PipeWire 1.2.6

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video-play-fixate.c

Video input stream using pw_stream, with format fixation.

Video input stream using pw_stream, with format fixation.

/* PipeWire */
/* SPDX-FileCopyrightText: Copyright © 2020 Wim Taymans */
/* SPDX-License-Identifier: MIT */
/*
[title]
Video input stream using \ref pw_stream "pw_stream", with format fixation.
[title]
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <libdrm/drm_fourcc.h>
#include <spa/utils/result.h>
#include <spa/param/video/format-utils.h>
#include <spa/param/props.h>
#include <spa/debug/format.h>
#include <pipewire/pipewire.h>
#define WIDTH 640
#define HEIGHT 480
#define MAX_BUFFERS 64
#define MAX_MOD 8
#include "sdl.h"
struct pixel {
float r, g, b, a;
};
struct pw_version {
int major;
int minor;
int micro;
};
struct modifier_info {
uint32_t spa_format;
uint32_t n_modifiers;
uint64_t modifiers[MAX_MOD];
};
struct data {
const char *path;
SDL_Renderer *renderer;
SDL_Window *window;
SDL_Texture *texture;
SDL_Texture *cursor;
struct pw_main_loop *loop;
struct spa_source *reneg;
struct pw_stream *stream;
struct spa_hook stream_listener;
struct spa_video_info format;
int32_t stride;
struct spa_rectangle size;
uint32_t n_mod_info;
struct modifier_info mod_info[2];
int counter;
};
static struct pw_version parse_pw_version(const char* version) {
struct pw_version pw_version;
sscanf(version, "%d.%d.%d", &pw_version.major, &pw_version.minor,
&pw_version.micro);
return pw_version;
}
static bool has_pw_version(int major, int minor, int micro) {
struct pw_version pw_version = parse_pw_version(pw_get_library_version());
printf("PW Version: %d.%d.%d\n", pw_version.major, pw_version.minor,
pw_version.micro);
return major <= pw_version.major && minor <= pw_version.minor && micro <= pw_version.micro;
}
static void init_modifiers(struct data *data)
{
data->n_mod_info = 1;
data->mod_info[0].spa_format = SPA_VIDEO_FORMAT_RGB;
data->mod_info[0].n_modifiers = 2;
data->mod_info[0].modifiers[0] = DRM_FORMAT_MOD_LINEAR;
data->mod_info[0].modifiers[1] = DRM_FORMAT_MOD_INVALID;
}
static void destroy_modifiers(struct data *data)
{
data->mod_info[0].n_modifiers = 0;
}
static void strip_modifier(struct data *data, uint32_t spa_format, uint64_t modifier)
{
if (data->mod_info[0].spa_format != spa_format)
return;
struct modifier_info *mod_info = &data->mod_info[0];
uint32_t counter = 0;
// Dropping of single modifiers is only supported on PipeWire 0.3.40 and newer.
// On older PipeWire just dropping all modifiers might work on Versions newer then 0.3.33/35
if (has_pw_version(0,3,40)) {
printf("Dropping a single modifier\n");
for (uint32_t i = 0; i < mod_info->n_modifiers; i++) {
if (mod_info->modifiers[i] == modifier)
continue;
mod_info->modifiers[counter++] = mod_info->modifiers[i];
}
} else {
printf("Dropping all modifiers\n");
counter = 0;
}
mod_info->n_modifiers = counter;
}
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 struct spa_pod *build_format(struct spa_pod_builder *b, SDL_RendererInfo *info, enum spa_video_format format,
uint64_t *modifiers, int modifier_count)
{
struct spa_pod_frame f[2];
int i, c;
spa_pod_builder_push_object(b, &f[0], SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat);
spa_pod_builder_add(b, SPA_FORMAT_mediaType, SPA_POD_Id(SPA_MEDIA_TYPE_video), 0);
spa_pod_builder_add(b, SPA_FORMAT_mediaSubtype, SPA_POD_Id(SPA_MEDIA_SUBTYPE_raw), 0);
/* format */
spa_pod_builder_add(b, SPA_FORMAT_VIDEO_format, SPA_POD_Id(format), 0);
/* modifiers */
if (modifier_count == 1 && modifiers[0] == DRM_FORMAT_MOD_INVALID) {
// we only support implicit modifiers, use shortpath to skip fixation phase
spa_pod_builder_prop(b, SPA_FORMAT_VIDEO_modifier, SPA_POD_PROP_FLAG_MANDATORY);
spa_pod_builder_long(b, modifiers[0]);
} else if (modifier_count > 0) {
// build an enumeration of modifiers
spa_pod_builder_prop(b, SPA_FORMAT_VIDEO_modifier, SPA_POD_PROP_FLAG_MANDATORY | SPA_POD_PROP_FLAG_DONT_FIXATE);
spa_pod_builder_push_choice(b, &f[1], SPA_CHOICE_Enum, 0);
// modifiers from the array
for (i = 0, c = 0; i < modifier_count; i++) {
spa_pod_builder_long(b, modifiers[i]);
if (c++ == 0)
spa_pod_builder_long(b, modifiers[i]);
}
spa_pod_builder_pop(b, &f[1]);
}
spa_pod_builder_add(b, SPA_FORMAT_VIDEO_size,
SPA_POD_CHOICE_RANGE_Rectangle(
&SPA_RECTANGLE(WIDTH, HEIGHT),
&SPA_RECTANGLE(1,1),
&SPA_RECTANGLE(info->max_texture_width,
info->max_texture_height)),
0);
spa_pod_builder_add(b, SPA_FORMAT_VIDEO_framerate,
SPA_POD_CHOICE_RANGE_Fraction(
&SPA_FRACTION(25,1),
&SPA_FRACTION(0,1),
&SPA_FRACTION(30,1)),
0);
return spa_pod_builder_pop(b, &f[0]);
}
/* our data processing function is in general:
*
* struct pw_buffer *b;
* b = pw_stream_dequeue_buffer(stream);
*
* .. do stuff with buffer ...
*
* pw_stream_queue_buffer(stream, b);
*/
static void
on_process(void *_data)
{
struct data *data = _data;
struct pw_stream *stream = data->stream;
struct pw_buffer *b;
struct spa_buffer *buf;
void *sdata, *ddata;
int sstride, dstride, ostride;
uint32_t i;
uint8_t *src, *dst;
b = NULL;
/* dequeue and queue old buffers, use the last available
* buffer */
while (true) {
struct pw_buffer *t;
if ((t = pw_stream_dequeue_buffer(stream)) == NULL)
break;
if (b)
pw_stream_queue_buffer(stream, b);
b = t;
}
if (b == NULL) {
pw_log_warn("out of buffers: %m");
return;
}
buf = b->buffer;
pw_log_info("new buffer %p", buf);
handle_events(data);
if (buf->datas[0].type == SPA_DATA_DmaBuf) {
// Simulate a failed import of a DmaBuf
// We should try another modifier
printf("Failed to import dmabuf, stripping modifier %"PRIu64"\n", data->format.info.raw.modifier);
strip_modifier(data, data->format.info.raw.format, data->format.info.raw.modifier);
pw_loop_signal_event(pw_main_loop_get_loop(data->loop), data->reneg);
goto done;
}
if ((sdata = buf->datas[0].data) == NULL)
goto done;
if (SDL_LockTexture(data->texture, NULL, &ddata, &dstride) < 0) {
fprintf(stderr, "Couldn't lock texture: %s\n", SDL_GetError());
goto done;
}
/* copy video image in texture */
sstride = buf->datas[0].chunk->stride;
if (sstride == 0)
sstride = buf->datas[0].chunk->size / data->size.height;
ostride = SPA_MIN(sstride, dstride);
src = sdata;
dst = ddata;
for (i = 0; i < data->size.height; i++) {
memcpy(dst, src, ostride);
src += sstride;
dst += dstride;
}
SDL_UnlockTexture(data->texture);
SDL_RenderClear(data->renderer);
/* now render the video */
SDL_RenderCopy(data->renderer, data->texture, NULL, NULL);
SDL_RenderPresent(data->renderer);
done:
pw_stream_queue_buffer(stream, b);
}
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;
fprintf(stderr, "stream state: \"%s\"\n", pw_stream_state_as_string(state));
switch (state) {
case PW_STREAM_STATE_UNCONNECTED:
pw_main_loop_quit(data->loop);
break;
case PW_STREAM_STATE_PAUSED:
break;
case PW_STREAM_STATE_STREAMING:
default:
break;
}
}
/* Be notified when the stream param changes. We're only looking at the
* format changes.
*
* We are now supposed to call pw_stream_finish_format() 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_finish_format() 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[1];
Uint32 sdl_format;
void *d;
/* NULL means to clear the format */
if (param == NULL || id != SPA_PARAM_Format)
return;
fprintf(stderr, "got format:\n");
spa_debug_format(2, NULL, param);
if (spa_format_parse(param, &data->format.media_type, &data->format.media_subtype) < 0)
return;
if (data->format.media_type != SPA_MEDIA_TYPE_video ||
data->format.media_subtype != SPA_MEDIA_SUBTYPE_raw)
return;
/* call a helper function to parse the format for us. */
spa_format_video_raw_parse(param, &data->format.info.raw);
sdl_format = id_to_sdl_format(data->format.info.raw.format);
data->size = data->format.info.raw.size;
if (sdl_format == SDL_PIXELFORMAT_UNKNOWN) {
pw_stream_set_error(stream, -EINVAL, "unknown pixel format");
return;
}
if (data->size.width == 0 || data->size.height == 0) {
pw_stream_set_error(stream, -EINVAL, "invalid size");
return;
}
data->texture = SDL_CreateTexture(data->renderer,
sdl_format,
SDL_TEXTUREACCESS_STREAMING,
data->size.width,
data->size.height);
SDL_LockTexture(data->texture, NULL, &d, &data->stride);
SDL_UnlockTexture(data->texture);
/* a SPA_TYPE_OBJECT_ParamBuffers object defines the acceptable size,
* number, stride etc of the buffers */
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->size.height),
SPA_PARAM_BUFFERS_stride, SPA_POD_Int(data->stride),
SPA_PARAM_BUFFERS_dataType, SPA_POD_CHOICE_FLAGS_Int((1<<SPA_DATA_MemPtr) | (1<<SPA_DATA_DmaBuf)));
/* we are done */
pw_stream_update_params(stream, params, 1);
}
/* these are the stream events we listen for */
static const struct pw_stream_events stream_events = {
PW_VERSION_STREAM_EVENTS,
.state_changed = on_stream_state_changed,
.param_changed = on_stream_param_changed,
.process = on_process,
};
static int build_formats(struct data *data, struct spa_pod_builder *b, const struct spa_pod **params)
{
SDL_RendererInfo info;
int n_params = 0;
SDL_GetRendererInfo(data->renderer, &info);
if (data->mod_info[0].n_modifiers > 0) {
params[n_params++] = build_format(b, &info, SPA_VIDEO_FORMAT_RGB, data->mod_info[0].modifiers, data->mod_info[0].n_modifiers);
}
params[n_params++] = build_format(b, &info, SPA_VIDEO_FORMAT_RGB, NULL, 0);
for (int i=0; i < n_params; i++) {
spa_debug_format(2, NULL, params[i]);
}
return n_params;
}
static void reneg_format(void *_data, uint64_t expiration)
{
struct data *data = (struct data*) _data;
uint8_t buffer[1024];
struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
const struct spa_pod *params[2];
uint32_t n_params;
if (data->format.info.raw.format == 0)
return;
fprintf(stderr, "renegotiate formats:\n");
n_params = build_formats(data, &b, params);
pw_stream_update_params(data->stream, params, n_params);
}
static void do_quit(void *userdata, int signal_number)
{
struct data *data = userdata;
pw_main_loop_quit(data->loop);
}
int main(int argc, char *argv[])
{
struct data data = { 0, };
const struct spa_pod *params[2];
uint8_t buffer[1024];
struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
struct pw_properties *props;
int res, n_params;
pw_init(&argc, &argv);
/* create a main loop */
data.loop = pw_main_loop_new(NULL);
pw_loop_add_signal(pw_main_loop_get_loop(data.loop), SIGINT, do_quit, &data);
pw_loop_add_signal(pw_main_loop_get_loop(data.loop), SIGTERM, do_quit, &data);
/* create a simple stream, the simple stream manages to core and remote
* objects for you if you don't need to deal with them
*
* If you plan to autoconnect your stream, you need to provide at least
* media, category and role properties
*
* 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 consume
* the data provided to you.
*/
props = pw_properties_new(PW_KEY_MEDIA_TYPE, "Video",
PW_KEY_MEDIA_CATEGORY, "Capture",
PW_KEY_MEDIA_ROLE, "Camera",
NULL),
data.path = argc > 1 ? argv[1] : NULL;
if (data.path)
/* Set stream target if given on command line */
pw_properties_set(props, PW_KEY_TARGET_OBJECT, data.path);
data.stream = pw_stream_new_simple(
pw_main_loop_get_loop(data.loop),
"video-play-fixate",
props,
&stream_events,
&data);
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
fprintf(stderr, "can't initialize SDL: %s\n", SDL_GetError());
return -1;
}
init_modifiers(&data);
if (SDL_CreateWindowAndRenderer
(WIDTH, HEIGHT, SDL_WINDOW_RESIZABLE, &data.window, &data.renderer)) {
fprintf(stderr, "can't create window: %s\n", SDL_GetError());
return -1;
}
/* build the extra parameters to connect with. To connect, we can provide
* a list of supported formats. We use a builder that writes the param
* object to the stack. */
printf("supported formats:\n");
n_params = build_formats(&data, &b, params);
/* now connect the stream, we need a direction (input/output),
* an optional target node to connect to, some flags and parameters
*/
if ((res = pw_stream_connect(data.stream,
PW_DIRECTION_INPUT,
PW_ID_ANY,
PW_STREAM_FLAG_AUTOCONNECT | /* try to automatically connect this stream */
PW_STREAM_FLAG_MAP_BUFFERS, /* mmap the buffer data for us */
params, n_params)) /* extra parameters, see above */ < 0) {
fprintf(stderr, "can't connect: %s\n", spa_strerror(res));
return -1;
}
data.reneg = pw_loop_add_event(pw_main_loop_get_loop(data.loop), reneg_format, &data);
/* do things until we quit the mainloop */
pw_main_loop_run(data.loop);
pw_stream_destroy(data.stream);
pw_main_loop_destroy(data.loop);
destroy_modifiers(&data);
SDL_DestroyTexture(data.texture);
if (data.cursor)
SDL_DestroyTexture(data.cursor);
SDL_DestroyRenderer(data.renderer);
SDL_DestroyWindow(data.window);
pw_deinit();
return 0;
}
format.h
spa/debug/format.h
PW_ID_ANY
#define PW_ID_ANY
Definition core.h:66
PW_KEY_MEDIA_TYPE
#define PW_KEY_MEDIA_TYPE
Media.
Definition keys.h:486
PW_KEY_TARGET_OBJECT
#define PW_KEY_TARGET_OBJECT
a target object to link to.
Definition keys.h:553
PW_KEY_MEDIA_ROLE
#define PW_KEY_MEDIA_ROLE
Role: Movie, Music, Camera, Screen, Communication, Game, Notification, DSP, Production,...
Definition keys.h:492
PW_KEY_MEDIA_CATEGORY
#define PW_KEY_MEDIA_CATEGORY
Media Category: Playback, Capture, Duplex, Monitor, Manager.
Definition keys.h:489
pw_log_warn
#define pw_log_warn(...)
Definition log.h:179
pw_log_info
#define pw_log_info(...)
Definition log.h:180
pw_loop_add_signal
#define pw_loop_add_signal(l,...)
Definition loop.h:68
pw_loop_signal_event
#define pw_loop_signal_event(l,...)
Definition loop.h:65
pw_loop_add_event
#define pw_loop_add_event(l,...)
Definition loop.h:64
pw_main_loop_quit
int pw_main_loop_quit(struct pw_main_loop *loop)
Quit a main loop.
Definition main-loop.c:108
pw_main_loop_destroy
void pw_main_loop_destroy(struct pw_main_loop *loop)
Destroy a loop.
Definition main-loop.c:73
pw_main_loop_run
int pw_main_loop_run(struct pw_main_loop *loop)
Run a main loop.
Definition main-loop.c:122
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:63
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:96
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_INPUT
#define PW_DIRECTION_INPUT
Definition port.h:48
pw_properties_new
struct pw_properties * pw_properties_new(const char *key,...)
Make a new properties object.
Definition properties.c:96
pw_properties_set
int pw_properties_set(struct pw_properties *properties, const char *key, const char *value)
Set a property value.
Definition properties.c:589
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:1858
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:2413
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:1601
pw_stream_state
pw_stream_state
The state of a stream.
Definition stream.h:202
pw_stream_set_error
int pw_stream_set_error(struct pw_stream *stream, int res, const char *error,...)
Set the stream in error state.
Definition stream.c:2162
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:2188
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:2441
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:1557
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:1651
PW_STREAM_FLAG_MAP_BUFFERS
@ PW_STREAM_FLAG_MAP_BUFFERS
mmap the buffers except DmaBuf that is not explicitly marked as mappable.
Definition stream.h:412
PW_STREAM_FLAG_AUTOCONNECT
@ PW_STREAM_FLAG_AUTOCONNECT
try to automatically connect this stream
Definition stream.h:407
PW_STREAM_STATE_PAUSED
@ PW_STREAM_STATE_PAUSED
paused
Definition stream.h:206
PW_STREAM_STATE_UNCONNECTED
@ PW_STREAM_STATE_UNCONNECTED
unconnected
Definition stream.h:204
PW_STREAM_STATE_STREAMING
@ PW_STREAM_STATE_STREAMING
streaming
Definition stream.h:207
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_format_parse
static int spa_format_parse(const struct spa_pod *format, uint32_t *media_type, uint32_t *media_subtype)
Definition format-utils.h:27
spa_format
spa_format
properties for audio SPA_TYPE_OBJECT_Format
Definition format.h:90
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_video_format
spa_video_format
Video formats.
Definition raw.h:43
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_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_modifier
@ SPA_FORMAT_VIDEO_modifier
format modifier (Long) use only with DMA-BUF and omit for other buffer types
Definition format.h:121
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_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_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_CHOICE_RANGE_Fraction
#define SPA_POD_CHOICE_RANGE_Fraction(def, min, max)
Definition vararg.h:115
SPA_POD_PROP_FLAG_MANDATORY
#define SPA_POD_PROP_FLAG_MANDATORY
is mandatory
Definition pod.h:222
spa_pod_builder_add
static int spa_pod_builder_add(struct spa_pod_builder *builder,...)
Definition builder.h:647
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_builder_pop
static void * spa_pod_builder_pop(struct spa_pod_builder *builder, struct spa_pod_frame *frame)
Definition builder.h:168
SPA_POD_CHOICE_RANGE_Rectangle
#define SPA_POD_CHOICE_RANGE_Rectangle(def, min, max)
Definition vararg.h:106
SPA_POD_PROP_FLAG_DONT_FIXATE
#define SPA_POD_PROP_FLAG_DONT_FIXATE
choices need no fixation
Definition pod.h:224
spa_pod_builder_add_object
#define spa_pod_builder_add_object(b, type, id,...)
Definition builder.h:659
spa_pod_builder_push_choice
static int spa_pod_builder_push_choice(struct spa_pod_builder *builder, struct spa_pod_frame *frame, uint32_t type, uint32_t flags)
Definition builder.h:406
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_builder_long
static int spa_pod_builder_long(struct spa_pod_builder *builder, int64_t val)
Definition builder.h:256
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_CHOICE_Enum
@ SPA_CHOICE_Enum
list: default, alternative,...
Definition pod.h:150
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_Format
@ SPA_TYPE_OBJECT_Format
Definition type.h:76
SPA_MIN
#define SPA_MIN(a, b)
Definition defs.h:165
SPA_FRACTION
#define SPA_FRACTION(num, denom)
Definition defs.h:136
SPA_RECTANGLE
#define SPA_RECTANGLE(width, height)
Definition defs.h:115
pipewire.h
pipewire/pipewire.h
props.h
result.h
spa/utils/result.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_main_loop
A main loop object.
pw_properties
Definition properties.h:34
pw_stream_events
Events for a stream.
Definition stream.h:359
pw_stream
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_data::chunk
struct spa_chunk * chunk
valid chunk of memory
Definition buffer.h:96
spa_data::data
void * data
optional data pointer
Definition buffer.h:95
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_pod_builder
Definition builder.h:53
spa_pod_frame
Definition iter.h:27
spa_pod
Definition pod.h:43
spa_rectangle
Definition defs.h:116
spa_source
Definition loop.h:55
spa_video_info
Definition format.h:27