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[media] v4l2-mc.h: Split audio from baseband output 

Analog TV tuners have a separate output pad for the audio
IF or audio sampled data. This pad is connected to a different
chipset.

Add an extra pad for it and improve the documentation.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
hifive-unleashed-5.1
Mauro Carvalho Chehab 2016-01-29 07:00:08 -02:00
parent 6aad127d37
commit 5c9077eabc
2 changed files with 18 additions and 11 deletions
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1
drivers/media/v4l2-core/tuner-core.c
View File

@ -698,6 +698,7 @@ register_client:
#if defined(CONFIG_MEDIA_CONTROLLER)
t->pad[TUNER_PAD_RF_INPUT].flags = MEDIA_PAD_FL_SINK;
t->pad[TUNER_PAD_OUTPUT].flags = MEDIA_PAD_FL_SOURCE;
t->pad[TUNER_PAD_AUD_OUT].flags = MEDIA_PAD_FL_SOURCE;
t->sd.entity.function = MEDIA_ENT_F_TUNER;
t->sd.entity.name = t->name;

28
include/media/v4l2-mc.h
View File

@ -19,20 +19,26 @@
*
* @TUNER_PAD_RF_INPUT: Radiofrequency (RF) sink pad, usually linked to a
* RF connector entity.
* @TUNER_PAD_OUTPUT: Tuner output pad. This is actually more complex than
* a single pad output, as, in addition to luminance and
* chrominance IF a tuner may have internally an
* audio decoder (like xc3028) or it may produce an audio
* IF that will be used by an audio decoder like msp34xx.
* It may also have an IF-PLL demodulator on it, like
* tuners with tda9887. Yet, currently, we don't need to
* represent all the dirty details, as this is transparent
* for the V4L2 API usage. So, let's represent all kinds
* of different outputs as a single source pad.
* @TUNER_PAD_OUTPUT: Tuner video output source pad. Contains the video
* chrominance and luminance or the hole bandwidth
* of the signal converted to an Intermediate Frequency
* (IF) or to baseband (on zero-IF tuners).
* @TUNER_PAD_AUD_OUT: Tuner audio output source pad. Tuners used to decode
* analog TV signals have an extra pad for audio output.
* Old tuners use an analog stage with a saw filter for
* the audio IF frequency. The output of the pad is, in
* this case, the audio IF, with should be decoded either
* by the bridge chipset (that's the case of cx2388x
* chipsets) or may require an external IF sound
* processor, like msp34xx. On modern silicon tuners,
* the audio IF decoder is usually incorporated at the
* tuner. On such case, the output of this pad is an
* audio sampled data.
* @TUNER_NUM_PADS: Number of pads of the tuner.
*/
enum tuner_pad_index {
TUNER_PAD_RF_INPUT,
TUNER_PAD_OUTPUT,
TUNER_PAD_AUD_OUT,
TUNER_NUM_PADS
};
};