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examples: Make fixate examples start inactive

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The actual formats are sent just before activating. This is done in
preparation for supporting device ID negotiation.
This commit is contained in:
Jonas Ådahl 2025-11-11 12:22:21 +01:00 • committed by Wim Taymans
parent 58b958860e
commit fc5b43a0b0
2 changed files with 130 additions and 19 deletions
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68
src/examples/video-play-fixate.c
View file

@ -18,6 +18,7 @@
#include <spa/param/video/format-utils.h>
#include <spa/param/props.h>
#include <spa/debug/format.h>
#include <spa/debug/pod.h>
#include <pipewire/pipewire.h>
@ -68,8 +69,12 @@ struct data {
struct modifier_info mod_info[2];
int counter;
bool capabilities_known;
};
static int build_formats(struct data *data, struct spa_pod_builder *b, const struct spa_pod **params);
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,
@ -278,6 +283,34 @@ static void on_stream_state_changed(void *_data, enum pw_stream_state old,
}
}
static void
on_stream_tag_changed(struct data *data, const struct spa_pod *param)
{
struct pw_stream *stream = data->stream;
printf("tag param changed: \n");
spa_debug_pod(4, NULL, param);
if (!data->capabilities_known) {
const struct spa_pod *params[2];
uint32_t n_params = 0;
uint8_t buffer[1024];
struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
data->capabilities_known = true;
/* 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);
pw_stream_update_params(data->stream, params, n_params);
printf("activating stream\n");
pw_stream_set_active(stream, true);
}
}
/* Be notified when the stream format param changes.
*
* We are now supposed to call pw_stream_finish_format() with success or
@ -357,6 +390,9 @@ on_stream_param_changed(void *_data, uint32_t id, const struct spa_pod *param)
return;
switch (id) {
case SPA_PARAM_Tag:
on_stream_tag_changed(data, param);
break;
case SPA_PARAM_Format:
on_stream_format_changed(data, param);
break;
@ -421,8 +457,10 @@ int main(int argc, char *argv[])
const struct spa_pod *params[2];
uint8_t buffer[1024];
struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
struct spa_pod_frame f;
struct pw_properties *props;
int res, n_params;
int res, n_params = 0;
SDL_RendererInfo info;
pw_init(&argc, &argv);
@ -472,11 +510,28 @@ int main(int argc, char *argv[])
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);
SDL_GetRendererInfo(data.renderer, &info);
/* Push bare minimum video format to inactive stream, and wait for
* sending actual format until capability discovery is done. */
spa_pod_builder_push_object(&b, &f, 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);
spa_pod_builder_add(&b, SPA_FORMAT_VIDEO_format,
SPA_POD_Id(SPA_VIDEO_FORMAT_RGBA),
0);
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);
params[n_params++] = spa_pod_builder_pop(&b, &f);
/* now connect the stream, we need a direction (input/output),
* an optional target node to connect to, some flags and parameters
@ -485,6 +540,7 @@ int main(int argc, char *argv[])
PW_DIRECTION_INPUT,
PW_ID_ANY,
PW_STREAM_FLAG_AUTOCONNECT | /* try to automatically connect this stream */
PW_STREAM_FLAG_INACTIVE | /* set active after capability discovery */
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));