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gstreamer/sys/v4l2/v4l2src_calls.c
Benjamin Otte 90da904f1e compatibility fix for new GST_DEBUG stuff. 
Original commit message from CVS:
compatibility fix for new GST_DEBUG stuff.
Includes fixes for missing includes for config.h and unistd.h

I only ensured for plugins I can build that they work, so if some of them are still broken, you gotta fix them yourselves unfortunately.
2003-06-29 19:46:12 +00:00

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/* 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_OBJECT (\
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
enum {
QUEUE_STATE_ERROR = -1,
QUEUE_STATE_READY_FOR_QUEUE,
QUEUE_STATE_QUEUED,
QUEUE_STATE_SYNCED,
};
/******************************************************
* 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);
v4l2src->format_list = g_list_append(v4l2src->format_list, fmtptr->description);
}
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);
}
g_list_free(v4l2src->format_list);
v4l2src->format_list = NULL;
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);
if (v4l2src->frame_queue_state[num] != QUEUE_STATE_READY_FOR_QUEUE) {
return FALSE;
}
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;
}
v4l2src->frame_queue_state[num] = QUEUE_STATE_QUEUED;
v4l2src->num_queued++;
return TRUE;
}
/******************************************************
* gst_v4l2src_sync_next_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 (v4l2src->num_queued <= 0) {
return FALSE;
}
while (ioctl(GST_V4L2ELEMENT(v4l2src)->video_fd,
VIDIOC_DQBUF, &v4l2src->bufsettings) < 0) {
/* if the sync() got interrupted, we can retry */
if (errno != EINTR) {
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("Sync got interrupted");
}
DEBUG("synced on frame %d", v4l2src->bufsettings.index);
*num = v4l2src->bufsettings.index;
v4l2src->frame_queue_state[*num] = QUEUE_STATE_SYNCED;
v4l2src->num_queued--;
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;
}
/* update internal info */
return gst_v4l2src_get_capture(v4l2src);;
}
/******************************************************
* 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;
struct v4l2_buffer buf;
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;
v4l2src->breq.memory = V4L2_MEMORY_MMAP;
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);
/* keep track of queued buffers */
v4l2src->frame_queue_state = (gint8 *)
g_malloc(sizeof(gint8) * v4l2src->breq.count);
/* track how often to use each frame */
v4l2src->use_num_times = (gint *)
g_malloc(sizeof(gint) * v4l2src->breq.count);
/* lock for the frame_state */
v4l2src->mutex_queue_state = g_mutex_new();
v4l2src->cond_queue_state = g_cond_new();
/* Map the buffers */
GST_V4L2ELEMENT(v4l2src)->buffer = (guint8 **)
g_malloc(sizeof(guint8 *) * v4l2src->breq.count);
for (n=0;n<v4l2src->breq.count;n++) {
buf.index = n;
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (ioctl(GST_V4L2ELEMENT(v4l2src)->video_fd,
VIDIOC_QUERYBUF, &buf) < 0) {
gst_element_error(GST_ELEMENT(v4l2src),
"Failed to get buffer (%d) properties: %s",
n, g_strerror(errno));
gst_v4l2src_capture_deinit(v4l2src);
return FALSE;
}
GST_V4L2ELEMENT(v4l2src)->buffer[n] = mmap(0,
buf.length, PROT_READ|PROT_WRITE, MAP_SHARED,
GST_V4L2ELEMENT(v4l2src)->video_fd, buf.m.offset);
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;
gst_v4l2src_capture_deinit(v4l2src);
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));
g_mutex_lock(v4l2src->mutex_queue_state);
v4l2src->quit = FALSE;
v4l2src->num_queued = 0;
v4l2src->queue_frame = 0;
/* set all buffers ready to queue , this starts streaming capture */
for (n=0;n<v4l2src->breq.count;n++) {
v4l2src->frame_queue_state[n] = QUEUE_STATE_READY_FOR_QUEUE;
if (!gst_v4l2src_queue_frame(v4l2src, n)) {
g_mutex_unlock(v4l2src->mutex_queue_state);
gst_v4l2src_capture_stop(v4l2src);
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;
}
g_mutex_unlock(v4l2src->mutex_queue_state);
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));
g_mutex_lock(v4l2src->mutex_queue_state);
/* do we have enough frames? */
while (v4l2src->num_queued < MIN_BUFFERS_QUEUED ||
v4l2src->frame_queue_state[v4l2src->queue_frame] ==
QUEUE_STATE_READY_FOR_QUEUE) {
while (v4l2src->frame_queue_state[v4l2src->queue_frame] !=
QUEUE_STATE_READY_FOR_QUEUE &&
!v4l2src->quit) {
GST_DEBUG (
"Waiting for frames to become available (%d < %d)",
v4l2src->num_queued, MIN_BUFFERS_QUEUED);
g_cond_wait(v4l2src->cond_queue_state,
v4l2src->mutex_queue_state);
}
if (v4l2src->quit) {
g_mutex_unlock(v4l2src->mutex_queue_state);
return TRUE; /* it won't get through anyway */
}
if (!gst_v4l2src_queue_frame(v4l2src, v4l2src->queue_frame)) {
g_mutex_unlock(v4l2src->mutex_queue_state);
return FALSE;
}
v4l2src->queue_frame = (v4l2src->queue_frame + 1) % v4l2src->breq.count;
}
/* syncing on the buffer grabs it */
if (!gst_v4l2src_sync_next_frame(v4l2src, num)) {
g_mutex_unlock(v4l2src->mutex_queue_state);
return FALSE;
}
g_mutex_unlock(v4l2src->mutex_queue_state);
return TRUE;
}
/******************************************************
*
******************************************************/
guint8 *
gst_v4l2src_get_buffer (GstV4l2Src *v4l2src,
gint num)
{
if (!GST_V4L2_IS_ACTIVE(GST_V4L2ELEMENT(v4l2src)) ||
!GST_V4L2_IS_OPEN(GST_V4L2ELEMENT(v4l2src)))
return NULL;
if (num < 0 || num >= v4l2src->breq.count)
return NULL;
return GST_V4L2ELEMENT(v4l2src)->buffer[num];
}
/******************************************************
* 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));
/* mark frame as 'ready to requeue' */
g_mutex_lock(v4l2src->mutex_queue_state);
if (v4l2src->frame_queue_state[num] != QUEUE_STATE_SYNCED) {
gst_element_error(GST_ELEMENT(v4l2src),
"Invalid state %d (expected %d), can't requeue",
v4l2src->frame_queue_state[num],
QUEUE_STATE_SYNCED);
return FALSE;
}
v4l2src->frame_queue_state[num] = QUEUE_STATE_READY_FOR_QUEUE;
/* let an optional wait know */
g_cond_broadcast(v4l2src->cond_queue_state);
g_mutex_unlock(v4l2src->mutex_queue_state);
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));
g_mutex_lock(v4l2src->mutex_queue_state);
/* 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;
}
/* make an optional pending wait stop */
v4l2src->quit = TRUE;
g_cond_broadcast(v4l2src->cond_queue_state);
/* sync on remaining frames */
while (v4l2src->num_queued > 0) {
gst_v4l2src_sync_next_frame(v4l2src, &n);
}
g_mutex_unlock(v4l2src->mutex_queue_state);
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)
{
int 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;
}
/* free buffer tracker */
g_free(GST_V4L2ELEMENT(v4l2src)->buffer);
GST_V4L2ELEMENT(v4l2src)->buffer = NULL;
g_mutex_free(v4l2src->mutex_queue_state);
g_cond_free(v4l2src->cond_queue_state);
g_free(v4l2src->frame_queue_state);
g_free(v4l2src->use_num_times);
return TRUE;
}
/*
*/
gboolean
gst_v4l2src_get_size_limits (GstV4l2Src *v4l2src,
struct v4l2_fmtdesc *format,
gint *min_w, gint *max_w,
gint *min_h, gint *max_h)
{
struct v4l2_format fmt;
/* get size delimiters */
memset(&fmt, 0, sizeof(fmt));
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = 0;
fmt.fmt.pix.height = 0;
fmt.fmt.pix.pixelformat = format->pixelformat;
fmt.fmt.pix.field = V4L2_FIELD_ANY;
if (ioctl(GST_V4L2ELEMENT(v4l2src)->video_fd,
VIDIOC_TRY_FMT, &fmt) < 0) {
return FALSE;
}
if (min_w)
*min_w = fmt.fmt.pix.width;
if (min_h)
*min_h = fmt.fmt.pix.height;
fmt.fmt.pix.width = G_MAXINT;
fmt.fmt.pix.height = G_MAXINT;
if (ioctl(GST_V4L2ELEMENT(v4l2src)->video_fd,
VIDIOC_TRY_FMT, &fmt) < 0) {
return FALSE;
}
if (max_w)
*max_w = fmt.fmt.pix.width;
if (max_h)
*max_h = fmt.fmt.pix.height;
return TRUE;
}
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