75 строки
2.4 KiB
C
75 строки
2.4 KiB
C
/* 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 <shuah@kernel.org>
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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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