PipeWire 1.0.3
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video-dsp-play.c

Video input stream using pw_filter.

/* PipeWire */
/* SPDX-FileCopyrightText: Copyright © 2019 Wim Taymans */
/* SPDX-License-Identifier: MIT */
/*
[title]
Video input stream using \ref pw_filter "pw_filter".
[title]
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/mman.h>
#include <spa/param/video/format-utils.h>
#define WIDTH 640
#define HEIGHT 480
#define BPP 3
#define MAX_BUFFERS 64
#include "sdl.h"
struct pixel {
float r, g, b, a;
};
struct data {
const char *target;
SDL_Renderer *renderer;
SDL_Window *window;
SDL_Texture *texture;
SDL_Texture *cursor;
struct pw_main_loop *loop;
struct pw_filter *filter;
struct spa_hook filter_listener;
void *in_port;
struct spa_io_position *position;
struct spa_video_info_dsp format;
int counter;
SDL_Rect rect;
SDL_Rect cursor_rect;
};
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;
}
}
}
/* our data processing function is in general:
*
* struct pw_buffer *b;
* b = pw_filter_dequeue_buffer(port);
*
* .. do stuff with buffer ...
*
* pw_filter_queue_buffer(port, b);
*/
static void
on_process(void *_data, struct spa_io_position *position)
{
struct data *data = _data;
struct pw_buffer *b;
struct spa_buffer *buf;
void *sdata, *ddata;
int sstride, dstride;
uint32_t i, j;
uint8_t *src, *dst;
b = NULL;
while (true) {
struct pw_buffer *t;
if ((t = pw_filter_dequeue_buffer(data->in_port)) == NULL)
break;
if (b)
pw_filter_queue_buffer(data->in_port, b);
b = t;
}
if (b == NULL) {
pw_log_warn("out of buffers: %m");
return;
}
buf = b->buffer;
pw_log_trace("new buffer %p %dx%d", buf,
data->position->video.size.width, data->position->video.size.height);
handle_events(data);
if ((sdata = buf->datas[0].data) == NULL) {
pw_log_error("no buffer data");
goto done;
}
if (SDL_LockTexture(data->texture, NULL, &ddata, &dstride) < 0) {
pw_log_error("Couldn't lock texture: %s", 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->position->video.size.height;
src = sdata;
dst = ddata;
for (i = 0; i < data->position->video.size.height; i++) {
struct pixel *p = (struct pixel *) src;
for (j = 0; j < data->position->video.size.width; j++) {
dst[j * 4 + 0] = SPA_CLAMP(p[j].r * 255.0f, 0, 255);
dst[j * 4 + 1] = SPA_CLAMP(p[j].g * 255.0f, 0, 255);
dst[j * 4 + 2] = SPA_CLAMP(p[j].b * 255.0f, 0, 255);
dst[j * 4 + 3] = SPA_CLAMP(p[j].a * 255.0f, 0, 255);
}
src += sstride;
dst += dstride;
}
SDL_UnlockTexture(data->texture);
SDL_RenderClear(data->renderer);
SDL_RenderCopy(data->renderer, data->texture, &data->rect, NULL);
SDL_RenderPresent(data->renderer);
done:
pw_filter_queue_buffer(data->in_port, b);
}
static void on_filter_state_changed(void *_data, enum pw_filter_state old,
enum pw_filter_state state, const char *error)
{
struct data *data = _data;
fprintf(stderr, "filter state: \"%s\"\n", pw_filter_state_as_string(state));
switch (state) {
pw_main_loop_quit(data->loop);
break;
default:
break;
}
}
static void
on_filter_io_changed(void *_data, void *port_data, uint32_t id, void *area, uint32_t size)
{
struct data *data = _data;
switch (id) {
data->position = area;
break;
}
}
static void
on_filter_param_changed(void *_data, void *port_data, uint32_t id, const struct spa_pod *param)
{
struct data *data = _data;
struct pw_filter *filter = data->filter;
/* NULL means to clear the format */
if (param == NULL || id != SPA_PARAM_Format)
return;
/* call a helper function to parse the format for us. */
spa_format_video_dsp_parse(param, &data->format);
if (data->format.format != SPA_VIDEO_FORMAT_RGBA_F32) {
pw_filter_set_error(filter, -EINVAL, "unknown format");
return;
}
data->texture = SDL_CreateTexture(data->renderer,
SDL_PIXELFORMAT_RGBA32,
SDL_TEXTUREACCESS_STREAMING,
data->position->video.size.width,
data->position->video.size.height);
if (data->texture == NULL) {
pw_filter_set_error(filter, -errno, "can't create texture");
return;
}
data->rect.x = 0;
data->rect.y = 0;
data->rect.w = data->position->video.size.width;
data->rect.h = data->position->video.size.height;
}
/* these are the filter events we listen for */
static const struct pw_filter_events filter_events = {
.state_changed = on_filter_state_changed,
.io_changed = on_filter_io_changed,
.param_changed = on_filter_param_changed,
.process = on_process,
};
int main(int argc, char *argv[])
{
struct data data = { 0, };
pw_init(&argc, &argv);
/* create a main loop */
data.loop = pw_main_loop_new(NULL);
data.target = argc > 1 ? argv[1] : NULL;
/* create a simple filter, the simple filter manages to core and remote
* objects for you if you don't need to deal with them
*
* If you plan to autoconnect your filter, 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 filter state. The most important event
* you need to listen to is the process event where you need to consume
* the data provided to you.
*/
data.filter = pw_filter_new_simple(
"video-dsp-play",
PW_KEY_NODE_AUTOCONNECT, data.target ? "true" : "false",
PW_KEY_TARGET_OBJECT, data.target,
PW_KEY_MEDIA_CLASS, "Stream/Input/Video",
NULL),
&filter_events,
&data);
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
fprintf(stderr, "can't initialize SDL: %s\n", SDL_GetError());
return -1;
}
if (SDL_CreateWindowAndRenderer
(WIDTH, HEIGHT, SDL_WINDOW_RESIZABLE, &data.window, &data.renderer)) {
fprintf(stderr, "can't create window: %s\n", SDL_GetError());
return -1;
}
/* Make a new DSP port. This will automatically set up the right
* parameters for the port */
data.in_port = pw_filter_add_port(data.filter,
0,
PW_KEY_FORMAT_DSP, "32 bit float RGBA video",
PW_KEY_PORT_NAME, "input",
NULL),
NULL, 0);
pw_filter_connect(data.filter,
0, /* no flags */
NULL, 0);
/* do things until we quit the mainloop */
pw_main_loop_run(data.loop);
pw_filter_destroy(data.filter);
SDL_DestroyTexture(data.texture);
if (data.cursor)
SDL_DestroyTexture(data.cursor);
SDL_DestroyRenderer(data.renderer);
SDL_DestroyWindow(data.window);
return 0;
}
spa/debug/format.h
const char * pw_filter_state_as_string(enum pw_filter_state state)
Convert a filter state to a readable string
Definition filter.c:1367
int pw_filter_connect(struct pw_filter *filter, enum pw_filter_flags flags, const struct spa_pod **params, uint32_t n_params)
Connect a filter for processing.
Definition filter.c:1589
int pw_filter_queue_buffer(void *port_data, struct pw_buffer *buffer)
Submit a buffer for playback or recycle a buffer for capture.
Definition filter.c:2016
pw_filter_state
The state of a filter
Definition filter.h:42
void * pw_filter_add_port(struct pw_filter *filter, enum pw_direction direction, enum pw_filter_port_flags flags, size_t port_data_size, struct pw_properties *props, const struct spa_pod **params, uint32_t n_params)
add a port to the filter, returns user data of port_data_size.
Definition filter.c:1820
#define PW_VERSION_FILTER_EVENTS
Definition filter.h:66
struct pw_buffer * pw_filter_dequeue_buffer(void *port_data)
Get a buffer that can be filled for output ports or consumed for input ports.
Definition filter.c:1998
int pw_filter_set_error(struct pw_filter *filter, int res, const char *error,...)
Set the filter in error state.
Definition filter.c:1903
void pw_filter_destroy(struct pw_filter *filter)
Destroy a filter
Definition filter.c:1426
struct pw_filter * pw_filter_new_simple(struct pw_loop *loop, const char *name, struct pw_properties *props, const struct pw_filter_events *events, void *data)
Definition filter.c:1322
@ PW_FILTER_PORT_FLAG_MAP_BUFFERS
mmap the buffers except DmaBuf that is not explicitly marked as mappable.
Definition filter.h:129
@ PW_FILTER_STATE_UNCONNECTED
unconnected
Definition filter.h:44
#define PW_KEY_PORT_NAME
port name
Definition keys.h:282
#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:207
#define PW_KEY_TARGET_OBJECT
a target object to link to.
Definition keys.h:503
#define PW_KEY_MEDIA_ROLE
Role: Movie, Music, Camera, Screen, Communication, Game, Notification, DSP, Production,...
Definition keys.h:444
#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_KEY_MEDIA_CLASS
class Ex: "Video/Source"
Definition keys.h:449
#define pw_log_trace(...)
Definition log.h:135
#define pw_log_warn(...)
Definition log.h:132
#define pw_log_error(...)
Definition log.h:131
int pw_main_loop_quit(struct pw_main_loop *loop)
Quit a main loop.
Definition main-loop.c:106
void pw_main_loop_destroy(struct pw_main_loop *loop)
Destroy a loop.
Definition main-loop.c:71
int pw_main_loop_run(struct pw_main_loop *loop)
Run a main loop.
Definition main-loop.c:120
struct pw_main_loop * pw_main_loop_new(const struct spa_dict *props)
Create a new main loop.
Definition main-loop.c:61
struct pw_loop * pw_main_loop_get_loop(struct pw_main_loop *loop)
Get the loop implementation.
Definition main-loop.c:94
void pw_init(int *argc, char **argv[])
Initialize PipeWire.
Definition pipewire.c:556
#define PW_DIRECTION_INPUT
Definition port.h:48
struct pw_properties * pw_properties_new(const char *key,...)
Make a new properties object.
Definition properties.c:85
@ SPA_IO_Position
position information in the graph, struct spa_io_position
Definition io.h:44
static int spa_format_video_dsp_parse(const struct spa_pod *format, struct spa_video_info_dsp *info)
Definition dsp-utils.h:27
@ SPA_PARAM_Format
configured format as SPA_TYPE_OBJECT_Format
Definition param.h:34
@ SPA_VIDEO_FORMAT_RGBA_F32
Definition raw.h:125
#define SPA_CLAMP(v, low, high)
Definition defs.h:163
pipewire/pipewire.h
pipewire/filter.h
a buffer structure obtained from pw_stream_dequeue_buffer().
Definition stream.h:196
struct spa_buffer * buffer
the spa buffer
Definition stream.h:197
Events for a filter.
Definition filter.h:64
A main loop object.
A Buffer.
Definition buffer.h:94
struct spa_data * datas
array of data members
Definition buffer.h:98
int32_t stride
stride of valid data
Definition buffer.h:49
uint32_t size
size of valid data.
Definition buffer.h:47
struct spa_chunk * chunk
valid chunk of memory
Definition buffer.h:90
void * data
optional data pointer
Definition buffer.h:89
A hook, contains the structure with functions and the data passed to the functions.
Definition hook.h:350
The position information adds extra meaning to the raw clock times.
Definition io.h:279
Definition pod.h:43
Definition dsp.h:24