gstreamer/sys/v4l/v4l_calls.c

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/* GStreamer
*
* v4l_calls.c: generic V4L calls
*
* 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 <unistd.h>
#include <gst/gst.h>
#include <gst/interfaces/tuner.h>
#include <gst/interfaces/colorbalance.h>
#include "v4l_calls.h"
#include "gstv4ltuner.h"
#include "gstv4lcolorbalance.h"
#include "gstv4lsrc.h"
/* #include "gstv4lmjpegsrc.h" */
/* #include "gstv4lmjpegsink.h" */
GST_DEBUG_CATEGORY_EXTERN (v4l_debug);
#define GST_CAT_DEFAULT v4l_debug
static const char *picture_name[] = {
"Hue",
"Brightness",
"Contrast",
"Saturation",
NULL
};
G_GNUC_UNUSED static const char *audio_name[] = {
"Volume",
"Mute",
"Mode",
NULL
};
static const char *norm_name[] = {
"PAL",
"NTSC",
"SECAM",
NULL
};
/******************************************************
* gst_v4l_get_capabilities():
* get the device's capturing capabilities
* sets v4lelement->vcap and v4lelement->vwin
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_get_capabilities (GstV4lElement * v4lelement)
{
GST_DEBUG_OBJECT (v4lelement, "getting capabilities");
GST_V4L_CHECK_OPEN (v4lelement);
if (ioctl (v4lelement->video_fd, VIDIOCGCAP, &(v4lelement->vcap)) < 0) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("error getting capabilities %s of from device %s",
g_strerror (errno), v4lelement->videodev));
return FALSE;
}
if (ioctl (v4lelement->video_fd, VIDIOCGWIN, &(v4lelement->vwin)) < 0) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("error getting window properties %s of from device %s",
g_strerror (errno), v4lelement->videodev));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_set_window_properties():
* set the device's capturing parameters (vwin)
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_set_window_properties (GstV4lElement * v4lelement)
{
struct video_window vwin;
GST_DEBUG_OBJECT (v4lelement, "setting window flags 0x%x to device %s",
v4lelement->vwin.flags, v4lelement->videodev);
GST_V4L_CHECK_OPEN (v4lelement);
if (ioctl (v4lelement->video_fd, VIDIOCSWIN, &(v4lelement->vwin)) < 0) {
GST_DEBUG_OBJECT (v4lelement,
"could not ioctl window properties 0x%x to device %s",
v4lelement->vwin.flags, v4lelement->videodev);
return FALSE;
}
/* get it again to make sure we have it correctly */
if (ioctl (v4lelement->video_fd, VIDIOCGWIN, &(vwin)) < 0) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("error getting window properties %s of from device %s",
g_strerror (errno), v4lelement->videodev));
return FALSE;
}
if (vwin.flags != v4lelement->vwin.flags) {
GST_DEBUG_OBJECT (v4lelement, "set 0x%x but got 0x%x back",
v4lelement->vwin.flags, vwin.flags);
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_open():
* open the video device (v4lelement->videodev)
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_open (GstV4lElement * v4lelement)
{
int num;
GST_DEBUG_OBJECT (v4lelement, "opening device %s", v4lelement->videodev);
GST_V4L_CHECK_NOT_OPEN (v4lelement);
GST_V4L_CHECK_NOT_ACTIVE (v4lelement);
/* be sure we have a device */
if (!v4lelement->videodev) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, NOT_FOUND,
(_("No device specified.")), (NULL));
return FALSE;
}
/* open the device */
v4lelement->video_fd = open (v4lelement->videodev, O_RDWR);
if (!GST_V4L_IS_OPEN (v4lelement)) {
if (errno == ENODEV || errno == ENOENT) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, NOT_FOUND,
(_("Device \"%s\" does not exist."), v4lelement->videodev), (NULL));
return FALSE;
}
if (errno == EBUSY) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, BUSY,
(_("Device \"%s\" is already being used."), v4lelement->videodev),
(NULL));
return FALSE;
}
GST_ELEMENT_ERROR (v4lelement, RESOURCE, OPEN_READ_WRITE,
(_("Could not open device \"%s\" for reading and writing."),
v4lelement->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
/* get capabilities */
if (!gst_v4l_get_capabilities (v4lelement)) {
close (v4lelement->video_fd);
v4lelement->video_fd = -1;
return FALSE;
}
/* device type check */
if ((GST_IS_V4LSRC (v4lelement) &&
!(v4lelement->vcap.type & VID_TYPE_CAPTURE))) {
/* (GST_IS_V4LMJPEGSRC (v4lelement) && */
/* !(v4lelement->vcap.type & VID_TYPE_MJPEG_ENCODER)) || */
/* (GST_IS_V4LMJPEGSINK (v4lelement) && */
/* !(v4lelement->vcap.type & VID_TYPE_MJPEG_DECODER))) { */
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("Device opened, but wrong type (0x%x)", v4lelement->vcap.type));
close (v4lelement->video_fd);
v4lelement->video_fd = -1;
return FALSE;
}
GST_INFO_OBJECT (v4lelement, "Opened device \'%s\' (\'%s\') successfully",
v4lelement->vcap.name, v4lelement->videodev);
/* norms + inputs, for the tuner interface */
for (num = 0; norm_name[num] != NULL; num++) {
GstV4lTunerNorm *v4lnorm = g_object_new (GST_TYPE_V4L_TUNER_NORM,
NULL);
GstTunerNorm *norm = GST_TUNER_NORM (v4lnorm);
norm->label = g_strdup (norm_name[num]);
if (num == 1)
gst_value_set_fraction (&norm->framerate, 30000, 1001);
else
gst_value_set_fraction (&norm->framerate, 25, 1);
v4lnorm->index = num;
v4lelement->norms = g_list_append (v4lelement->norms, (gpointer) norm);
}
v4lelement->channels = gst_v4l_get_chan_names (v4lelement);
for (num = 0; picture_name[num] != NULL; num++) {
GstV4lColorBalanceChannel *v4lchannel =
g_object_new (GST_TYPE_V4L_COLOR_BALANCE_CHANNEL, NULL);
GstColorBalanceChannel *channel = GST_COLOR_BALANCE_CHANNEL (v4lchannel);
channel->label = g_strdup (picture_name[num]);
channel->min_value = 0;
channel->max_value = 65535;
v4lchannel->index = num;
v4lelement->colors = g_list_append (v4lelement->colors, channel);
}
GST_DEBUG_OBJECT (v4lelement, "Setting default norm/input");
gst_v4l_set_chan_norm (v4lelement, 0, 0);
return TRUE;
}
/******************************************************
* gst_v4l_close():
* close the video device (v4lelement->video_fd)
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_close (GstV4lElement * v4lelement)
{
GST_DEBUG_OBJECT (v4lelement, "closing device");
GST_V4L_CHECK_OPEN (v4lelement);
GST_V4L_CHECK_NOT_ACTIVE (v4lelement);
close (v4lelement->video_fd);
v4lelement->video_fd = -1;
g_list_foreach (v4lelement->channels, (GFunc) g_object_unref, NULL);
g_list_free (v4lelement->channels);
v4lelement->channels = NULL;
g_list_foreach (v4lelement->norms, (GFunc) g_object_unref, NULL);
g_list_free (v4lelement->norms);
v4lelement->norms = NULL;
g_list_foreach (v4lelement->colors, (GFunc) g_object_unref, NULL);
g_list_free (v4lelement->colors);
v4lelement->colors = NULL;
return TRUE;
}
/******************************************************
* gst_v4l_get_num_chans()
* return value: the number of video input channels
******************************************************/
Correct all relevant warnings found by the sparse semantic code analyzer. This include marking several symbols static... Original commit message from CVS: * ext/alsa/gstalsamixertrack.c: (gst_alsa_mixer_track_get_type): * ext/alsa/gstalsasink.c: (set_hwparams): * ext/alsa/gstalsasrc.c: (set_hwparams): * ext/gio/gstgio.c: (gst_gio_uri_handler_get_uri): * ext/ogg/gstoggmux.h: * ext/ogg/gstogmparse.c: * gst-libs/gst/audio/audio.c: * gst-libs/gst/fft/kiss_fft_f64.c: (kiss_fft_f64_alloc): * gst-libs/gst/pbutils/missing-plugins.c: (gst_missing_uri_sink_message_new), (gst_missing_element_message_new), (gst_missing_decoder_message_new), (gst_missing_encoder_message_new): * gst-libs/gst/rtp/gstbasertppayload.c: * gst-libs/gst/rtp/gstrtcpbuffer.c: (gst_rtcp_packet_bye_get_reason): * gst/audioconvert/gstaudioconvert.c: * gst/audioresample/gstaudioresample.c: * gst/ffmpegcolorspace/imgconvert.c: * gst/playback/test.c: (gen_video_element), (gen_audio_element): * gst/typefind/gsttypefindfunctions.c: * gst/videoscale/vs_4tap.c: * gst/videoscale/vs_4tap.h: * sys/v4l/gstv4lelement.c: * sys/v4l/gstv4lsrc.c: (gst_v4lsrc_get_any_caps): * sys/v4l/v4l_calls.c: * sys/v4l/v4lsrc_calls.c: (gst_v4lsrc_capture_init), (gst_v4lsrc_try_capture): * sys/ximage/ximagesink.c: (gst_ximagesink_check_xshm_calls), (gst_ximagesink_ximage_new): * sys/xvimage/xvimagesink.c: (gst_xvimagesink_check_xshm_calls), (gst_xvimagesink_xvimage_new): * tests/check/elements/audioconvert.c: * tests/check/elements/audioresample.c: (fail_unless_perfect_stream): * tests/check/elements/audiotestsrc.c: (setup_audiotestsrc): * tests/check/elements/decodebin.c: * tests/check/elements/gdpdepay.c: (setup_gdpdepay), (setup_gdpdepay_streamheader): * tests/check/elements/gdppay.c: (setup_gdppay), (GST_START_TEST), (setup_gdppay_streamheader): * tests/check/elements/gnomevfssink.c: (setup_gnomevfssink): * tests/check/elements/multifdsink.c: (setup_multifdsink): * tests/check/elements/textoverlay.c: * tests/check/elements/videorate.c: (setup_videorate): * tests/check/elements/videotestsrc.c: (setup_videotestsrc): * tests/check/elements/volume.c: (setup_volume): * tests/check/elements/vorbisdec.c: (setup_vorbisdec): * tests/check/elements/vorbistag.c: * tests/check/generic/clock-selection.c: * tests/check/generic/states.c: (setup), (teardown): * tests/check/libs/cddabasesrc.c: * tests/check/libs/video.c: * tests/check/pipelines/gio.c: * tests/check/pipelines/oggmux.c: * tests/check/pipelines/simple-launch-lines.c: (simple_launch_lines_suite): * tests/check/pipelines/streamheader.c: * tests/check/pipelines/theoraenc.c: * tests/check/pipelines/vorbisdec.c: * tests/check/pipelines/vorbisenc.c: * tests/examples/seek/scrubby.c: * tests/examples/seek/seek.c: (query_positions_elems), (query_positions_pads): * tests/icles/stress-xoverlay.c: (myclock): Correct all relevant warnings found by the sparse semantic code analyzer. This include marking several symbols static, using NULL instead of 0 for pointers and using "foo (void)" instead of "foo ()" for declarations. * win32/common/libgstrtp.def: Add gst_rtp_buffer_set_extension_data to the symbol definition file.
2008-03-03 06:04:31 +00:00
static gint
gst_v4l_get_num_chans (GstV4lElement * v4lelement)
{
GST_DEBUG_OBJECT (v4lelement, "getting number of channels");
GST_V4L_CHECK_OPEN (v4lelement);
return v4lelement->vcap.channels;
}
/******************************************************
* gst_v4l_get_chan_names()
* return value: a GList containing the channel names
******************************************************/
GList *
gst_v4l_get_chan_names (GstV4lElement * v4lelement)
{
struct video_channel vchan = { 0 };
GList *list = NULL;
gint i;
GST_DEBUG_OBJECT (v4lelement, "getting channel names");
if (!GST_V4L_IS_OPEN (v4lelement))
return NULL;
for (i = 0; i < gst_v4l_get_num_chans (v4lelement); i++) {
GstV4lTunerChannel *v4lchannel;
GstTunerChannel *channel;
vchan.channel = i;
if (ioctl (v4lelement->video_fd, VIDIOCGCHAN, &vchan) < 0) {
/* Skip this channel */
continue;
}
v4lchannel = g_object_new (GST_TYPE_V4L_TUNER_CHANNEL, NULL);
v4lchannel->index = i;
channel = GST_TUNER_CHANNEL (v4lchannel);
channel->label = g_strdup (vchan.name);
channel->flags = GST_TUNER_CHANNEL_INPUT;
if (vchan.flags & VIDEO_VC_TUNER) {
struct video_tuner vtun;
gint n;
for (n = 0;; n++) {
if (n >= vchan.tuners) {
vtun.tuner = 0; /* default */
} else {
vtun.tuner = n;
if (ioctl (v4lelement->video_fd, VIDIOCGTUNER, &vtun) < 0)
continue; /* no more tuners */
if (strcmp (vtun.name, vchan.name) != 0) {
continue; /* not this one */
}
}
/* FIXME: in the case of n >= vchan.tuners the code below accesses
* uninitialised fields in vtun
* Not sure if the codeblock below should go into the else above, but
* then setting vtun.tuner=0 is a bit pointless.
*/
v4lchannel->tuner = n;
channel->flags |= GST_TUNER_CHANNEL_FREQUENCY;
channel->freq_multiplicator =
62.5 * ((vtun.flags & VIDEO_TUNER_LOW) ? 1 : 1000);
channel->min_frequency = vtun.rangelow * channel->freq_multiplicator;
channel->max_frequency = vtun.rangehigh * channel->freq_multiplicator;
channel->min_signal = 0;
channel->max_signal = 0xffff;
break;
}
}
if (vchan.flags & VIDEO_VC_AUDIO) {
struct video_audio vaud;
gint n;
for (n = 0; n < v4lelement->vcap.audios; n++) {
vaud.audio = n;
if (ioctl (v4lelement->video_fd, VIDIOCGAUDIO, &vaud) < 0)
continue;
if (!strcmp (vaud.name, vchan.name)) {
v4lchannel->audio = n;
channel->flags |= GST_TUNER_CHANNEL_AUDIO;
break;
}
}
}
list = g_list_prepend (list, (gpointer) channel);
}
return g_list_reverse (list);
}
/******************************************************
* gst_v4l_get_chan_norm():
* get the currently active video-channel and it's
* norm (VIDEO_MODE_{PAL|NTSC|SECAM|AUTO})
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_get_chan_norm (GstV4lElement * v4lelement, gint * channel, gint * norm)
{
GST_DEBUG_OBJECT (v4lelement, "getting current channel and norm");
GST_V4L_CHECK_OPEN (v4lelement);
if (channel)
*channel = v4lelement->vchan.channel;
if (norm)
*norm = v4lelement->vchan.norm;
return TRUE;
}
/******************************************************
* gst_v4l_set_chan_norm():
* set a new active channel and it's norm
* (VIDEO_MODE_{PAL|NTSC|SECAM|AUTO})
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_set_chan_norm (GstV4lElement * v4lelement, gint channel, gint norm)
{
GST_DEBUG_OBJECT (v4lelement, "setting channel = %d, norm = %d (%s)",
channel, norm, norm_name[norm]);
GST_V4L_CHECK_OPEN (v4lelement);
//GST_V4L_CHECK_NOT_ACTIVE (v4lelement);
v4lelement->vchan.channel = channel;
v4lelement->vchan.norm = norm;
if (ioctl (v4lelement->video_fd, VIDIOCSCHAN, &(v4lelement->vchan)) < 0) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("Error setting the channel/norm settings: %s", g_strerror (errno)));
return FALSE;
}
if (ioctl (v4lelement->video_fd, VIDIOCGCHAN, &(v4lelement->vchan)) < 0) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("Error getting the channel/norm settings: %s", g_strerror (errno)));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_get_signal():
* get the current signal
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_get_signal (GstV4lElement * v4lelement, gint tunernum, guint * signal)
{
struct video_tuner tuner;
GST_DEBUG_OBJECT (v4lelement, "getting tuner signal");
GST_V4L_CHECK_OPEN (v4lelement);
tuner.tuner = tunernum;
if (ioctl (v4lelement->video_fd, VIDIOCGTUNER, &tuner) < 0) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("Error getting tuner signal: %s", g_strerror (errno)));
return FALSE;
}
*signal = tuner.signal;
return TRUE;
}
/******************************************************
* gst_v4l_get_frequency():
* get the current frequency
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_get_frequency (GstV4lElement * v4lelement,
gint tunernum, gulong * frequency)
{
struct video_tuner vtun;
GstTunerChannel *channel;
GST_DEBUG_OBJECT (v4lelement, "getting tuner frequency");
GST_V4L_CHECK_OPEN (v4lelement);
channel = gst_tuner_get_channel (GST_TUNER (v4lelement));
/* check that this is the current input */
vtun.tuner = tunernum;
if (ioctl (v4lelement->video_fd, VIDIOCGTUNER, &vtun) < 0)
return FALSE;
if (strcmp (vtun.name, v4lelement->vchan.name))
return FALSE;
if (ioctl (v4lelement->video_fd, VIDIOCGFREQ, frequency) < 0) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("Error getting tuner frequency: %s", g_strerror (errno)));
return FALSE;
}
*frequency = *frequency * channel->freq_multiplicator;
return TRUE;
}
/******************************************************
* gst_v4l_set_frequency():
* set frequency
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_set_frequency (GstV4lElement * v4lelement,
gint tunernum, gulong frequency)
{
struct video_tuner vtun;
GstTunerChannel *channel;
GST_DEBUG_OBJECT (v4lelement, "setting tuner frequency to %lu", frequency);
GST_V4L_CHECK_OPEN (v4lelement);
channel = gst_tuner_get_channel (GST_TUNER (v4lelement));
/* check that this is the current input */
vtun.tuner = tunernum;
if (ioctl (v4lelement->video_fd, VIDIOCGTUNER, &vtun) < 0)
return FALSE;
if (strcmp (vtun.name, v4lelement->vchan.name))
return FALSE;
frequency = frequency / channel->freq_multiplicator;
if (ioctl (v4lelement->video_fd, VIDIOCSFREQ, &frequency) < 0) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("Error setting tuner frequency: %s", g_strerror (errno)));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_get_picture():
* get a picture value
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_get_picture (GstV4lElement * v4lelement,
GstV4lPictureType type, gint * value)
{
struct video_picture vpic;
GST_DEBUG_OBJECT (v4lelement, "getting picture property type %d (%s)", type,
picture_name[type]);
GST_V4L_CHECK_OPEN (v4lelement);
if (ioctl (v4lelement->video_fd, VIDIOCGPICT, &vpic) < 0) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("Error getting picture parameters: %s", g_strerror (errno)));
return FALSE;
}
switch (type) {
case V4L_PICTURE_HUE:
*value = vpic.hue;
break;
case V4L_PICTURE_BRIGHTNESS:
*value = vpic.brightness;
break;
case V4L_PICTURE_CONTRAST:
*value = vpic.contrast;
break;
case V4L_PICTURE_SATURATION:
*value = vpic.colour;
break;
default:
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("Error getting picture parameters: unknown type %d", type));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_set_picture():
* set a picture value
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_set_picture (GstV4lElement * v4lelement,
GstV4lPictureType type, gint value)
{
struct video_picture vpic;
GST_DEBUG_OBJECT (v4lelement, "setting picture type %d (%s) to value %d",
type, picture_name[type], value);
GST_V4L_CHECK_OPEN (v4lelement);
if (ioctl (v4lelement->video_fd, VIDIOCGPICT, &vpic) < 0) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("Error getting picture parameters: %s", g_strerror (errno)));
return FALSE;
}
switch (type) {
case V4L_PICTURE_HUE:
vpic.hue = value;
break;
case V4L_PICTURE_BRIGHTNESS:
vpic.brightness = value;
break;
case V4L_PICTURE_CONTRAST:
vpic.contrast = value;
break;
case V4L_PICTURE_SATURATION:
vpic.colour = value;
break;
default:
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("Error setting picture parameters: unknown type %d", type));
return FALSE;
}
if (ioctl (v4lelement->video_fd, VIDIOCSPICT, &vpic) < 0) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("Error setting picture parameters: %s", g_strerror (errno)));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_get_audio():
* get some audio value
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_get_audio (GstV4lElement * v4lelement,
gint audionum, GstV4lAudioType type, gint * value)
{
struct video_audio vau;
GST_DEBUG_OBJECT (v4lelement, "getting audio parameter type %d (%s)", type,
audio_name[type]);
GST_V4L_CHECK_OPEN (v4lelement);
vau.audio = audionum;
if (ioctl (v4lelement->video_fd, VIDIOCGAUDIO, &vau) < 0) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("Error getting audio parameters: %s", g_strerror (errno)));
return FALSE;
}
switch (type) {
case V4L_AUDIO_MUTE:
*value = (vau.flags & VIDEO_AUDIO_MUTE);
break;
case V4L_AUDIO_VOLUME:
*value = vau.volume;
break;
case V4L_AUDIO_MODE:
*value = vau.mode;
break;
default:
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("Error getting audio parameters: unknown type %d", type));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_set_audio():
* set some audio value
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_set_audio (GstV4lElement * v4lelement,
gint audionum, GstV4lAudioType type, gint value)
{
struct video_audio vau;
GST_DEBUG_OBJECT (v4lelement,
"setting audio parameter type %d (%s) to value %d", type,
audio_name[type], value);
GST_V4L_CHECK_OPEN (v4lelement);
vau.audio = audionum;
if (ioctl (v4lelement->video_fd, VIDIOCGAUDIO, &vau) < 0) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("Error getting audio parameters: %s", g_strerror (errno)));
return FALSE;
}
switch (type) {
case V4L_AUDIO_MUTE:
if (!(vau.flags & VIDEO_AUDIO_MUTABLE)) {
GST_ELEMENT_ERROR (v4lelement, CORE, NOT_IMPLEMENTED, (NULL),
("Error setting audio mute: (un)setting mute is not supported"));
return FALSE;
}
if (value)
vau.flags |= VIDEO_AUDIO_MUTE;
else
vau.flags &= ~VIDEO_AUDIO_MUTE;
break;
case V4L_AUDIO_VOLUME:
if (!(vau.flags & VIDEO_AUDIO_VOLUME)) {
GST_ELEMENT_ERROR (v4lelement, CORE, NOT_IMPLEMENTED, (NULL),
("Error setting audio volume: setting volume is not supported"));
return FALSE;
}
vau.volume = value;
break;
case V4L_AUDIO_MODE:
vau.mode = value;
break;
default:
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("Error setting audio parameters: unknown type %d", type));
return FALSE;
}
if (ioctl (v4lelement->video_fd, VIDIOCSAUDIO, &vau) < 0) {
GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
("Error setting audio parameters: %s", g_strerror (errno)));
return FALSE;
}
return TRUE;
}