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Added proper initialization for expand, added corrections for sw_params (checks for period_size and buffer_size)

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This commit is contained in:
Jaroslav Kysela 2002-03-11 14:59:11 +00:00
parent c31a3bff06
commit 22bd1c328a
1 changed files with 48 additions and 13 deletions
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61
src/pcm/pcm_rate.c
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@ -41,6 +41,7 @@ const char *_snd_module_pcm_rate = "";
#define DIV (1<<16)
typedef struct {
int init;
int16_t sample;
int sum;
unsigned int pos;
@ -69,6 +70,22 @@ typedef struct {
snd_pcm_rate_state_t *states;
} snd_pcm_rate_t;
static int16_t initial_sample(const char *src, unsigned int getidx)
{
#define GET16_LABELS
#include "plugin_ops.h"
#undef GET16_LABELS
void *get = get16_labels[getidx];
int sample = 0;
goto *get;
#define GET16_END after_get
#include "plugin_ops.h"
#undef GET16_END
after_get:
return sample;
}
static snd_pcm_uframes_t snd_pcm_rate_expand(const snd_pcm_channel_area_t *dst_areas,
snd_pcm_uframes_t dst_offset, snd_pcm_uframes_t *dst_framesp,
const snd_pcm_channel_area_t *src_areas,
@ -108,6 +125,10 @@ static snd_pcm_uframes_t snd_pcm_rate_expand(const snd_pcm_channel_area_t *dst_a
dst_step = snd_pcm_channel_area_step(dst_area);
src_frames1 = 0;
dst_frames1 = 0;
if (states->init) {
old_sample = initial_sample(src, getidx);
states->init = 0;
}
while (dst_frames1 < dst_frames) {
if (pos >= get_threshold) {
int16_t new_sample;
@ -178,6 +199,7 @@ static snd_pcm_uframes_t snd_pcm_rate_shrink(const snd_pcm_channel_area_t *dst_a
int src_step, dst_step;
sum = states->sum;
pos = states->pos;
states->init = 0;
src = snd_pcm_channel_area_addr(src_area, src_offset);
dst = snd_pcm_channel_area_addr(dst_area, dst_offset);
src_step = snd_pcm_channel_area_step(src_area);
@ -382,23 +404,40 @@ static int snd_pcm_rate_hw_free(snd_pcm_t *pcm)
snd_pcm_rate_t *rate = pcm->private_data;
if (rate->states) {
free(rate->states);
rate->states = 0;
rate->states = NULL;
}
return snd_pcm_hw_free(rate->plug.slave);
}
static void recalc(snd_pcm_t *pcm, snd_pcm_uframes_t *val)
{
snd_pcm_rate_t *rate = pcm->private_data;
snd_pcm_t *slave = rate->plug.slave;
unsigned long div;
if (*val == pcm->buffer_size) {
*val = slave->buffer_size;
} else {
div = *val / pcm->period_size;
if (div * pcm->period_size == *val)
*val = div * slave->period_size;
else
*val = muldiv_near(*val, slave->rate, pcm->rate);
}
}
static int snd_pcm_rate_sw_params(snd_pcm_t *pcm, snd_pcm_sw_params_t * params)
{
snd_pcm_rate_t *rate = pcm->private_data;
snd_pcm_t *slave = rate->plug.slave;
snd_pcm_sw_params_t sparams;
sparams = *params;
sparams.avail_min = muldiv_near(sparams.avail_min, slave->rate, pcm->rate);
sparams.xfer_align = muldiv_near(sparams.xfer_align, slave->rate, pcm->rate);
sparams.silence_threshold = muldiv_near(sparams.silence_threshold, slave->rate, pcm->rate);
sparams.silence_size = muldiv_near(sparams.silence_size, slave->rate, pcm->rate);
sparams.start_threshold = muldiv_near(sparams.start_threshold, slave->rate, pcm->rate);
sparams.stop_threshold = muldiv_near(sparams.stop_threshold, slave->rate, pcm->rate);
recalc(pcm, &sparams.avail_min);
recalc(pcm, &sparams.xfer_align);
recalc(pcm, &sparams.start_threshold);
recalc(pcm, &sparams.stop_threshold);
recalc(pcm, &sparams.silence_threshold);
recalc(pcm, &sparams.silence_size);
return snd_pcm_sw_params(slave, &sparams);
}
@ -409,12 +448,8 @@ static int snd_pcm_rate_init(snd_pcm_t *pcm)
for (k = 0; k < pcm->channels; ++k) {
rate->states[k].sum = 0;
rate->states[k].sample = 0;
if (rate->func == snd_pcm_rate_expand) {
/* Get a sample on entry */
rate->states[k].pos = rate->pitch;
} else {
rate->states[k].pos = 0;
}
rate->states[k].pos = 0;
rate->states[k].init = 0;
}
return 0;
}