diff options
Diffstat (limited to 'drivers/media/pci/ngene/ngene-dvb.c')
| -rw-r--r-- | drivers/media/pci/ngene/ngene-dvb.c | 151 |
1 files changed, 124 insertions, 27 deletions
diff --git a/drivers/media/pci/ngene/ngene-dvb.c b/drivers/media/pci/ngene/ngene-dvb.c index 03fc218..fee89b9 100644 --- a/drivers/media/pci/ngene/ngene-dvb.c +++ b/drivers/media/pci/ngene/ngene-dvb.c @@ -38,6 +38,9 @@ #include "ngene.h" +static int ci_tsfix = 1; +module_param(ci_tsfix, int, 0444); +MODULE_PARM_DESC(ci_tsfix, "Detect and fix TS buffer offset shifs in conjunction with CI expansions (default: 1/enabled)"); /****************************************************************************/ /* COMMAND API interface ****************************************************/ @@ -84,18 +87,41 @@ static ssize_t ts_read(struct file *file, char __user *buf, return count; } +static __poll_t ts_poll(struct file *file, poll_table *wait) +{ + struct dvb_device *dvbdev = file->private_data; + struct ngene_channel *chan = dvbdev->priv; + struct ngene *dev = chan->dev; + struct dvb_ringbuffer *rbuf = &dev->tsin_rbuf; + struct dvb_ringbuffer *wbuf = &dev->tsout_rbuf; + __poll_t mask = 0; + + poll_wait(file, &rbuf->queue, wait); + poll_wait(file, &wbuf->queue, wait); + + if (!dvb_ringbuffer_empty(rbuf)) + mask |= EPOLLIN | EPOLLRDNORM; + if (dvb_ringbuffer_free(wbuf) >= 188) + mask |= EPOLLOUT | EPOLLWRNORM; + + return mask; +} + static const struct file_operations ci_fops = { .owner = THIS_MODULE, .read = ts_read, .write = ts_write, .open = dvb_generic_open, .release = dvb_generic_release, + .poll = ts_poll, + .mmap = NULL, }; struct dvb_device ngene_dvbdev_ci = { - .readers = -1, - .writers = -1, - .users = -1, + .priv = NULL, + .readers = 1, + .writers = 1, + .users = 2, .fops = &ci_fops, }; @@ -116,47 +142,118 @@ static void swap_buffer(u32 *p, u32 len) /* start of filler packet */ static u8 fill_ts[] = { 0x47, 0x1f, 0xff, 0x10, TS_FILLER }; -/* #define DEBUG_CI_XFER */ -#ifdef DEBUG_CI_XFER -static u32 ok; -static u32 overflow; -static u32 stripped; -#endif +static int tsin_find_offset(void *buf, u32 len) +{ + int i, l; + + l = len - sizeof(fill_ts); + if (l <= 0) + return -1; + + for (i = 0; i < l; i++) { + if (((char *)buf)[i] == 0x47) { + if (!memcmp(buf + i, fill_ts, sizeof(fill_ts))) + return i % 188; + } + } + + return -1; +} + +static inline void tsin_copy_stripped(struct ngene *dev, void *buf) +{ + if (memcmp(buf, fill_ts, sizeof(fill_ts)) != 0) { + if (dvb_ringbuffer_free(&dev->tsin_rbuf) >= 188) { + dvb_ringbuffer_write(&dev->tsin_rbuf, buf, 188); + wake_up(&dev->tsin_rbuf.queue); + } + } +} void *tsin_exchange(void *priv, void *buf, u32 len, u32 clock, u32 flags) { struct ngene_channel *chan = priv; struct ngene *dev = chan->dev; - + int tsoff; if (flags & DF_SWAP32) swap_buffer(buf, len); if (dev->ci.en && chan->number == 2) { + /* blindly copy buffers if ci_tsfix is disabled */ + if (!ci_tsfix) { + while (len >= 188) { + tsin_copy_stripped(dev, buf); + + buf += 188; + len -= 188; + } + return NULL; + } + + /* ci_tsfix = 1 */ + + /* + * since the remainder of the TS packet which got cut off + * in the previous tsin_exchange() run is at the beginning + * of the new TS buffer, append this to the temp buffer and + * send it to the DVB ringbuffer afterwards. + */ + if (chan->tsin_offset) { + memcpy(&chan->tsin_buffer[(188 - chan->tsin_offset)], + buf, chan->tsin_offset); + tsin_copy_stripped(dev, &chan->tsin_buffer); + + buf += chan->tsin_offset; + len -= chan->tsin_offset; + } + + /* + * copy TS packets to the DVB ringbuffer and detect new offset + * shifts by checking for a valid TS SYNC byte + */ while (len >= 188) { - if (memcmp(buf, fill_ts, sizeof fill_ts) != 0) { - if (dvb_ringbuffer_free(&dev->tsin_rbuf) >= 188) { - dvb_ringbuffer_write(&dev->tsin_rbuf, buf, 188); - wake_up(&dev->tsin_rbuf.queue); -#ifdef DEBUG_CI_XFER - ok++; -#endif + if (*((char *)buf) != 0x47) { + /* + * no SYNC header, find new offset shift + * (max. 188 bytes, tsoff will be mod 188) + */ + tsoff = tsin_find_offset(buf, len); + if (tsoff > 0) { + chan->tsin_offset += tsoff; + chan->tsin_offset %= 188; + + buf += tsoff; + len -= tsoff; + + dev_info(&dev->pci_dev->dev, + "%s(): tsin_offset shift by %d on channel %d\n", + __func__, tsoff, + chan->number); + + /* + * offset corrected. re-check remaining + * len for a full TS frame, break and + * skip to fragment handling if < 188. + */ + if (len < 188) + break; } -#ifdef DEBUG_CI_XFER - else - overflow++; -#endif } -#ifdef DEBUG_CI_XFER - else - stripped++; - if (ok % 100 == 0 && overflow) - printk(KERN_WARNING "%s: ok %u overflow %u dropped %u\n", __func__, ok, overflow, stripped); -#endif + tsin_copy_stripped(dev, buf); + buf += 188; len -= 188; } + + /* + * if a fragment is left, copy to temp buffer. The remainder + * will be appended in the next tsin_exchange() iteration. + */ + if (len > 0 && len < 188) + memcpy(&chan->tsin_buffer, buf, len); + return NULL; } |
