mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-20 23:36:38 +00:00
bcf4679ab3
Original commit message from CVS: v4l plugins: * add open/close signals v4l2 plugins: * add open/close signals * move source format enumeration from v4l2element to v4l2src * adapt to the final v4l2 API in kernel 2.5 (patches for 2.4 on http://bytesex.org/patches) * small tweaks
447 lines
13 KiB
C
447 lines
13 KiB
C
/* G-Streamer Video4linux2 video-capture plugin - system calls
|
|
* Copyright (C) 2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/mman.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include "v4l2src_calls.h"
|
|
#include <sys/time.h>
|
|
|
|
#define DEBUG(format, args...) \
|
|
GST_DEBUG_ELEMENT(GST_CAT_PLUGIN_INFO, \
|
|
GST_ELEMENT(v4l2src), \
|
|
"V4L2SRC: " format, ##args)
|
|
|
|
#define MIN_BUFFERS_QUEUED 2
|
|
|
|
/* On some systems MAP_FAILED seems to be missing */
|
|
#ifndef MAP_FAILED
|
|
#define MAP_FAILED ( (caddr_t) -1 )
|
|
#endif
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2src_fill_format_list():
|
|
* create list of supported capture formats
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2src_fill_format_list (GstV4l2Src *v4l2src)
|
|
{
|
|
gint n;
|
|
|
|
DEBUG("getting src format enumerations");
|
|
|
|
/* format enumeration */
|
|
for (n=0;;n++) {
|
|
struct v4l2_fmtdesc format, *fmtptr;
|
|
format.index = n;
|
|
format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
|
|
if (ioctl(GST_V4L2ELEMENT(v4l2src)->video_fd, VIDIOC_ENUM_FMT, &format) < 0) {
|
|
if (errno == EINVAL)
|
|
break; /* end of enumeration */
|
|
else {
|
|
gst_element_error(GST_ELEMENT(v4l2src),
|
|
"Failed to get no. %d in pixelformat enumeration for %s: %s",
|
|
n, GST_V4L2ELEMENT(v4l2src)->device, g_strerror(errno));
|
|
return FALSE;
|
|
}
|
|
}
|
|
fmtptr = g_malloc(sizeof(format));
|
|
memcpy(fmtptr, &format, sizeof(format));
|
|
v4l2src->formats = g_list_append(v4l2src->formats, fmtptr);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2src_empty_format_list():
|
|
* free list of supported capture formats
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2src_empty_format_list (GstV4l2Src *v4l2src)
|
|
{
|
|
while (g_list_length(v4l2src->formats) > 0) {
|
|
gpointer data = g_list_nth_data(v4l2src->formats, 0);
|
|
v4l2src->formats = g_list_remove(v4l2src->formats, data);
|
|
g_free(data);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2src_queue_frame():
|
|
* queue a frame for capturing
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
static gboolean
|
|
gst_v4l2src_queue_frame (GstV4l2Src *v4l2src,
|
|
gint num)
|
|
{
|
|
DEBUG("queueing frame %d", num);
|
|
|
|
v4l2src->bufsettings.index = num;
|
|
if (ioctl(GST_V4L2ELEMENT(v4l2src)->video_fd, VIDIOC_QBUF, &v4l2src->bufsettings) < 0) {
|
|
gst_element_error(GST_ELEMENT(v4l2src),
|
|
"Error queueing buffer %d on device %s: %s",
|
|
num, GST_V4L2ELEMENT(v4l2src)->device, g_strerror(errno));
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4lsrc_sync_frame():
|
|
* sync on a frame for capturing
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
static gboolean
|
|
gst_v4l2src_sync_next_frame (GstV4l2Src *v4l2src,
|
|
gint *num)
|
|
{
|
|
if (ioctl(GST_V4L2ELEMENT(v4l2src)->video_fd, VIDIOC_DQBUF, &v4l2src->bufsettings) < 0) {
|
|
gst_element_error(GST_ELEMENT(v4l2src),
|
|
"Error syncing on a buffer on device %s: %s",
|
|
GST_V4L2ELEMENT(v4l2src)->device, g_strerror(errno));
|
|
return FALSE;
|
|
}
|
|
DEBUG("synced on frame %d", v4l2src->bufsettings.index);
|
|
*num = v4l2src->bufsettings.index;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2src_get_capture():
|
|
* get capture parameters
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2src_get_capture (GstV4l2Src *v4l2src)
|
|
{
|
|
DEBUG("Getting capture format");
|
|
|
|
GST_V4L2_CHECK_OPEN(GST_V4L2ELEMENT(v4l2src));
|
|
|
|
v4l2src->format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
|
|
if (ioctl(GST_V4L2ELEMENT(v4l2src)->video_fd, VIDIOC_G_FMT, &v4l2src->format) < 0) {
|
|
gst_element_error(GST_ELEMENT(v4l2src),
|
|
"Failed to get pixel format for device %s: %s",
|
|
GST_V4L2ELEMENT(v4l2src)->device, g_strerror(errno));
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2src_set_capture():
|
|
* set capture parameters
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2src_set_capture (GstV4l2Src *v4l2src,
|
|
struct v4l2_fmtdesc *fmt,
|
|
gint width,
|
|
gint height)
|
|
{
|
|
DEBUG("Setting capture format to %dx%d, format %s",
|
|
width, height, fmt->description);
|
|
|
|
GST_V4L2_CHECK_OPEN(GST_V4L2ELEMENT(v4l2src));
|
|
GST_V4L2_CHECK_NOT_ACTIVE(GST_V4L2ELEMENT(v4l2src));
|
|
|
|
memset(&v4l2src->format, 0, sizeof(struct v4l2_format));
|
|
v4l2src->format.fmt.pix.width = width;
|
|
v4l2src->format.fmt.pix.height = height;
|
|
v4l2src->format.fmt.pix.pixelformat = fmt->pixelformat;
|
|
v4l2src->format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
|
|
|
|
if (ioctl(GST_V4L2ELEMENT(v4l2src)->video_fd, VIDIOC_S_FMT, &v4l2src->format) < 0) {
|
|
gst_element_error(GST_ELEMENT(v4l2src),
|
|
"Failed to set pixel format to %s @ %dx%d for device %s: %s",
|
|
fmt->description, width, height,
|
|
GST_V4L2ELEMENT(v4l2src)->device, g_strerror(errno));
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2src_capture_init():
|
|
* initialize the capture system
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2src_capture_init (GstV4l2Src *v4l2src)
|
|
{
|
|
gint n;
|
|
gchar *desc = NULL;
|
|
|
|
DEBUG("initting the capture system");
|
|
|
|
GST_V4L2_CHECK_OPEN(GST_V4L2ELEMENT(v4l2src));
|
|
GST_V4L2_CHECK_NOT_ACTIVE(GST_V4L2ELEMENT(v4l2src));
|
|
|
|
/* request buffer info */
|
|
if (v4l2src->breq.count < MIN_BUFFERS_QUEUED)
|
|
v4l2src->breq.count = MIN_BUFFERS_QUEUED;
|
|
v4l2src->breq.type = v4l2src->format.type;
|
|
if (ioctl(GST_V4L2ELEMENT(v4l2src)->video_fd, VIDIOC_REQBUFS, &v4l2src->breq) < 0) {
|
|
gst_element_error(GST_ELEMENT(v4l2src),
|
|
"Error requesting buffers (%d) for %s: %s",
|
|
v4l2src->breq.count, GST_V4L2ELEMENT(v4l2src)->device, g_strerror(errno));
|
|
return FALSE;
|
|
}
|
|
|
|
if (v4l2src->breq.count < MIN_BUFFERS_QUEUED) {
|
|
gst_element_error(GST_ELEMENT(v4l2src),
|
|
"Too little buffers. We got %d, we want at least %d",
|
|
v4l2src->breq.count, MIN_BUFFERS_QUEUED);
|
|
return FALSE;
|
|
}
|
|
v4l2src->bufsettings.type = v4l2src->format.type;
|
|
|
|
for (n=0;n<g_list_length(v4l2src->formats);n++) {
|
|
struct v4l2_fmtdesc *fmt = (struct v4l2_fmtdesc *) g_list_nth_data(v4l2src->formats, n);
|
|
if (v4l2src->format.fmt.pix.pixelformat == fmt->pixelformat) {
|
|
desc = fmt->description;
|
|
break;
|
|
}
|
|
}
|
|
gst_info("Got %d buffers (%s) of size %d KB\n",
|
|
v4l2src->breq.count, desc, v4l2src->format.fmt.pix.sizeimage/1024);
|
|
|
|
/* Map the buffers */
|
|
GST_V4L2ELEMENT(v4l2src)->buffer = (guint8 **) g_malloc(sizeof(guint8*) * v4l2src->breq.count);
|
|
for (n=0;n<v4l2src->breq.count;n++) {
|
|
GST_V4L2ELEMENT(v4l2src)->buffer[n] = mmap(0, v4l2src->format.fmt.pix.sizeimage,
|
|
PROT_READ|PROT_WRITE, MAP_SHARED, GST_V4L2ELEMENT(v4l2src)->video_fd, v4l2src->format.fmt.pix.sizeimage*n);
|
|
if (GST_V4L2ELEMENT(v4l2src)->buffer[n] == MAP_FAILED) {
|
|
gst_element_error(GST_ELEMENT(v4l2src),
|
|
"Error mapping video buffer %d on device %s: %s",
|
|
n, GST_V4L2ELEMENT(v4l2src)->device, g_strerror(errno));
|
|
GST_V4L2ELEMENT(v4l2src)->buffer[n] = NULL;
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2src_capture_start():
|
|
* start streaming capture
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2src_capture_start (GstV4l2Src *v4l2src)
|
|
{
|
|
gint n;
|
|
|
|
DEBUG("starting the capturing");
|
|
GST_V4L2_CHECK_OPEN(GST_V4L2ELEMENT(v4l2src));
|
|
GST_V4L2_CHECK_ACTIVE(GST_V4L2ELEMENT(v4l2src));
|
|
|
|
/* queue all buffers, this starts streaming capture */
|
|
for (n=0;n<v4l2src->breq.count;n++)
|
|
if (!gst_v4l2src_queue_frame(v4l2src, n))
|
|
return FALSE;
|
|
n = 1;
|
|
if (ioctl(GST_V4L2ELEMENT(v4l2src)->video_fd, VIDIOC_STREAMON, &n) < 0) {
|
|
gst_element_error(GST_ELEMENT(v4l2src),
|
|
"Error starting streaming capture for %s: %s",
|
|
GST_V4L2ELEMENT(v4l2src)->device, g_strerror(errno));
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2src_grab_frame():
|
|
* capture one frame during streaming capture
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2src_grab_frame (GstV4l2Src *v4l2src,
|
|
gint *num)
|
|
{
|
|
DEBUG("syncing on the next frame");
|
|
|
|
GST_V4L2_CHECK_OPEN(GST_V4L2ELEMENT(v4l2src));
|
|
GST_V4L2_CHECK_ACTIVE(GST_V4L2ELEMENT(v4l2src));
|
|
|
|
/* syncing on the buffer grabs it */
|
|
if (!gst_v4l2src_sync_next_frame(v4l2src, num))
|
|
return FALSE;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2src_requeue_frame():
|
|
* re-queue a frame after we're done with the buffer
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2src_requeue_frame (GstV4l2Src *v4l2src,
|
|
gint num)
|
|
{
|
|
DEBUG("requeueing frame %d", num);
|
|
GST_V4L2_CHECK_OPEN(GST_V4L2ELEMENT(v4l2src));
|
|
GST_V4L2_CHECK_ACTIVE(GST_V4L2ELEMENT(v4l2src));
|
|
|
|
/* and let's queue the buffer */
|
|
if (!gst_v4l2src_queue_frame(v4l2src, num))
|
|
return FALSE;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2src_capture_stop():
|
|
* stop streaming capture
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2src_capture_stop (GstV4l2Src *v4l2src)
|
|
{
|
|
gint n = 0;
|
|
|
|
DEBUG("stopping capturing");
|
|
GST_V4L2_CHECK_OPEN(GST_V4L2ELEMENT(v4l2src));
|
|
GST_V4L2_CHECK_ACTIVE(GST_V4L2ELEMENT(v4l2src));
|
|
|
|
/* we actually need to sync on all queued buffers but not on the non-queued ones */
|
|
if (ioctl(GST_V4L2ELEMENT(v4l2src)->video_fd, VIDIOC_STREAMOFF, &n) < 0) {
|
|
gst_element_error(GST_ELEMENT(v4l2src),
|
|
"Error stopping streaming capture for %s: %s",
|
|
GST_V4L2ELEMENT(v4l2src)->device, g_strerror(errno));
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2src_capture_deinit():
|
|
* deinitialize the capture system
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2src_capture_deinit (GstV4l2Src *v4l2src)
|
|
{
|
|
gint n;
|
|
|
|
DEBUG("deinitting capture system");
|
|
GST_V4L2_CHECK_OPEN(GST_V4L2ELEMENT(v4l2src));
|
|
GST_V4L2_CHECK_ACTIVE(GST_V4L2ELEMENT(v4l2src));
|
|
|
|
/* unmap the buffer */
|
|
for (n=0;n<v4l2src->breq.count;n++) {
|
|
if (!GST_V4L2ELEMENT(v4l2src)->buffer[n])
|
|
break;
|
|
munmap(GST_V4L2ELEMENT(v4l2src)->buffer[n], v4l2src->format.fmt.pix.sizeimage);
|
|
GST_V4L2ELEMENT(v4l2src)->buffer[n] = NULL;
|
|
}
|
|
g_free(GST_V4L2ELEMENT(v4l2src)->buffer);
|
|
GST_V4L2ELEMENT(v4l2src)->buffer = NULL;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2src_get_fourcc_list():
|
|
* create a list of all available fourccs
|
|
* return value: the list
|
|
******************************************************/
|
|
|
|
GList *
|
|
gst_v4l2src_get_fourcc_list (GstV4l2Src *v4l2src)
|
|
{
|
|
GList *list = NULL;
|
|
gint n;
|
|
|
|
for (n=0;n<g_list_length(v4l2src->formats);n++) {
|
|
struct v4l2_fmtdesc *fmt = (struct v4l2_fmtdesc *) g_list_nth_data(v4l2src->formats, n);
|
|
guint32 print_format = GUINT32_FROM_LE(fmt->pixelformat);
|
|
gchar *print_format_str = (gchar *) &print_format;
|
|
|
|
list = g_list_append(list, g_strndup(print_format_str, 4));
|
|
}
|
|
|
|
return list;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2src_get_format_list():
|
|
* create a list of all available capture formats
|
|
* return value: the list
|
|
******************************************************/
|
|
|
|
GList *
|
|
gst_v4l2src_get_format_list (GstV4l2Src *v4l2src)
|
|
{
|
|
GList *list = NULL;
|
|
gint n;
|
|
|
|
for (n=0;n<g_list_length(v4l2src->formats);n++) {
|
|
struct v4l2_fmtdesc *fmt = (struct v4l2_fmtdesc *) g_list_nth_data(v4l2src->formats, n);
|
|
|
|
list = g_list_append(list, g_strdup(fmt->description));
|
|
}
|
|
|
|
return list;
|
|
}
|