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alsa-compress-offload: Add device object and udev based autodetection

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As part of this, in alsa-udev.c, certain structures and variables referred
to as "device" are renamed to "card". Otherwise, there is ambiguity, since
"device" can mean a udev device, an SPA device, a compress-offload device,
a PCM device etc.

Also, replace "card id" with "card number" to emphasize that these integers
are not actually SPA object IDs.
This commit is contained in:
Carlos Rafael Giani 2023-08-30 23:52:14 +02:00 • committed by Wim Taymans
parent ae4bff78a3
commit 8e6d070148
8 changed files with 1050 additions and 237 deletions
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30
spa/plugins/alsa/compress-offload-api-util.h Normal file
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#ifndef SPA_ALSA_COMPRESS_OFFLOAD_DEVICE_UTIL_H
#define SPA_ALSA_COMPRESS_OFFLOAD_DEVICE_UTIL_H
#include <spa/support/log.h>
#if defined(__GNUC__) && __GNUC__ >= 4
#define COMPR_API_PRIVATE __attribute__((visibility("hidden")))
#elif defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)
#define COMPR_API_PRIVATE __attribute__((visibility("hidden")))
#elif defined(__SUNPRO_C) && (__SUNPRO_C >= 0x550)
#define COMPR_API_PRIVATE __hidden
#else
#define COMPR_API_PRIVATE
#endif
enum spa_compress_offload_direction {
SPA_COMPRESS_OFFLOAD_DIRECTION_PLAYBACK,
SPA_COMPRESS_OFFLOAD_DIRECTION_CAPTURE
};
/* This exists for situations where both the direction of the compress-offload
* device and the functions from asoundlib.h are needed. It is not possible to
* include asoundlib.h and the compress-offload headers in the same C file,
* since these headers contain conflicting declarations. Provide this direction
* check function to keep the compress-offload headers encapsulated. */
COMPR_API_PRIVATE int get_compress_offload_device_direction(int card_nr, int device_nr,
struct spa_log *log,
enum spa_compress_offload_direction *direction);
#endif /* SPA_ALSA_COMPRESS_OFFLOAD_DEVICE_UTIL_H */