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Copy pathsdlvideoviewer-rgb565x.c
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sdlvideoviewer-rgb565x.c
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/**
* Copyright (C) 2012 by Tomasz Moń <desowin@gmail.com>
*
* compile with:
* gcc -o sdlvideoviewer-rgb565x sdlvideoviewer-rgb565x.c -lSDL
*
* Based on V4L2 video capture example and process-vmalloc.c
* Capture+output (process) V4L2 device tester.
*
* Pawel Osciak, p.osciak <at> samsung.com
* 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 <SDL/SDL.h>
#include <assert.h>
#include <stdint.h>
#include <stdlib.h>
#include <endian.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#define __USE_BSD
#include <getopt.h> /* getopt_long() */
#include <fcntl.h> /* low-level i/o */
#include <unistd.h>
#include <errno.h>
#include <malloc.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <asm/types.h> /* for videodev2.h */
#include <linux/videodev2.h>
#define CLEAR(x) memset (&(x), 0, sizeof (x))
#define max(a, b) (a > b ? a : b)
#define min(a, b) (a > b ? b : a)
typedef enum
{
IO_METHOD_READ,
IO_METHOD_MMAP,
IO_METHOD_USERPTR,
} io_method;
struct buffer
{
void *start;
size_t length;
};
static char *dev_name = NULL;
static char *mem2mem_dev_name = NULL;
static io_method io = IO_METHOD_MMAP;
static int fd = -1;
struct buffer *buffers = NULL;
static unsigned int n_buffers = 0;
static int hflip = 0;
static int vflip = 0;
static size_t WIDTH = 640;
static size_t HEIGHT = 240;
/* Spacing between input and output display */
#define SEPARATOR 10
/*
* data stored in V4L2_PIX_FMT_RGB565X-like format
*
* Difference between original format is that higher three bits of green
* are swapped with lower three bits of green.
*/
static uint16_t *buffer_sdl;
static uint16_t *buffer_m2m_sdl;
SDL_Surface *data_sf;
SDL_Surface *data_m2m_sf;
#define V4L2_CID_TRANS_TIME_MSEC (V4L2_CID_PRIVATE_BASE)
#define V4L2_CID_TRANS_NUM_BUFS (V4L2_CID_PRIVATE_BASE + 1)
#define NUM_BUFS 4
#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 mem2mem_fd;
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;
/* transize = WIDTH*HEIGHT/translen*2 */
static int transsize;
/* Command-line params */
int translen = 1;
/* For displaying multi-buffer transaction simulations, indicates current
buffer in an ongoing transaction */
int curr_buf = 0;
int transtime = 1;
int num_frames = 1000;
static void errno_exit(const char *s)
{
fprintf(stderr, "%s error %d, %s\n", s, errno, strerror(errno));
exit(EXIT_FAILURE);
}
static int xioctl(int fd, int request, void *arg)
{
int r;
do
{
r = ioctl(fd, request, arg);
}
while (-1 == r && EINTR == errno);
return r;
}
static void render(SDL_Surface * pre, SDL_Surface * post)
{
SDL_Rect rect_pre = {
.x = 0,.y = 0,
.w = WIDTH,.h = HEIGHT
};
SDL_Rect rect_post = {
.x = 0,.y = HEIGHT + SEPARATOR,
.w = WIDTH,.h = HEIGHT
};
SDL_Surface *screen = SDL_GetVideoSurface();
SDL_BlitSurface(pre, NULL, screen, &rect_pre);
SDL_BlitSurface(post, NULL, screen, &rect_post);
SDL_UpdateRect(screen, 0, 0, 0, 0);
}
void YCbCrToRGB(int y, int cb, int cr, uint8_t * r, uint8_t * g, uint8_t * b)
{
double Y = (double)y;
double Cb = (double)cb;
double Cr = (double)cr;
int R = (int)(Y + 1.40200 * (Cr - 0x80));
int G = (int)(Y - 0.34414 * (Cb - 0x80) - 0.71414 * (Cr - 0x80));
int B = (int)(Y + 1.77200 * (Cb - 0x80));
*r = max(0, min(255, R));
*g = max(0, min(255, G));
*b = max(0, min(255, B));
}
/*
* YCbCr to RGB lookup table
*
* Indexes are [Y][Cb][Cr]
* Y, Cb, Cr range is 0-255
*
* Stored value bits:
* 24-16 Red
* 15-8 Green
* 7-0 Blue
*/
uint32_t YCbCr_to_RGB[256][256][256];
static void generate_YCbCr_to_RGB_lookup()
{
int y;
int cb;
int cr;
for (y = 0; y < 256; y++)
{
for (cb = 0; cb < 256; cb++)
{
for (cr = 0; cr < 256; cr++)
{
double Y = (double)y;
double Cb = (double)cb;
double Cr = (double)cr;
int R = (int)(Y + 1.40200 * (Cr - 0x80));
int G =
(int)(Y - 0.34414 * (Cb - 0x80) - 0.71414 * (Cr - 0x80));
int B = (int)(Y + 1.77200 * (Cb - 0x80));
R = max(0, min(255, R));
G = max(0, min(255, G));
B = max(0, min(255, B));
YCbCr_to_RGB[y][cb][cr] = R << 16 | G << 8 | B;
}
}
}
}
#define COLOR_GET_RED(color) ((color >> 16) & 0xFF)
#define COLOR_GET_GREEN(color) ((color >> 8) & 0xFF)
#define COLOR_GET_BLUE(color) (color & 0xFF)
/**
* Converts RGB888 color to RGB565
*/
static uint16_t inline RGB888_to_RGB565(uint32_t rgb)
{
uint16_t tmp;
tmp = ((rgb >> 3) & 0x1F) << 11 | /* Blue */
((rgb >> 10) & 0x3F) << 5 | /* Green */
((rgb >> 19) & 0x1F); /* Red */
#if __BYTE_ORDER == __LITTLE_ENDIAN
/* In LE lower byte is stored under lower address */
tmp = ((tmp >> 8) & 0xFF) | ((tmp & 0xFF) << 8);
#elif __BYTE_ORDER == __BIG_ENDIAN
/* Nothing to do */
#else
#error "Unknown Endianess"
#endif
return tmp;
}
/**
* Converts YUV422 to RGB565
* Before first use call generate_YCbCr_to_RGB_lookup();
*
* input is pointer to YUV422 encoded data in following order: Y0, Cb, Y1, Cr.
* output is pointer to 16 bit RGB565X buffer.
*/
static void inline YUV422_to_RGB565(uint16_t * output, const uint8_t * input)
{
uint8_t y0 = input[0];
uint8_t cb = input[1];
uint8_t y1 = input[2];
uint8_t cr = input[3];
uint32_t rgb = YCbCr_to_RGB[y0][cb][cr];
output[0] = RGB888_to_RGB565(rgb);
rgb = YCbCr_to_RGB[y1][cb][cr];
output[1] = RGB888_to_RGB565(rgb);
}
static void process_image(const void *p)
{
const uint8_t *buffer_yuv = p;
size_t x;
size_t y;
for (y = 0; y < HEIGHT; y++)
for (x = 0; x < WIDTH; x += 2)
YUV422_to_RGB565(&buffer_sdl[y * WIDTH + x],
buffer_yuv + (y * WIDTH + x) * 2);
}
static int read_frame(void)
{
struct v4l2_buffer buf;
unsigned int i;
switch (io)
{
case IO_METHOD_READ:
if (-1 == read(fd, buffers[0].start, buffers[0].length))
{
switch (errno)
{
case EAGAIN:
return 0;
case EIO:
/* Could ignore EIO, see spec. */
/* fall through */
default:
errno_exit("read");
}
}
process_image(buffers[0].start);
break;
case IO_METHOD_MMAP:
CLEAR(buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
if (-1 == xioctl(fd, VIDIOC_DQBUF, &buf))
{
switch (errno)
{
case EAGAIN:
return 0;
case EIO:
/* Could ignore EIO, see spec. */
/* fall through */
default:
errno_exit("VIDIOC_DQBUF");
}
}
assert(buf.index < n_buffers);
process_image(buffers[buf.index].start);
if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
errno_exit("VIDIOC_QBUF");
break;
case IO_METHOD_USERPTR:
CLEAR(buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_USERPTR;
if (-1 == xioctl(fd, VIDIOC_DQBUF, &buf))
{
switch (errno)
{
case EAGAIN:
return 0;
case EIO:
/* Could ignore EIO, see spec. */
/* fall through */
default:
errno_exit("VIDIOC_DQBUF");
}
}
for (i = 0; i < n_buffers; ++i)
if (buf.m.userptr == (unsigned long)buffers[i].start
&& buf.length == buffers[i].length)
break;
assert(i < n_buffers);
process_image((void *)buf.m.userptr);
if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
errno_exit("VIDIOC_QBUF");
break;
}
return 1;
}
static void read_input_frame(void)
{
for (;;)
{
fd_set fds;
struct timeval tv;
int r;
FD_ZERO(&fds);
FD_SET(fd, &fds);
/* Timeout. */
tv.tv_sec = 2;
tv.tv_usec = 0;
r = select(fd + 1, &fds, NULL, NULL, &tv);
if (-1 == r)
{
if (EINTR == errno)
continue;
errno_exit("select");
}
if (0 == r)
{
fprintf(stderr, "select timeout\n");
exit(EXIT_FAILURE);
}
if (read_frame())
break;
/* EAGAIN - continue select loop. */
}
}
static void stop_capturing(void)
{
enum v4l2_buf_type type;
switch (io)
{
case IO_METHOD_READ:
/* Nothing to do. */
break;
case IO_METHOD_MMAP:
case IO_METHOD_USERPTR:
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (-1 == xioctl(fd, VIDIOC_STREAMOFF, &type))
errno_exit("VIDIOC_STREAMOFF");
break;
}
}
static void start_capturing(void)
{
unsigned int i;
enum v4l2_buf_type type;
switch (io)
{
case IO_METHOD_READ:
/* Nothing to do. */
break;
case IO_METHOD_MMAP:
for (i = 0; i < n_buffers; ++i)
{
struct v4l2_buffer buf;
CLEAR(buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
errno_exit("VIDIOC_QBUF");
}
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (-1 == xioctl(fd, VIDIOC_STREAMON, &type))
errno_exit("VIDIOC_STREAMON");
break;
case IO_METHOD_USERPTR:
for (i = 0; i < n_buffers; ++i)
{
struct v4l2_buffer buf;
CLEAR(buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_USERPTR;
buf.index = i;
buf.m.userptr = (unsigned long)buffers[i].start;
buf.length = buffers[i].length;
if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
errno_exit("VIDIOC_QBUF");
}
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (-1 == xioctl(fd, VIDIOC_STREAMON, &type))
errno_exit("VIDIOC_STREAMON");
break;
}
}
static void uninit_device(void)
{
unsigned int i;
switch (io)
{
case IO_METHOD_READ:
free(buffers[0].start);
break;
case IO_METHOD_MMAP:
for (i = 0; i < n_buffers; ++i)
if (-1 == munmap(buffers[i].start, buffers[i].length))
errno_exit("munmap");
break;
case IO_METHOD_USERPTR:
for (i = 0; i < n_buffers; ++i)
free(buffers[i].start);
break;
}
free(buffers);
}
static void init_read(unsigned int buffer_size)
{
buffers = calloc(1, sizeof(*buffers));
if (!buffers)
{
fprintf(stderr, "Out of memory\n");
exit(EXIT_FAILURE);
}
buffers[0].length = buffer_size;
buffers[0].start = malloc(buffer_size);
if (!buffers[0].start)
{
fprintf(stderr, "Out of memory\n");
exit(EXIT_FAILURE);
}
}
static void init_mmap(void)
{
struct v4l2_requestbuffers req;
CLEAR(req);
req.count = 4;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
if (-1 == xioctl(fd, VIDIOC_REQBUFS, &req))
{
if (EINVAL == errno)
{
fprintf(stderr, "%s does not support "
"memory mapping\n", dev_name);
exit(EXIT_FAILURE);
}
else
{
errno_exit("VIDIOC_REQBUFS");
}
}
if (req.count < 2)
{
fprintf(stderr, "Insufficient buffer memory on %s\n", dev_name);
exit(EXIT_FAILURE);
}
buffers = calloc(req.count, sizeof(*buffers));
if (!buffers)
{
fprintf(stderr, "Out of memory\n");
exit(EXIT_FAILURE);
}
for (n_buffers = 0; n_buffers < req.count; ++n_buffers)
{
struct v4l2_buffer buf;
CLEAR(buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = n_buffers;
if (-1 == xioctl(fd, VIDIOC_QUERYBUF, &buf))
errno_exit("VIDIOC_QUERYBUF");
buffers[n_buffers].length = buf.length;
buffers[n_buffers].start = mmap(NULL /* start anywhere */ ,
buf.length, PROT_READ | PROT_WRITE /* required
*/ ,
MAP_SHARED /* recommended */ ,
fd, buf.m.offset);
if (MAP_FAILED == buffers[n_buffers].start)
errno_exit("mmap");
}
}
static void init_userp(unsigned int buffer_size)
{
struct v4l2_requestbuffers req;
unsigned int page_size;
page_size = getpagesize();
buffer_size = (buffer_size + page_size - 1) & ~(page_size - 1);
CLEAR(req);
req.count = 4;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_USERPTR;
if (-1 == xioctl(fd, VIDIOC_REQBUFS, &req))
{
if (EINVAL == errno)
{
fprintf(stderr, "%s does not support "
"user pointer i/o\n", dev_name);
exit(EXIT_FAILURE);
}
else
{
errno_exit("VIDIOC_REQBUFS");
}
}
buffers = calloc(4, sizeof(*buffers));
if (!buffers)
{
fprintf(stderr, "Out of memory\n");
exit(EXIT_FAILURE);
}
for (n_buffers = 0; n_buffers < 4; ++n_buffers)
{
buffers[n_buffers].length = buffer_size;
buffers[n_buffers].start = memalign( /* boundary */ page_size,
buffer_size);
if (!buffers[n_buffers].start)
{
fprintf(stderr, "Out of memory\n");
exit(EXIT_FAILURE);
}
}
}
static void init_device(void)
{
struct v4l2_capability cap;
struct v4l2_cropcap cropcap;
struct v4l2_crop crop;
struct v4l2_format fmt;
unsigned int min;
if (-1 == xioctl(fd, VIDIOC_QUERYCAP, &cap))
{
if (EINVAL == errno)
{
fprintf(stderr, "%s is no V4L2 device\n", dev_name);
exit(EXIT_FAILURE);
}
else
{
errno_exit("VIDIOC_QUERYCAP");
}
}
if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
{
fprintf(stderr, "%s is no video capture device\n", dev_name);
exit(EXIT_FAILURE);
}
switch (io)
{
case IO_METHOD_READ:
if (!(cap.capabilities & V4L2_CAP_READWRITE))
{
fprintf(stderr, "%s does not support read i/o\n", dev_name);
exit(EXIT_FAILURE);
}
break;
case IO_METHOD_MMAP:
case IO_METHOD_USERPTR:
if (!(cap.capabilities & V4L2_CAP_STREAMING))
{
fprintf(stderr, "%s does not support streaming i/o\n", dev_name);
exit(EXIT_FAILURE);
}
break;
}
/* Select video input, video standard and tune here. */
CLEAR(cropcap);
cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (0 == xioctl(fd, VIDIOC_CROPCAP, &cropcap))
{
crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
crop.c = cropcap.defrect; /* reset to default */
if (-1 == xioctl(fd, VIDIOC_S_CROP, &crop))
{
switch (errno)
{
case EINVAL:
/* Cropping not supported. */
break;
default:
/* Errors ignored. */
break;
}
}
}
else
{
/* Errors ignored. */
}
CLEAR(fmt);
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = WIDTH;
fmt.fmt.pix.height = HEIGHT;
fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
if (-1 == xioctl(fd, VIDIOC_S_FMT, &fmt))
errno_exit("VIDIOC_S_FMT");
/* Note VIDIOC_S_FMT may change width and height. */
/* Buggy driver paranoia. */
min = fmt.fmt.pix.width * 2;
if (fmt.fmt.pix.bytesperline < min)
fmt.fmt.pix.bytesperline = min;
min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height;
if (fmt.fmt.pix.sizeimage < min)
fmt.fmt.pix.sizeimage = min;
if (fmt.fmt.pix.width != WIDTH)
WIDTH = fmt.fmt.pix.width;
if (fmt.fmt.pix.height != HEIGHT)
HEIGHT = fmt.fmt.pix.height;
switch (io)
{
case IO_METHOD_READ:
init_read(fmt.fmt.pix.sizeimage);
break;
case IO_METHOD_MMAP:
init_mmap();
break;
case IO_METHOD_USERPTR:
init_userp(fmt.fmt.pix.sizeimage);
break;
}
}
static void close_device(void)
{
if (-1 == close(fd))
errno_exit("close");
fd = -1;
}
static void open_device(void)
{
struct stat st;
if (-1 == stat(dev_name, &st))
{
fprintf(stderr, "Cannot identify '%s': %d, %s\n",
dev_name, errno, strerror(errno));
exit(EXIT_FAILURE);
}
if (!S_ISCHR(st.st_mode))
{
fprintf(stderr, "%s is no device\n", dev_name);
exit(EXIT_FAILURE);
}
fd = open(dev_name, O_RDWR /* required */ | O_NONBLOCK, 0);
if (-1 == fd)
{
fprintf(stderr, "Cannot open '%s': %d, %s\n",
dev_name, errno, strerror(errno));
exit(EXIT_FAILURE);
}
}
static void init_mem2mem_dev()
{
int ret;
struct v4l2_capability cap;
struct v4l2_format fmt;
struct v4l2_control ctrl;
mem2mem_fd = open(mem2mem_dev_name, O_RDWR | O_NONBLOCK, 0);
perror_exit(mem2mem_fd < 0, "open");
if (hflip != 0)
{
ctrl.id = V4L2_CID_HFLIP;
ctrl.value = 1;
ret = ioctl(mem2mem_fd, VIDIOC_S_CTRL, &ctrl);
if (ret != 0)
fprintf(stderr, "%s:%d: Set HFLIP failed\n",
__func__, __LINE__);
}
if (vflip != 0)
{
ctrl.id = V4L2_CID_VFLIP;
ctrl.value = 1;
ret = ioctl(mem2mem_fd, VIDIOC_S_CTRL, &ctrl);
if (ret != 0)
fprintf(stderr, "%s:%d: Set VFLIP failed\n",
__func__, __LINE__);
}
ctrl.id = V4L2_CID_TRANS_TIME_MSEC;
ctrl.value = transtime;
ret = ioctl(mem2mem_fd, VIDIOC_S_CTRL, &ctrl);
perror_exit(ret != 0, "ioctl");
ctrl.id = V4L2_CID_TRANS_NUM_BUFS;
ctrl.value = translen;
ret = ioctl(mem2mem_fd, VIDIOC_S_CTRL, &ctrl);
perror_exit(ret != 0, "ioctl");
ret = ioctl(mem2mem_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(mem2mem_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(mem2mem_fd, VIDIOC_S_FMT, &fmt);
perror_exit(ret != 0, "ioctl");
}
static void gen_buf(uint8_t * dst, uint8_t * src, size_t size)
{
size_t i;
uint16_t tmp;
uint16_t *dst_buf = (uint16_t *) dst;
uint16_t *src_buf = (uint16_t *) src;
size /= 2;
for (i = 0; i < size; i++)
{
tmp = src_buf[i];
/*
* V4L2_PIX_FMT_RGB565X stores most significant Green bits in
* byte 0. Since SDL displays otherwise, swap those here.
*/
dst_buf[i] = ((tmp & 0xE000) >> 13) | ((tmp & 0x0007) << 13) |
(tmp & 0x1FF8);
}
}
static int read_mem2mem_frame(int last)
{
struct v4l2_buffer buf;
int ret;
memzero(buf);
buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
buf.memory = V4L2_MEMORY_MMAP;
ret = ioctl(mem2mem_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)
{
uint8_t *p_buf = (uint8_t *) buffer_sdl;
p_buf += curr_buf * transsize;
gen_buf((uint8_t *) p_src_buf[buf.index], p_buf, transsize);
buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
buf.memory = V4L2_MEMORY_MMAP;
ret = ioctl(mem2mem_fd, VIDIOC_QBUF, &buf);
perror_ret(ret != 0, "ioctl");
}
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
debug("Dequeuing destination buffer\n");
ret = ioctl(mem2mem_fd, VIDIOC_DQBUF, &buf);
if (ret)
{
switch (errno)
{