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uvc-gadget.c
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uvc-gadget.c
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/*
* UVC gadget application
*
* Modified by Matthias Deeg (mdeeg)
*
* Changes: PNG images as source
* L8 images (greyscale) as source
* removed some functionality
*
* Modified by Petr Vavrin (peterbay) <[email protected]>
*
* Github: https://github.com/peterbay/uvc-gadget
*
* Added: video controls
* resolution changing
* framebuffer as source device
* code refactoring
* enhanced logging
* etc.
*
* Source tree:
* Primary source - wlhe - https://github.com/wlhe/uvc-gadget
* Forked source - climberhunt (Dave Hunt) - https://github.com/climberhunt/uvc-gadget
* Forked source - peterbay (Petr Vavrin) - https://github.com/peterbay/uvc-gadget
*
* Original author:
* Copyright (C) 2010 Ideas on board SPRL <[email protected]>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
*/
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <stdbool.h>
#include <time.h>
#include <ftw.h>
#include <png.h>
#include <linux/usb/ch9.h>
#include <linux/usb/video.h>
#include <linux/videodev2.h>
#include <linux/fb.h>
#include "uvc-gadget.h"
volatile sig_atomic_t terminate = 0;
void term(int signum)
{
(void)(signum); /* avoid warning: unused parameter 'signum' */
terminate = 1;
}
static int sys_gpio_write(unsigned int type, char pin[], char value[])
{
FILE *sys_file;
char path[255];
strcpy(path, "/sys/class/gpio/");
switch(type) {
case GPIO_EXPORT:
strcat(path, "export");
value = pin;
break;
case GPIO_DIRECTION:
strcat(path, "gpio");
strcat(path, pin);
strcat(path, "/direction");
break;
case GPIO_VALUE:
strcat(path, "gpio");
strcat(path, pin);
strcat(path, "/value");
break;
}
printf("GPIO WRITE: Path: %s, Value: %s\n", path, value);
sys_file = fopen(path, "w");
if (!sys_file) {
printf("GPIO ERROR: File write failed: %s (%d).\n", strerror(errno), errno);
return -1;
}
fwrite(value, 1, strlen(value), sys_file);
fclose(sys_file);
return 0;
}
static int sys_led_write(unsigned int type, char value[])
{
FILE *sys_file;
char path[255];
strcpy(path, "/sys/class/leds/led0/");
switch(type) {
case LED_TRIGGER:
strcat(path, "trigger");
break;
case LED_BRIGHTNESS:
strcat(path, "brightness");
break;
}
printf("LED WRITE: Path: %s, Value: %s\n", path, value);
sys_file = fopen(path, "w");
if (!sys_file) {
printf("LED ERROR: File write failed: %s (%d).\n", strerror(errno), errno);
return -1;
}
fwrite(value, 1, strlen(value), sys_file);
fclose(sys_file);
return 0;
}
static void streaming_status_enable()
{
int ret;
if (!settings.streaming_status_enabled && settings.streaming_status_pin) {
ret = sys_gpio_write(GPIO_EXPORT, settings.streaming_status_pin, NULL);
if (ret < 0) {
return;
}
ret = sys_gpio_write(GPIO_DIRECTION, settings.streaming_status_pin, GPIO_DIRECTION_OUT);
if (ret < 0) {
return;
}
ret = sys_gpio_write(GPIO_VALUE, settings.streaming_status_pin, GPIO_VALUE_OFF);
if (ret < 0) {
return;
}
settings.streaming_status_enabled = true;
}
if (settings.streaming_status_onboard) {
ret = sys_led_write(LED_TRIGGER, LED_TRIGGER_NONE);
if (ret < 0) {
return;
}
ret = sys_led_write(LED_BRIGHTNESS, LED_BRIGHTNESS_LOW);
if (ret < 0) {
return;
}
settings.streaming_status_onboard_enabled = true;
}
return;
}
static void streaming_status_value(bool state)
{
char *gpio_value = (state) ? GPIO_VALUE_ON : GPIO_VALUE_OFF;
char *led_value = (state) ? LED_BRIGHTNESS_HIGH : LED_BRIGHTNESS_LOW;
if (settings.streaming_status_enabled) {
sys_gpio_write(GPIO_VALUE, settings.streaming_status_pin, gpio_value);
}
if (settings.streaming_status_onboard_enabled) {
sys_led_write(LED_BRIGHTNESS, led_value);
}
}
static char *uvc_request_code_name(unsigned int uvc_control)
{
switch (uvc_control) {
case UVC_RC_UNDEFINED:
return "RC_UNDEFINED";
case UVC_SET_CUR:
return "SET_CUR";
case UVC_GET_CUR:
return "GET_CUR";
case UVC_GET_MIN:
return "GET_MIN";
case UVC_GET_MAX:
return "GET_MAX";
case UVC_GET_RES:
return "GET_RES";
case UVC_GET_LEN:
return "GET_LEN";
case UVC_GET_INFO:
return "GET_INFO";
case UVC_GET_DEF:
return "GET_DEF";
default:
return "UNKNOWN";
}
}
static char *uvc_vs_interface_control_name(unsigned int interface)
{
switch (interface) {
case UVC_VS_CONTROL_UNDEFINED:
return "CONTROL_UNDEFINED";
case UVC_VS_PROBE_CONTROL:
return "PROBE";
case UVC_VS_COMMIT_CONTROL:
return "COMMIT";
case UVC_VS_STILL_PROBE_CONTROL:
return "STILL_PROBE";
case UVC_VS_STILL_COMMIT_CONTROL:
return "STILL_COMMIT";
case UVC_VS_STILL_IMAGE_TRIGGER_CONTROL:
return "STILL_IMAGE_TRIGGER";
case UVC_VS_STREAM_ERROR_CODE_CONTROL:
return "STREAM_ERROR_CODE";
case UVC_VS_GENERATE_KEY_FRAME_CONTROL:
return "GENERATE_KEY_FRAME";
case UVC_VS_UPDATE_FRAME_SEGMENT_CONTROL:
return "UPDATE_FRAME_SEGMENT";
case UVC_VS_SYNC_DELAY_CONTROL:
return "SYNC_DELAY";
default:
return "UNKNOWN";
}
}
static unsigned int get_frame_size(int pixelformat, int width, int height)
{
switch (pixelformat) {
case V4L2_PIX_FMT_YUYV:
return width *height * 2;
case V4L2_PIX_FMT_MJPEG:
return width * height;
break;
}
return width * height;
}
static int uvc_open(char *devname, unsigned int nbufs)
{
struct v4l2_capability cap;
const char *type_name = "DEVICE_UVC";
printf("%s: Opening %s device\n", type_name, devname);
uvc_dev.fd = open(devname, O_RDWR | O_NONBLOCK, 0);
if (uvc_dev.fd == -1) {
printf("%s: Device open failed: %s (%d).\n", type_name, strerror(errno), errno);
return -EINVAL;
}
if (ioctl(uvc_dev.fd, VIDIOC_QUERYCAP, &cap) < 0) {
printf("%s: VIDIOC_QUERYCAP failed: %s (%d).\n", type_name, strerror(errno), errno);
goto err;
}
if (!(cap.capabilities & V4L2_CAP_VIDEO_OUTPUT)) {
printf("%s: %s is no video output device\n", type_name, devname);
goto err;
}
printf("%s: Device is %s on bus %s\n", type_name, cap.card, cap.bus_info);
uvc_dev.device_type = DEVICE_TYPE_UVC;
uvc_dev.device_type_name = type_name;
uvc_dev.buffer_type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
uvc_dev.memory_type = V4L2_MEMORY_USERPTR;
uvc_dev.nbufs = nbufs;
return 1;
err:
close(uvc_dev.fd);
uvc_dev.fd = -1;
return -EINVAL;
}
/*
* Load PNG image
*/
void load_png_image(char *filename)
{
int width;
int height;
png_byte color_type;
png_byte bit_depth;
png_bytep *row_pointers = NULL;
png_bytep pixel1;
png_bytep pixel2;
unsigned int yvyu;
char *pixels_buffer;
char *pixels_yuyv;
unsigned int buffer_size;
FILE *fp = fopen(filename, "rb");
png_structp png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png) abort();
png_infop info = png_create_info_struct(png);
if (!info) abort();
if (setjmp(png_jmpbuf(png))) abort();
png_init_io(png, fp);
png_read_info(png, info);
width = png_get_image_width(png, info);
height = png_get_image_height(png, info);
color_type = png_get_color_type(png, info);
bit_depth = png_get_bit_depth(png, info);
// Read any color_type into 8 bit depth, RGBA format.
// See http://www.libpng.org/pub/png/libpng-manual.txt
if (bit_depth == 16)
png_set_strip_16(png);
if (color_type == PNG_COLOR_TYPE_PALETTE)
png_set_palette_to_rgb(png);
// PNG_COLOR_TYPE_GRAY_ALPHA is always 8 or 16bit depth
if(color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
png_set_expand_gray_1_2_4_to_8(png);
if (png_get_valid(png, info, PNG_INFO_tRNS))
png_set_tRNS_to_alpha(png);
// These color_type don't have an alpha channel then fill it with 0xff.
if (color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_PALETTE)
png_set_filler(png, 0xFF, PNG_FILLER_AFTER);
if(color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png);
png_read_update_info(png, info);
if (row_pointers) abort();
row_pointers = (png_bytep*)malloc(sizeof(png_bytep) *height);
for(int y = 0; y < height; y++) {
row_pointers[y] = (png_byte*)malloc(png_get_rowbytes(png,info));
}
png_read_image(png, row_pointers);
fclose(fp);
png_destroy_read_struct(&png, &info, NULL);
// convert RGBA to YUYV
image_dev.image_width = width;
image_dev.image_height = height;
image_dev.image_size = width * height;
buffer_size = width * height * 4 * (bit_depth / 8);
image_dev.image_uncompressed_mem_size = width * height * 2;
pixels_buffer = malloc(buffer_size);
if (pixels_buffer == NULL) {
printf("[-] Error: Could allocate enough memory for the PNG pixel buffer");
exit(1);
}
image_dev.image_uncompressed_memory = malloc(image_dev.image_uncompressed_mem_size);
if (image_dev.image_uncompressed_memory == NULL) {
printf("[-] Error: Could allocate enough memory for the uncompressed image");
exit(1);
}
pixels_yuyv = image_dev.image_uncompressed_memory;
for (int y = 0; y < height; y++) {
png_bytep row = row_pointers[y];
for (int x = 0; x < width; x += 2) {
pixel1 = &(row[x * 4]);
pixel2 = &(row[(x + 1) * 4]);
yvyu = rgb2yvyu(pixel1[0], pixel1[1], pixel1[2], pixel2[0], pixel2[1], pixel2[2]);
memcpy(pixels_yuyv, &yvyu, 4);
pixels_yuyv += 4;
}
}
// free pixels buffer
free(pixels_buffer);
}
/*
* Load L8 image (8-bit grayscale)
*/
void load_l8_image(char *filename)
{
FILE *fp = fopen(filename, "rb");
if (fp == NULL) {
printf("[-] Error: Could not open L8 image '%s'\n", filename);
exit(1);
}
fseek(fp, 0, SEEK_END);
image_dev.image_l8_mem_size = ftell(fp);
fseek(fp, 0, SEEK_SET);
// hardcoded image size (for test purposes)
image_dev.image_width = 480;
image_dev.image_height = 480;
image_dev.image_size = 480 * 480;
image_dev.image_l8_memory = malloc(image_dev.image_l8_mem_size);
if (image_dev.image_l8_memory == NULL) {
printf("[-] Error: Could allocate enough memory for the L8 image");
exit(1);
}
fread(image_dev.image_l8_memory, 1, image_dev.image_l8_mem_size, fp);
fclose(fp);
}
/* ---------------------------------------------------------------------------
* V4L2 streaming related
*/
static void uvc_uninit_device()
{
unsigned int i;
if (settings.source_device == DEVICE_TYPE_IMAGE && uvc_dev.dummy_buf) {
printf("%s: Uninit device\n", uvc_dev.device_type_name);
for (i = 0; i < uvc_dev.nbufs; ++i) {
free(uvc_dev.dummy_buf[i].start);
uvc_dev.dummy_buf[i].start = NULL;
}
free(uvc_dev.dummy_buf);
uvc_dev.dummy_buf = NULL;
}
}
static int v4l2_video_stream_control(struct v4l2_device *dev, enum video_stream_action action)
{
int type = dev->buffer_type;
int ret;
if (action == STREAM_ON) {
ret = ioctl(dev->fd, VIDIOC_STREAMON, &type);
if (ret < 0) {
printf("%s: STREAM ON failed: %s (%d).\n", dev->device_type_name, strerror(errno), errno);
return ret;
}
printf("%s: STREAM ON success\n", dev->device_type_name);
dev->is_streaming = 1;
uvc_shutdown_requested = false;
} else if (dev->is_streaming) {
ret = ioctl(dev->fd, VIDIOC_STREAMOFF, &type);
if (ret < 0) {
printf("%s: STREAM OFF failed: %s (%d).\n", dev->device_type_name, strerror(errno), errno);
return ret;
}
printf("%s: STREAM OFF success\n", dev->device_type_name);
dev->is_streaming = 0;
}
return 0;
}
static int uvc_video_stream(enum video_stream_action action)
{
return v4l2_video_stream_control(&uvc_dev, action);
}
static int v4l2_init_buffers(struct v4l2_device *dev, struct v4l2_requestbuffers *req,
unsigned int count)
{
int ret;
req->count = count;
req->type = dev->buffer_type;
req->memory = dev->memory_type;
ret = ioctl(dev->fd, VIDIOC_REQBUFS, req);
if (ret < 0) {
if (ret == -EINVAL) {
printf("%s: Does not support %s\n", dev->device_type_name,
(dev->memory_type == V4L2_MEMORY_USERPTR) ? "user pointer I/O" : "memory mapping");
} else {
printf("%s: VIDIOC_REQBUFS error: %s (%d).\n",
dev->device_type_name, strerror(errno), errno);
}
return ret;
}
return count;
}
static int v4l2_reqbufs_mmap(struct v4l2_device *dev, struct v4l2_requestbuffers req)
{
int ret;
unsigned int i = 0;
/* Map the buffers. */
dev->mem = calloc(req.count, sizeof dev->mem[0]);
if (!dev->mem) {
printf("%s: Out of memory\n", dev->device_type_name);
ret = -ENOMEM;
goto err;
}
for (i = 0; i < req.count; ++i) {
CLEAR(dev->mem[i].buf);
dev->mem[i].buf.type = dev->buffer_type;
dev->mem[i].buf.memory = V4L2_MEMORY_MMAP;
dev->mem[i].buf.index = i;
ret = ioctl(dev->fd, VIDIOC_QUERYBUF, &(dev->mem[i].buf));
if (ret < 0) {
printf("%s: VIDIOC_QUERYBUF failed for buf %d: %s (%d).\n",
dev->device_type_name, i, strerror(errno), errno);
ret = -EINVAL;
goto err_free;
}
dev->mem[i].start =
mmap(NULL /* start anywhere */,
dev->mem[i].buf.length,
PROT_READ | PROT_WRITE /* required */,
MAP_SHARED /* recommended */,
dev->fd, dev->mem[i].buf.m.offset
);
if (MAP_FAILED == dev->mem[i].start) {
printf("%s: Unable to map buffer %u: %s (%d).\n",
dev->device_type_name, i, strerror(errno), errno);
dev->mem[i].length = 0;
ret = -EINVAL;
goto err_free;
}
dev->mem[i].length = dev->mem[i].buf.length;
printf("%s: Buffer %u mapped at address %p, length %d.\n",
dev->device_type_name, i, dev->mem[i].start, dev->mem[i].length);
}
return 0;
err_free:
free(dev->mem);
err:
return ret;
}
static int v4l2_reqbufs_userptr(struct v4l2_device *dev, struct v4l2_requestbuffers req)
{
unsigned int payload_size;
unsigned int i;
// Image device
if (dev->device_type == DEVICE_TYPE_UVC && settings.source_device == DEVICE_TYPE_IMAGE) {
/* Allocate buffers to hold dummy data pattern. */
dev->dummy_buf = calloc(req.count, sizeof dev->dummy_buf[0]);
if (!dev->dummy_buf) {
printf("%s: Out of memory\n", dev->device_type_name);
return -ENOMEM;
}
payload_size = image_dev.image_mem_size;
for (i = 0; i < req.count; ++i) {
dev->dummy_buf[i].length = payload_size;
dev->dummy_buf[i].start = malloc(payload_size);
if (!dev->dummy_buf[i].start) {
printf("%s: Out of memory\n", dev->device_type_name);
return -ENOMEM;
}
}
dev->mem = dev->dummy_buf;
}
return 0;
}
static int v4l2_reqbufs(struct v4l2_device *dev, int nbufs)
{
int ret = 0;
struct v4l2_requestbuffers req;
CLEAR(req);
dev->dqbuf_count = 0;
dev->qbuf_count = 0;
ret = v4l2_init_buffers(dev, &req, nbufs);
if (ret < 1) {
return ret;
}
if (!req.count) {
return 0;
}
if (dev->memory_type == V4L2_MEMORY_MMAP) {
if (req.count < 2) {
printf("%s: Insufficient buffer memory.\n", dev->device_type_name);
return -EINVAL;
}
ret = v4l2_reqbufs_mmap(dev, req);
if (ret < 0) {
return -EINVAL;
}
}
if (dev->memory_type == V4L2_MEMORY_USERPTR && settings.source_device == DEVICE_TYPE_IMAGE) {
if (req.count < 2) {
printf("%s: Insufficient buffer memory.\n", dev->device_type_name);
return -EINVAL;
}
ret = v4l2_reqbufs_userptr(dev, req);
if (ret < 0) {
return -EINVAL;
}
}
dev->nbufs = req.count;
printf("%s: %u buffers allocated.\n", dev->device_type_name, req.count);
return ret;
}
static int uvc_request_bufs(int nbufs)
{
return v4l2_reqbufs(&uvc_dev, nbufs);
}
static int uvc_video_qbuf()
{
unsigned int i;
int ret;
// Image device
for (i = 0; i < uvc_dev.nbufs; ++i) {
struct v4l2_buffer buf;
CLEAR(buf);
buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
buf.memory = V4L2_MEMORY_USERPTR;
buf.m.userptr = (unsigned long) uvc_dev.dummy_buf[i].start;
buf.length = uvc_dev.dummy_buf[i].length;
buf.index = i;
buf.bytesused = 0;
ret = ioctl(uvc_dev.fd, VIDIOC_QBUF, &buf);
if (ret < 0) {
printf("UVC: VIDIOC_QBUF failed : %s (%d).\n", strerror(errno), errno);
return ret;
}
uvc_dev.qbuf_count++;
}
return 0;
}
/*
* V4L2 generic stuff
*/
static int v4l2_get_format(struct v4l2_device *dev)
{
struct v4l2_format fmt;
int ret;
CLEAR(fmt);
fmt.type = dev->buffer_type;
ret = ioctl(dev->fd, VIDIOC_G_FMT, &fmt);
if (ret < 0) {
return ret;
}
printf("%s: Getting current format: %c%c%c%c %ux%u\n",
dev->device_type_name, pixfmtstr(fmt.fmt.pix.pixelformat),
fmt.fmt.pix.width, fmt.fmt.pix.height);
return 0;
}
static int v4l2_set_format(struct v4l2_device *dev, struct v4l2_format *fmt)
{
int ret;
ret = ioctl(dev->fd, VIDIOC_S_FMT, fmt);
if (ret < 0) {
printf("%s: Unable to set format %s (%d).\n",
dev->device_type_name, strerror(errno), errno);
return ret;
}
printf("%s: Setting format to: %c%c%c%c %ux%u\n",
dev->device_type_name, pixfmtstr(fmt->fmt.pix.pixelformat),
fmt->fmt.pix.width, fmt->fmt.pix.height);
return 0;
}
static int v4l2_apply_format(struct v4l2_device *dev, unsigned int pixelformat,
unsigned int width, unsigned int height)
{
struct v4l2_format fmt;
int ret = -EINVAL;
if (dev->is_streaming || !dev->fd) {
return ret;
}
CLEAR(fmt);
fmt.type = dev->buffer_type;
fmt.fmt.pix.width = width;
fmt.fmt.pix.height = height;
fmt.fmt.pix.sizeimage = get_frame_size(pixelformat, width, height);
fmt.fmt.pix.pixelformat = pixelformat;
fmt.fmt.pix.field = V4L2_FIELD_ANY;
ret = v4l2_set_format(dev, &fmt);
if (ret < 0) {
return ret;
}
return v4l2_get_format(dev);
}
static void uvc_close()
{
if (uvc_dev.fd) {
close(uvc_dev.fd);
uvc_dev.fd = -1;
}
}
/*
* UVC streaming related
*/
static void uvc_image_fill_buffer(struct v4l2_buffer *buf)
{
char *uvc_pixels = (char *)uvc_dev.mem[buf->index].start;
buf->bytesused = image_dev.image_mem_size;
memcpy(uvc_pixels, image_dev.image_memory, image_dev.image_mem_size);
}
static void uvc_image_video_process()
{
struct v4l2_buffer ubuf;
/*
* Return immediately if UVC video output device has not started
* streaming yet.
*/
if (!uvc_dev.is_streaming) {
return;
}
/* Prepare a v4l2 buffer to be dequeued from UVC domain. */
CLEAR(ubuf);
ubuf.type = uvc_dev.buffer_type;
ubuf.memory = uvc_dev.memory_type;
if (ioctl(uvc_dev.fd, VIDIOC_DQBUF, &ubuf) < 0) {
printf("%s: Unable to dequeue buffer: %s (%d).\n",
uvc_dev.device_type_name, strerror(errno), errno);
return;
}
uvc_image_fill_buffer(&ubuf);
if (ioctl(uvc_dev.fd, VIDIOC_QBUF, &ubuf) < 0) {
printf("%s: Unable to queue buffer: %s (%d).\n",
uvc_dev.device_type_name, strerror(errno), errno);
return;
}
uvc_dev.qbuf_count++;
if (settings.show_fps) {
uvc_dev.buffers_processed++;
}
}
static void uvc_handle_streamon_event()
{
printf("Stream On Event\n");
// Video4Linux2 device
if (uvc_request_bufs(uvc_dev.nbufs) < 0) {
return;
}
// Image device
if (settings.source_device == DEVICE_TYPE_IMAGE) {
if (uvc_video_qbuf() < 0) {
return;
}
uvc_video_stream(STREAM_ON);
settings.blink_on_startup = 0;
streaming_status_value(uvc_dev.is_streaming);
}
}
static void uvc_handle_streamoff_event()
{
uvc_video_stream(STREAM_OFF);
uvc_request_bufs(0);
uvc_uninit_device();
streaming_status_value(uvc_dev.is_streaming);
}
/*
* UVC Request processing
*/
static void dump_uvc_streaming_control(struct uvc_streaming_control *ctrl)
{
printf("DUMP: uvc_streaming_control: format: %d, frame: %d, frame interval: %d\n",
ctrl->bFormatIndex,
ctrl->bFrameIndex,
ctrl->dwFrameInterval
);
}
static int uvc_get_frame_format_index(int format_index, enum uvc_frame_format_getter getter)
{
int index = -1;
int value;
int i;
for (i = 0; i <= last_format_index; i++) {
if (format_index == -1 || format_index == (int) uvc_frame_format[i].bFormatIndex) {
switch (getter) {
case FORMAT_INDEX_MIN:
case FORMAT_INDEX_MAX:
value = uvc_frame_format[i].bFormatIndex;
break;
case FRAME_INDEX_MIN:
case FRAME_INDEX_MAX:
value = uvc_frame_format[i].bFrameIndex;
break;
}
if (index == -1) {
index = value;
} else {
switch (getter) {
case FORMAT_INDEX_MIN:
case FRAME_INDEX_MIN:
if (value < index) {
index = value;
}
break;
case FORMAT_INDEX_MAX:
case FRAME_INDEX_MAX:
if (value > index) {
index = value;
}
break;
}
}
}
}
return index;
}
static int uvc_get_frame_format(struct uvc_frame_format **frame_format,
unsigned int iFormat, unsigned int iFrame)
{
int i;
for (i = 0; i <= last_format_index; i++) {
if (uvc_frame_format[i].bFormatIndex == iFormat &&
uvc_frame_format[i].bFrameIndex == iFrame
) {
*frame_format = &uvc_frame_format[i];
return 0;
}
}
return -1;
}
static void uvc_dump_frame_format(struct uvc_frame_format *frame_format, const char *title)
{
printf("%s: format: %d, frame: %d, resolution: %dx%d, frame_interval: %d, bitrate: [%d, %d]\n",
title,
frame_format->bFormatIndex,
frame_format->bFrameIndex,
frame_format->wWidth,
frame_format->wHeight,
frame_format->dwDefaultFrameInterval,
frame_format->dwMinBitRate,
frame_format->dwMaxBitRate
);
}
static void uvc_fill_streaming_control(struct uvc_streaming_control *ctrl,
enum stream_control_action action, int iformat, int iframe)
{
int format_first;
int format_last;
int frame_first;
int frame_last;
int format_frame_first;
int format_frame_last;
unsigned int frame_interval;
unsigned int dwMaxPayloadTransferSize;
switch (action) {
case STREAM_CONTROL_INIT:
printf("UVC: Streaming control: action: INIT\n");
break;
case STREAM_CONTROL_MIN:
printf("UVC: Streaming control: action: GET MIN\n");
break;
case STREAM_CONTROL_MAX:
printf("UVC: Streaming control: action: GET MAX\n");
break;
case STREAM_CONTROL_SET:
printf("UVC: Streaming control: action: SET, format: %d, frame: %d\n", iformat, iframe);
break;
}
format_first = uvc_get_frame_format_index(-1, FORMAT_INDEX_MIN);
format_last = uvc_get_frame_format_index(-1, FORMAT_INDEX_MAX);
frame_first = uvc_get_frame_format_index(-1, FRAME_INDEX_MIN);
frame_last = uvc_get_frame_format_index(-1, FRAME_INDEX_MAX);
if (action == STREAM_CONTROL_MIN) {
iformat = format_first;
iframe = frame_first;