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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/sound/usb/media.h
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/* SPDX-License-Identifier: GPL-2.0+ */

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/*

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 * media.h - Media Controller specific ALSA driver code

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 *

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 * Copyright (c) 2019 Shuah Khan <[email protected]>

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 *

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 */

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/*

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 * This file adds Media Controller support to the ALSA driver

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 * to use the Media Controller API to share the tuner with DVB

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 * and V4L2 drivers that control the media device.

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 *

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 * The media device is created based on the existing quirks framework.

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 * Using this approach, the media controller API usage can be added for

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 * a specific device.

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 */

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#ifndef __MEDIA_H

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#ifdef CONFIG_SND_USB_AUDIO_USE_MEDIA_CONTROLLER

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#include <linux/media.h>

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#include <media/media-device.h>

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#include <media/media-entity.h>

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#include <media/media-dev-allocator.h>

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#include <sound/asound.h>

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struct media_ctl {

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	struct media_device *media_dev;

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	struct media_entity media_entity;

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	struct media_intf_devnode *intf_devnode;

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	struct media_link *intf_link;

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	struct media_pad media_pad;

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	struct media_pipeline media_pipe;

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};

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/*

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 * One source pad each for SNDRV_PCM_STREAM_CAPTURE and

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 * SNDRV_PCM_STREAM_PLAYBACK. One for sink pad to link

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 * to AUDIO Source

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 */

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#define MEDIA_MIXER_PAD_MAX    (SNDRV_PCM_STREAM_LAST + 2)

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struct media_mixer_ctl {

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	struct media_device *media_dev;

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	struct media_entity media_entity;

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	struct media_intf_devnode *intf_devnode;

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	struct media_link *intf_link;

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	struct media_pad media_pad[MEDIA_MIXER_PAD_MAX];

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	struct media_pipeline media_pipe;

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};

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int snd_media_device_create(struct snd_usb_audio *chip,

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			    struct usb_interface *iface);

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void snd_media_device_delete(struct snd_usb_audio *chip);

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int snd_media_stream_init(struct snd_usb_substream *subs, struct snd_pcm *pcm,

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			  int stream);

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void snd_media_stream_delete(struct snd_usb_substream *subs);

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int snd_media_start_pipeline(struct snd_usb_substream *subs);

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void snd_media_stop_pipeline(struct snd_usb_substream *subs);

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#else

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static inline int snd_media_device_create(struct snd_usb_audio *chip,

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					  struct usb_interface *iface)

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						{ return 0; }

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static inline void snd_media_device_delete(struct snd_usb_audio *chip) { }

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static inline int snd_media_stream_init(struct snd_usb_substream *subs,

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					struct snd_pcm *pcm, int stream)

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						{ return 0; }

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static inline void snd_media_stream_delete(struct snd_usb_substream *subs) { }

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static inline int snd_media_start_pipeline(struct snd_usb_substream *subs)

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					{ return 0; }

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static inline void snd_media_stop_pipeline(struct snd_usb_substream *subs) { }

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#endif

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#endif /* __MEDIA_H */

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