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-rw-r--r--src/xine-engine/resample.c115
1 files changed, 74 insertions, 41 deletions
diff --git a/src/xine-engine/resample.c b/src/xine-engine/resample.c
index a7b16917c..1bc9dfaf9 100644
--- a/src/xine-engine/resample.c
+++ b/src/xine-engine/resample.c
@@ -24,26 +24,34 @@
#include "config.h"
#endif
+#include <string.h>
#include <inttypes.h>
#include "attributes.h"
#include "resample.h"
/* contributed by paul flinders */
-void _x_audio_out_resample_mono(int16_t* input_samples, uint32_t in_samples,
+void _x_audio_out_resample_mono(int16_t *last_sample,
+ int16_t* input_samples, uint32_t in_samples,
int16_t* output_samples, uint32_t out_samples)
{
unsigned int osample;
/* 16+16 fixed point math */
- uint32_t isample = 0;
- uint32_t istep = ((in_samples-2) << 16)/(out_samples-2);
+ uint32_t isample = 0xFFFF0000U;
+ uint32_t istep = (in_samples << 16) / out_samples + 1;
#ifdef VERBOSE
printf ("Audio : resample %d samples to %d\n",
in_samples, out_samples);
#endif
- for (osample = 0; osample < out_samples - 1; osample++) {
+ for (osample = 0; osample < out_samples && isample >= 0xFFFF0000U; osample++) {
+ uint32_t t = isample&0xffff;
+ output_samples[osample] = (last_sample[0] * (0x10000-t) + input_samples[0] * t) >> 16;
+ isample += istep;
+ }
+
+ for (; osample < out_samples; osample++) {
int s1;
int s2;
int16_t os;
@@ -58,23 +66,31 @@ void _x_audio_out_resample_mono(int16_t* input_samples, uint32_t in_samples,
isample += istep;
}
- output_samples[out_samples-1] = input_samples[in_samples-1];
+ last_sample[0] = input_samples[in_samples - 1];
}
-void _x_audio_out_resample_stereo(int16_t* input_samples, uint32_t in_samples,
+void _x_audio_out_resample_stereo(int16_t *last_sample,
+ int16_t* input_samples, uint32_t in_samples,
int16_t* output_samples, uint32_t out_samples)
{
unsigned int osample;
/* 16+16 fixed point math */
- uint32_t isample = 0;
- uint32_t istep = ((in_samples-2) << 16)/(out_samples-2);
+ uint32_t isample = 0xFFFF0000U;
+ uint32_t istep = (in_samples << 16) / out_samples + 1;
#ifdef VERBOSE
printf ("Audio : resample %d samples to %d\n",
in_samples, out_samples);
#endif
- for (osample = 0; osample < out_samples - 1; osample++) {
+ for (osample = 0; osample < out_samples && isample >= 0xFFFF0000U; osample++) {
+ uint32_t t = isample&0xffff;
+ output_samples[osample*2 ] = (last_sample[0] * (0x10000-t) + input_samples[0] * t) >> 16;
+ output_samples[osample*2+1] = (last_sample[1] * (0x10000-t) + input_samples[1] * t) >> 16;
+ isample += istep;
+ }
+
+ for (; osample < out_samples; osample++) {
int s1;
int s2;
int16_t os;
@@ -94,25 +110,34 @@ void _x_audio_out_resample_stereo(int16_t* input_samples, uint32_t in_samples,
output_samples[(osample * 2 )+1] = os;
isample += istep;
}
- output_samples[out_samples*2-2] = input_samples[in_samples*2-2];
- output_samples[out_samples*2-1] = input_samples[in_samples*2-1];
+ memcpy (last_sample, &input_samples[in_samples*2-2], 2 * sizeof (last_sample[0]));
}
-void _x_audio_out_resample_4channel(int16_t* input_samples, uint32_t in_samples,
+void _x_audio_out_resample_4channel(int16_t *last_sample,
+ int16_t* input_samples, uint32_t in_samples,
int16_t* output_samples, uint32_t out_samples)
{
unsigned int osample;
/* 16+16 fixed point math */
- uint32_t isample = 0;
- uint32_t istep = ((in_samples-2) << 16)/(out_samples-2);
+ uint32_t isample = 0xFFFF0000U;
+ uint32_t istep = (in_samples << 16) / out_samples + 1;
#ifdef VERBOSE
printf ("Audio : resample %d samples to %d\n",
in_samples, out_samples);
#endif
- for (osample = 0; osample < out_samples - 1; osample++) {
+ for (osample = 0; osample < out_samples && isample >= 0xFFFF0000U; osample++) {
+ uint32_t t = isample&0xffff;
+ output_samples[osample*4 ] = (last_sample[0] * (0x10000-t) + input_samples[0] * t) >> 16;
+ output_samples[osample*4+1] = (last_sample[1] * (0x10000-t) + input_samples[1] * t) >> 16;
+ output_samples[osample*4+2] = (last_sample[2] * (0x10000-t) + input_samples[2] * t) >> 16;
+ output_samples[osample*4+3] = (last_sample[3] * (0x10000-t) + input_samples[3] * t) >> 16;
+ isample += istep;
+ }
+
+ for (; osample < out_samples; osample++) {
int s1;
int s2;
int16_t os;
@@ -145,28 +170,35 @@ void _x_audio_out_resample_4channel(int16_t* input_samples, uint32_t in_samples,
isample += istep;
}
- output_samples[out_samples*4-4] = input_samples[in_samples*4-4];
- output_samples[out_samples*4-3] = input_samples[in_samples*4-3];
- output_samples[out_samples*4-2] = input_samples[in_samples*4-2];
- output_samples[out_samples*4-1] = input_samples[in_samples*4-1];
-
+ memcpy (last_sample, &input_samples[in_samples*4-4], 4 * sizeof (last_sample[0]));
}
-void _x_audio_out_resample_5channel(int16_t* input_samples, uint32_t in_samples,
+void _x_audio_out_resample_5channel(int16_t *last_sample,
+ int16_t* input_samples, uint32_t in_samples,
int16_t* output_samples, uint32_t out_samples)
{
unsigned int osample;
/* 16+16 fixed point math */
- uint32_t isample = 0;
- uint32_t istep = ((in_samples-2) << 16)/(out_samples-2);
+ uint32_t isample = 0xFFFF0000U;
+ uint32_t istep = (in_samples << 16) / out_samples + 1;
#ifdef VERBOSE
printf ("Audio : resample %d samples to %d\n",
in_samples, out_samples);
#endif
- for (osample = 0; osample < out_samples - 1; osample++) {
+ for (osample = 0; osample < out_samples && isample >= 0xFFFF0000U; osample++) {
+ uint32_t t = isample&0xffff;
+ output_samples[osample*5 ] = (last_sample[0] * (0x10000-t) + input_samples[0] * t) >> 16;
+ output_samples[osample*5+1] = (last_sample[1] * (0x10000-t) + input_samples[1] * t) >> 16;
+ output_samples[osample*5+2] = (last_sample[2] * (0x10000-t) + input_samples[2] * t) >> 16;
+ output_samples[osample*5+3] = (last_sample[3] * (0x10000-t) + input_samples[3] * t) >> 16;
+ output_samples[osample*5+4] = (last_sample[4] * (0x10000-t) + input_samples[4] * t) >> 16;
+ isample += istep;
+ }
+
+ for (; osample < out_samples; osample++) {
int s1;
int s2;
int16_t os;
@@ -205,29 +237,36 @@ void _x_audio_out_resample_5channel(int16_t* input_samples, uint32_t in_samples,
isample += istep;
}
-
- output_samples[out_samples*5-5] = input_samples[in_samples*5-5];
- output_samples[out_samples*5-4] = input_samples[in_samples*5-4];
- output_samples[out_samples*5-3] = input_samples[in_samples*5-3];
- output_samples[out_samples*5-2] = input_samples[in_samples*5-2];
- output_samples[out_samples*5-1] = input_samples[in_samples*5-1];
+ memcpy (last_sample, &input_samples[in_samples*5-5], 5 * sizeof (last_sample[0]));
}
-void _x_audio_out_resample_6channel(int16_t* input_samples, uint32_t in_samples,
+void _x_audio_out_resample_6channel(int16_t *last_sample,
+ int16_t* input_samples, uint32_t in_samples,
int16_t* output_samples, uint32_t out_samples)
{
unsigned int osample;
/* 16+16 fixed point math */
- uint32_t isample = 0;
- uint32_t istep = ((in_samples-2) << 16)/(out_samples-2);
+ uint32_t isample = 0xFFFF0000U;
+ uint32_t istep = (in_samples << 16) / out_samples + 1;
#ifdef VERBOSE
printf ("Audio : resample %d samples to %d\n",
in_samples, out_samples);
#endif
- for (osample = 0; osample < out_samples - 1; osample++) {
+ for (osample = 0; osample < out_samples && isample >= 0xFFFF0000U; osample++) {
+ uint32_t t = isample&0xffff;
+ output_samples[osample*6 ] = (last_sample[0] * (0x10000-t) + input_samples[0] * t) >> 16;
+ output_samples[osample*6+1] = (last_sample[1] * (0x10000-t) + input_samples[1] * t) >> 16;
+ output_samples[osample*6+2] = (last_sample[2] * (0x10000-t) + input_samples[2] * t) >> 16;
+ output_samples[osample*6+3] = (last_sample[3] * (0x10000-t) + input_samples[3] * t) >> 16;
+ output_samples[osample*6+4] = (last_sample[4] * (0x10000-t) + input_samples[4] * t) >> 16;
+ output_samples[osample*6+5] = (last_sample[5] * (0x10000-t) + input_samples[5] * t) >> 16;
+ isample += istep;
+ }
+
+ for (; osample < out_samples; osample++) {
int s1;
int s2;
int16_t os;
@@ -272,13 +311,7 @@ void _x_audio_out_resample_6channel(int16_t* input_samples, uint32_t in_samples,
isample += istep;
}
-
- output_samples[out_samples*6-6] = input_samples[in_samples*6-6];
- output_samples[out_samples*6-5] = input_samples[in_samples*6-5];
- output_samples[out_samples*6-4] = input_samples[in_samples*6-4];
- output_samples[out_samples*6-3] = input_samples[in_samples*6-3];
- output_samples[out_samples*6-2] = input_samples[in_samples*6-2];
- output_samples[out_samples*6-1] = input_samples[in_samples*6-1];
+ memcpy (last_sample, &input_samples[in_samples*6-6], 6 * sizeof (last_sample[0]));
}
void _x_audio_out_resample_8to16(int8_t* input_samples,
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-26 06:20:57 +0000