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Subject[patch] video-buf.c update
  Hi,

This patch updates the video-buf helper module. It changes the field
handling a bit and adds code do deal better with alternating field
capture (= capture even and odd fields to separate video buffers).

Please apply,

Gerd

--- linux-2.5.54/drivers/media/video/video-buf.c 2003-01-08 10:34:29.000000000 +0100
+++ linux/drivers/media/video/video-buf.c 2003-01-08 10:59:58.000000000 +0100
@@ -339,6 +339,7 @@
struct pci_dev *pci,
spinlock_t *irqlock,
enum v4l2_buf_type type,
+ enum v4l2_field field,
int msize)
{
memset(q,0,sizeof(*q));
@@ -346,6 +347,7 @@
q->irqlock = irqlock;
q->pci = pci;
q->type = type;
+ q->field = field;
q->msize = msize;
q->ops = ops;

@@ -406,6 +408,25 @@

/* --------------------------------------------------------------------- */

+enum v4l2_field
+videobuf_next_field(struct videobuf_queue *q)
+{
+ enum v4l2_field field = q->field;
+
+ BUG_ON(V4L2_FIELD_ANY == field);
+
+ if (V4L2_FIELD_ALTERNATE == field) {
+ if (V4L2_FIELD_TOP == q->last) {
+ field = V4L2_FIELD_TOP;
+ q->last = V4L2_FIELD_TOP;
+ } else {
+ field = V4L2_FIELD_BOTTOM;
+ q->last = V4L2_FIELD_BOTTOM;
+ }
+ }
+ return field;
+}
+
void
videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb,
enum v4l2_buf_type type)
@@ -486,6 +507,7 @@
struct v4l2_buffer *b)
{
struct videobuf_buffer *buf;
+ enum v4l2_field field;
unsigned long flags;
int retval;

@@ -507,7 +529,8 @@
buf->state == STATE_ACTIVE)
goto done;

- retval = q->ops->buf_prepare(file,buf);
+ field = videobuf_next_field(q);
+ retval = q->ops->buf_prepare(file,buf,field);
if (0 != retval)
goto done;

@@ -613,6 +636,8 @@
videobuf_read_zerocopy(struct file *file, struct videobuf_queue *q,
char *data, size_t count, loff_t *ppos)
{
+ enum v4l2_field field;
+ unsigned long flags;
int retval;

/* setup stuff */
@@ -623,12 +648,15 @@

q->read_buf->baddr = (unsigned long)data;
q->read_buf->bsize = count;
- retval = q->ops->buf_prepare(file,q->read_buf);
+ field = videobuf_next_field(q);
+ retval = q->ops->buf_prepare(file,q->read_buf,field);
if (0 != retval)
goto done;

/* start capture & wait */
+ spin_lock_irqsave(q->irqlock,flags);
q->ops->buf_queue(file,q->read_buf);
+ spin_unlock_irqrestore(q->irqlock,flags);
retval = videobuf_waiton(q->read_buf,0,0);
if (0 == retval) {
videobuf_dma_pci_sync(q->pci,&q->read_buf->dma);
@@ -646,6 +674,8 @@
ssize_t videobuf_read_one(struct file *file, struct videobuf_queue *q,
char *data, size_t count, loff_t *ppos)
{
+ enum v4l2_field field;
+ unsigned long flags;
int retval, bytes, size, nbufs;

down(&q->lock);
@@ -668,10 +698,13 @@
q->read_buf = videobuf_alloc(q->msize);
if (NULL == q->read_buf)
goto done;
- retval = q->ops->buf_prepare(file,q->read_buf);
+ field = videobuf_next_field(q);
+ retval = q->ops->buf_prepare(file,q->read_buf,field);
if (0 != retval)
goto done;
+ spin_lock_irqsave(q->irqlock,flags);
q->ops->buf_queue(file,q->read_buf);
+ spin_unlock_irqrestore(q->irqlock,flags);
q->read_off = 0;
}

@@ -705,6 +738,7 @@

int videobuf_read_start(struct file *file, struct videobuf_queue *q)
{
+ enum v4l2_field field;
unsigned long flags;
int count = 0, size = 0;
int err, i;
@@ -720,7 +754,8 @@
if (err)
return err;
for (i = 0; i < count; i++) {
- err = q->ops->buf_prepare(file,q->bufs[i]);
+ field = videobuf_next_field(q);
+ err = q->ops->buf_prepare(file,q->bufs[i],field);
if (err)
return err;
list_add_tail(&q->bufs[i]->stream, &q->stream);
@@ -793,6 +828,7 @@
fc = (unsigned int*)q->read_buf->dma.vmalloc;
fc += (q->read_buf->size>>2) -1;
*fc = q->read_buf->field_count >> 1;
+ dprintk(1,"vbihack: %d\n",*fc);
}

/* copy stuff */
--- linux-2.5.54/drivers/media/video/video-buf.h 2003-01-08 10:34:32.000000000 +0100
+++ linux/drivers/media/video/video-buf.h 2003-01-08 10:59:58.000000000 +0100
@@ -154,7 +154,8 @@

struct videobuf_queue_ops {
int (*buf_setup)(struct file *file, int *count, int *size);
- int (*buf_prepare)(struct file *file,struct videobuf_buffer *vb);
+ int (*buf_prepare)(struct file *file,struct videobuf_buffer *vb,
+ enum v4l2_field field);
void (*buf_queue)(struct file *file,struct videobuf_buffer *vb);
void (*buf_release)(struct file *file,struct videobuf_buffer *vb);
};
@@ -166,6 +167,8 @@

enum v4l2_buf_type type;
int msize;
+ enum v4l2_field field;
+ enum v4l2_field last; /* for field=V4L2_FIELD_ALTERNATE */
struct videobuf_buffer *bufs[VIDEO_MAX_FRAME];
struct videobuf_queue_ops *ops;

@@ -186,7 +189,8 @@
void videobuf_queue_init(struct videobuf_queue *q,
struct videobuf_queue_ops *ops,
struct pci_dev *pci, spinlock_t *irqlock,
- enum v4l2_buf_type type, int msize);
+ enum v4l2_buf_type type,
+ enum v4l2_field field, int msize);
int videobuf_queue_is_busy(struct videobuf_queue *q);
void videobuf_queue_cancel(struct file *file, struct videobuf_queue *q);

--
Weil die späten Diskussionen nicht mal mehr den Rotwein lohnen.
-- Wacholder in "Melanie"
-
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