data.control);
|
|
run_async_source(&data);
|
|
spa_loop_control_leave(data.control);
|
|
|
|
SDL_DestroyRenderer(data.renderer);
|
|
|
|
return 0;
|
|
}
|