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gstreamer/sys/v4l/v4lsrc_calls.c
Ronald S. Bultje 39e02b7779 make v4l element do all calls in one thread, this makes performance much better (because of kernel locking, more thre... 
Original commit message from CVS:
make v4l element do all calls in one thread, this makes performance much better (because of kernel locking, more threads doesn't make sense anyway)
2003-02-06 18:45:35 +00:00

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/* G-Streamer BT8x8/V4L frame grabber plugin
* 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.
*/
#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
#define DEBUG(format, args...) \
GST_DEBUG_ELEMENT(GST_CAT_PLUGIN_INFO, \
GST_ELEMENT(v4lsrc), \
"V4LSRC: " format, ##args)
/* palette names */
char *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)", /* VIDEO_PALETTE_YUV420P */
"YUV-4:1:0 (planar)" /* VIDEO_PALETTE_YUV410P */
};
/******************************************************
* gst_v4lsrc_queue_frame():
* queue a frame for capturing
* return value: TRUE on success, FALSE on error
******************************************************/
static gboolean
gst_v4lsrc_queue_frame (GstV4lSrc *v4lsrc,
gint num)
{
DEBUG("queueing frame %d", num);
v4lsrc->mmap.frame = num;
if (v4lsrc->frame_queued[num] == -1)
{
//v4lsrc->frame_queued[num] = 0;
return TRUE;
}
if (ioctl(GST_V4LELEMENT(v4lsrc)->video_fd, VIDIOCMCAPTURE, &(v4lsrc->mmap)) < 0)
{
gst_element_error(GST_ELEMENT(v4lsrc),
"Error queueing a buffer (%d): %s",
num, g_strerror(errno));
return FALSE;
}
v4lsrc->frame_queued[num] = 1;
v4lsrc->num_queued_frames++;
v4lsrc->total_queued_frames++;
return TRUE;
}
/******************************************************
* gst_v4lsrc_soft_sync_thread()
* syncs on frames and signals the main thread
* purpose: actually get the correct frame timestamps
******************************************************/
static void *
gst_v4lsrc_soft_sync_thread (void *arg)
{
GstV4lSrc *v4lsrc = GST_V4LSRC(arg);
gint frame = 0;
DEBUG("starting software sync thread");
while (1)
{
/* this cycle is non-onbligatory - we just queue frames
* as they become available, below, we'll wait for queues
* if we don't have enough of them */
while (1)
{
gint qframe = v4lsrc->total_queued_frames % v4lsrc->mbuf.frames;
g_mutex_lock(v4lsrc->mutex_queued_frames);
if (v4lsrc->frame_queued[qframe] == -2)
{
if (!gst_v4lsrc_queue_frame(v4lsrc, qframe))
{
g_mutex_unlock(v4lsrc->mutex_queued_frames);
g_mutex_lock(v4lsrc->mutex_soft_sync);
/* note that we use *frame* here, not *qframe* -
* reason is simple, the thread waiting for us needs
* to know that we stopped syncing on *this* frame,
* we didn't even start with qframe yet */
v4lsrc->isready_soft_sync[frame] = -1;
g_cond_broadcast(v4lsrc->cond_soft_sync[frame]);
g_mutex_unlock(v4lsrc->mutex_soft_sync);
goto end;
}
}
else {
g_mutex_unlock(v4lsrc->mutex_queued_frames);
break;
}
g_mutex_unlock(v4lsrc->mutex_queued_frames);
}
/* are there queued frames left? */
while (v4lsrc->num_queued_frames < MIN_BUFFERS_QUEUED)
{
gint qframe = v4lsrc->total_queued_frames % v4lsrc->mbuf.frames;
g_mutex_lock(v4lsrc->mutex_queued_frames);
if (v4lsrc->frame_queued[frame] == -1) {
g_mutex_unlock(v4lsrc->mutex_queued_frames);
break;
}
DEBUG("Waiting for new frames to be queued (%d < %d, frame=%d)",
v4lsrc->num_queued_frames, MIN_BUFFERS_QUEUED, qframe);
/* sleep for new buffers to be completed encoding. After that,
* requeue them so we have more than MIN_QUEUES_NEEDED buffers
* free */
while (v4lsrc->frame_queued[qframe] != -2)
{
g_cond_wait(v4lsrc->cond_queued_frames,
v4lsrc->mutex_queued_frames);
if (v4lsrc->frame_queued[qframe] == -1) {
g_mutex_unlock(v4lsrc->mutex_queued_frames);
goto end;
}
}
if (!gst_v4lsrc_queue_frame(v4lsrc, qframe))
{
g_mutex_unlock(v4lsrc->mutex_queued_frames);
g_mutex_lock(v4lsrc->mutex_soft_sync);
/* note that we use *frame* here, not *qframe* -
* reason is simple, the thread waiting for us needs
* to know that we stopped syncing on *this* frame,
* we didn't even start with qframe yet */
v4lsrc->isready_soft_sync[frame] = -1;
g_cond_broadcast(v4lsrc->cond_soft_sync[frame]);
g_mutex_unlock(v4lsrc->mutex_soft_sync);
goto end;
}
g_mutex_unlock(v4lsrc->mutex_queued_frames);
}
if (!v4lsrc->num_queued_frames)
{
DEBUG("Got signal to exit...");
goto end;
}
/* sync on the frame */
DEBUG("Sync\'ing on frame %d", frame);
retry:
if (ioctl(GST_V4LELEMENT(v4lsrc)->video_fd, VIDIOCSYNC, &frame) < 0)
{
/* if the sync() got interrupted, we can retry */
if (errno == EINTR)
goto retry;
gst_element_error(GST_ELEMENT(v4lsrc),
"Error syncing on a buffer (%d): %s",
frame, g_strerror(errno));
g_mutex_lock(v4lsrc->mutex_soft_sync);
v4lsrc->isready_soft_sync[frame] = -1;
g_cond_broadcast(v4lsrc->cond_soft_sync[frame]);
g_mutex_unlock(v4lsrc->mutex_soft_sync);
goto end;
}
else
{
g_mutex_lock(v4lsrc->mutex_soft_sync);
gettimeofday(&(v4lsrc->timestamp_soft_sync[frame]), NULL);
v4lsrc->isready_soft_sync[frame] = 1;
g_cond_broadcast(v4lsrc->cond_soft_sync[frame]);
g_mutex_unlock(v4lsrc->mutex_soft_sync);
}
g_mutex_lock(v4lsrc->mutex_queued_frames);
v4lsrc->num_queued_frames--;
v4lsrc->frame_queued[frame] = 0;
g_mutex_unlock(v4lsrc->mutex_queued_frames);
frame = (frame+1)%v4lsrc->mbuf.frames;
}
end:
DEBUG("Software sync thread got signalled to exit");
g_thread_exit(NULL);
return NULL;
}
/******************************************************
* gst_v4lsrc_sync_frame():
* sync on a frame for capturing
* return value: TRUE on success, FALSE on error
******************************************************/
static gboolean
gst_v4lsrc_sync_next_frame (GstV4lSrc *v4lsrc,
gint *num)
{
*num = v4lsrc->sync_frame = (v4lsrc->sync_frame + 1)%v4lsrc->mbuf.frames;
DEBUG("syncing on next frame (%d)", *num);
/* "software sync()" on the frame */
g_mutex_lock(v4lsrc->mutex_soft_sync);
if (v4lsrc->isready_soft_sync[*num] == 0)
{
DEBUG("Waiting for frame %d to be synced on", *num);
g_cond_wait(v4lsrc->cond_soft_sync[*num], v4lsrc->mutex_soft_sync);
}
if (v4lsrc->isready_soft_sync[*num] < 0)
return FALSE;
v4lsrc->isready_soft_sync[*num] = 0;
g_mutex_unlock(v4lsrc->mutex_soft_sync);
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)
{
DEBUG("capture properties set to width = %d, height = %d, palette = %d",
width, height, palette);
/*GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lsrc));*/
/*GST_V4L_CHECK_NOT_ACTIVE(GST_V4LELEMENT(v4lsrc));*/
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)
{
int n;
DEBUG("initting capture subsystem");
GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lsrc));
GST_V4L_CHECK_NOT_ACTIVE(GST_V4LELEMENT(v4lsrc));
/* request buffer info */
if (ioctl(GST_V4LELEMENT(v4lsrc)->video_fd, VIDIOCGMBUF, &(v4lsrc->mbuf)) < 0)
{
gst_element_error(GST_ELEMENT(v4lsrc),
"Error getting buffer information: %s",
g_strerror(errno));
return FALSE;
}
if (v4lsrc->mbuf.frames < MIN_BUFFERS_QUEUED)
{
gst_element_error(GST_ELEMENT(v4lsrc),
"Too little buffers. We got %d, we want at least %d",
v4lsrc->mbuf.frames, MIN_BUFFERS_QUEUED);
return FALSE;
}
gst_info("Got %d buffers (\'%s\') of size %d KB\n",
v4lsrc->mbuf.frames, palette_name[v4lsrc->mmap.format],
v4lsrc->mbuf.size/(v4lsrc->mbuf.frames*1024));
/* keep trakc of queued buffers */
v4lsrc->frame_queued = (gint8 *) malloc(sizeof(gint8) * v4lsrc->mbuf.frames);
if (!v4lsrc->frame_queued)
{
gst_element_error(GST_ELEMENT(v4lsrc),
"Error creating buffer tracker: %s",
g_strerror(errno));
return FALSE;
}
for (n=0;n<v4lsrc->mbuf.frames;n++)
v4lsrc->frame_queued[n] = 0;
/* init the GThread stuff */
v4lsrc->mutex_soft_sync = g_mutex_new();
v4lsrc->isready_soft_sync = (gint8 *) malloc(sizeof(gint8) * v4lsrc->mbuf.frames);
if (!v4lsrc->isready_soft_sync)
{
gst_element_error(GST_ELEMENT(v4lsrc),
"Error creating software-sync buffer tracker: %s",
g_strerror(errno));
return FALSE;
}
for (n=0;n<v4lsrc->mbuf.frames;n++)
v4lsrc->isready_soft_sync[n] = 0;
v4lsrc->timestamp_soft_sync = (struct timeval *)
malloc(sizeof(struct timeval) * v4lsrc->mbuf.frames);
if (!v4lsrc->timestamp_soft_sync)
{
gst_element_error(GST_ELEMENT(v4lsrc),
"Error creating software-sync timestamp tracker: %s",
g_strerror(errno));
return FALSE;
}
v4lsrc->cond_soft_sync = (GCond **) malloc( sizeof(GCond *) * v4lsrc->mbuf.frames);
if (!v4lsrc->cond_soft_sync)
{
gst_element_error(GST_ELEMENT(v4lsrc),
"Error creating software-sync condition tracker: %s",
g_strerror(errno));
return FALSE;
}
for (n=0;n<v4lsrc->mbuf.frames;n++)
v4lsrc->cond_soft_sync[n] = g_cond_new();
v4lsrc->mutex_queued_frames = g_mutex_new();
v4lsrc->cond_queued_frames = 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(GST_ELEMENT(v4lsrc),
"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)
{
GError *error = NULL;
int n;
DEBUG("starting capture");
GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lsrc));
GST_V4L_CHECK_ACTIVE(GST_V4LELEMENT(v4lsrc));
v4lsrc->num_queued_frames = 0;
v4lsrc->total_queued_frames = 0;
/* queue all buffers, this starts streaming capture */
for (n=0;n<v4lsrc->mbuf.frames;n++)
if (!gst_v4lsrc_queue_frame(v4lsrc, n))
return FALSE;
v4lsrc->sync_frame = -1;
/* start the sync() thread (correct timestamps) */
v4lsrc->thread_soft_sync = g_thread_create(gst_v4lsrc_soft_sync_thread,
(void *) v4lsrc, TRUE, &error);
if (!v4lsrc->thread_soft_sync)
{
gst_element_error(GST_ELEMENT(v4lsrc),
"Failed to create software sync thread: %s",error->message);
return FALSE;
}
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)
{
DEBUG("grabbing frame");
GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lsrc));
GST_V4L_CHECK_ACTIVE(GST_V4LELEMENT(v4lsrc));
/* syncing on the buffer grabs it */
if (!gst_v4lsrc_sync_next_frame(v4lsrc, num))
return FALSE;
return TRUE;
}
/******************************************************
* gst_v4lsrc_get_buffer():
* get the address of the just-capture buffer
* return value: the buffer's address or NULL
******************************************************/
guint8 *
gst_v4lsrc_get_buffer (GstV4lSrc *v4lsrc, gint num)
{
/*DEBUG("gst_v4lsrc_get_buffer(), num = %d", 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)
{
DEBUG("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_queued_frames);
v4lsrc->frame_queued[num] = -2;
g_cond_broadcast(v4lsrc->cond_queued_frames);
g_mutex_unlock(v4lsrc->mutex_queued_frames);
return TRUE;
}
/******************************************************
* gst_v4lsrc_capture_stop():
* stop streaming capture
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lsrc_capture_stop (GstV4lSrc *v4lsrc)
{
int n;
DEBUG("stopping capture");
GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lsrc));
GST_V4L_CHECK_ACTIVE(GST_V4LELEMENT(v4lsrc));
/* we actually need to sync on all queued buffers but
* not on the non-queued ones */
g_mutex_lock(v4lsrc->mutex_queued_frames);
for (n=0;n<v4lsrc->mbuf.frames;n++)
v4lsrc->frame_queued[n] = -1;
g_cond_broadcast(v4lsrc->cond_queued_frames);
g_mutex_unlock(v4lsrc->mutex_queued_frames);
g_thread_join(v4lsrc->thread_soft_sync);
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)
{
int n;
DEBUG("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_queued_frames);
for (n=0;n<v4lsrc->mbuf.frames;n++)
g_cond_free(v4lsrc->cond_soft_sync[n]);
free(v4lsrc->frame_queued);
free(v4lsrc->cond_soft_sync);
free(v4lsrc->isready_soft_sync);
free(v4lsrc->timestamp_soft_sync);
/* unmap the buffer */
munmap(GST_V4LELEMENT(v4lsrc)->buffer, v4lsrc->mbuf.size);
GST_V4LELEMENT(v4lsrc)->buffer = NULL;
return TRUE;
}
/******************************************************
* gst_v4lsrc_try_palette():
* try out a palette 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_palette (GstV4lSrc *v4lsrc,
gint palette)
{
/* so, we need a buffer and some more stuff */
int frame = 0;
guint8 *buffer;
struct video_mbuf vmbuf;
struct video_mmap vmmap;
DEBUG("gonna try out palette format %d (%s)",
palette, 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(GST_ELEMENT(v4lsrc),
"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(GST_ELEMENT(v4lsrc),
"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 = GST_V4LELEMENT(v4lsrc)->vcap.minwidth;
vmmap.height = GST_V4LELEMENT(v4lsrc)->vcap.minheight;
vmmap.format = palette;
vmmap.frame = frame;
if (ioctl(GST_V4LELEMENT(v4lsrc)->video_fd, VIDIOCMCAPTURE, &vmmap) < 0)
{
if (errno != EINVAL) /* our format failed! */
gst_element_error(GST_ELEMENT(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(GST_ELEMENT(v4lsrc),
"Error syncing on a buffer (%d): %s",
frame, g_strerror(errno));
munmap(buffer, vmbuf.size);
return FALSE;
}
munmap(buffer, vmbuf.size);
/* if we got here, it worked! woohoo, the format is supported! */
return TRUE;
}
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