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author | Andy Walls <awalls@radix.net> | 2009-11-08 23:45:24 -0300 |
---|---|---|
committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-12-05 18:41:51 -0200 |
commit | 52fcb3ecc6707f52dfe4297f96b7609d4ba517fb (patch) | |
tree | fe8ecd66c20b10e8b2ba63c667a6afe78c23a2e1 /drivers/media/video/cx18/cx18-vbi.c | |
parent | fa655dda5ce6e5ac4a9b94fd451358edca2ddab8 (diff) | |
download | linux-stable-52fcb3ecc6707f52dfe4297f96b7609d4ba517fb.tar.gz linux-stable-52fcb3ecc6707f52dfe4297f96b7609d4ba517fb.tar.bz2 linux-stable-52fcb3ecc6707f52dfe4297f96b7609d4ba517fb.zip |
V4L/DVB (13429): cx18: Add Memory Descriptor List (MDL) layer to buffer handling
Add a Memory Descriptor List (MDL) layer to buffer handling to implement
scatter-gather I/O. Currently there is still only 1 buffer per MDL.
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/cx18/cx18-vbi.c')
-rw-r--r-- | drivers/media/video/cx18/cx18-vbi.c | 35 |
1 files changed, 30 insertions, 5 deletions
diff --git a/drivers/media/video/cx18/cx18-vbi.c b/drivers/media/video/cx18/cx18-vbi.c index c2aef4add31d..574c1c6974f8 100644 --- a/drivers/media/video/cx18/cx18-vbi.c +++ b/drivers/media/video/cx18/cx18-vbi.c @@ -105,6 +105,7 @@ static void copy_vbi_data(struct cx18 *cx, int lines, u32 pts_stamp) /* Compress raw VBI format, removes leading SAV codes and surplus space after the frame. Returns new compressed size. */ +/* FIXME - this function ignores the input size. */ static u32 compress_raw_buf(struct cx18 *cx, u8 *buf, u32 size, u32 hdr_size) { u32 line_size = vbi_active_samples; @@ -185,8 +186,7 @@ static u32 compress_sliced_buf(struct cx18 *cx, u8 *buf, u32 size, return line; } -void cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf, - int streamtype) +static void _cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf) { /* * The CX23418 provides a 12 byte header in its raw VBI buffers to us: @@ -203,9 +203,6 @@ void cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf, u32 pts; int lines; - if (streamtype != CX18_ENC_STREAM_TYPE_VBI) - return; - /* * The CX23418 sends us data that is 32 bit little-endian swapped, * but we want the raw VBI bytes in the order they were in the raster @@ -250,3 +247,31 @@ void cx18_process_vbi_data(struct cx18 *cx, struct cx18_buffer *buf, copy_vbi_data(cx, lines, pts); cx->vbi.frame++; } + +void cx18_process_vbi_data(struct cx18 *cx, struct cx18_mdl *mdl, + int streamtype) +{ + struct cx18_buffer *buf; + u32 orig_used; + + if (streamtype != CX18_ENC_STREAM_TYPE_VBI) + return; + + /* + * Big assumption here: + * Every buffer hooked to the MDL's buf_list is a complete VBI frame + * that ends at the end of the buffer. + * + * To assume anything else would make the code in this file + * more complex, or require extra memcpy()'s to make the + * buffers satisfy the above assumption. It's just simpler to set + * up the encoder buffer transfers to make the assumption true. + */ + list_for_each_entry(buf, &mdl->buf_list, list) { + orig_used = buf->bytesused; + if (orig_used == 0) + break; + _cx18_process_vbi_data(cx, buf); + mdl->bytesused -= (orig_used - buf->bytesused); + } +} |