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gstreamer/sys/v4l2/v4l2src_calls.c
Edgard Lima 1759dfcbed Fix GST_BUFFER_DURATION. 
Original commit message from CVS:
Fix GST_BUFFER_DURATION.
2006-09-18 15:36:14 +00:00

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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>
#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
#define DEBUG(format, args...) \
GST_CAT_DEBUG_OBJECT (\
v4l2src_debug, v4l2src, \
"V4L2SRC: " format, ##args)
/* 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;
struct v4l2_fmtdesc *format;
GST_DEBUG_OBJECT (v4l2src, "getting src format enumerations");
/* format enumeration */
for (n = 0;; n++) {
format = g_new (struct v4l2_fmtdesc, 1);
format->index = n;
format->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_ENUM_FMT, format) < 0) {
if (errno == EINVAL) {
break; /* end of enumeration */
} else {
GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
(_("failed to get number %d in pixelformat enumeration for %s: %s"),
n, v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
g_free (format);
return FALSE;
}
}
GST_LOG_OBJECT (v4l2src, "got format %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (format->pixelformat));
v4l2src->formats = g_slist_prepend (v4l2src->formats, format);
}
return TRUE;
}
/******************************************************
* 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;
}
/******************************************************
* gst_v4l2src_queue_frame():
* queue a frame for capturing
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2src_queue_frame (GstV4l2Src * v4l2src, guint i)
{
GST_LOG_OBJECT (v4l2src, "queueing frame %u", i);
if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_QBUF,
&v4l2src->pool->buffers[i].buffer) < 0) {
GST_ELEMENT_ERROR (v4l2src, RESOURCE, WRITE,
(_("Could not write to device '%s'."),
v4l2src->v4l2object->videodev),
("Error queueing buffer %u on device %s. system error: %s", i,
v4l2src->v4l2object->videodev, g_strerror (errno)));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l2src_grab_frame ():
* grab a frame for capturing
* return value: TRUE on success, FALSE on error
******************************************************/
gint
gst_v4l2src_grab_frame (GstV4l2Src * v4l2src)
{
struct v4l2_buffer buffer;
gint32 trials = 100;
memset (&buffer, 0x00, sizeof (buffer));
buffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buffer.memory = v4l2src->breq.memory;
while (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_DQBUF, &buffer) < 0) {
/* if the sync() got interrupted, we can retry */
switch (errno) {
case EAGAIN:
GST_DEBUG_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:
GST_ELEMENT_ERROR (v4l2src, RESOURCE, FAILED,
(_("Failed trying to get 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));
break;
case ENOMEM:
GST_ELEMENT_ERROR (v4l2src, RESOURCE, FAILED,
(_("Failed trying to get frames from device %s. Not enough memory"),
v4l2src->v4l2object->videodev),
(_("isufficient memory to enqueue a user pointer buffer. device %s"), v4l2src->v4l2object->videodev));
break;
case EIO:
GST_DEBUG_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);
break;
case EINTR:
GST_DEBUG_OBJECT (v4l2src,
"could not sync on a buffer on device %s",
v4l2src->v4l2object->videodev);
break;
default:
GST_ELEMENT_WARNING (v4l2src, RESOURCE, FAILED,
(_("Grabbing frame got interrupted on %s. No expected reason"),
v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
break;
}
if (--trials == -1) {
return -1;
} else {
ioctl (v4l2src->v4l2object->video_fd, VIDIOC_QBUF, &buffer);
memset (&buffer, 0x00, sizeof (buffer));
buffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buffer.memory = v4l2src->breq.memory;
}
}
GST_LOG_OBJECT (v4l2src, "grabbed frame %d", buffer.index);
return buffer.index;
}
/******************************************************
* 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 (v4l2src->v4l2object);
memset (&v4l2src->format, 0, sizeof (struct v4l2_format));
v4l2src->format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_G_FMT, &v4l2src->format) < 0) {
GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
(_("failed to get pixelformat for device %s"),
v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
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,
guint * fps_n, guint * fps_d)
{
guint new_fps_n = *fps_n;
guint new_fps_d = *fps_d;
DEBUG ("Setting capture format to %dx%d, format %s",
*width, *height, fmt->description);
GST_V4L2_CHECK_OPEN (v4l2src->v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2src->v4l2object);
if (!gst_v4l2src_get_capture (v4l2src)) {
goto fail;
}
v4l2src->format.fmt.pix.width = *width;
v4l2src->format.fmt.pix.height = *height;
v4l2src->format.fmt.pix.pixelformat = fmt->pixelformat;
v4l2src->format.fmt.pix.field = V4L2_FIELD_INTERLACED;
v4l2src->format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_S_FMT, &v4l2src->format) < 0) {
GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
(_("failed to set pixelformat to %s @ %dx%d for device %s: %s"),
fmt->description, *width, *height, v4l2src->v4l2object->videodev),
GST_ERROR_SYSTEM);
goto fail;
}
if (*width != v4l2src->format.fmt.pix.width ||
*height != v4l2src->format.fmt.pix.height) {
DEBUG ("Updating size from %dx%d to %dx%d, format %s",
*width, *height, v4l2src->format.fmt.pix.width,
v4l2src->format.fmt.pix.height, fmt->description);
}
/* update internal info */
if (!gst_v4l2src_get_capture (v4l2src)) {
goto fail;
}
if (fmt->pixelformat != v4l2src->format.fmt.pix.pixelformat) {
GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
(_("failed to set pixelformat to %s @ %dx%d for device %s: %s"),
fmt->description, *width, *height, v4l2src->v4l2object->videodev),
GST_ERROR_SYSTEM);
goto fail;
}
if (*fps_n) {
if (gst_v4l2src_set_fps (v4l2src, &new_fps_n, &new_fps_d)) {
if (new_fps_n != *fps_n || new_fps_d != *fps_d) {
DEBUG ("Updating framerate from %u/%u to %u%u",
*fps_n, *fps_d, new_fps_n, new_fps_d);
*fps_n = new_fps_n;
*fps_d = new_fps_d;
}
}
} else {
if (gst_v4l2src_get_fps (v4l2src, &new_fps_n, &new_fps_d)) {
DEBUG ("framerate is %u/%u", new_fps_n, new_fps_d);
*fps_n = new_fps_n;
*fps_d = new_fps_d;
}
}
*width = v4l2src->format.fmt.pix.width;
*height = v4l2src->format.fmt.pix.height;
return TRUE;
fail:
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)
{
gint n;
guint buffers;
GST_DEBUG_OBJECT (v4l2src, "initting the capture system");
GST_V4L2_CHECK_OPEN (v4l2src->v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2src->v4l2object);
/* request buffer info */
buffers = v4l2src->breq.count;
if (v4l2src->breq.count > GST_V4L2_MAX_BUFFERS) {
v4l2src->breq.count = GST_V4L2_MAX_BUFFERS;
}
if (v4l2src->breq.count < GST_V4L2_MIN_BUFFERS) {
v4l2src->breq.count = GST_V4L2_MIN_BUFFERS;
}
v4l2src->breq.type = v4l2src->format.type;
if (v4l2src->v4l2object->vcap.capabilities & V4L2_CAP_STREAMING) {
v4l2src->breq.memory = V4L2_MEMORY_MMAP;
if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_REQBUFS,
&v4l2src->breq) < 0) {
GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
(_("Could not get buffers from device '%s'."),
v4l2src->v4l2object->videodev),
("error requesting %d buffers. system error: %s",
v4l2src->breq.count, g_strerror (errno)));
return FALSE;
}
GST_LOG_OBJECT (v4l2src, "using default mmap method");
} else if (v4l2src->v4l2object->vcap.capabilities & V4L2_CAP_READWRITE) {
v4l2src->breq.memory = 0;
GST_INFO_OBJECT (v4l2src, "using fallback read method");
} else {
GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
(_("the driver of device '%s' is broken."),
v4l2src->v4l2object->videodev),
("no supported read capability from %s",
v4l2src->v4l2object->videodev));
return FALSE;
}
/* Determine the device's framerate */
if (!gst_v4l2src_update_fps (v4l2src->v4l2object)) {
GST_DEBUG_OBJECT (v4l2src, "frame rate is unknown.");
v4l2src->fps_d = 1;
v4l2src->fps_n = 0;
}
if (v4l2src->breq.memory > 0) {
if (v4l2src->breq.count < GST_V4L2_MIN_BUFFERS) {
GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
(_("Could not get enough buffers from device '%s'."),
v4l2src->v4l2object->videodev),
("we received %d, we want at least %d",
v4l2src->breq.count, GST_V4L2_MIN_BUFFERS));
v4l2src->breq.count = buffers;
return FALSE;
}
if (v4l2src->breq.count != buffers)
g_object_notify (G_OBJECT (v4l2src), "num_buffers");
GST_INFO_OBJECT (v4l2src,
"Got %d buffers (%" GST_FOURCC_FORMAT ") of size %d KB",
v4l2src->breq.count,
GST_FOURCC_ARGS (v4l2src->format.fmt.pix.pixelformat),
v4l2src->format.fmt.pix.sizeimage / 1024);
/* Map the buffers */
GST_LOG_OBJECT (v4l2src, "initiating buffer pool");
v4l2src->pool = g_new (GstV4l2BufferPool, 1);
gst_atomic_int_set (&v4l2src->pool->refcount, 1);
v4l2src->pool->video_fd = v4l2src->v4l2object->video_fd;
v4l2src->pool->buffer_count = v4l2src->breq.count;
v4l2src->pool->buffers = g_new0 (GstV4l2Buffer, v4l2src->breq.count);
for (n = 0; n < v4l2src->breq.count; n++) {
GstV4l2Buffer *buffer = &v4l2src->pool->buffers[n];
gst_atomic_int_set (&buffer->refcount, 1);
buffer->pool = v4l2src->pool;
memset (&buffer->buffer, 0x00, sizeof (buffer->buffer));
buffer->buffer.index = n;
buffer->buffer.type = v4l2src->breq.type;
buffer->buffer.memory = v4l2src->breq.memory;
if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_QUERYBUF,
&buffer->buffer) < 0) {
GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
(_("Could not get buffer properties of buffer %d"), n),
GST_ERROR_SYSTEM);
gst_v4l2src_capture_deinit (v4l2src);
return FALSE;
}
buffer->start =
mmap (0, buffer->buffer.length, PROT_READ | PROT_WRITE, MAP_SHARED,
v4l2src->v4l2object->video_fd, buffer->buffer.m.offset);
if (buffer->start == MAP_FAILED) {
GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
(_("Could not mmap video buffer %d: %s"), n), GST_ERROR_SYSTEM);
buffer->start = 0;
gst_v4l2src_capture_deinit (v4l2src);
return FALSE;
}
buffer->length = buffer->buffer.length;
if (!gst_v4l2src_queue_frame (v4l2src, n)) {
gst_v4l2src_capture_deinit (v4l2src);
return FALSE;
}
}
} else {
GST_LOG_OBJECT (v4l2src, "no buffer pool used");
v4l2src->pool = NULL;
}
GST_V4L2_SET_ACTIVE (v4l2src->v4l2object);
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 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
GST_DEBUG_OBJECT (v4l2src, "starting the capturing");
GST_V4L2_CHECK_OPEN (v4l2src->v4l2object);
if (!GST_V4L2_IS_ACTIVE (v4l2src->v4l2object)) {
/* gst_pad_renegotiate (v4l2src->srcpad); FIX: is it still required in 0.10 */
}
GST_V4L2_CHECK_ACTIVE (v4l2src->v4l2object);
v4l2src->quit = FALSE;
if (v4l2src->breq.memory != 0) {
if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_STREAMON, &type) < 0) {
GST_ELEMENT_ERROR (v4l2src, RESOURCE, OPEN_READ,
(_("Error starting streaming capture from device %s"),
v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
}
v4l2src->is_capturing = TRUE;
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 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
GST_DEBUG_OBJECT (v4l2src, "stopping capturing");
GST_V4L2_CHECK_OPEN (v4l2src->v4l2object);
GST_V4L2_CHECK_ACTIVE (v4l2src->v4l2object);
if (v4l2src->breq.memory != 0) {
/* we actually need to sync on all queued buffers but not
* on the non-queued ones */
if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_STREAMOFF, &type) < 0) {
GST_ELEMENT_ERROR (v4l2src, RESOURCE, CLOSE,
(_("Error stopping streaming capture from device %s: %s"),
v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
}
/* make an optional pending wait stop */
v4l2src->quit = TRUE;
v4l2src->is_capturing = FALSE;
return TRUE;
}
static void
gst_v4l2src_buffer_pool_free (GstV4l2BufferPool * pool, gboolean do_close)
{
guint i;
for (i = 0; i < pool->buffer_count; i++) {
gst_atomic_int_set (&pool->buffers[i].refcount, 0);
munmap (pool->buffers[i].start, pool->buffers[i].length);
}
g_free (pool->buffers);
gst_atomic_int_set (&pool->refcount, 0);
if (do_close)
close (pool->video_fd);
g_free (pool);
}
#if 0
void
gst_v4l2src_free_buffer (GstBuffer * buffer)
{
GstV4l2Buffer *buf = (GstV4l2Buffer *) GST_BUFFER_PRIVATE (buffer);
GST_LOG ("freeing buffer %p (nr. %d)", buffer, buf->buffer.index);
if (!g_atomic_int_dec_and_test (&buf->refcount)) {
/* we're still in use, add to queue again
note: this might fail because the device is already stopped (race) */
if (ioctl (buf->pool->video_fd, VIDIOC_QBUF, &buf->buffer) < 0)
GST_INFO ("readding to queue failed, assuming video device is stopped");
}
if (g_atomic_int_dec_and_test (&buf->pool->refcount)) {
/* we're last thing that used all this */
gst_v4l2src_buffer_pool_free (buf->pool, TRUE);
}
}
#endif
/******************************************************
* gst_v4l2src_capture_deinit():
* deinitialize the capture system
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2src_capture_deinit (GstV4l2Src * v4l2src)
{
gint i;
gboolean try_reinit = FALSE;
GST_DEBUG_OBJECT (v4l2src, "deinitting capture system");
GST_V4L2_CHECK_OPEN (v4l2src->v4l2object);
GST_V4L2_CHECK_ACTIVE (v4l2src->v4l2object);
if (v4l2src->pool) {
/* free the buffers */
for (i = 0; i < v4l2src->breq.count; i++) {
if (g_atomic_int_dec_and_test (&v4l2src->pool->buffers[i].refcount)) {
if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_DQBUF,
&v4l2src->pool->buffers[i].buffer) < 0)
GST_DEBUG_OBJECT (v4l2src,
"Could not dequeue buffer on uninitialization."
"system error: %s. Will try reinit instead", g_strerror (errno));
try_reinit = TRUE;
}
}
if (g_atomic_int_dec_and_test (&v4l2src->pool->refcount)) {
/* we're last thing that used all this */
gst_v4l2src_buffer_pool_free (v4l2src->pool, FALSE);
}
v4l2src->pool = NULL;
/* This is our second try to get the buffers dequeued.
* Since buffers are normally dequeued automatically when capturing is
* stopped, but may be enqueued before capturing has started, you get
* a problem when you abort before capturing started but have enqueued
* the buffers. We avoid that by starting/stopping capturing once so
* they get auto-dequeued.
*/
if (try_reinit) {
if (!gst_v4l2src_capture_start (v4l2src) ||
!gst_v4l2src_capture_stop (v4l2src))
return FALSE;
}
}
GST_V4L2_SET_INACTIVE (v4l2src->v4l2object);
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;
GST_LOG_OBJECT (v4l2src,
"getting size limits with format %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (format->pixelformat));
/* 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_INTERLACED;
if (ioctl (v4l2src->v4l2object->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;
GST_LOG_OBJECT (v4l2src,
"got min size %dx%d", fmt.fmt.pix.width, fmt.fmt.pix.height);
fmt.fmt.pix.width = 4096;
fmt.fmt.pix.height = 4096;
if (ioctl (v4l2src->v4l2object->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;
GST_LOG_OBJECT (v4l2src,
"got max size %dx%d", fmt.fmt.pix.width, fmt.fmt.pix.height);
return TRUE;
}
gboolean
gst_v4l2src_update_fps (GstV4l2Object * v4l2object)
{
GstV4l2Src *v4l2src = GST_V4L2SRC (v4l2object->element);
return gst_v4l2src_get_fps (v4l2src, &v4l2src->fps_n, &v4l2src->fps_d);
}
gboolean
gst_v4l2src_set_fps (GstV4l2Src * v4l2src, guint * fps_n, guint * fps_d)
{
GstV4l2Object *v4l2object = v4l2src->v4l2object;
struct v4l2_streamparm stream;
memset (&stream, 0x00, sizeof (struct v4l2_streamparm));
stream.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (ioctl (v4l2object->video_fd, VIDIOC_G_PARM, &stream) == 0 &&
stream.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) {
stream.parm.capture.timeperframe.denominator = *fps_n;
stream.parm.capture.timeperframe.numerator = *fps_d;
if (ioctl (v4l2object->video_fd, VIDIOC_S_PARM, &stream) == 0) {
*fps_n = stream.parm.capture.timeperframe.denominator;
*fps_d = stream.parm.capture.timeperframe.numerator;
return TRUE;
}
}
return FALSE;
}
gboolean
gst_v4l2src_get_fps (GstV4l2Src * v4l2src, guint * fps_n, guint * fps_d)
{
GstV4l2Object *v4l2object = v4l2src->v4l2object;
v4l2_std_id std;
struct v4l2_streamparm stream;
const GList *item;
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
/* Try to get the frame rate directly from the device using VIDIOC_G_PARM */
memset (&stream, 0x00, sizeof (struct v4l2_streamparm));
stream.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (ioctl (v4l2object->video_fd, VIDIOC_G_PARM, &stream) == 0 &&
stream.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) {
/* Note: V4L2 gives us the frame interval, we need the frame rate */
*fps_n = stream.parm.capture.timeperframe.denominator;
*fps_d = stream.parm.capture.timeperframe.numerator;
GST_DEBUG_OBJECT (v4l2src,
"frame rate returned by G_PARM: %d/%d fps", *fps_n, *fps_d);
return TRUE;
}
/* If G_PARM failed, try to get the same information from the video standard */
if (!gst_v4l2_get_norm (v4l2object, &std))
return FALSE;
for (item = v4l2object->stds; item != NULL; item = item->next) {
GstV4l2TunerNorm *v4l2norm = item->data;
if (v4l2norm->index == std) {
*fps_n =
gst_value_get_fraction_numerator (&GST_TUNER_NORM (v4l2norm)->
framerate);
*fps_d =
gst_value_get_fraction_denominator (&GST_TUNER_NORM (v4l2norm)->
framerate);
GST_DEBUG_OBJECT (v4l2src,
"frame rate returned by get_norm: %d/%d fps", *fps_n, *fps_d);
return TRUE;
}
}
return FALSE;
}
#define GST_TYPE_V4L2SRC_BUFFER (gst_v4l2src_buffer_get_type())
#define GST_IS_V4L2SRC_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_V4L2SRC_BUFFER))
#define GST_V4L2SRC_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_V4L2SRC_BUFFER, GstV4l2SrcBuffer))
typedef struct _GstV4l2SrcBuffer
{
GstBuffer buffer;
GstV4l2Buffer *buf;
} GstV4l2SrcBuffer;
static void gst_v4l2src_buffer_class_init (gpointer g_class,
gpointer class_data);
static void gst_v4l2src_buffer_init (GTypeInstance * instance,
gpointer g_class);
static void gst_v4l2src_buffer_finalize (GstV4l2SrcBuffer * v4l2src_buffer);
GType
gst_v4l2src_buffer_get_type (void)
{
static GType _gst_v4l2src_buffer_type;
if (G_UNLIKELY (_gst_v4l2src_buffer_type == 0)) {
static const GTypeInfo v4l2src_buffer_info = {
sizeof (GstBufferClass),
NULL,
NULL,
gst_v4l2src_buffer_class_init,
NULL,
NULL,
sizeof (GstV4l2SrcBuffer),
0,
gst_v4l2src_buffer_init,
NULL
};
_gst_v4l2src_buffer_type = g_type_register_static (GST_TYPE_BUFFER,
"GstV4l2SrcBuffer", &v4l2src_buffer_info, 0);
}
return _gst_v4l2src_buffer_type;
}
static void
gst_v4l2src_buffer_class_init (gpointer g_class, gpointer class_data)
{
GstMiniObjectClass *mini_object_class = GST_MINI_OBJECT_CLASS (g_class);
mini_object_class->finalize = (GstMiniObjectFinalizeFunction)
gst_v4l2src_buffer_finalize;
}
static void
gst_v4l2src_buffer_init (GTypeInstance * instance, gpointer g_class)
{
}
static void
gst_v4l2src_buffer_finalize (GstV4l2SrcBuffer * v4l2src_buffer)
{
GstV4l2Buffer *buf = v4l2src_buffer->buf;
if (buf) {
GST_LOG ("freeing buffer %p (nr. %d)", buf, buf->buffer.index);
if (!g_atomic_int_dec_and_test (&buf->refcount)) {
/* we're still in use, add to queue again
note: this might fail because the device is already stopped (race) */
if (ioctl (buf->pool->video_fd, VIDIOC_QBUF, &buf->buffer) < 0)
GST_INFO ("readding to queue failed, assuming video device is stopped");
}
if (g_atomic_int_dec_and_test (&buf->pool->refcount)) {
/* we're last thing that used all this */
gst_v4l2src_buffer_pool_free (buf->pool, TRUE);
}
}
}
/* Create a V4l2Src buffer from our mmap'd data area */
GstBuffer *
gst_v4l2src_buffer_new (GstV4l2Src * v4l2src, guint size, guint8 * data,
GstV4l2Buffer * srcbuf)
{
GstBuffer *buf;
if (data == NULL) {
buf = gst_buffer_new_and_alloc (size);
} else {
buf = (GstBuffer *) gst_mini_object_new (GST_TYPE_V4L2SRC_BUFFER);
GST_BUFFER_DATA (buf) = data;
GST_V4L2SRC_BUFFER (buf)->buf = srcbuf;
GST_LOG_OBJECT (v4l2src,
"creating buffer %p (nr. %d)", srcbuf, srcbuf->buffer.index);
}
GST_BUFFER_SIZE (buf) = size;
GST_BUFFER_TIMESTAMP (buf) =
gst_clock_get_time (GST_ELEMENT (v4l2src)->clock);
GST_BUFFER_TIMESTAMP (buf) -= GST_ELEMENT (v4l2src)->base_time;
GST_BUFFER_OFFSET (buf) = v4l2src->offset++;
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_READONLY);
if (v4l2src->fps_n > 0) {
GST_BUFFER_DURATION (buf) =
gst_util_uint64_scale_int (GST_SECOND, v4l2src->fps_d, v4l2src->fps_n);
} else {
GST_BUFFER_DURATION (buf) = GST_CLOCK_TIME_NONE;
}
/* the negotiate() method already set caps on the source pad */
gst_buffer_set_caps (buf, GST_PAD_CAPS (GST_BASE_SRC_PAD (v4l2src)));
return buf;
}
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