mirror of
https://github.com/alsa-project/alsa-lib.git
synced 2025-11-01 22:58:49 -04:00
Abramo Bagnara <abbagnara@racine.ra.it>
Sun, 05 Dec 1999 19:02:01 +0100 Bug fixed: - duplicated deallocation for mmap'ed area - missing deallocation in es18xx - some bugs in volbal conversion New features: - virtual mixer for card-share (it seems to work, but I feel that it need further testing) Misc: - reorganization and extension of rate.c Jaroslav changes: - volbal source is mostly reverted back (no card-share mixer polling)
This commit is contained in:
Jaroslav Kysela
parent
863412f63e
commit
6aabe84a5e
3 changed files with 103 additions and 155 deletions
|
|
@ -31,6 +31,7 @@
|
|||
#define SHIFT 11
|
||||
#define BITS (1<<SHIFT)
|
||||
#define MASK (BITS-1)
|
||||
#define MAX_VOICES 6
|
||||
|
||||
/*
|
||||
* Basic rate conversion plugin
|
||||
|
|
@ -43,98 +44,51 @@ struct rate_private_data {
|
|||
int dst_rate;
|
||||
unsigned int pitch;
|
||||
unsigned int pos;
|
||||
signed short last_L_S1, last_R_S1;
|
||||
signed short last_L_S2, last_R_S2;
|
||||
signed short last_S1[MAX_VOICES];
|
||||
signed short last_S2[MAX_VOICES];
|
||||
ssize_t old_src_size, old_dst_size;
|
||||
};
|
||||
|
||||
static void mix_mono(struct rate_private_data *data,
|
||||
signed short *src_ptr, int src_size,
|
||||
signed short *dst_ptr, int dst_size)
|
||||
{
|
||||
unsigned int pos;
|
||||
signed int val;
|
||||
signed int L_S1, L_S2;
|
||||
|
||||
pos = data->pos;
|
||||
L_S1 = data->last_L_S1;
|
||||
L_S2 = data->last_L_S2;
|
||||
if (pos >> SHIFT) {
|
||||
src_ptr += ((pos >> SHIFT) - 1); pos &= MASK;
|
||||
L_S1 = L_S2;
|
||||
L_S2 = *src_ptr;
|
||||
}
|
||||
while (dst_size-- > 0) {
|
||||
if (pos >> SHIFT) {
|
||||
src_ptr += (pos >> SHIFT); pos &= MASK;
|
||||
L_S1 = L_S2;
|
||||
L_S2 = *src_ptr;
|
||||
}
|
||||
|
||||
val = L_S1 + ((L_S2 - L_S1) * (signed int)pos) / BITS;
|
||||
if (val < -32768)
|
||||
val = -32768;
|
||||
else if (val > 32767)
|
||||
val = 32767;
|
||||
*dst_ptr++ = val;
|
||||
|
||||
pos += data->pitch;
|
||||
}
|
||||
data->last_L_S1 = L_S1;
|
||||
data->last_L_S2 = L_S2;
|
||||
data->pos = pos;
|
||||
}
|
||||
|
||||
static void mix_stereo(struct rate_private_data *data,
|
||||
signed short *src_ptr, int src_size,
|
||||
signed short *dst_ptr, int dst_size)
|
||||
static void mix(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;
|
||||
signed int L_S1, R_S1, L_S2, R_S2;
|
||||
signed short *S1, *S2;
|
||||
int voice;
|
||||
|
||||
pos = data->pos;
|
||||
L_S1 = data->last_L_S1;
|
||||
R_S1 = data->last_R_S1;
|
||||
L_S2 = data->last_L_S2;
|
||||
R_S2 = data->last_R_S2;
|
||||
S1 = data->last_S1;
|
||||
S2 = data->last_S2;
|
||||
if (pos >> SHIFT) {
|
||||
src_ptr += ((pos >> SHIFT) - 1) * 2; pos &= MASK;
|
||||
L_S1 = L_S2;
|
||||
R_S1 = R_S2;
|
||||
L_S2 = *src_ptr;
|
||||
R_S2 = *(src_ptr + 1);
|
||||
src_ptr += ((pos >> SHIFT) - 1) * voices; pos &= MASK;
|
||||
for (voice = 0; voice < voices; ++voice) {
|
||||
S1[voice] = S2[voice];
|
||||
S2[voice] = src_ptr[voice];
|
||||
}
|
||||
}
|
||||
while (dst_size-- > 0) {
|
||||
if (pos >> SHIFT) {
|
||||
src_ptr += (pos >> SHIFT) * 2; pos &= MASK;
|
||||
L_S1 = L_S2;
|
||||
R_S1 = R_S2;
|
||||
L_S2 = *src_ptr;
|
||||
R_S2 = *(src_ptr + 1);
|
||||
src_ptr += (pos >> SHIFT) * voices; pos &= MASK;
|
||||
for (voice = 0; voice < voices; ++voice) {
|
||||
S1[voice] = S2[voice];
|
||||
S2[voice] = src_ptr[voice];
|
||||
}
|
||||
}
|
||||
|
||||
val = L_S1 + ((L_S2 - L_S1) * (signed int)pos) / BITS;
|
||||
if (val < -32768)
|
||||
val = -32768;
|
||||
else if (val > 32767)
|
||||
val = 32767;
|
||||
*dst_ptr++ = val;
|
||||
// printf("L_S1 = %i, L_S2 = %i, pos = %i, val = %i\n", L_S1, L_S2, pos, val);
|
||||
|
||||
val = R_S1 + ((R_S2 - R_S1) * (signed int)pos) / BITS;
|
||||
if (val < -32768)
|
||||
val = -32768;
|
||||
else if (val > 32767)
|
||||
val = 32767;
|
||||
*dst_ptr++ = val;
|
||||
for (voice = 0; voice < voices; ++voice) {
|
||||
val = S1[voice] + ((S2[voice] - S1[voice]) * (signed int)pos) / BITS;
|
||||
if (val < -32768)
|
||||
val = -32768;
|
||||
else if (val > 32767)
|
||||
val = 32767;
|
||||
*dst_ptr++ = val;
|
||||
}
|
||||
|
||||
pos += data->pitch;
|
||||
}
|
||||
data->last_L_S1 = L_S1;
|
||||
data->last_R_S1 = R_S1;
|
||||
data->last_L_S2 = L_S2;
|
||||
data->last_R_S2 = R_S2;
|
||||
data->pos = pos;
|
||||
}
|
||||
|
||||
|
|
@ -152,23 +106,16 @@ static ssize_t rate_transfer(snd_pcm_plugin_t *plugin,
|
|||
data = (struct rate_private_data *)snd_pcm_plugin_extra_data(plugin);
|
||||
if (data == NULL)
|
||||
return -EINVAL;
|
||||
if (data->src_voices == 1) {
|
||||
mix_mono(data, (signed short *)src_ptr, src_size / 2,
|
||||
(signed short *)dst_ptr, dst_size / 2);
|
||||
return (dst_size / 2) * 2;
|
||||
}
|
||||
else if (data->src_voices == 2) {
|
||||
mix_stereo(data, (signed short *)src_ptr, src_size / 4,
|
||||
(signed short *)dst_ptr, dst_size / 4);
|
||||
return (dst_size / 4) * 4;
|
||||
} else {
|
||||
return -EINVAL;
|
||||
}
|
||||
mix(data, data->src_voices,
|
||||
(signed short *)src_ptr, src_size / (data->src_voices * 2),
|
||||
(signed short *)dst_ptr, dst_size / (data->dst_voices * 2));
|
||||
return dst_size / (2 * data->src_voices) * (2 * data->src_voices);
|
||||
}
|
||||
|
||||
static int rate_action(snd_pcm_plugin_t *plugin, snd_pcm_plugin_action_t action)
|
||||
{
|
||||
struct rate_private_data *data;
|
||||
int voice;
|
||||
|
||||
if (plugin == NULL)
|
||||
return -EINVAL;
|
||||
|
|
@ -179,8 +126,9 @@ static int rate_action(snd_pcm_plugin_t *plugin, snd_pcm_plugin_action_t action)
|
|||
case DRAIN:
|
||||
case FLUSH:
|
||||
data->pos = 0;
|
||||
data->last_L_S1 = data->last_R_S1 = 0;
|
||||
data->last_L_S2 = data->last_R_S2 = 0;
|
||||
for (voice = 0; voice < data->src_voices; ++voice) {
|
||||
data->last_S1[voice] = data->last_S2[voice] = 0;
|
||||
}
|
||||
break;
|
||||
}
|
||||
return 0; /* silenty ignore other actions */
|
||||
|
|
@ -215,7 +163,7 @@ static ssize_t rate_dst_size(snd_pcm_plugin_t *plugin, size_t size)
|
|||
return -EINVAL;
|
||||
data = (struct rate_private_data *)snd_pcm_plugin_extra_data(plugin);
|
||||
res = (((size << SHIFT) + (data->pitch / 2)) / data->pitch);
|
||||
res = res / (data->src_voices*2) * (data->src_voices*2);
|
||||
res = res / (data->dst_voices*2) * (data->dst_voices*2);
|
||||
/* Why this? */
|
||||
if (size < 128*1024) {
|
||||
if (data->old_dst_size == size)
|
||||
|
|
@ -232,6 +180,7 @@ int snd_pcm_plugin_build_rate(snd_pcm_format_t *src_format,
|
|||
{
|
||||
struct rate_private_data *data;
|
||||
snd_pcm_plugin_t *plugin;
|
||||
int voice;
|
||||
|
||||
if (!r_plugin)
|
||||
return -EINVAL;
|
||||
|
|
@ -245,7 +194,7 @@ int snd_pcm_plugin_build_rate(snd_pcm_format_t *src_format,
|
|||
return -EINVAL;
|
||||
if (src_format->voices != dst_format->voices)
|
||||
return -EINVAL;
|
||||
if (dst_format->voices != 1 && dst_format->voices != 2)
|
||||
if (dst_format->voices < 1 || dst_format->voices > MAX_VOICES)
|
||||
return -EINVAL;
|
||||
|
||||
if (src_format->format != SND_PCM_SFMT_S16_LE ||
|
||||
|
|
@ -264,8 +213,9 @@ int snd_pcm_plugin_build_rate(snd_pcm_format_t *src_format,
|
|||
data->dst_rate = dst_format->rate;
|
||||
data->pitch = ((src_format->rate << SHIFT) + (dst_format->rate >> 1)) / dst_format->rate;
|
||||
data->pos = 0;
|
||||
data->last_L_S1 = data->last_R_S1 = 0;
|
||||
data->last_L_S2 = data->last_R_S2 = 0;
|
||||
for (voice = 0; voice < data->src_voices; ++voice) {
|
||||
data->last_S1[voice] = data->last_S2[voice] = 0;
|
||||
}
|
||||
data->old_src_size = data->old_dst_size = 0;
|
||||
plugin->transfer = rate_transfer;
|
||||
plugin->src_size = rate_src_size;
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue