mikael-lovqvists-claude-agent/video-setup
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Add no-signal animation to display windows

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When a viewer window has no incoming stream, renders animated analog-TV
noise (hash-based, scanlines, phosphor tint) at configurable fps (default
15) with a centred "NO SIGNAL" text overlay.

- xorg: FRAG_NOSIGNAL_SRC shader + xorg_viewer_render_no_signal(v, time, noise_res)
- main: Display_Slot gains no_signal_fps + last_no_signal_t; display_loop_tick
  drives no-signal render on idle slots via clock_gettime rate limiting
- protocol: START_DISPLAY extended by 2 bytes — no_signal_fps (0=default 15)
  + reserved; reader is backward-compatible (defaults 0 if length < 18)
- controller_cli: no_signal_fps optional arg on start-display
- docs: protocol.md updated with new field

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
mikael-lovqvists-claude-agent
2026-03-29 19:20:53 +00:00
parent 7808d832be
commit 54d48c9c8e
7 changed files with 158 additions and 31 deletions
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27
src/modules/protocol/protocol.c
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@@ -602,13 +602,13 @@ struct App_Error proto_read_stop_ingest(
}
/* 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 */
* win_w(2) win_h(2) scale(1) anchor(1) no_signal_fps(1) reserved(1) = 18 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 scale, uint8_t anchor, uint8_t no_signal_fps)
{
uint8_t buf[16];
uint8_t buf[18];
uint32_t o = 0;
put_u16(buf, o, request_id); o += 2;
put_u16(buf, o, PROTO_CMD_START_DISPLAY); o += 2;
@@ -619,8 +619,10 @@ struct App_Error proto_write_start_display(struct Transport_Conn *conn,
put_u16(buf, o, win_h); o += 2;
put_u8 (buf, o, scale); o += 1;
put_u8 (buf, o, anchor); o += 1;
put_u8 (buf, o, no_signal_fps); o += 1;
put_u8 (buf, o, 0); o += 1; /* reserved */
(void)o;
return transport_send_frame(conn, PROTO_MSG_CONTROL_REQUEST, buf, 16);
return transport_send_frame(conn, PROTO_MSG_CONTROL_REQUEST, buf, 18);
}
struct App_Error proto_write_stop_display(struct Transport_Conn *conn,
@@ -638,15 +640,16 @@ struct App_Error proto_read_start_display(
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);
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);
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);
out->no_signal_fps = length >= 18 ? get_u8(payload, 16) : 0;
return APP_OK;
}