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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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36
spa/plugins/alsa/compress-offload-api-util.c Normal file
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#include <errno.h>
#include <inttypes.h>
#include "compress-offload-api.h"
#include "compress-offload-api-util.h"
int get_compress_offload_device_direction(int card_nr, int device_nr,
struct spa_log *log,
enum spa_compress_offload_direction *direction)
{
int ret = 0;
struct compress_offload_api_context *device_context;
const struct snd_compr_caps *compr_caps;
device_context = compress_offload_api_open(card_nr, device_nr, log);
if (device_context == NULL)
return -errno;
compr_caps = compress_offload_api_get_caps(device_context);
switch (compr_caps->direction) {
case SND_COMPRESS_PLAYBACK:
*direction = SPA_COMPRESS_OFFLOAD_DIRECTION_PLAYBACK;
break;
case SND_COMPRESS_CAPTURE:
*direction = SPA_COMPRESS_OFFLOAD_DIRECTION_CAPTURE;
break;
default:
spa_log_error(log, "card nr %d device nr %d: unknown direction %#" PRIx32,
card_nr, device_nr, (uint32_t)(compr_caps->direction));
ret = -EINVAL;
}
compress_offload_api_close(device_context);
return ret;
}