PipeWire: local-v4l2.c

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local-v4l2.c

Example using libspa-v4l2, with only SPA

Example using libspa-v4l2, with only SPA

/* Spa */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */
/*
[title]
Example using libspa-v4l2, with only \ref api_spa
[title]
*/
#include "config.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dlfcn.h>
#include <poll.h>
#include <pthread.h>
#include <errno.h>
#include <sys/mman.h>
#include <SDL2/SDL.h>
#include <spa/support/plugin.h>
#include <spa/utils/names.h>
#include <spa/utils/result.h>
#include <spa/utils/string.h>
#include <spa/support/log-impl.h>
#include <spa/support/loop.h>
#include <spa/node/node.h>
#include <spa/node/io.h>
#include <spa/node/utils.h>
#include <spa/param/param.h>
#include <spa/param/props.h>
#include <spa/param/video/format-utils.h>
#include <spa/debug/pod.h>
static SPA_LOG_IMPL(default_log);
#define MAX_BUFFERS 8
struct buffer {
struct spa_buffer buffer;
struct spa_meta metas[1];
struct spa_meta_header header;
struct spa_data datas[1];
struct spa_chunk chunks[1];
SDL_Texture *texture;
};
struct data {
const char *plugin_dir;
struct spa_log *log;
struct spa_system *system;
struct spa_loop *loop;
struct spa_loop_control *control;
struct spa_support support[5];
uint32_t n_support;
struct spa_node *source;
struct spa_hook listener;
struct spa_io_buffers source_output[1];
SDL_Renderer *renderer;
SDL_Window *window;
SDL_Texture *texture;
bool use_buffer;
bool running;
pthread_t thread;
struct spa_buffer *bp[MAX_BUFFERS];
struct buffer buffers[MAX_BUFFERS];
unsigned int n_buffers;
};
static int load_handle(struct data *data, struct spa_handle **handle, const char *lib, const char *name)
{
int res;
void *hnd;
spa_handle_factory_enum_func_t enum_func;
uint32_t i;
char *path = NULL;
if ((path = spa_aprintf("%s/%s", data->plugin_dir, lib)) == NULL) {
return -ENOMEM;
}
if ((hnd = dlopen(path, RTLD_NOW)) == NULL) {
printf("can't load %s: %s\n", path, dlerror());
free(path);
return -ENOENT;
}
free(path);
if ((enum_func = dlsym(hnd, SPA_HANDLE_FACTORY_ENUM_FUNC_NAME)) == NULL) {
printf("can't find enum function\n");
return -ENOENT;
}
for (i = 0;;) {
const struct spa_handle_factory *factory;
if ((res = enum_func(&factory, &i)) <= 0) {
if (res != 0)
printf("can't enumerate factories: %s\n", spa_strerror(res));
break;
}
if (factory->version < 1)
continue;
if (!spa_streq(factory->name, name))
continue;
*handle = calloc(1, spa_handle_factory_get_size(factory, NULL));
if ((res = spa_handle_factory_init(factory, *handle,
NULL, data->support,
data->n_support)) < 0) {
printf("can't make factory instance: %d\n", res);
return res;
}
return 0;
}
return -EBADF;
}
static int make_node(struct data *data, struct spa_node **node, const char *lib, const char *name)
{
struct spa_handle *handle = NULL;
void *iface;
int res;
if ((res = load_handle(data, &handle, lib, name)) < 0)
return res;
if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_Node, &iface)) < 0) {
printf("can't get interface %d\n", res);
return res;
}
*node = iface;
return 0;
}
static int on_source_ready(void *_data, int status)
{
struct data *data = _data;
int res;
struct buffer *b;
void *sdata, *ddata;
int sstride, dstride;
int i;
uint8_t *src, *dst;
struct spa_data *datas;
struct spa_io_buffers *io = &data->source_output[0];
if (io->status != SPA_STATUS_HAVE_DATA ||
io->buffer_id >= MAX_BUFFERS)
return -EINVAL;
b = &data->buffers[io->buffer_id];
io->status = SPA_STATUS_NEED_DATA;
datas = b->buffer.datas;
if (b->texture) {
SDL_Texture *texture = b->texture;
SDL_UnlockTexture(texture);
SDL_RenderClear(data->renderer);
SDL_RenderCopy(data->renderer, texture, NULL, NULL);
SDL_RenderPresent(data->renderer);
if (SDL_LockTexture(texture, NULL, &sdata, &sstride) < 0) {
fprintf(stderr, "Couldn't lock texture: %s\n", SDL_GetError());
return -EIO;
}
} else {
uint8_t *map;
if (SDL_LockTexture(data->texture, NULL, &ddata, &dstride) < 0) {
fprintf(stderr, "Couldn't lock texture: %s\n", SDL_GetError());
return -EIO;
}
sdata = datas[0].data;
if (datas[0].type == SPA_DATA_MemFd ||
datas[0].type == SPA_DATA_DmaBuf) {
map = mmap(NULL, datas[0].maxsize, PROT_READ,
MAP_PRIVATE, datas[0].fd, datas[0].mapoffset);
if (map == MAP_FAILED)
return -errno;
sdata = map;
} else if (datas[0].type == SPA_DATA_MemPtr) {
map = NULL;
sdata = datas[0].data;
} else
return -EIO;
sstride = datas[0].chunk->stride;
for (i = 0; i < 240; i++) {
src = ((uint8_t *) sdata + i * sstride);
dst = ((uint8_t *) ddata + i * dstride);
memcpy(dst, src, SPA_MIN(sstride, dstride));
}
SDL_UnlockTexture(data->texture);
SDL_RenderClear(data->renderer);
SDL_RenderCopy(data->renderer, data->texture, NULL, NULL);
SDL_RenderPresent(data->renderer);
if (map)
munmap(map, datas[0].maxsize);
}
if ((res = spa_node_process(data->source)) < 0)
printf("got process error %d\n", res);
return 0;
}
static const struct spa_node_callbacks source_callbacks = {
SPA_VERSION_NODE_CALLBACKS,
.ready = on_source_ready,
};
static int make_nodes(struct data *data, const char *device)
{
int res;
struct spa_pod *props;
struct spa_pod_builder b = { 0 };
uint8_t buffer[256];
uint32_t index;
if ((res =
make_node(data, &data->source,
"v4l2/libspa-v4l2.so",
SPA_NAME_API_V4L2_SOURCE)) < 0) {
printf("can't create v4l2-source: %d\n", res);
return res;
}
spa_node_set_callbacks(data->source, &source_callbacks, data);
index = 0;
spa_pod_builder_init(&b, buffer, sizeof(buffer));
if ((res = spa_node_enum_params_sync(data->source, SPA_PARAM_Props,
&index, NULL, &props, &b)) == 1) {
spa_debug_pod(0, NULL, props);
}
spa_pod_builder_init(&b, buffer, sizeof(buffer));
props = spa_pod_builder_add_object(&b,
SPA_TYPE_OBJECT_Props, 0,
SPA_PROP_device, SPA_POD_String(device ? device : "/dev/video0"));
if ((res = spa_node_set_param(data->source, SPA_PARAM_Props, 0, props)) < 0)
printf("got set_props error %d\n", res);
return res;
}
static int setup_buffers(struct data *data)
{
int i;
for (i = 0; i < MAX_BUFFERS; i++) {
struct buffer *b = &data->buffers[i];
data->bp[i] = &b->buffer;
b->texture = NULL;
b->buffer.metas = b->metas;
b->buffer.n_metas = 1;
b->buffer.datas = b->datas;
b->buffer.n_datas = 1;
b->header.flags = 0;
b->header.seq = 0;
b->header.pts = 0;
b->header.dts_offset = 0;
b->metas[0].type = SPA_META_Header;
b->metas[0].data = &b->header;
b->metas[0].size = sizeof(b->header);
b->datas[0].type = 0;
b->datas[0].flags = 0;
b->datas[0].fd = -1;
b->datas[0].mapoffset = 0;
b->datas[0].maxsize = 0;
b->datas[0].data = NULL;
b->datas[0].chunk = &b->chunks[0];
b->datas[0].chunk->offset = 0;
b->datas[0].chunk->size = 0;
b->datas[0].chunk->stride = 0;
}
data->n_buffers = MAX_BUFFERS;
return 0;
}
static int sdl_alloc_buffers(struct data *data)
{
int i;
for (i = 0; i < MAX_BUFFERS; i++) {
struct buffer *b = &data->buffers[i];
SDL_Texture *texture;
void *ptr;
int stride;
texture = SDL_CreateTexture(data->renderer,
SDL_PIXELFORMAT_YUY2,
SDL_TEXTUREACCESS_STREAMING, 320, 240);
if (!texture) {
printf("can't create texture: %s\n", SDL_GetError());
return -ENOMEM;
}
if (SDL_LockTexture(texture, NULL, &ptr, &stride) < 0) {
fprintf(stderr, "Couldn't lock texture: %s\n", SDL_GetError());
return -EIO;
}
b->texture = texture;
b->datas[0].type = SPA_DATA_MemPtr;
b->datas[0].maxsize = stride * 240;
b->datas[0].data = ptr;
b->datas[0].chunk->offset = 0;
b->datas[0].chunk->size = stride * 240;
b->datas[0].chunk->stride = stride;
}
return 0;
}
static int negotiate_formats(struct data *data)
{
int res;
struct spa_pod *format;
uint8_t buffer[256];
struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
data->source_output[0] = SPA_IO_BUFFERS_INIT;
if ((res =
spa_node_port_set_io(data->source,
SPA_DIRECTION_OUTPUT, 0,
SPA_IO_Buffers,
&data->source_output[0], sizeof(data->source_output[0]))) < 0)
return res;
format = spa_format_video_raw_build(&b, 0,
&SPA_VIDEO_INFO_RAW_INIT(
.format = SPA_VIDEO_FORMAT_YUY2,
.size = SPA_RECTANGLE(320, 240),
.framerate = SPA_FRACTION(25,1)));
if ((res = spa_node_port_set_param(data->source,
SPA_DIRECTION_OUTPUT, 0,
SPA_PARAM_Format, 0,
format)) < 0)
return res;
setup_buffers(data);
if (data->use_buffer) {
if ((res = sdl_alloc_buffers(data)) < 0)
return res;
if ((res = spa_node_port_use_buffers(data->source,
SPA_DIRECTION_OUTPUT, 0, 0,
data->bp, data->n_buffers)) < 0) {
printf("can't allocate buffers: %s\n", spa_strerror(res));
return -1;
}
} else {
unsigned int n_buffers;
data->texture = SDL_CreateTexture(data->renderer,
SDL_PIXELFORMAT_YUY2,
SDL_TEXTUREACCESS_STREAMING, 320, 240);
if (!data->texture) {
printf("can't create texture: %s\n", SDL_GetError());
return -1;
}
n_buffers = MAX_BUFFERS;
if ((res = spa_node_port_use_buffers(data->source,
SPA_DIRECTION_OUTPUT, 0,
SPA_NODE_BUFFERS_FLAG_ALLOC,
data->bp, n_buffers)) < 0) {
printf("can't allocate buffers: %s\n", spa_strerror(res));
return -1;
}
data->n_buffers = n_buffers;
}
return 0;
}
static void *loop(void *user_data)
{
struct data *data = user_data;
printf("enter thread\n");
spa_loop_control_enter(data->control);
while (data->running) {
spa_loop_control_iterate(data->control, -1);
}
printf("leave thread\n");
spa_loop_control_leave(data->control);
return NULL;
}
static void run_async_source(struct data *data)
{
int res, err;
struct spa_command cmd;
SDL_Event event;
bool running = true;
cmd = SPA_NODE_COMMAND_INIT(SPA_NODE_COMMAND_Start);
if ((res = spa_node_send_command(data->source, &cmd)) < 0)
printf("got error %d\n", res);
spa_loop_control_leave(data->control);
data->running = true;
if ((err = pthread_create(&data->thread, NULL, loop, data)) != 0) {
printf("can't create thread: %d %s", err, strerror(err));
data->running = false;
}
while (running && SDL_WaitEvent(&event)) {
switch (event.type) {
case SDL_QUIT:
running = false;
break;
}
}
if (data->running) {
data->running = false;
pthread_join(data->thread, NULL);
}
spa_loop_control_enter(data->control);
cmd = SPA_NODE_COMMAND_INIT(SPA_NODE_COMMAND_Pause);
if ((res = spa_node_send_command(data->source, &cmd)) < 0)
printf("got error %d\n", res);
}
int main(int argc, char *argv[])
{
struct data data = { 0 };
int res;
const char *str;
struct spa_handle *handle = NULL;
void *iface;
if ((str = getenv("SPA_PLUGIN_DIR")) == NULL)
str = PLUGINDIR;
data.plugin_dir = str;
if ((res = load_handle(&data, &handle,
"support/libspa-support.so",
SPA_NAME_SUPPORT_SYSTEM)) < 0)
return res;
if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_System, &iface)) < 0) {
printf("can't get System interface %d\n", res);
return res;
}
data.system = iface;
data.support[data.n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_System, data.system);
if ((res = load_handle(&data, &handle,
"support/libspa-support.so",
SPA_NAME_SUPPORT_LOOP)) < 0)
return res;
if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_Loop, &iface)) < 0) {
printf("can't get interface %d\n", res);
return res;
}
data.loop = iface;
if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_LoopControl, &iface)) < 0) {
printf("can't get interface %d\n", res);
return res;
}
data.control = iface;
data.use_buffer = true;
data.log = &default_log.log;
if ((str = getenv("SPA_DEBUG")))
data.log->level = atoi(str);
data.support[data.n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_Log, data.log);
data.support[data.n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_Loop, data.loop);
data.support[data.n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_DataLoop, data.loop);
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
printf("can't initialize SDL: %s\n", SDL_GetError());
return -1;
}
if (SDL_CreateWindowAndRenderer
(320, 240, SDL_WINDOW_RESIZABLE, &data.window, &data.renderer)) {
printf("can't create window: %s\n", SDL_GetError());
return -1;
}
if ((res = make_nodes(&data, argv[1])) < 0) {
printf("can't make nodes: %d\n", res);
return -1;
}
if ((res = negotiate_formats(&data)) < 0) {
printf("can't negotiate nodes: %d\n", res);
return -1;
}
spa_loop_control_enter(data.control);
run_async_source(&data);
spa_loop_control_leave(data.control);
SDL_DestroyRenderer(data.renderer);
return 0;
}
pod.h
spa/debug/pod.h
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_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_pod
static int spa_debug_pod(int indent, const struct spa_type_info *info, const struct spa_pod *pod)
Definition pod.h:198
spa_handle_factory_enum_func_t
int(* spa_handle_factory_enum_func_t)(const struct spa_handle_factory **factory, uint32_t *index)
The function signature of the entry point in a plugin.
Definition plugin.h:182
SPA_HANDLE_FACTORY_ENUM_FUNC_NAME
#define SPA_HANDLE_FACTORY_ENUM_FUNC_NAME
Definition plugin.h:186
SPA_SUPPORT_INIT
#define SPA_SUPPORT_INIT(type, data)
Definition plugin.h:95
spa_handle_factory_init
#define spa_handle_factory_init(h,...)
Definition plugin.h:170
spa_handle_get_interface
#define spa_handle_get_interface(h,...)
Definition plugin.h:60
spa_handle_factory_get_size
#define spa_handle_factory_get_size(h,...)
Definition plugin.h:169
SPA_LOG_IMPL
#define SPA_LOG_IMPL(name)
Definition log-impl.h:119
SPA_TYPE_INTERFACE_Log
#define SPA_TYPE_INTERFACE_Log
The Log interface.
Definition log.h:58
spa_loop_control_enter
#define spa_loop_control_enter(l)
Enter a loop.
Definition loop.h:292
spa_loop_control_leave
#define spa_loop_control_leave(l)
Leave a loop.
Definition loop.h:295
spa_loop_control_iterate
#define spa_loop_control_iterate(l,...)
Perform one iteration of the loop.
Definition loop.h:298
SPA_TYPE_INTERFACE_DataLoop
#define SPA_TYPE_INTERFACE_DataLoop
Definition loop.h:33
SPA_TYPE_INTERFACE_Loop
#define SPA_TYPE_INTERFACE_Loop
Definition loop.h:31
SPA_TYPE_INTERFACE_LoopControl
#define SPA_TYPE_INTERFACE_LoopControl
Definition loop.h:39
SPA_NAME_SUPPORT_LOOP
#define SPA_NAME_SUPPORT_LOOP
A Loop/LoopControl/LoopUtils interface.
Definition names.h:34
SPA_NAME_SUPPORT_SYSTEM
#define SPA_NAME_SUPPORT_SYSTEM
A System interface.
Definition names.h:37
SPA_NAME_API_V4L2_SOURCE
#define SPA_NAME_API_V4L2_SOURCE
a v4l2 Node interface for capturing
Definition names.h:163
spa_node_enum_params_sync
static int spa_node_enum_params_sync(struct spa_node *node, uint32_t id, uint32_t *index, const struct spa_pod *filter, struct spa_pod **param, struct spa_pod_builder *builder)
Definition utils.h:45
SPA_STATUS_HAVE_DATA
#define SPA_STATUS_HAVE_DATA
Definition io.h:86
SPA_TYPE_INTERFACE_Node
#define SPA_TYPE_INTERFACE_Node
Definition node.h:37
SPA_VERSION_NODE_CALLBACKS
#define SPA_VERSION_NODE_CALLBACKS
Definition node.h:234
SPA_STATUS_NEED_DATA
#define SPA_STATUS_NEED_DATA
Definition io.h:84
spa_node_port_set_io
#define spa_node_port_set_io(n,...)
Configure the given memory area with id on port_id.
Definition node.h:758
spa_node_process
#define spa_node_process(n)
Process the node.
Definition node.h:766
spa_node_set_param
#define spa_node_set_param(n,...)
Set the configurable parameter in node.
Definition node.h:734
spa_node_port_set_param
#define spa_node_port_set_param(n,...)
Set a parameter on port_id of node.
Definition node.h:752
spa_node_send_command
#define spa_node_send_command(n,...)
Send a command to a node.
Definition node.h:740
SPA_IO_BUFFERS_INIT
#define SPA_IO_BUFFERS_INIT
Definition io.h:96
SPA_NODE_BUFFERS_FLAG_ALLOC
#define SPA_NODE_BUFFERS_FLAG_ALLOC
flags to pass to the use_buffers functions
Definition node.h:286
SPA_NODE_COMMAND_INIT
#define SPA_NODE_COMMAND_INIT(id)
Definition command.h:49
spa_node_port_use_buffers
#define spa_node_port_use_buffers(n,...)
Tell the port to use the given buffers.
Definition node.h:755
spa_node_set_callbacks
#define spa_node_set_callbacks(n,...)
Set callbacks to on node.
Definition node.h:725
SPA_IO_Buffers
@ SPA_IO_Buffers
area to exchange buffers, struct spa_io_buffers
Definition io.h:38
SPA_NODE_COMMAND_Pause
@ SPA_NODE_COMMAND_Pause
pause a node.
Definition command.h:28
SPA_NODE_COMMAND_Start
@ SPA_NODE_COMMAND_Start
start a node, this makes it start emitting scheduling events
Definition command.h:30
spa_format_video_raw_build
static struct spa_pod * spa_format_video_raw_build(struct spa_pod_builder *builder, uint32_t id, const struct spa_video_info_raw *info)
Definition raw-utils.h:58
SPA_VIDEO_INFO_RAW_INIT
#define SPA_VIDEO_INFO_RAW_INIT(...)
Definition raw.h:200
SPA_PROP_device
@ SPA_PROP_device
Definition props.h:47
SPA_PARAM_Format
@ SPA_PARAM_Format
configured format as SPA_TYPE_OBJECT_Format
Definition param.h:34
SPA_PARAM_Props
@ SPA_PARAM_Props
properties as SPA_TYPE_OBJECT_Props
Definition param.h:32
SPA_VIDEO_FORMAT_YUY2
@ SPA_VIDEO_FORMAT_YUY2
Definition raw.h:49
SPA_POD_String
#define SPA_POD_String(val)
Definition vararg.h:94
SPA_POD_BUILDER_INIT
#define SPA_POD_BUILDER_INIT(buffer, size)
Definition builder.h:62
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_strerror
#define spa_strerror(err)
Definition result.h:49
spa_streq
static bool spa_streq(const char *s1, const char *s2)
Definition string.h:41
SPA_TYPE_INTERFACE_System
#define SPA_TYPE_INTERFACE_System
a collection of core system functions
Definition system.h:39
SPA_TYPE_OBJECT_Props
@ SPA_TYPE_OBJECT_Props
Definition type.h:75
spa_aprintf
#define spa_aprintf(_fmt,...)
Definition defs.h:503
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
SPA_DIRECTION_OUTPUT
@ SPA_DIRECTION_OUTPUT
Definition defs.h:108
io.h
spa/node/io.h
log-impl.h
spa/support/log-impl.h
names.h
spa/utils/names.h
param.h
spa/param/param.h
plugin.h
spa/support/plugin.h
props.h
result.h
spa/utils/result.h
node.h
spa/node/node.h
utils.h
loop.h
spa/support/loop.h
string.h
spa/utils/string.h
spa_buffer
A Buffer.
Definition buffer.h:100
spa_chunk
Chunk of memory, can change for each buffer.
Definition buffer.h:49
spa_chunk::stride
int32_t stride
stride of valid data
Definition buffer.h:55
spa_command
Definition command.h:29
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::data
void * data
optional data pointer
Definition buffer.h:95
spa_handle_factory
Definition plugin.h:97
spa_handle_factory::version
uint32_t version
Definition plugin.h:101
spa_handle
Definition plugin.h:30
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:80
spa_io_buffers::status
int32_t status
the status code
Definition io.h:91
spa_io_buffers::buffer_id
uint32_t buffer_id
a buffer id
Definition io.h:92
spa_log
Definition log.h:61
spa_loop_control
Definition loop.h:42
spa_loop
Definition loop.h:36
spa_meta_header
Describes essential buffer header metadata such as flags and timestamps.
Definition meta.h:68
spa_meta
A metadata element.
Definition meta.h:48
spa_node_callbacks
Node callbacks.
Definition node.h:232
spa_node
Definition node.h:41
spa_pod_builder
Definition builder.h:53
spa_pod_builder::size
uint32_t size
Definition builder.h:55
spa_pod
Definition pod.h:43
spa_support
Extra supporting infrastructure passed to the init() function of a factory.
Definition plugin.h:76
spa_system
Definition system.h:45