From 619165628d8f0e296c66a2f37bcea50769b7873d Mon Sep 17 00:00:00 2001 From: Philipp Zabel Date: Thu, 2 Oct 2014 14:08:34 -0300 Subject: [PATCH] [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 Signed-off-by: Kamil Debski Signed-off-by: Mauro Carvalho Chehab --- drivers/media/platform/coda/coda-bit.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/media/platform/coda/coda-bit.c b/drivers/media/platform/coda/coda-bit.c index 27e0764e3ac5..2a6810e47a5c 100644 --- a/drivers/media/platform/coda/coda-bit.c +++ b/drivers/media/platform/coda/coda-bit.c @@ -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 */ -- 2.39.5