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-rw-r--r--spa/examples/local-v4l2.c553
1 files changed, 553 insertions, 0 deletions
diff --git a/spa/examples/local-v4l2.c b/spa/examples/local-v4l2.c
new file mode 100644
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+++ b/spa/examples/local-v4l2.c
@@ -0,0 +1,553 @@
+/* Spa
+ *
+ * Copyright © 2018 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ [title]
+ Example using libspa-v4l2, with only \ref api_spa
+ [title]
+ */
+
+#include "config.h"
+
+#include <string.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/support/plugin.h>
+#include <spa/utils/names.h>
+#include <spa/utils/result.h>
+#include <spa/utils/string.h>
+#include <spa/support/log-impl.h>
+#include <spa/support/loop.h>
+#include <spa/node/node.h>
+#include <spa/node/io.h>
+#include <spa/node/utils.h>
+#include <spa/param/param.h>
+#include <spa/param/props.h>
+#include <spa/param/video/format-utils.h>
+#include <spa/debug/pod.h>
+
+static SPA_LOG_IMPL(default_log);
+
+#define MAX_BUFFERS 8
+
+struct buffer {
+ struct spa_buffer buffer;
+ struct spa_meta metas[1];
+ struct spa_meta_header header;
+ struct spa_data datas[1];
+ struct spa_chunk chunks[1];
+ SDL_Texture *texture;
+};
+
+struct data {
+ const char *plugin_dir;
+ struct spa_log *log;
+ struct spa_system *system;
+ struct spa_loop *loop;
+ struct spa_loop_control *control;
+
+ struct spa_support support[5];
+ uint32_t n_support;
+
+ struct spa_node *source;
+ struct spa_hook listener;
+ struct spa_io_buffers source_output[1];
+
+ SDL_Renderer *renderer;
+ SDL_Window *window;
+ SDL_Texture *texture;
+
+ bool use_buffer;
+
+ bool running;
+ pthread_t thread;
+
+ struct spa_buffer *bp[MAX_BUFFERS];
+ 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)
+{
+ int res;
+ void *hnd;
+ spa_handle_factory_enum_func_t enum_func;
+ 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 -ENOENT;
+ }
+ free(path);
+ if ((enum_func = dlsym(hnd, SPA_HANDLE_FACTORY_ENUM_FUNC_NAME)) == NULL) {
+ printf("can't find enum function\n");
+ return -ENOENT;
+ }
+
+ for (i = 0;;) {
+ const struct spa_handle_factory *factory;
+
+ if ((res = enum_func(&factory, &i)) <= 0) {
+ if (res != 0)
+ printf("can't enumerate factories: %s\n", spa_strerror(res));
+ break;
+ }
+ if (factory->version < 1)
+ continue;
+ if (!spa_streq(factory->name, name))
+ continue;
+
+ *handle = calloc(1, spa_handle_factory_get_size(factory, NULL));
+ if ((res = spa_handle_factory_init(factory, *handle,
+ NULL, data->support,
+ data->n_support)) < 0) {
+ printf("can't make factory instance: %d\n", res);
+ return res;
+ }
+ return 0;
+ }
+ return -EBADF;
+}
+
+static int make_node(struct data *data, struct spa_node **node, const char *lib, const char *name)
+{
+ struct spa_handle *handle = NULL;
+ void *iface;
+ int res;
+
+ if ((res = load_handle(data, &handle, lib, name)) < 0)
+ return res;
+
+ if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_Node, &iface)) < 0) {
+ printf("can't get interface %d\n", res);
+ return res;
+ }
+ *node = iface;
+ return 0;
+}
+
+static int on_source_ready(void *_data, int status)
+{
+ struct data *data = _data;
+ int res;
+ struct buffer *b;
+ void *sdata, *ddata;
+ int sstride, dstride;
+ int i;
+ uint8_t *src, *dst;
+ struct spa_data *datas;
+ struct spa_io_buffers *io = &data->source_output[0];
+
+ if (io->status != SPA_STATUS_HAVE_DATA ||
+ io->buffer_id >= MAX_BUFFERS)
+ return -EINVAL;
+
+ b = &data->buffers[io->buffer_id];
+ io->status = SPA_STATUS_NEED_DATA;
+
+ 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;
+ }
+ sdata = datas[0].data;
+ if (datas[0].type == SPA_DATA_MemFd ||
+ datas[0].type == SPA_DATA_DmaBuf) {
+ map = mmap(NULL, datas[0].maxsize + datas[0].mapoffset, PROT_READ,
+ MAP_PRIVATE, datas[0].fd, 0);
+ if (map == MAP_FAILED)
+ return -errno;
+ sdata = SPA_PTROFF(map, datas[0].mapoffset, uint8_t);
+ } else if (datas[0].type == SPA_DATA_MemPtr) {
+ map = NULL;
+ sdata = datas[0].data;
+ } else
+ return -EIO;
+
+ sstride = datas[0].chunk->stride;
+
+ for (i = 0; i < 240; 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 + datas[0].mapoffset);
+ }
+
+ if ((res = spa_node_process(data->source)) < 0)
+ printf("got process error %d\n", res);
+
+ return 0;
+}
+
+static const struct spa_node_callbacks source_callbacks = {
+ SPA_VERSION_NODE_CALLBACKS,
+ .ready = on_source_ready,
+};
+
+static int make_nodes(struct data *data, const char *device)
+{
+ int res;
+ struct spa_pod *props;
+ struct spa_pod_builder b = { 0 };
+ uint8_t buffer[256];
+ uint32_t index;
+
+ if ((res =
+ make_node(data, &data->source,
+ "v4l2/libspa-v4l2.so",
+ SPA_NAME_API_V4L2_SOURCE)) < 0) {
+ printf("can't create v4l2-source: %d\n", res);
+ return res;
+ }
+
+ spa_node_set_callbacks(data->source, &source_callbacks, data);
+
+ index = 0;
+ spa_pod_builder_init(&b, buffer, sizeof(buffer));
+ if ((res = spa_node_enum_params_sync(data->source, SPA_PARAM_Props,
+ &index, NULL, &props, &b)) == 1) {
+ spa_debug_pod(0, NULL, props);
+ }
+
+ spa_pod_builder_init(&b, buffer, sizeof(buffer));
+ props = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_Props, 0,
+ SPA_PROP_device, SPA_POD_String(device ? device : "/dev/video0"));
+
+ if ((res = spa_node_set_param(data->source, SPA_PARAM_Props, 0, props)) < 0)
+ printf("got set_props error %d\n", res);
+
+ return 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.flags = 0;
+ b->header.seq = 0;
+ b->header.pts = 0;
+ b->header.dts_offset = 0;
+ b->metas[0].type = SPA_META_Header;
+ b->metas[0].data = &b->header;
+ b->metas[0].size = sizeof(b->header);
+
+ b->datas[0].type = 0;
+ 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, 320, 240);
+ 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].type = SPA_DATA_MemPtr;
+ b->datas[0].maxsize = stride * 240;
+ b->datas[0].data = ptr;
+ b->datas[0].chunk->offset = 0;
+ b->datas[0].chunk->size = stride * 240;
+ b->datas[0].chunk->stride = stride;
+ }
+ return 0;
+}
+
+static int negotiate_formats(struct data *data)
+{
+ int res;
+ struct spa_pod *format;
+ uint8_t buffer[256];
+ struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
+
+ data->source_output[0] = SPA_IO_BUFFERS_INIT;
+
+ if ((res =
+ spa_node_port_set_io(data->source,
+ SPA_DIRECTION_OUTPUT, 0,
+ SPA_IO_Buffers,
+ &data->source_output[0], sizeof(data->source_output[0]))) < 0)
+ return res;
+
+ format = spa_format_video_raw_build(&b, 0,
+ &SPA_VIDEO_INFO_RAW_INIT(
+ .format = SPA_VIDEO_FORMAT_YUY2,
+ .size = SPA_RECTANGLE(320, 240),
+ .framerate = SPA_FRACTION(25,1)));
+
+ if ((res = spa_node_port_set_param(data->source,
+ SPA_DIRECTION_OUTPUT, 0,
+ SPA_PARAM_Format, 0,
+ format)) < 0)
+ return res;
+
+
+ setup_buffers(data);
+
+ if (data->use_buffer) {
+ if ((res = sdl_alloc_buffers(data)) < 0)
+ return res;
+
+ if ((res = spa_node_port_use_buffers(data->source,
+ SPA_DIRECTION_OUTPUT, 0, 0,
+ data->bp, data->n_buffers)) < 0) {
+ printf("can't allocate buffers: %s\n", spa_strerror(res));
+ return -1;
+ }
+ } else {
+ unsigned int n_buffers;
+
+ data->texture = SDL_CreateTexture(data->renderer,
+ SDL_PIXELFORMAT_YUY2,
+ SDL_TEXTUREACCESS_STREAMING, 320, 240);
+ if (!data->texture) {
+ printf("can't create texture: %s\n", SDL_GetError());
+ return -1;
+ }
+ n_buffers = MAX_BUFFERS;
+ if ((res = spa_node_port_use_buffers(data->source,
+ SPA_DIRECTION_OUTPUT, 0,
+ SPA_NODE_BUFFERS_FLAG_ALLOC,
+ data->bp, n_buffers)) < 0) {
+ printf("can't allocate buffers: %s\n", spa_strerror(res));
+ return -1;
+ }
+ data->n_buffers = n_buffers;
+ }
+ return 0;
+}
+
+static void *loop(void *user_data)
+{
+ struct data *data = user_data;
+
+ printf("enter thread\n");
+ spa_loop_control_enter(data->control);
+
+ while (data->running) {
+ spa_loop_control_iterate(data->control, -1);
+ }
+
+ printf("leave thread\n");
+ spa_loop_control_leave(data->control);
+ return NULL;
+}
+
+static void run_async_source(struct data *data)
+{
+ int res, err;
+ struct spa_command cmd;
+ SDL_Event event;
+ bool running = true;
+
+ cmd = SPA_NODE_COMMAND_INIT(SPA_NODE_COMMAND_Start);
+ if ((res = spa_node_send_command(data->source, &cmd)) < 0)
+ printf("got error %d\n", res);
+
+ spa_loop_control_leave(data->control);
+
+ data->running = true;
+ if ((err = pthread_create(&data->thread, NULL, loop, data)) != 0) {
+ printf("can't create thread: %d %s", err, strerror(err));
+ data->running = false;
+ }
+
+ while (running && SDL_WaitEvent(&event)) {
+ switch (event.type) {
+ case SDL_QUIT:
+ running = false;
+ break;
+ }
+ }
+
+ if (data->running) {
+ data->running = false;
+ pthread_join(data->thread, NULL);
+ }
+
+ spa_loop_control_enter(data->control);
+
+ cmd = SPA_NODE_COMMAND_INIT(SPA_NODE_COMMAND_Pause);
+ if ((res = spa_node_send_command(data->source, &cmd)) < 0)
+ printf("got error %d\n", res);
+}
+
+int main(int argc, char *argv[])
+{
+ struct data data = { 0 };
+ int res;
+ const char *str;
+ struct spa_handle *handle = NULL;
+ 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",
+ SPA_NAME_SUPPORT_SYSTEM)) < 0)
+ return res;
+
+ if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_System, &iface)) < 0) {
+ printf("can't get System interface %d\n", res);
+ return res;
+ }
+ data.system = iface;
+ data.support[data.n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_System, data.system);
+
+ if ((res = load_handle(&data, &handle,
+ "support/libspa-support.so",
+ SPA_NAME_SUPPORT_LOOP)) < 0)
+ return res;
+
+ if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_Loop, &iface)) < 0) {
+ printf("can't get interface %d\n", res);
+ return res;
+ }
+ data.loop = iface;
+ if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_LoopControl, &iface)) < 0) {
+ printf("can't get interface %d\n", res);
+ return res;
+ }
+ data.control = iface;
+
+ data.use_buffer = true;
+
+ 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;
+}
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