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gstreamer/sys/v4l/v4lmjpegsrc_calls.c
Ronald S. Bultje 0f124a569d Some interface implementations for video4linux/video4linux2 plugins: a Tuner interface, with which one can select inp... 
Original commit message from CVS:
Some interface implementations for video4linux/video4linux2 plugins:
* a Tuner interface, with which one can select inputs and stations. Audio
work is underway here, but unfinished.
* A Xoverlay interface with which one can do simple overlay. Similar to
the API of the v4l/Xv XFree86 extension. Widget implementation for
GTK-2.0 coming up in the sandbox.
* Colorbalance - for adapting colors (brightness, contrast, etc.) - pretty
basic and maybe somewhat overdesigned. But it'll do for now.

Apart from these interfaces, there's also a loadable library 'xwindowlistener'
that listenes to X for the movement of a window and the overlap of other
windows. This is partly copied from xawtv (and thus partly GPL :(), but it's
needed for the xoverlay interface implementation in the v4l/v4l2 elements.

Lastly, some small changes to remove redundant properties from the v4l/v4l2
elements since these can be done much simpler. Comments appreciated!
2003-10-10 12:47:41 +00:00

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/* G-Streamer hardware MJPEG video source 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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#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 "v4lmjpegsrc_calls.h"
/* On some systems MAP_FAILED seems to be missing */
#ifndef MAP_FAILED
#define MAP_FAILED ( (caddr_t) -1 )
#endif
#define MIN_BUFFERS_QUEUED 2
#define DEBUG(format, args...) \
GST_DEBUG_OBJECT (\
GST_ELEMENT(v4lmjpegsrc), \
"V4LMJPEGSRC: " format, ##args)
enum {
QUEUE_STATE_ERROR = -1,
QUEUE_STATE_READY_FOR_QUEUE,
QUEUE_STATE_QUEUED,
QUEUE_STATE_SYNCED,
};
/******************************************************
* gst_v4lmjpegsrc_queue_frame():
* queue a frame for capturing
* return value: TRUE on success, FALSE on error
******************************************************/
static gboolean
gst_v4lmjpegsrc_queue_frame (GstV4lMjpegSrc *v4lmjpegsrc,
gint num)
{
DEBUG("queueing frame %d", num);
if (v4lmjpegsrc->frame_queue_state[num] != QUEUE_STATE_READY_FOR_QUEUE) {
return FALSE;
}
if (ioctl(GST_V4LELEMENT(v4lmjpegsrc)->video_fd, MJPIOC_QBUF_CAPT, &num) < 0)
{
gst_element_error(GST_ELEMENT(v4lmjpegsrc),
"Error queueing a buffer (%d): %s",
num, g_strerror(errno));
return FALSE;
}
v4lmjpegsrc->frame_queue_state[num] = QUEUE_STATE_QUEUED;
v4lmjpegsrc->num_queued++;
return TRUE;
}
/******************************************************
* gst_v4lmjpegsrc_sync_next_frame():
* sync on the next frame for capturing
* return value: TRUE on success, FALSE on error
******************************************************/
static gboolean
gst_v4lmjpegsrc_sync_next_frame (GstV4lMjpegSrc *v4lmjpegsrc,
gint *num)
{
DEBUG("syncing on next frame");
if (v4lmjpegsrc->num_queued <= 0) {
return FALSE;
}
while (ioctl(GST_V4LELEMENT(v4lmjpegsrc)->video_fd,
MJPIOC_SYNC, &(v4lmjpegsrc->bsync)) < 0) {
if (errno != EINTR) {
gst_element_error(GST_ELEMENT(v4lmjpegsrc),
"Error syncing on a buffer: %s",
g_strerror(errno));
return FALSE;
}
DEBUG("Sync got interrupted");
}
*num = v4lmjpegsrc->bsync.frame;
v4lmjpegsrc->frame_queue_state[*num] = QUEUE_STATE_SYNCED;
v4lmjpegsrc->num_queued--;
return TRUE;
}
/******************************************************
* gst_v4lmjpegsrc_set_buffer():
* set buffer parameters (size/count)
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lmjpegsrc_set_buffer (GstV4lMjpegSrc *v4lmjpegsrc,
gint numbufs,
gint bufsize)
{
DEBUG("setting buffer info to numbufs = %d, bufsize = %d KB",
numbufs, bufsize);
GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lmjpegsrc));
GST_V4L_CHECK_NOT_ACTIVE(GST_V4LELEMENT(v4lmjpegsrc));
v4lmjpegsrc->breq.size = bufsize * 1024;
v4lmjpegsrc->breq.count = numbufs;
return TRUE;
}
/******************************************************
* gst_v4lmjpegsrc_set_capture():
* set capture parameters (simple)
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lmjpegsrc_set_capture (GstV4lMjpegSrc *v4lmjpegsrc,
gint decimation,
gint quality)
{
int norm, input, mw;
struct mjpeg_params bparm;
DEBUG("setting decimation = %d, quality = %d",
decimation, quality);
GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lmjpegsrc));
GST_V4L_CHECK_NOT_ACTIVE(GST_V4LELEMENT(v4lmjpegsrc));
gst_v4l_get_chan_norm(GST_V4LELEMENT(v4lmjpegsrc), &input, &norm);
/* Query params for capture */
if (ioctl(GST_V4LELEMENT(v4lmjpegsrc)->video_fd, MJPIOC_G_PARAMS, &bparm) < 0)
{
gst_element_error(GST_ELEMENT(v4lmjpegsrc),
"Error getting video parameters: %s",
g_strerror(errno));
return FALSE;
}
bparm.decimation = decimation;
bparm.quality = quality;
bparm.norm = norm;
bparm.input = input;
bparm.APP_len = 0; /* no JPEG markers - TODO: this is definately not right for decimation==1 */
mw = GST_V4LELEMENT(v4lmjpegsrc)->vcap.maxwidth;
if (mw != 768 && mw != 640)
{
if (decimation == 1)
mw = 720;
else
mw = 704;
}
v4lmjpegsrc->end_width = mw / decimation;
v4lmjpegsrc->end_height = (norm==VIDEO_MODE_NTSC?480:576) / decimation;
/* TODO: interlacing */
/* Set params for capture */
if (ioctl(GST_V4LELEMENT(v4lmjpegsrc)->video_fd, MJPIOC_S_PARAMS, &bparm) < 0)
{
gst_element_error(GST_ELEMENT(v4lmjpegsrc),
"Error setting video parameters: %s",
g_strerror(errno));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4lmjpegsrc_set_capture_m():
* set capture parameters (advanced)
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean gst_v4lmjpegsrc_set_capture_m (GstV4lMjpegSrc *v4lmjpegsrc,
gint x_offset,
gint y_offset,
gint width,
gint height,
gint h_decimation,
gint v_decimation,
gint quality)
{
gint norm, input;
gint maxwidth;
struct mjpeg_params bparm;
DEBUG("setting x_offset = %d, y_offset = %d, "
"width = %d, height = %d, h_decimation = %d, v_decimation = %d, quality = %d\n",
x_offset, y_offset, width, height, h_decimation, v_decimation, quality);
GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lmjpegsrc));
GST_V4L_CHECK_NOT_ACTIVE(GST_V4LELEMENT(v4lmjpegsrc));
gst_v4l_get_chan_norm(GST_V4LELEMENT(v4lmjpegsrc), &input, &norm);
if (GST_V4LELEMENT(v4lmjpegsrc)->vcap.maxwidth != 768 &&
GST_V4LELEMENT(v4lmjpegsrc)->vcap.maxwidth != 640)
maxwidth = 720;
else
maxwidth = GST_V4LELEMENT(v4lmjpegsrc)->vcap.maxwidth;
/* Query params for capture */
if (ioctl(GST_V4LELEMENT(v4lmjpegsrc)->video_fd, MJPIOC_G_PARAMS, &bparm) < 0)
{
gst_element_error(GST_ELEMENT(v4lmjpegsrc),
"Error getting video parameters: %s",
g_strerror(errno));
return FALSE;
}
bparm.decimation = 0;
bparm.quality = quality;
bparm.norm = norm;
bparm.input = input;
bparm.APP_len = 0; /* no JPEG markers - TODO: this is definately
* not right for decimation==1 */
if (width <= 0)
{
if (x_offset < 0) x_offset = 0;
width = (maxwidth==720&&h_decimation!=1)?704:maxwidth - 2*x_offset;
}
else
{
if (x_offset < 0)
x_offset = (maxwidth - width)/2;
}
if (height <= 0)
{
if (y_offset < 0) y_offset = 0;
height = (norm==VIDEO_MODE_NTSC)?480:576 - 2*y_offset;
}
else
{
if (y_offset < 0)
y_offset = ((norm==VIDEO_MODE_NTSC)?480:576 - height)/2;
}
if (width + x_offset > maxwidth)
{
gst_element_error(GST_ELEMENT(v4lmjpegsrc),
"Image width+offset (%d) bigger than maximum (%d)",
width + x_offset, maxwidth);
return FALSE;
}
if ((width%(bparm.HorDcm*16))!=0)
{
gst_element_error(GST_ELEMENT(v4lmjpegsrc),
"Image width (%d) not multiple of %d (required for JPEG)",
width, bparm.HorDcm*16);
return FALSE;
}
if (height + y_offset > (norm==VIDEO_MODE_NTSC ? 480 : 576))
{
gst_element_error(GST_ELEMENT(v4lmjpegsrc),
"Image height+offset (%d) bigger than maximum (%d)",
height + y_offset, (norm==VIDEO_MODE_NTSC ? 480 : 576));
return FALSE;
}
/* RJ: Image height must only be a multiple of 8, but geom_height
* is double the field height
*/
if ((height%(bparm.VerDcm*16))!=0)
{
gst_element_error(GST_ELEMENT(v4lmjpegsrc),
"Image height (%d) not multiple of %d (required for JPEG)",
height, bparm.VerDcm*16);
return FALSE;
}
bparm.img_x = x_offset;
bparm.img_width = width;
bparm.img_y = y_offset;
bparm.img_height = height;
bparm.HorDcm = h_decimation;
bparm.VerDcm = (v_decimation==4) ? 2 : 1;
bparm.TmpDcm = (v_decimation==1) ? 1 : 2;
bparm.field_per_buff = (v_decimation==1) ? 2 : 1;
v4lmjpegsrc->end_width = width / h_decimation;
v4lmjpegsrc->end_width = height / v_decimation;
/* TODO: interlacing */
/* Set params for capture */
if (ioctl(GST_V4LELEMENT(v4lmjpegsrc)->video_fd, MJPIOC_S_PARAMS, &bparm) < 0)
{
gst_element_error(GST_ELEMENT(v4lmjpegsrc),
"Error setting video parameters: %s",
g_strerror(errno));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4lmjpegsrc_capture_init():
* initialize the capture system
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lmjpegsrc_capture_init (GstV4lMjpegSrc *v4lmjpegsrc)
{
DEBUG("initting capture subsystem");
GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lmjpegsrc));
GST_V4L_CHECK_NOT_ACTIVE(GST_V4LELEMENT(v4lmjpegsrc));
/* Request buffers */
if (ioctl(GST_V4LELEMENT(v4lmjpegsrc)->video_fd,
MJPIOC_REQBUFS, &(v4lmjpegsrc->breq)) < 0)
{
gst_element_error(GST_ELEMENT(v4lmjpegsrc),
"Error requesting video buffers: %s",
g_strerror(errno));
return FALSE;
}
if (v4lmjpegsrc->breq.count < MIN_BUFFERS_QUEUED)
{
gst_element_error(GST_ELEMENT(v4lmjpegsrc),
"Too little buffers. We got %d, we want at least %d",
v4lmjpegsrc->breq.count, MIN_BUFFERS_QUEUED);
return FALSE;
}
gst_info("Got %ld buffers of size %ld KB\n",
v4lmjpegsrc->breq.count, v4lmjpegsrc->breq.size/1024);
/* keep track of queued buffers */
v4lmjpegsrc->frame_queue_state = (gint8 *)
g_malloc(sizeof(gint8) * v4lmjpegsrc->breq.count);
/* track how often to use each frame */
v4lmjpegsrc->use_num_times = (gint *)
g_malloc(sizeof(gint) * v4lmjpegsrc->breq.count);
/* lock for the frame_state */
v4lmjpegsrc->mutex_queue_state = g_mutex_new();
v4lmjpegsrc->cond_queue_state = g_cond_new();
/* Map the buffers */
GST_V4LELEMENT(v4lmjpegsrc)->buffer = mmap(0,
v4lmjpegsrc->breq.count * v4lmjpegsrc->breq.size,
PROT_READ|PROT_WRITE, MAP_SHARED, GST_V4LELEMENT(v4lmjpegsrc)->video_fd, 0);
if (GST_V4LELEMENT(v4lmjpegsrc)->buffer == MAP_FAILED)
{
gst_element_error(GST_ELEMENT(v4lmjpegsrc),
"Error mapping video buffers: %s",
g_strerror(errno));
GST_V4LELEMENT(v4lmjpegsrc)->buffer = NULL;
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4lmjpegsrc_capture_start():
* start streaming capture
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lmjpegsrc_capture_start (GstV4lMjpegSrc *v4lmjpegsrc)
{
int n;
DEBUG("starting capture");
GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lmjpegsrc));
GST_V4L_CHECK_ACTIVE(GST_V4LELEMENT(v4lmjpegsrc));
g_mutex_lock(v4lmjpegsrc->mutex_queue_state);
v4lmjpegsrc->quit = FALSE;
v4lmjpegsrc->num_queued = 0;
v4lmjpegsrc->queue_frame = 0;
/* set all buffers ready to queue , this starts streaming capture */
for (n=0;n<v4lmjpegsrc->breq.count;n++) {
v4lmjpegsrc->frame_queue_state[n] = QUEUE_STATE_READY_FOR_QUEUE;
if (!gst_v4lmjpegsrc_queue_frame(v4lmjpegsrc, n)) {
g_mutex_unlock(v4lmjpegsrc->mutex_queue_state);
gst_v4lmjpegsrc_capture_stop(v4lmjpegsrc);
return FALSE;
}
}
g_mutex_unlock(v4lmjpegsrc->mutex_queue_state);
return TRUE;
}
/******************************************************
* gst_v4lmjpegsrc_grab_frame():
* grab one frame during streaming capture
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lmjpegsrc_grab_frame (GstV4lMjpegSrc *v4lmjpegsrc,
gint *num,
gint *size)
{
DEBUG("grabbing frame");
GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lmjpegsrc));
GST_V4L_CHECK_ACTIVE(GST_V4LELEMENT(v4lmjpegsrc));
g_mutex_lock(v4lmjpegsrc->mutex_queue_state);
/* do we have enough frames? */
while (v4lmjpegsrc->num_queued < MIN_BUFFERS_QUEUED ||
v4lmjpegsrc->frame_queue_state[v4lmjpegsrc->queue_frame] ==
QUEUE_STATE_READY_FOR_QUEUE) {
while (v4lmjpegsrc->frame_queue_state[v4lmjpegsrc->queue_frame] !=
QUEUE_STATE_READY_FOR_QUEUE &&
!v4lmjpegsrc->quit) {
GST_DEBUG (
"Waiting for frames to become available (%d < %d)",
v4lmjpegsrc->num_queued, MIN_BUFFERS_QUEUED);
g_cond_wait(v4lmjpegsrc->cond_queue_state,
v4lmjpegsrc->mutex_queue_state);
}
if (v4lmjpegsrc->quit) {
g_mutex_unlock(v4lmjpegsrc->mutex_queue_state);
return TRUE; /* it won't get through anyway */
}
if (!gst_v4lmjpegsrc_queue_frame(v4lmjpegsrc, v4lmjpegsrc->queue_frame)) {
g_mutex_unlock(v4lmjpegsrc->mutex_queue_state);
return FALSE;
}
v4lmjpegsrc->queue_frame = (v4lmjpegsrc->queue_frame + 1) % v4lmjpegsrc->breq.count;
}
/* syncing on the buffer grabs it */
if (!gst_v4lmjpegsrc_sync_next_frame(v4lmjpegsrc, num)) {
return FALSE;
}
*size = v4lmjpegsrc->bsync.length;
g_mutex_unlock(v4lmjpegsrc->mutex_queue_state);
return TRUE;
}
/******************************************************
* gst_v4lmjpegsrc_get_buffer():
* get the memory address of a single buffer
* return value: TRUE on success, FALSE on error
******************************************************/
guint8 *
gst_v4lmjpegsrc_get_buffer (GstV4lMjpegSrc *v4lmjpegsrc,
gint num)
{
/*DEBUG("gst_v4lmjpegsrc_get_buffer(), num = %d", num);*/
if (!GST_V4L_IS_ACTIVE(GST_V4LELEMENT(v4lmjpegsrc)) ||
!GST_V4L_IS_OPEN(GST_V4LELEMENT(v4lmjpegsrc)))
return NULL;
if (num < 0 || num >= v4lmjpegsrc->breq.count)
return NULL;
return GST_V4LELEMENT(v4lmjpegsrc)->buffer+(v4lmjpegsrc->breq.size*num);
}
/******************************************************
* gst_v4lmjpegsrc_requeue_frame():
* requeue a frame for capturing
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lmjpegsrc_requeue_frame (GstV4lMjpegSrc *v4lmjpegsrc,
gint num)
{
DEBUG("requeueing frame %d", num);
GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lmjpegsrc));
GST_V4L_CHECK_ACTIVE(GST_V4LELEMENT(v4lmjpegsrc));
/* mark frame as 'ready to requeue' */
g_mutex_lock(v4lmjpegsrc->mutex_queue_state);
if (v4lmjpegsrc->frame_queue_state[num] != QUEUE_STATE_SYNCED) {
gst_element_error(GST_ELEMENT(v4lmjpegsrc),
"Invalid state %d (expected %d), can't requeue",
v4lmjpegsrc->frame_queue_state[num],
QUEUE_STATE_SYNCED);
return FALSE;
}
v4lmjpegsrc->frame_queue_state[num] = QUEUE_STATE_READY_FOR_QUEUE;
/* let an optional wait know */
g_cond_broadcast(v4lmjpegsrc->cond_queue_state);
g_mutex_unlock(v4lmjpegsrc->mutex_queue_state);
return TRUE;
}
/******************************************************
* gst_v4lmjpegsrc_capture_stop():
* stop streaming capture
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lmjpegsrc_capture_stop (GstV4lMjpegSrc *v4lmjpegsrc)
{
int n;
DEBUG("stopping capture");
GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lmjpegsrc));
GST_V4L_CHECK_ACTIVE(GST_V4LELEMENT(v4lmjpegsrc));
g_mutex_lock(v4lmjpegsrc->mutex_queue_state);
/* make an optional pending wait stop */
v4lmjpegsrc->quit = TRUE;
g_cond_broadcast(v4lmjpegsrc->cond_queue_state);
/* sync on remaining frames */
while (v4lmjpegsrc->num_queued > 0) {
gst_v4lmjpegsrc_sync_next_frame(v4lmjpegsrc, &n);
}
g_mutex_unlock(v4lmjpegsrc->mutex_queue_state);
return TRUE;
}
/******************************************************
* gst_v4lmjpegsrc_capture_deinit():
* deinitialize the capture system
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lmjpegsrc_capture_deinit (GstV4lMjpegSrc *v4lmjpegsrc)
{
DEBUG("quitting capture subsystem");
GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lmjpegsrc));
GST_V4L_CHECK_ACTIVE(GST_V4LELEMENT(v4lmjpegsrc));
/* unmap the buffer */
munmap(GST_V4LELEMENT(v4lmjpegsrc)->buffer, v4lmjpegsrc->breq.size * v4lmjpegsrc->breq.count);
GST_V4LELEMENT(v4lmjpegsrc)->buffer = NULL;
/* free buffer tracker */
g_mutex_free(v4lmjpegsrc->mutex_queue_state);
g_cond_free(v4lmjpegsrc->cond_queue_state);
g_free(v4lmjpegsrc->frame_queue_state);
g_free(v4lmjpegsrc->use_num_times);
return TRUE;
}
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