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example: add example of renegotiation

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Add an example of renegotiating a producer and consumer format.
This commit is contained in:
Wim Taymans 2020-06-19 12:17:47 +02:00
parent 0dad6c5852
commit 93e04aebce
3 changed files with 925 additions and 0 deletions
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14
src/examples/meson.build
View file

@ -12,6 +12,13 @@ executable('video-src-alloc',
install_dir : join_paths(installed_tests_execdir, 'examples'),
dependencies : [pipewire_dep, mathlib],
)
executable('video-src-reneg',
'video-src-reneg.c',
c_args : [ '-D_GNU_SOURCE' ],
install : installed_tests_enabled,
install_dir : join_paths(installed_tests_execdir, 'examples'),
dependencies : [pipewire_dep, mathlib],
)
executable('audio-src',
'audio-src.c',
c_args : [ '-D_GNU_SOURCE' ],
@ -97,6 +104,13 @@ if sdl_dep.found()
install_dir : join_paths(installed_tests_execdir, 'examples'),
dependencies : [pipewire_dep, sdl_dep, mathlib],
)
executable('video-play-reneg',
'video-play-reneg.c',
c_args : [ '-D_GNU_SOURCE' ],
install : installed_tests_enabled,
install_dir : join_paths(installed_tests_execdir, 'examples'),
dependencies : [pipewire_dep, sdl_dep, mathlib],
)
executable('video-dsp-play',
'video-dsp-play.c',
c_args : [ '-D_GNU_SOURCE' ],

422
src/examples/video-play-reneg.c Normal file
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@ -0,0 +1,422 @@
/* PipeWire
*
* Copyright © 2020 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.
*/
#include <stdio.h>
#include <unistd.h>
#include <signal.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
#include "sdl.h"
struct pixel {
float r, g, b, a;
};
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 *timer;
struct pw_stream *stream;
struct spa_hook stream_listener;
struct spa_video_info format;
int32_t stride;
struct spa_rectangle size;
int 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;
}
}
}
/* 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 ((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;
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:
pw_loop_update_timer(pw_main_loop_get_loop(data->loop),
data->timer, NULL, NULL, false);
break;
case PW_STREAM_STATE_STREAMING:
{
struct timespec timeout, interval;
timeout.tv_sec = 1;
timeout.tv_nsec = 0;
interval.tv_sec = 1;
interval.tv_nsec = 0;
pw_loop_update_timer(pw_main_loop_get_loop(data->loop),
data->timer, &timeout, &interval, false);
}
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;
}
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_align, SPA_POD_Int(16));
/* 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_format(struct data *data, struct spa_pod_builder *b, const struct spa_pod **params)
{
SDL_RendererInfo info;
SDL_GetRendererInfo(data->renderer, &info);
params[0] = sdl_build_formats(&info, b);
fprintf(stderr, "supported SDL formats:\n");
spa_debug_format(2, NULL, params[0]);
return 1;
}
static int reneg_format(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];
int32_t width, height;
if (data->format.info.raw.format == 0)
return -EBUSY;
width = data->counter & 1 ? 320 : 640;
height = data->counter & 1 ? 240 : 480;
fprintf(stderr, "renegotiate to %dx%d:\n", width, height);
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(data->format.info.raw.format),
SPA_FORMAT_VIDEO_size, SPA_POD_Rectangle(&SPA_RECTANGLE(width, height)),
SPA_FORMAT_VIDEO_framerate, SPA_POD_Fraction(&data->format.info.raw.framerate));
pw_stream_update_params(data->stream, params, 1);
data->counter++;
return 0;
}
static int reneg_buffers(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];
fprintf(stderr, "renegotiate buffers\n");
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_align, SPA_POD_Int(16));
pw_stream_update_params(data->stream, params, 1);
data->counter++;
return 0;
}
static void on_timeout(void *userdata, uint64_t expirations)
{
struct data *data = userdata;
if (1)
reneg_format(data);
else
reneg_buffers(data);
}
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));
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.
*/
data.stream = pw_stream_new_simple(
pw_main_loop_get_loop(data.loop),
"video-play-reneg",
pw_properties_new(
PW_KEY_MEDIA_TYPE, "Video",
PW_KEY_MEDIA_CATEGORY, "Capture",
PW_KEY_MEDIA_ROLE, "Camera",
NULL),
&stream_events,
&data);
data.path = argc > 1 ? argv[1] : NULL;
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;
}
/* 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. */
n_params = build_format(&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,
data.path ? (uint32_t)atoi(data.path) : 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.timer = pw_loop_add_timer(pw_main_loop_get_loop(data.loop), on_timeout, &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);
SDL_DestroyTexture(data.texture);
if (data.cursor)
SDL_DestroyTexture(data.cursor);
SDL_DestroyRenderer(data.renderer);
SDL_DestroyWindow(data.window);
pw_deinit();
return 0;
}

489
src/examples/video-src-reneg.c Normal file
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@ -0,0 +1,489 @@
/* PipeWire
*
* Copyright © 2020 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.
*/
#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 spa_source *reneg_timer;
struct pw_stream *stream;
struct spa_hook stream_listener;
struct spa_video_info_raw format;
int32_t stride;
int counter;
int cycle;
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 on timeout and we should push a new buffer in the queue */
static void on_timeout(void *userdata, uint64_t expirations)
{
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;
pw_log_trace("timeout");
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
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
h->pts = SPA_TIMESPEC_TO_NSEC(&now);
#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 = data->crop;
mc->region.position.y = data->crop;
mc->region.size.width = data->format.size.width - data->crop*2;
mc->region.size.height = data->format.size.height - 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 = (sin(data->accumulator) + 1.0) * 160.0 + 80;
mcs->position.y = (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_MEMBER(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_MEMBER(mb, mb->offset, uint32_t);
color = (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);
}
/* 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);
pw_loop_update_timer(pw_thread_loop_get_loop(data->loop),
data->reneg_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;
pw_loop_update_timer(pw_thread_loop_get_loop(data->loop),
data->timer, &timeout, &interval, false);
timeout.tv_sec = 1;
timeout.tv_nsec = 0;
interval.tv_sec = 1;
interval.tv_nsec = 0;
pw_loop_update_timer(pw_thread_loop_get_loop(data->loop),
data->reneg_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;
unsigned int seals;
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;
#ifndef __FreeBSD__
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;
}
#ifndef __FreeBSD__
/* 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_align, SPA_POD_Int(16),
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,
.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 on_reneg_timeout(void *userdata, uint64_t expirations)
{
struct data *data = userdata;
uint8_t buffer[1024];
struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
const struct spa_pod *params[2];
int32_t width, height;
width = data->cycle & 1 ? 320 : 640;
height = data->cycle & 1 ? 240 : 480;
fprintf(stderr, "renegotiate to %dx%d:\n", width, height);
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_Rectangle(&SPA_RECTANGLE(width, height)),
SPA_FORMAT_VIDEO_framerate, SPA_POD_Fraction(&SPA_FRACTION(25, 1)));
pw_stream_update_params(data->stream, params, 1);
data->cycle++;
}
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);
/* make a timer to schedule renegotiation */
data.reneg_timer = pw_loop_add_timer(pw_thread_loop_get_loop(data.loop),
on_reneg_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, /* link to any node */
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;
}