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[media] coda: try to only queue a single JPEG into the bitstream 

With bitstream padding, it is possible to decode a single JPEG in the bitstream
immediately. This allows us to only ever queue a single JPEG into the bitstream
buffer, except to increase payload over 512 bytes or to back out of hold state.
This is a measure to decrease JPEG decoder latency.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Philipp Zabel 2014-10-02 14:08:34 -03:00 committed by Mauro Carvalho Chehab
parent 5269aed0f8
commit 619165628d
1 changed files with 8 additions and 0 deletions
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8
drivers/media/platform/coda/coda-bit.c
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@ -221,6 +221,14 @@ void coda_fill_bitstream(struct coda_ctx *ctx)
u32 start;
while (v4l2_m2m_num_src_bufs_ready(ctx->fh.m2m_ctx) > 0) {
/*
* Only queue a single JPEG into the bitstream buffer, except
* to increase payload over 512 bytes or if in hold state.
*/
if (ctx->codec->src_fourcc == V4L2_PIX_FMT_JPEG &&
(coda_get_bitstream_payload(ctx) >= 512) && !ctx->hold)
break;
src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
/* Buffer start position */