From 6374acc5477525f001188c5bd6d79dabb8f9cf3a Mon Sep 17 00:00:00 2001
From: Steffen Pohle <steffen@gulpe.de>
Date: Sun, 14 Apr 2024 01:14:47 +0200
Subject: [PATCH] positioning in videodump playbacks work

---
 ser.h                |  2 +-
 video.cc             |  2 +-
 videodev-dumpfile.cc | 52 ++++++++++++++++++++++++++++++++++++++++++++
 videodev-dumpfile.h  |  1 +
 4 files changed, 55 insertions(+), 2 deletions(-)

diff --git a/ser.h b/ser.h
index 7253c30..8fdb811 100644
--- a/ser.h
+++ b/ser.h
@@ -90,7 +90,7 @@ class SER {
   
   void updateHeaderData(void);
   int64_t differenceLocalUTC(void);
-  
+
  public:
   SER();
   ~SER();
diff --git a/video.cc b/video.cc
index a0f4d11..a65c6b8 100644
--- a/video.cc
+++ b/video.cc
@@ -411,7 +411,7 @@ void cb_video_btnrec (GtkWidget *widget, gpointer data) {
 
 	videodev->SetConfig(device, w, h, format, parameter, cb_thread_video);
 	videodev_thread = g_thread_new(driver.c_str(), videodev_threadprocess_wrapper, NULL);
-	// FIXME: workaround, soltuion should be: create a timer and request all controls
+	// FIXME: workaround, solution should be: create a timer and request all controls
 };
 
 
diff --git a/videodev-dumpfile.cc b/videodev-dumpfile.cc
index 7f0f98a..9676899 100644
--- a/videodev-dumpfile.cc
+++ b/videodev-dumpfile.cc
@@ -98,6 +98,7 @@ int VideoDev_Dumpfile::GetDeviceList(std::list<std::string> *list) {
 int VideoDev_Dumpfile::Open() {
 	if (config.readdumppath == NULL) return VDEV_STATUS_ERROR;
 
+	VideoDevCtrl vctl;
 	uint32_t inbuf[3];
 	int i;
 	struct stat s;
@@ -145,6 +146,14 @@ int VideoDev_Dumpfile::Open() {
 	pixformat = ntohl(inbuf[i++]);
 	conf_format = convert_from_pixelformat (pixformat);
 
+	vidctrls.clear();
+	vctl.name = "FilePosition";
+	vctl.id = 1;
+	vctl.min = 0;
+	vctl.max = 255;
+	vctl.value = 0;
+	vidctrls.push_back(vctl);
+
 	return VDEV_STATUS_OK;
 };
 
@@ -213,9 +222,12 @@ int VideoDev_Dumpfile::CaptureStop() {
  * If something goes wrong return an error code.
  * Return code VDEV_STATUS_AGAIN is not an error. There was no video image ready to read.
  */
+#define SIZE_FRAMEHEADER 8
+#define SIZE_DUMPHEADER  12
 int VideoDev_Dumpfile::Grab(VideoFrameRaw *vf) {
 	struct timeval curtv;
 	unsigned int diff = 0;
+	std::list<VideoDevCtrl>::iterator ctrl;
 
 	if (fd == -1) return VDEV_STATUS_ERROR;
 
@@ -236,6 +248,36 @@ int VideoDev_Dumpfile::Grab(VideoFrameRaw *vf) {
 
 	LockMutex();
 	vf->CopyFrom(pixformat, w, h, inframe_size, inframe);
+	ctrl = vidctrls.begin();
+	if (ctrl->value == 0) {
+		// fixed framesize -> calculate frames
+		switch (pixformat) {
+		case(V4L2_PIX_FMT_RGB24):
+		case(V4L2_PIX_FMT_BGR24):
+			fixedframesize = 3 * w * h;
+			break;
+		case(V4L2_PIX_FMT_RGB32):
+		case(V4L2_PIX_FMT_BGR32):
+			fixedframesize = 4 * w * h;
+			break;
+		case(V4L2_PIX_FMT_SGRBG8):
+			fixedframesize = 2 * w * h;
+			break;
+		case(V4L2_PIX_FMT_SGRBG16):
+			fixedframesize = 4 * w * h;
+			break;
+		default:
+			ctrl->max = 0;
+			ctrl->value = -1;
+			fixedframesize = 0;
+			break;
+		}
+		if (fixedframesize > 0)
+			ctrl->max = (filesize-SIZE_DUMPHEADER) / (fixedframesize + SIZE_FRAMEHEADER);
+	}
+
+	if (ctrl->value != -1) ctrl->value++;
+
 	UnLockMutex();
 
 	//
@@ -313,6 +355,16 @@ int VideoDev_Dumpfile::ReadFrame() {
  * set video control identified by id
  */
 int VideoDev_Dumpfile::SetDevCtrl(unsigned int id, int value) {
+	std::list<VideoDevCtrl>::iterator ctrl;
+	printf ("%s:%d VideoDev_Dumpfile::SetDevCtrl Set Offset to %d   id:%d\n", __FILE__, __LINE__, value, id);
+
+	if (id == 1) {
+		ctrl = vidctrls.begin();
+		if (value != ctrl->value && value < ctrl->max) {
+			ctrl->value = value;
+			lseek (fd, SEEK_SET, SIZE_DUMPHEADER + (value * (SIZE_FRAMEHEADER + fixedframesize)));
+		}
+	}
 	return VDEV_STATUS_OK;
 };
 
diff --git a/videodev-dumpfile.h b/videodev-dumpfile.h
index b099047..fee41b0 100644
--- a/videodev-dumpfile.h
+++ b/videodev-dumpfile.h
@@ -39,6 +39,7 @@ private:
 	uint32_t inframe_nexttime;
 	int inframe_maxsize;
 	int inframe_size;
+	int fixedframesize;
 
 	int Grab(VideoFrameRaw *vf);
 	int Open();