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526 lines
15 KiB
C
526 lines
15 KiB
C
/* G-Streamer BT8x8/V4L frame grabber plugin
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* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <string.h>
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#include <errno.h>
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#include "v4lsrc_calls.h"
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#include <sys/time.h>
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/* number of buffers to be queued *at least* before syncing */
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#define MIN_BUFFERS_QUEUED 2
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/* On some systems MAP_FAILED seems to be missing */
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#ifndef MAP_FAILED
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#define MAP_FAILED ( (caddr_t) -1 )
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#endif
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#define DEBUG(format, args...) \
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GST_DEBUG_OBJECT (\
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GST_ELEMENT(v4lsrc), \
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"V4LSRC: " format, ##args)
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/* palette names */
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static const char *palette_name[] = {
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"", /* 0 */
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"grayscale", /* VIDEO_PALETTE_GREY */
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"Hi-420", /* VIDEO_PALETTE_HI420 */
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"16-bit RGB (RGB-565)", /* VIDEO_PALETTE_RB565 */
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"24-bit RGB", /* VIDEO_PALETTE_RGB24 */
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"32-bit RGB", /* VIDEO_PALETTE_RGB32 */
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"15-bit RGB (RGB-555)", /* VIDEO_PALETTE_RGB555 */
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"YUV-4:2:2 (packed)", /* VIDEO_PALETTE_YUV422 */
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"YUYV", /* VIDEO_PALETTE_YUYV */
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"UYVY", /* VIDEO_PALETTE_UYVY */
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"YUV-4:2:0 (packed)", /* VIDEO_PALETTE_YUV420 */
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"YUV-4:1:1 (packed)", /* VIDEO_PALETTE_YUV411 */
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"Raw", /* VIDEO_PALETTE_RAW */
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"YUV-4:2:2 (planar)", /* VIDEO_PALETTE_YUV422P */
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"YUV-4:1:1 (planar)", /* VIDEO_PALETTE_YUV411P */
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"YUV-4:2:0 (planar)", /* VIDEO_PALETTE_YUV420P */
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"YUV-4:1:0 (planar)" /* VIDEO_PALETTE_YUV410P */
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};
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enum {
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QUEUE_STATE_ERROR = -1,
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QUEUE_STATE_READY_FOR_QUEUE,
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QUEUE_STATE_QUEUED,
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QUEUE_STATE_SYNCED,
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};
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/******************************************************
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* gst_v4lsrc_queue_frame():
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* queue a frame for capturing
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* Requires queue_state lock to be held!
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* return value: TRUE on success, FALSE on error
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******************************************************/
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static gboolean
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gst_v4lsrc_queue_frame (GstV4lSrc *v4lsrc,
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gint num)
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{
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DEBUG("queueing frame %d", num);
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if (v4lsrc->frame_queue_state[num] != QUEUE_STATE_READY_FOR_QUEUE) {
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return FALSE;
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}
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v4lsrc->mmap.frame = num;
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if (ioctl(GST_V4LELEMENT(v4lsrc)->video_fd,
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VIDIOCMCAPTURE, &(v4lsrc->mmap)) < 0)
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{
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gst_element_error(GST_ELEMENT(v4lsrc),
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"Error queueing a buffer (%d): %s",
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num, g_strerror(errno));
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return FALSE;
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}
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v4lsrc->frame_queue_state[num] = QUEUE_STATE_QUEUED;
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v4lsrc->num_queued++;
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return TRUE;
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}
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/******************************************************
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* gst_v4lsrc_hard_sync_frame(GstV4lSrc *v4lsrc,gint num)
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* sync a frame and set the timestamp correctly
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* Requires queue_state lock to be held
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*****************************************************/
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static gboolean
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gst_v4lsrc_sync_frame (GstV4lSrc *v4lsrc, gint num)
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{
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DEBUG("Syncing on frame %d",num);
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if (v4lsrc->frame_queue_state[num] != QUEUE_STATE_QUEUED) {
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return FALSE;
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}
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while (ioctl(GST_V4LELEMENT(v4lsrc)->video_fd, VIDIOCSYNC, &num) < 0) {
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/* if the sync() got interrupted, we can retry */
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if (errno != EINTR) {
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v4lsrc->frame_queue_state[num] = QUEUE_STATE_ERROR;
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gst_element_error(GST_ELEMENT(v4lsrc),
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"Error syncing on a buffer (%d): %s",
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num, g_strerror(errno));
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return FALSE;
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}
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DEBUG("Sync got interrupted");
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}
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if (v4lsrc->clock) {
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v4lsrc->timestamp_sync = gst_clock_get_time(v4lsrc->clock);
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} else {
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GTimeVal time;
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g_get_current_time(&time);
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v4lsrc->timestamp_sync = GST_TIMEVAL_TO_TIME(time);
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}
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v4lsrc->frame_queue_state[num] = QUEUE_STATE_SYNCED;
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v4lsrc->num_queued--;
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return TRUE;
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}
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/******************************************************
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* gst_v4lsrc_set_capture():
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* set capture parameters, palette = VIDEO_PALETTE_*
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* return value: TRUE on success, FALSE on error
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******************************************************/
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gboolean
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gst_v4lsrc_set_capture (GstV4lSrc *v4lsrc,
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gint width,
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gint height,
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gint palette)
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{
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DEBUG("capture properties set to width = %d, height = %d, palette = %d",
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width, height, palette);
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/*GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lsrc));*/
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/*GST_V4L_CHECK_NOT_ACTIVE(GST_V4LELEMENT(v4lsrc));*/
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v4lsrc->mmap.width = width;
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v4lsrc->mmap.height = height;
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v4lsrc->mmap.format = palette;
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return TRUE;
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}
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/******************************************************
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* gst_v4lsrc_capture_init():
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* initialize the capture system
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* return value: TRUE on success, FALSE on error
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******************************************************/
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gboolean
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gst_v4lsrc_capture_init (GstV4lSrc *v4lsrc)
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{
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DEBUG("initting capture subsystem");
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GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lsrc));
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GST_V4L_CHECK_NOT_ACTIVE(GST_V4LELEMENT(v4lsrc));
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/* request buffer info */
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if (ioctl(GST_V4LELEMENT(v4lsrc)->video_fd, VIDIOCGMBUF, &(v4lsrc->mbuf)) < 0)
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{
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gst_element_error(GST_ELEMENT(v4lsrc),
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"Error getting buffer information: %s",
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g_strerror(errno));
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return FALSE;
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}
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if (v4lsrc->mbuf.frames < MIN_BUFFERS_QUEUED)
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{
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gst_element_error(GST_ELEMENT(v4lsrc),
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"Too little buffers. We got %d, we want at least %d",
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v4lsrc->mbuf.frames, MIN_BUFFERS_QUEUED);
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return FALSE;
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}
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gst_info("Got %d buffers (\'%s\') of size %d KB\n",
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v4lsrc->mbuf.frames, palette_name[v4lsrc->mmap.format],
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v4lsrc->mbuf.size/(v4lsrc->mbuf.frames*1024));
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/* keep track of queued buffers */
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v4lsrc->frame_queue_state = (gint8 *)
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g_malloc(sizeof(gint8) * v4lsrc->mbuf.frames);
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/* track how often to use each frame */
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v4lsrc->use_num_times = (gint *)
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g_malloc(sizeof(gint) * v4lsrc->mbuf.frames);
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/* lock for the frame_state */
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v4lsrc->mutex_queue_state = g_mutex_new();
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v4lsrc->cond_queue_state = g_cond_new();
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/* Map the buffers */
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GST_V4LELEMENT(v4lsrc)->buffer = mmap(0, v4lsrc->mbuf.size,
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PROT_READ|PROT_WRITE, MAP_SHARED, GST_V4LELEMENT(v4lsrc)->video_fd, 0);
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if (GST_V4LELEMENT(v4lsrc)->buffer == MAP_FAILED)
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{
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gst_element_error(GST_ELEMENT(v4lsrc),
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"Error mapping video buffers: %s",
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g_strerror(errno));
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GST_V4LELEMENT(v4lsrc)->buffer = NULL;
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return FALSE;
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}
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return TRUE;
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}
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/******************************************************
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* gst_v4lsrc_capture_start():
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* start streaming capture
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* return value: TRUE on success, FALSE on error
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******************************************************/
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gboolean
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gst_v4lsrc_capture_start (GstV4lSrc *v4lsrc)
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{
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int n;
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DEBUG("starting capture");
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GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lsrc));
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GST_V4L_CHECK_ACTIVE(GST_V4LELEMENT(v4lsrc));
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g_mutex_lock(v4lsrc->mutex_queue_state);
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v4lsrc->quit = FALSE;
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v4lsrc->num_queued = 0;
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v4lsrc->sync_frame = 0;
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v4lsrc->queue_frame = 0;
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/* set all buffers ready to queue , this starts streaming capture */
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for (n=0;n<v4lsrc->mbuf.frames;n++) {
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v4lsrc->frame_queue_state[n] = QUEUE_STATE_READY_FOR_QUEUE;
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if (!gst_v4lsrc_queue_frame(v4lsrc, n)) {
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g_mutex_unlock(v4lsrc->mutex_queue_state);
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gst_v4lsrc_capture_stop(v4lsrc);
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return FALSE;
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}
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}
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g_mutex_unlock(v4lsrc->mutex_queue_state);
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return TRUE;
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}
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/******************************************************
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* gst_v4lsrc_grab_frame():
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* capture one frame during streaming capture
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* return value: TRUE on success, FALSE on error
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******************************************************/
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gboolean
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gst_v4lsrc_grab_frame (GstV4lSrc *v4lsrc, gint *num)
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{
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DEBUG("grabbing frame");
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GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lsrc));
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GST_V4L_CHECK_ACTIVE(GST_V4LELEMENT(v4lsrc));
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g_mutex_lock(v4lsrc->mutex_queue_state);
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/* do we have enough frames? */
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while (v4lsrc->num_queued < MIN_BUFFERS_QUEUED ||
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v4lsrc->frame_queue_state[v4lsrc->queue_frame] ==
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QUEUE_STATE_READY_FOR_QUEUE) {
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while (v4lsrc->frame_queue_state[v4lsrc->queue_frame] !=
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QUEUE_STATE_READY_FOR_QUEUE &&
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!v4lsrc->quit) {
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GST_DEBUG (
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"Waiting for frames to become available (%d < %d)",
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v4lsrc->num_queued, MIN_BUFFERS_QUEUED);
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g_cond_wait(v4lsrc->cond_queue_state,
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v4lsrc->mutex_queue_state);
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}
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if (v4lsrc->quit) {
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g_mutex_unlock(v4lsrc->mutex_queue_state);
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return TRUE; /* it won't get through anyway */
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}
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if (!gst_v4lsrc_queue_frame(v4lsrc, v4lsrc->queue_frame)) {
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g_mutex_unlock(v4lsrc->mutex_queue_state);
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return FALSE;
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}
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v4lsrc->queue_frame = (v4lsrc->queue_frame + 1) % v4lsrc->mbuf.frames;
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}
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/* syncing on the buffer grabs it */
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*num = v4lsrc->sync_frame;
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if (!gst_v4lsrc_sync_frame(v4lsrc, *num)) {
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g_mutex_unlock(v4lsrc->mutex_queue_state);
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return FALSE;
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}
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v4lsrc->sync_frame = (v4lsrc->sync_frame + 1) % v4lsrc->mbuf.frames;
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g_mutex_unlock(v4lsrc->mutex_queue_state);
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return TRUE;
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}
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/******************************************************
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* gst_v4lsrc_get_buffer():
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* get the address of the just-capture buffer
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* return value: the buffer's address or NULL
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******************************************************/
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guint8 *
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gst_v4lsrc_get_buffer (GstV4lSrc *v4lsrc, gint num)
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{
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if (!GST_V4L_IS_ACTIVE(GST_V4LELEMENT(v4lsrc)) ||
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!GST_V4L_IS_OPEN(GST_V4LELEMENT(v4lsrc)))
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return NULL;
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if (num < 0 || num >= v4lsrc->mbuf.frames)
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return NULL;
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return GST_V4LELEMENT(v4lsrc)->buffer+v4lsrc->mbuf.offsets[num];
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}
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/******************************************************
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* gst_v4lsrc_requeue_frame():
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* re-queue a frame after we're done with the buffer
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* return value: TRUE on success, FALSE on error
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******************************************************/
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gboolean
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gst_v4lsrc_requeue_frame (GstV4lSrc *v4lsrc, gint num)
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{
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DEBUG("requeueing frame %d", num);
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GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lsrc));
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GST_V4L_CHECK_ACTIVE(GST_V4LELEMENT(v4lsrc));
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/* mark frame as 'ready to requeue' */
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g_mutex_lock(v4lsrc->mutex_queue_state);
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if (v4lsrc->frame_queue_state[num] != QUEUE_STATE_SYNCED) {
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gst_element_error(GST_ELEMENT(v4lsrc),
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"Invalid state %d (expected %d), can't requeue",
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v4lsrc->frame_queue_state[num],
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QUEUE_STATE_SYNCED);
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return FALSE;
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}
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v4lsrc->frame_queue_state[num] = QUEUE_STATE_READY_FOR_QUEUE;
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/* let an optional wait know */
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g_cond_broadcast(v4lsrc->cond_queue_state);
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g_mutex_unlock(v4lsrc->mutex_queue_state);
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return TRUE;
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}
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/******************************************************
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* gst_v4lsrc_capture_stop():
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* stop streaming capture
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* return value: TRUE on success, FALSE on error
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******************************************************/
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gboolean
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gst_v4lsrc_capture_stop (GstV4lSrc *v4lsrc)
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{
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DEBUG("stopping capture");
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GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lsrc));
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GST_V4L_CHECK_ACTIVE(GST_V4LELEMENT(v4lsrc));
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g_mutex_lock(v4lsrc->mutex_queue_state);
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/* make an optional pending wait stop */
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v4lsrc->quit = TRUE;
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g_cond_broadcast(v4lsrc->cond_queue_state);
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/* sync on remaining frames */
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while (1) {
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if (v4lsrc->frame_queue_state[v4lsrc->sync_frame] == QUEUE_STATE_QUEUED) {
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gst_v4lsrc_sync_frame(v4lsrc, v4lsrc->sync_frame);
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v4lsrc->sync_frame = (v4lsrc->sync_frame + 1) % v4lsrc->mbuf.frames;
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} else {
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break;
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}
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}
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g_mutex_unlock(v4lsrc->mutex_queue_state);
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return TRUE;
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}
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/******************************************************
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* gst_v4lsrc_capture_deinit():
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* deinitialize the capture system
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* return value: TRUE on success, FALSE on error
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******************************************************/
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gboolean
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gst_v4lsrc_capture_deinit (GstV4lSrc *v4lsrc)
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{
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DEBUG("quitting capture subsystem");
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GST_V4L_CHECK_OPEN(GST_V4LELEMENT(v4lsrc));
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GST_V4L_CHECK_ACTIVE(GST_V4LELEMENT(v4lsrc));
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/* free buffer tracker */
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g_mutex_free(v4lsrc->mutex_queue_state);
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g_cond_free(v4lsrc->cond_queue_state);
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g_free(v4lsrc->frame_queue_state);
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g_free(v4lsrc->use_num_times);
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/* unmap the buffer */
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munmap(GST_V4LELEMENT(v4lsrc)->buffer, v4lsrc->mbuf.size);
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GST_V4LELEMENT(v4lsrc)->buffer = NULL;
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return TRUE;
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}
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/******************************************************
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* gst_v4lsrc_try_palette():
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* try out a palette on the device
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* This has to be done before initializing the
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* actual capture system, to make sure we don't
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* mess up anything. So we need to mini-mmap()
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* a buffer here, queue and sync on one buffer,
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* and unmap it.
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* This is ugly, yes, I know - but it's a major
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* design flaw of v4l1 that you don't know in
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* advance which formats will be supported...
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* This is better than "just assuming that it'll
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* work"...
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* return value: TRUE on success, FALSE on error
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******************************************************/
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gboolean
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gst_v4lsrc_try_palette (GstV4lSrc *v4lsrc,
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gint palette)
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{
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/* so, we need a buffer and some more stuff */
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int frame = 0;
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guint8 *buffer;
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struct video_mbuf vmbuf;
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struct video_mmap vmmap;
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DEBUG("gonna try out palette format %d (%s)",
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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;
|
|
}
|
|
|