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Abramo Bagnara <abramo@alsa-project.org>

Browse source 
Sat, 11 Dec 1999 08:45:24 +0100
- changed lowlevel drivers to use pcm_misc.c functions
- fixed some bugs in pcm_plugin_build
- the plugin code is shared between alsa-lib and alsa-driver
This commit is contained in:
Jaroslav Kysela 1999-12-11 11:46:05 +00:00
parent 0f0ce09509
commit 20ebae20a7
13 changed files with 596 additions and 508 deletions
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44
src/pcm/plugin/rate.c
View file

@ -19,6 +19,10 @@
*
*/
#ifdef __KERNEL__
#include "../../include/driver.h"
#include "../../include/pcm_plugin.h"
#else
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
@ -27,6 +31,7 @@
#include <endian.h>
#include <byteswap.h>
#include "../pcm_local.h"
#endif
#define SHIFT 11
#define BITS (1<<SHIFT)
@ -51,9 +56,9 @@ struct rate_private_data {
ssize_t old_src_size, old_dst_size;
};
static void mix16_expand(struct rate_private_data *data, int voices,
signed short *src_ptr, int src_size,
signed short *dst_ptr, int dst_size)
static void resample16_expand(struct rate_private_data *data, int voices,
signed short *src_ptr, int src_size,
signed short *dst_ptr, int dst_size)
{
unsigned int pos;
signed int val;
@ -97,9 +102,9 @@ static void mix16_expand(struct rate_private_data *data, int voices,
}
}
static void mix16_shrink(struct rate_private_data *data, int voices,
signed short *src_ptr, int src_size,
signed short *dst_ptr, int dst_size)
static void resample16_shrink(struct rate_private_data *data, int voices,
signed short *src_ptr, int src_size,
signed short *dst_ptr, int dst_size)
{
unsigned int pos;
signed int val;
@ -140,9 +145,9 @@ static void mix16_shrink(struct rate_private_data *data, int voices,
}
}
static void mix8_expand(struct rate_private_data *data, int voices,
unsigned char *src_ptr, int src_size,
unsigned char *dst_ptr, int dst_size)
static void resample8_expand(struct rate_private_data *data, int voices,
unsigned char *src_ptr, int src_size,
unsigned char *dst_ptr, int dst_size)
{
unsigned int pos;
signed int val;
@ -186,9 +191,9 @@ static void mix8_expand(struct rate_private_data *data, int voices,
}
}
static void mix8_shrink(struct rate_private_data *data, int voices,
unsigned char *src_ptr, int src_size,
unsigned char *dst_ptr, int dst_size)
static void resample8_shrink(struct rate_private_data *data, int voices,
unsigned char *src_ptr, int src_size,
unsigned char *dst_ptr, int dst_size)
{
unsigned int pos;
signed int val;
@ -245,21 +250,21 @@ static ssize_t rate_transfer(snd_pcm_plugin_t *plugin,
return -EINVAL;
if (data->sample_size == 2) {
if (data->src_rate < data->dst_rate) {
mix16_expand(data, data->src_voices,
resample16_expand(data, data->src_voices,
(signed short *)src_ptr, src_size / (data->src_voices * 2),
(signed short *)dst_ptr, dst_size / (data->dst_voices * 2));
} else {
mix16_shrink(data, data->src_voices,
resample16_shrink(data, data->src_voices,
(signed short *)src_ptr, src_size / (data->src_voices * 2),
(signed short *)dst_ptr, dst_size / (data->dst_voices * 2));
}
} else {
if (data->src_rate < data->dst_rate) {
mix8_expand(data, data->src_voices,
resample8_expand(data, data->src_voices,
src_ptr, src_size / data->src_voices,
dst_ptr, dst_size / data->dst_voices);
} else {
mix8_shrink(data, data->src_voices,
resample8_shrink(data, data->src_voices,
src_ptr, src_size / data->src_voices,
dst_ptr, dst_size / data->dst_voices);
}
@ -365,7 +370,8 @@ int snd_pcm_plugin_build_rate(snd_pcm_format_t *src_format,
return -EINVAL;
*r_plugin = NULL;
if (src_format->interleave != dst_format->interleave)
if (src_format->interleave != dst_format->interleave &&
src_format->voices > 1)
return -EINVAL;
if (src_format->format != dst_format->format)
return -EINVAL;
@ -410,3 +416,7 @@ int snd_pcm_plugin_build_rate(snd_pcm_format_t *src_format,
*r_plugin = plugin;
return 0;
}
#ifdef __KERNEL__
EXPORT_SYMBOL(snd_pcm_plugin_build_rate);
#endif