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Document audio/utils.c

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twinaphex 2015-01-09 01:43:57 +01:00
parent 97f0d94c30
commit 6abd887fc8
2 changed files with 225 additions and 0 deletions
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123
audio/utils.c
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@ -25,6 +25,18 @@
#include <altivec.h>
#endif
/**
* audio_convert_s16_to_float_C:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
* @gain : gain applied to the audio volume
*
* Converts audio samples from signed integer 16-bit
* to floating point.
*
* C implementation callback function.
**/
void audio_convert_s16_to_float_C(float *out,
const int16_t *in, size_t samples, float gain)
{
@ -34,6 +46,17 @@ void audio_convert_s16_to_float_C(float *out,
out[i] = (float)in[i] * gain;
}
/**
* audio_convert_float_to_s16_C:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
*
* Converts audio samples from floating point
* to signed integer 16-bit.
*
* C implementation callback function.
**/
void audio_convert_float_to_s16_C(int16_t *out,
const float *in, size_t samples)
{
@ -47,12 +70,25 @@ void audio_convert_float_to_s16_C(int16_t *out,
}
#if defined(__SSE2__)
/**
* audio_convert_s16_to_float_SSE2:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
* @gain : gain applied to the audio volume
*
* Converts audio samples from signed integer 16-bit
* to floating point.
*
* SSE2 implementation callback function.
**/
void audio_convert_s16_to_float_SSE2(float *out,
const int16_t *in, size_t samples, float gain)
{
float fgain = gain / UINT32_C(0x80000000);
__m128 factor = _mm_set1_ps(fgain);
size_t i;
for (i = 0; i + 8 <= samples; i += 8, in += 8, out += 8)
{
__m128i input = _mm_loadu_si128((const __m128i *)in);
@ -73,6 +109,17 @@ void audio_convert_s16_to_float_SSE2(float *out,
audio_convert_s16_to_float_C(out, in, samples - i, gain);
}
/**
* audio_convert_float_to_s16_SSE2:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
*
* Converts audio samples from floating point
* to signed integer 16-bit.
*
* SSE2 implementation callback function.
**/
void audio_convert_float_to_s16_SSE2(int16_t *out,
const float *in, size_t samples)
{
@ -93,6 +140,18 @@ void audio_convert_float_to_s16_SSE2(int16_t *out,
audio_convert_float_to_s16_C(out, in, samples - i);
}
#elif defined(__ALTIVEC__)
/**
* audio_convert_s16_to_float_altivec:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
* @gain : gain applied to the audio volume
*
* Converts audio samples from signed integer 16-bit
* to floating point.
*
* AltiVec implementation callback function.
**/
void audio_convert_s16_to_float_altivec(float *out,
const int16_t *in, size_t samples, float gain)
{
@ -122,6 +181,17 @@ void audio_convert_s16_to_float_altivec(float *out,
audio_convert_s16_to_float_C(out, in, samples_in, gain);
}
/**
* audio_convert_float_to_s16_altivec:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
*
* Converts audio samples from floating point
* to signed integer 16-bit.
*
* AltiVec implementation callback function.
**/
void audio_convert_float_to_s16_altivec(int16_t *out,
const float *in, size_t samples)
{
@ -150,6 +220,18 @@ void audio_convert_float_to_s16_altivec(int16_t *out,
void audio_convert_s16_float_asm(float *out, const int16_t *in,
size_t samples, const float *gain);
/**
* audio_convert_s16_to_float_neon:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
* @gain : gain applied to the audio volume
*
* Converts audio samples from signed integer 16-bit
* to floating point.
*
* ARM NEON implementation callback function.
**/
static void audio_convert_s16_to_float_neon(float *out,
const int16_t *in, size_t samples, float gain)
{
@ -164,6 +246,17 @@ static void audio_convert_s16_to_float_neon(float *out,
void audio_convert_float_s16_asm(int16_t *out, const float *in, size_t samples);
/**
* audio_convert_float_to_s16_neon:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
*
* Converts audio samples from floating point
* to signed integer 16-bit.
*
* ARM NEON implementation callback function.
**/
static void audio_convert_float_to_s16_neon(int16_t *out,
const float *in, size_t samples)
{
@ -175,6 +268,19 @@ static void audio_convert_float_to_s16_neon(int16_t *out,
samples - aligned_samples);
}
#elif defined(_MIPS_ARCH_ALLEGREX)
/**
* audio_convert_s16_to_float_ALLEGREX:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
* @gain : gain applied to the audio volume
*
* Converts audio samples from signed integer 16-bit
* to floating point.
*
* MIPS ALLEGREX implementation callback function.
**/
void audio_convert_s16_to_float_ALLEGREX(float *out,
const int16_t *in, size_t samples, float gain)
{
@ -234,6 +340,17 @@ void audio_convert_s16_to_float_ALLEGREX(float *out,
out[i] = (float)in[i] * gain;
}
/**
* audio_convert_float_to_s16_ALLEGREX:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
*
* Converts audio samples from floating point
* to signed integer 16-bit.
*
* MIPS ALLEGREX implementation callback function.
**/
void audio_convert_float_to_s16_ALLEGREX(int16_t *out,
const float *in, size_t samples)
{
@ -275,6 +392,12 @@ void audio_convert_float_to_s16_ALLEGREX(int16_t *out,
}
#endif
/**
* audio_convert_init_simd:
*
* Sets up function pointers for audio conversion
* functions based on CPU features.
**/
void audio_convert_init_simd(void)
{
#if defined(__ARM_NEON__)

102
audio/utils.h
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@ -31,9 +31,32 @@ extern "C" {
#define audio_convert_s16_to_float audio_convert_s16_to_float_SSE2
#define audio_convert_float_to_s16 audio_convert_float_to_s16_SSE2
/**
* audio_convert_s16_to_float_SSE2:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
* @gain : gain applied to the audio volume
*
* Converts audio samples from signed integer 16-bit
* to floating point.
*
* SSE2 implementation callback function.
**/
void audio_convert_s16_to_float_SSE2(float *out,
const int16_t *in, size_t samples, float gain);
/**
* audio_convert_float_to_s16_SSE2:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
*
* Converts audio samples from floating point
* to signed integer 16-bit.
*
* SSE2 implementation callback function.
**/
void audio_convert_float_to_s16_SSE2(int16_t *out,
const float *in, size_t samples);
@ -41,9 +64,32 @@ void audio_convert_float_to_s16_SSE2(int16_t *out,
#define audio_convert_s16_to_float audio_convert_s16_to_float_altivec
#define audio_convert_float_to_s16 audio_convert_float_to_s16_altivec
/**
* audio_convert_s16_to_float_altivec:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
* @gain : gain applied to the audio volume
*
* Converts audio samples from signed integer 16-bit
* to floating point.
*
* AltiVec implementation callback function.
**/
void audio_convert_s16_to_float_altivec(float *out,
const int16_t *in, size_t samples, float gain);
/**
* audio_convert_float_to_s16_altivec:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
*
* Converts audio samples from floating point
* to signed integer 16-bit.
*
* AltiVec implementation callback function.
**/
void audio_convert_float_to_s16_altivec(int16_t *out,
const float *in, size_t samples);
@ -53,14 +99,40 @@ void audio_convert_float_to_s16_altivec(int16_t *out,
void (*audio_convert_s16_to_float_arm)(float *out,
const int16_t *in, size_t samples, float gain);
void (*audio_convert_float_to_s16_arm)(int16_t *out,
const float *in, size_t samples);
#elif defined(_MIPS_ARCH_ALLEGREX)
#define audio_convert_s16_to_float audio_convert_s16_to_float_ALLEGREX
#define audio_convert_float_to_s16 audio_convert_float_to_s16_ALLEGREX
/**
* audio_convert_s16_to_float_ALLEGREX:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
* @gain : gain applied to the audio volume
*
* Converts audio samples from signed integer 16-bit
* to floating point.
*
* MIPS ALLEGREX implementation callback function.
**/
void audio_convert_s16_to_float_ALLEGREX(float *out,
const int16_t *in, size_t samples, float gain);
/**
* audio_convert_float_to_s16_ALLEGREX:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
*
* Converts audio samples from floating point
* to signed integer 16-bit.
*
* MIPS ALLEGREX implementation callback function.
**/
void audio_convert_float_to_s16_ALLEGREX(int16_t *out,
const float *in, size_t samples);
#else
@ -68,11 +140,41 @@ void audio_convert_float_to_s16_ALLEGREX(int16_t *out,
#define audio_convert_float_to_s16 audio_convert_float_to_s16_C
#endif
/**
* audio_convert_s16_to_float_C:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
* @gain : gain applied to the audio volume
*
* Converts audio samples from signed integer 16-bit
* to floating point.
*
* C implementation callback function.
**/
void audio_convert_s16_to_float_C(float *out,
const int16_t *in, size_t samples, float gain);
/**
* audio_convert_float_to_s16_C:
* @out : output buffer
* @in : input buffer
* @samples : size of samples to be converted
*
* Converts audio samples from floating point
* to signed integer 16-bit.
*
* C implementation callback function.
**/
void audio_convert_float_to_s16_C(int16_t *out,
const float *in, size_t samples);
/**
* audio_convert_init_simd:
*
* Sets up function pointers for audio conversion
* functions based on CPU features.
**/
void audio_convert_init_simd(void);
#ifdef __cplusplus