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authorAndy Walls <awalls@radix.net>2009-11-09 23:55:30 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-12-05 18:41:52 -0200
commit22dce188ef3e1e058ceabe3b3072640d7568f764 (patch)
tree6a5ee29e5b7cdf9125bea7456c8de75ab0861b92
parent52fcb3ecc6707f52dfe4297f96b7609d4ba517fb (diff)
V4L/DVB (13430): cx18: Fix YUV capture so that encoder passes a single frame per transfer
Fix YUV capture such that the encoder will pass one frame per transfer. This will allow the application to maintain frame alignment when a transfer from the encoder is missed due to high system latency in service the CX23418 IRQ. Also force YUV buffer sizes to be specified in multiples of 33.75 kB, the smalled amount of buffer sizes need to store a complete set of HM12 4:2:0 macroblocks specifying 32 lines of the frame. A full 60Hz/525 line screen requires 15 * 33.75 kB per frame and a full 50Hz/625 line screen requires 18 * 33.75 kB per frame so the default buffer size is 3 * 33.75 kB, requiring exactly 5 or 6 buffers per MDL respectively. The bytes needed per frame and hence MDL need not be the bytes in an integer number of buffers. However, if frame artifacts are seen with scaled screen sizes, the YUV buffer size can be set 34 kB (33.75 kB) to get rid of the artifacts at the cost of more copies between the kernel and userspace. Signed-off-by: Andy Walls <awalls@radix.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
-rw-r--r--drivers/media/video/cx18/cx18-driver.c49
-rw-r--r--drivers/media/video/cx18/cx18-driver.h7
-rw-r--r--drivers/media/video/cx18/cx18-dvb.c5
-rw-r--r--drivers/media/video/cx18/cx18-queue.c6
-rw-r--r--drivers/media/video/cx18/cx18-streams.c26
5 files changed, 71 insertions, 22 deletions
diff --git a/drivers/media/video/cx18/cx18-driver.c b/drivers/media/video/cx18/cx18-driver.c
index ba4c3ceffbb..87a735f1ee9 100644
--- a/drivers/media/video/cx18/cx18-driver.c
+++ b/drivers/media/video/cx18/cx18-driver.c
@@ -211,7 +211,9 @@ MODULE_PARM_DESC(enc_yuv_buffers,
"\t\t\tDefault: " __stringify(CX18_DEFAULT_ENC_YUV_BUFFERS));
MODULE_PARM_DESC(enc_yuv_bufsize,
"Size of an encoder YUV buffer (kB)\n"
- "\t\t\tDefault: " __stringify(CX18_DEFAULT_ENC_YUV_BUFSIZE));
+ "\t\t\tAllowed values are multiples of 33.75 kB rounded up\n"
+ "\t\t\t(multiples of size required for 32 screen lines)\n"
+ "\t\t\tDefault: 102");
MODULE_PARM_DESC(enc_yuv_bufs,
"Number of encoder YUV buffers\n"
"\t\t\tDefault is computed from other enc_yuv_* parameters");
@@ -499,10 +501,27 @@ static void cx18_process_options(struct cx18 *cx)
continue;
}
/*
+ * YUV is a special case where the stream_buf_size needs to be
+ * an integral multiple of 33.75 kB (storage for 32 screens
+ * lines to maintain alignment in case of lost buffers
+ */
+ if (i == CX18_ENC_STREAM_TYPE_YUV) {
+ cx->stream_buf_size[i] *= 1024;
+ cx->stream_buf_size[i] -=
+ (cx->stream_buf_size[i] % CX18_UNIT_ENC_YUV_BUFSIZE);
+
+ if (cx->stream_buf_size[i] < CX18_UNIT_ENC_YUV_BUFSIZE)
+ cx->stream_buf_size[i] =
+ CX18_UNIT_ENC_YUV_BUFSIZE;
+ }
+ /*
+ * YUV is a special case where the stream_buf_size is
+ * now in bytes.
* VBI is a special case where the stream_buf_size is fixed
* and already in bytes
*/
- if (i == CX18_ENC_STREAM_TYPE_VBI) {
+ if (i == CX18_ENC_STREAM_TYPE_VBI ||
+ i == CX18_ENC_STREAM_TYPE_YUV) {
if (cx->stream_buffers[i] < 0) {
cx->stream_buffers[i] =
cx->options.megabytes[i] * 1024 * 1024
@@ -513,18 +532,24 @@ static void cx18_process_options(struct cx18 *cx)
cx->stream_buffers[i]
* cx->stream_buf_size[i]/(1024 * 1024);
}
- continue;
- }
- /* All other streams have stream_buf_size in kB at this point */
- if (cx->stream_buffers[i] < 0) {
- cx->stream_buffers[i] = cx->options.megabytes[i] * 1024
- / cx->stream_buf_size[i];
} else {
- /* N.B. This might round down to 0 */
- cx->options.megabytes[i] =
- cx->stream_buffers[i] * cx->stream_buf_size[i] / 1024;
+ /* All other streams have stream_buf_size in kB here */
+ if (cx->stream_buffers[i] < 0) {
+ cx->stream_buffers[i] =
+ cx->options.megabytes[i] * 1024
+ / cx->stream_buf_size[i];
+ } else {
+ /* N.B. This might round down to 0 */
+ cx->options.megabytes[i] =
+ cx->stream_buffers[i]
+ * cx->stream_buf_size[i] / 1024;
+ }
+ /* convert from kB to bytes */
+ cx->stream_buf_size[i] *= 1024;
}
- cx->stream_buf_size[i] *= 1024; /* convert from kB to bytes */
+ CX18_DEBUG_INFO("Stream type %d options: %d MB, %d buffers, "
+ "%d bytes\n", i, cx->options.megabytes[i],
+ cx->stream_buffers[i], cx->stream_buf_size[i]);
}
cx->options.cardtype = cardtype[cx->instance];
diff --git a/drivers/media/video/cx18/cx18-driver.h b/drivers/media/video/cx18/cx18-driver.h
index bed8bcc6541..5c78b014dbc 100644
--- a/drivers/media/video/cx18/cx18-driver.h
+++ b/drivers/media/video/cx18/cx18-driver.h
@@ -120,11 +120,16 @@
/* Maximum firmware DMA buffers per stream */
#define CX18_MAX_FW_MDLS_PER_STREAM 63
+/* YUV buffer sizes in bytes to ensure integer # of frames per buffer */
+#define CX18_UNIT_ENC_YUV_BUFSIZE (720 * 32 * 3 / 2) /* bytes */
+#define CX18_625_LINE_ENC_YUV_BUFSIZE (CX18_UNIT_ENC_YUV_BUFSIZE * 576/32)
+#define CX18_525_LINE_ENC_YUV_BUFSIZE (CX18_UNIT_ENC_YUV_BUFSIZE * 480/32)
+
/* DMA buffer, default size in kB allocated */
#define CX18_DEFAULT_ENC_TS_BUFSIZE 32
#define CX18_DEFAULT_ENC_MPG_BUFSIZE 32
#define CX18_DEFAULT_ENC_IDX_BUFSIZE 32
-#define CX18_DEFAULT_ENC_YUV_BUFSIZE 128
+#define CX18_DEFAULT_ENC_YUV_BUFSIZE (CX18_UNIT_ENC_YUV_BUFSIZE * 3 / 1024 + 1)
/* Default VBI bufsize based on standards supported by card tuner for now */
#define CX18_DEFAULT_ENC_PCM_BUFSIZE 4
diff --git a/drivers/media/video/cx18/cx18-dvb.c b/drivers/media/video/cx18/cx18-dvb.c
index 54a6fd3f7af..71ad2d1b4c2 100644
--- a/drivers/media/video/cx18/cx18-dvb.c
+++ b/drivers/media/video/cx18/cx18-dvb.c
@@ -362,9 +362,10 @@ int cx18_dvb_register(struct cx18_stream *stream)
dvb_net_init(dvb_adapter, &dvb->dvbnet, dmx);
CX18_INFO("DVB Frontend registered\n");
- CX18_INFO("Registered DVB adapter%d for %s (%d x %d kB)\n",
+ CX18_INFO("Registered DVB adapter%d for %s (%d x %d.%02d kB)\n",
stream->dvb.dvb_adapter.num, stream->name,
- stream->buffers, stream->buf_size/1024);
+ stream->buffers, stream->buf_size/1024,
+ (stream->buf_size * 100 / 1024) % 100);
mutex_init(&dvb->feedlock);
dvb->enabled = 1;
diff --git a/drivers/media/video/cx18/cx18-queue.c b/drivers/media/video/cx18/cx18-queue.c
index c1a49ecf9d9..98cbf001f8d 100644
--- a/drivers/media/video/cx18/cx18-queue.c
+++ b/drivers/media/video/cx18/cx18-queue.c
@@ -348,9 +348,11 @@ int cx18_stream_alloc(struct cx18_stream *s)
if (s->buffers == 0)
return 0;
- CX18_DEBUG_INFO("Allocate %s stream: %d x %d buffers (%dkB total)\n",
+ CX18_DEBUG_INFO("Allocate %s stream: %d x %d buffers "
+ "(%d.%02d kB total)\n",
s->name, s->buffers, s->buf_size,
- s->buffers * s->buf_size / 1024);
+ s->buffers * s->buf_size / 1024,
+ (s->buffers * s->buf_size * 100 / 1024) % 100);
if (((char __iomem *)&cx->scb->cpu_mdl[cx->free_mdl_idx + s->buffers] -
(char __iomem *)cx->scb) > SCB_RESERVED_SIZE) {
diff --git a/drivers/media/video/cx18/cx18-streams.c b/drivers/media/video/cx18/cx18-streams.c
index 9f8adda6f26..7755937fc52 100644
--- a/drivers/media/video/cx18/cx18-streams.c
+++ b/drivers/media/video/cx18/cx18-streams.c
@@ -262,9 +262,11 @@ static int cx18_reg_dev(struct cx18 *cx, int type)
switch (vfl_type) {
case VFL_TYPE_GRABBER:
- CX18_INFO("Registered device video%d for %s (%d x %d kB)\n",
+ CX18_INFO("Registered device video%d for %s "
+ "(%d x %d.%02d kB)\n",
num, s->name, cx->stream_buffers[type],
- cx->stream_buf_size[type]/1024);
+ cx->stream_buf_size[type] / 1024,
+ (cx->stream_buf_size[type] * 100 / 1024) % 100);
break;
case VFL_TYPE_RADIO:
@@ -501,9 +503,23 @@ static void cx18_stream_configure_mdls(struct cx18_stream *s)
{
cx18_unload_queues(s);
- /* For now */
- s->bufs_per_mdl = 1;
- s->mdl_size = s->buf_size * s->bufs_per_mdl;
+ switch (s->type) {
+ case CX18_ENC_STREAM_TYPE_YUV:
+ /*
+ * Height should be a multiple of 32 lines.
+ * Set the MDL size to the exact size needed for one frame.
+ * Use enough buffers per MDL to cover the MDL size
+ */
+ s->mdl_size = 720 * s->cx->params.height * 3 / 2;
+ s->bufs_per_mdl = s->mdl_size / s->buf_size;
+ if (s->mdl_size % s->buf_size)
+ s->bufs_per_mdl++;
+ break;
+ default:
+ s->bufs_per_mdl = 1;
+ s->mdl_size = s->buf_size * s->bufs_per_mdl;
+ break;
+ }
cx18_load_queues(s);
}