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mISDN: Add feature via MISDN_CTRL_FILL_EMPTY to fill fifo if empty

Forráskód böngészése 
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>
This commit is contained in:
Andreas Eversberg
2008-08-02 22:51:52 +02:00
committed by Karsten Keil
szülő 69e656cc16
commit 8dd2f36f31
9 fájl változott, egészen pontosan 165 új sor hozzáadva és 45 régi sor törölve
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56
drivers/isdn/mISDN/dsp_cmx.c
Fájl megtekintése

@@ -1168,11 +1168,18 @@ dsp_cmx_receive(struct dsp *dsp, struct sk_buff *skb)
dsp->rx_init = 0;
if (dsp->features.unordered) {
dsp->rx_R = (hh->id & CMX_BUFF_MASK);
dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
& CMX_BUFF_MASK;
if (dsp->cmx_delay)
dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
& CMX_BUFF_MASK;
else
dsp->rx_W = (dsp->rx_R + (dsp_poll >> 1))
& CMX_BUFF_MASK;
} else {
dsp->rx_R = 0;
dsp->rx_W = dsp->cmx_delay;
if (dsp->cmx_delay)
dsp->rx_W = dsp->cmx_delay;
else
dsp->rx_W = dsp_poll >> 1;
}
}
/* if frame contains time code, write directly */
@@ -1190,14 +1197,20 @@ dsp_cmx_receive(struct dsp *dsp, struct sk_buff *skb)
"cmx_receive(dsp=%lx): UNDERRUN (or overrun the "
"maximum delay), adjusting read pointer! "
"(inst %s)\n", (u_long)dsp, dsp->name);
/* flush buffer */
/* flush rx buffer and set delay to dsp_poll / 2 */
if (dsp->features.unordered) {
dsp->rx_R = (hh->id & CMX_BUFF_MASK);
dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
& CMX_BUFF_MASK;
if (dsp->cmx_delay)
dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
& CMX_BUFF_MASK;
dsp->rx_W = (dsp->rx_R + (dsp_poll >> 1))
& CMX_BUFF_MASK;
} else {
dsp->rx_R = 0;
dsp->rx_W = dsp->cmx_delay;
if (dsp->cmx_delay)
dsp->rx_W = dsp->cmx_delay;
else
dsp->rx_W = dsp_poll >> 1;
}
memset(dsp->rx_buff, dsp_silence, sizeof(dsp->rx_buff));
}
@@ -1360,8 +1373,11 @@ dsp_cmx_send_member(struct dsp *dsp, int len, s32 *c, int members)
t = (t+1) & CMX_BUFF_MASK;
r = (r+1) & CMX_BUFF_MASK;
}
if (r != rr)
if (r != rr) {
printk(KERN_DEBUG "%s: buffer empty\n",
__func__);
memset(d, dsp_silence, (rr-r)&CMX_BUFF_MASK);
}
/* -> if echo is enabled */
} else {
/*
@@ -1704,9 +1720,10 @@ dsp_cmx_send(void *arg)
}
/*
* remove rx_delay only if we have delay AND we
* have not preset cmx_delay
* have not preset cmx_delay AND
* the delay is greater dsp_poll
*/
if (delay && !dsp->cmx_delay) {
if (delay > dsp_poll && !dsp->cmx_delay) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG
"%s lowest rx_delay of %d bytes for"
@@ -1714,7 +1731,8 @@ dsp_cmx_send(void *arg)
__func__, delay,
dsp->name);
r = dsp->rx_R;
rr = (r + delay) & CMX_BUFF_MASK;
rr = (r + delay - (dsp_poll >> 1))
& CMX_BUFF_MASK;
/* delete rx-data */
while (r != rr) {
p[r] = dsp_silence;
@@ -1736,7 +1754,7 @@ dsp_cmx_send(void *arg)
* remove delay only if we have delay AND we
* have enabled tx_dejitter
*/
if (delay && dsp->tx_dejitter) {
if (delay > dsp_poll && dsp->tx_dejitter) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG
"%s lowest tx_delay of %d bytes for"
@@ -1744,7 +1762,8 @@ dsp_cmx_send(void *arg)
__func__, delay,
dsp->name);
r = dsp->tx_R;
rr = (r + delay) & CMX_BUFF_MASK;
rr = (r + delay - (dsp_poll >> 1))
& CMX_BUFF_MASK;
/* delete tx-data */
while (r != rr) {
q[r] = dsp_silence;
@@ -1797,14 +1816,13 @@ dsp_cmx_transmit(struct dsp *dsp, struct sk_buff *skb)
ww = dsp->tx_R;
p = dsp->tx_buff;
d = skb->data;
space = ww-w;
if (space <= 0)
space += CMX_BUFF_SIZE;
space = (ww - w - 1) & CMX_BUFF_MASK;
/* write-pointer should not overrun nor reach read pointer */
if (space-1 < skb->len)
if (space < skb->len) {
/* write to the space we have left */
ww = (ww - 1) & CMX_BUFF_MASK;
else
ww = (ww - 1) & CMX_BUFF_MASK; /* end one byte prior tx_R */
printk(KERN_DEBUG "%s: buffer overflow\n", __func__);
} else
/* write until all byte are copied */
ww = (w + skb->len) & CMX_BUFF_MASK;
dsp->tx_W = ww;