mISDN: Add feature via MISDN_CTRL_FILL_EMPTY to fill fifo if empty

This prevents underrun of fifo when filled and in case of an underrun it
prevents subsequent underruns due to jitter.
Improve dsp, so buffers are kept filled with a certain delay, so moderate
jitter will not cause underrun all the time -> the audio quality is highly
improved. tones are not interrupted by gaps anymore, except when CPU is
stalling or in high load.

Signed-off-by: Andreas Eversberg <andreas@eversberg.eu>
Signed-off-by: Karsten Keil <kkeil@suse.de>

1 files changed, 13 insertions, 12 deletions

diff --git a/include/linux/mISDNhw.h b/include/linux/mISDNhw.h
index e794dfb..9384b92 100644
--- a/include/linux/mISDNhw.h
+++ b/include/linux/mISDNhw.h
@@ -57,20 +57,21 @@
 #define FLG_L2DATA		14	/* channel use L2 DATA primitivs */
 #define FLG_ORIGIN		15	/* channel is on origin site */
 /* channel specific stuff */
+#define FLG_FILLEMPTY		16	/* fill fifo on first frame (empty) */
 /* arcofi specific */
-#define FLG_ARCOFI_TIMER	16
-#define FLG_ARCOFI_ERROR	17
+#define FLG_ARCOFI_TIMER	17
+#define FLG_ARCOFI_ERROR	18
 /* isar specific */
-#define FLG_INITIALIZED		16
-#define FLG_DLEETX		17
-#define FLG_LASTDLE		18
-#define FLG_FIRST		19
-#define FLG_LASTDATA		20
-#define FLG_NMD_DATA		21
-#define FLG_FTI_RUN		22
-#define FLG_LL_OK		23
-#define FLG_LL_CONN		24
-#define FLG_DTMFSEND		25
+#define FLG_INITIALIZED		17
+#define FLG_DLEETX		18
+#define FLG_LASTDLE		19
+#define FLG_FIRST		20
+#define FLG_LASTDATA		21
+#define FLG_NMD_DATA		22
+#define FLG_FTI_RUN		23
+#define FLG_LL_OK		24
+#define FLG_LL_CONN		25
+#define FLG_DTMFSEND		26
 
 /* workq events */
 #define FLG_RECVQUEUE		30