This is an example application for testing mem-to-mem framework using
mem2mem-testdev device.
It is intended to be executed multiple times in parallel to test multi-instance
operation and scheduling. Each process can be configured differently using
command-line arguments.
The application opens video test device and framebuffer, sets up params,
queues src/dst buffers and displays processed results on the framebuffer.
Configurable parameters: starting point on the framebuffer, width/height of
buffers, transaction length (in buffers), transaction duration, total number
of frames to be processed.
Tested on a 800x480 framebuffer with the following script:
#!/bin/bash
for i in {0..3}
do
((x=$i * 100))
./process-vmalloc 0 $(($i + 1)) $((2000 - $i * 500)) $((($i+1) * 4)) \
$x $x 100 100 &
done
Signed-off-by: Pawel Osciak <p.osciak@xxxxxxxxxxx>
Reviewed-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
--- /dev/null 2009-11-17 07:51:25.574927259 +0100
+++ process-vmalloc.c 2009-11-26 11:00:26.000000000 +0100
@@ -0,0 +1,420 @@
+/**
+ * process-vmalloc.c
+ * Capture+output (process) V4L2 device tester.
+ *
+ * Pawel Osciak, p.osciak@xxxxxxxxxxx
+ * 2009, Samsung Electronics Co., Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <time.h>
+#include <errno.h>
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <stdint.h>
+
+#include <linux/fb.h>
+#include <linux/videodev2.h>
+
+#include <sys/mman.h>
+
+#define V4L2_CID_TRANS_TIME_MSEC (V4L2_CID_PRIVATE_BASE)
+#define V4L2_CID_TRANS_NUM_BUFS (V4L2_CID_PRIVATE_BASE + 1)
+
+#define VIDEO_DEV_NAME "/dev/video0"
+#define FB_DEV_NAME "/dev/fb0"
+#define NUM_BUFS 4
+#define NUM_FRAMES 16
+
+#define perror_exit(cond, func)\
+ if (cond) {\
+ fprintf(stderr, "%s:%d: ", __func__, __LINE__);\
+ perror(func);\
+ exit(EXIT_FAILURE);\
+ }
+
+#define error_exit(cond, func)\
+ if (cond) {\
+ fprintf(stderr, "%s:%d: failed\n", func, __LINE__);\
+ exit(EXIT_FAILURE);\
+ }
+
+#define perror_ret(cond, func)\
+ if (cond) {\
+ fprintf(stderr, "%s:%d: ", __func__, __LINE__);\
+ perror(func);\
+ return ret;\
+ }
+
+#define memzero(x)\
+ memset(&(x), 0, sizeof (x));
+
+#define PROCESS_DEBUG 1
+#ifdef PROCESS_DEBUG
+#define debug(msg, ...)\
+ fprintf(stderr, "%s: " msg, __func__, ##__VA_ARGS__);
+#else
+#define debug(msg, ...)
+#endif
+
+static int vid_fd, fb_fd;
+static void *fb_addr;
+static char *p_src_buf[NUM_BUFS], *p_dst_buf[NUM_BUFS];
+static size_t src_buf_size[NUM_BUFS], dst_buf_size[NUM_BUFS];
+static uint32_t num_src_bufs = 0, num_dst_bufs = 0;
+
+/* Command-line params */
+int initial_delay = 0;
+int fb_x, fb_y, width, height;
+int translen = 1;
+/* For displaying multi-buffer transaction simulations, indicates current
+ * buffer in an ongoing transaction */
+int curr_buf = 0;
+int transtime = 1000;
+int num_frames = 0;
+off_t fb_off, fb_line_w, fb_buf_w;
+struct fb_var_screeninfo fbinfo;
+
+static void init_video_dev(void)
+{
+ int ret;
+ struct v4l2_capability cap;
+ struct v4l2_format fmt;
+ struct v4l2_control ctrl;
+
+ vid_fd = open(VIDEO_DEV_NAME, O_RDWR | O_NONBLOCK, 0);
+ perror_exit(vid_fd < 0, "open");
+
+ ctrl.id = V4L2_CID_TRANS_TIME_MSEC;
+ ctrl.value = transtime;
+ ret = ioctl(vid_fd, VIDIOC_S_CTRL, &ctrl);
+ perror_exit(ret != 0, "ioctl");
+
+ ctrl.id = V4L2_CID_TRANS_NUM_BUFS;
+ ctrl.value = translen;
+ ret = ioctl(vid_fd, VIDIOC_S_CTRL, &ctrl);
+ perror_exit(ret != 0, "ioctl");
+
+ ret = ioctl(vid_fd, VIDIOC_QUERYCAP, &cap);
+ perror_exit(ret != 0, "ioctl");
+
+ if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
+ fprintf(stderr, "Device does not support capture\n");
+ exit(EXIT_FAILURE);
+ }
+ if (!(cap.capabilities & V4L2_CAP_VIDEO_OUTPUT)) {
+ fprintf(stderr, "Device does not support output\n");
+ exit(EXIT_FAILURE);
+ }
+
+ /* Set format for capture */
+ fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ fmt.fmt.pix.width = width;
+ fmt.fmt.pix.height = height;
+ fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB565X;
+ fmt.fmt.pix.field = V4L2_FIELD_ANY;
+
+ ret = ioctl(vid_fd, VIDIOC_S_FMT, &fmt);
+ perror_exit(ret != 0, "ioctl");
+
+ /* The same format for output */
+ fmt.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+ fmt.fmt.pix.width = width;
+ fmt.fmt.pix.height = height;
+ fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB565X;
+ fmt.fmt.pix.field = V4L2_FIELD_ANY;
+
+ ret = ioctl(vid_fd, VIDIOC_S_FMT, &fmt);
+ perror_exit(ret != 0, "ioctl");
+}
+
+static void gen_src_buf(void *p, size_t size)
+{
+ uint8_t val;
+
+ val = rand() % 256;
+ memset(p, val, size);
+}
+
+static void gen_dst_buf(void *p, size_t size)
+{
+ /* White */
+ memset(p, 255, 0);
+}
+
+static int read_frame(int last)
+{
+ struct v4l2_buffer buf;
+ int ret;
+ int j;
+ char * p_fb = fb_addr + fb_off;
+
+ memzero(buf);
+
+ buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+ buf.memory = V4L2_MEMORY_MMAP;
+
+ ret = ioctl(vid_fd, VIDIOC_DQBUF, &buf);
+ debug("Dequeued source buffer, index: %d\n", buf.index);
+ if (ret) {
+ switch (errno) {
+ case EAGAIN:
+ debug("Got EAGAIN\n");
+ return 0;
+
+ case EIO:
+ debug("Got EIO\n");
+ return 0;
+
+ default:
+ perror("ioctl");
+ return 0;
+ }
+ }
+
+ /* Verify we've got a correct buffer */
+ assert(buf.index < num_src_bufs);
+
+ /* Enqueue back the buffer (note that the index is preserved) */
+ if (!last) {
+ gen_src_buf(p_src_buf[buf.index], src_buf_size[buf.index]);
+ buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+ buf.memory = V4L2_MEMORY_MMAP;
+ ret = ioctl(vid_fd, VIDIOC_QBUF, &buf);
+ perror_ret(ret != 0, "ioctl");
+ }
+
+
+ buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+
+ debug("Dequeuing destination buffer\n");
+ ret = ioctl(vid_fd, VIDIOC_DQBUF, &buf);
+ if (ret) {
+ switch (errno) {
+ case EAGAIN:
+ debug("Got EAGAIN\n");
+ return 0;
+
+ case EIO:
+ debug("Got EIO\n");
+ return 0;
+
+ default:
+ perror("ioctl");
+ return 1;
+ }
+ }
+ debug("Dequeued dst buffer, index: %d\n", buf.index);
+ /* Verify we've got a correct buffer */
+ assert(buf.index < num_dst_bufs);
+
+ debug("Current buffer in the transaction: %d\n", curr_buf);
+ p_fb += curr_buf * (height / translen) * fb_line_w;
+ ++curr_buf;
+ if (curr_buf >= translen)
+ curr_buf = 0;
+
+ /* Display results */
+ for (j = 0; j < height / translen; ++j) {
+ memcpy(p_fb, (void *)p_dst_buf[buf.index], fb_buf_w);
+ p_fb += fb_line_w;
+ }
+
+ /* Enqueue back the buffer */
+ if (!last) {
+ gen_dst_buf(p_dst_buf[buf.index], dst_buf_size[buf.index]);
+ ret = ioctl(vid_fd, VIDIOC_QBUF, &buf);
+ perror_ret(ret != 0, "ioctl");
+ debug("Enqueued back dst buffer\n");
+ }
+
+ return 0;
+}
+
+void init_usage(int argc, char *argv[])
+{
+ if (argc != 9) {
+ printf("Usage: %s initial_delay bufs_per_transaction "
+ "trans_length_msec num_frames fb_offset_x fb_offset_y "
+ "width height\n", argv[0]);
+ exit(EXIT_FAILURE);
+ }
+
+ initial_delay = atoi(argv[1]);
+ translen = atoi(argv[2]);
+ transtime = atoi(argv[3]);
+ num_frames = atoi(argv[4]);
+ fb_x = atoi(argv[5]);
+ fb_y = atoi(argv[6]);
+ width = atoi(argv[7]);
+ height = atoi(argv[8]);
+ debug("NEW PROCESS: fb_x: %d, fb_y: %d, width: %d, height: %d, "
+ "translen: %d, transtime: %d, num_frames: %d\n",
+ fb_x, fb_y, width, height, translen, transtime, num_frames);
+}
+
+void init_fb(void)
+{
+ int ret;
+ size_t map_size;
+
+ fb_fd = open(FB_DEV_NAME, O_RDWR, 0);
+ perror_exit(fb_fd < 0, "open");
+
+ ret = ioctl(fb_fd, FBIOGET_VSCREENINFO, &fbinfo);
+ perror_exit(ret != 0, "ioctl");
+ debug("fbinfo: xres: %d, xres_virt: %d, yres: %d, yres_virt: %d\n",
+ fbinfo.xres, fbinfo.xres_virtual,
+ fbinfo.yres, fbinfo.yres_virtual);
+
+ fb_line_w= fbinfo.xres_virtual * (fbinfo.bits_per_pixel >> 3);
+ fb_off = fb_y * fb_line_w + fb_x * (fbinfo.bits_per_pixel >> 3);
+ fb_buf_w = width * (fbinfo.bits_per_pixel >> 3);
+ map_size = fb_line_w * fbinfo.yres_virtual;
+
+ fb_addr = mmap(0, map_size, PROT_WRITE | PROT_READ,
+ MAP_SHARED, fb_fd, 0);
+ perror_exit(fb_addr == MAP_FAILED, "mmap");
+}
+
+int main(int argc, char *argv[])
+{
+ int ret = 0;
+ int i;
+ struct v4l2_buffer buf;
+ struct v4l2_requestbuffers reqbuf;
+ enum v4l2_buf_type type;
+ int last = 0;
+
+ init_usage(argc, argv);
+ init_fb();
+
+ srand(time(NULL) ^ getpid());
+ sleep(initial_delay);
+
+ init_video_dev();
+
+ memzero(reqbuf);
+ reqbuf.count = NUM_BUFS;
+ reqbuf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+ type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+ reqbuf.memory = V4L2_MEMORY_MMAP;
+ ret = ioctl(vid_fd, VIDIOC_REQBUFS, &reqbuf);
+ perror_exit(ret != 0, "ioctl");
+ num_src_bufs = reqbuf.count;
+ debug("Got %d src buffers\n", num_src_bufs);
+
+ reqbuf.count = NUM_BUFS;
+ reqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ ret = ioctl(vid_fd, VIDIOC_REQBUFS, &reqbuf);
+ perror_exit(ret != 0, "ioctl");
+ num_dst_bufs = reqbuf.count;
+ debug("Got %d dst buffers\n", num_dst_bufs);
+
+ for (i = 0; i < num_src_bufs; ++i) {
+ buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+ buf.memory = V4L2_MEMORY_MMAP;
+ buf.index = i;
+
+ ret = ioctl(vid_fd, VIDIOC_QUERYBUF, &buf);
+ perror_exit(ret != 0, "ioctl");
+ debug("QUERYBUF returned offset: %x\n", buf.m.offset);
+
+ src_buf_size[i] = buf.length;
+ p_src_buf[i] = mmap(NULL, buf.length,
+ PROT_READ | PROT_WRITE, MAP_SHARED,
+ vid_fd, buf.m.offset);
+ perror_exit(MAP_FAILED == p_src_buf[i], "mmap");
+ }
+
+ for (i = 0; i < num_dst_bufs; ++i) {
+ buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ buf.memory = V4L2_MEMORY_MMAP;
+ buf.index = i;
+
+ ret = ioctl(vid_fd, VIDIOC_QUERYBUF, &buf);
+ perror_exit(ret != 0, "ioctl");
+ debug("QUERYBUF returned offset: %x\n", buf.m.offset);
+
+ dst_buf_size[i] = buf.length;
+ p_dst_buf[i] = mmap(NULL, buf.length,
+ PROT_READ | PROT_WRITE, MAP_SHARED,
+ vid_fd, buf.m.offset);
+ perror_exit(MAP_FAILED == p_dst_buf[i], "mmap");
+ }
+
+ for (i = 0; i < num_src_bufs; ++i) {
+
+ gen_src_buf(p_src_buf[i], src_buf_size[i]);
+
+ memzero(buf);
+ buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+ buf.memory = V4L2_MEMORY_MMAP;
+ buf.index = i;
+
+ ret = ioctl(vid_fd, VIDIOC_QBUF, &buf);
+ perror_exit(ret != 0, "ioctl");
+ }
+
+ for (i = 0; i < num_dst_bufs; ++i) {
+ memzero(buf);
+ buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ buf.memory = V4L2_MEMORY_MMAP;
+ buf.index = i;
+
+ ret = ioctl(vid_fd, VIDIOC_QBUF, &buf);
+ perror_exit(ret != 0, "ioctl");
+ }
+
+ ret = ioctl(vid_fd, VIDIOC_STREAMON, &type);
+ debug("STREAMON (%d): %d\n", VIDIOC_STREAMON, ret);
+ perror_exit(ret != 0, "ioctl");
+
+ while (num_frames) {
+ fd_set read_fds;
+ int r;
+
+ FD_ZERO(&read_fds);
+ FD_SET(vid_fd, &read_fds);
+
+ debug("Before select");
+ r = select(vid_fd + 1, &read_fds, NULL, NULL, 0);
+ perror_exit(r < 0, "select");
+ debug("After select");
+
+ if (num_frames == 1)
+ last = 1;
+ if (read_frame(last)) {
+ fprintf(stderr, "Read frame failed\n");
+ break;
+ }
+ --num_frames;
+ printf("FRAMES LEFT: %d\n", num_frames);
+ }
+
+
+done:
+ close(vid_fd);
+ close(fb_fd);
+
+ for (i = 0; i < num_src_bufs; ++i)
+ munmap(p_src_buf[i], src_buf_size[i]);
+
+ for (i = 0; i < num_dst_bufs; ++i)
+ munmap(p_dst_buf[i], dst_buf_size[i]);
+
+ return ret;
+}
+
--
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