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Date: Fri, 1 Sep 2017 07:45:13 -0300
From: Mauro Carvalho Chehab <mchehab@...pensource.com>
To: Honza Petrouš <jpetrous@...il.com>
Cc: Linux Doc Mailing List <linux-doc@...r.kernel.org>,
Linux Media Mailing List <linux-media@...r.kernel.org>,
Mauro Carvalho Chehab <mchehab@...radead.org>,
linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH 12/15] media: dmx.h: get rid of DMX_SET_SOURCE
Em Fri, 1 Sep 2017 11:53:11 +0200
Honza Petrouš <jpetrous@...il.com> escreveu:
> 2017-09-01 11:37 GMT+02:00 Mauro Carvalho Chehab <mchehab@...pensource.com>:
> > Em Fri, 1 Sep 2017 08:28:20 +0200
> > Honza Petrouš <jpetrous@...il.com> escreveu:
> >
> >> 2017-09-01 1:46 GMT+02:00 Mauro Carvalho Chehab <mchehab@...pensource.com>:
> >> > No driver uses this ioctl, nor it is documented anywhere.
> >> >
> >> > So, get rid of it.
> >> >
> >> > Signed-off-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
> >> > ---
> >> > Documentation/media/dmx.h.rst.exceptions | 13 --------
> >> > Documentation/media/uapi/dvb/dmx-set-source.rst | 44 -------------------------
> >> > Documentation/media/uapi/dvb/dmx_fcalls.rst | 1 -
> >> > Documentation/media/uapi/dvb/dmx_types.rst | 20 -----------
> >> > include/uapi/linux/dvb/dmx.h | 12 -------
> >> > 5 files changed, 90 deletions(-)
> >> > delete mode 100644 Documentation/media/uapi/dvb/dmx-set-source.rst
> >> >
> >> > diff --git a/Documentation/media/dmx.h.rst.exceptions b/Documentation/media/dmx.h.rst.exceptions
> >> > index 5572d2dc9d0e..d2dac35bb84b 100644
> >> > --- a/Documentation/media/dmx.h.rst.exceptions
> >> > +++ b/Documentation/media/dmx.h.rst.exceptions
> >> > @@ -40,18 +40,6 @@ replace enum dmx_input :c:type:`dmx_input`
> >> > replace symbol DMX_IN_FRONTEND :c:type:`dmx_input`
> >> > replace symbol DMX_IN_DVR :c:type:`dmx_input`
> >> >
> >> > -# dmx_source_t symbols
> >> > -replace enum dmx_source :c:type:`dmx_source`
> >> > -replace symbol DMX_SOURCE_FRONT0 :c:type:`dmx_source`
> >> > -replace symbol DMX_SOURCE_FRONT1 :c:type:`dmx_source`
> >> > -replace symbol DMX_SOURCE_FRONT2 :c:type:`dmx_source`
> >> > -replace symbol DMX_SOURCE_FRONT3 :c:type:`dmx_source`
> >> > -replace symbol DMX_SOURCE_DVR0 :c:type:`dmx_source`
> >> > -replace symbol DMX_SOURCE_DVR1 :c:type:`dmx_source`
> >> > -replace symbol DMX_SOURCE_DVR2 :c:type:`dmx_source`
> >> > -replace symbol DMX_SOURCE_DVR3 :c:type:`dmx_source`
> >> > -
> >> > -
> >> > # Flags for struct dmx_sct_filter_params
> >> > replace define DMX_CHECK_CRC :c:type:`dmx_sct_filter_params`
> >> > replace define DMX_ONESHOT :c:type:`dmx_sct_filter_params`
> >> > @@ -61,4 +49,3 @@ replace define DMX_IMMEDIATE_START :c:type:`dmx_sct_filter_params`
> >> > replace typedef dmx_filter_t :c:type:`dmx_filter`
> >> > replace typedef dmx_pes_type_t :c:type:`dmx_pes_type`
> >> > replace typedef dmx_input_t :c:type:`dmx_input`
> >> > -replace typedef dmx_source_t :c:type:`dmx_source`
> >> > diff --git a/Documentation/media/uapi/dvb/dmx-set-source.rst b/Documentation/media/uapi/dvb/dmx-set-source.rst
> >> > deleted file mode 100644
> >> > index ac7f77b25e06..000000000000
> >> > --- a/Documentation/media/uapi/dvb/dmx-set-source.rst
> >> > +++ /dev/null
> >> > @@ -1,44 +0,0 @@
> >> > -.. -*- coding: utf-8; mode: rst -*-
> >> > -
> >> > -.. _DMX_SET_SOURCE:
> >> > -
> >> > -==============
> >> > -DMX_SET_SOURCE
> >> > -==============
> >> > -
> >> > -Name
> >> > -----
> >> > -
> >> > -DMX_SET_SOURCE
> >> > -
> >> > -
> >> > -Synopsis
> >> > ---------
> >> > -
> >> > -.. c:function:: int ioctl(fd, DMX_SET_SOURCE, struct dmx_source *src)
> >> > - :name: DMX_SET_SOURCE
> >> > -
> >> > -
> >> > -Arguments
> >> > ----------
> >> > -
> >> > -
> >> > -``fd``
> >> > - File descriptor returned by :c:func:`open() <dvb-dmx-open>`.
> >> > -
> >> > -``src``
> >> > - Undocumented.
> >> > -
> >> > -
> >> > -Description
> >> > ------------
> >> > -
> >> > -.. note:: This ioctl is undocumented. Documentation is welcome.
> >> > -
> >> > -
> >> > -Return Value
> >> > -------------
> >> > -
> >> > -On success 0 is returned, on error -1 and the ``errno`` variable is set
> >> > -appropriately. The generic error codes are described at the
> >> > -:ref:`Generic Error Codes <gen-errors>` chapter.
> >> > diff --git a/Documentation/media/uapi/dvb/dmx_fcalls.rst b/Documentation/media/uapi/dvb/dmx_fcalls.rst
> >> > index 49e013d4540f..be98d60877f2 100644
> >> > --- a/Documentation/media/uapi/dvb/dmx_fcalls.rst
> >> > +++ b/Documentation/media/uapi/dvb/dmx_fcalls.rst
> >> > @@ -21,6 +21,5 @@ Demux Function Calls
> >> > dmx-get-event
> >> > dmx-get-stc
> >> > dmx-get-pes-pids
> >> > - dmx-set-source
> >> > dmx-add-pid
> >> > dmx-remove-pid
> >> > diff --git a/Documentation/media/uapi/dvb/dmx_types.rst b/Documentation/media/uapi/dvb/dmx_types.rst
> >> > index 9e907b85cf16..a205c02ccdc1 100644
> >> > --- a/Documentation/media/uapi/dvb/dmx_types.rst
> >> > +++ b/Documentation/media/uapi/dvb/dmx_types.rst
> >> > @@ -197,23 +197,3 @@ struct dmx_stc
> >> > unsigned int base; /* output: divisor for stc to get 90 kHz clock */
> >> > __u64 stc; /* output: stc in 'base'*90 kHz units */
> >> > };
> >> > -
> >> > -
> >> > -
> >> > -enum dmx_source
> >> > -===============
> >> > -
> >> > -.. c:type:: dmx_source
> >> > -
> >> > -.. code-block:: c
> >> > -
> >> > - typedef enum dmx_source {
> >> > - DMX_SOURCE_FRONT0 = 0,
> >> > - DMX_SOURCE_FRONT1,
> >> > - DMX_SOURCE_FRONT2,
> >> > - DMX_SOURCE_FRONT3,
> >> > - DMX_SOURCE_DVR0 = 16,
> >> > - DMX_SOURCE_DVR1,
> >> > - DMX_SOURCE_DVR2,
> >> > - DMX_SOURCE_DVR3
> >> > - } dmx_source_t;
> >> > diff --git a/include/uapi/linux/dvb/dmx.h b/include/uapi/linux/dvb/dmx.h
> >> > index c0ee44fbdb13..dd2b832c02ce 100644
> >> > --- a/include/uapi/linux/dvb/dmx.h
> >> > +++ b/include/uapi/linux/dvb/dmx.h
> >> > @@ -117,17 +117,6 @@ struct dmx_pes_filter_params
> >> > __u32 flags;
> >> > };
> >> >
> >> > -typedef enum dmx_source {
> >> > - DMX_SOURCE_FRONT0 = 0,
> >> > - DMX_SOURCE_FRONT1,
> >> > - DMX_SOURCE_FRONT2,
> >> > - DMX_SOURCE_FRONT3,
> >> > - DMX_SOURCE_DVR0 = 16,
> >> > - DMX_SOURCE_DVR1,
> >> > - DMX_SOURCE_DVR2,
> >> > - DMX_SOURCE_DVR3
> >> > -} dmx_source_t;
> >> > -
> >> > struct dmx_stc {
> >> > unsigned int num; /* input : which STC? 0..N */
> >> > unsigned int base; /* output: divisor for stc to get 90 kHz clock */
> >> > @@ -140,7 +129,6 @@ struct dmx_stc {
> >> > #define DMX_SET_PES_FILTER _IOW('o', 44, struct dmx_pes_filter_params)
> >> > #define DMX_SET_BUFFER_SIZE _IO('o', 45)
> >> > #define DMX_GET_PES_PIDS _IOR('o', 47, __u16[5])
> >> > -#define DMX_SET_SOURCE _IOW('o', 49, dmx_source_t)
> >> > #define DMX_GET_STC _IOWR('o', 50, struct dmx_stc)
> >> > #define DMX_ADD_PID _IOW('o', 51, __u16)
> >> > #define DMX_REMOVE_PID _IOW('o', 52, __u16)
> >> > --
> >> > 2.13.5
> >> >
> >>
> >> Hi Mauro.
> >>
> >> May be I missed something, but how it should be managed the demux
> >> source without that?
> >> Do we have some other way how to set the demux input?
> >
> > Yes: via the media controller.
> >
> >> Even in one-frontend configuration we should have to have option
> >> to switch between DMX_SOURCE_FRONT0 & DMX_SOURCE_DVR0.
> >
> > Actually, the sources are configured when a filter is set. I've
>
> Do you mean in DMX_SET_FILTER?
>
> I don't see any way how to do it inside struct:
>
> struct dmx_sct_filter_params
> {
> __u16 pid;
> dmx_filter_t filter;
> __u32 timeout;
> __u32 flags;
> #define DMX_CHECK_CRC 1
> #define DMX_ONESHOT 2
> #define DMX_IMMEDIATE_START 4
> #define DMX_KERNEL_CLIENT 0x8000
> };
No, I'm actually talking about DMX_SET_PES_FILTER filter:
struct dmx_pes_filter_params
{
__u16 pid;
enum dmx_input input;
enum dmx_output output;
enum dmx_ts_pes pes_type;
__u32 flags;
};
it explicitly allows setting both input and output, per PES filter.
> And more - I don't see any reason why it should be done in filter set.
> It looks for me like superfluous side-effect. The setting
> of the demux source should not be connected with filter setup.
>
> > no idea what was the original purpose of this API, as there's no
> > documentation about it anywhere and no drivers use it kernelwide.
>
> If I remember correctly, the original idea (or at least how I remember it) was
> to switch source of TS data - from frontend or from dvr (injecting
> from userspace).
Well, nobody implemented it (at least upstream).
Thanks,
Mauro
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