Re: Beholder card M6 with MPEG2 coder

["Hans Verkuil" <hverkuil@xxxxxxxxx>]

> Hi Hans
>
>> > > > I found next problems with empress :)))
>> > > >
>> > > > I can`t get via v4l2-ctl list of external control for control
>> > > > MPEG settings via this tool. --list-ctrls and --list-ctrls-menus
>> > > > In debug log I can see only one call empress_querycap nothink
>> > > > vidioc_g_ext_ctrls/empress_g_ext_ctrls calls. Didn`t work
>> > > > v4l2-ctl --log-status
>> > >
>> > > just a late/early note on this, I'm still without a working
>> > > empress device.
>> > >
>> > > After you have fixed several bugs on the empress ioctl2
>> > > conversion, you are still the first user after years and now hit
>> > > mpeg extended controls, Hans from the ivtv project kindly
>> > > introduced, but he is also without any such device and the stuff
>> > > is completely untested.
>> > >
>> > > As far I know, there are no handlers yet to modify the parameters.
>> >
>> > Does this command work for ivtv cards?? Can somebody show me a
>> > sample command line and output from ivtv (or from another card with
>> > its own MPEG encoder)? I need to get control settings of MPEG.
>> > I don't see how I can test this thing in Beholder.
>>
>> Hmm, the empress is broken: the required queryctrl ioctls are
>> completely missing.
>
> Frederic was help me to writing simple programm for configuring MPEG.
>
> This programm start_mpeg here:
>
> #include <stdio.h>
> #include <unistd.h>
> #include <string.h>
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <sys/ioctl.h>
> #include <fcntl.h>
> #include "linux/videodev.h"
>
> int main(void){
>
> /* sets mpeg parameters */
>    struct v4l2_ext_controls mc;
>    struct v4l2_ext_control ctrls[32];
>    mc.ctrl_class = V4L2_CTRL_CLASS_MPEG;
>    mc.controls = ctrls;
>    int fd=0;
>    char *device="/dev/video1";
>
>    int i;
>
>    int false;
>
>    int m_iVideoBR;
>    int m_iVideoMaxBR;
>    int m_iVideoVBR;
>    int m_iAudioBR;
>    int m_uiAspectRatio;
>
>    if ((fd = open(device, O_RDONLY)) < 0) {
>      printf("Couldn't open video1\n");
> 		return(-1);
>    }
>
>    /* Test defines start */
>    false  = 0;
>    m_iVideoBR = 7500;
>    m_iVideoMaxBR = 9200;
>    m_iVideoVBR = 0;
>    m_iAudioBR = 256;
>    m_uiAspectRatio = 0;
>    /* Test defines stop */
>    i = 0;
>    mc.ctrl_class = V4L2_CTRL_CLASS_MPEG;
>    ctrls[i].id = V4L2_CID_MPEG_VIDEO_BITRATE_MODE;
>    ctrls[i++].value = (m_iVideoVBR ? V4L2_MPEG_VIDEO_BITRATE_MODE_VBR :
> V4L2_MPEG_VIDEO_BITRATE_MODE_CBR);
>    ctrls[i].id = V4L2_CID_MPEG_AUDIO_MUTE;
>    ctrls[i++].value = false;
>    ctrls[i].id = V4L2_CID_MPEG_VIDEO_MUTE;
>    ctrls[i++].value = false;
> //  ctrls[i].id = V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ;
> //  ctrls[i++].value = V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000;
>    ctrls[i].id = V4L2_CID_MPEG_AUDIO_ENCODING;
>    ctrls[i++].value = V4L2_MPEG_AUDIO_ENCODING_LAYER_2;
>    ctrls[i].id = V4L2_CID_MPEG_AUDIO_L2_BITRATE;
>    ctrls[i++].value = (m_iAudioBR==256) ?
> V4L2_MPEG_AUDIO_L2_BITRATE_256K : V4L2_MPEG_AUDIO_L2_BITRATE_384K;
>    ctrls[i].id = V4L2_CID_MPEG_VIDEO_BITRATE;
>    ctrls[i++].value = m_iVideoBR * 1000;
>    ctrls[i].id = V4L2_CID_MPEG_VIDEO_BITRATE_PEAK;
>    ctrls[i++].value = m_iVideoMaxBR * 1000;
>    ctrls[i].id = V4L2_CID_MPEG_VIDEO_ASPECT;
>    switch (m_uiAspectRatio)
>    {
>      case 0: ctrls[i++].value = V4L2_MPEG_VIDEO_ASPECT_1x1; break;
>      case 2: ctrls[i++].value = V4L2_MPEG_VIDEO_ASPECT_16x9; break;
>      case 3: ctrls[i++].value = V4L2_MPEG_VIDEO_ASPECT_221x100; break;
>      default: ctrls[i++].value = V4L2_MPEG_VIDEO_ASPECT_4x3; break;
>    }
>    mc.count = i;
>    if (ioctl(fd, VIDIOC_S_EXT_CTRLS, &mc) < 0) {
>      printf("Mpeg parameters cannot be set !\n");
>    }
>   close (fd);
>
>   return (0);
> }
>
> Start MPEG script here:
>
> ./v4l2-ctl --set-freq=175.0 -d /dev/video0
> ./v4l2-ctl --set-input=0 -d /dev/video0
> ./v4l2-ctl -s=secam-d -d /dev/video0
> ./start_mpeg
>
> In debug log I see:
>
> DEBUG: ts_open() start
> DEBUG: ts_open() stop
> DEBUG: empress_s_ext_ctrls() start
> DEBUG: ts_init_encoder() start
> DEBUG: ts_reset_encoder() start
> DEBUG: ts_init_encoder() stop
> DEBUG: empress_s_ext_ctrls() stop
> DEBUG: ts_release() start
> DEBUG: ts_reset_encoder() start
> DEBUG: ts_reset_encoder() stop
> DEBUG: ts_release() stop
>
> But when I try:
> cat /dev/video1 I get Input/Output error
>
> In debug log :
>
> DEBUG: ts_open() start
> DEBUG: ts_open() stop
> DEBUG: ts_init_encoder() start
> DEBUG: ts_reset_encoder() start
> DEBUG: ts_init_encoder() stop
> DEBUG: buffer_setup() start
> DEBUG: buffer_setup() stop
> DEBUG: buffer_prepare() start
> DEBUG: line = 64
> DEBUG: size = 12032
> DEBUG: buffer_prepare() stop
> DEBUG: buffer_prepare() start
> DEBUG: line = 64
> DEBUG: size = 12032
> DEBUG: buffer_prepare() stop
> DEBUG: buffer_prepare() start
> DEBUG: line = 64
> DEBUG: size = 12032
> DEBUG: buffer_prepare() stop
> DEBUG: buffer_prepare() start
> DEBUG: line = 64
> DEBUG: size = 12032
> DEBUG: buffer_prepare() stop
> DEBUG: buffer_prepare() start
> DEBUG: line = 64
> DEBUG: size = 12032
> DEBUG: buffer_prepare() stop
> DEBUG: buffer_prepare() start
> DEBUG: line = 64
> DEBUG: size = 12032
> DEBUG: buffer_prepare() stop
> DEBUG: buffer_prepare() start
> DEBUG: line = 64
> DEBUG: size = 12032
> DEBUG: buffer_prepare() stop
> DEBUG: buffer_prepare() start
> DEBUG: line = 64
> DEBUG: size = 12032
> DEBUG: buffer_prepare() stop
> DEBUG: buffer_queue() start
> DEBUG: buffer_queue() stop
> DEBUG: buffer_queue() start
> DEBUG: buffer_activate() start
> DEBUG: buffer_activate() stop
> DEBUG: buffer_queue() stop
> DEBUG: buffer_queue() start
> DEBUG: buffer_queue() stop
> DEBUG: buffer_queue() start
> DEBUG: buffer_queue() stop
> DEBUG: buffer_queue() start
> DEBUG: buffer_queue() stop
> DEBUG: buffer_queue() start
> DEBUG: buffer_queue() stop
> DEBUG: buffer_queue() start
> DEBUG: buffer_queue() stop
> DEBUG: buffer_queue() start
> DEBUG: buffer_queue() stop
> DEBUG: buffer_activate() start
> DEBUG: buffer_activate() stop
> DEBUG: buffer_activate() start
> DEBUG: buffer_activate() stop
> DEBUG: buffer_queue() start
> DEBUG: buffer_queue() stop
> DEBUG: ts_release() start
> DEBUG: buffer_release() start
> DEBUG: buffer_release() stop
> DEBUG: buffer_release() start
> DEBUG: buffer_release() stop
> DEBUG: buffer_release() start
> DEBUG: buffer_release() stop
> DEBUG: buffer_release() start
> DEBUG: buffer_release() stop
> DEBUG: buffer_release() start
> DEBUG: buffer_release() stop
> DEBUG: buffer_release() start
> DEBUG: buffer_release() stop
> DEBUG: buffer_release() start
> DEBUG: buffer_release() stop
> DEBUG: buffer_release() start
> DEBUG: buffer_release() stop
> DEBUG: buffer_release() start
> DEBUG: buffer_release() stop
> DEBUG: buffer_release() start
> DEBUG: buffer_release() stop
> DEBUG: buffer_release() start
> DEBUG: buffer_release() stop
> DEBUG: buffer_release() start
> DEBUG: buffer_release() stop
> DEBUG: buffer_release() start
> DEBUG: buffer_release() stop
> DEBUG: buffer_release() start
> DEBUG: buffer_release() stop
> DEBUG: buffer_release() start
> DEBUG: buffer_release() stop
> DEBUG: buffer_release() start
> DEBUG: buffer_release() stop
> DEBUG: ts_reset_encoder() start
> DEBUG: ts_reset_encoder() stop
> DEBUG: ts_release() stop
>
> I don't understand why stream was stopped.
>
>> The only way to change MPEG settings is to hardcode it in a program,
>> calling VIDIOC_S_EXT_CTRLS directly with the controls that
>> handle_ctrl() in saa6752.c understands.
>
> Yes, but more better fix v4l2-ctl and empress module.

v4l2-ctl is fine, it's the empress module that's broken.

Regards,

         Hans

> With my best regards, Dmitry.
>


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