PipeWire: video-src-alloc.c

PipeWire 1.2.7

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video-src-alloc.c

Allocating buffer memory and sending fds to the server.

Allocating buffer memory and sending fds to the server.

/* PipeWire */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */
/*
[title]
Allocating buffer memory and sending fds to the server.
[title]
*/
#include "config.h"
#include <stdio.h>
#include <errno.h>
#include <signal.h>
#include <math.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <spa/param/video/format-utils.h>
#include <pipewire/pipewire.h>
#define BPP 3
#define CURSOR_WIDTH 64
#define CURSOR_HEIGHT 64
#define CURSOR_BPP 4
#define MAX_BUFFERS 64
#define M_PI_M2 ( M_PI + M_PI )
struct data {
struct pw_thread_loop *loop;
struct spa_source *timer;
struct pw_stream *stream;
struct spa_hook stream_listener;
struct spa_video_info_raw format;
int32_t stride;
int counter;
uint32_t seq;
double crop;
double accumulator;
};
static void draw_elipse(uint32_t *dst, int width, int height, uint32_t color)
{
int i, j, r1, r2, r12, r22, r122;
r1 = width/2;
r12 = r1 * r1;
r2 = height/2;
r22 = r2 * r2;
r122 = r12 * r22;
for (i = -r2; i < r2; i++) {
for (j = -r1; j < r1; j++) {
dst[(i + r2)*width+(j+r1)] =
(i * i * r12 + j * j * r22 <= r122) ? color : 0x00000000;
}
}
}
/* called when we should push a new buffer in the queue */
static void on_process(void *userdata)
{
struct data *data = userdata;
struct pw_buffer *b;
struct spa_buffer *buf;
uint32_t i, j;
uint8_t *p;
struct spa_meta *m;
struct spa_meta_header *h;
struct spa_meta_region *mc;
struct spa_meta_cursor *mcs;
if ((b = pw_stream_dequeue_buffer(data->stream)) == NULL) {
pw_log_warn("out of buffers: %m");
return;
}
buf = b->buffer;
if ((p = buf->datas[0].data) == NULL)
return;
if ((h = spa_buffer_find_meta_data(buf, SPA_META_Header, sizeof(*h)))) {
#if 0
h->pts = pw_stream_get_nsec(data->stream));
#else
h->pts = -1;
#endif
h->flags = 0;
h->seq = data->seq++;
h->dts_offset = 0;
}
if ((m = spa_buffer_find_meta(buf, SPA_META_VideoDamage))) {
struct spa_meta_region *r = spa_meta_first(m);
if (spa_meta_check(r, m)) {
r->region. position = SPA_POINT(0,0);
r->region. size = data->format.size;
r++;
}
if (spa_meta_check(r, m))
r->region = SPA_REGION(0,0,0,0);
}
if ((mc = spa_buffer_find_meta_data(buf, SPA_META_VideoCrop, sizeof(*mc)))) {
data->crop = (sin(data->accumulator) + 1.0) * 32.0;
mc->region.position. x = (int32_t)data->crop;
mc->region.position. y = (int32_t)data->crop;
mc->region.size. width = data->format.size.width - (int32_t)(data->crop*2);
mc->region.size. height = data->format.size.height - (int32_t)(data->crop*2);
}
if ((mcs = spa_buffer_find_meta_data(buf, SPA_META_Cursor, sizeof(*mcs)))) {
struct spa_meta_bitmap *mb;
uint32_t *bitmap, color;
mcs->id = 1;
mcs->position.x = (int32_t)((sin(data->accumulator) + 1.0) * 160.0 + 80);
mcs->position.y = (int32_t)((cos(data->accumulator) + 1.0) * 100.0 + 50);
mcs->hotspot.x = 0;
mcs->hotspot.y = 0;
mcs->bitmap_offset = sizeof(struct spa_meta_cursor);
mb = SPA_PTROFF(mcs, mcs->bitmap_offset, struct spa_meta_bitmap);
mb->format = SPA_VIDEO_FORMAT_ARGB;
mb->size.width = CURSOR_WIDTH;
mb->size.height = CURSOR_HEIGHT;
mb->stride = CURSOR_WIDTH * CURSOR_BPP;
mb->offset = sizeof(struct spa_meta_bitmap);
bitmap = SPA_PTROFF(mb, mb->offset, uint32_t);
color = (uint32_t)((cos(data->accumulator) + 1.0) * (1 << 23));
color |= 0xff000000;
draw_elipse(bitmap, mb->size.width, mb->size.height, color);
}
for (i = 0; i < data->format.size.height; i++) {
for (j = 0; j < data->format.size.width * BPP; j++) {
p[j] = data->counter + j * i;
}
p += data->stride;
data->counter += 13;
}
data->accumulator += M_PI_M2 / 50.0;
if (data->accumulator >= M_PI_M2)
data->accumulator -= M_PI_M2;
buf->datas[0].chunk->offset = 0;
buf->datas[0].chunk->size = data->format.size.height * data->stride;
buf->datas[0].chunk->stride = data->stride;
pw_stream_queue_buffer(data->stream, b);
}
/* trigger the graph when we are a driver */
static void on_timeout(void *userdata, uint64_t expirations)
{
struct data *data = userdata;
pw_log_trace("timeout");
pw_stream_trigger_process(data->stream);
}
/* when the stream is STREAMING, start the timer at 40ms intervals
* to produce and push a frame. In other states we PAUSE the timer. */
static void on_stream_state_changed(void *_data, enum pw_stream_state old, enum pw_stream_state state,
const char *error)
{
struct data *data = _data;
printf("stream state: \"%s\"\n", pw_stream_state_as_string(state));
switch (state) {
case PW_STREAM_STATE_PAUSED:
printf("node id: %d\n", pw_stream_get_node_id(data->stream));
pw_loop_update_timer(pw_thread_loop_get_loop(data->loop),
data->timer, NULL, NULL, false);
break;
case PW_STREAM_STATE_STREAMING:
{
struct timespec timeout, interval;
timeout.tv_sec = 0;
timeout.tv_nsec = 1;
interval.tv_sec = 0;
interval.tv_nsec = 40 * SPA_NSEC_PER_MSEC;
if (pw_stream_is_driving(data->stream))
pw_loop_update_timer(pw_thread_loop_get_loop(data->loop),
data->timer, &timeout, &interval, false);
break;
}
default:
break;
}
}
/* we set the PW_STREAM_FLAG_ALLOC_BUFFERS flag when connecting so we need
* to provide buffer memory. */
static void on_stream_add_buffer(void *_data, struct pw_buffer *buffer)
{
struct data *data = _data;
struct spa_buffer *buf = buffer->buffer;
struct spa_data *d;
#ifdef HAVE_MEMFD_CREATE
unsigned int seals;
#endif
pw_log_info("add buffer %p", buffer);
d = buf->datas;
if ((d[0].type & (1<<SPA_DATA_MemFd)) == 0) {
pw_log_error("unsupported data type %08x", d[0].type);
return;
}
/* create the memfd on the buffer, set the type and flags */
d[0].type = SPA_DATA_MemFd;
d[0].flags = SPA_DATA_FLAG_READWRITE | SPA_DATA_FLAG_MAPPABLE;
#ifdef HAVE_MEMFD_CREATE
d[0].fd = memfd_create("video-src-memfd", MFD_CLOEXEC | MFD_ALLOW_SEALING);
#else
d[0].fd = -1;
#endif
if (d[0].fd == -1) {
pw_log_error("can't create memfd: %m");
return;
}
d[0].mapoffset = 0;
d[0].maxsize = data->stride * data->format.size.height;
/* truncate to the right size before we set seals */
if (ftruncate(d[0].fd, d[0].maxsize) < 0) {
pw_log_error("can't truncate to %d: %m", d[0].maxsize);
return;
}
#ifdef HAVE_MEMFD_CREATE
/* not enforced yet but server might require SEAL_SHRINK later */
seals = F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL;
if (fcntl(d[0].fd, F_ADD_SEALS, seals) == -1) {
pw_log_warn("Failed to add seals: %m");
}
#endif
/* now mmap so we can write to it in the process function above */
d[0].data = mmap(NULL, d[0].maxsize, PROT_READ|PROT_WRITE,
MAP_SHARED, d[0].fd, d[0].mapoffset);
if (d[0].data == MAP_FAILED) {
pw_log_error("can't mmap memory: %m");
return;
}
}
/* close the memfd we set on the buffers here */
static void on_stream_remove_buffer(void *_data, struct pw_buffer *buffer)
{
struct spa_buffer *buf = buffer->buffer;
struct spa_data *d;
d = buf->datas;
pw_log_info("remove buffer %p", buffer);
munmap(d[0].data, d[0].maxsize);
close(d[0].fd);
}
/* Be notified when the stream param changes. We're only looking at the
* format param.
*
* We are now supposed to call pw_stream_update_params() with success or
* failure, depending on if we can support the format. Because we gave
* a list of supported formats, this should be ok.
*
* As part of pw_stream_update_params() we can provide parameters that
* will control the buffer memory allocation. This includes the metadata
* that we would like on our buffer, the size, alignment, etc.
*/
static void
on_stream_param_changed(void *_data, uint32_t id, const struct spa_pod *param)
{
struct data *data = _data;
struct pw_stream *stream = data->stream;
uint8_t params_buffer[1024];
struct spa_pod_builder b = SPA_POD_BUILDER_INIT(params_buffer, sizeof(params_buffer));
const struct spa_pod *params[5];
if (param == NULL || id != SPA_PARAM_Format)
return;
spa_format_video_raw_parse(param, &data->format);
data->stride = SPA_ROUND_UP_N(data->format.size.width * BPP, 4);
params[0] = spa_pod_builder_add_object(&b,
SPA_TYPE_OBJECT_ParamBuffers, SPA_PARAM_Buffers,
SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(8, 2, MAX_BUFFERS),
SPA_PARAM_BUFFERS_blocks, SPA_POD_Int(1),
SPA_PARAM_BUFFERS_size, SPA_POD_Int(data->stride * data->format.size.height),
SPA_PARAM_BUFFERS_stride, SPA_POD_Int(data->stride),
SPA_PARAM_BUFFERS_dataType, SPA_POD_CHOICE_FLAGS_Int(1<<SPA_DATA_MemFd));
params[1] = spa_pod_builder_add_object(&b,
SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta,
SPA_PARAM_META_type, SPA_POD_Id(SPA_META_Header),
SPA_PARAM_META_size, SPA_POD_Int(sizeof(struct spa_meta_header)));
params[2] = spa_pod_builder_add_object(&b,
SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta,
SPA_PARAM_META_type, SPA_POD_Id(SPA_META_VideoDamage),
SPA_PARAM_META_size, SPA_POD_CHOICE_RANGE_Int(
sizeof(struct spa_meta_region) * 16,
sizeof(struct spa_meta_region) * 1,
sizeof(struct spa_meta_region) * 16));
params[3] = spa_pod_builder_add_object(&b,
SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta,
SPA_PARAM_META_type, SPA_POD_Id(SPA_META_VideoCrop),
SPA_PARAM_META_size, SPA_POD_Int(sizeof(struct spa_meta_region)));
#define CURSOR_META_SIZE(w,h) (sizeof(struct spa_meta_cursor) + \
sizeof(struct spa_meta_bitmap) + w * h * CURSOR_BPP)
params[4] = spa_pod_builder_add_object(&b,
SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta,
SPA_PARAM_META_type, SPA_POD_Id(SPA_META_Cursor),
SPA_PARAM_META_size, SPA_POD_Int(
CURSOR_META_SIZE(CURSOR_WIDTH,CURSOR_HEIGHT)));
pw_stream_update_params(stream, params, 5);
}
static const struct pw_stream_events stream_events = {
PW_VERSION_STREAM_EVENTS,
.process = on_process,
.state_changed = on_stream_state_changed,
.param_changed = on_stream_param_changed,
.add_buffer = on_stream_add_buffer,
.remove_buffer = on_stream_remove_buffer,
};
static void do_quit(void *userdata, int signal_number)
{
struct data *data = userdata;
pw_thread_loop_signal(data->loop, false);
}
int main(int argc, char *argv[])
{
struct data data = { 0, };
const struct spa_pod *params[1];
uint8_t buffer[1024];
struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
pw_init(&argc, &argv);
/* create a thread loop and start it */
data.loop = pw_thread_loop_new("video-src-alloc", NULL);
/* take the lock around all PipeWire functions. In callbacks, the lock
* is already taken for you but it's ok to lock again because the lock is
* recursive */
pw_thread_loop_lock(data.loop);
/* install some handlers to exit nicely */
pw_loop_add_signal(pw_thread_loop_get_loop(data.loop), SIGINT, do_quit, &data);
pw_loop_add_signal(pw_thread_loop_get_loop(data.loop), SIGTERM, do_quit, &data);
/* start after the signal handlers are set */
pw_thread_loop_start(data.loop);
/* create a simple stream, the simple stream manages the core
* object for you if you don't want to deal with them.
*
* We're making a new video provider. We need to set the media-class
* property.
*
* Pass your events and a user_data pointer as the last arguments. This
* will inform you about the stream state. The most important event
* you need to listen to is the process event where you need to provide
* the data.
*/
data.stream = pw_stream_new_simple(
pw_thread_loop_get_loop(data.loop),
"video-src-alloc",
pw_properties_new(
PW_KEY_MEDIA_CLASS, "Video/Source",
NULL),
&stream_events,
&data);
/* make a timer to schedule our frames */
data.timer = pw_loop_add_timer(pw_thread_loop_get_loop(data.loop), on_timeout, &data);
/* build the extra parameter for the connection. Here we make an
* EnumFormat parameter which lists the possible formats we can provide.
* The server will select a format that matches and informs us about this
* in the stream param_changed event.
*/
params[0] = spa_pod_builder_add_object(&b,
SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
SPA_FORMAT_mediaType, SPA_POD_Id(SPA_MEDIA_TYPE_video),
SPA_FORMAT_mediaSubtype, SPA_POD_Id(SPA_MEDIA_SUBTYPE_raw),
SPA_FORMAT_VIDEO_format, SPA_POD_Id(SPA_VIDEO_FORMAT_RGB),
SPA_FORMAT_VIDEO_size, SPA_POD_CHOICE_RANGE_Rectangle(
&SPA_RECTANGLE(320, 240),
&SPA_RECTANGLE(1, 1),
&SPA_RECTANGLE(4096, 4096)),
SPA_FORMAT_VIDEO_framerate, SPA_POD_Fraction(&SPA_FRACTION(25, 1)));
/* now connect the stream, we need a direction (input/output),
* an optional target node to connect to, some flags and parameters.
*
* Here we pass PW_STREAM_FLAG_ALLOC_BUFFERS. We should in the
* add_buffer callback configure the buffer memory. This should be
* fd backed memory (memfd, dma-buf, ...) that can be shared with
* the server. */
pw_stream_connect(data.stream,
PW_DIRECTION_OUTPUT,
PW_ID_ANY,
PW_STREAM_FLAG_DRIVER |
PW_STREAM_FLAG_ALLOC_BUFFERS,
params, 1);
/* unlock, run the loop and wait, this will trigger the callbacks */
pw_thread_loop_wait(data.loop);
/* unlock before stop */
pw_thread_loop_unlock(data.loop);
pw_thread_loop_stop(data.loop);
pw_stream_destroy(data.stream);
/* destroy after dependent objects are destroyed */
pw_thread_loop_destroy(data.loop);
pw_deinit();
return 0;
}
PW_ID_ANY
#define PW_ID_ANY
Definition core.h:66
PW_KEY_MEDIA_CLASS
#define PW_KEY_MEDIA_CLASS
class Ex: "Video/Source"
Definition keys.h:508
pw_log_trace
#define pw_log_trace(...)
Definition log.h:182
pw_log_warn
#define pw_log_warn(...)
Definition log.h:179
pw_log_error
#define pw_log_error(...)
Definition log.h:178
pw_log_info
#define pw_log_info(...)
Definition log.h:180
pw_loop_update_timer
#define pw_loop_update_timer(l,...)
Definition loop.h:67
pw_loop_add_timer
#define pw_loop_add_timer(l,...)
Definition loop.h:66
pw_loop_add_signal
#define pw_loop_add_signal(l,...)
Definition loop.h:68
pw_init
void pw_init(int *argc, char **argv[])
Initialize PipeWire.
Definition pipewire.c:488
pw_deinit
void pw_deinit(void)
Deinitialize PipeWire.
Definition pipewire.c:600
PW_DIRECTION_OUTPUT
#define PW_DIRECTION_OUTPUT
Definition port.h:50
pw_properties_new
struct pw_properties * pw_properties_new(const char *key,...)
Make a new properties object.
Definition properties.c:96
pw_stream_connect
int pw_stream_connect(struct pw_stream *stream, enum pw_direction direction, uint32_t target_id, enum pw_stream_flags flags, const struct spa_pod **params, uint32_t n_params)
Connect a stream for input or output on port_path.
Definition stream.c:1860
pw_stream_dequeue_buffer
struct pw_buffer * pw_stream_dequeue_buffer(struct pw_stream *stream)
Get a buffer that can be filled for playback streams or consumed for capture streams.
Definition stream.c:2415
pw_stream_get_node_id
uint32_t pw_stream_get_node_id(struct pw_stream *stream)
Get the node ID of the stream.
Definition stream.c:2150
pw_stream_get_nsec
uint64_t pw_stream_get_nsec(struct pw_stream *stream)
Get the current time in nanoseconds.
Definition stream.c:2391
pw_stream_is_driving
bool pw_stream_is_driving(struct pw_stream *stream)
Check if the stream is driving.
Definition stream.c:2524
pw_stream_state_as_string
const char * pw_stream_state_as_string(enum pw_stream_state state)
Convert a stream state to a readable string.
Definition stream.c:1603
pw_stream_state
pw_stream_state
The state of a stream.
Definition stream.h:202
pw_stream_update_params
int pw_stream_update_params(struct pw_stream *stream, const struct spa_pod **params, uint32_t n_params)
Update the param exposed on the stream.
Definition stream.c:2190
pw_stream_trigger_process
int pw_stream_trigger_process(struct pw_stream *stream)
Trigger a push/pull on the stream.
Definition stream.c:2565
pw_stream_queue_buffer
int pw_stream_queue_buffer(struct pw_stream *stream, struct pw_buffer *buffer)
Submit a buffer for playback or recycle a buffer for capture.
Definition stream.c:2443
pw_stream_new_simple
struct pw_stream * pw_stream_new_simple(struct pw_loop *loop, const char *name, struct pw_properties *props, const struct pw_stream_events *events, void *data)
Definition stream.c:1559
PW_VERSION_STREAM_EVENTS
#define PW_VERSION_STREAM_EVENTS
Definition stream.h:361
pw_stream_destroy
void pw_stream_destroy(struct pw_stream *stream)
Destroy a stream.
Definition stream.c:1653
PW_STREAM_FLAG_DRIVER
@ PW_STREAM_FLAG_DRIVER
be a driver
Definition stream.h:414
PW_STREAM_FLAG_ALLOC_BUFFERS
@ PW_STREAM_FLAG_ALLOC_BUFFERS
the application will allocate buffer memory.
Definition stream.h:423
PW_STREAM_STATE_PAUSED
@ PW_STREAM_STATE_PAUSED
paused
Definition stream.h:206
PW_STREAM_STATE_STREAMING
@ PW_STREAM_STATE_STREAMING
streaming
Definition stream.h:207
pw_thread_loop_unlock
void pw_thread_loop_unlock(struct pw_thread_loop *loop)
Unlock the loop.
Definition thread-loop.c:381
pw_thread_loop_start
int pw_thread_loop_start(struct pw_thread_loop *loop)
Start the thread loop.
Definition thread-loop.c:316
pw_thread_loop_get_loop
struct pw_loop * pw_thread_loop_get_loop(struct pw_thread_loop *loop)
Get the loop implementation of the thread loop.
Definition thread-loop.c:277
pw_thread_loop_destroy
void pw_thread_loop_destroy(struct pw_thread_loop *loop)
Destroy a thread loop.
Definition thread-loop.c:243
pw_thread_loop_stop
void pw_thread_loop_stop(struct pw_thread_loop *loop)
Stop the thread loop.
Definition thread-loop.c:349
pw_thread_loop_lock
void pw_thread_loop_lock(struct pw_thread_loop *loop)
Lock the loop.
Definition thread-loop.c:369
pw_thread_loop_new
struct pw_thread_loop * pw_thread_loop_new(const char *name, const struct spa_dict *props)
Make a new thread loop with the given name and optional properties.
Definition thread-loop.c:214
pw_thread_loop_wait
void pw_thread_loop_wait(struct pw_thread_loop *loop)
Release the lock and wait until some thread calls pw_thread_loop_signal.
Definition thread-loop.c:421
pw_thread_loop_signal
void pw_thread_loop_signal(struct pw_thread_loop *loop, bool wait_for_accept)
Signal all threads waiting with pw_thread_loop_wait.
Definition thread-loop.c:397
SPA_DATA_FLAG_MAPPABLE
#define SPA_DATA_FLAG_MAPPABLE
data is mappable with simple mmap/munmap.
Definition buffer.h:88
SPA_DATA_FLAG_READWRITE
#define SPA_DATA_FLAG_READWRITE
Definition buffer.h:86
spa_meta_first
#define spa_meta_first
Definition meta.h:57
spa_buffer_find_meta_data
static void * spa_buffer_find_meta_data(const struct spa_buffer *b, uint32_t type, size_t size)
Definition buffer.h:119
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:108
spa_meta_check
#define spa_meta_check(p, m)
Definition meta.h:62
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_Cursor
@ SPA_META_Cursor
struct spa_meta_cursor
Definition meta.h:31
SPA_META_VideoCrop
@ SPA_META_VideoCrop
struct spa_meta_region with cropping data
Definition meta.h:28
SPA_META_Header
@ SPA_META_Header
struct spa_meta_header
Definition meta.h:27
SPA_DATA_MemFd
@ SPA_DATA_MemFd
memfd, mmap to get to memory.
Definition buffer.h:35
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_META_size
@ SPA_PARAM_META_size
the expected maximum size the meta (Int)
Definition buffers.h:40
SPA_PARAM_META_type
@ SPA_PARAM_META_type
the metadata, one of enum spa_meta_type (Id enum spa_meta_type)
Definition buffers.h:39
SPA_MEDIA_TYPE_video
@ SPA_MEDIA_TYPE_video
Definition format.h:28
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_FORMAT_VIDEO_framerate
@ SPA_FORMAT_VIDEO_framerate
frame rate (Fraction)
Definition format.h:124
SPA_FORMAT_mediaType
@ SPA_FORMAT_mediaType
media type (Id enum spa_media_type)
Definition format.h:93
SPA_FORMAT_VIDEO_size
@ SPA_FORMAT_VIDEO_size
size (Rectangle)
Definition format.h:123
SPA_FORMAT_VIDEO_format
@ SPA_FORMAT_VIDEO_format
video format (Id enum spa_video_format)
Definition format.h:120
SPA_FORMAT_mediaSubtype
@ SPA_FORMAT_mediaSubtype
media subtype (Id enum spa_media_subtype)
Definition format.h:94
SPA_MEDIA_SUBTYPE_raw
@ SPA_MEDIA_SUBTYPE_raw
Definition format.h:38
SPA_VIDEO_FORMAT_ARGB
@ SPA_VIDEO_FORMAT_ARGB
Definition raw.h:58
SPA_VIDEO_FORMAT_RGB
@ SPA_VIDEO_FORMAT_RGB
Definition raw.h:60
SPA_PARAM_BUFFERS_dataType
@ SPA_PARAM_BUFFERS_dataType
possible memory types (flags choice Int, mask of enum spa_data_type)
Definition buffers.h:32
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_Fraction
#define SPA_POD_Fraction(val)
Definition vararg.h:111
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_INIT
#define SPA_POD_BUILDER_INIT(buffer, size)
Definition builder.h:62
SPA_POD_CHOICE_RANGE_Rectangle
#define SPA_POD_CHOICE_RANGE_Rectangle(def, min, max)
Definition vararg.h:106
spa_pod_builder_add_object
#define spa_pod_builder_add_object(b, type, id,...)
Definition builder.h:659
SPA_POD_Int
#define SPA_POD_Int(val)
Definition vararg.h:54
SPA_POD_CHOICE_FLAGS_Int
#define SPA_POD_CHOICE_FLAGS_Int(flags)
Definition vararg.h:62
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_TYPE_OBJECT_Format
@ SPA_TYPE_OBJECT_Format
Definition type.h:76
SPA_ROUND_UP_N
#define SPA_ROUND_UP_N(num, align)
Definition defs.h:342
SPA_FRACTION
#define SPA_FRACTION(num, denom)
Definition defs.h:136
SPA_NSEC_PER_MSEC
#define SPA_NSEC_PER_MSEC
Definition defs.h:255
SPA_REGION
#define SPA_REGION(x, y, width, height)
Definition defs.h:129
SPA_PTROFF
#define SPA_PTROFF(ptr_, offset_, type_)
Return the address (buffer + offset) as pointer of type.
Definition defs.h:222
SPA_POINT
#define SPA_POINT(x, y)
Definition defs.h:122
SPA_RECTANGLE
#define SPA_RECTANGLE(width, height)
Definition defs.h:115
pipewire.h
pipewire/pipewire.h
pw_buffer
a buffer structure obtained from pw_stream_dequeue_buffer().
Definition stream.h:212
pw_buffer::buffer
struct spa_buffer * buffer
the spa buffer
Definition stream.h:213
pw_stream_events
Events for a stream.
Definition stream.h:359
pw_stream
pw_thread_loop
spa_buffer
A Buffer.
Definition buffer.h:100
spa_buffer::datas
struct spa_data * datas
array of data members
Definition buffer.h:104
spa_chunk::stride
int32_t stride
stride of valid data
Definition buffer.h:55
spa_chunk::size
uint32_t size
size of valid data.
Definition buffer.h:53
spa_chunk::offset
uint32_t offset
offset of valid data.
Definition buffer.h:50
spa_data
Data for a buffer this stays constant for a buffer.
Definition buffer.h:68
spa_data::chunk
struct spa_chunk * chunk
valid chunk of memory
Definition buffer.h:96
spa_data::fd
int64_t fd
optional fd for data
Definition buffer.h:92
spa_data::mapoffset
uint32_t mapoffset
offset to map fd at, this is page aligned
Definition buffer.h:93
spa_data::flags
uint32_t flags
data flags
Definition buffer.h:91
spa_data::data
void * data
optional data pointer
Definition buffer.h:95
spa_data::maxsize
uint32_t maxsize
max size of data
Definition buffer.h:94
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:69
spa_hook
A hook, contains the structure with functions and the data passed to the functions.
Definition hook.h:350
spa_meta_bitmap
Bitmap information.
Definition meta.h:114
spa_meta_bitmap::size
struct spa_rectangle size
width and height of bitmap
Definition meta.h:118
spa_meta_bitmap::format
uint32_t format
bitmap video format, one of enum spa_video_format.
Definition meta.h:115
spa_meta_bitmap::offset
uint32_t offset
offset of bitmap data in this structure.
Definition meta.h:120
spa_meta_bitmap::stride
int32_t stride
stride of bitmap data
Definition meta.h:119
spa_meta_cursor
Cursor information.
Definition meta.h:133
spa_meta_cursor::hotspot
struct spa_point hotspot
offsets for hotspot in bitmap, this field has no meaning when there is no valid bitmap (see below)
Definition meta.h:138
spa_meta_cursor::id
uint32_t id
cursor id.
Definition meta.h:134
spa_meta_cursor::position
struct spa_point position
position on screen
Definition meta.h:137
spa_meta_cursor::bitmap_offset
uint32_t bitmap_offset
offset of bitmap meta in this structure.
Definition meta.h:140
spa_meta_header
Describes essential buffer header metadata such as flags and timestamps.
Definition meta.h:68
spa_meta_header::flags
uint32_t flags
flags
Definition meta.h:81
spa_meta_header::seq
uint64_t seq
sequence number, increments with a media specific frequency
Definition meta.h:85
spa_meta_header::pts
int64_t pts
presentation timestamp in nanoseconds
Definition meta.h:83
spa_meta_header::dts_offset
int64_t dts_offset
decoding timestamp as a difference with pts
Definition meta.h:84
spa_meta_region
metadata structure for Region or an array of these for RegionArray
Definition meta.h:90
spa_meta_region::region
struct spa_region region
Definition meta.h:91
spa_meta
A metadata element.
Definition meta.h:48
spa_pod_builder
Definition builder.h:53
spa_pod
Definition pod.h:43
spa_point::y
int32_t y
Definition defs.h:125
spa_point::x
int32_t x
Definition defs.h:124
spa_rectangle::width
uint32_t width
Definition defs.h:117
spa_rectangle::height
uint32_t height
Definition defs.h:118
spa_region::position
struct spa_point position
Definition defs.h:131
spa_region::size
struct spa_rectangle size
Definition defs.h:132
spa_source
Definition loop.h:55
spa_video_info_raw
Definition raw.h:176