Based on the xawtv3 code to do the same. This is useful for a more
plug and play operation esp. when a usb webcam sometimes gets plugged
in which may change the video-dev enumeration order.
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
src/tvtimeconf.c | 14 ++++--
src/videoinput.c | 141 +++++++++++++++++++++++++++++++++++++++++--------------
2 files changed, 116 insertions(+), 39 deletions(-)
diff --git a/src/tvtimeconf.c b/src/tvtimeconf.c
index 3667dd7..ee80d02 100644
--- a/src/tvtimeconf.c
+++ b/src/tvtimeconf.c
@@ -51,6 +51,12 @@
#define MAX_KEYSYMS 350
#define MAX_BUTTONS 15
+#ifdef __linux__ /* This depends on sysfs, so it is linux only */
+#define DEFAULT_VIDEO_DEV "auto"
+#else
+#define DEFAULT_VIDEO_DEV "/dev/video0"
+#endif
+
struct config_s
{
char *geometry;
@@ -616,7 +622,7 @@ static void print_usage( char **argv )
lfputs( _(" -A, --nowidescreen 4:3 mode.\n"), stderr );
lfputs( _(" -b, --vbidevice=DEVICE VBI device (defaults to /dev/vbi0).\n"), stderr );
lfputs( _(" -c, --channel=CHANNEL Tune to the specified channel on startup.\n"), stderr );
- lfputs( _(" -d, --device=DEVICE video4linux device (defaults to /dev/video0).\n"), stderr );
+ lfputs( _(" -d, --device=DEVICE video4linux device (defaults to " DEFAULT_VIDEO_DEV ").\n"), stderr );
lfputs( _(" -f, --frequencies=NAME The frequency table to use for the tuner.\n"
" (defaults to us-cable).\n\n"
" Valid values are:\n"
@@ -671,7 +677,7 @@ static void print_config_usage( char **argv )
lfputs( _(" -A, --nowidescreen 4:3 mode.\n"), stderr );
lfputs( _(" -b, --vbidevice=DEVICE VBI device (defaults to /dev/vbi0).\n"), stderr );
lfputs( _(" -c, --channel=CHANNEL Tune to the specified channel on startup.\n"), stderr );
- lfputs( _(" -d, --device=DEVICE video4linux device (defaults to /dev/video0).\n"), stderr );
+ lfputs( _(" -d, --device=DEVICE video4linux device (defaults to " DEFAULT_VIDEO_DEV ").\n"), stderr );
lfputs( _(" -f, --frequencies=NAME The frequency table to use for the tuner.\n"
" (defaults to us-cable).\n\n"
" Valid values are:\n"
@@ -727,7 +733,7 @@ static void print_config_usage( char **argv )
static void print_scanner_usage( char **argv )
{
lfprintf( stderr, _("usage: %s [OPTION]...\n\n"), argv[ 0 ]);
- lfputs( _(" -d, --device=DEVICE video4linux device (defaults to /dev/video0).\n"), stderr );
+ lfputs( _(" -d, --device=DEVICE video4linux device (defaults to " DEFAULT_VIDEO_DEV ").\n"), stderr );
lfputs( _(" -F, --configfile=FILE Additional config file to load settings from.\n"), stderr );
lfputs( _(" -h, --help Show this help message.\n"), stderr );
lfputs( _(" -i, --input=INPUTNUM video4linux input number (defaults to 0).\n"), stderr );
@@ -785,7 +791,7 @@ config_t *config_new( void )
ct->inputwidth = 720;
ct->inputnum = 0;
- ct->v4ldev = strdup( "/dev/video0" );
+ ct->v4ldev = strdup( DEFAULT_VIDEO_DEV );
ct->norm = strdup( "ntsc" );
ct->freq = strdup( "us-cable" );
temp_dirname = getenv( "HOME" );
diff --git a/src/videoinput.c b/src/videoinput.c
index f66a35e..698d4b5 100644
--- a/src/videoinput.c
+++ b/src/videoinput.c
@@ -19,6 +19,7 @@
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
+#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
@@ -38,6 +39,7 @@
#include <linux/videodev2.h>
#include "videoinput.h"
#include "mixer.h"
+#include "get_media_devices.h"
/**
* How long to wait when we lose a signal, or acquire a signal.
@@ -319,11 +321,59 @@ int videoinput_buffer_invalid( videoinput_t *vidin, int frameid )
return vidin->capbuffers[ frameid ].free;
}
+int videoinput_open_v4l_device( videoinput_t *vidin, const char *path,
+ int caps, const char *type)
+{
+ struct v4l2_capability caps_v4l2;
+ int fd;
+
+ /* First, open the device. */
+ fd = open( path, O_RDWR );
+ if( fd == -1 ) {
+ fprintf( stderr, "videoinput: Cannot open device %s: %s\n",
+ path, strerror( errno ) );
+ }
+
+ /**
+ * Next, ask for its capabilities. This will also confirm it's a V4L2
+ * device.
+ */
+ if( ioctl( fd, VIDIOC_QUERYCAP, &caps_v4l2 ) < 0 ) {
+ /* Can't get V4L2 capabilities, maybe this is a V4L1 device? */
+ fprintf( stderr, "videoinput: %s: V4L1 devices not supported\n", path );
+ close( fd );
+ return -1;
+ }
+
+ if( (caps_v4l2.capabilities & caps) != caps ) {
+ if( vidin->verbose ) {
+ fprintf( stderr, "videoinput: %s: does not have %s caps\n",
+ path, type );
+ }
+ close( fd );
+ return -1;
+ }
+
+ if( vidin->verbose ) {
+ fprintf( stderr, "videoinput: Using video4linux2 driver '%s', card '%s' (bus %s).\n"
+ "videoinput: Version is %u, capabilities %x.\n",
+ caps_v4l2.driver, caps_v4l2.card, caps_v4l2.bus_info,
+ caps_v4l2.version, caps_v4l2.capabilities );
+ }
+ vidin->isv4l2 = 1;
+ snprintf( vidin->drivername, sizeof( vidin->drivername ), "%s [%s/%s/%u]",
+ caps_v4l2.driver, caps_v4l2.card,
+ caps_v4l2.bus_info, caps_v4l2.version );
+ snprintf( vidin->shortdriver, sizeof( vidin->shortdriver ), "%s",
+ caps_v4l2.driver );
+
+ return fd;
+}
+
videoinput_t *videoinput_new( config_t *cfg, int norm, int verbose,
char *error_string )
{
videoinput_t *vidin = malloc( sizeof( videoinput_t ) );
- struct v4l2_capability caps_v4l2;
struct v4l2_input in;
int i;
@@ -379,43 +429,64 @@ videoinput_t *videoinput_new( config_t *cfg, int norm, int verbose,
memset( vidin->drivername, 0, sizeof( vidin->drivername ) );
memset( vidin->shortdriver, 0, sizeof( vidin->shortdriver ) );
- /* First, open the device. */
- vidin->grab_fd = open( v4l_device, O_RDWR );
- if( vidin->grab_fd < 0 ) {
- fprintf( stderr, "videoinput: Cannot open capture device %s: %s\n",
- v4l_device, strerror( errno ) );
- sprintf( error_string, "%s", strerror( errno ) );
- free( vidin );
- return 0;
- }
+ vidin->grab_fd = -1;
- /**
- * Next, ask for its capabilities. This will also confirm it's a V4L2
- * device.
- */
- if( ioctl( vidin->grab_fd, VIDIOC_QUERYCAP, &caps_v4l2 ) < 0 ) {
- /* Can't get V4L2 capabilities, maybe this is a V4L1 device? */
- fprintf(stderr, "V4L1 devices not supported\n");
- sprintf( error_string, "V4L1 devices not supported" );
- close( vidin->grab_fd );
- free( vidin );
- return 0;
- } else {
- if( vidin->verbose ) {
- fprintf( stderr, "videoinput: Using video4linux2 driver '%s', card '%s' (bus %s).\n"
- "videoinput: Version is %u, capabilities %x.\n",
- caps_v4l2.driver, caps_v4l2.card, caps_v4l2.bus_info,
- caps_v4l2.version, caps_v4l2.capabilities );
+#ifdef __linux__ /* Because this depends on get_media_devices.c */
+ if( !strcmp( v4l_device, "auto") ) {
+ char path[PATH_MAX];
+ const char *type;
+ int caps;
+ void *md;
+
+ md = discover_media_devices();
+ if( !md ) {
+ sprintf( error_string, "Cannot enumerate video devices" );
+ free( vidin );
+ return 0;
}
- vidin->isv4l2 = 1;
- snprintf( vidin->drivername, sizeof( vidin->drivername ),
- "%s [%s/%s/%u]",
- caps_v4l2.driver, caps_v4l2.card,
- caps_v4l2.bus_info, caps_v4l2.version );
- snprintf( vidin->shortdriver, sizeof( vidin->shortdriver ),
- "%s", caps_v4l2.driver );
- }
+ /* Step 1: try TV cards first */
+ type = "analog TV";
+ caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TUNER;
+retry:
+ v4l_device = NULL;
+ while( 1 ) {
+ v4l_device = get_associated_device( md, v4l_device, MEDIA_V4L_VIDEO,
+ NULL, NONE );
+ if( !v4l_device )
+ break; /* No more video devices to try */
+ snprintf( path, PATH_MAX, "/dev/%s", v4l_device );
+ if( verbose )
+ fprintf(stderr, "videoinput-auto: trying: %s... \n", path);
+ vidin->grab_fd = videoinput_open_v4l_device( vidin, path, caps,
+ type );
+ if( vidin->grab_fd != -1 ) {
+ fprintf( stderr, "videoinput-auto: using %s device %s\n",
+ type, path);
+ break;
+ }
+ }
+
+ /* Step 2: try grabber devices and webcams */
+ if( vidin->grab_fd == -1 &&
+ caps == (V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TUNER) ) {
+ type = "capture";
+ caps = V4L2_CAP_VIDEO_CAPTURE;
+ goto retry;
+ }
+
+ free_media_devices(md);
+ } else
+#endif
+ vidin->grab_fd = videoinput_open_v4l_device( vidin, v4l_device,
+ V4L2_CAP_VIDEO_CAPTURE,
+ "capture" );
+
+ if( vidin->grab_fd == -1 ) {
+ sprintf( error_string, "Cannot open/use video device %s", v4l_device );
+ free( vidin );
+ return 0;
+ }
vidin->numinputs = 0;
in.index = vidin->numinputs;
--
2.5.0
--
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