gstreamer/sys/v4l/v4lsrc_calls.c
Wim Taymans f1f26384e9 sys/v4l/: Fix duration and timestamping, taking latency into account.
Original commit message from CVS:
* sys/v4l/gstv4lsrc.c: (gst_v4lsrc_class_init), (gst_v4lsrc_init),
(gst_v4lsrc_fixate), (gst_v4lsrc_query):
* sys/v4l/v4lsrc_calls.c: (gst_v4lsrc_buffer_new):
Fix duration and timestamping, taking latency into account.
Implement latency query.
2007-02-28 15:05:03 +00:00

733 lines
22 KiB
C

/* GStreamer
*
* v4lsrc_calls.c: generic V4L source functions
*
* Copyright (C) 2001-2002 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.
*/
#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 "v4lsrc_calls.h"
#include <sys/time.h>
/* number of buffers to be queued *at least* before syncing */
#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_DEBUG_CATEGORY_EXTERN (v4l_debug);
#define GST_CAT_DEFAULT v4l_debug
#ifndef GST_DISABLE_GST_DEBUG
/* palette names */
const char *v4l_palette_name[] = {
"", /* 0 */
"grayscale", /* VIDEO_PALETTE_GREY */
"Hi-420", /* VIDEO_PALETTE_HI420 */
"16-bit RGB (RGB-565)", /* VIDEO_PALETTE_RB565 */
"24-bit RGB", /* VIDEO_PALETTE_RGB24 */
"32-bit RGB", /* VIDEO_PALETTE_RGB32 */
"15-bit RGB (RGB-555)", /* VIDEO_PALETTE_RGB555 */
"YUV-4:2:2 (packed)", /* VIDEO_PALETTE_YUV422 */
"YUYV", /* VIDEO_PALETTE_YUYV */
"UYVY", /* VIDEO_PALETTE_UYVY */
"YUV-4:2:0 (packed)", /* VIDEO_PALETTE_YUV420 */
"YUV-4:1:1 (packed)", /* VIDEO_PALETTE_YUV411 */
"Raw", /* VIDEO_PALETTE_RAW */
"YUV-4:2:2 (planar)", /* VIDEO_PALETTE_YUV422P */
"YUV-4:1:1 (planar)", /* VIDEO_PALETTE_YUV411P */
"YUV-4:2:0 (planar)/I420", /* VIDEO_PALETTE_YUV420P */
"YUV-4:1:0 (planar)" /* VIDEO_PALETTE_YUV410P */
};
#endif
/******************************************************
* gst_v4lsrc_queue_frame():
* queue a frame for capturing
* (ie. instruct the hardware to start capture)
* Requires queue_state lock to be held!
* return value: TRUE on success, FALSE on error
******************************************************/
static gboolean
gst_v4lsrc_queue_frame (GstV4lSrc * v4lsrc, gint num)
{
GST_LOG_OBJECT (v4lsrc, "queueing frame %d", num);
if (v4lsrc->frame_queue_state[num] != QUEUE_STATE_READY_FOR_QUEUE) {
return FALSE;
}
/* instruct the driver to prepare capture using buffer frame num */
v4lsrc->mmap.frame = num;
if (ioctl (GST_V4LELEMENT (v4lsrc)->video_fd,
VIDIOCMCAPTURE, &(v4lsrc->mmap)) < 0) {
GST_ELEMENT_ERROR (v4lsrc, RESOURCE, WRITE, (NULL),
("Error queueing a buffer (%d): %s", num, g_strerror (errno)));
return FALSE;
}
v4lsrc->frame_queue_state[num] = QUEUE_STATE_QUEUED;
v4lsrc->num_queued++;
return TRUE;
}
/******************************************************
* gst_v4lsrc_hard_sync_frame(GstV4lSrc *v4lsrc,gint num)
* sync a frame and set the timestamp correctly
* Requires queue_state lock to be held
*****************************************************/
static gboolean
gst_v4lsrc_sync_frame (GstV4lSrc * v4lsrc, gint num)
{
GST_LOG_OBJECT (v4lsrc, "VIOIOCSYNC on frame %d", num);
if (v4lsrc->frame_queue_state[num] != QUEUE_STATE_QUEUED) {
return FALSE;
}
while (ioctl (GST_V4LELEMENT (v4lsrc)->video_fd, VIDIOCSYNC, &num) < 0) {
/* if the sync() got interrupted, we can retry */
if (errno != EINTR) {
v4lsrc->frame_queue_state[num] = QUEUE_STATE_ERROR;
GST_ELEMENT_ERROR (v4lsrc, RESOURCE, SYNC, (NULL), GST_ERROR_SYSTEM);
return FALSE;
}
GST_DEBUG_OBJECT (v4lsrc, "Sync got interrupted");
}
GST_LOG_OBJECT (v4lsrc, "VIOIOCSYNC on frame %d done", num);
v4lsrc->frame_queue_state[num] = QUEUE_STATE_SYNCED;
v4lsrc->num_queued--;
return TRUE;
}
/******************************************************
* gst_v4lsrc_set_capture():
* set capture parameters, palette = VIDEO_PALETTE_*
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lsrc_set_capture (GstV4lSrc * v4lsrc,
gint width, gint height, gint palette)
{
GST_DEBUG_OBJECT (v4lsrc,
"capture properties set to %dx%d, palette %d", width, height, palette);
v4lsrc->mmap.width = width;
v4lsrc->mmap.height = height;
v4lsrc->mmap.format = palette;
return TRUE;
}
/******************************************************
* gst_v4lsrc_capture_init():
* initialize the capture system
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lsrc_capture_init (GstV4lSrc * v4lsrc)
{
GST_DEBUG_OBJECT (v4lsrc, "initting capture subsystem");
GST_V4L_CHECK_OPEN (GST_V4LELEMENT (v4lsrc));
GST_V4L_CHECK_NOT_ACTIVE (GST_V4LELEMENT (v4lsrc));
/* request the mmap buffer info:
* total size of mmap buffer, number of frames, offsets of frames */
if (ioctl (GST_V4LELEMENT (v4lsrc)->video_fd, VIDIOCGMBUF,
&(v4lsrc->mbuf)) < 0) {
GST_ELEMENT_ERROR (v4lsrc, RESOURCE, READ, (NULL),
("Error getting buffer information: %s", g_strerror (errno)));
return FALSE;
}
if (v4lsrc->mbuf.frames < MIN_BUFFERS_QUEUED) {
GST_ELEMENT_ERROR (v4lsrc, RESOURCE, READ, (NULL),
("Not enough buffers. We got %d, we want at least %d",
v4lsrc->mbuf.frames, MIN_BUFFERS_QUEUED));
return FALSE;
}
GST_INFO_OBJECT (v4lsrc, "Got %d buffers (\'%s\') with total size %d KB",
v4lsrc->mbuf.frames, v4l_palette_name[v4lsrc->mmap.format],
v4lsrc->mbuf.size / (v4lsrc->mbuf.frames * 1024));
/* keep track of queued buffers */
v4lsrc->frame_queue_state = (gint8 *)
g_malloc (sizeof (gint8) * v4lsrc->mbuf.frames);
/* lock for the frame_state */
v4lsrc->mutex_queue_state = g_mutex_new ();
v4lsrc->cond_queue_state = g_cond_new ();
/* Map the buffers */
GST_V4LELEMENT (v4lsrc)->buffer = mmap (0, v4lsrc->mbuf.size,
PROT_READ | PROT_WRITE, MAP_SHARED, GST_V4LELEMENT (v4lsrc)->video_fd, 0);
if (GST_V4LELEMENT (v4lsrc)->buffer == MAP_FAILED) {
GST_ELEMENT_ERROR (v4lsrc, RESOURCE, OPEN_READ_WRITE, (NULL),
("Error mapping video buffers: %s", g_strerror (errno)));
GST_V4LELEMENT (v4lsrc)->buffer = NULL;
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4lsrc_capture_start():
* start streaming capture
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lsrc_capture_start (GstV4lSrc * v4lsrc)
{
int n;
GST_DEBUG_OBJECT (v4lsrc, "starting capture");
GST_V4L_CHECK_OPEN (GST_V4LELEMENT (v4lsrc));
GST_V4L_CHECK_ACTIVE (GST_V4LELEMENT (v4lsrc));
g_mutex_lock (v4lsrc->mutex_queue_state);
v4lsrc->quit = FALSE;
v4lsrc->num_queued = 0;
v4lsrc->sync_frame = 0;
v4lsrc->queue_frame = 0;
/* set all buffers ready to queue, and queue captures to the device.
* This starts streaming capture */
for (n = 0; n < v4lsrc->mbuf.frames; n++) {
v4lsrc->frame_queue_state[n] = QUEUE_STATE_READY_FOR_QUEUE;
if (!gst_v4lsrc_queue_frame (v4lsrc, n)) {
g_mutex_unlock (v4lsrc->mutex_queue_state);
gst_v4lsrc_capture_stop (v4lsrc);
return FALSE;
}
}
v4lsrc->is_capturing = TRUE;
g_mutex_unlock (v4lsrc->mutex_queue_state);
return TRUE;
}
/******************************************************
* gst_v4lsrc_grab_frame():
* capture one frame during streaming capture
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lsrc_grab_frame (GstV4lSrc * v4lsrc, gint * num)
{
GST_LOG_OBJECT (v4lsrc, "grabbing frame %d", *num);
GST_V4L_CHECK_OPEN (GST_V4LELEMENT (v4lsrc));
GST_V4L_CHECK_ACTIVE (GST_V4LELEMENT (v4lsrc));
g_mutex_lock (v4lsrc->mutex_queue_state);
/* do we have enough frames? */
while (v4lsrc->num_queued < MIN_BUFFERS_QUEUED ||
v4lsrc->frame_queue_state[v4lsrc->queue_frame] ==
QUEUE_STATE_READY_FOR_QUEUE) {
while (v4lsrc->frame_queue_state[v4lsrc->queue_frame] !=
QUEUE_STATE_READY_FOR_QUEUE && !v4lsrc->quit) {
GST_DEBUG_OBJECT (v4lsrc,
"Waiting for frames to become available (queued %d < minimum %d)",
v4lsrc->num_queued, MIN_BUFFERS_QUEUED);
g_cond_wait (v4lsrc->cond_queue_state, v4lsrc->mutex_queue_state);
}
if (v4lsrc->quit) {
g_mutex_unlock (v4lsrc->mutex_queue_state);
return FALSE;
}
if (!gst_v4lsrc_queue_frame (v4lsrc, v4lsrc->queue_frame)) {
g_mutex_unlock (v4lsrc->mutex_queue_state);
return FALSE;
}
v4lsrc->queue_frame = (v4lsrc->queue_frame + 1) % v4lsrc->mbuf.frames;
}
/* syncing on the buffer grabs it */
*num = v4lsrc->sync_frame;
if (!gst_v4lsrc_sync_frame (v4lsrc, *num)) {
g_mutex_unlock (v4lsrc->mutex_queue_state);
return FALSE;
}
v4lsrc->sync_frame = (v4lsrc->sync_frame + 1) % v4lsrc->mbuf.frames;
g_mutex_unlock (v4lsrc->mutex_queue_state);
return TRUE;
}
/******************************************************
* gst_v4lsrc_get_buffer():
* get the address of the given frame number in the mmap'd buffer
* return value: the buffer's address or NULL
******************************************************/
guint8 *
gst_v4lsrc_get_buffer (GstV4lSrc * v4lsrc, gint num)
{
if (!GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lsrc)) ||
!GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lsrc)))
return NULL;
if (num < 0 || num >= v4lsrc->mbuf.frames)
return NULL;
return GST_V4LELEMENT (v4lsrc)->buffer + v4lsrc->mbuf.offsets[num];
}
/******************************************************
* gst_v4lsrc_requeue_frame():
* re-queue a frame after we're done with the buffer
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lsrc_requeue_frame (GstV4lSrc * v4lsrc, gint num)
{
GST_LOG_OBJECT (v4lsrc, "requeueing frame %d", num);
GST_V4L_CHECK_OPEN (GST_V4LELEMENT (v4lsrc));
GST_V4L_CHECK_ACTIVE (GST_V4LELEMENT (v4lsrc));
/* mark frame as 'ready to requeue' */
g_mutex_lock (v4lsrc->mutex_queue_state);
if (v4lsrc->frame_queue_state[num] != QUEUE_STATE_SYNCED) {
GST_ELEMENT_ERROR (v4lsrc, RESOURCE, TOO_LAZY, (NULL),
("Invalid state %d (expected %d), can't requeue",
v4lsrc->frame_queue_state[num], QUEUE_STATE_SYNCED));
return FALSE;
}
v4lsrc->frame_queue_state[num] = QUEUE_STATE_READY_FOR_QUEUE;
/* let an optional wait know */
g_cond_broadcast (v4lsrc->cond_queue_state);
g_mutex_unlock (v4lsrc->mutex_queue_state);
return TRUE;
}
/******************************************************
* gst_v4lsrc_capture_stop():
* stop streaming capture
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lsrc_capture_stop (GstV4lSrc * v4lsrc)
{
GST_DEBUG_OBJECT (v4lsrc, "stopping capture");
GST_V4L_CHECK_OPEN (GST_V4LELEMENT (v4lsrc));
GST_V4L_CHECK_ACTIVE (GST_V4LELEMENT (v4lsrc));
g_mutex_lock (v4lsrc->mutex_queue_state);
v4lsrc->is_capturing = FALSE;
/* make an optional pending wait stop */
v4lsrc->quit = TRUE;
g_cond_broadcast (v4lsrc->cond_queue_state);
/* sync on remaining frames */
while (1) {
if (v4lsrc->frame_queue_state[v4lsrc->sync_frame] == QUEUE_STATE_QUEUED) {
gst_v4lsrc_sync_frame (v4lsrc, v4lsrc->sync_frame);
v4lsrc->sync_frame = (v4lsrc->sync_frame + 1) % v4lsrc->mbuf.frames;
} else {
break;
}
}
g_mutex_unlock (v4lsrc->mutex_queue_state);
return TRUE;
}
/******************************************************
* gst_v4lsrc_capture_deinit():
* deinitialize the capture system
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lsrc_capture_deinit (GstV4lSrc * v4lsrc)
{
GST_DEBUG_OBJECT (v4lsrc, "quitting capture subsystem");
GST_V4L_CHECK_OPEN (GST_V4LELEMENT (v4lsrc));
GST_V4L_CHECK_ACTIVE (GST_V4LELEMENT (v4lsrc));
/* free buffer tracker */
g_mutex_free (v4lsrc->mutex_queue_state);
v4lsrc->mutex_queue_state = NULL;
g_cond_free (v4lsrc->cond_queue_state);
v4lsrc->cond_queue_state = NULL;
g_free (v4lsrc->frame_queue_state);
v4lsrc->frame_queue_state = NULL;
/* unmap the buffer */
if (munmap (GST_V4LELEMENT (v4lsrc)->buffer, v4lsrc->mbuf.size) == -1) {
GST_ELEMENT_ERROR (v4lsrc, RESOURCE, CLOSE, (NULL),
("error munmap'ing capture buffer: %s", g_strerror (errno)));
return FALSE;
}
GST_V4LELEMENT (v4lsrc)->buffer = NULL;
return TRUE;
}
/******************************************************
* gst_v4lsrc_try_capture():
* try out a capture on the device
* This has to be done before initializing the
* actual capture system, to make sure we don't
* mess up anything. So we need to mini-mmap()
* a buffer here, queue and sync on one buffer,
* and unmap it.
* This is ugly, yes, I know - but it's a major
* design flaw of v4l1 that you don't know in
* advance which formats will be supported...
* This is better than "just assuming that it'll
* work"...
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lsrc_try_capture (GstV4lSrc * v4lsrc, gint width, gint height,
gint palette)
{
/* so, we need a buffer and some more stuff */
int frame = 0;
guint8 *buffer;
struct video_mbuf vmbuf;
struct video_mmap vmmap;
GST_DEBUG_OBJECT (v4lsrc, "try out %dx%d, palette format %d (%s)",
width, height, palette, v4l_palette_name[palette]);
GST_V4L_CHECK_OPEN (GST_V4LELEMENT (v4lsrc));
GST_V4L_CHECK_NOT_ACTIVE (GST_V4LELEMENT (v4lsrc));
/* let's start by requesting a buffer and mmap()'ing it */
if (ioctl (GST_V4LELEMENT (v4lsrc)->video_fd, VIDIOCGMBUF, &vmbuf) < 0) {
GST_ELEMENT_ERROR (v4lsrc, RESOURCE, READ, (NULL),
("Error getting buffer information: %s", g_strerror (errno)));
return FALSE;
}
/* Map the buffers */
buffer = mmap (0, vmbuf.size, PROT_READ | PROT_WRITE,
MAP_SHARED, GST_V4LELEMENT (v4lsrc)->video_fd, 0);
if (buffer == MAP_FAILED) {
GST_ELEMENT_ERROR (v4lsrc, RESOURCE, OPEN_READ_WRITE, (NULL),
("Error mapping our try-out buffer: %s", g_strerror (errno)));
return FALSE;
}
/* now that we have a buffer, let's try out our format */
vmmap.width = width;
vmmap.height = height;
vmmap.format = palette;
vmmap.frame = frame;
if (ioctl (GST_V4LELEMENT (v4lsrc)->video_fd, VIDIOCMCAPTURE, &vmmap) < 0) {
if (errno != EINVAL) /* our format failed! */
GST_ERROR_OBJECT (v4lsrc,
"Error queueing our try-out buffer: %s", g_strerror (errno));
munmap (buffer, vmbuf.size);
return FALSE;
}
if (ioctl (GST_V4LELEMENT (v4lsrc)->video_fd, VIDIOCSYNC, &frame) < 0) {
GST_ELEMENT_ERROR (v4lsrc, RESOURCE, SYNC, (NULL), GST_ERROR_SYSTEM);
munmap (buffer, vmbuf.size);
return FALSE;
}
munmap (buffer, vmbuf.size);
/* if we got here, it worked! woohoo, the format is supported! */
return TRUE;
}
#ifndef GST_DISABLE_GST_DEBUG
const char *
gst_v4lsrc_palette_name (int i)
{
return v4l_palette_name[i];
}
#endif
gboolean
gst_v4lsrc_get_fps (GstV4lSrc * v4lsrc, gint * fps_n, gint * fps_d)
{
gint norm;
gint fps_index;
struct video_window *vwin = &GST_V4LELEMENT (v4lsrc)->vwin;
/* check if we have vwin window properties giving a framerate,
* as is done for webcams
* See http://www.smcc.demon.nl/webcam/api.html
* which is used for the Philips and qce-ga drivers */
fps_index = (vwin->flags >> 16) & 0x3F; /* 6 bit index for framerate */
/* webcams have a non-zero fps_index */
if (fps_index != 0) {
/* index of 16 corresponds to 15 fps */
GST_DEBUG_OBJECT (v4lsrc, "device reports fps of %d/%d (%.4f)",
fps_index * 15, 16, fps_index * 15.0 / 16);
if (fps_n)
*fps_n = fps_index * 15;
if (fps_d)
*fps_d = 16;
return TRUE;
}
/* removed fps estimation code here */
/* if that failed ... */
if (!GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lsrc)))
return FALSE;
if (!gst_v4l_get_chan_norm (GST_V4LELEMENT (v4lsrc), NULL, &norm))
return FALSE;
if (norm == VIDEO_MODE_NTSC) {
if (fps_n)
*fps_n = 30000;
if (fps_d)
*fps_d = 1001;
} else {
if (fps_n)
*fps_n = 25;
if (fps_d)
*fps_d = 1;
}
return TRUE;
}
/* get a list of possible framerates
* this is only done for webcams;
* other devices return NULL here.
* this function takes a LONG time to execute.
*/
GValue *
gst_v4lsrc_get_fps_list (GstV4lSrc * v4lsrc)
{
gint fps_index;
struct video_window *vwin = &GST_V4LELEMENT (v4lsrc)->vwin;
GstV4lElement *v4lelement = GST_V4LELEMENT (v4lsrc);
/* check if we have vwin window properties giving a framerate,
* as is done for webcams
* See http://www.smcc.demon.nl/webcam/api.html
* which is used for the Philips and qce-ga drivers */
fps_index = (vwin->flags >> 16) & 0x3F; /* 6 bit index for framerate */
/* webcams have a non-zero fps_index */
if (fps_index == 0) {
GST_DEBUG_OBJECT (v4lsrc, "fps_index is 0, no webcam");
return NULL;
}
GST_DEBUG_OBJECT (v4lsrc, "fps_index is %d, so webcam", fps_index);
{
int i;
GValue *list = NULL;
GValue value = { 0 };
/* webcam detected, so try all framerates and return a list */
list = g_new0 (GValue, 1);
g_value_init (list, GST_TYPE_LIST);
/* index of 16 corresponds to 15 fps */
GST_DEBUG_OBJECT (v4lsrc, "device reports fps of %d/%d (%.4f)",
fps_index * 15, 16, fps_index * 15.0 / 16);
for (i = 0; i < 63; ++i) {
/* set bits 16 to 21 to 0 */
vwin->flags &= (0x3F00 - 1);
/* set bits 16 to 21 to the index */
vwin->flags |= i << 16;
if (gst_v4l_set_window_properties (v4lelement)) {
/* setting it succeeded. FIXME: get it and check. */
g_value_init (&value, GST_TYPE_FRACTION);
gst_value_set_fraction (&value, i * 15, 16);
gst_value_list_append_value (list, &value);
g_value_unset (&value);
}
}
/* FIXME: set back the original fps_index */
vwin->flags &= (0x3F00 - 1);
vwin->flags |= fps_index << 16;
gst_v4l_set_window_properties (v4lelement);
return list;
}
return NULL;
}
#define GST_TYPE_V4LSRC_BUFFER (gst_v4lsrc_buffer_get_type())
#define GST_IS_V4LSRC_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_V4LSRC_BUFFER))
#define GST_V4LSRC_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_V4LSRC_BUFFER, GstV4lSrcBuffer))
typedef struct _GstV4lSrcBuffer
{
GstBuffer buffer;
GstV4lSrc *v4lsrc;
gint num;
} GstV4lSrcBuffer;
static void gst_v4lsrc_buffer_class_init (gpointer g_class,
gpointer class_data);
static void gst_v4lsrc_buffer_init (GTypeInstance * instance, gpointer g_class);
static void gst_v4lsrc_buffer_finalize (GstV4lSrcBuffer * v4lsrc_buffer);
GType
gst_v4lsrc_buffer_get_type (void)
{
static GType _gst_v4lsrc_buffer_type;
if (G_UNLIKELY (_gst_v4lsrc_buffer_type == 0)) {
static const GTypeInfo v4lsrc_buffer_info = {
sizeof (GstBufferClass),
NULL,
NULL,
gst_v4lsrc_buffer_class_init,
NULL,
NULL,
sizeof (GstV4lSrcBuffer),
0,
gst_v4lsrc_buffer_init,
NULL
};
_gst_v4lsrc_buffer_type = g_type_register_static (GST_TYPE_BUFFER,
"GstV4lSrcBuffer", &v4lsrc_buffer_info, 0);
}
return _gst_v4lsrc_buffer_type;
}
static void
gst_v4lsrc_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_v4lsrc_buffer_finalize;
}
static void
gst_v4lsrc_buffer_init (GTypeInstance * instance, gpointer g_class)
{
}
static void
gst_v4lsrc_buffer_finalize (GstV4lSrcBuffer * v4lsrc_buffer)
{
GstV4lSrc *v4lsrc;
gint num;
v4lsrc = v4lsrc_buffer->v4lsrc;
num = v4lsrc_buffer->num;
GST_LOG_OBJECT (v4lsrc, "freeing buffer %p for frame %d", v4lsrc_buffer, num);
/* only requeue if we still have an mmap buffer */
if (GST_V4LELEMENT (v4lsrc)->buffer) {
GST_LOG_OBJECT (v4lsrc, "requeueing frame %d", num);
gst_v4lsrc_requeue_frame (v4lsrc, num);
}
gst_object_unref (v4lsrc);
}
/* Create a V4lSrc buffer from our mmap'd data area */
GstBuffer *
gst_v4lsrc_buffer_new (GstV4lSrc * v4lsrc, gint num)
{
GstBuffer *buf;
gint fps_n, fps_d;
GstClockTime duration, timestamp, latency;
GST_DEBUG_OBJECT (v4lsrc, "creating buffer for frame %d", num);
g_return_val_if_fail (gst_v4lsrc_get_fps (v4lsrc, &fps_n, &fps_d), NULL);
buf = (GstBuffer *) gst_mini_object_new (GST_TYPE_V4LSRC_BUFFER);
GST_V4LSRC_BUFFER (buf)->num = num;
GST_V4LSRC_BUFFER (buf)->v4lsrc = gst_object_ref (v4lsrc);
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_READONLY);
GST_BUFFER_DATA (buf) = gst_v4lsrc_get_buffer (v4lsrc, num);
GST_BUFFER_SIZE (buf) = v4lsrc->buffer_size;
GST_BUFFER_OFFSET (buf) = v4lsrc->offset++;
duration = gst_util_uint64_scale_int (GST_SECOND, fps_d, fps_n);
latency = duration;
timestamp = gst_clock_get_time (GST_ELEMENT_CAST (v4lsrc)->clock);
timestamp -= gst_element_get_base_time (GST_ELEMENT_CAST (v4lsrc));
if (timestamp > latency)
timestamp -= latency;
else
timestamp = 0;
GST_BUFFER_TIMESTAMP (buf) = timestamp;
GST_BUFFER_DURATION (buf) = duration;
/* the negotiate() method already set caps on the source pad */
gst_buffer_set_caps (buf, GST_PAD_CAPS (GST_BASE_SRC_PAD (v4lsrc)));
return buf;
}