PipeWire  0.3.58
export-source.c

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

/* 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]
Exporting and implementing a video source SPA node, using \ref api_pw_core.
[title]
*/
#include <errno.h>
#include <stdio.h>
#include <math.h>
#include <sys/mman.h>
#include <spa/node/io.h>
#include <spa/node/utils.h>
#include <spa/pod/filter.h>
#define M_PI_M2 ( M_PI + M_PI )
#define BUFFER_SAMPLES 128
struct buffer {
uint32_t id;
struct spa_buffer *buffer;
struct spa_list link;
void *ptr;
bool mapped;
};
struct data {
const char *path;
struct pw_main_loop *loop;
struct pw_context *context;
struct pw_core *core;
struct spa_hook core_listener;
uint64_t info_all;
struct spa_port_info info;
struct spa_dict_item items[1];
struct spa_dict dict;
struct spa_param_info params[5];
struct spa_node impl_node;
struct spa_hook_list hooks;
struct spa_io_buffers *io;
struct spa_io_control *io_notify;
uint32_t io_notify_size;
struct buffer buffers[32];
uint32_t n_buffers;
struct spa_list empty;
double accumulator;
double volume_accum;
};
static void update_volume(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_float(&b, (sin(data->volume_accum) / 2.0) + 0.5);
spa_pod_builder_pop(&b, &f[1]);
spa_pod_builder_pop(&b, &f[0]);
data->volume_accum += M_PI_M2 / 1000.0;
if (data->volume_accum >= M_PI_M2)
data->volume_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 = d->info_all;
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) {
d->io = data;
break;
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;
result.index = result.next++;
spa_pod_builder_init(&b, buffer, sizeof(buffer));
switch (id) {
if (result.index != 0)
return 0;
break;
if (result.index != 0)
return 0;
if (d->format.format == 0)
return 0;
param = spa_format_audio_raw_build(&b, id, &d->format);
break;
if (result.index > 0)
return 0;
BUFFER_SAMPLES * sizeof(float), 32, INT32_MAX),
break;
switch (result.index) {
case 0:
break;
default:
return 0;
}
break;
switch (result.index) {
case 0:
break;
case 1:
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;
d->info.change_mask = SPA_PORT_CHANGE_MASK_PARAMS;
if (format == NULL) {
d->format.format = 0;
d->params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
return 0;
}
spa_debug_format(0, NULL, format);
if (spa_format_audio_raw_parse(format, &d->format) < 0)
return -EINVAL;
if (d->format.format != SPA_AUDIO_FORMAT_S16 &&
d->format.format != SPA_AUDIO_FORMAT_F32)
return -EINVAL;
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++) {
struct buffer *b = &d->buffers[i];
struct spa_data *datas = buffers[i]->datas;
if (datas[0].data != NULL) {
b->ptr = datas[0].data;
b->mapped = false;
}
else if (datas[0].type == SPA_DATA_MemFd ||
datas[0].type == SPA_DATA_DmaBuf) {
b->ptr = mmap(NULL, datas[0].maxsize + datas[0].mapoffset, PROT_WRITE,
MAP_SHARED, datas[0].fd, 0);
if (b->ptr == MAP_FAILED) {
pw_log_error("failed to buffer mem");
return -errno;
}
b->ptr = SPA_PTROFF(b->ptr, datas[0].mapoffset, void);
b->mapped = true;
}
else {
pw_log_error("invalid buffer mem");
return -EINVAL;
}
b->id = i;
b->buffer = buffers[i];
pw_log_debug("got buffer %d size %d", i, datas[0].maxsize);
spa_list_append(&d->empty, &b->link);
}
d->n_buffers = n_buffers;
return 0;
}
static inline void reuse_buffer(struct data *d, uint32_t id)
{
pw_log_trace("export-source %p: recycle buffer %d", d, id);
spa_list_append(&d->empty, &d->buffers[id].link);
}
static int impl_port_reuse_buffer(void *object, uint32_t port_id, uint32_t buffer_id)
{
struct data *d = object;
reuse_buffer(d, buffer_id);
return 0;
}
static void fill_f32(struct data *d, void *dest, int avail)
{
float *dst = dest;
int n_samples = avail / (sizeof(float) * d->format.channels);
int i;
uint32_t c;
for (i = 0; i < n_samples; i++) {
float val;
d->accumulator += M_PI_M2 * 440 / d->format.rate;
if (d->accumulator >= M_PI_M2)
d->accumulator -= M_PI_M2;
val = sin(d->accumulator);
for (c = 0; c < d->format.channels; c++)
*dst++ = val;
}
}
static void fill_s16(struct data *d, void *dest, int avail)
{
int16_t *dst = dest;
int n_samples = avail / (sizeof(int16_t) * d->format.channels);
int i;
uint32_t c;
for (i = 0; i < n_samples; i++) {
int16_t val;
d->accumulator += M_PI_M2 * 440 / d->format.rate;
if (d->accumulator >= M_PI_M2)
d->accumulator -= M_PI_M2;
val = (int16_t) (sin(d->accumulator) * 32767.0);
for (c = 0; c < d->format.channels; c++)
*dst++ = val;
}
}
static int impl_node_process(void *object)
{
struct data *d = object;
struct buffer *b;
int avail;
struct spa_io_buffers *io = d->io;
uint32_t maxsize, index = 0;
uint32_t filled, offset;
struct spa_data *od;
if (io->buffer_id < d->n_buffers) {
reuse_buffer(d, io->buffer_id);
}
if (spa_list_is_empty(&d->empty)) {
pw_log_error("export-source %p: out of buffers", d);
return -EPIPE;
}
b = spa_list_first(&d->empty, struct buffer, link);
spa_list_remove(&b->link);
od = b->buffer->datas;
maxsize = od[0].maxsize;
filled = 0;
index = 0;
avail = maxsize - filled;
offset = index % maxsize;
if (offset + avail > maxsize)
avail = maxsize - offset;
if (d->format.format == SPA_AUDIO_FORMAT_S16)
fill_s16(d, SPA_PTROFF(b->ptr, offset, void), avail);
else if (d->format.format == SPA_AUDIO_FORMAT_F32)
fill_f32(d, SPA_PTROFF(b->ptr, offset, void), avail);
od[0].chunk->offset = 0;
od[0].chunk->size = avail;
od[0].chunk->stride = 0;
io->buffer_id = b->id;
update_volume(d);
}
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,
.port_reuse_buffer = impl_port_reuse_buffer,
.process = impl_node_process,
};
static void make_node(struct data *data)
{
struct pw_properties *props;
PW_KEY_MEDIA_CATEGORY, "Playback",
NULL);
if (data->path)
data->impl_node.iface = SPA_INTERFACE_INIT(
&impl_node, data);
&props->dict, &data->impl_node, 0);
}
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)
}
static const struct pw_core_events 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;
data.info_all = SPA_PORT_CHANGE_MASK_FLAGS |
data.info = SPA_PORT_INFO_INIT();
data.info.flags = 0;
data.items[0] = SPA_DICT_ITEM_INIT(PW_KEY_FORMAT_DSP, "32 bit float mono audio");
data.dict = SPA_DICT_INIT_ARRAY(data.items);
data.info.props = &data.dict;
data.params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
data.info.params = data.params;
data.info.n_params = 5;
spa_list_init(&data.empty);
spa_hook_list_init(&data.hooks);
if ((data.core = pw_context_connect(data.context, NULL, 0)) == NULL) {
printf("can't connect: %m\n");
return -1;
}
pw_core_add_listener(data.core, &data.core_listener, &core_events, &data);
make_node(&data);
pw_main_loop_run(data.loop);
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:399
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:188
#define PW_ID_CORE
default ID for the core object after connect
Definition: core.h:79
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:402
#define pw_core_add_listener(c,...)
Definition: core.h:363
#define PW_VERSION_CORE_EVENTS
Definition: core.h:143
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
#define PW_KEY_MEDIA_TYPE
Media.
Definition: keys.h:438
#define PW_KEY_NODE_AUTOCONNECT
node wants to be automatically connected to a compatible node
Definition: keys.h:218
#define PW_KEY_TARGET_OBJECT
a target object to link to
Definition: keys.h:508
#define PW_KEY_MEDIA_ROLE
Role: Movie, Music, Camera, Screen, Communication, Game, Notification, DSP, Production,...
Definition: keys.h:444
#define PW_KEY_NODE_EXCLUSIVE
node wants exclusive access to resources
Definition: keys.h:216
#define PW_KEY_MEDIA_CATEGORY
Media Category: Playback, Capture, Duplex, Monitor, Manager.
Definition: keys.h:441
#define PW_KEY_FORMAT_DSP
format related properties
Definition: keys.h:479
#define pw_log_trace(...)
Definition: log.h:166
#define pw_log_debug(...)
Definition: log.h:165
#define pw_log_error(...)
Definition: log.h:162
struct pw_main_loop * pw_main_loop_new(const struct spa_dict *props)
Create a new main loop.
Definition: main-loop.c:80
int pw_main_loop_quit(struct pw_main_loop *loop)
Quit a main loop.
Definition: main-loop.c:125
void pw_main_loop_destroy(struct pw_main_loop *loop)
Destroy a loop.
Definition: main-loop.c:90
int pw_main_loop_run(struct pw_main_loop *loop)
Run a main loop.
Definition: main-loop.c:139
struct pw_loop * pw_main_loop_get_loop(struct pw_main_loop *loop)
Get the loop implementation.
Definition: main-loop.c:113
void pw_init(int *argc, char **argv[])
Initialize PipeWire.
Definition: pipewire.c:580
void pw_properties_free(struct pw_properties *properties)
Free a properties object.
Definition: properties.c:368
struct pw_properties * pw_properties_new(const char *key,...) 1
Make a new properties object.
Definition: properties.c:102
int pw_properties_set(struct pw_properties *properties, const char *key, const char *value)
Set a property value.
Definition: properties.c:439
@ 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_DmaBuf
fd to dmabuf memory
Definition: buffer.h:55
@ SPA_CONTROL_Properties
data contains a SPA_TYPE_OBJECT_Props
Definition: control.h:52
static int spa_debug_format(int indent, const struct spa_type_info *info, const struct spa_pod *format)
Definition: format.h:122
#define SPA_DICT_ITEM_INIT(key, value)
Definition: dict.h:57
#define SPA_DICT_INIT_ARRAY(items)
Definition: dict.h:70
static void spa_hook_list_join(struct spa_hook_list *list, struct spa_hook_list *save)
Definition: hook.h:423
static void spa_hook_list_init(struct spa_hook_list *list)
Initialize a hook list to the empty list.
Definition: hook.h:361
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:409
#define SPA_INTERFACE_INIT(_type, _version, _funcs, _data)
Initialize a spa_interface.
Definition: hook.h:177
static void spa_list_init(struct spa_list *list)
Definition: list.h:55
static void spa_list_remove(struct spa_list *elem)
Definition: list.h:85
#define spa_list_first(head, type, member)
Definition: list.h:91
#define spa_list_is_empty(l)
Definition: list.h:65
#define spa_list_append(list, item)
Definition: list.h:97
#define SPA_PORT_CHANGE_MASK_FLAGS
Definition: node.h:115
#define SPA_PORT_CHANGE_MASK_PROPS
Definition: node.h:119
#define spa_node_emit_port_info(hooks,...)
Definition: utils.h:138
#define SPA_PORT_INFO_INIT()
Definition: node.h:159
#define SPA_STATUS_HAVE_DATA
Definition: io.h:104
#define SPA_TYPE_INTERFACE_Node
Definition: node.h:57
#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_Notify
area for notify messages, struct spa_io_sequence
Definition: io.h:63
@ SPA_IO_Buffers
area to exchange buffers, struct spa_io_buffers
Definition: io.h:58
#define SPA_PARAM_INFO_WRITE
Definition: param.h:78
static struct spa_pod * spa_format_audio_raw_build(struct spa_pod_builder *builder, uint32_t id, struct spa_audio_info_raw *info)
Definition: format-utils.h:108
static int spa_format_audio_raw_parse(const struct spa_pod *format, struct spa_audio_info_raw *info)
Definition: format-utils.h:48
#define SPA_PARAM_INFO_READ
Definition: param.h:76
#define SPA_PARAM_INFO_READWRITE
Definition: param.h:80
#define SPA_PARAM_INFO(id, flags)
Definition: param.h:88
@ SPA_PROP_volume
a volume (Float), 0.0 silence, 1.0 normal
Definition: props.h:86
@ 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_MEDIA_TYPE_audio
Definition: format.h:47
@ 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_IO
configurable IO areas as SPA_TYPE_OBJECT_ParamIO
Definition: param.h:57
@ 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_FORMAT_mediaType
media type (Id enum spa_media_type)
Definition: format.h:109
@ SPA_FORMAT_AUDIO_rate
sample rate (Int)
Definition: format.h:116
@ SPA_FORMAT_mediaSubtype
media subtype (Id enum spa_media_subtype)
Definition: format.h:110
@ SPA_FORMAT_AUDIO_format
audio format, (Id enum spa_audio_format)
Definition: format.h:114
@ SPA_FORMAT_AUDIO_channels
number of audio channels (Int)
Definition: format.h:117
@ SPA_MEDIA_SUBTYPE_raw
Definition: format.h:58
@ SPA_PARAM_IO_id
type ID, uniquely identifies the io area (Id enum spa_io_type)
Definition: param.h:111
@ SPA_PARAM_IO_size
size of the io area (Int)
Definition: param.h:112
@ SPA_AUDIO_FORMAT_S16P
Definition: raw.h:94
@ SPA_AUDIO_FORMAT_F32P
Definition: raw.h:98
@ SPA_AUDIO_FORMAT_S16
Definition: raw.h:114
@ SPA_AUDIO_FORMAT_F32
Definition: raw.h:126
@ 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_blocks
number of data blocks per buffer (Int)
Definition: param.h:94
@ SPA_PARAM_BUFFERS_buffers
number of buffers (Int)
Definition: param.h:93
static int spa_pod_builder_prop(struct spa_pod_builder *builder, uint32_t key, uint32_t flags)
Definition: builder.h:470
static int spa_pod_builder_float(struct spa_pod_builder *builder, float val)
Definition: builder.h:285
#define SPA_POD_CHOICE_ENUM_Id(n_vals,...)
Definition: vararg.h:71
static void * spa_pod_builder_pop(struct spa_pod_builder *builder, struct spa_pod_frame *frame)
Definition: builder.h:188
#define SPA_POD_CHOICE_RANGE_Int(def, min, max)
Definition: vararg.h:78
static int spa_pod_builder_push_sequence(struct spa_pod_builder *builder, struct spa_pod_frame *frame, uint32_t unit)
Definition: builder.h:480
#define SPA_POD_Id(val)
Definition: vararg.h:69
static uint32_t spa_pod_builder_control(struct spa_pod_builder *builder, uint32_t offset, uint32_t type)
Definition: builder.h:491
#define spa_pod_builder_add_object(b, type, id,...)
Definition: builder.h:679
static void spa_pod_builder_init(struct spa_pod_builder *builder, void *data, uint32_t size)
Definition: builder.h:107
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:455
#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
#define spa_strerror(err)
Definition: result.h:69
@ SPA_TYPE_OBJECT_ParamBuffers
Definition: type.h:97
@ SPA_TYPE_OBJECT_ParamIO
Definition: type.h:99
@ SPA_TYPE_OBJECT_Props
Definition: type.h:95
@ SPA_TYPE_OBJECT_ParamMeta
Definition: type.h:98
@ SPA_TYPE_OBJECT_Format
Definition: type.h:96
#define SPA_ID_INVALID
Definition: defs.h:240
spa_direction
Definition: defs.h:107
#define SPA_PTROFF(ptr_, offset_, type_)
Return the address (buffer + offset) as pointer of type.
Definition: defs.h:206
@ SPA_DIRECTION_OUTPUT
Definition: defs.h:109
spa/node/io.h
pipewire/pipewire.h
spa/utils/result.h
spa/pod/filter.h
Core events.
Definition: core.h:141
A main loop object.
Definition: properties.h:53
struct spa_dict dict
dictionary of key/values
Definition: properties.h:54
Audio information description.
Definition: raw.h:298
enum spa_audio_format format
Definition: raw.h:299
A Buffer.
Definition: buffer.h:109
struct spa_data * datas
array of data members
Definition: buffer.h:113
int32_t stride
stride of valid data
Definition: buffer.h:68
uint32_t size
size of valid data.
Definition: buffer.h:66
uint32_t offset
offset of valid data.
Definition: buffer.h:63
Definition: command.h:49
Data for a buffer this stays constant for a buffer.
Definition: buffer.h:81
struct spa_chunk * chunk
valid chunk of memory
Definition: buffer.h:105
int64_t fd
optional fd for data
Definition: buffer.h:101
uint32_t mapoffset
offset to map fd at
Definition: buffer.h:102
void * data
optional data pointer
Definition: buffer.h:104
uint32_t maxsize
max size of data
Definition: buffer.h:103
uint32_t type
memory type, one of enum spa_data_type, when allocating memory, the type contains a bitmask of allowe...
Definition: buffer.h:82
Definition: dict.h:51
Definition: dict.h:59
A list of hooks.
Definition: hook.h:340
A hook, contains the structure with functions and the data passed to the functions.
Definition: hook.h:351
IO area to exchange buffers.
Definition: io.h:98
int32_t status
the status code
Definition: io.h:109
uint32_t buffer_id
a buffer id
Definition: io.h:110
control stream, io area for SPA_IO_Control and SPA_IO_Notify
Definition: io.h:184
Definition: list.h:47
Describes essential buffer header metadata such as flags and timestamps.
Definition: meta.h:86
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: iter.h:47
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