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export-sink.c

Exporting and implementing a video sink SPA node, using Core API.

/* PipeWire */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */
/*
[title]
Exporting and implementing a video sink SPA node, using \ref api_pw_core.
[title]
*/
#include <errno.h>
#include <stdio.h>
#include <sys/mman.h>
#include <spa/utils/result.h>
#include <spa/param/video/format-utils.h>
#include <spa/param/props.h>
#include <spa/node/utils.h>
#include <spa/node/io.h>
#include <spa/pod/filter.h>
#include <spa/debug/format.h>
#include <spa/debug/pod.h>
#include <pipewire/pipewire.h>
#define WIDTH 640
#define HEIGHT 480
#define BPP 3
#include "sdl.h"
#define M_PI_M2 ( M_PI + M_PI )
#define MAX_BUFFERS 64
#define DEFAULT_PARAM 0.1
struct props {
double param;
};
static void reset_props(struct props *props)
{
props->param = DEFAULT_PARAM;
}
struct data {
struct props props;
const char *path;
SDL_Renderer *renderer;
SDL_Window *window;
SDL_Texture *texture;
struct pw_main_loop *loop;
struct pw_context *context;
struct pw_core *core;
struct spa_hook core_listener;
struct spa_node impl_node;
struct spa_hook_list hooks;
struct spa_io_buffers *io;
struct spa_io_sequence *io_notify;
uint32_t io_notify_size;
double param_accum;
uint8_t buffer[1024];
struct spa_video_info_raw format;
int32_t stride;
struct spa_port_info info;
struct spa_param_info params[5];
struct spa_region region;
struct spa_buffer *buffers[MAX_BUFFERS];
uint32_t n_buffers;
};
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 void update_param(struct data *data)
{
struct spa_pod_builder b = { 0, };
struct spa_pod_frame f[2];
if (data->io_notify == NULL)
return;
spa_pod_builder_init(&b, data->io_notify, data->io_notify_size);
spa_pod_builder_push_sequence(&b, &f[0], 0);
spa_pod_builder_control(&b, 0, SPA_CONTROL_Properties);
spa_pod_builder_push_object(&b, &f[1], SPA_TYPE_OBJECT_Props, 0);
spa_pod_builder_prop(&b, SPA_PROP_contrast, 0);
spa_pod_builder_float(&b, (sin(data->param_accum) * 127.0) + 127.0);
spa_pod_builder_pop(&b, &f[1]);
spa_pod_builder_pop(&b, &f[0]);
data->param_accum += M_PI_M2 / 30.0;
if (data->param_accum >= M_PI_M2)
data->param_accum -= M_PI_M2;
}
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;
uint64_t old;
spa_hook_list_isolate(&d->hooks, &save, listener, events, data);
old = d->info.change_mask;
d->info.change_mask = SPA_PORT_CHANGE_MASK_FLAGS |
SPA_PORT_CHANGE_MASK_PARAMS;
spa_node_emit_port_info(&d->hooks, SPA_DIRECTION_INPUT, 0, &d->info);
d->info.change_mask = old;
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_set_io(void *object,
uint32_t id, void *data, size_t size)
{
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;
switch (id) {
case SPA_IO_Buffers:
d->io = data;
break;
case SPA_IO_Notify:
d->io_notify = data;
d->io_notify_size = size;
break;
default:
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_Format:
if (result.index != 0 || d->format.format == 0)
return 0;
param = spa_format_video_raw_build(&b, id, &d->format);
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, 2, MAX_BUFFERS),
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:
switch (result.index) {
case 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;
case 1:
param = spa_pod_builder_add_object(&b,
SPA_TYPE_OBJECT_ParamMeta, id,
SPA_PARAM_META_type, SPA_POD_Id(SPA_META_VideoDamage),
SPA_PARAM_META_size, SPA_POD_Int(sizeof(struct spa_meta_region)));
break;
default:
return 0;
}
break;
case SPA_PARAM_IO:
switch (result.index) {
case 0:
param = spa_pod_builder_add_object(&b,
SPA_TYPE_OBJECT_ParamIO, id,
SPA_PARAM_IO_id, SPA_POD_Id(SPA_IO_Buffers),
SPA_PARAM_IO_size, SPA_POD_Int(sizeof(struct spa_io_buffers)));
break;
case 1:
param = spa_pod_builder_add_object(&b,
SPA_TYPE_OBJECT_ParamIO, id,
SPA_PARAM_IO_id, SPA_POD_Id(SPA_IO_Notify),
SPA_PARAM_IO_size, SPA_POD_Int(sizeof(struct spa_io_sequence) + 1024));
break;
default:
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) {
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[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_READWRITE);
d->params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, SPA_PARAM_INFO_READ);
} else {
d->params[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
d->params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
}
spa_node_emit_port_info(&d->hooks, direction, port_id, &d->info);
d->info.change_mask = 0;
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;
const struct spa_buffer *buf = *(struct spa_buffer**)_data;
uint8_t *map;
void *sdata, *ddata;
int sstride, dstride, ostride;
uint32_t i;
uint8_t *src, *dst;
struct spa_meta *m;
struct spa_meta_region *r;
handle_events(d);
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;
}
if ((m = spa_buffer_find_meta(buf, SPA_META_VideoDamage))) {
spa_meta_for_each(r, m) {
if (!spa_meta_region_is_valid(r))
break;
if (memcmp(&r->region, &d->region, sizeof(struct spa_region)) == 0)
break;
d->region = r->region;
fprintf(stderr, "region %dx%d->%dx%d\n",
r->region.position.x, r->region.position.y,
r->region.size.width, r->region.size.height);
}
}
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;
struct spa_buffer *buf;
int res;
if (d->io->status != SPA_STATUS_HAVE_DATA)
return SPA_STATUS_NEED_DATA;
if (d->io->buffer_id >= d->n_buffers)
return SPA_STATUS_NEED_DATA;
buf = d->buffers[d->io->buffer_id];
if ((res = pw_loop_invoke(pw_main_loop_get_loop(d->loop), do_render,
SPA_ID_INVALID, &buf, sizeof(struct spa_buffer *),
false, d)) < 0)
return res;
update_param(d);
return d->io->status = 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 void make_node(struct data *data)
{
struct pw_properties *props;
props = pw_properties_new(PW_KEY_NODE_AUTOCONNECT, "true", NULL);
if (data->path)
pw_properties_set(props, PW_KEY_TARGET_OBJECT, data->path);
pw_properties_set(props, PW_KEY_MEDIA_CLASS, "Stream/Input/Video");
pw_properties_set(props, PW_KEY_MEDIA_TYPE, "Video");
pw_properties_set(props, PW_KEY_MEDIA_CATEGORY, "Capture");
pw_properties_set(props, PW_KEY_MEDIA_ROLE, "Camera");
data->impl_node.iface = SPA_INTERFACE_INIT(
SPA_TYPE_INTERFACE_Node,
SPA_VERSION_NODE,
&impl_node, data);
pw_core_export(data->core, SPA_TYPE_INTERFACE_Node,
&props->dict, &data->impl_node, 0);
pw_properties_free(props);
}
static void set_permissions(struct data *data)
{
struct pw_permission permissions[2];
/* an example, set specific permissions on one object, this is the
* core object. */
permissions[0] = PW_PERMISSION_INIT(PW_ID_CORE, PW_PERM_R | PW_PERM_X);
/* remove WX from all other objects */
permissions[1] = PW_PERMISSION_INIT(PW_ID_ANY, PW_PERM_R);
pw_client_update_permissions(
pw_core_get_client(data->core),
2, permissions);
}
static void on_core_error(void *data, uint32_t id, int seq, int res, const char *message)
{
struct data *d = data;
pw_log_error("error id:%u seq:%d res:%d (%s): %s",
id, seq, res, spa_strerror(res), message);
if (id == PW_ID_CORE)
pw_main_loop_quit(d->loop);
}
static const struct pw_core_events core_events = {
PW_VERSION_CORE_EVENTS,
.error = on_core_error,
};
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), NULL, 0);
data.path = argc > 1 ? argv[1] : NULL;
spa_hook_list_init(&data.hooks);
data.info = SPA_PORT_INFO_INIT();
data.info.change_mask = SPA_PORT_CHANGE_MASK_FLAGS;
data.info.flags = 0;
data.info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
data.params[0] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
data.params[1] = SPA_PARAM_INFO(SPA_PARAM_Meta, SPA_PARAM_INFO_READ);
data.params[2] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
data.params[3] = SPA_PARAM_INFO(SPA_PARAM_Buffers, SPA_PARAM_INFO_READ);
data.params[4] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
data.info.params = data.params;
data.info.n_params = 5;
reset_props(&data.props);
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(data.context, NULL, 0);
if (data.core == NULL) {
printf("can't connect: %m\n");
return -1;
}
pw_core_add_listener(data.core, &data.core_listener, &core_events, &data);
set_permissions(&data);
make_node(&data);
pw_main_loop_run(data.loop);
pw_context_destroy(data.context);
pw_main_loop_destroy(data.loop);
return 0;
}
format.h
spa/debug/format.h
pod.h
spa/debug/pod.h
pw_client_update_permissions
#define pw_client_update_permissions(c,...)
Manage the permissions of the global objects for this client.
Definition client.h:196
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_ID_CORE
#define PW_ID_CORE
default ID for the core object after connect
Definition core.h:62
pw_context_connect
struct pw_core * pw_context_connect(struct pw_context *context, struct pw_properties *properties, size_t user_data_size)
Connect to a PipeWire instance.
Definition core.c:391
PW_ID_ANY
#define PW_ID_ANY
Definition core.h:66
pw_core_get_client
struct pw_client * pw_core_get_client(struct pw_core *core)
Get the client proxy of the connected core.
Definition core.c:254
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_add_listener
#define pw_core_add_listener(c,...)
Definition core.h:364
PW_VERSION_CORE_EVENTS
#define PW_VERSION_CORE_EVENTS
Definition core.h:128
PW_KEY_MEDIA_TYPE
#define PW_KEY_MEDIA_TYPE
Media.
Definition keys.h:438
PW_KEY_NODE_AUTOCONNECT
#define PW_KEY_NODE_AUTOCONNECT
node wants to be automatically connected to a compatible node
Definition keys.h:207
PW_KEY_TARGET_OBJECT
#define PW_KEY_TARGET_OBJECT
a target object to link to.
Definition keys.h:503
PW_KEY_MEDIA_ROLE
#define PW_KEY_MEDIA_ROLE
Role: Movie, Music, Camera, Screen, Communication, Game, Notification, DSP, Production,...
Definition keys.h:444
PW_KEY_MEDIA_CATEGORY
#define PW_KEY_MEDIA_CATEGORY
Media Category: Playback, Capture, Duplex, Monitor, Manager.
Definition keys.h:441
PW_KEY_MEDIA_CLASS
#define PW_KEY_MEDIA_CLASS
class Ex: "Video/Source"
Definition keys.h:449
pw_log_error
#define pw_log_error(...)
Definition log.h:131
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_PERM_X
#define PW_PERM_X
methods can be called on the object.
Definition permission.h:36
PW_PERM_R
#define PW_PERM_R
object can be seen and events can be received
Definition permission.h:32
PW_PERMISSION_INIT
#define PW_PERMISSION_INIT(id, p)
Definition permission.h:75
pw_init
void pw_init(int *argc, char **argv[])
Initialize PipeWire.
Definition pipewire.c:556
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_set
int pw_properties_set(struct pw_properties *properties, const char *key, const char *value)
Set a property value.
Definition properties.c:422
spa_meta_region_is_valid
#define spa_meta_region_is_valid
Definition meta.h:96
spa_buffer_find_meta
static struct spa_meta * spa_buffer_find_meta(const struct spa_buffer *b, uint32_t type)
Find metadata in a buffer.
Definition buffer.h:102
spa_meta_for_each
#define spa_meta_for_each(pos, meta)
iterate all the items in a metadata
Definition meta.h:99
SPA_META_VideoDamage
@ SPA_META_VideoDamage
array of struct spa_meta_region with damage, where an invalid entry or end-of-array marks the end.
Definition meta.h:29
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_CONTROL_Properties
@ SPA_CONTROL_Properties
data contains a SPA_TYPE_OBJECT_Props
Definition control.h:32
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_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_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_STATUS_HAVE_DATA
#define SPA_STATUS_HAVE_DATA
Definition io.h:84
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_Notify
@ SPA_IO_Notify
area for notify messages, struct spa_io_sequence
Definition io.h:43
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_build
static struct spa_pod * spa_format_video_raw_build(struct spa_pod_builder *builder, uint32_t id, struct spa_video_info_raw *info)
Definition raw-utils.h:58
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_PROP_contrast
@ SPA_PROP_contrast
Definition props.h:106
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_IO
@ SPA_PARAM_IO
configurable IO areas as SPA_TYPE_OBJECT_ParamIO
Definition param.h:37
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_IO_id
@ SPA_PARAM_IO_id
type ID, uniquely identifies the io area (Id enum spa_io_type)
Definition buffers.h:45
SPA_PARAM_IO_size
@ SPA_PARAM_IO_size
size of the io area (Int)
Definition buffers.h:46
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_builder_prop
static int spa_pod_builder_prop(struct spa_pod_builder *builder, uint32_t key, uint32_t flags)
Definition builder.h:450
spa_pod_builder_float
static int spa_pod_builder_float(struct spa_pod_builder *builder, float val)
Definition builder.h:265
SPA_POD_CHOICE_RANGE_Int
#define SPA_POD_CHOICE_RANGE_Int(def, min, max)
Definition vararg.h:58
spa_pod_builder_push_sequence
static int spa_pod_builder_push_sequence(struct spa_pod_builder *builder, struct spa_pod_frame *frame, uint32_t unit)
Definition builder.h:460
SPA_POD_Id
#define SPA_POD_Id(val)
Definition vararg.h:49
spa_pod_builder_pop
static void * spa_pod_builder_pop(struct spa_pod_builder *builder, struct spa_pod_frame *frame)
Definition builder.h:168
spa_pod_builder_control
static int spa_pod_builder_control(struct spa_pod_builder *builder, uint32_t offset, uint32_t type)
Definition builder.h:471
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_builder_push_object
static int spa_pod_builder_push_object(struct spa_pod_builder *builder, struct spa_pod_frame *frame, uint32_t type, uint32_t id)
Definition builder.h:435
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_strerror
#define spa_strerror(err)
Definition result.h:49
SPA_TYPE_OBJECT_ParamBuffers
@ SPA_TYPE_OBJECT_ParamBuffers
Definition type.h:77
SPA_TYPE_OBJECT_ParamIO
@ SPA_TYPE_OBJECT_ParamIO
Definition type.h:79
SPA_TYPE_OBJECT_Props
@ SPA_TYPE_OBJECT_Props
Definition type.h:75
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_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
io.h
spa/node/io.h
pipewire.h
pipewire/pipewire.h
props.h
result.h
spa/utils/result.h
utils.h
filter.h
spa/pod/filter.h
pw_context
pw_core_events
Core events.
Definition core.h:126
pw_core_events::error
void(* error)(void *data, uint32_t id, int seq, int res, const char *message)
Fatal error event.
Definition core.h:174
pw_core
pw_main_loop
A main loop object.
pw_permission
Definition permission.h:69
pw_permission::permissions
uint32_t permissions
bitmask of above permissions
Definition permission.h:71
pw_properties
Definition properties.h:33
pw_properties::dict
struct spa_dict dict
dictionary of key/values
Definition properties.h:34
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_io_sequence
control stream, io area for SPA_IO_Control and SPA_IO_Notify
Definition io.h:170
spa_loop
Definition loop.h:36
spa_meta_header
Describes essential buffer header metadata such as flags and timestamps.
Definition meta.h:67
spa_meta_region
metadata structure for Region or an array of these for RegionArray
Definition meta.h:89
spa_meta_region::region
struct spa_region region
Definition meta.h:90
spa_meta
A metadata element.
Definition meta.h:47
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_frame
Definition iter.h:27
spa_pod
Definition pod.h:43
spa_point::y
int32_t y
Definition defs.h:111
spa_point::x
int32_t x
Definition defs.h:110
spa_port_info
Port information structure.
Definition node.h:93
spa_rectangle::width
uint32_t width
Definition defs.h:103
spa_rectangle::height
uint32_t height
Definition defs.h:104
spa_region
Definition defs.h:116
spa_region::position
struct spa_point position
Definition defs.h:117
spa_region::size
struct spa_rectangle size
Definition defs.h:118
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