--- a/ater/tx_func.c	Wed Sep 25 05:53:38 2024 +0000
+++ b/ater/tx_func.c	Wed Sep 25 06:40:43 2024 +0000
@@ -137,38 +137,21 @@
 	memset(fr->d_bits, 1, 63 * 4);
 }
 
-static void d144_play_frame(struct ater_subslot *at, const uint8_t *filerec)
+static void d144_play_frame(ubit_t *out, const uint8_t *filerec)
 {
-	struct osmo_trau_frame *fr = &at->ul_frame;
-	struct msgb *msg;
-	int len;
-
-	msg = msgb_alloc_c(g_ctx, 320, "TRAU-UL-frame");
-	if (!msg)
-		return;
-	fr->type = OSMO_TRAU16_FT_EDATA;
-	fr->dir = OSMO_TRAU_DIR_UL;
-	fr->c_bits[5] = 0;
-	memset(fr->c_bits + 6, 1, 7);
-	fr->m_bits[0] = (filerec[1] & 2) >> 1;
-	fr->m_bits[1] = filerec[1] & 1;
-	osmo_pbit2ubit(fr->d_bits, filerec + 2, 288);
-	len = osmo_trau_frame_encode(msg->tail, msgb_tailroom(msg), fr);
-	if (len <= 0) {
-		msgb_free(msg);
-		return;
-	}
-	msgb_put(msg, len);
-	osmo_i460_mux_enqueue(at->schan, msg);
+	memset(out, 0, 16);
+	memset(out + 16, 1, 6);
+	out[22] = 0;
+	memset(out + 23, 1, 7);
+	out[30] = (filerec[1] & 2) >> 1;
+	out[31] = filerec[1] & 1;
+	osmo_pbit2ubit(out + 32, filerec + 2, 288);
 }
 
-static void handle_d144(int nr)
+static void d144_fill_frame(struct ater_subslot *at, ubit_t *out)
 {
-	struct ater_subslot *at = &subslots[nr];
-	struct msgb *msg;
-
 	if (at->play_buffer) {
-		d144_play_frame(at, at->play_buffer + at->play_buf_ptr * 38);
+		d144_play_frame(out, at->play_buffer + at->play_buf_ptr * 38);
 		at->play_buf_ptr++;
 		if (at->play_buf_ptr < at->play_buf_total)
 			return;
@@ -177,11 +160,18 @@
 		printf("file play finished\n");
 		return;
 	}
+	memcpy(out, at->d144_edata ? d144_idle_edata : d144_sync_frame, 320);
+}
+
+static void handle_d144(int nr)
+{
+	struct ater_subslot *at = &subslots[nr];
+	struct msgb *msg;
+
 	msg = msgb_alloc_c(g_ctx, 320, "TRAU-UL-frame");
 	if (!msg)
 		return;
-	memcpy(msg->tail, at->d144_edata ? d144_idle_edata : d144_sync_frame,
-		320);
+	d144_fill_frame(at, msg->tail);
 	msgb_put(msg, 320);
 	osmo_i460_mux_enqueue(at->schan, msg);
 }