camera-gstreamer: Add pipewire source to capture video streams

Pipewire can be used for capturing camera video streams, add it as one of the
sources and make it the default source.

V4L2 path can be chosen with an env variable.

Enhance the README file with info that helps with the usage of the app.

Bug-AGL: SPEC-4881
Change-Id: Ia1d989da229304b1b514d6b25ebbc2530503d370
Signed-off-by: Ashok Sidipotu <ashok.sidipotu@collabora.com>

1 files changed, 24 insertions, 8 deletions

diff --git a/app/main.cpp b/app/main.cpp
index 4451261..2068143 100644
--- a/app/main.cpp
+++ b/app/main.cpp
@@ -147,7 +147,7 @@ prune_old_released_buffers(struct window *window)
 
 	wl_list_for_each_safe(b, b_next,
 			      &window->buffer_list, buffer_link) {
-		if (!b->busy && (b->width != window->width || 
+		if (!b->busy && (b->width != window->width ||
 				 b->height != window->height))
 			destroy_buffer(b);
 	}
@@ -529,7 +529,7 @@ handle_xdg_toplevel_configure(void *data, struct xdg_toplevel *xdg_toplevel,
 
 	// use our own macro as C++ can't typecast from (void *) directly
 	WL_ARRAY_FOR_EACH(p, states, uint32_t *) {
-		uint32_t state = *p; 
+		uint32_t state = *p;
 		switch (state) {
 		case XDG_TOPLEVEL_STATE_FULLSCREEN:
 			window->fullscreen = 1;
@@ -713,6 +713,10 @@ int main(int argc, char *argv[])
 	int width;
 	int height;
 
+	// pipewire is default.
+	char *v4l2_path = getenv("ENABLE_V4L2_PATH");
+	bool v4l2 = false;
+
 	char pipeline_str[1024];
 	GError *error = NULL;
 	const char *app_id = "camera-gstreamer";
@@ -731,21 +735,33 @@ int main(int argc, char *argv[])
 	camera_device = getenv("DEFAULT_V4L2_DEVICE");
 	if (!camera_device)
 		camera_device = get_first_camera_device();
-	width_str = getenv("DEFAULT_V4L2_DEVICE_WIDTH");
+
+	width_str = getenv("DEFAULT_DEVICE_WIDTH");
 	if (!width_str)
 		width = WINDOW_WIDTH_SIZE;
 	else
 		width = atoi(width_str);
 
-	height_str = getenv("DEFAULT_V4L2_DEVICE_HEIGHT");
+	height_str = getenv("DEFAULT_DEVICE_HEIGHT");
 	if (!height_str)
 		height = WINDOW_HEIGHT_SIZE;
 	else
 		height = atoi(height_str);
 
+	if (v4l2_path == NULL)
+		v4l2 = false;
+	else if (g_str_equal(v4l2_path, "yes") || g_str_equal(v4l2_path, "true"))
+		v4l2 = true;
+
 	memset(pipeline_str, 0, sizeof(pipeline_str));
-	snprintf(pipeline_str, sizeof(pipeline_str), "v4l2src device=%s ! video/x-raw,width=%d,height=%d ! waylandsink", 
-		camera_device, width, height);
+
+	if (v4l2)
+		snprintf(pipeline_str, sizeof(pipeline_str), "v4l2src device=%s ! video/x-raw,width=%d,height=%d ! waylandsink",
+			camera_device, width, height);
+	else
+		snprintf(pipeline_str, sizeof(pipeline_str), "pipewiresrc ! video/x-raw,width=%d,height=%d ! waylandsink",
+      width, height);
+
 	gst_init(&gargc, &gargv);
 
 	setbuf(stdout, NULL);
@@ -766,7 +782,7 @@ int main(int argc, char *argv[])
 		return -1;
 
 	// if you'd want to place the video in a pop-up/dialog type of window:
-	// agl_shell_desktop_set_app_property(display->agl_shell_desktop, app_id, 
+	// agl_shell_desktop_set_app_property(display->agl_shell_desktop, app_id,
 	//				   AGL_SHELL_DESKTOP_APP_ROLE_POPUP,
 	//				   WINDOW_WIDTH_POS_X, WINDOW_WIDTH_POS_Y,
 	//				   0, 0, WINDOW_WIDTH_SIZE, WINDOW_HEIGHT_SIZE,
@@ -775,7 +791,7 @@ int main(int argc, char *argv[])
 	// we use the role to set a correspondence between the top level
 	// surface and our application, with the previous call letting the
 	// compositor know that we're one and the same
-	window = create_window(display, WINDOW_WIDTH_SIZE, WINDOW_HEIGHT_SIZE, app_id); 
+	window = create_window(display, WINDOW_WIDTH_SIZE, WINDOW_HEIGHT_SIZE, app_id);
 
 	if (!window) {
 		free(gargv);