PipeWire  0.3.40
local-v4l2.c

Using libspa-v4l2

/* 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
#include "sdl.h"
#include <spa/pod/filter.h>
#include <spa/node/io.h>
#include <spa/node/utils.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;
int32_t stride;
struct spa_buffer *buffers[32];
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;
result.index = result.next++;
spa_pod_builder_init(&b, buffer, sizeof(buffer));
switch (id) {
{
SDL_RendererInfo info;
if (result.index > 0)
return 0;
SDL_GetRendererInfo(d->renderer, &info);
param = sdl_build_formats(&info, &b);
break;
}
if (result.index > 0)
return 0;
SPA_PARAM_BUFFERS_size, SPA_POD_Int(d->stride * d->format.size.height),
break;
if (result.index > 0)
return 0;
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)
return 0;
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;
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;
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;
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;
}
static const struct spa_node_methods impl_node = {
.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(
&impl_node, data);
data->info = SPA_PORT_INFO_INIT();
data->info.change_mask =
data->info.flags = 0;
data->params[2] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
data->info.params = data->params;
data->info.n_params = SPA_N_ELEMENTS(data->params);
data->in = pw_core_export(data->core,
NULL,
&data->impl_node,
0);
SPA_KEY_LIBRARY_NAME, "v4l2/libspa-v4l2",
NULL);
data->out = pw_core_create_object(data->core,
"spa-node-factory",
&props->dict, 0);
while (true) {
break;
}
data->link = pw_core_create_object(data->core,
"link-factory",
&props->dict, 0);
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(
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);
return 0;
}
spa/debug/format.h
void pw_context_destroy(struct pw_context *context)
destroy a context object, all resources except the main_loop will be destroyed
Definition: context.c:413
struct pw_context * pw_context_new(struct pw_loop *main_loop, struct pw_properties *props, size_t user_data_size)
Make a new context object for a given main_loop.
Definition: context.c:189
static void * pw_core_create_object(struct pw_core *core, const char *factory_name, const char *type, uint32_t version, const struct spa_dict *props, size_t user_data_size)
Definition: core.h:415
struct pw_core * pw_context_connect_self(struct pw_context *context, struct pw_properties *properties, size_t user_data_size)
Connect to a given PipeWire instance.
Definition: core.c:454
struct pw_proxy * pw_core_export(struct pw_core *core, const char *type, const struct spa_dict *props, void *object, size_t user_data_size)
Export an object into the PipeWire instance associated with core.
Definition: core.c:275
struct pw_impl_module * pw_context_load_module(struct pw_context *context, const char *name, const char *args, struct pw_properties *properties)
Load a module.
Definition: impl-module.c:160
#define PW_KEY_CORE_DAEMON
If the core is listening for connections.
Definition: keys.h:117
#define PW_KEY_LINK_INPUT_NODE
input node id of a link
Definition: keys.h:292
#define PW_KEY_LINK_OUTPUT_NODE
output node id of a link
Definition: keys.h:296
#define pw_loop_iterate(l,...)
Definition: loop.h:72
#define pw_loop_invoke(l,...)
Definition: loop.h:67
struct pw_main_loop * pw_main_loop_new(const struct spa_dict *props)
Create a new main loop.
Definition: main-loop.c:87
int pw_main_loop_quit(struct pw_main_loop *loop)
Quit a main loop.
Definition: main-loop.c:132
void pw_main_loop_destroy(struct pw_main_loop *loop)
Destroy a loop.
Definition: main-loop.c:97
int pw_main_loop_run(struct pw_main_loop *loop)
Run a main loop.
Definition: main-loop.c:146
struct pw_loop * pw_main_loop_get_loop(struct pw_main_loop *loop)
Get the loop implementation.
Definition: main-loop.c:120
#define PW_TYPE_INTERFACE_Node
Definition: node.h:55
#define PW_VERSION_NODE
Definition: node.h:58
void pw_init(int *argc, char **argv[])
Initialize PipeWire.
Definition: pipewire.c:586
void pw_deinit(void)
Definition: pipewire.c:676
void pw_properties_free(struct pw_properties *properties)
Free a properties object.
Definition: properties.c:368
int pw_properties_setf(struct pw_properties *properties, const char *key, const char *format,...) 1(3
struct pw_properties * pw_properties_new(const char *key,...) 1
Make a new properties object.
Definition: properties.c:102
void pw_properties_clear(struct pw_properties *properties)
Clear a properties object.
Definition: properties.c:281
uint32_t pw_proxy_get_bound_id(struct pw_proxy *proxy)
Get the global id bound to this proxy of SPA_ID_INVALID when not bound to a global.
Definition: proxy.c:169
void pw_proxy_destroy(struct pw_proxy *proxy)
destroy a proxy
Definition: proxy.c:231
@ SPA_META_Header
struct spa_meta_header
Definition: meta.h:47
@ SPA_DATA_MemFd
generic fd, mmap to get to memory
Definition: buffer.h:54
@ SPA_DATA_MemPtr
pointer to memory, the data field in struct spa_data is set.
Definition: buffer.h:52
@ SPA_DATA_DmaBuf
fd to dmabuf memory
Definition: buffer.h:55
static int spa_debug_format(int indent, const struct spa_type_info *info, const struct spa_pod *format)
Definition: format.h:121
#define SPA_KEY_FACTORY_NAME
the name of a factory
Definition: plugin.h:222
#define SPA_KEY_LIBRARY_NAME
the name of a library.
Definition: plugin.h:231
static void spa_hook_list_join(struct spa_hook_list *list, struct spa_hook_list *save)
Definition: hook.h:413
static void spa_hook_list_init(struct spa_hook_list *list)
Initialize a hook list to the empty list.
Definition: hook.h:352
static void spa_hook_list_isolate(struct spa_hook_list *list, struct spa_hook_list *save, struct spa_hook *hook, const void *funcs, void *data)
Definition: hook.h:399
#define SPA_INTERFACE_INIT(_type, _version, _funcs, _data)
Initialize a spa_interface.
Definition: hook.h:177
#define SPA_NAME_API_V4L2_SOURCE
a v4l2 Node interface for capturing
Definition: names.h:166
#define SPA_PORT_CHANGE_MASK_FLAGS
Definition: node.h:115
#define spa_node_emit_port_info(hooks,...)
Definition: utils.h:138
#define SPA_PORT_INFO_INIT()
Definition: node.h:159
#define SPA_TYPE_INTERFACE_Node
Definition: node.h:57
#define SPA_STATUS_NEED_DATA
Definition: io.h:102
#define SPA_VERSION_NODE
Definition: node.h:60
#define SPA_PORT_CHANGE_MASK_PARAMS
Definition: node.h:121
#define SPA_RESULT_TYPE_NODE_PARAMS
Definition: node.h:164
#define spa_node_emit_result(hooks,...)
Definition: utils.h:139
#define SPA_VERSION_NODE_METHODS
Definition: node.h:351
@ SPA_IO_Buffers
area to exchange buffers, struct spa_io_buffers
Definition: io.h:58
#define SPA_PARAM_INFO_WRITE
Definition: param.h:78
#define SPA_PARAM_INFO_READ
Definition: param.h:76
#define SPA_PARAM_INFO_READWRITE
Definition: param.h:80
static int spa_format_video_raw_parse(const struct spa_pod *format, struct spa_video_info_raw *info)
Definition: format-utils.h:47
#define SPA_PARAM_INFO(id, flags)
Definition: param.h:88
@ SPA_PARAM_META_size
the expected maximum size the meta (Int)
Definition: param.h:105
@ SPA_PARAM_META_type
the metadata, one of enum spa_meta_type (Id enum spa_meta_type)
Definition: param.h:104
@ SPA_PARAM_Format
configured format as SPA_TYPE_OBJECT_Format
Definition: param.h:54
@ SPA_PARAM_Meta
allowed metadata for buffers as SPA_TYPE_OBJECT_ParamMeta
Definition: param.h:56
@ SPA_PARAM_EnumFormat
available formats as SPA_TYPE_OBJECT_Format
Definition: param.h:53
@ SPA_PARAM_Buffers
buffer configurations as SPA_TYPE_OBJECT_ParamBuffers
Definition: param.h:55
@ SPA_PARAM_BUFFERS_size
size of a data block memory (Int)
Definition: param.h:95
@ SPA_PARAM_BUFFERS_stride
stride of data block memory (Int)
Definition: param.h:96
@ SPA_PARAM_BUFFERS_align
alignment of data block memory (Int)
Definition: param.h:97
@ SPA_PARAM_BUFFERS_blocks
number of data blocks per buffer (Int)
Definition: param.h:94
@ SPA_PARAM_BUFFERS_buffers
number of buffers (Int)
Definition: param.h:93
#define SPA_POD_CHOICE_RANGE_Int(def, min, max)
Definition: vararg.h:78
#define SPA_POD_Id(val)
Definition: vararg.h:69
#define spa_pod_builder_add_object(b, type, id,...)
Definition: builder.h:677
static void spa_pod_builder_init(struct spa_pod_builder *builder, void *data, uint32_t size)
Definition: builder.h:107
#define SPA_POD_Int(val)
Definition: vararg.h:74
static int spa_pod_filter(struct spa_pod_builder *b, struct spa_pod **result, const struct spa_pod *pod, const struct spa_pod *filter)
Definition: filter.h:392
@ SPA_TYPE_OBJECT_ParamBuffers
Definition: type.h:97
@ SPA_TYPE_OBJECT_ParamMeta
Definition: type.h:98
#define SPA_MIN(a, b)
Definition: defs.h:146
#define SPA_ID_INVALID
Definition: defs.h:217
#define SPA_N_ELEMENTS(arr)
Definition: defs.h:127
spa_direction
Definition: defs.h:90
#define SPA_PTROFF(ptr_, offset_, type_)
Return the address (buffer + offset) as pointer of type.
Definition: defs.h:183
@ SPA_DIRECTION_INPUT
Definition: defs.h:91
pipewire/impl.h
spa/node/io.h
spa/utils/names.h
spa/pod/filter.h
A main loop object.
Definition: properties.h:53
struct spa_dict dict
dictionary of key/values
Definition: properties.h:54
A Buffer.
Definition: buffer.h:105
struct spa_data * datas
array of data members
Definition: buffer.h:109
int32_t stride
stride of valid data
Definition: buffer.h:68
Definition: command.h:49
struct spa_chunk * chunk
valid chunk of memory
Definition: buffer.h:101
int64_t fd
optional fd for data
Definition: buffer.h:97
uint32_t mapoffset
offset to map fd at
Definition: buffer.h:98
void * data
optional data pointer
Definition: buffer.h:100
uint32_t maxsize
max size of data
Definition: buffer.h:99
uint32_t type
memory type, one of enum spa_data_type, when allocating memory, the type contains a bitmask of allowe...
Definition: buffer.h:78
A list of hooks.
Definition: hook.h:331
A hook, contains the structure with functions and the data passed to the functions.
Definition: hook.h:342
IO area to exchange buffers.
Definition: io.h:98
Definition: loop.h:56
Describes essential buffer header metadata such as flags and timestamps.
Definition: meta.h:80
Node callbacks.
Definition: node.h:252
events from the spa_node.
Definition: node.h:196
Node methods.
Definition: node.h:347
Definition: node.h:61
information about a parameter
Definition: param.h:70
Definition: builder.h:73
Definition: pod.h:63
Port information structure.
Definition: node.h:113
the result of enum_params or port_enum_params.
Definition: node.h:172
struct spa_pod * param
the result param
Definition: node.h:176
uint32_t next
next index of iteration
Definition: node.h:175
uint32_t id
id of parameter
Definition: node.h:173
Definition: raw.h:185
enum spa_video_format format
the format
Definition: raw.h:186