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gstreamer/sys/v4l2/v4l2src_calls.c
Stefan Kost ad5702d492 v4l2src: move duplicated timestamping and buffer metadata code to _create() 
This will include the latency changes also in the mmap case.
2009-03-25 10:08:41 +02:00

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/* GStreamer
*
* Copyright (C) 2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
* 2006 Edgard Lima <edgard.lima@indt.org.br>
*
* v4l2src.c - system calls
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#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>
#include <unistd.h>
#ifdef __sun
/* Needed on older Solaris Nevada builds (72 at least) */
#include <stropts.h>
#include <sys/ioccom.h>
#endif
#include "gstv4l2tuner.h"
GST_DEBUG_CATEGORY_EXTERN (v4l2src_debug);
#define GST_CAT_DEFAULT v4l2src_debug
/* lalala... */
#define GST_V4L2_SET_ACTIVE(element) (element)->buffer = GINT_TO_POINTER (-1)
#define GST_V4L2_SET_INACTIVE(element) (element)->buffer = NULL
/* On some systems MAP_FAILED seems to be missing */
#ifndef MAP_FAILED
#define MAP_FAILED ((caddr_t) -1)
#endif
#define GST_TYPE_V4L2_BUFFER (gst_v4l2_buffer_get_type())
#define GST_IS_V4L2_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_V4L2_BUFFER))
#define GST_V4L2_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_V4L2_BUFFER, GstV4l2Buffer))
static GstBufferClass *v4l2buffer_parent_class = NULL;
/* Local functions */
static gboolean
gst_v4l2src_get_nearest_size (GstV4l2Src * v4l2src, guint32 pixelformat,
gint * width, gint * height);
static void gst_v4l2_buffer_pool_destroy (GstV4l2BufferPool * pool);
static void
gst_v4l2_buffer_finalize (GstV4l2Buffer * buffer)
{
GstV4l2BufferPool *pool;
gboolean resuscitated = FALSE;
gint index;
pool = buffer->pool;
index = buffer->vbuffer.index;
GST_LOG ("finalizing buffer %p %d", buffer, index);
g_mutex_lock (pool->lock);
if (GST_BUFFER_SIZE (buffer) != 0)
/* BUFFER_SIZE is only set if the frame was dequeued */
pool->num_live_buffers--;
if (pool->running) {
if (v4l2_ioctl (pool->video_fd, VIDIOC_QBUF, &buffer->vbuffer) < 0) {
GST_WARNING ("could not requeue buffer %p %d", buffer, index);
} else {
/* FIXME: check that the caps didn't change */
GST_LOG ("reviving buffer %p, %d", buffer, index);
gst_buffer_ref (GST_BUFFER (buffer));
GST_BUFFER_SIZE (buffer) = 0;
pool->buffers[index] = buffer;
resuscitated = TRUE;
}
} else {
GST_LOG ("the pool is shutting down");
}
g_mutex_unlock (pool->lock);
if (!resuscitated) {
GST_LOG ("buffer %p not recovered, unmapping", buffer);
gst_mini_object_unref (GST_MINI_OBJECT (pool));
v4l2_munmap ((void *) GST_BUFFER_DATA (buffer), buffer->vbuffer.length);
GST_MINI_OBJECT_CLASS (v4l2buffer_parent_class)->finalize (GST_MINI_OBJECT
(buffer));
}
}
static void
gst_v4l2_buffer_class_init (gpointer g_class, gpointer class_data)
{
GstMiniObjectClass *mini_object_class = GST_MINI_OBJECT_CLASS (g_class);
v4l2buffer_parent_class = g_type_class_peek_parent (g_class);
mini_object_class->finalize = (GstMiniObjectFinalizeFunction)
gst_v4l2_buffer_finalize;
}
static GType
gst_v4l2_buffer_get_type (void)
{
static GType _gst_v4l2_buffer_type;
if (G_UNLIKELY (_gst_v4l2_buffer_type == 0)) {
static const GTypeInfo v4l2_buffer_info = {
sizeof (GstBufferClass),
NULL,
NULL,
gst_v4l2_buffer_class_init,
NULL,
NULL,
sizeof (GstV4l2Buffer),
0,
NULL,
NULL
};
_gst_v4l2_buffer_type = g_type_register_static (GST_TYPE_BUFFER,
"GstV4l2Buffer", &v4l2_buffer_info, 0);
}
return _gst_v4l2_buffer_type;
}
static GstV4l2Buffer *
gst_v4l2_buffer_new (GstV4l2BufferPool * pool, guint index, GstCaps * caps)
{
GstV4l2Buffer *ret;
guint8 *data;
ret = (GstV4l2Buffer *) gst_mini_object_new (GST_TYPE_V4L2_BUFFER);
GST_LOG ("creating buffer %u, %p in pool %p", index, ret, pool);
ret->pool =
(GstV4l2BufferPool *) gst_mini_object_ref (GST_MINI_OBJECT (pool));
ret->vbuffer.index = index;
ret->vbuffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ret->vbuffer.memory = V4L2_MEMORY_MMAP;
if (v4l2_ioctl (pool->video_fd, VIDIOC_QUERYBUF, &ret->vbuffer) < 0)
goto querybuf_failed;
GST_LOG (" index: %u", ret->vbuffer.index);
GST_LOG (" type: %d", ret->vbuffer.type);
GST_LOG (" bytesused: %u", ret->vbuffer.bytesused);
GST_LOG (" flags: %08x", ret->vbuffer.flags);
GST_LOG (" field: %d", ret->vbuffer.field);
GST_LOG (" memory: %d", ret->vbuffer.memory);
if (ret->vbuffer.memory == V4L2_MEMORY_MMAP)
GST_LOG (" MMAP offset: %u", ret->vbuffer.m.offset);
GST_LOG (" length: %u", ret->vbuffer.length);
GST_LOG (" input: %u", ret->vbuffer.input);
data = (guint8 *) v4l2_mmap (0, ret->vbuffer.length,
PROT_READ | PROT_WRITE, MAP_SHARED, pool->video_fd,
ret->vbuffer.m.offset);
if (data == MAP_FAILED)
goto mmap_failed;
GST_BUFFER_DATA (ret) = data;
GST_BUFFER_SIZE (ret) = ret->vbuffer.length;
GST_BUFFER_FLAG_SET (ret, GST_BUFFER_FLAG_READONLY);
gst_buffer_set_caps (GST_BUFFER (ret), caps);
return ret;
/* ERRORS */
querybuf_failed:
{
gint errnosave = errno;
GST_WARNING ("Failed QUERYBUF: %s", g_strerror (errnosave));
gst_buffer_unref (GST_BUFFER (ret));
errno = errnosave;
return NULL;
}
mmap_failed:
{
gint errnosave = errno;
GST_WARNING ("Failed to mmap: %s", g_strerror (errnosave));
gst_buffer_unref (GST_BUFFER (ret));
errno = errnosave;
return NULL;
}
}
#define GST_TYPE_V4L2_BUFFER_POOL (gst_v4l2_buffer_pool_get_type())
#define GST_IS_V4L2_BUFFER_POOL(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_V4L2_BUFFER_POOL))
#define GST_V4L2_BUFFER_POOL(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_V4L2_BUFFER_POOL, GstV4l2BufferPool))
static GstMiniObjectClass *buffer_pool_parent_class = NULL;
static void
gst_v4l2_buffer_pool_finalize (GstV4l2BufferPool * pool)
{
g_mutex_free (pool->lock);
pool->lock = NULL;
if (pool->video_fd >= 0)
v4l2_close (pool->video_fd);
if (pool->buffers) {
g_free (pool->buffers);
pool->buffers = NULL;
}
GST_MINI_OBJECT_CLASS (buffer_pool_parent_class)->finalize (GST_MINI_OBJECT
(pool));
}
static void
gst_v4l2_buffer_pool_init (GstV4l2BufferPool * pool, gpointer g_class)
{
pool->lock = g_mutex_new ();
pool->running = FALSE;
pool->num_live_buffers = 0;
}
static void
gst_v4l2_buffer_pool_class_init (gpointer g_class, gpointer class_data)
{
GstMiniObjectClass *mini_object_class = GST_MINI_OBJECT_CLASS (g_class);
buffer_pool_parent_class = g_type_class_peek_parent (g_class);
mini_object_class->finalize = (GstMiniObjectFinalizeFunction)
gst_v4l2_buffer_pool_finalize;
}
static GType
gst_v4l2_buffer_pool_get_type (void)
{
static GType _gst_v4l2_buffer_pool_type;
if (G_UNLIKELY (_gst_v4l2_buffer_pool_type == 0)) {
static const GTypeInfo v4l2_buffer_pool_info = {
sizeof (GstBufferClass),
NULL,
NULL,
gst_v4l2_buffer_pool_class_init,
NULL,
NULL,
sizeof (GstV4l2BufferPool),
0,
(GInstanceInitFunc) gst_v4l2_buffer_pool_init,
NULL
};
_gst_v4l2_buffer_pool_type = g_type_register_static (GST_TYPE_MINI_OBJECT,
"GstV4l2BufferPool", &v4l2_buffer_pool_info, 0);
}
return _gst_v4l2_buffer_pool_type;
}
static GstV4l2BufferPool *
gst_v4l2_buffer_pool_new (GstV4l2Src * v4l2src, gint fd, gint num_buffers,
GstCaps * caps)
{
GstV4l2BufferPool *pool;
gint n;
pool = (GstV4l2BufferPool *) gst_mini_object_new (GST_TYPE_V4L2_BUFFER_POOL);
pool->video_fd = v4l2_dup (fd);
if (pool->video_fd < 0)
goto dup_failed;
pool->buffer_count = num_buffers;
pool->buffers = g_new0 (GstV4l2Buffer *, num_buffers);
for (n = 0; n < num_buffers; n++) {
pool->buffers[n] = gst_v4l2_buffer_new (pool, n, caps);
if (!pool->buffers[n])
goto buffer_new_failed;
}
return pool;
/* ERRORS */
dup_failed:
{
gint errnosave = errno;
gst_mini_object_unref (GST_MINI_OBJECT (pool));
errno = errnosave;
return NULL;
}
buffer_new_failed:
{
gint errnosave = errno;
gst_v4l2_buffer_pool_destroy (pool);
errno = errnosave;
return NULL;
}
}
static gboolean
gst_v4l2_buffer_pool_activate (GstV4l2BufferPool * pool, GstV4l2Src * v4l2src)
{
gint n;
g_mutex_lock (pool->lock);
for (n = 0; n < pool->buffer_count; n++) {
struct v4l2_buffer *buf;
buf = &pool->buffers[n]->vbuffer;
GST_LOG ("enqueue pool buffer %d", n);
if (v4l2_ioctl (pool->video_fd, VIDIOC_QBUF, buf) < 0)
goto queue_failed;
}
pool->running = TRUE;
g_mutex_unlock (pool->lock);
return TRUE;
/* ERRORS */
queue_failed:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
(_("Could not enqueue buffers in device '%s'."),
v4l2src->v4l2object->videodev),
("enqueing buffer %d/%d failed: %s",
n, v4l2src->num_buffers, g_strerror (errno)));
g_mutex_unlock (pool->lock);
return FALSE;
}
}
static void
gst_v4l2_buffer_pool_destroy (GstV4l2BufferPool * pool)
{
gint n;
g_mutex_lock (pool->lock);
pool->running = FALSE;
g_mutex_unlock (pool->lock);
GST_DEBUG ("destroy pool");
/* after this point, no more buffers will be queued or dequeued; no buffer
* from pool->buffers that is NULL will be set to a buffer, and no buffer that
* is not NULL will be pushed out. */
/* miniobjects have no dispose, so they can't break ref-cycles, as buffers ref
* the pool, we need to unref the buffer to properly finalize te pool */
for (n = 0; n < pool->buffer_count; n++) {
GstBuffer *buf;
g_mutex_lock (pool->lock);
buf = GST_BUFFER (pool->buffers[n]);
g_mutex_unlock (pool->lock);
if (buf)
/* we own the ref if the buffer is in pool->buffers; drop it. */
gst_buffer_unref (buf);
}
gst_mini_object_unref (GST_MINI_OBJECT (pool));
}
/* complete made up ranking, the values themselves are meaningless */
#define YUV_BASE_RANK 1000
#define JPEG_BASE_RANK 500
#define DV_BASE_RANK 200
#define RGB_BASE_RANK 100
#define YUV_ODD_BASE_RANK 50
#define RGB_ODD_BASE_RANK 25
#define BAYER_BASE_RANK 15
#define S910_BASE_RANK 10
#define GREY_BASE_RANK 5
#define PWC_BASE_RANK 1
static gint
gst_v4l2src_format_get_rank (guint32 fourcc)
{
switch (fourcc) {
case V4L2_PIX_FMT_MJPEG:
return JPEG_BASE_RANK;
case V4L2_PIX_FMT_JPEG:
return JPEG_BASE_RANK + 1;
case V4L2_PIX_FMT_RGB332:
case V4L2_PIX_FMT_RGB555:
case V4L2_PIX_FMT_RGB555X:
case V4L2_PIX_FMT_RGB565:
case V4L2_PIX_FMT_RGB565X:
return RGB_ODD_BASE_RANK;
case V4L2_PIX_FMT_RGB24:
case V4L2_PIX_FMT_BGR24:
return RGB_BASE_RANK - 1;
case V4L2_PIX_FMT_RGB32:
case V4L2_PIX_FMT_BGR32:
return RGB_BASE_RANK;
case V4L2_PIX_FMT_GREY: /* 8 Greyscale */
return GREY_BASE_RANK;
case V4L2_PIX_FMT_NV12: /* 12 Y/CbCr 4:2:0 */
case V4L2_PIX_FMT_NV21: /* 12 Y/CrCb 4:2:0 */
case V4L2_PIX_FMT_YYUV: /* 16 YUV 4:2:2 */
case V4L2_PIX_FMT_HI240: /* 8 8-bit color */
return YUV_ODD_BASE_RANK;
case V4L2_PIX_FMT_YVU410: /* YVU9, 9 bits per pixel */
return YUV_BASE_RANK + 3;
case V4L2_PIX_FMT_YUV410: /* YUV9, 9 bits per pixel */
return YUV_BASE_RANK + 2;
case V4L2_PIX_FMT_YUV420: /* I420, 12 bits per pixel */
return YUV_BASE_RANK + 7;
case V4L2_PIX_FMT_YUYV: /* YUY2, 16 bits per pixel */
return YUV_BASE_RANK + 10;
case V4L2_PIX_FMT_YVU420: /* YV12, 12 bits per pixel */
return YUV_BASE_RANK + 6;
case V4L2_PIX_FMT_UYVY: /* UYVY, 16 bits per pixel */
return YUV_BASE_RANK + 9;
case V4L2_PIX_FMT_Y41P: /* Y41P, 12 bits per pixel */
return YUV_BASE_RANK + 5;
case V4L2_PIX_FMT_YUV411P: /* Y41B, 12 bits per pixel */
return YUV_BASE_RANK + 4;
case V4L2_PIX_FMT_YUV422P: /* Y42B, 16 bits per pixel */
return YUV_BASE_RANK + 8;
case V4L2_PIX_FMT_DV:
return DV_BASE_RANK;
case V4L2_PIX_FMT_MPEG: /* MPEG */
case V4L2_PIX_FMT_WNVA: /* Winnov hw compres */
return 0;
#ifdef V4L2_PIX_FMT_SBGGR8
case V4L2_PIX_FMT_SBGGR8:
return BAYER_BASE_RANK;
#endif
#ifdef V4L2_PIX_FMT_SN9C10X
case V4L2_PIX_FMT_SN9C10X:
return S910_BASE_RANK;
#endif
#ifdef V4L2_PIX_FMT_PWC1
case V4L2_PIX_FMT_PWC1:
return PWC_BASE_RANK;
#endif
#ifdef V4L2_PIX_FMT_PWC2
case V4L2_PIX_FMT_PWC2:
return PWC_BASE_RANK;
#endif
default:
break;
}
return 0;
}
static gint
gst_v4l2src_format_cmp_func (gconstpointer a, gconstpointer b)
{
guint32 pf1 = ((struct v4l2_fmtdesc *) a)->pixelformat;
guint32 pf2 = ((struct v4l2_fmtdesc *) b)->pixelformat;
if (pf1 == pf2)
return 0;
return gst_v4l2src_format_get_rank (pf2) - gst_v4l2src_format_get_rank (pf1);
}
/******************************************************
* 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;
struct v4l2_fmtdesc *format;
GST_DEBUG_OBJECT (v4l2src, "getting src format enumerations");
/* format enumeration */
for (n = 0;; n++) {
format = g_new0 (struct v4l2_fmtdesc, 1);
format->index = n;
format->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (v4l2_ioctl (v4l2src->v4l2object->video_fd, VIDIOC_ENUM_FMT, format) < 0) {
if (errno == EINVAL) {
g_free (format);
break; /* end of enumeration */
} else {
goto failed;
}
}
GST_LOG_OBJECT (v4l2src, "index: %u", format->index);
GST_LOG_OBJECT (v4l2src, "type: %d", format->type);
GST_LOG_OBJECT (v4l2src, "flags: %08x", format->flags);
GST_LOG_OBJECT (v4l2src, "description: '%s'", format->description);
GST_LOG_OBJECT (v4l2src, "pixelformat: %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (format->pixelformat));
/* sort formats according to our preference; we do this, because caps
* are probed in the order the formats are in the list, and the order of
* formats in the final probed caps matters for things like fixation */
v4l2src->formats = g_slist_insert_sorted (v4l2src->formats, format,
(GCompareFunc) gst_v4l2src_format_cmp_func);
}
GST_DEBUG_OBJECT (v4l2src, "got %d format(s)", n);
return TRUE;
/* ERRORS */
failed:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
(_("Failed to enumerate possible video formats device '%s' can work with"), v4l2src->v4l2object->videodev), ("Failed to get number %d in pixelformat enumeration for %s. (%d - %s)", n, v4l2src->v4l2object->videodev, errno, g_strerror (errno)));
g_free (format);
return FALSE;
}
}
/******************************************************
* gst_v4l2src_clear_format_list():
* free list of supported capture formats
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2src_clear_format_list (GstV4l2Src * v4l2src)
{
g_slist_foreach (v4l2src->formats, (GFunc) g_free, NULL);
g_slist_free (v4l2src->formats);
v4l2src->formats = NULL;
return TRUE;
}
/* The frame interval enumeration code first appeared in Linux 2.6.19. */
#ifdef VIDIOC_ENUM_FRAMEINTERVALS
static GstStructure *
gst_v4l2src_probe_caps_for_format_and_size (GstV4l2Src * v4l2src,
guint32 pixelformat,
guint32 width, guint32 height, const GstStructure * template)
{
gint fd = v4l2src->v4l2object->video_fd;
struct v4l2_frmivalenum ival;
guint32 num, denom;
GstStructure *s;
GValue rates = { 0, };
memset (&ival, 0, sizeof (struct v4l2_frmivalenum));
ival.index = 0;
ival.pixel_format = pixelformat;
ival.width = width;
ival.height = height;
GST_LOG_OBJECT (v4l2src, "get frame interval for %ux%u, %" GST_FOURCC_FORMAT,
width, height, GST_FOURCC_ARGS (pixelformat));
/* keep in mind that v4l2 gives us frame intervals (durations); we invert the
* fraction to get framerate */
if (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) < 0)
goto enum_frameintervals_failed;
if (ival.type == V4L2_FRMIVAL_TYPE_DISCRETE) {
GValue rate = { 0, };
g_value_init (&rates, GST_TYPE_LIST);
g_value_init (&rate, GST_TYPE_FRACTION);
do {
num = ival.discrete.numerator;
denom = ival.discrete.denominator;
if (num > G_MAXINT || denom > G_MAXINT) {
/* let us hope we don't get here... */
num >>= 1;
denom >>= 1;
}
GST_LOG_OBJECT (v4l2src, "adding discrete framerate: %d/%d", denom, num);
/* swap to get the framerate */
gst_value_set_fraction (&rate, denom, num);
gst_value_list_append_value (&rates, &rate);
ival.index++;
} while (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) >= 0);
} else if (ival.type == V4L2_FRMIVAL_TYPE_STEPWISE) {
GValue min = { 0, };
GValue step = { 0, };
GValue max = { 0, };
gboolean added = FALSE;
guint32 minnum, mindenom;
guint32 maxnum, maxdenom;
g_value_init (&rates, GST_TYPE_LIST);
g_value_init (&min, GST_TYPE_FRACTION);
g_value_init (&step, GST_TYPE_FRACTION);
g_value_init (&max, GST_TYPE_FRACTION);
/* get the min */
minnum = ival.stepwise.min.numerator;
mindenom = ival.stepwise.min.denominator;
if (minnum > G_MAXINT || mindenom > G_MAXINT) {
minnum >>= 1;
mindenom >>= 1;
}
GST_LOG_OBJECT (v4l2src, "stepwise min frame interval: %d/%d", minnum,
mindenom);
gst_value_set_fraction (&min, minnum, mindenom);
/* get the max */
maxnum = ival.stepwise.max.numerator;
maxdenom = ival.stepwise.max.denominator;
if (maxnum > G_MAXINT || maxdenom > G_MAXINT) {
maxnum >>= 1;
maxdenom >>= 1;
}
GST_LOG_OBJECT (v4l2src, "stepwise max frame interval: %d/%d", maxnum,
maxdenom);
gst_value_set_fraction (&max, maxnum, maxdenom);
/* get the step */
num = ival.stepwise.step.numerator;
denom = ival.stepwise.step.denominator;
if (num > G_MAXINT || denom > G_MAXINT) {
num >>= 1;
denom >>= 1;
}
if (num == 0 || denom == 0) {
/* in this case we have a wrong fraction or no step, set the step to max
* so that we only add the min value in the loop below */
num = maxnum;
denom = maxdenom;
}
/* since we only have gst_value_fraction_subtract and not add, negate the
* numerator */
GST_LOG_OBJECT (v4l2src, "stepwise step frame interval: %d/%d", num, denom);
gst_value_set_fraction (&step, -num, denom);
while (gst_value_compare (&min, &max) <= 0) {
GValue rate = { 0, };
num = gst_value_get_fraction_numerator (&min);
denom = gst_value_get_fraction_denominator (&min);
GST_LOG_OBJECT (v4l2src, "adding stepwise framerate: %d/%d", denom, num);
/* invert to get the framerate */
g_value_init (&rate, GST_TYPE_FRACTION);
gst_value_set_fraction (&rate, denom, num);
gst_value_list_append_value (&rates, &rate);
added = TRUE;
/* we're actually adding because step was negated above. This is because
* there is no _add function... */
if (!gst_value_fraction_subtract (&min, &min, &step)) {
GST_WARNING_OBJECT (v4l2src, "could not step fraction!");
break;
}
}
if (!added) {
/* no range was added, leave the default range from the template */
GST_WARNING_OBJECT (v4l2src, "no range added, leaving default");
g_value_unset (&rates);
}
} else if (ival.type == V4L2_FRMIVAL_TYPE_CONTINUOUS) {
guint32 maxnum, maxdenom;
g_value_init (&rates, GST_TYPE_FRACTION_RANGE);
num = ival.stepwise.min.numerator;
denom = ival.stepwise.min.denominator;
if (num > G_MAXINT || denom > G_MAXINT) {
num >>= 1;
denom >>= 1;
}
maxnum = ival.stepwise.max.numerator;
maxdenom = ival.stepwise.max.denominator;
if (maxnum > G_MAXINT || maxdenom > G_MAXINT) {
maxnum >>= 1;
maxdenom >>= 1;
}
GST_LOG_OBJECT (v4l2src, "continuous frame interval %d/%d to %d/%d",
maxdenom, maxnum, denom, num);
gst_value_set_fraction_range_full (&rates, maxdenom, maxnum, denom, num);
} else {
goto unknown_type;
}
return_data:
s = gst_structure_copy (template);
gst_structure_set (s, "width", G_TYPE_INT, (gint) width,
"height", G_TYPE_INT, (gint) height, NULL);
if (G_IS_VALUE (&rates)) {
/* only change the framerate on the template when we have a valid probed new
* value */
gst_structure_set_value (s, "framerate", &rates);
g_value_unset (&rates);
} else {
gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 100, 1,
NULL);
}
return s;
/* ERRORS */
enum_frameintervals_failed:
{
GST_DEBUG_OBJECT (v4l2src,
"Unable to enumerate intervals for %" GST_FOURCC_FORMAT "@%ux%u",
GST_FOURCC_ARGS (pixelformat), width, height);
goto return_data;
}
unknown_type:
{
/* I don't see how this is actually an error, we ignore the format then */
GST_WARNING_OBJECT (v4l2src,
"Unknown frame interval type at %" GST_FOURCC_FORMAT "@%ux%u: %u",
GST_FOURCC_ARGS (pixelformat), width, height, ival.type);
return NULL;
}
}
#endif /* defined VIDIOC_ENUM_FRAMEINTERVALS */
#ifdef VIDIOC_ENUM_FRAMESIZES
static gint
sort_by_frame_size (GstStructure * s1, GstStructure * s2)
{
int w1, h1, w2, h2;
gst_structure_get_int (s1, "width", &w1);
gst_structure_get_int (s1, "height", &h1);
gst_structure_get_int (s2, "width", &w2);
gst_structure_get_int (s2, "height", &h2);
/* I think it's safe to assume that this won't overflow for a while */
return ((w2 * h2) - (w1 * h1));
}
#endif
GstCaps *
gst_v4l2src_probe_caps_for_format (GstV4l2Src * v4l2src, guint32 pixelformat,
const GstStructure * template)
{
GstCaps *ret = gst_caps_new_empty ();
GstStructure *tmp;
#ifdef VIDIOC_ENUM_FRAMESIZES
gint fd = v4l2src->v4l2object->video_fd;
struct v4l2_frmsizeenum size;
GList *results = NULL;
guint32 w, h;
memset (&size, 0, sizeof (struct v4l2_frmsizeenum));
size.index = 0;
size.pixel_format = pixelformat;
GST_DEBUG_OBJECT (v4l2src, "Enumerating frame sizes");
if (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) < 0)
goto enum_framesizes_failed;
if (size.type == V4L2_FRMSIZE_TYPE_DISCRETE) {
do {
GST_LOG_OBJECT (v4l2src, "got discrete frame size %dx%d",
size.discrete.width, size.discrete.height);
w = MIN (size.discrete.width, G_MAXINT);
h = MIN (size.discrete.height, G_MAXINT);
if (w && h) {
tmp = gst_v4l2src_probe_caps_for_format_and_size (v4l2src, pixelformat,
w, h, template);
if (tmp)
results = g_list_prepend (results, tmp);
}
size.index++;
} while (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) >= 0);
GST_DEBUG_OBJECT (v4l2src, "done iterating discrete frame sizes");
} else if (size.type == V4L2_FRMSIZE_TYPE_STEPWISE) {
GST_DEBUG_OBJECT (v4l2src, "we have stepwise frame sizes:");
GST_DEBUG_OBJECT (v4l2src, "min width: %d", size.stepwise.min_width);
GST_DEBUG_OBJECT (v4l2src, "min height: %d", size.stepwise.min_height);
GST_DEBUG_OBJECT (v4l2src, "max width: %d", size.stepwise.max_width);
GST_DEBUG_OBJECT (v4l2src, "min height: %d", size.stepwise.max_height);
GST_DEBUG_OBJECT (v4l2src, "step width: %d", size.stepwise.step_width);
GST_DEBUG_OBJECT (v4l2src, "step height: %d", size.stepwise.step_height);
for (w = size.stepwise.min_width, h = size.stepwise.min_height;
w < size.stepwise.max_width && h < size.stepwise.max_height;
w += size.stepwise.step_width, h += size.stepwise.step_height) {
if (w == 0 || h == 0)
continue;
tmp = gst_v4l2src_probe_caps_for_format_and_size (v4l2src, pixelformat,
w, h, template);
if (tmp)
results = g_list_prepend (results, tmp);
}
GST_DEBUG_OBJECT (v4l2src, "done iterating stepwise frame sizes");
} else if (size.type == V4L2_FRMSIZE_TYPE_CONTINUOUS) {
guint32 maxw, maxh;
GST_DEBUG_OBJECT (v4l2src, "we have continuous frame sizes:");
GST_DEBUG_OBJECT (v4l2src, "min width: %d", size.stepwise.min_width);
GST_DEBUG_OBJECT (v4l2src, "min height: %d", size.stepwise.min_height);
GST_DEBUG_OBJECT (v4l2src, "max width: %d", size.stepwise.max_width);
GST_DEBUG_OBJECT (v4l2src, "min height: %d", size.stepwise.max_height);
w = MAX (size.stepwise.min_width, 1);
h = MAX (size.stepwise.min_height, 1);
maxw = MIN (size.stepwise.max_width, G_MAXINT);
maxh = MIN (size.stepwise.max_height, G_MAXINT);
tmp = gst_v4l2src_probe_caps_for_format_and_size (v4l2src, pixelformat,
w, h, template);
if (tmp) {
gst_structure_set (tmp, "width", GST_TYPE_INT_RANGE, (gint) w,
(gint) maxw, "height", GST_TYPE_INT_RANGE, (gint) h, (gint) maxh,
NULL);
/* no point using the results list here, since there's only one struct */
gst_caps_append_structure (ret, tmp);
}
} else {
goto unknown_type;
}
/* we use an intermediary list to store and then sort the results of the
* probing because we can't make any assumptions about the order in which
* the driver will give us the sizes, but we want the final caps to contain
* the results starting with the highest resolution and having the lowest
* resolution last, since order in caps matters for things like fixation. */
results = g_list_sort (results, (GCompareFunc) sort_by_frame_size);
while (results != NULL) {
gst_caps_append_structure (ret, GST_STRUCTURE (results->data));
results = g_list_delete_link (results, results);
}
if (gst_caps_is_empty (ret))
goto enum_framesizes_no_results;
return ret;
/* ERRORS */
enum_framesizes_failed:
{
/* I don't see how this is actually an error */
GST_DEBUG_OBJECT (v4l2src,
"Failed to enumerate frame sizes for pixelformat %" GST_FOURCC_FORMAT
" (%s)", GST_FOURCC_ARGS (pixelformat), g_strerror (errno));
goto default_frame_sizes;
}
enum_framesizes_no_results:
{
/* it's possible that VIDIOC_ENUM_FRAMESIZES is defined but the driver in
* question doesn't actually support it yet */
GST_DEBUG_OBJECT (v4l2src, "No results for pixelformat %" GST_FOURCC_FORMAT
" enumerating frame sizes, trying fallback",
GST_FOURCC_ARGS (pixelformat));
goto default_frame_sizes;
}
unknown_type:
{
GST_WARNING_OBJECT (v4l2src,
"Unknown frame sizeenum type for pixelformat %" GST_FOURCC_FORMAT
": %u", GST_FOURCC_ARGS (pixelformat), size.type);
goto default_frame_sizes;
}
default_frame_sizes:
#endif /* defined VIDIOC_ENUM_FRAMESIZES */
{
gint min_w, max_w, min_h, max_h, fix_num = 0, fix_denom = 0;
/* This code is for Linux < 2.6.19 */
min_w = min_h = 1;
max_w = max_h = GST_V4L2_MAX_SIZE;
if (!gst_v4l2src_get_nearest_size (v4l2src, pixelformat, &min_w, &min_h)) {
GST_WARNING_OBJECT (v4l2src,
"Could not probe minimum capture size for pixelformat %"
GST_FOURCC_FORMAT, GST_FOURCC_ARGS (pixelformat));
}
if (!gst_v4l2src_get_nearest_size (v4l2src, pixelformat, &max_w, &max_h)) {
GST_WARNING_OBJECT (v4l2src,
"Could not probe maximum capture size for pixelformat %"
GST_FOURCC_FORMAT, GST_FOURCC_ARGS (pixelformat));
}
/* Since we can't get framerate directly, try to use the current norm */
if (v4l2src->v4l2object->norm && v4l2src->v4l2object->norms) {
GList *norms;
GstTunerNorm *norm;
for (norms = v4l2src->v4l2object->norms; norms != NULL;
norms = norms->next) {
norm = (GstTunerNorm *) norms->data;
if (!strcmp (norm->label, v4l2src->v4l2object->norm))
break;
}
/* If it's possible, set framerate to that (discrete) value */
if (norm) {
fix_num = gst_value_get_fraction_numerator (&norm->framerate);
fix_denom = gst_value_get_fraction_denominator (&norm->framerate);
}
}
tmp = gst_structure_copy (template);
if (fix_num) {
gst_structure_set (tmp,
"width", GST_TYPE_INT_RANGE, min_w, max_w,
"height", GST_TYPE_INT_RANGE, min_h, max_h,
"framerate", GST_TYPE_FRACTION, fix_num, fix_denom, NULL);
} else {
/* if norm can't be used, copy the template framerate */
gst_structure_set (tmp,
"width", GST_TYPE_INT_RANGE, min_w, max_w,
"height", GST_TYPE_INT_RANGE, min_h, max_h,
"framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 100, 1, NULL);
}
gst_caps_append_structure (ret, tmp);
return ret;
}
}
/******************************************************
* gst_v4l2src_grab_frame ():
* grab a frame for capturing
* return value: GST_FLOW_OK, GST_FLOW_WRONG_STATE or GST_FLOW_ERROR
******************************************************/
GstFlowReturn
gst_v4l2src_grab_frame (GstV4l2Src * v4l2src, GstBuffer ** buf)
{
#define NUM_TRIALS 50
struct v4l2_buffer buffer;
gint32 trials = NUM_TRIALS;
GstBuffer *pool_buffer;
gboolean need_copy;
gint index;
gint ret;
memset (&buffer, 0x00, sizeof (buffer));
buffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buffer.memory = V4L2_MEMORY_MMAP;
for (;;) {
ret = gst_poll_wait (v4l2src->v4l2object->poll, GST_CLOCK_TIME_NONE);
if (G_UNLIKELY (ret < 0)) {
if (errno == EBUSY)
goto stopped;
if (errno != EAGAIN && errno != EINTR)
goto select_error;
}
if (v4l2_ioctl (v4l2src->v4l2object->video_fd, VIDIOC_DQBUF, &buffer) >= 0)
break;
GST_WARNING_OBJECT (v4l2src,
"problem grabbing frame %d (ix=%d), trials=%d, pool-ct=%d, buf.flags=%d",
buffer.sequence, buffer.index, trials,
GST_MINI_OBJECT_REFCOUNT (v4l2src->pool), buffer.flags);
/* if the sync() got interrupted, we can retry */
switch (errno) {
case EAGAIN:
GST_WARNING_OBJECT (v4l2src,
"Non-blocking I/O has been selected using O_NONBLOCK and"
" no buffer was in the outgoing queue. device %s",
v4l2src->v4l2object->videodev);
break;
case EINVAL:
goto einval;
case ENOMEM:
goto enomem;
case EIO:
GST_INFO_OBJECT (v4l2src,
"VIDIOC_DQBUF failed due to an internal error."
" Can also indicate temporary problems like signal loss."
" Note the driver might dequeue an (empty) buffer despite"
" returning an error, or even stop capturing."
" device %s", v4l2src->v4l2object->videodev);
/* have we de-queued a buffer ? */
if (!(buffer.flags & (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE))) {
/* this fails
if ((buffer.index >= 0) && (buffer.index < v4l2src->breq.count)) {
GST_DEBUG_OBJECT (v4l2src, "reenqueing buffer (ix=%ld)", buffer.index);
gst_v4l2src_queue_frame (v4l2src, buffer.index);
}
else {
*/
GST_DEBUG_OBJECT (v4l2src, "reenqueing buffer");
/* FIXME: this is not a good idea, as drivers usualy return the buffer
* with index-number set to 0, thus the re-enque will fail unless it
* was incidentialy 0.
* We could try to re-enque all buffers without handling the ioctl
* return.
*/
/*
if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_QBUF, &buffer) < 0) {
goto qbuf_failed;
}
*/
/*} */
}
break;
case EINTR:
GST_WARNING_OBJECT (v4l2src,
"could not sync on a buffer on device %s",
v4l2src->v4l2object->videodev);
break;
default:
GST_WARNING_OBJECT (v4l2src,
"Grabbing frame got interrupted on %s unexpectedly. %d: %s.",
v4l2src->v4l2object->videodev, errno, g_strerror (errno));
break;
}
/* check nr. of attempts to capture */
if (--trials == -1) {
goto too_many_trials;
} else {
memset (&buffer, 0x00, sizeof (buffer));
buffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buffer.memory = V4L2_MEMORY_MMAP;
}
}
g_mutex_lock (v4l2src->pool->lock);
index = buffer.index;
/* get our GstBuffer with that index from the pool, if the buffer was
* outstanding we have a serious problem. */
pool_buffer = GST_BUFFER (v4l2src->pool->buffers[index]);
if (pool_buffer == NULL)
goto no_buffer;
GST_LOG_OBJECT (v4l2src, "grabbed buffer %p at index %d", pool_buffer, index);
/* we have the buffer now, mark the spot in the pool empty */
v4l2src->pool->buffers[index] = NULL;
v4l2src->pool->num_live_buffers++;
/* if we are handing out the last buffer in the pool, we need to make a
* copy and bring the buffer back in the pool. */
need_copy = v4l2src->always_copy
|| (v4l2src->pool->num_live_buffers == v4l2src->pool->buffer_count);
g_mutex_unlock (v4l2src->pool->lock);
/* this can change at every frame, esp. with jpeg */
GST_BUFFER_SIZE (pool_buffer) = buffer.bytesused;
if (G_UNLIKELY (need_copy)) {
*buf = gst_buffer_copy (pool_buffer);
GST_BUFFER_FLAG_UNSET (*buf, GST_BUFFER_FLAG_READONLY);
/* this will requeue */
gst_buffer_unref (pool_buffer);
} else {
*buf = pool_buffer;
}
/* we set the buffer metadata in gst_v4l2src_create() */
GST_LOG_OBJECT (v4l2src, "grabbed frame %d (ix=%d), flags %08x, pool-ct=%d",
buffer.sequence, buffer.index, buffer.flags,
v4l2src->pool->num_live_buffers);
return GST_FLOW_OK;
/* ERRORS */
select_error:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ, (NULL),
("select error %d: %s (%d)", ret, g_strerror (errno), errno));
return GST_FLOW_ERROR;
}
stopped:
{
GST_DEBUG ("stop called");
return GST_FLOW_WRONG_STATE;
}
einval:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, FAILED,
(_("Failed trying to get video frames from device '%s'."),
v4l2src->v4l2object->videodev),
(_("The buffer type is not supported, or the index is out of bounds,"
" or no buffers have been allocated yet, or the userptr"
" or length are invalid. device %s"),
v4l2src->v4l2object->videodev));
return GST_FLOW_ERROR;
}
enomem:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, FAILED,
(_("Failed trying to get video frames from device '%s'. Not enough memory."), v4l2src->v4l2object->videodev), (_("insufficient memory to enqueue a user pointer buffer. device %s."), v4l2src->v4l2object->videodev));
return GST_FLOW_ERROR;
}
too_many_trials:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, FAILED,
(_("Failed trying to get video frames from device '%s'."),
v4l2src->v4l2object->videodev),
(_("Failed after %d tries. device %s. system error: %s"),
NUM_TRIALS, v4l2src->v4l2object->videodev, g_strerror (errno)));
return GST_FLOW_ERROR;
}
no_buffer:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, FAILED,
(_("Failed trying to get video frames from device '%s'."),
v4l2src->v4l2object->videodev),
(_("No free buffers found in the pool at index %d."), index));
g_mutex_unlock (v4l2src->pool->lock);
return GST_FLOW_ERROR;
}
/*
qbuf_failed:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, WRITE,
(_("Could not exchange data with device '%s'."),
v4l2src->v4l2object->videodev),
("Error queueing buffer on device %s. system error: %s",
v4l2src->v4l2object->videodev, g_strerror (errno)));
return GST_FLOW_ERROR;
}
*/
}
/* Note about fraction simplification
* n1/d1 == n2/d2 is also written as n1 == ( n2 * d1 ) / d2
*/
#define fractions_are_equal(n1,d1,n2,d2) ((n1) == gst_util_uint64_scale_int((n2), (d1), (d2)))
/******************************************************
* gst_v4l2src_set_capture():
* set capture parameters
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2src_set_capture (GstV4l2Src * v4l2src, guint32 pixelformat,
guint32 width, guint32 height, guint fps_n, guint fps_d)
{
gint fd = v4l2src->v4l2object->video_fd;
struct v4l2_format format;
struct v4l2_streamparm stream;
GST_DEBUG_OBJECT (v4l2src, "Setting capture format to %dx%d, format "
"%" GST_FOURCC_FORMAT, width, height, GST_FOURCC_ARGS (pixelformat));
GST_V4L2_CHECK_OPEN (v4l2src->v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2src->v4l2object);
memset (&format, 0x00, sizeof (struct v4l2_format));
format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (v4l2_ioctl (fd, VIDIOC_G_FMT, &format) < 0)
goto get_fmt_failed;
format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
format.fmt.pix.width = width;
format.fmt.pix.height = height;
format.fmt.pix.pixelformat = pixelformat;
/* request whole frames; change when gstreamer supports interlaced video
* (INTERLACED mode returns frames where the fields have already been
* combined, there are other modes for requesting fields individually) */
format.fmt.pix.field = V4L2_FIELD_INTERLACED;
if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0) {
if (errno != EINVAL)
goto set_fmt_failed;
/* try again with progressive video */
format.fmt.pix.width = width;
format.fmt.pix.height = height;
format.fmt.pix.pixelformat = pixelformat;
format.fmt.pix.field = V4L2_FIELD_NONE;
if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0)
goto set_fmt_failed;
}
if (format.fmt.pix.width != width || format.fmt.pix.height != height)
goto invalid_dimensions;
if (format.fmt.pix.pixelformat != pixelformat)
goto invalid_pixelformat;
/* Is there a reason we require the caller to always specify a framerate? */
GST_LOG_OBJECT (v4l2src, "Desired framerate: %u/%u", fps_n, fps_d);
memset (&stream, 0x00, sizeof (struct v4l2_streamparm));
stream.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (v4l2_ioctl (fd, VIDIOC_G_PARM, &stream) < 0) {
GST_ELEMENT_WARNING (v4l2src, RESOURCE, SETTINGS,
(_("Could not get parameters on device '%s'"),
v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
goto done;
}
/* Note: V4L2 provides the frame interval, we have the frame rate */
if (fractions_are_equal (stream.parm.capture.timeperframe.numerator,
stream.parm.capture.timeperframe.denominator, fps_d, fps_n)) {
GST_LOG_OBJECT (v4l2src, "Desired framerate already set");
v4l2src->fps_n = fps_n;
v4l2src->fps_d = fps_d;
goto done;
}
/* We want to change the frame rate, so check whether we can. Some cheap USB
* cameras don't have the capability */
if ((stream.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) == 0) {
GST_DEBUG_OBJECT (v4l2src, "Not setting framerate (not supported)");
goto done;
}
GST_LOG_OBJECT (v4l2src, "Setting framerate to %u/%u", fps_n, fps_d);
/* Note: V4L2 wants the frame interval, we have the frame rate */
stream.parm.capture.timeperframe.numerator = fps_d;
stream.parm.capture.timeperframe.denominator = fps_n;
/* some cheap USB cam's won't accept any change */
if (v4l2_ioctl (fd, VIDIOC_S_PARM, &stream) < 0) {
GST_ELEMENT_WARNING (v4l2src, RESOURCE, SETTINGS,
(_("Video input device did not accept new frame rate setting.")),
GST_ERROR_SYSTEM);
goto done;
}
v4l2src->fps_n = fps_n;
v4l2src->fps_d = fps_d;
GST_INFO_OBJECT (v4l2src, "Set framerate to %u/%u", fps_n, fps_d);
done:
return TRUE;
/* ERRORS */
get_fmt_failed:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
(_("Device '%s' does not support video capture"),
v4l2src->v4l2object->videodev),
("Call to G_FMT failed: (%s)", g_strerror (errno)));
return FALSE;
}
set_fmt_failed:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
(_("Device '%s' cannot capture at %dx%d"),
v4l2src->v4l2object->videodev, width, height),
("Call to S_FMT failed for %" GST_FOURCC_FORMAT " @ %dx%d: %s",
GST_FOURCC_ARGS (pixelformat), width, height, g_strerror (errno)));
return FALSE;
}
invalid_dimensions:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
(_("Device '%s' cannot capture at %dx%d"),
v4l2src->v4l2object->videodev, width, height),
("Tried to capture at %dx%d, but device returned size %dx%d",
width, height, format.fmt.pix.width, format.fmt.pix.height));
return FALSE;
}
invalid_pixelformat:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
(_("Device '%s' cannot capture in the specified format"),
v4l2src->v4l2object->videodev),
("Tried to capture in %" GST_FOURCC_FORMAT
", but device returned format" " %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (pixelformat),
GST_FOURCC_ARGS (format.fmt.pix.pixelformat)));
return FALSE;
}
}
/******************************************************
* gst_v4l2src_capture_init():
* initialize the capture system
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2src_capture_init (GstV4l2Src * v4l2src, GstCaps * caps)
{
gint fd = v4l2src->v4l2object->video_fd;
struct v4l2_requestbuffers breq;
memset (&breq, 0, sizeof (struct v4l2_requestbuffers));
GST_DEBUG_OBJECT (v4l2src, "initializing the capture system");
GST_V4L2_CHECK_OPEN (v4l2src->v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2src->v4l2object);
if (v4l2src->v4l2object->vcap.capabilities & V4L2_CAP_STREAMING) {
GST_DEBUG_OBJECT (v4l2src, "STREAMING, requesting %d MMAP CAPTURE buffers",
v4l2src->num_buffers);
breq.count = v4l2src->num_buffers;
breq.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
breq.memory = V4L2_MEMORY_MMAP;
if (v4l2_ioctl (fd, VIDIOC_REQBUFS, &breq) < 0)
goto reqbufs_failed;
GST_LOG_OBJECT (v4l2src, " count: %u", breq.count);
GST_LOG_OBJECT (v4l2src, " type: %d", breq.type);
GST_LOG_OBJECT (v4l2src, " memory: %d", breq.memory);
if (breq.count < GST_V4L2_MIN_BUFFERS)
goto no_buffers;
if (v4l2src->num_buffers != breq.count) {
GST_WARNING_OBJECT (v4l2src, "using %u buffers instead", breq.count);
v4l2src->num_buffers = breq.count;
g_object_notify (G_OBJECT (v4l2src), "queue-size");
}
/* Map the buffers */
GST_LOG_OBJECT (v4l2src, "initiating buffer pool");
if (!(v4l2src->pool = gst_v4l2_buffer_pool_new (v4l2src, fd,
v4l2src->num_buffers, caps)))
goto buffer_pool_new_failed;
GST_INFO_OBJECT (v4l2src, "capturing buffers via mmap()");
v4l2src->use_mmap = TRUE;
} else if (v4l2src->v4l2object->vcap.capabilities & V4L2_CAP_READWRITE) {
GST_INFO_OBJECT (v4l2src, "capturing buffers via read()");
v4l2src->use_mmap = FALSE;
v4l2src->pool = NULL;
} else {
goto no_supported_capture_method;
}
GST_V4L2_SET_ACTIVE (v4l2src->v4l2object);
return TRUE;
/* ERRORS */
reqbufs_failed:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
(_("Could not get buffers from device '%s'."),
v4l2src->v4l2object->videodev),
("error requesting %d buffers: %s",
v4l2src->num_buffers, g_strerror (errno)));
return FALSE;
}
no_buffers:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
(_("Could not get enough buffers from device '%s'."),
v4l2src->v4l2object->videodev),
("we received %d from device '%s', we want at least %d",
breq.count, v4l2src->v4l2object->videodev, GST_V4L2_MIN_BUFFERS));
return FALSE;
}
buffer_pool_new_failed:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
(_("Could not map buffers from device '%s'"),
v4l2src->v4l2object->videodev),
("Failed to create buffer pool: %s", g_strerror (errno)));
return FALSE;
}
no_supported_capture_method:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
(_("The driver of device '%s' does not support any known capture "
"method."), v4l2src->v4l2object->videodev), (NULL));
return FALSE;
}
}
/******************************************************
* gst_v4l2src_capture_start():
* start streaming capture
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2src_capture_start (GstV4l2Src * v4l2src)
{
gint type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
gint fd = v4l2src->v4l2object->video_fd;
GST_DEBUG_OBJECT (v4l2src, "starting the capturing");
//GST_V4L2_CHECK_OPEN (v4l2src->v4l2object);
GST_V4L2_CHECK_ACTIVE (v4l2src->v4l2object);
v4l2src->quit = FALSE;
if (v4l2src->use_mmap) {
if (!gst_v4l2_buffer_pool_activate (v4l2src->pool, v4l2src))
goto pool_activate_failed;
if (v4l2_ioctl (fd, VIDIOC_STREAMON, &type) < 0)
goto streamon_failed;
}
v4l2src->is_capturing = TRUE;
return TRUE;
/* ERRORS */
pool_activate_failed:
{
/* already errored */
return FALSE;
}
streamon_failed:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, OPEN_READ,
(_("Error starting streaming capture from device '%s'."),
v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
}
/******************************************************
* gst_v4l2src_capture_stop():
* stop streaming capture
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2src_capture_stop (GstV4l2Src * v4l2src)
{
gint type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
GST_DEBUG_OBJECT (v4l2src, "stopping capturing");
if (!GST_V4L2_IS_OPEN (v4l2src->v4l2object)) {
goto done;
}
if (!GST_V4L2_IS_ACTIVE (v4l2src->v4l2object)) {
goto done;
}
if (v4l2src->use_mmap) {
/* we actually need to sync on all queued buffers but not
* on the non-queued ones */
if (v4l2_ioctl (v4l2src->v4l2object->video_fd, VIDIOC_STREAMOFF, &type) < 0)
goto streamoff_failed;
}
done:
/* make an optional pending wait stop */
v4l2src->quit = TRUE;
v4l2src->is_capturing = FALSE;
return TRUE;
/* ERRORS */
streamoff_failed:
{
GST_ELEMENT_ERROR (v4l2src, RESOURCE, CLOSE,
(_("Error stopping streaming capture from device '%s'."),
v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
}
/******************************************************
* gst_v4l2src_capture_deinit():
* deinitialize the capture system
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2src_capture_deinit (GstV4l2Src * v4l2src)
{
GST_DEBUG_OBJECT (v4l2src, "deinitting capture system");
if (!GST_V4L2_IS_OPEN (v4l2src->v4l2object)) {
return TRUE;
}
if (!GST_V4L2_IS_ACTIVE (v4l2src->v4l2object)) {
return TRUE;
}
if (v4l2src->pool) {
gst_v4l2_buffer_pool_destroy (v4l2src->pool);
v4l2src->pool = NULL;
}
GST_V4L2_SET_INACTIVE (v4l2src->v4l2object);
return TRUE;
}
/*
*/
static gboolean
gst_v4l2src_get_nearest_size (GstV4l2Src * v4l2src, guint32 pixelformat,
gint * width, gint * height)
{
struct v4l2_format fmt;
int fd;
int r;
g_return_val_if_fail (width != NULL, FALSE);
g_return_val_if_fail (height != NULL, FALSE);
GST_LOG_OBJECT (v4l2src,
"getting nearest size to %dx%d with format %" GST_FOURCC_FORMAT,
*width, *height, GST_FOURCC_ARGS (pixelformat));
fd = v4l2src->v4l2object->video_fd;
/* get size delimiters */
memset (&fmt, 0, sizeof (fmt));
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = *width;
fmt.fmt.pix.height = *height;
fmt.fmt.pix.pixelformat = pixelformat;
fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
r = v4l2_ioctl (fd, VIDIOC_TRY_FMT, &fmt);
if (r < 0 && errno == EINVAL) {
/* try again with progressive video */
fmt.fmt.pix.width = *width;
fmt.fmt.pix.height = *height;
fmt.fmt.pix.pixelformat = pixelformat;
fmt.fmt.pix.field = V4L2_FIELD_NONE;
r = v4l2_ioctl (fd, VIDIOC_TRY_FMT, &fmt);
}
if (r < 0) {
/* The driver might not implement TRY_FMT, in which case we will try
S_FMT to probe */
if (errno != ENOTTY)
return FALSE;
/* Only try S_FMT if we're not actively capturing yet, which we shouldn't
be, because we're still probing */
if (GST_V4L2_IS_ACTIVE (v4l2src->v4l2object))
return FALSE;
GST_LOG_OBJECT (v4l2src,
"Failed to probe size limit with VIDIOC_TRY_FMT, trying VIDIOC_S_FMT");
fmt.fmt.pix.width = *width;
fmt.fmt.pix.height = *height;
r = v4l2_ioctl (fd, VIDIOC_S_FMT, &fmt);
if (r < 0 && errno == EINVAL) {
/* try again with progressive video */
fmt.fmt.pix.width = *width;
fmt.fmt.pix.height = *height;
fmt.fmt.pix.pixelformat = pixelformat;
fmt.fmt.pix.field = V4L2_FIELD_NONE;
r = v4l2_ioctl (fd, VIDIOC_S_FMT, &fmt);
}
if (r < 0)
return FALSE;
}
GST_LOG_OBJECT (v4l2src,
"got nearest size %dx%d", fmt.fmt.pix.width, fmt.fmt.pix.height);
*width = fmt.fmt.pix.width;
*height = fmt.fmt.pix.height;
return TRUE;
}
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