gstreamer/sys/v4l/v4lmjpegsink_calls.c

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/* G-Streamer hardware MJPEG video sink 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 <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 "v4lmjpegsink_calls.h"
/* 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_OBJECT (\
GST_ELEMENT(v4lmjpegsink), \
"V4LMJPEGSINK: " format, ##args)
/******************************************************
* gst_v4lmjpegsink_sync_thread()
* thread keeps track of played frames
******************************************************/
static void *
gst_v4lmjpegsink_sync_thread (void *arg)
{
GstV4lMjpegSink *v4lmjpegsink = GST_V4LMJPEGSINK (arg);
gint frame = 0; /* frame that we're currently syncing on */
DEBUG ("starting sync thread");
#if 0
/* Allow easy shutting down by other processes... */
pthread_setcancelstate (PTHREAD_CANCEL_ENABLE, NULL);
pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
#endif
while (1) {
g_mutex_lock (v4lmjpegsink->mutex_queued_frames);
if (!v4lmjpegsink->isqueued_queued_frames[frame]) {
g_cond_wait (v4lmjpegsink->cond_queued_frames[frame],
v4lmjpegsink->mutex_queued_frames);
}
if (v4lmjpegsink->isqueued_queued_frames[frame] != 1) {
g_mutex_unlock (v4lmjpegsink->mutex_queued_frames);
goto end;
}
g_mutex_unlock (v4lmjpegsink->mutex_queued_frames);
DEBUG ("thread-syncing on next frame");
if (ioctl (GST_V4LELEMENT (v4lmjpegsink)->video_fd, MJPIOC_SYNC,
&(v4lmjpegsink->bsync)) < 0) {
GST_ELEMENT_ERROR (v4lmjpegsink, RESOURCE, SYNC, (NULL),
("Failed to sync on frame %d: %s", frame, g_strerror (errno)));
g_mutex_lock (v4lmjpegsink->mutex_queued_frames);
v4lmjpegsink->isqueued_queued_frames[frame] = -1;
g_cond_broadcast (v4lmjpegsink->cond_queued_frames[frame]);
g_mutex_unlock (v4lmjpegsink->mutex_queued_frames);
goto end;
} else {
/* be sure that we're not confusing */
if (frame != v4lmjpegsink->bsync.frame) {
GST_ELEMENT_ERROR (v4lmjpegsink, CORE, TOO_LAZY, (NULL),
("Internal error: frame number confusion"));
goto end;
}
g_mutex_lock (v4lmjpegsink->mutex_queued_frames);
v4lmjpegsink->isqueued_queued_frames[frame] = 0;
g_cond_broadcast (v4lmjpegsink->cond_queued_frames[frame]);
g_mutex_unlock (v4lmjpegsink->mutex_queued_frames);
}
frame = (frame + 1) % v4lmjpegsink->breq.count;
}
end:
DEBUG ("Sync thread got signalled to exit");
g_thread_exit (NULL);
return NULL;
}
/******************************************************
* gst_v4lmjpegsink_queue_frame()
* queue a frame for playback
* return value: TRUE on success, FALSE on error
******************************************************/
static gboolean
gst_v4lmjpegsink_queue_frame (GstV4lMjpegSink * v4lmjpegsink, gint num)
{
DEBUG ("queueing frame %d", num);
/* queue on this frame */
if (ioctl (GST_V4LELEMENT (v4lmjpegsink)->video_fd, MJPIOC_QBUF_PLAY,
&num) < 0) {
GST_ELEMENT_ERROR (v4lmjpegsink, RESOURCE, WRITE, (NULL),
("Failed to queue frame %d: %s", num, g_strerror (errno)));
return FALSE;
}
g_mutex_lock (v4lmjpegsink->mutex_queued_frames);
v4lmjpegsink->isqueued_queued_frames[num] = 1;
g_cond_broadcast (v4lmjpegsink->cond_queued_frames[num]);
g_mutex_unlock (v4lmjpegsink->mutex_queued_frames);
return TRUE;
}
/******************************************************
* gst_v4lmjpegsink_sync_frame()
* wait for a frame to be finished playing
* return value: TRUE on success, FALSE on error
******************************************************/
static gboolean
gst_v4lmjpegsink_sync_frame (GstV4lMjpegSink * v4lmjpegsink, gint * num)
{
DEBUG ("syncing on next frame");
/* calculate next frame */
v4lmjpegsink->current_frame =
(v4lmjpegsink->current_frame + 1) % v4lmjpegsink->breq.count;
*num = v4lmjpegsink->current_frame;
g_mutex_lock (v4lmjpegsink->mutex_queued_frames);
if (v4lmjpegsink->isqueued_queued_frames[*num] == 1) {
g_cond_wait (v4lmjpegsink->cond_queued_frames[*num],
v4lmjpegsink->mutex_queued_frames);
}
if (v4lmjpegsink->isqueued_queued_frames[*num] != 0) {
g_mutex_unlock (v4lmjpegsink->mutex_queued_frames);
return FALSE;
} else
g_mutex_unlock (v4lmjpegsink->mutex_queued_frames);
return TRUE;
}
/******************************************************
* gst_v4lmjpegsink_set_buffer()
* set buffer options
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lmjpegsink_set_buffer (GstV4lMjpegSink * v4lmjpegsink,
gint numbufs, gint bufsize)
{
DEBUG ("setting buffer info to numbufs = %d, bufsize = %d KB",
numbufs, bufsize);
GST_V4L_CHECK_OPEN (GST_V4LELEMENT (v4lmjpegsink));
GST_V4L_CHECK_NOT_ACTIVE (GST_V4LELEMENT (v4lmjpegsink));
v4lmjpegsink->breq.size = bufsize * 1024;
v4lmjpegsink->breq.count = numbufs;
return TRUE;
}
/******************************************************
* gst_v4lmjpegsink_set_playback()
* set playback options (video, interlacing, etc.)
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lmjpegsink_set_playback (GstV4lMjpegSink * v4lmjpegsink,
gint width,
gint height, gint x_offset, gint y_offset, gint norm, gint interlacing)
{
gint mw, mh;
struct mjpeg_params bparm;
DEBUG
("setting size = %dx%d, X/Y-offsets = %d/%d, norm = %d, interlacing = %d\n",
width, height, x_offset, y_offset, norm, interlacing);
GST_V4L_CHECK_OPEN (GST_V4LELEMENT (v4lmjpegsink));
/*GST_V4L_CHECK_NOT_ACTIVE(GST_V4LELEMENT(v4lmjpegsink)); */
if (ioctl (GST_V4LELEMENT (v4lmjpegsink)->video_fd, MJPIOC_G_PARAMS,
&bparm) < 0) {
GST_ELEMENT_ERROR (v4lmjpegsink, RESOURCE, SETTINGS, (NULL),
GST_ERROR_SYSTEM);
return FALSE;
}
bparm.input = 0;
bparm.norm = norm;
bparm.decimation = 0; /* we'll set proper values later on */
/* maxwidth is broken on marvel cards */
mw = GST_V4LELEMENT (v4lmjpegsink)->vcap.maxwidth;
if (mw != 768 && mw != 640)
mw = 720;
mh = (norm == VIDEO_MODE_NTSC ? 480 : 576);
if (width > mw || height > mh) {
GST_ELEMENT_ERROR (v4lmjpegsink, RESOURCE, TOO_LAZY, (NULL),
("Video dimensions (%dx%d) are larger than device max (%dx%d)",
width, height, mw, mh));
return FALSE;
}
if (width <= mw / 4)
bparm.HorDcm = 4;
else if (width <= mw / 2)
bparm.HorDcm = 2;
else
bparm.HorDcm = 1;
/* TODO: add proper interlacing handling */
#if 0
if (interlacing != INTERLACING_NOT_INTERLACED) {
bparm.field_per_buff = 2;
bparm.TmpDcm = 1;
if (height <= mh / 2)
bparm.VerDcm = 2;
else
bparm.VerDcm = 1;
} else
#endif
{
if (height > mh / 2) {
GST_ELEMENT_ERROR (v4lmjpegsink, RESOURCE, TOO_LAZY, (NULL),
("Video dimensions (%dx%d) too large for non-interlaced playback (%dx%d)",
width, height, mw, mh / 2));
return FALSE;
}
bparm.field_per_buff = 1;
bparm.TmpDcm = 2;
if (height <= mh / 4)
bparm.VerDcm = 2;
else
bparm.VerDcm = 1;
}
/* TODO: add proper interlacing handling */
#if 0
bparm.odd_even = (interlacing == INTERLACING_TOP_FIRST);
#endif
bparm.quality = 100;
bparm.img_width = bparm.HorDcm * width;
bparm.img_height = bparm.VerDcm * height / bparm.field_per_buff;
/* image X/Y offset on device */
if (x_offset < 0)
bparm.img_x = (mw - bparm.img_width) / 2;
else {
if (x_offset + bparm.img_width > mw)
bparm.img_x = mw - bparm.img_width;
else
bparm.img_x = x_offset;
}
if (y_offset < 0)
bparm.img_y = (mh / 2 - bparm.img_height) / 2;
else {
if (y_offset + bparm.img_height * 2 > mh)
bparm.img_y = mh / 2 - bparm.img_height;
else
bparm.img_y = y_offset / 2;
}
if (ioctl (GST_V4LELEMENT (v4lmjpegsink)->video_fd, MJPIOC_S_PARAMS,
&bparm) < 0) {
GST_ELEMENT_ERROR (v4lmjpegsink, RESOURCE, SETTINGS, (NULL),
GST_ERROR_SYSTEM);
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4lmjpegsink_playback_init()
* initialize playback system, set up buffer, etc.
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lmjpegsink_playback_init (GstV4lMjpegSink * v4lmjpegsink)
{
gint n;
DEBUG ("initting playback subsystem");
GST_V4L_CHECK_OPEN (GST_V4LELEMENT (v4lmjpegsink));
GST_V4L_CHECK_NOT_ACTIVE (GST_V4LELEMENT (v4lmjpegsink));
/* Request buffers */
if (ioctl (GST_V4LELEMENT (v4lmjpegsink)->video_fd, MJPIOC_REQBUFS,
&(v4lmjpegsink->breq)) < 0) {
GST_ELEMENT_ERROR (v4lmjpegsink, RESOURCE, READ, (NULL), GST_ERROR_SYSTEM);
return FALSE;
}
gst_info ("Got %ld buffers of size %ld KB\n",
v4lmjpegsink->breq.count, v4lmjpegsink->breq.size / 1024);
/* Map the buffers */
GST_V4LELEMENT (v4lmjpegsink)->buffer = mmap (0,
v4lmjpegsink->breq.count * v4lmjpegsink->breq.size,
PROT_READ | PROT_WRITE, MAP_SHARED,
GST_V4LELEMENT (v4lmjpegsink)->video_fd, 0);
if (GST_V4LELEMENT (v4lmjpegsink)->buffer == MAP_FAILED) {
GST_ELEMENT_ERROR (v4lmjpegsink, RESOURCE, TOO_LAZY, (NULL),
("Error mapping video buffers: %s", g_strerror (errno)));
GST_V4LELEMENT (v4lmjpegsink)->buffer = NULL;
return FALSE;
}
/* allocate/init the GThread thingies */
v4lmjpegsink->mutex_queued_frames = g_mutex_new ();
v4lmjpegsink->isqueued_queued_frames = (gint8 *)
malloc (sizeof (gint8) * v4lmjpegsink->breq.count);
if (!v4lmjpegsink->isqueued_queued_frames) {
GST_ELEMENT_ERROR (v4lmjpegsink, RESOURCE, TOO_LAZY, (NULL),
("Failed to create queue tracker: %s", g_strerror (errno)));
return FALSE;
}
v4lmjpegsink->cond_queued_frames = (GCond **)
malloc (sizeof (GCond *) * v4lmjpegsink->breq.count);
if (!v4lmjpegsink->cond_queued_frames) {
GST_ELEMENT_ERROR (v4lmjpegsink, RESOURCE, TOO_LAZY, (NULL),
("Failed to create queue condition holders: %s", g_strerror (errno)));
return FALSE;
}
for (n = 0; n < v4lmjpegsink->breq.count; n++)
v4lmjpegsink->cond_queued_frames[n] = g_cond_new ();
return TRUE;
}
/******************************************************
* gst_v4lmjpegsink_playback_start()
* start playback system
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lmjpegsink_playback_start (GstV4lMjpegSink * v4lmjpegsink)
{
GError *error;
gint n;
DEBUG ("starting playback");
GST_V4L_CHECK_OPEN (GST_V4LELEMENT (v4lmjpegsink));
GST_V4L_CHECK_ACTIVE (GST_V4LELEMENT (v4lmjpegsink));
/* mark all buffers as unqueued */
for (n = 0; n < v4lmjpegsink->breq.count; n++)
v4lmjpegsink->isqueued_queued_frames[n] = 0;
v4lmjpegsink->current_frame = -1;
/* create sync() thread */
v4lmjpegsink->thread_queued_frames =
g_thread_create (gst_v4lmjpegsink_sync_thread, (void *) v4lmjpegsink,
TRUE, &error);
if (!v4lmjpegsink->thread_queued_frames) {
GST_ELEMENT_ERROR (v4lmjpegsink, RESOURCE, TOO_LAZY, (NULL),
("Failed to create sync thread: %s", error->message));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4lmjpegsink_get_buffer()
* get address of a buffer
* return value: buffer's address or NULL
******************************************************/
guint8 *
gst_v4lmjpegsink_get_buffer (GstV4lMjpegSink * v4lmjpegsink, gint num)
{
/*DEBUG("gst_v4lmjpegsink_get_buffer(), num = %d", num); */
if (!GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lmjpegsink)) ||
!GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lmjpegsink)))
return NULL;
if (num < 0 || num >= v4lmjpegsink->breq.count)
return NULL;
return GST_V4LELEMENT (v4lmjpegsink)->buffer +
(v4lmjpegsink->breq.size * num);
}
/******************************************************
* gst_v4lmjpegsink_play_frame()
* queue a new buffer
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lmjpegsink_play_frame (GstV4lMjpegSink * v4lmjpegsink, gint num)
{
DEBUG ("playing frame %d", num);
GST_V4L_CHECK_OPEN (GST_V4LELEMENT (v4lmjpegsink));
GST_V4L_CHECK_ACTIVE (GST_V4LELEMENT (v4lmjpegsink));
if (!gst_v4lmjpegsink_queue_frame (v4lmjpegsink, num))
return FALSE;
return TRUE;
}
/******************************************************
* gst_v4lmjpegsink_wait_frame()
* wait for buffer to be actually played
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lmjpegsink_wait_frame (GstV4lMjpegSink * v4lmjpegsink, gint * num)
{
DEBUG ("waiting for next frame to be finished playing");
GST_V4L_CHECK_OPEN (GST_V4LELEMENT (v4lmjpegsink));
GST_V4L_CHECK_ACTIVE (GST_V4LELEMENT (v4lmjpegsink));
if (!gst_v4lmjpegsink_sync_frame (v4lmjpegsink, num))
return FALSE;
return TRUE;
}
/******************************************************
* gst_v4lmjpegsink_playback_stop()
* stop playback system and sync on remaining frames
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lmjpegsink_playback_stop (GstV4lMjpegSink * v4lmjpegsink)
{
gint num;
DEBUG ("stopping playback");
GST_V4L_CHECK_OPEN (GST_V4LELEMENT (v4lmjpegsink));
GST_V4L_CHECK_ACTIVE (GST_V4LELEMENT (v4lmjpegsink));
/* mark next buffer as wrong */
if (!gst_v4lmjpegsink_sync_frame (v4lmjpegsink, &num) ||
!gst_v4lmjpegsink_queue_frame (v4lmjpegsink, num)) {
return FALSE;
}
/* .. and wait for all buffers to be queued on */
g_thread_join (v4lmjpegsink->thread_queued_frames);
return TRUE;
}
/******************************************************
* gst_v4lmjpegsink_playback_deinit()
* deinitialize the playback system and unmap buffer
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4lmjpegsink_playback_deinit (GstV4lMjpegSink * v4lmjpegsink)
{
int n;
DEBUG ("quitting playback subsystem");
GST_V4L_CHECK_OPEN (GST_V4LELEMENT (v4lmjpegsink));
GST_V4L_CHECK_ACTIVE (GST_V4LELEMENT (v4lmjpegsink));
/* free GThread thingies */
g_mutex_free (v4lmjpegsink->mutex_queued_frames);
for (n = 0; n < v4lmjpegsink->breq.count; n++)
g_cond_free (v4lmjpegsink->cond_queued_frames[n]);
free (v4lmjpegsink->cond_queued_frames);
free (v4lmjpegsink->isqueued_queued_frames);
/* unmap the buffer */
munmap (GST_V4LELEMENT (v4lmjpegsink)->buffer,
v4lmjpegsink->breq.size * v4lmjpegsink->breq.count);
GST_V4LELEMENT (v4lmjpegsink)->buffer = NULL;
return TRUE;
}