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local-v4l2.c

Using libspa-v4l2

/* PipeWire */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */
/*
[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;
}
format.h
spa/debug/format.h
pw_context_destroy
void pw_context_destroy(struct pw_context *context)
destroy a context object, all resources except the main_loop will be destroyed
Definition context.c:387
pw_context_new
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:175
pw_context_connect_self
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:443
pw_core_export
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:266
pw_core_create_object
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:416
pw_context_load_module
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:138
PW_KEY_CORE_DAEMON
#define PW_KEY_CORE_DAEMON
If the core is listening for connections.
Definition keys.h:107
PW_KEY_LINK_INPUT_NODE
#define PW_KEY_LINK_INPUT_NODE
input node id of a link
Definition keys.h:310
PW_KEY_LINK_OUTPUT_NODE
#define PW_KEY_LINK_OUTPUT_NODE
output node id of a link
Definition keys.h:314
PW_TYPE_INTERFACE_Link
#define PW_TYPE_INTERFACE_Link
Definition link.h:37
PW_VERSION_LINK
#define PW_VERSION_LINK
Definition link.h:43
pw_loop_iterate
#define pw_loop_iterate(l,...)
Definition loop.h:53
pw_loop_invoke
#define pw_loop_invoke(l,...)
Definition loop.h:47
pw_main_loop_quit
int pw_main_loop_quit(struct pw_main_loop *loop)
Quit a main loop.
Definition main-loop.c:106
pw_main_loop_destroy
void pw_main_loop_destroy(struct pw_main_loop *loop)
Destroy a loop.
Definition main-loop.c:71
pw_main_loop_run
int pw_main_loop_run(struct pw_main_loop *loop)
Run a main loop.
Definition main-loop.c:120
pw_main_loop_new
struct pw_main_loop * pw_main_loop_new(const struct spa_dict *props)
Create a new main loop.
Definition main-loop.c:61
pw_main_loop_get_loop
struct pw_loop * pw_main_loop_get_loop(struct pw_main_loop *loop)
Get the loop implementation.
Definition main-loop.c:94
PW_TYPE_INTERFACE_Node
#define PW_TYPE_INTERFACE_Node
Definition node.h:35
PW_VERSION_NODE
#define PW_VERSION_NODE
Definition node.h:41
pw_init
void pw_init(int *argc, char **argv[])
Initialize PipeWire.
Definition pipewire.c:556
pw_deinit
void pw_deinit(void)
Deinitialize PipeWire.
Definition pipewire.c:669
pw_properties_free
void pw_properties_free(struct pw_properties *properties)
Free a properties object.
Definition properties.c:351
pw_properties_new
struct pw_properties * pw_properties_new(const char *key,...)
Make a new properties object.
Definition properties.c:85
pw_properties_setf
int pw_properties_setf(struct pw_properties *properties, const char *key, const char *format,...)
Set a property value by format.
Definition properties.c:453
pw_properties_clear
void pw_properties_clear(struct pw_properties *properties)
Clear a properties object.
Definition properties.c:264
pw_proxy_get_bound_id
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:150
pw_proxy_destroy
void pw_proxy_destroy(struct pw_proxy *proxy)
destroy a proxy
Definition proxy.c:206
SPA_META_Header
@ SPA_META_Header
struct spa_meta_header
Definition meta.h:27
SPA_DATA_MemFd
@ SPA_DATA_MemFd
generic fd, mmap to get to memory
Definition buffer.h:35
SPA_DATA_MemPtr
@ SPA_DATA_MemPtr
pointer to memory, the data field in struct spa_data is set.
Definition buffer.h:33
SPA_DATA_DmaBuf
@ SPA_DATA_DmaBuf
fd to dmabuf memory
Definition buffer.h:36
spa_debug_format
static int spa_debug_format(int indent, const struct spa_type_info *info, const struct spa_pod *format)
Definition format.h:206
SPA_KEY_FACTORY_NAME
#define SPA_KEY_FACTORY_NAME
the name of a factory
Definition plugin.h:202
SPA_KEY_LIBRARY_NAME
#define SPA_KEY_LIBRARY_NAME
the name of a library.
Definition plugin.h:211
spa_hook_list_join
static void spa_hook_list_join(struct spa_hook_list *list, struct spa_hook_list *save)
Definition hook.h:422
spa_hook_list_init
static void spa_hook_list_init(struct spa_hook_list *list)
Initialize a hook list to the empty list.
Definition hook.h:360
spa_hook_list_isolate
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:408
SPA_INTERFACE_INIT
#define SPA_INTERFACE_INIT(_type, _version, _funcs, _data)
Initialize a spa_interface.
Definition hook.h:157
SPA_NAME_API_V4L2_SOURCE
#define SPA_NAME_API_V4L2_SOURCE
a v4l2 Node interface for capturing
Definition names.h:163
SPA_PORT_CHANGE_MASK_FLAGS
#define SPA_PORT_CHANGE_MASK_FLAGS
Definition node.h:95
spa_node_emit_port_info
#define spa_node_emit_port_info(hooks,...)
Definition utils.h:118
SPA_PORT_INFO_INIT
#define SPA_PORT_INFO_INIT()
Definition node.h:139
SPA_TYPE_INTERFACE_Node
#define SPA_TYPE_INTERFACE_Node
Definition node.h:37
SPA_STATUS_NEED_DATA
#define SPA_STATUS_NEED_DATA
Definition io.h:82
SPA_VERSION_NODE
#define SPA_VERSION_NODE
Definition node.h:40
SPA_PORT_CHANGE_MASK_PARAMS
#define SPA_PORT_CHANGE_MASK_PARAMS
Definition node.h:101
SPA_RESULT_TYPE_NODE_PARAMS
#define SPA_RESULT_TYPE_NODE_PARAMS
Definition node.h:144
spa_node_emit_result
#define spa_node_emit_result(hooks,...)
Definition utils.h:119
SPA_VERSION_NODE_METHODS
#define SPA_VERSION_NODE_METHODS
Definition node.h:331
SPA_IO_Buffers
@ SPA_IO_Buffers
area to exchange buffers, struct spa_io_buffers
Definition io.h:38
SPA_PARAM_INFO_WRITE
#define SPA_PARAM_INFO_WRITE
Definition param.h:59
SPA_PARAM_INFO_READ
#define SPA_PARAM_INFO_READ
Definition param.h:57
SPA_PARAM_INFO_READWRITE
#define SPA_PARAM_INFO_READWRITE
Definition param.h:61
spa_format_video_raw_parse
static int spa_format_video_raw_parse(const struct spa_pod *format, struct spa_video_info_raw *info)
Definition raw-utils.h:27
SPA_PARAM_INFO
#define SPA_PARAM_INFO(id, flags)
Definition param.h:71
SPA_PARAM_META_size
@ SPA_PARAM_META_size
the expected maximum size the meta (Int)
Definition buffers.h:39
SPA_PARAM_META_type
@ SPA_PARAM_META_type
the metadata, one of enum spa_meta_type (Id enum spa_meta_type)
Definition buffers.h:38
SPA_PARAM_Format
@ SPA_PARAM_Format
configured format as SPA_TYPE_OBJECT_Format
Definition param.h:34
SPA_PARAM_Meta
@ SPA_PARAM_Meta
allowed metadata for buffers as SPA_TYPE_OBJECT_ParamMeta
Definition param.h:36
SPA_PARAM_EnumFormat
@ SPA_PARAM_EnumFormat
available formats as SPA_TYPE_OBJECT_Format
Definition param.h:33
SPA_PARAM_Buffers
@ SPA_PARAM_Buffers
buffer configurations as SPA_TYPE_OBJECT_ParamBuffers
Definition param.h:35
SPA_PARAM_BUFFERS_size
@ SPA_PARAM_BUFFERS_size
size of a data block memory (Int)
Definition buffers.h:29
SPA_PARAM_BUFFERS_stride
@ SPA_PARAM_BUFFERS_stride
stride of data block memory (Int)
Definition buffers.h:30
SPA_PARAM_BUFFERS_blocks
@ SPA_PARAM_BUFFERS_blocks
number of data blocks per buffer (Int)
Definition buffers.h:28
SPA_PARAM_BUFFERS_buffers
@ SPA_PARAM_BUFFERS_buffers
number of buffers (Int)
Definition buffers.h:27
SPA_POD_CHOICE_RANGE_Int
#define SPA_POD_CHOICE_RANGE_Int(def, min, max)
Definition vararg.h:58
SPA_POD_Id
#define SPA_POD_Id(val)
Definition vararg.h:49
spa_pod_builder_add_object
#define spa_pod_builder_add_object(b, type, id,...)
Definition builder.h:659
spa_pod_builder_init
static void spa_pod_builder_init(struct spa_pod_builder *builder, void *data, uint32_t size)
Definition builder.h:87
SPA_POD_Int
#define SPA_POD_Int(val)
Definition vararg.h:54
spa_pod_filter
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:431
SPA_TYPE_OBJECT_ParamBuffers
@ SPA_TYPE_OBJECT_ParamBuffers
Definition type.h:77
SPA_TYPE_OBJECT_ParamMeta
@ SPA_TYPE_OBJECT_ParamMeta
Definition type.h:78
SPA_MIN
#define SPA_MIN(a, b)
Definition defs.h:151
spa_zero
#define spa_zero(x)
Definition defs.h:421
SPA_ID_INVALID
#define SPA_ID_INVALID
Definition defs.h:232
SPA_N_ELEMENTS
#define SPA_N_ELEMENTS(arr)
Definition defs.h:129
spa_direction
spa_direction
Definition defs.h:92
SPA_PTROFF
#define SPA_PTROFF(ptr_, offset_, type_)
Return the address (buffer + offset) as pointer of type.
Definition defs.h:198
SPA_DIRECTION_INPUT
@ SPA_DIRECTION_INPUT
Definition defs.h:93
impl.h
pipewire/impl.h
io.h
spa/node/io.h
names.h
spa/utils/names.h
props.h
utils.h
filter.h
spa/pod/filter.h
pw_context
pw_core
pw_main_loop
A main loop object.
pw_properties
Definition properties.h:33
pw_properties::dict
struct spa_dict dict
dictionary of key/values
Definition properties.h:34
pw_proxy
spa_buffer
A Buffer.
Definition buffer.h:94
spa_buffer::datas
struct spa_data * datas
array of data members
Definition buffer.h:98
spa_chunk::stride
int32_t stride
stride of valid data
Definition buffer.h:49
spa_command
Definition command.h:29
spa_data::chunk
struct spa_chunk * chunk
valid chunk of memory
Definition buffer.h:90
spa_data::fd
int64_t fd
optional fd for data
Definition buffer.h:86
spa_data::mapoffset
uint32_t mapoffset
offset to map fd at
Definition buffer.h:87
spa_data::data
void * data
optional data pointer
Definition buffer.h:89
spa_data::maxsize
uint32_t maxsize
max size of data
Definition buffer.h:88
spa_data::type
uint32_t type
memory type, one of enum spa_data_type, when allocating memory, the type contains a bitmask of allowe...
Definition buffer.h:63
spa_hook_list
A list of hooks.
Definition hook.h:339
spa_hook
A hook, contains the structure with functions and the data passed to the functions.
Definition hook.h:350
spa_io_buffers
IO area to exchange buffers.
Definition io.h:78
spa_loop
Definition loop.h:36
spa_meta_header
Describes essential buffer header metadata such as flags and timestamps.
Definition meta.h:67
spa_node_callbacks
Node callbacks.
Definition node.h:232
spa_node_events
events from the spa_node.
Definition node.h:176
spa_node_methods
Node methods.
Definition node.h:327
spa_node_methods::add_listener
int(* add_listener)(void *object, struct spa_hook *listener, const struct spa_node_events *events, void *data)
Adds an event listener on node.
Definition node.h:348
spa_node
Definition node.h:41
spa_param_info
information about a parameter
Definition param.h:51
spa_pod_builder
Definition builder.h:53
spa_pod
Definition pod.h:43
spa_port_info
Port information structure.
Definition node.h:93
spa_result_node_params
the result of enum_params or port_enum_params.
Definition node.h:152
spa_result_node_params::param
struct spa_pod * param
the result param
Definition node.h:156
spa_result_node_params::next
uint32_t next
next index of iteration
Definition node.h:155
spa_result_node_params::id
uint32_t id
id of parameter
Definition node.h:153
spa_video_info_raw
Definition raw.h:176