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87 lines
3.4 KiB
87 lines
3.4 KiB
From 19202b54698b343a0207d7e213448e32b8e58fc3 Mon Sep 17 00:00:00 2001
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From: Olliver Schinagl <o.schinagl@ultimaker.com>
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Date: Wed, 29 Oct 2014 09:34:41 +0100
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Subject: [PATCH 1/7] Buffer the bytesused variable from struct v4l2_buffer
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Starting with kernel versions 3.16, (DE)Queing of buffers has been fixed
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after it was leaking data for ages. in the struct v4l2_buffer is the
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bytesused element which indicates the size of the buffer. This however
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gets cleared whenever the buffer gets requeued and is thus no longer
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valid.
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This patch copies the bytesused variable so it is available until the
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next frame captured again.
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Signed-off-by: Olliver Schinagl <o.schinagl@ultimaker.com>
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---
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plugins/input_uvc/input_uvc.c | 6 +++---
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plugins/input_uvc/v4l2uvc.c | 2 ++
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plugins/input_uvc/v4l2uvc.h | 1 +
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3 files changed, 6 insertions(+), 3 deletions(-)
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diff --git a/plugins/input_uvc/input_uvc.c b/plugins/input_uvc/input_uvc.c
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index e6c74fd..64f66cb 100644
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--- a/plugins/input_uvc/input_uvc.c
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+++ b/plugins/input_uvc/input_uvc.c
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@@ -482,7 +482,7 @@ void *cam_thread(void *arg)
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exit(EXIT_FAILURE);
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}
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- //DBG("received frame of size: %d from plugin: %d\n", pcontext->videoIn->buf.bytesused, pcontext->id);
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+ //DBG("received frame of size: %d from plugin: %d\n", pcontext->videoIn->tmpbytesused, pcontext->id);
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/*
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* Workaround for broken, corrupted frames:
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@@ -491,7 +491,7 @@ void *cam_thread(void *arg)
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* For example a VGA (640x480) webcam picture is normally >= 8kByte large,
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* corrupted frames are smaller.
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*/
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- if(pcontext->videoIn->buf.bytesused < minimum_size) {
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+ if(pcontext->videoIn->tmpbytesused < minimum_size) {
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DBG("dropping too small frame, assuming it as broken\n");
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continue;
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}
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@@ -529,7 +529,7 @@ void *cam_thread(void *arg)
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} else {
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#endif
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//DBG("copying frame from input: %d\n", (int)pcontext->id);
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- pglobal->in[pcontext->id].size = memcpy_picture(pglobal->in[pcontext->id].buf, pcontext->videoIn->tmpbuffer, pcontext->videoIn->buf.bytesused);
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+ pglobal->in[pcontext->id].size = memcpy_picture(pglobal->in[pcontext->id].buf, pcontext->videoIn->tmpbuffer, pcontext->videoIn->tmpbytesused);
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#ifndef NO_LIBJPEG
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}
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#endif
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diff --git a/plugins/input_uvc/v4l2uvc.c b/plugins/input_uvc/v4l2uvc.c
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index c5a5aa4..d11510c 100644
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--- a/plugins/input_uvc/v4l2uvc.c
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+++ b/plugins/input_uvc/v4l2uvc.c
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@@ -532,6 +532,7 @@ int uvcGrab(struct vdIn *vd)
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*/
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memcpy(vd->tmpbuffer, vd->mem[vd->buf.index], vd->buf.bytesused);
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+ vd->tmpbytesused = vd->buf.bytesused;
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if(debug)
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fprintf(stderr, "bytes in used %d \n", vd->buf.bytesused);
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@@ -570,6 +571,7 @@ int close_v4l2(struct vdIn *vd)
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if(vd->tmpbuffer)
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free(vd->tmpbuffer);
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vd->tmpbuffer = NULL;
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+ vd->tmpbytesused = 0;
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free(vd->framebuffer);
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vd->framebuffer = NULL;
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free(vd->videodevice);
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diff --git a/plugins/input_uvc/v4l2uvc.h b/plugins/input_uvc/v4l2uvc.h
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index 022c57e..2c7c8ba 100644
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--- a/plugins/input_uvc/v4l2uvc.h
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+++ b/plugins/input_uvc/v4l2uvc.h
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@@ -83,6 +83,7 @@ struct vdIn {
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struct v4l2_requestbuffers rb;
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void *mem[NB_BUFFER];
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unsigned char *tmpbuffer;
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+ int tmpbytesused;
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unsigned char *framebuffer;
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streaming_state streamingState;
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int grabmethod;
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--
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1.9.1
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