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ump_msg: Add a new helper snd_ump_get_byte()

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For making it easier to extract a byte from the UMP packet no matter
which endian is used, introduce a new helper function
snd_ump_get_byte().  It'll be useful for retrieving SysEx byte or a
name string.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2024-07-28 10:46:11 +02:00
parent 530e2f8131
commit 28948f2fcc
1 changed files with 12 additions and 0 deletions
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12
include/ump_msg.h
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@ -1001,6 +1001,18 @@ static inline uint8_t snd_ump_sysex_msg_length(const uint32_t *ump)
return (*ump >> 16) & 0xf; return (*ump >> 16) & 0xf;
} }
/**
* \brief extract one byte from a UMP packet
*/
static inline uint8_t snd_ump_get_byte(const uint32_t *ump, unsigned int offset)
{
#ifdef SNDRV_BIG_ENDIAN
return ((const uint8_t *)ump)[offset];
#else
return ((const uint8_t *)ump)[(offset & ~3) | (3 - (offset & 3))];
#endif
}
int snd_ump_msg_sysex_expand(const uint32_t *ump, uint8_t *buf, size_t maxlen, int snd_ump_msg_sysex_expand(const uint32_t *ump, uint8_t *buf, size_t maxlen,
size_t *filled); size_t *filled);
int snd_ump_packet_length(unsigned int type); int snd_ump_packet_length(unsigned int type);