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V4L/DVB (6712): ivtv: ivtv yuv stream handling change

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Currently the yuv output stream buffer is divided into blocks whose size
depend on the broadcast standard selected during the driver init phase.
However, the standard can be changed after the init phase. This effectively
breaks the yuv output stream handler, since it relies on the different yuv
planes being block aligned.

This patch changes the setup, so that the block size is always the same. The
decoder dma function has been modified to cope with the fact that the second
yuv plane may no longer be block aligned. The start of the yuv frame must
still be at the beginning of a block, so the stream write function has also
been modified to ensure this is always true.

Also, the stream write function will now initiate a yuv dma transfer as soon
as a full frame is ready. It will not wait until the current write request
has completed, or the stream buffer becomes full.

Signed-off-by: Ian Armstrong <ian@iarmst.demon.co.uk>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Ian Armstrong 2007-10-16 03:21:46 -03:00 committed by Mauro Carvalho Chehab
parent 9de982d311
commit c240ad00af
4 changed files with 50 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/media/video/ivtv/ivtv-driver.c
View File

@ -970,7 +970,6 @@ static int __devinit ivtv_probe(struct pci_dev *dev,
const struct pci_device_id *pci_id)
{
int retval = 0;
int yuv_buf_size;
int vbi_buf_size;
struct ivtv *itv;
@ -1122,11 +1121,8 @@ static int __devinit ivtv_probe(struct pci_dev *dev,
itv->stream_buf_size[IVTV_ENC_STREAM_TYPE_MPG] = 0x08000;
itv->stream_buf_size[IVTV_ENC_STREAM_TYPE_PCM] = 0x01200;
itv->stream_buf_size[IVTV_DEC_STREAM_TYPE_MPG] = 0x10000;
/* 0x15180 == 720 * 480 / 4, 0x19500 == 720 * 576 / 4 */
yuv_buf_size = itv->is_60hz ? 0x15180 : 0x19500;
itv->stream_buf_size[IVTV_DEC_STREAM_TYPE_YUV] = yuv_buf_size / 2;
itv->stream_buf_size[IVTV_ENC_STREAM_TYPE_YUV] = yuv_buf_size / 8;
itv->stream_buf_size[IVTV_DEC_STREAM_TYPE_YUV] = 0x10000;
itv->stream_buf_size[IVTV_ENC_STREAM_TYPE_YUV] = 0x08000;
/* Setup VBI Raw Size. Should be big enough to hold PAL.
It is possible to switch between PAL and NTSC, so we need to

2
drivers/media/video/ivtv/ivtv-driver.h
View File

@ -485,6 +485,8 @@ struct yuv_playback_info
void *blanking_ptr;
dma_addr_t blanking_dmaptr;
int stream_size;
};
#define IVTV_VBI_FRAMES 32

31
drivers/media/video/ivtv/ivtv-fileops.c
View File

@ -542,6 +542,7 @@ ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t c
struct ivtv_open_id *id = filp->private_data;
struct ivtv *itv = id->itv;
struct ivtv_stream *s = &itv->streams[id->type];
struct yuv_playback_info *yi = &itv->yuv_info;
struct ivtv_buffer *buf;
struct ivtv_queue q;
int bytes_written = 0;
@ -604,9 +605,16 @@ retry:
/* copy user data into buffers */
while ((buf = ivtv_dequeue(s, &q))) {
/* Make sure we really got all the user data */
rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
/* yuv is a pain. Don't copy more data than needed for a single
frame, otherwise we lose sync with the incoming stream */
if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
yi->stream_size + count > itv->dma_data_req_size)
rc = ivtv_buf_copy_from_user(s, buf, user_buf,
itv->dma_data_req_size - yi->stream_size);
else
rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
/* Make sure we really got all the user data */
if (rc < 0) {
ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
return rc;
@ -615,6 +623,16 @@ retry:
count -= rc;
bytes_written += rc;
if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
yi->stream_size += rc;
/* If we have a complete yuv frame, break loop now */
if (yi->stream_size == itv->dma_data_req_size) {
ivtv_enqueue(s, buf, &s->q_full);
yi->stream_size = 0;
break;
}
}
if (buf->bytesused != s->buf_size) {
/* incomplete, leave in q_io for next time */
ivtv_enqueue(s, buf, &s->q_io);
@ -922,10 +940,15 @@ static int ivtv_serialized_open(struct ivtv_stream *s, struct file *filp)
}
/* YUV or MPG Decoding Mode? */
if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
if (s->type == IVTV_DEC_STREAM_TYPE_MPG) {
clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
else if (s->type == IVTV_DEC_STREAM_TYPE_YUV)
} else if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
/* For yuv, we need to know the dma size before we start */
itv->dma_data_req_size =
itv->params.width * itv->params.height * 3 / 2;
itv->yuv_info.stream_size = 0;
}
return 0;
}

25
drivers/media/video/ivtv/ivtv-irq.c
View File

@ -313,15 +313,28 @@ void ivtv_dma_stream_dec_prepare(struct ivtv_stream *s, u32 offset, int lock)
IVTV_DEBUG_HI_DMA("DEC PREPARE DMA %s: %08x %08x\n", s->name, s->q_predma.bytesused, offset);
list_for_each_entry(buf, &s->q_predma.list, list) {
/* YUV UV Offset from Y Buffer */
if (s->type == IVTV_DEC_STREAM_TYPE_YUV && !y_done && bytes_written >= y_size) {
if (s->type == IVTV_DEC_STREAM_TYPE_YUV && !y_done &&
(bytes_written + buf->bytesused) >= y_size) {
s->sg_pending[idx].src = buf->dma_handle;
s->sg_pending[idx].dst = offset;
s->sg_pending[idx].size = y_size - bytes_written;
offset = uv_offset;
if (s->sg_pending[idx].size != buf->bytesused) {
idx++;
s->sg_pending[idx].src =
buf->dma_handle + s->sg_pending[idx - 1].size;
s->sg_pending[idx].dst = offset;
s->sg_pending[idx].size =
buf->bytesused - s->sg_pending[idx - 1].size;
offset += s->sg_pending[idx].size;
}
y_done = 1;
} else {
s->sg_pending[idx].src = buf->dma_handle;
s->sg_pending[idx].dst = offset;
s->sg_pending[idx].size = buf->bytesused;
offset += buf->bytesused;
}
s->sg_pending[idx].src = buf->dma_handle;
s->sg_pending[idx].dst = offset;
s->sg_pending[idx].size = buf->bytesused;
offset += buf->bytesused;
bytes_written += buf->bytesused;
/* Sync SG buffers */