[Ffmpeg-devel] [patch] *BSD bktr grab support

Jacob Meuser jakemsr
Wed Jun 8 07:03:54 CEST 2005


On Tue, Jun 07, 2005 at 10:20:04PM +0200, Michael Niedermayer wrote:
> Hi
> 
> On Tuesday 07 June 2005 21:54, Jacob Meuser wrote:
> > On Tue, Jun 07, 2005 at 09:37:20PM +0200, Michael Niedermayer wrote:
> > > Hi
> > >
> > > On Tuesday 07 June 2005 21:17, Jacob Meuser wrote:
> > > > On Sun, May 22, 2005 at 11:04:13AM +0200, Michael Niedermayer wrote:
> > > > > Hi
> > > > >
> > > > > On Thursday 19 May 2005 05:42, Jacob Meuser wrote:
> > > > > > here is the cleaned up patch for gab support for the bktr driver
> > > > > > found on *BSD systems.
> > > > > >
> > > > > > the license is now LGPL, I changed the tabs to 4 spaces, added a
> > > > > > couple comments, and took out an #if 0 block and a CVS Id
> > > > > > that were accidently left in the last version.
> > > > > >
> > > > > >
> > > > > > --- libavformat/grab.c	30 Apr 2005 21:43:58 -0000	1.34
> > > > > > +++ libavformat/grab.c	19 May 2005 03:37:10 -0000
> > > > > > @@ -364,7 +364,7 @@
> > > > > >  }
> > > > > >
> > > > > >  static AVInputFormat video_grab_device_format = {
> > > > > > -    "video4linux",
> > > > > > +    "video_device",
> > > > >
> > > > > is it theoretically impossible for v4l and bktr to coexist on the
> > > > > same machine?
> > >
> > > [...]
> > >
> > > > sorry for the delay.  I have fixed the above issues.  new patch
> > >
> > > hmm, doesnt seem so ...
> >
> > I'm not sure what would be the best as far as ffmpeg is concerned.
> >
> > like this in ffmpeg.c ~ line 259?
> >
> > #ifdef CONFIG_V4L
> > static char *video_grab_format = "video4linux";
> > #else
> > #ifdef CONFIG_BKTR
> > static char *video_grab_format = "bktr";
> > #endif
> > #endif
> 
> ok

I did not do it exactly like this, because that changes the behaviour
with regards to V4L.

> 
> >
> > does a way to specify video_grab_format at runtime already exist?
> > I couldn't find how that would happen.  would that need to be
> > added?  I would think so, or there is no way to use both v4l and
> > bktr in the same ffmpeg binary, and thus the "conflict" isn't really
> > solved.
> 
> that could be added later, i was just against having 2 different video grab 
> systems with the same name and changing an existing name (might break 
> existing code)

this time, there are no changes, only additions.

I think the tricky part of making both available at the same time will
be video_grab_init().  I suppose there could be video_grab_init_v4l()
and likewise for bktr?

-- 
<jakemsr at jakemsr.com>
-------------- next part --------------
Index: configure
===================================================================
RCS file: /cvsroot/ffmpeg/ffmpeg/configure,v
retrieving revision 1.185
diff -u -r1.185 configure
--- configure	29 May 2005 22:11:05 -0000	1.185
+++ configure	8 Jun 2005 04:54:51 -0000
@@ -57,6 +57,7 @@
 echo "  --disable-audio-oss      disable OSS audio support [default=no]"
 echo "  --disable-audio-beos     disable BeOS audio support [default=no]"
 echo "  --disable-v4l            disable video4linux grabbing [default=no]"
+echo "  --disable-bktr           disable bktr video grabbing [default=no]"
 echo "  --disable-dv1394         disable DV1394 grabbing [default=no]"
 echo "  --disable-network        disable network support [default=no]"
 echo "  --disable-zlib           disable zlib [default=no]"
@@ -153,6 +154,7 @@
 esac
 gprof="no"
 v4l="yes"
+bktr="no"
 audio_oss="yes"
 audio_beos="no"
 dv1394="yes"
@@ -258,6 +260,7 @@
 ;;
 NetBSD)
 v4l="no"
+bktr="yes"
 audio_oss="yes"
 dv1394="no"
 make="gmake"
@@ -269,6 +272,7 @@
 ;;
 OpenBSD)
 v4l="no"
+bktr="yes"
 audio_oss="yes"
 dv1394="no"
 make="gmake"
@@ -279,6 +283,7 @@
 ;;
 FreeBSD)
 v4l="no"
+bktr="yes"
 audio_oss="yes"
 dv1394="no"
 make="gmake"
@@ -287,6 +292,7 @@
 ;;
 BSD/OS)
 v4l="no"
+bktr="yes"
 audio_oss="yes"
 dv1394="no"
 extralibs="-lpoll -lgnugetopt -lm"
@@ -431,6 +437,8 @@
   ;;
   --disable-v4l) v4l="no"
   ;;
+  --disable-bktr) bktr="no"
+  ;;
   --disable-audio-oss) audio_oss="no"
   ;;
   --disable-audio-beos) audio_beos="no"
@@ -769,6 +777,7 @@
 
 if test "$mingw32" = "yes" ; then
     v4l="no"
+    bktr="no"
     audio_oss="no"
     dv1394="no"
     dc1394="no"
@@ -1386,6 +1395,11 @@
   echo "CONFIG_VIDEO4LINUX=yes" >> config.mak
 fi
 
+if test "$bktr" = "yes" ; then
+  echo "#define CONFIG_BKTR 1" >> $TMPH
+  echo "CONFIG_BKTR=yes" >> config.mak
+fi
+
 if test "$dv1394" = "yes" ; then
   echo "#define CONFIG_DV1394 1" >> $TMPH
   echo "CONFIG_DV1394=yes" >> config.mak
Index: ffmpeg.c
===================================================================
RCS file: /cvsroot/ffmpeg/ffmpeg/ffmpeg.c,v
retrieving revision 1.333
diff -u -r1.333 ffmpeg.c
--- ffmpeg.c	7 Jun 2005 21:53:56 -0000	1.333
+++ ffmpeg.c	8 Jun 2005 04:55:00 -0000
@@ -256,7 +256,11 @@
 
 static int rate_emu = 0;
 
+#ifdef CONFIG_BKTR
+static char *video_grab_format = "bktr";
+#else
 static char *video_grab_format = "video4linux";
+#endif
 static char *video_device = NULL;
 static char *grab_device = NULL;
 static int  video_channel = 0;
Index: libavformat/Makefile
===================================================================
RCS file: /cvsroot/ffmpeg/ffmpeg/libavformat/Makefile,v
retrieving revision 1.91
diff -u -r1.91 Makefile
--- libavformat/Makefile	22 May 2005 23:58:58 -0000	1.91
+++ libavformat/Makefile	8 Jun 2005 04:55:01 -0000
@@ -40,6 +40,10 @@
 OBJS+= grab.o
 endif
 
+ifeq ($(CONFIG_BKTR),yes)
+OBJS+= grab_bktr.o
+endif
+
 ifeq ($(CONFIG_DV1394),yes)
 OBJS+= dv1394.o
 endif
Index: libavformat/allformats.c
===================================================================
RCS file: /cvsroot/ffmpeg/ffmpeg/libavformat/allformats.c,v
retrieving revision 1.46
diff -u -r1.46 allformats.c
--- libavformat/allformats.c	9 Apr 2005 15:32:58 -0000	1.46
+++ libavformat/allformats.c	8 Jun 2005 04:55:01 -0000
@@ -88,7 +88,7 @@
 #endif
 
     ffm_init();
-#ifdef CONFIG_VIDEO4LINUX
+#if defined(CONFIG_VIDEO4LINUX) || defined(CONFIG_BKTR)
     video_grab_init();
 #endif
 #if defined(CONFIG_AUDIO_OSS) || defined(CONFIG_AUDIO_BEOS)
Index: libavformat/avformat.h
===================================================================
RCS file: /cvsroot/ffmpeg/ffmpeg/libavformat/avformat.h,v
retrieving revision 1.121
diff -u -r1.121 avformat.h
--- libavformat/avformat.h	3 Jun 2005 14:02:29 -0000	1.121
+++ libavformat/avformat.h	8 Jun 2005 04:55:01 -0000
@@ -107,7 +107,7 @@
     enum PixelFormat pix_fmt;
     struct AVImageFormat *image_format;
     int channel; /* used to select dv channel */
-    const char *device; /* video4linux, audio or DV device */
+    const char *device; /* video, audio or DV device */
     const char *standard; /* tv standard, NTSC, PAL, SECAM */
     int mpeg2ts_raw:1;  /* force raw MPEG2 transport stream output, if possible */
     int mpeg2ts_compute_pcr:1; /* compute exact PCR for each transport
Index: libavformat/grab_bktr.c
===================================================================
RCS file: libavformat/grab_bktr.c
diff -N libavformat/grab_bktr.c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ libavformat/grab_bktr.c	8 Jun 2005 04:55:01 -0000
@@ -0,0 +1,331 @@
+/*
+ * *BSD video grab interface
+ * Copyright (c) 2002 Steve O'Hara-Smith
+ * based on
+ *           Linux video grab interface
+ *           Copyright (c) 2000,2001 Gerard Lantau.
+ * and
+ *           simple_grab.c Copyright (c) 1999 Roger Hardiman
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser 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 "avformat.h"
+#if defined(__FreeBSD__)
+# if __FreeBSD__ >= 502100
+#  include <dev/bktr/ioctl_meteor.h>
+#  include <dev/bktr/ioctl_bt848.h>
+# else
+#  include <machine/ioctl_meteor.h>
+#  include <machine/ioctl_bt848.h>
+# endif
+#elseif defined(__DragonFly__)
+# include <dev/video/meteor/ioctl_meteor.h>
+# include <dev/video/bktr/ioctl_bt848.h>
+#else
+# include <dev/ic/bt8xx.h>
+#endif
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/time.h>
+#include <signal.h>
+
+typedef struct {
+    int video_fd;
+    int tuner_fd;
+    int width, height;
+    int frame_rate;
+    int frame_rate_base;
+    u_int64_t per_frame;
+} VideoData;
+
+
+#define PAL 1
+#define PALBDGHI 1
+#define NTSC 2
+#define NTSCM 2
+#define SECAM 3
+#define PALN 4
+#define PALM 5
+#define NTSCJ 6
+
+/* PAL is 768 x 576. NTSC is 640 x 480 */
+#define PAL_HEIGHT 576
+#define SECAM_HEIGHT 576
+#define NTSC_HEIGHT 480
+
+#ifndef VIDEO_FORMAT
+#define VIDEO_FORMAT NTSC
+#endif
+
+static int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
+    METEOR_DEV3, METEOR_DEV_SVIDEO };
+
+uint8_t *video_buf;
+size_t video_buf_size;
+u_int64_t last_frame_time;
+volatile sig_atomic_t nsignals;
+
+
+static void catchsignal(int signal)
+{
+    nsignals++;
+    return;
+}
+
+static int bktr_init(const char *video_device, int width, int height,
+    int format, int *video_fd, int *tuner_fd, int idev, double frequency)
+{
+    struct meteor_geomet geo;
+    int h_max;
+    long ioctl_frequency;
+    char *arg;
+    int c;
+    struct sigaction act, old;
+
+    if (idev < 0 || idev > 4)
+    {
+        arg = getenv ("BKTR_DEV");
+        if (arg)
+            idev = atoi (arg);
+        if (idev < 0 || idev > 4)
+            idev = 1;
+    }
+
+    if (format < 1 || format > 6)
+    {
+        arg = getenv ("BKTR_FORMAT");
+        if (arg)
+            format = atoi (arg);
+        if (format < 1 || format > 6)
+            format = VIDEO_FORMAT;
+    }
+
+    if (frequency <= 0)
+    {
+        arg = getenv ("BKTR_FREQUENCY");
+        if (arg)
+            frequency = atof (arg);
+        if (frequency <= 0)
+            frequency = 0.0;
+    }
+
+    memset(&act, 0, sizeof(act));
+    sigemptyset(&act.sa_mask);
+    act.sa_handler = catchsignal;
+    sigaction(SIGUSR1, &act, &old);
+
+    *tuner_fd = open("/dev/tuner0", O_RDONLY);
+    if (*tuner_fd < 0)
+        perror("Warning: Tuner not opened, continuing");
+
+    *video_fd = open(video_device, O_RDONLY);
+    if (*video_fd < 0) {
+        perror(video_device);
+        return -1;
+    }
+
+    geo.rows = height;
+    geo.columns = width;
+    geo.frames = 1;
+    geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;
+
+    switch (format) {
+    case PAL:   h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
+    case PALN:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALN;     break;
+    case PALM:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALM;     break;
+    case SECAM: h_max = SECAM_HEIGHT; c = BT848_IFORM_F_SECAM;    break;
+    case NTSC:  h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCM;    break;
+    case NTSCJ: h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCJ;    break;
+    default:    h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
+    }
+
+    if (height <= h_max / 2)
+        geo.oformat |= METEOR_GEO_EVEN_ONLY;
+
+    if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
+        perror("METEORSETGEO");
+        return -1;
+    }
+
+    if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
+        perror("BT848SFMT");
+        return -1;
+    }
+
+    c = bktr_dev[idev];
+    if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
+        perror("METEORSINPUT");
+        return -1;
+    }
+
+    video_buf_size = width * height * 12 / 8;
+
+    video_buf = (uint8_t *)mmap((caddr_t)0, video_buf_size, 
+        PROT_READ, MAP_SHARED, *video_fd, (off_t)0);
+    if (video_buf == MAP_FAILED) {
+        perror("mmap");
+        return -1;
+    }
+
+    if (frequency != 0.0) {
+        ioctl_frequency  = (unsigned long)(frequency*16); 
+        if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
+            perror("TVTUNER_SETFREQ");
+    }
+
+    c = AUDIO_UNMUTE;
+    if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
+        perror("TVTUNER_SAUDIO");
+
+    c = METEOR_CAP_CONTINOUS;
+    ioctl(*video_fd, METEORCAPTUR, &c);
+
+    c = SIGUSR1;
+    ioctl(*video_fd, METEORSSIGNAL, &c);
+
+    return 0;
+}
+
+static void bktr_getframe(u_int64_t per_frame)
+{
+    u_int64_t curtime;
+
+    curtime = av_gettime();
+    if (!last_frame_time
+        || ((last_frame_time + per_frame) > curtime)) {
+        if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
+            if (!nsignals)
+                av_log(NULL, AV_LOG_INFO,
+                       "SLEPT NO signals - %d microseconds late\n",
+                       (int)(av_gettime() - last_frame_time - per_frame));
+        }
+    }
+    nsignals = 0;
+    last_frame_time = curtime;
+}
+
+
+/* note: we support only one picture read at a time */
+static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
+{
+    VideoData *s = s1->priv_data;
+
+    if (av_new_packet(pkt, video_buf_size) < 0)
+        return -EIO;
+
+    bktr_getframe(s->per_frame);
+
+    pkt->pts = av_gettime() & ((1LL << 48) - 1);
+    memcpy(pkt->data, video_buf, video_buf_size);
+
+    return video_buf_size;
+}
+
+static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
+{
+    VideoData *s = s1->priv_data;
+    AVStream *st;
+    int width, height;
+    int frame_rate;
+    int frame_rate_base;
+    int format = -1;
+    const char *video_device;
+
+    if (!ap || ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0)
+        return -1;
+
+    width = ap->width;
+    height = ap->height;
+    frame_rate = ap->time_base.den;
+    frame_rate_base = ap->time_base.num;
+
+    video_device = ap->device;
+    if (!video_device)
+        video_device = "/dev/bktr0";
+
+    st = av_new_stream(s1, 0);
+    if (!st)
+        return -ENOMEM;
+    av_set_pts_info(st, 48, 1, 1000000); /* 48 bits pts in use */
+
+    s->width = width;
+    s->height = height;
+    s->frame_rate = frame_rate;
+    s->frame_rate_base = frame_rate_base;
+    s->per_frame = ((u_int64_t)1000000 * s->frame_rate_base) / s->frame_rate;
+
+    st->codec.codec_type = CODEC_TYPE_VIDEO;
+    st->codec.pix_fmt = PIX_FMT_YUV420P;
+    st->codec.codec_id = CODEC_ID_RAWVIDEO;
+    st->codec.width = width;
+    st->codec.height = height;
+    st->codec.time_base.den = frame_rate;
+    st->codec.time_base.num = frame_rate_base;
+
+    if (ap->standard) {
+        if (!strcasecmp(ap->standard, "pal"))
+            format = PAL;
+        else if (!strcasecmp(ap->standard, "secam"))
+            format = SECAM;
+        else if (!strcasecmp(ap->standard, "ntsc"))
+            format = NTSC;
+    }
+
+    if (bktr_init(video_device, width, height, format,
+            &(s->video_fd), &(s->tuner_fd), -1, 0.0) < 0)
+        return -EIO;
+
+    nsignals = 0;
+    last_frame_time = 0;
+
+    return 0;
+}
+
+static int grab_read_close(AVFormatContext *s1)
+{
+    VideoData *s = s1->priv_data;
+    int c;
+
+    c = METEOR_CAP_STOP_CONT;
+    ioctl(s->video_fd, METEORCAPTUR, &c);
+    close(s->video_fd);
+
+    c = AUDIO_MUTE;
+    ioctl(s->tuner_fd, BT848_SAUDIO, &c);
+    close(s->tuner_fd);
+
+    munmap((caddr_t)video_buf, video_buf_size);
+
+    return 0;
+}
+
+AVInputFormat video_grab_device_format = {
+    "bktr",
+    "video grab",
+     sizeof(VideoData),
+     NULL,
+    grab_read_header,
+    grab_read_packet,
+    grab_read_close,
+    .flags = AVFMT_NOFILE,
+};
+
+int video_grab_init(void)
+{
+    av_register_input_format(&video_grab_device_format);
+    return 0;
+}



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