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author | alfred <alfred@FreeBSD.org> | 2009-07-30 00:14:56 +0000 |
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committer | alfred <alfred@FreeBSD.org> | 2009-07-30 00:14:56 +0000 |
commit | 10ba0f506878eea2734223032f5d89657824d502 (patch) | |
tree | fb7b9e552eea9af75d0f8b48d735c270b46bee96 /sys/dev/sound | |
parent | e04ffbb8b67e9f6a83ea4fee6093b81757856740 (diff) | |
download | FreeBSD-src-10ba0f506878eea2734223032f5d89657824d502.zip FreeBSD-src-10ba0f506878eea2734223032f5d89657824d502.tar.gz |
USB audio:
- code factoring patch from "Eygene Ryabinkin"
- P4 ID: 166149
Submitted by: hps
Approved by: re
Diffstat (limited to 'sys/dev/sound')
-rw-r--r-- | sys/dev/sound/usb/uaudio.c | 78 |
1 files changed, 40 insertions, 38 deletions
diff --git a/sys/dev/sound/usb/uaudio.c b/sys/dev/sound/usb/uaudio.c index 83e0aa9..fe63e0d 100644 --- a/sys/dev/sound/usb/uaudio.c +++ b/sys/dev/sound/usb/uaudio.c @@ -108,6 +108,7 @@ SYSCTL_INT(_hw_usb_uaudio, OID_AUTO, default_channels, CTLFLAG_RW, #define UAUDIO_MINFRAMES 16 /* must be factor of 8 due HS-USB */ #define UAUDIO_NCHANBUFS 2 /* number of outstanding request */ #define UAUDIO_RECURSE_LIMIT 24 /* rounds */ +#define UAUDIO_MINFRAMES_ALIGN(x) ((x) & ~(UAUDIO_MINFRAMES - 1)) #define MAKE_WORD(h,l) (((h) << 8) | (l)) #define BIT_TEST(bm,bno) (((bm)[(bno) / 8] >> (7 - ((bno) % 8))) & 1) @@ -1113,6 +1114,41 @@ done: } } +/* + * The following function sets up data size and block count for the + * next audio transfer. + */ +static void +uaudio_setup_blockcount(struct uaudio_chan *ch, usb_frcount_t max_frames, + uint32_t *total, uint32_t *blockcount) +{ + uint32_t temp; + uint32_t isiz; + + /* allow dynamic sizing of play buffer */ + isiz = ch->intr_size; + + /* allow dynamic sizing of play buffer */ + temp = isiz / ch->bytes_per_frame; + + /* align units */ + temp = UAUDIO_MINFRAMES_ALIGN(temp); + + /* range check - min */ + if (temp == 0) + temp = UAUDIO_MINFRAMES; + + /* range check - max */ + if (temp > max_frames) + temp = max_frames; + + /* store blockcount */ + *blockcount = temp; + + /* compute the total length */ + *total = temp * ch->bytes_per_frame; +} + static void uaudio_chan_play_callback(struct usb_xfer *xfer, usb_error_t error) { @@ -1126,25 +1162,8 @@ uaudio_chan_play_callback(struct usb_xfer *xfer, usb_error_t error) usbd_xfer_status(xfer, &actlen, &sumlen, NULL, NULL); - /* allow dynamic sizing of play buffer */ - total = ch->intr_size; - - /* allow dynamic sizing of play buffer */ - blockcount = total / ch->bytes_per_frame; - - /* align units */ - blockcount -= (blockcount % UAUDIO_MINFRAMES); - - /* range check - min */ - if (blockcount == 0) { - blockcount = UAUDIO_MINFRAMES; - } - /* range check - max */ - if (blockcount > usbd_xfer_max_frames(xfer)) { - blockcount = usbd_xfer_max_frames(xfer); - } - /* compute the total length */ - total = blockcount * ch->bytes_per_frame; + uaudio_setup_blockcount(ch, usbd_xfer_max_frames(xfer), + &total, &blockcount); switch (USB_GET_STATE(xfer)) { case USB_ST_TRANSFERRED: @@ -1221,25 +1240,8 @@ uaudio_chan_record_callback(struct usb_xfer *xfer, usb_error_t error) usbd_xfer_status(xfer, &actlen, NULL, NULL, &nframes); - /* allow dynamic sizing of play buffer */ - total = ch->intr_size; - - /* allow dynamic sizing of play buffer */ - blockcount = total / ch->bytes_per_frame; - - /* align units */ - blockcount -= (blockcount % UAUDIO_MINFRAMES); - - /* range check - min */ - if (blockcount == 0) { - blockcount = UAUDIO_MINFRAMES; - } - /* range check - max */ - if (blockcount > usbd_xfer_max_frames(xfer)) { - blockcount = usbd_xfer_max_frames(xfer); - } - /* compute the total length */ - total = blockcount * ch->bytes_per_frame; + uaudio_setup_blockcount(ch, usbd_xfer_max_frames(xfer), + &total, &blockcount); switch (USB_GET_STATE(xfer)) { case USB_ST_TRANSFERRED: |