Commit 61916562 authored Oct 02, 2014 by Philipp Zabel Committed by Mauro Carvalho Chehab Oct 28, 2014

[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>

parent 5269aed0

drivers/media/platform/coda/coda-bit.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -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 */