Commit 5c9077ea authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
Browse files

[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: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
parent 6aad127d

drivers/media/v4l2-core/tuner-core.c

+1 −0
Original line number Diff line number Diff line
@@ -698,6 +698,7 @@ static int tuner_probe(struct i2c_client *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;

include/media/v4l2-mc.h

+17 −11
Original line number Diff line number Diff line
@@ -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

};