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Add display sink: START_DISPLAY/STOP_DISPLAY, multi-window xorg, random port

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Protocol:
- Add PROTO_CMD_START_DISPLAY (0x000A) and PROTO_CMD_STOP_DISPLAY (0x000B)
  with write/read functions; Proto_Start_Display carries stream_id, window
  position/size, scale and anchor; PROTO_DISPLAY_SCALE_*/ANCHOR_* constants

Node display sink:
- Display_Slot struct with wanted_state/current_state (DISP_CLOSED/DISP_OPEN);
  handlers set wanted state, display_loop_tick on main thread reconciles
- Up to MAX_DISPLAYS (4) simultaneous viewer windows
- on_frame routes incoming VIDEO_FRAME messages to matching display slot;
  transport thread deposits payload, main thread consumes without holding lock
  during JPEG decode/upload
- Main thread runs GL event loop when xorg is available; headless fallback
  joins reconciler timer thread as before

Xorg multi-window:
- Ref-count glfwInit/glfwTerminate via glfw_acquire/glfw_release so closing
  one viewer does not terminate GLFW for remaining windows
- Add glfwMakeContextCurrent before GL calls in push_yuv420, push_bgra,
  push_mjpeg and poll so each viewer uses its own GL context correctly

Transport random port:
- Bind port 0 lets the OS assign a free port; getsockname reads it back
  into server->bound_port after bind
- Add transport_server_get_port() accessor
- Default tcp_port changed from 8000 to 0 (random); node prints actual
  port after server start so it is always visible in output
- Add --port PORT CLI override (before config-file argument)

controller_cli:
- Add start-display and stop-display commands

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
mikael-lovqvists-claude-agent
2026-03-29 08:03:21 +00:00
parent 28216999e0
commit 32d31cbd1e
6 changed files with 199 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

59
src/modules/protocol/protocol.c
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@@ -601,6 +601,65 @@ struct App_Error proto_read_stop_ingest(
return APP_OK;
}
/* START_DISPLAY: request_id(2) cmd(2) stream_id(2) win_x(2) win_y(2)
* win_w(2) win_h(2) scale(1) anchor(1) = 16 bytes */
struct App_Error proto_write_start_display(struct Transport_Conn *conn,
uint16_t request_id, uint16_t stream_id,
int16_t win_x, int16_t win_y, uint16_t win_w, uint16_t win_h,
uint8_t scale, uint8_t anchor)
{
uint8_t buf[16];
uint32_t o = 0;
put_u16(buf, o, request_id); o += 2;
put_u16(buf, o, PROTO_CMD_START_DISPLAY); o += 2;
put_u16(buf, o, stream_id); o += 2;
put_i16(buf, o, win_x); o += 2;
put_i16(buf, o, win_y); o += 2;
put_u16(buf, o, win_w); o += 2;
put_u16(buf, o, win_h); o += 2;
put_u8 (buf, o, scale); o += 1;
put_u8 (buf, o, anchor); o += 1;
(void)o;
return transport_send_frame(conn, PROTO_MSG_CONTROL_REQUEST, buf, 16);
}
struct App_Error proto_write_stop_display(struct Transport_Conn *conn,
uint16_t request_id, uint16_t stream_id)
{
uint8_t buf[6];
put_u16(buf, 0, request_id);
put_u16(buf, 2, PROTO_CMD_STOP_DISPLAY);
put_u16(buf, 4, stream_id);
return transport_send_frame(conn, PROTO_MSG_CONTROL_REQUEST, buf, 6);
}
struct App_Error proto_read_start_display(
const uint8_t *payload, uint32_t length,
struct Proto_Start_Display *out)
{
if (length < 16) { return APP_INVALID_ERROR_MSG(0, "START_DISPLAY payload too short"); }
out->request_id = get_u16(payload, 0);
/* skip command word at [2..3] */
out->stream_id = get_u16(payload, 4);
out->win_x = get_i16(payload, 6);
out->win_y = get_i16(payload, 8);
out->win_w = get_u16(payload, 10);
out->win_h = get_u16(payload, 12);
out->scale = get_u8 (payload, 14);
out->anchor = get_u8 (payload, 15);
return APP_OK;
}
struct App_Error proto_read_stop_display(
const uint8_t *payload, uint32_t length,
struct Proto_Stop_Display *out)
{
if (length < 6) { return APP_INVALID_ERROR_MSG(0, "STOP_DISPLAY payload too short"); }
out->request_id = get_u16(payload, 0);
out->stream_id = get_u16(payload, 4);
return APP_OK;
}
struct App_Error proto_read_response_header(
const uint8_t *payload, uint32_t length,
struct Proto_Response_Header *out)