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authorPeter Hartley <pdh@utter.chaos.org.uk>2008-04-22 14:45:36 -0300
committerMauro Carvalho Chehab <mchehab@infradead.org>2008-04-24 14:07:46 -0300
commitb01cd937895ad4114a07114cfb6b8b5d2be52241 (patch)
treecf0046fa0228b07a214e2e601f9a4d1f61e7cc63
parent3c66e4e18b250f4524f24fd5b4ccdcd12bef9cc2 (diff)
downloadop-kernel-dev-b01cd937895ad4114a07114cfb6b8b5d2be52241.zip
op-kernel-dev-b01cd937895ad4114a07114cfb6b8b5d2be52241.tar.gz
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>
-rw-r--r--drivers/media/dvb/dvb-core/dmxdev.c5
-rw-r--r--include/linux/dvb/dmx.h3
2 files changed, 5 insertions, 3 deletions
diff --git a/drivers/media/dvb/dvb-core/dmxdev.c b/drivers/media/dvb/dvb-core/dmxdev.c
index f94bc31..e7f7aef 100644
--- a/drivers/media/dvb/dvb-core/dmxdev.c
+++ b/drivers/media/dvb/dvb-core/dmxdev.c
@@ -374,7 +374,8 @@ static int dvb_dmxdev_ts_callback(const u8 *buffer1, size_t buffer1_len,
return 0;
}
- if (dmxdevfilter->params.pes.output == DMX_OUT_TAP)
+ if (dmxdevfilter->params.pes.output == DMX_OUT_TAP
+ || dmxdevfilter->params.pes.output == DMX_OUT_TSDEMUX_TAP)
buffer = &dmxdevfilter->buffer;
else
buffer = &dmxdevfilter->dev->dvr_buffer;
@@ -618,7 +619,7 @@ static int dvb_dmxdev_filter_start(struct dmxdev_filter *filter)
else
ts_type = 0;
- if (otype == DMX_OUT_TS_TAP)
+ if (otype == DMX_OUT_TS_TAP || otype == DMX_OUT_TSDEMUX_TAP)
ts_type |= TS_PACKET;
if (otype == DMX_OUT_TAP)
diff --git a/include/linux/dvb/dmx.h b/include/linux/dvb/dmx.h
index c6a2353..402fb7a 100644
--- a/include/linux/dvb/dmx.h
+++ b/include/linux/dvb/dmx.h
@@ -39,9 +39,10 @@ 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 */
+ 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;
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