Commit 1a0adaf3 authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
Browse files

V4L/DVB (5345): ivtv driver for Conexant cx23416/cx23415 MPEG encoder/decoder



It took three core maintainers, over four years of work, eight new i2c
modules, eleven new V4L2 ioctls, three new DVB video ioctls, a Sliced
VBI API, a new MPEG encoder API, an enhanced DVB video MPEG decoding
API, major YUV/OSD contributions from Ian and John, web/wiki/svn/trac
support from Axel Thimm, (hardware) support from Hauppauge, support and
assistance from the v4l-dvb people and the many, many users of ivtv to
finally make it possible to merge this driver into the kernel.
Thank you all!
Signed-off-by: default avatarKevin Thayer <nufan_wfk@yahoo.com>
Signed-off-by: default avatarChris Kennedy <c@groovy.org>
Signed-off-by: default avatarHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: default avatarJohn P Harvey <john.p.harvey@btinternet.com>
Signed-off-by: default avatarIan Armstrong <ian@iarmst.demon.co.uk>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent ac52ea3c
......@@ -647,6 +647,8 @@ config VIDEO_HEXIUM_GEMINI
source "drivers/media/video/cx88/Kconfig"
source "drivers/media/video/ivtv/Kconfig"
config VIDEO_M32R_AR
tristate "AR devices"
depends on M32R && VIDEO_V4L1
......
......@@ -61,6 +61,7 @@ obj-$(CONFIG_VIDEO_CPIA_USB) += cpia_usb.o
obj-$(CONFIG_VIDEO_MEYE) += meye.o
obj-$(CONFIG_VIDEO_SAA7134) += ir-kbd-i2c.o saa7134/
obj-$(CONFIG_VIDEO_CX88) += cx88/
obj-$(CONFIG_VIDEO_IVTV) += ivtv/
obj-$(CONFIG_VIDEO_EM28XX) += em28xx/
obj-$(CONFIG_VIDEO_USBVISION) += usbvision/
obj-$(CONFIG_VIDEO_TVP5150) += tvp5150.o
......
config VIDEO_IVTV
tristate "Conexant cx23416/cx23415 MPEG encoder/decoder support"
depends on VIDEO_V4L2 && USB && I2C && EXPERIMENTAL
select FW_LOADER
select VIDEO_TUNER
select VIDEO_TVEEPROM
select VIDEO_CX2341X
select VIDEO_MSP3400
select VIDEO_SAA711X
select VIDEO_SAA7127
select VIDEO_TVAUDIO
select VIDEO_CS53L32A
select VIDEO_TLV320AIC23B
select VIDEO_WM8775
select VIDEO_WM8739
select VIDEO_UPD64031A
select VIDEO_UPD64083
---help---
This is a video4linux driver for Conexant cx23416 or cx23416 based
PCI personal video recorder devices.
This is used in devices such as the Hauppauge PVR-150/250/350/500
cards.
To compile this driver as a module, choose M here: the
module will be called ivtv.
ivtv-objs := ivtv-audio.o ivtv-cards.o ivtv-controls.o \
ivtv-driver.o ivtv-fileops.o ivtv-firmware.o \
ivtv-gpio.o ivtv-i2c.o ivtv-ioctl.o ivtv-irq.o \
ivtv-mailbox.o ivtv-queue.o ivtv-streams.o ivtv-udma.o \
ivtv-vbi.o ivtv-video.o ivtv-yuv.o
obj-$(CONFIG_VIDEO_IVTV) += ivtv.o
/*
Audio-related ivtv functions.
Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "ivtv-driver.h"
#include "ivtv-mailbox.h"
#include "ivtv-i2c.h"
#include "ivtv-gpio.h"
#include "ivtv-cards.h"
#include "ivtv-audio.h"
#include <media/msp3400.h>
#include <linux/videodev.h>
/* Selects the audio input and output according to the current
settings. */
int ivtv_audio_set_io(struct ivtv *itv)
{
struct v4l2_routing route;
u32 audio_input;
int mux_input;
/* Determine which input to use */
if (test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
audio_input = itv->card->radio_input.audio_input;
mux_input = itv->card->radio_input.muxer_input;
} else {
audio_input = itv->card->audio_inputs[itv->audio_input].audio_input;
mux_input = itv->card->audio_inputs[itv->audio_input].muxer_input;
}
/* handle muxer chips */
route.input = mux_input;
route.output = 0;
ivtv_i2c_hw(itv, itv->card->hw_muxer, VIDIOC_INT_S_AUDIO_ROUTING, &route);
route.input = audio_input;
if (itv->card->hw_audio & IVTV_HW_MSP34XX) {
route.output = MSP_OUTPUT(MSP_SC_IN_DSP_SCART1);
}
return ivtv_i2c_hw(itv, itv->card->hw_audio, VIDIOC_INT_S_AUDIO_ROUTING, &route);
}
void ivtv_audio_set_route(struct ivtv *itv, struct v4l2_routing *route)
{
ivtv_i2c_hw(itv, itv->card->hw_audio, VIDIOC_INT_S_AUDIO_ROUTING, route);
}
void ivtv_audio_set_audio_clock_freq(struct ivtv *itv, u8 freq)
{
static u32 freqs[3] = { 44100, 48000, 32000 };
/* The audio clock of the digitizer must match the codec sample
rate otherwise you get some very strange effects. */
if (freq > 2)
return;
ivtv_call_i2c_clients(itv, VIDIOC_INT_AUDIO_CLOCK_FREQ, &freqs[freq]);
}
/*
Audio-related ivtv functions.
Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
int ivtv_audio_set_io(struct ivtv *itv);
void ivtv_audio_set_route(struct ivtv *itv, struct v4l2_routing *route);
void ivtv_audio_set_audio_clock_freq(struct ivtv *itv, u8 freq);
This diff is collapsed.
/*
Functions to query card hardware
Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* hardware flags */
#define IVTV_HW_CX25840 (1 << 0)
#define IVTV_HW_SAA7115 (1 << 1)
#define IVTV_HW_SAA7127 (1 << 2)
#define IVTV_HW_MSP34XX (1 << 3)
#define IVTV_HW_TUNER (1 << 4)
#define IVTV_HW_WM8775 (1 << 5)
#define IVTV_HW_CS53L32A (1 << 6)
#define IVTV_HW_TVEEPROM (1 << 7)
#define IVTV_HW_SAA7114 (1 << 8)
#define IVTV_HW_TVAUDIO (1 << 9)
#define IVTV_HW_UPD64031A (1 << 10)
#define IVTV_HW_UPD6408X (1 << 11)
#define IVTV_HW_SAA717X (1 << 12)
#define IVTV_HW_WM8739 (1 << 13)
#define IVTV_HW_GPIO (1 << 14)
#define IVTV_HW_SAA711X (IVTV_HW_SAA7115 | IVTV_HW_SAA7114)
/* video inputs */
#define IVTV_CARD_INPUT_VID_TUNER 1
#define IVTV_CARD_INPUT_SVIDEO1 2
#define IVTV_CARD_INPUT_SVIDEO2 3
#define IVTV_CARD_INPUT_COMPOSITE1 4
#define IVTV_CARD_INPUT_COMPOSITE2 5
#define IVTV_CARD_INPUT_COMPOSITE3 6
/* audio inputs */
#define IVTV_CARD_INPUT_AUD_TUNER 1
#define IVTV_CARD_INPUT_LINE_IN1 2
#define IVTV_CARD_INPUT_LINE_IN2 3
#define IVTV_CARD_MAX_VIDEO_INPUTS 6
#define IVTV_CARD_MAX_AUDIO_INPUTS 3
#define IVTV_CARD_MAX_TUNERS 2
/* SAA71XX HW inputs */
#define IVTV_SAA71XX_COMPOSITE0 0
#define IVTV_SAA71XX_COMPOSITE1 1
#define IVTV_SAA71XX_COMPOSITE2 2
#define IVTV_SAA71XX_COMPOSITE3 3
#define IVTV_SAA71XX_COMPOSITE4 4
#define IVTV_SAA71XX_COMPOSITE5 5
#define IVTV_SAA71XX_SVIDEO0 6
#define IVTV_SAA71XX_SVIDEO1 7
#define IVTV_SAA71XX_SVIDEO2 8
#define IVTV_SAA71XX_SVIDEO3 9
/* SAA717X needs to mark the tuner input by ORing with this flag */
#define IVTV_SAA717X_TUNER_FLAG 0x80
/* Dummy HW input */
#define IVTV_DUMMY_AUDIO 0
/* GPIO HW inputs */
#define IVTV_GPIO_TUNER 0
#define IVTV_GPIO_LINE_IN 1
/* SAA717X HW inputs */
#define IVTV_SAA717X_IN0 0
#define IVTV_SAA717X_IN1 1
#define IVTV_SAA717X_IN2 2
/* V4L2 capability aliases */
#define IVTV_CAP_ENCODER (V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TUNER | \
V4L2_CAP_AUDIO | V4L2_CAP_READWRITE | V4L2_CAP_VBI_CAPTURE | \
V4L2_CAP_SLICED_VBI_CAPTURE)
#define IVTV_CAP_DECODER (V4L2_CAP_VBI_OUTPUT | V4L2_CAP_VIDEO_OUTPUT | \
V4L2_CAP_SLICED_VBI_OUTPUT | V4L2_CAP_VIDEO_OUTPUT_OVERLAY | V4L2_CAP_VIDEO_OUTPUT_POS)
struct ivtv_card_video_input {
u8 video_type; /* video input type */
u8 audio_index; /* index in ivtv_card_audio_input array */
u16 video_input; /* hardware video input */
};
struct ivtv_card_audio_input {
u8 audio_type; /* audio input type */
u32 audio_input; /* hardware audio input */
u16 muxer_input; /* hardware muxer input for boards with a
multiplexer chip */
};
struct ivtv_card_output {
u8 name[32];
u16 video_output; /* hardware video output */
};
struct ivtv_card_pci_info {
u16 device;
u16 subsystem_vendor;
u16 subsystem_device;
};
/* GPIO definitions */
/* The mask is the set of bits used by the operation */
struct ivtv_gpio_init { /* set initial GPIO DIR and OUT values */
u16 direction; /* DIR setting. Leave to 0 if no init is needed */
u16 initial_value;
};
struct ivtv_gpio_video_input { /* select tuner/line in input */
u16 mask; /* leave to 0 if not supported */
u16 tuner;
u16 composite;
u16 svideo;
};
struct ivtv_gpio_audio_input { /* select tuner/line in input */
u16 mask; /* leave to 0 if not supported */
u16 tuner;
u16 linein;
u16 radio;
};
struct ivtv_gpio_audio_mute {
u16 mask; /* leave to 0 if not supported */
u16 mute; /* set this value to mute, 0 to unmute */
};
struct ivtv_gpio_audio_mode {
u16 mask; /* leave to 0 if not supported */
u16 mono; /* set audio to mono */
u16 stereo; /* set audio to stereo */
u16 lang1; /* set audio to the first language */
u16 lang2; /* set audio to the second language */
u16 both; /* both languages are output */
};
struct ivtv_gpio_audio_freq {
u16 mask; /* leave to 0 if not supported */
u16 f32000;
u16 f44100;
u16 f48000;
};
struct ivtv_gpio_audio_detect {
u16 mask; /* leave to 0 if not supported */
u16 stereo; /* if the input matches this value then
stereo is detected */
};
struct ivtv_card_tuner {
v4l2_std_id std; /* standard for which the tuner is suitable */
int tuner; /* tuner ID (from tuner.h) */
};
/* for card information/parameters */
struct ivtv_card {
int type;
char *name;
u32 v4l2_capabilities;
u32 hw_video; /* hardware used to process video */
u32 hw_audio; /* hardware used to process audio */
u32 hw_audio_ctrl; /* hardware used for the V4L2 controls (only 1 dev allowed) */
u32 hw_muxer; /* hardware used to multiplex audio input */
u32 hw_all; /* all hardware used by the board */
struct ivtv_card_video_input video_inputs[IVTV_CARD_MAX_VIDEO_INPUTS];
struct ivtv_card_audio_input audio_inputs[IVTV_CARD_MAX_AUDIO_INPUTS];
struct ivtv_card_audio_input radio_input;
int nof_outputs;
const struct ivtv_card_output *video_outputs;
u8 gr_config; /* config byte for the ghost reduction device */
/* GPIO card-specific settings */
struct ivtv_gpio_init gpio_init;
struct ivtv_gpio_video_input gpio_video_input;
struct ivtv_gpio_audio_input gpio_audio_input;
struct ivtv_gpio_audio_mute gpio_audio_mute;
struct ivtv_gpio_audio_mode gpio_audio_mode;
struct ivtv_gpio_audio_freq gpio_audio_freq;
struct ivtv_gpio_audio_detect gpio_audio_detect;
struct ivtv_card_tuner tuners[IVTV_CARD_MAX_TUNERS];
/* list of device and subsystem vendor/devices that
correspond to this card type. */
const struct ivtv_card_pci_info *pci_list;
};
int ivtv_get_input(struct ivtv *itv, u16 index, struct v4l2_input *input);
int ivtv_get_output(struct ivtv *itv, u16 index, struct v4l2_output *output);
int ivtv_get_audio_input(struct ivtv *itv, u16 index, struct v4l2_audio *input);
int ivtv_get_audio_output(struct ivtv *itv, u16 index, struct v4l2_audioout *output);
const struct ivtv_card *ivtv_get_card(u16 index);
/*
ioctl control functions
Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "ivtv-driver.h"
#include "ivtv-cards.h"
#include "ivtv-ioctl.h"
#include "ivtv-audio.h"
#include "ivtv-i2c.h"
#include "ivtv-mailbox.h"
#include "ivtv-controls.h"
static const u32 user_ctrls[] = {
V4L2_CID_USER_CLASS,
V4L2_CID_BRIGHTNESS,
V4L2_CID_CONTRAST,
V4L2_CID_SATURATION,
V4L2_CID_HUE,
V4L2_CID_AUDIO_VOLUME,
V4L2_CID_AUDIO_BALANCE,
V4L2_CID_AUDIO_BASS,
V4L2_CID_AUDIO_TREBLE,
V4L2_CID_AUDIO_MUTE,
V4L2_CID_AUDIO_LOUDNESS,
0
};
static const u32 *ctrl_classes[] = {
user_ctrls,
cx2341x_mpeg_ctrls,
NULL
};
static int ivtv_queryctrl(struct ivtv *itv, struct v4l2_queryctrl *qctrl)
{
const char *name;
IVTV_DEBUG_IOCTL("VIDIOC_QUERYCTRL(%08x)\n", qctrl->id);
qctrl->id = v4l2_ctrl_next(ctrl_classes, qctrl->id);
if (qctrl->id == 0)
return -EINVAL;
switch (qctrl->id) {
/* Standard V4L2 controls */
case V4L2_CID_BRIGHTNESS:
case V4L2_CID_HUE:
case V4L2_CID_SATURATION:
case V4L2_CID_CONTRAST:
if (itv->video_dec_func(itv, VIDIOC_QUERYCTRL, qctrl))
qctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
return 0;
case V4L2_CID_AUDIO_VOLUME:
case V4L2_CID_AUDIO_MUTE:
case V4L2_CID_AUDIO_BALANCE:
case V4L2_CID_AUDIO_BASS:
case V4L2_CID_AUDIO_TREBLE:
case V4L2_CID_AUDIO_LOUDNESS:
if (ivtv_i2c_hw(itv, itv->card->hw_audio_ctrl, VIDIOC_QUERYCTRL, qctrl))
qctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
return 0;
default:
if (cx2341x_ctrl_query(&itv->params, qctrl))
qctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
return 0;
}
strncpy(qctrl->name, name, sizeof(qctrl->name) - 1);
qctrl->name[sizeof(qctrl->name) - 1] = 0;
return 0;
}
static int ivtv_querymenu(struct ivtv *itv, struct v4l2_querymenu *qmenu)
{
struct v4l2_queryctrl qctrl;
qctrl.id = qmenu->id;
ivtv_queryctrl(itv, &qctrl);
return v4l2_ctrl_query_menu(qmenu, &qctrl, cx2341x_ctrl_get_menu(qmenu->id));
}
static int ivtv_s_ctrl(struct ivtv *itv, struct v4l2_control *vctrl)
{
s32 v = vctrl->value;
IVTV_DEBUG_IOCTL("VIDIOC_S_CTRL(%08x, %x)\n", vctrl->id, v);
switch (vctrl->id) {
/* Standard V4L2 controls */
case V4L2_CID_BRIGHTNESS:
case V4L2_CID_HUE:
case V4L2_CID_SATURATION:
case V4L2_CID_CONTRAST:
return itv->video_dec_func(itv, VIDIOC_S_CTRL, vctrl);
case V4L2_CID_AUDIO_VOLUME:
case V4L2_CID_AUDIO_MUTE:
case V4L2_CID_AUDIO_BALANCE:
case V4L2_CID_AUDIO_BASS:
case V4L2_CID_AUDIO_TREBLE:
case V4L2_CID_AUDIO_LOUDNESS:
return ivtv_i2c_hw(itv, itv->card->hw_audio_ctrl, VIDIOC_S_CTRL, vctrl);
default:
IVTV_DEBUG_IOCTL("invalid control %x\n", vctrl->id);
return -EINVAL;
}
return 0;
}
static int ivtv_g_ctrl(struct ivtv *itv, struct v4l2_control *vctrl)
{
IVTV_DEBUG_IOCTL("VIDIOC_G_CTRL(%08x)\n", vctrl->id);
switch (vctrl->id) {
/* Standard V4L2 controls */
case V4L2_CID_BRIGHTNESS:
case V4L2_CID_HUE:
case V4L2_CID_SATURATION:
case V4L2_CID_CONTRAST:
return itv->video_dec_func(itv, VIDIOC_G_CTRL, vctrl);
case V4L2_CID_AUDIO_VOLUME:
case V4L2_CID_AUDIO_MUTE:
case V4L2_CID_AUDIO_BALANCE:
case V4L2_CID_AUDIO_BASS:
case V4L2_CID_AUDIO_TREBLE:
case V4L2_CID_AUDIO_LOUDNESS:
return ivtv_i2c_hw(itv, itv->card->hw_audio_ctrl, VIDIOC_G_CTRL, vctrl);
default:
IVTV_DEBUG_IOCTL("invalid control %x\n", vctrl->id);
return -EINVAL;
}
return 0;
}
static int ivtv_setup_vbi_fmt(struct ivtv *itv, enum v4l2_mpeg_stream_vbi_fmt fmt)
{
if (!(itv->v4l2_cap & V4L2_CAP_SLICED_VBI_CAPTURE))
return -EINVAL;
if (atomic_read(&itv->capturing) > 0)
return -EBUSY;
/* First try to allocate sliced VBI buffers if needed. */
if (fmt && itv->vbi.sliced_mpeg_data[0] == NULL) {
int i;
for (i = 0; i < IVTV_VBI_FRAMES; i++) {
/* Yuck, hardcoded. Needs to be a define */
itv->vbi.sliced_mpeg_data[i] = kmalloc(2049, GFP_KERNEL);
if (itv->vbi.sliced_mpeg_data[i] == NULL) {
while (--i >= 0) {
kfree(itv->vbi.sliced_mpeg_data[i]);
itv->vbi.sliced_mpeg_data[i] = NULL;
}
return -ENOMEM;
}
}
}
itv->vbi.insert_mpeg = fmt;
if (itv->vbi.insert_mpeg == 0) {
return 0;
}
/* Need sliced data for mpeg insertion */
if (get_service_set(itv->vbi.sliced_in) == 0) {
if (itv->is_60hz)
itv->vbi.sliced_in->service_set = V4L2_SLICED_CAPTION_525;
else
itv->vbi.sliced_in->service_set = V4L2_SLICED_WSS_625;
expand_service_set(itv->vbi.sliced_in, itv->is_50hz);
}
return 0;
}
int ivtv_control_ioctls(struct ivtv *itv, unsigned int cmd, void *arg)
{
struct v4l2_control ctrl;
switch (cmd) {
case VIDIOC_QUERYMENU:
IVTV_DEBUG_IOCTL("VIDIOC_QUERYMENU\n");
return ivtv_querymenu(itv, arg);
case VIDIOC_QUERYCTRL:
return ivtv_queryctrl(itv, arg);
case VIDIOC_S_CTRL:
return ivtv_s_ctrl(itv, arg);
case VIDIOC_G_CTRL:
return ivtv_g_ctrl(itv, arg);
case VIDIOC_S_EXT_CTRLS:
{
struct v4l2_ext_controls *c = arg;
if (c->ctrl_class == V4L2_CTRL_CLASS_USER) {
int i;
int err = 0;
for (i = 0; i < c->count; i++) {
ctrl.id = c->controls[i].id;
ctrl.value = c->controls[i].value;
err = ivtv_s_ctrl(itv, &ctrl);
c->controls[i].value = ctrl.value;
if (err) {
c->error_idx = i;
break;
}
}
return err;
}
IVTV_DEBUG_IOCTL("VIDIOC_S_EXT_CTRLS\n");
if (c->ctrl_class == V4L2_CTRL_CLASS_MPEG) {
struct cx2341x_mpeg_params p = itv->params;
int err = cx2341x_ext_ctrls(&p, arg, cmd);
if (err)
return err;
if (p.video_encoding != itv->params.video_encoding) {
int is_mpeg1 = p.video_encoding ==
V4L2_MPEG_VIDEO_ENCODING_MPEG_1;
struct v4l2_format fmt;
/* fix videodecoder resolution */