android_kernel_xiaomi_sm8350/include/linux/dvb/dmx.h
Peter Hartley b01cd93789 V4L/DVB (7293): DMX_OUT_TSDEMUX_TAP: record two streams from same mux, resend
Currently (in linux-2.6.24, but linux-dvb hg looks similar), the
dmx_output_t in the dmx_pes_filter_params decides two things: whether
output is sent to demux0 or dvr0 (in dmxdev.c:dvb_dmxdev_ts_callback),
*and* whether to depacketise TS (in dmxdev.c:dvb_dmxdev_filter_start).
As it stands, those two things can't be set independently: output
destined for demux0 is depacketised, output for dvr0 isn't.

This is what you want for capturing multiple audio streams from the same
multiplex simultaneously: open demux0 several times and send
depacketised output there. And capturing a single video stream is fine
not what you want: you want multi-open (so demux0, not dvr0), but you
want the TS nature preserved (because that's what you want on output, as
you're going to re-multiplex it with the audio).

At least one existing solution -- GStreamer -- sends all its streams
simultaneously via dvr0 and demuxes again in userland, but it seems a
bit of a shame to pick out all the PIDs in kernel, stick them back
together in kernel, and send them to userland only to get unpicked
again, when the alternative is such a small API addition.

The attached patch adds a new value for dmx_output_t:
DMX_OUT_TSDEMUX_TAP, which sends TS to the demux0 device. With this
patch and a dvb-usb-dib0700 (and UK Freeview from Sandy Heath), I can
successfully capture an audio/video PID pair into a TS file that mplayer
can play back.

Signed-off-by: Peter Hartley <pdh@utter.chaos.org.uk>
Acked-by: Andreas Oberritter <obi@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-24 14:07:46 -03:00

156 lines
3.8 KiB
C

/*
* dmx.h
*
* Copyright (C) 2000 Marcus Metzler <marcus@convergence.de>
* & Ralph Metzler <ralph@convergence.de>
* for convergence integrated media GmbH
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* 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 Lesser 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.
*
*/
#ifndef _DVBDMX_H_
#define _DVBDMX_H_
#include <asm/types.h>
#ifdef __KERNEL__
#include <linux/time.h>
#else
#include <time.h>
#endif
#define DMX_FILTER_SIZE 16
typedef enum
{
DMX_OUT_DECODER, /* Streaming directly to decoder. */
DMX_OUT_TAP, /* Output going to a memory buffer */
/* (to be retrieved via the read command).*/
DMX_OUT_TS_TAP, /* Output multiplexed into a new TS */
/* (to be retrieved by reading from the */
/* logical DVR device). */
DMX_OUT_TSDEMUX_TAP /* Like TS_TAP but retrieved from the DMX device */
} dmx_output_t;
typedef enum
{
DMX_IN_FRONTEND, /* Input from a front-end device. */
DMX_IN_DVR /* Input from the logical DVR device. */
} dmx_input_t;
typedef enum
{
DMX_PES_AUDIO0,
DMX_PES_VIDEO0,
DMX_PES_TELETEXT0,
DMX_PES_SUBTITLE0,
DMX_PES_PCR0,
DMX_PES_AUDIO1,
DMX_PES_VIDEO1,
DMX_PES_TELETEXT1,
DMX_PES_SUBTITLE1,
DMX_PES_PCR1,
DMX_PES_AUDIO2,
DMX_PES_VIDEO2,
DMX_PES_TELETEXT2,
DMX_PES_SUBTITLE2,
DMX_PES_PCR2,
DMX_PES_AUDIO3,
DMX_PES_VIDEO3,
DMX_PES_TELETEXT3,
DMX_PES_SUBTITLE3,
DMX_PES_PCR3,
DMX_PES_OTHER
} dmx_pes_type_t;
#define DMX_PES_AUDIO DMX_PES_AUDIO0
#define DMX_PES_VIDEO DMX_PES_VIDEO0
#define DMX_PES_TELETEXT DMX_PES_TELETEXT0
#define DMX_PES_SUBTITLE DMX_PES_SUBTITLE0
#define DMX_PES_PCR DMX_PES_PCR0
typedef struct dmx_filter
{
__u8 filter[DMX_FILTER_SIZE];
__u8 mask[DMX_FILTER_SIZE];
__u8 mode[DMX_FILTER_SIZE];
} dmx_filter_t;
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
};
struct dmx_pes_filter_params
{
__u16 pid;
dmx_input_t input;
dmx_output_t output;
dmx_pes_type_t pes_type;
__u32 flags;
};
typedef struct dmx_caps {
__u32 caps;
int num_decoders;
} dmx_caps_t;
typedef enum {
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 */
__u64 stc; /* output: stc in 'base'*90 kHz units */
};
#define DMX_START _IO('o', 41)
#define DMX_STOP _IO('o', 42)
#define DMX_SET_FILTER _IOW('o', 43, struct dmx_sct_filter_params)
#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_GET_CAPS _IOR('o', 48, dmx_caps_t)
#define DMX_SET_SOURCE _IOW('o', 49, dmx_source_t)
#define DMX_GET_STC _IOWR('o', 50, struct dmx_stc)
#endif /*_DVBDMX_H_*/