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-rw-r--r--src/examples/local-v4l2.c469
1 files changed, 469 insertions, 0 deletions
diff --git a/src/examples/local-v4l2.c b/src/examples/local-v4l2.c
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+++ b/src/examples/local-v4l2.c
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+/* PipeWire
+ *
+ * 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]
+ Using libspa-v4l2
+ [title]
+ */
+
+#include <stdio.h>
+#include <sys/mman.h>
+
+#define WIDTH 640
+#define HEIGHT 480
+#define BPP 3
+#define MAX_BUFFERS 32
+
+#include "sdl.h"
+
+#include <spa/param/video/format-utils.h>
+#include <spa/param/props.h>
+#include <spa/pod/filter.h>
+#include <spa/node/io.h>
+#include <spa/node/utils.h>
+#include <spa/debug/format.h>
+#include <spa/utils/names.h>
+
+#include <pipewire/impl.h>
+
+struct data {
+ SDL_Renderer *renderer;
+ SDL_Window *window;
+ SDL_Texture *texture;
+
+ struct pw_main_loop *loop;
+
+ struct pw_context *context;
+ struct pw_core *core;
+
+ struct spa_port_info info;
+ struct spa_param_info params[4];
+
+ struct spa_node impl_node;
+ struct spa_io_buffers *io;
+
+ struct spa_hook_list hooks;
+
+ struct spa_video_info_raw format;
+ int32_t stride;
+
+ struct spa_buffer *buffers[MAX_BUFFERS];
+ int n_buffers;
+
+ struct pw_proxy *out, *in, *link;
+};
+
+static void handle_events(struct data *data)
+{
+ SDL_Event event;
+ while (SDL_PollEvent(&event)) {
+ switch (event.type) {
+ case SDL_QUIT:
+ pw_main_loop_quit(data->loop);
+ break;
+ }
+ }
+}
+
+static int impl_set_io(void *object, uint32_t id, void *data, size_t size)
+{
+ return 0;
+}
+
+static int impl_send_command(void *object, const struct spa_command *command)
+{
+ return 0;
+}
+
+static int impl_add_listener(void *object,
+ struct spa_hook *listener,
+ const struct spa_node_events *events,
+ void *data)
+{
+ struct data *d = object;
+ struct spa_hook_list save;
+
+ spa_hook_list_isolate(&d->hooks, &save, listener, events, data);
+
+ spa_node_emit_port_info(&d->hooks, SPA_DIRECTION_INPUT, 0, &d->info);
+
+ spa_hook_list_join(&d->hooks, &save);
+
+ return 0;
+}
+
+static int impl_set_callbacks(void *object,
+ const struct spa_node_callbacks *callbacks, void *data)
+{
+ return 0;
+}
+
+static int impl_port_set_io(void *object, enum spa_direction direction, uint32_t port_id,
+ uint32_t id, void *data, size_t size)
+{
+ struct data *d = object;
+
+ if (id == SPA_IO_Buffers)
+ d->io = data;
+ else
+ return -ENOENT;
+
+ return 0;
+}
+
+static int impl_port_enum_params(void *object, int seq,
+ enum spa_direction direction, uint32_t port_id,
+ uint32_t id, uint32_t start, uint32_t num,
+ const struct spa_pod *filter)
+{
+ struct data *d = object;
+ struct spa_pod *param;
+ struct spa_pod_builder b = { 0 };
+ uint8_t buffer[1024];
+ struct spa_result_node_params result;
+ uint32_t count = 0;
+
+ result.id = id;
+ result.next = start;
+ next:
+ result.index = result.next++;
+
+ spa_pod_builder_init(&b, buffer, sizeof(buffer));
+
+ switch (id) {
+ case SPA_PARAM_EnumFormat:
+ {
+ SDL_RendererInfo info;
+
+ if (result.index > 0)
+ return 0;
+
+ SDL_GetRendererInfo(d->renderer, &info);
+ param = sdl_build_formats(&info, &b);
+ break;
+ }
+ case SPA_PARAM_Buffers:
+ if (result.index > 0)
+ return 0;
+
+ param = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_ParamBuffers, id,
+ SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(2, 1, 32),
+ SPA_PARAM_BUFFERS_blocks, SPA_POD_Int(1),
+ SPA_PARAM_BUFFERS_size, SPA_POD_Int(d->stride * d->format.size.height),
+ SPA_PARAM_BUFFERS_stride, SPA_POD_Int(d->stride));
+ break;
+
+ case SPA_PARAM_Meta:
+ if (result.index > 0)
+ return 0;
+
+ param = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_ParamMeta, id,
+ SPA_PARAM_META_type, SPA_POD_Id(SPA_META_Header),
+ SPA_PARAM_META_size, SPA_POD_Int(sizeof(struct spa_meta_header)));
+ break;
+
+ default:
+ return -ENOENT;
+ }
+
+ if (spa_pod_filter(&b, &result.param, param, filter) < 0)
+ goto next;
+
+ spa_node_emit_result(&d->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);
+
+ if (++count != num)
+ goto next;
+
+ return 0;
+}
+
+static int port_set_format(void *object, enum spa_direction direction, uint32_t port_id,
+ uint32_t flags, const struct spa_pod *format)
+{
+ struct data *d = object;
+ Uint32 sdl_format;
+ void *dest;
+
+ if (format == NULL) {
+ spa_zero(d->format);
+ SDL_DestroyTexture(d->texture);
+ d->texture = NULL;
+ } else {
+ spa_debug_format(0, NULL, format);
+
+ spa_format_video_raw_parse(format, &d->format);
+
+ sdl_format = id_to_sdl_format(d->format.format);
+ if (sdl_format == SDL_PIXELFORMAT_UNKNOWN)
+ return -EINVAL;
+ if (d->format.size.width == 0 ||
+ d->format.size.height == 0)
+ return -EINVAL;
+
+ d->texture = SDL_CreateTexture(d->renderer,
+ sdl_format,
+ SDL_TEXTUREACCESS_STREAMING,
+ d->format.size.width,
+ d->format.size.height);
+ SDL_LockTexture(d->texture, NULL, &dest, &d->stride);
+ SDL_UnlockTexture(d->texture);
+ }
+
+ d->info.change_mask = SPA_PORT_CHANGE_MASK_PARAMS;
+ if (format) {
+ d->params[1] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_READWRITE);
+ d->params[2] = SPA_PARAM_INFO(SPA_PARAM_Buffers, SPA_PARAM_INFO_READ);
+ } else {
+ d->params[1] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+ d->params[2] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+ }
+ spa_node_emit_port_info(&d->hooks, SPA_DIRECTION_INPUT, 0, &d->info);
+
+ return 0;
+}
+
+static int impl_port_set_param(void *object,
+ enum spa_direction direction, uint32_t port_id,
+ uint32_t id, uint32_t flags,
+ const struct spa_pod *param)
+{
+ if (id == SPA_PARAM_Format) {
+ return port_set_format(object, direction, port_id, flags, param);
+ }
+ else
+ return -ENOENT;
+}
+
+static int impl_port_use_buffers(void *object,
+ enum spa_direction direction, uint32_t port_id,
+ uint32_t flags, struct spa_buffer **buffers, uint32_t n_buffers)
+{
+ struct data *d = object;
+ uint32_t i;
+
+ if (n_buffers > MAX_BUFFERS)
+ return -ENOSPC;
+
+ for (i = 0; i < n_buffers; i++)
+ d->buffers[i] = buffers[i];
+ d->n_buffers = n_buffers;
+ return 0;
+}
+
+static int do_render(struct spa_loop *loop, bool async, uint32_t seq,
+ const void *_data, size_t size, void *user_data)
+{
+ struct data *d = user_data;
+ struct spa_buffer *buf;
+ uint8_t *map;
+ void *sdata, *ddata;
+ int sstride, dstride, ostride;
+ uint32_t i;
+ uint8_t *src, *dst;
+
+ buf = d->buffers[d->io->buffer_id];
+
+ if (buf->datas[0].type == SPA_DATA_MemFd ||
+ buf->datas[0].type == SPA_DATA_DmaBuf) {
+ map = mmap(NULL, buf->datas[0].maxsize + buf->datas[0].mapoffset, PROT_READ,
+ MAP_PRIVATE, buf->datas[0].fd, 0);
+ sdata = SPA_PTROFF(map, buf->datas[0].mapoffset, uint8_t);
+ } else if (buf->datas[0].type == SPA_DATA_MemPtr) {
+ map = NULL;
+ sdata = buf->datas[0].data;
+ } else
+ return -EINVAL;
+
+ if (SDL_LockTexture(d->texture, NULL, &ddata, &dstride) < 0) {
+ fprintf(stderr, "Couldn't lock texture: %s\n", SDL_GetError());
+ return -EIO;
+ }
+ sstride = buf->datas[0].chunk->stride;
+ ostride = SPA_MIN(sstride, dstride);
+
+ src = sdata;
+ dst = ddata;
+ for (i = 0; i < d->format.size.height; i++) {
+ memcpy(dst, src, ostride);
+ src += sstride;
+ dst += dstride;
+ }
+ SDL_UnlockTexture(d->texture);
+
+ SDL_RenderClear(d->renderer);
+ SDL_RenderCopy(d->renderer, d->texture, NULL, NULL);
+ SDL_RenderPresent(d->renderer);
+
+ if (map)
+ munmap(map, buf->datas[0].maxsize + buf->datas[0].mapoffset);
+
+ return 0;
+}
+
+static int impl_node_process(void *object)
+{
+ struct data *d = object;
+ int res;
+
+ if ((res = pw_loop_invoke(pw_main_loop_get_loop(d->loop), do_render,
+ SPA_ID_INVALID, NULL, 0, true, d)) < 0)
+ return res;
+
+ handle_events(d);
+
+ d->io->status = SPA_STATUS_NEED_DATA;
+
+ return SPA_STATUS_NEED_DATA;
+}
+
+static const struct spa_node_methods impl_node = {
+ SPA_VERSION_NODE_METHODS,
+ .add_listener = impl_add_listener,
+ .set_callbacks = impl_set_callbacks,
+ .set_io = impl_set_io,
+ .send_command = impl_send_command,
+ .port_set_io = impl_port_set_io,
+ .port_enum_params = impl_port_enum_params,
+ .port_set_param = impl_port_set_param,
+ .port_use_buffers = impl_port_use_buffers,
+ .process = impl_node_process,
+};
+
+static int make_nodes(struct data *data)
+{
+ struct pw_properties *props;
+
+ data->impl_node.iface = SPA_INTERFACE_INIT(
+ SPA_TYPE_INTERFACE_Node,
+ SPA_VERSION_NODE,
+ &impl_node, data);
+
+ data->info = SPA_PORT_INFO_INIT();
+ data->info.change_mask =
+ SPA_PORT_CHANGE_MASK_FLAGS |
+ SPA_PORT_CHANGE_MASK_PARAMS;
+ data->info.flags = 0;
+ data->params[0] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
+ data->params[1] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+ data->params[2] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+ data->params[3] = SPA_PARAM_INFO(SPA_PARAM_Meta, SPA_PARAM_INFO_READ);
+ data->info.params = data->params;
+ data->info.n_params = SPA_N_ELEMENTS(data->params);
+
+ data->in = pw_core_export(data->core,
+ SPA_TYPE_INTERFACE_Node,
+ NULL,
+ &data->impl_node,
+ 0);
+
+ props = pw_properties_new(
+ SPA_KEY_LIBRARY_NAME, "v4l2/libspa-v4l2",
+ SPA_KEY_FACTORY_NAME, SPA_NAME_API_V4L2_SOURCE,
+ NULL);
+
+ data->out = pw_core_create_object(data->core,
+ "spa-node-factory",
+ PW_TYPE_INTERFACE_Node,
+ PW_VERSION_NODE,
+ &props->dict, 0);
+
+
+ while (true) {
+
+ if (pw_proxy_get_bound_id(data->out) != SPA_ID_INVALID &&
+ pw_proxy_get_bound_id(data->in) != SPA_ID_INVALID)
+ break;
+
+ pw_loop_iterate(pw_main_loop_get_loop(data->loop), -1);
+ }
+
+ pw_properties_clear(props);
+
+ pw_properties_setf(props,
+ PW_KEY_LINK_OUTPUT_NODE, "%d", pw_proxy_get_bound_id(data->out));
+ pw_properties_setf(props,
+ PW_KEY_LINK_INPUT_NODE, "%d", pw_proxy_get_bound_id(data->in));
+
+ data->link = pw_core_create_object(data->core,
+ "link-factory",
+ PW_TYPE_INTERFACE_Link,
+ PW_VERSION_LINK,
+ &props->dict, 0);
+
+ pw_properties_free(props);
+
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ struct data data = { 0, };
+
+ pw_init(&argc, &argv);
+
+ data.loop = pw_main_loop_new(NULL);
+ data.context = pw_context_new(
+ pw_main_loop_get_loop(data.loop),
+ pw_properties_new(
+ PW_KEY_CORE_DAEMON, "false",
+ NULL), 0);
+
+ spa_hook_list_init(&data.hooks);
+
+ pw_context_load_module(data.context, "libpipewire-module-spa-node-factory", NULL, NULL);
+ pw_context_load_module(data.context, "libpipewire-module-link-factory", NULL, NULL);
+
+ 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;
+ }
+
+ data.core = pw_context_connect_self(data.context, NULL, 0);
+ if (data.core == NULL) {
+ printf("can't connect to core: %m\n");
+ return -1;
+ }
+
+ make_nodes(&data);
+
+ pw_main_loop_run(data.loop);
+
+ pw_proxy_destroy(data.link);
+ pw_proxy_destroy(data.in);
+ pw_proxy_destroy(data.out);
+ pw_context_destroy(data.context);
+ pw_main_loop_destroy(data.loop);
+ pw_deinit();
+
+ return 0;
+}
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