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dmix: add S24_3LE support

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Add to the dmix plugin support for the S24_3LE sample format which is
used by 24-bit USB devices.

The optimized assembler version uses only 23 bits for sample data so
that the lowest bit can be used for synchronization because there is no
24-bit cmpxchg instruction.
This commit is contained in:
Clemens Ladisch 2005-12-19 07:39:03 +00:00
parent 46f81f994b
commit 45f63a8735
8 changed files with 404 additions and 7 deletions
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6
src/pcm/pcm_direct.h
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@ -34,6 +34,11 @@ typedef void (mix_areas2_t)(unsigned int size,
volatile signed int *sum, size_t dst_step,
size_t src_step, size_t sum_step);
typedef void (mix_areas3_t)(unsigned int size,
volatile unsigned char *dst, unsigned char *src,
volatile signed int *sum, size_t dst_step,
size_t src_step, size_t sum_step);
struct slave_params {
snd_pcm_format_t format;
int rate;
@ -120,6 +125,7 @@ struct snd_pcm_direct {
signed int *sum_buffer; /* shared sum buffer */
mix_areas1_t *mix_areas1;
mix_areas2_t *mix_areas2;
mix_areas3_t *mix_areas3;
} dmix;
struct {
} dsnoop;