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183
cocos2d-x/cocos/audio/android/audio_utils/format.c Normal file
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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* #define LOG_NDEBUG 0 */
#define LOG_TAG "audio_utils_format"
#include "audio/android/cutils/log.h"
#include "audio/android/audio_utils/include/audio_utils/primitives.h"
#include "audio/android/audio_utils/include/audio_utils/format.h"
#include "audio/android/audio.h"
void memcpy_by_audio_format(void *dst, audio_format_t dst_format,
const void *src, audio_format_t src_format, size_t count)
{
/* default cases for error falls through to fatal log below. */
if (dst_format == src_format) {
switch (dst_format) {
case AUDIO_FORMAT_PCM_16_BIT:
case AUDIO_FORMAT_PCM_FLOAT:
case AUDIO_FORMAT_PCM_8_BIT:
case AUDIO_FORMAT_PCM_24_BIT_PACKED:
case AUDIO_FORMAT_PCM_32_BIT:
case AUDIO_FORMAT_PCM_8_24_BIT:
memcpy(dst, src, count * audio_bytes_per_sample(dst_format));
return;
default:
break;
}
}
switch (dst_format) {
case AUDIO_FORMAT_PCM_16_BIT:
switch (src_format) {
case AUDIO_FORMAT_PCM_FLOAT:
memcpy_to_i16_from_float((int16_t*)dst, (float*)src, count);
return;
case AUDIO_FORMAT_PCM_8_BIT:
memcpy_to_i16_from_u8((int16_t*)dst, (uint8_t*)src, count);
return;
case AUDIO_FORMAT_PCM_24_BIT_PACKED:
memcpy_to_i16_from_p24((int16_t*)dst, (uint8_t*)src, count);
return;
case AUDIO_FORMAT_PCM_32_BIT:
memcpy_to_i16_from_i32((int16_t*)dst, (int32_t*)src, count);
return;
case AUDIO_FORMAT_PCM_8_24_BIT:
memcpy_to_i16_from_q8_23((int16_t*)dst, (int32_t*)src, count);
return;
default:
break;
}
break;
case AUDIO_FORMAT_PCM_FLOAT:
switch (src_format) {
case AUDIO_FORMAT_PCM_16_BIT:
memcpy_to_float_from_i16((float*)dst, (int16_t*)src, count);
return;
case AUDIO_FORMAT_PCM_8_BIT:
memcpy_to_float_from_u8((float*)dst, (uint8_t*)src, count);
return;
case AUDIO_FORMAT_PCM_24_BIT_PACKED:
memcpy_to_float_from_p24((float*)dst, (uint8_t*)src, count);
return;
case AUDIO_FORMAT_PCM_32_BIT:
memcpy_to_float_from_i32((float*)dst, (int32_t*)src, count);
return;
case AUDIO_FORMAT_PCM_8_24_BIT:
memcpy_to_float_from_q8_23((float*)dst, (int32_t*)src, count);
return;
default:
break;
}
break;
case AUDIO_FORMAT_PCM_8_BIT:
switch (src_format) {
case AUDIO_FORMAT_PCM_16_BIT:
memcpy_to_u8_from_i16((uint8_t*)dst, (int16_t*)src, count);
return;
case AUDIO_FORMAT_PCM_FLOAT:
memcpy_to_u8_from_float((uint8_t*)dst, (float*)src, count);
return;
default:
break;
}
break;
case AUDIO_FORMAT_PCM_24_BIT_PACKED:
switch (src_format) {
case AUDIO_FORMAT_PCM_16_BIT:
memcpy_to_p24_from_i16((uint8_t*)dst, (int16_t*)src, count);
return;
case AUDIO_FORMAT_PCM_FLOAT:
memcpy_to_p24_from_float((uint8_t*)dst, (float*)src, count);
return;
default:
break;
}
break;
case AUDIO_FORMAT_PCM_32_BIT:
switch (src_format) {
case AUDIO_FORMAT_PCM_16_BIT:
memcpy_to_i32_from_i16((int32_t*)dst, (int16_t*)src, count);
return;
case AUDIO_FORMAT_PCM_FLOAT:
memcpy_to_i32_from_float((int32_t*)dst, (float*)src, count);
return;
default:
break;
}
break;
case AUDIO_FORMAT_PCM_8_24_BIT:
switch (src_format) {
case AUDIO_FORMAT_PCM_16_BIT:
memcpy_to_q8_23_from_i16((int32_t*)dst, (int16_t*)src, count);
return;
case AUDIO_FORMAT_PCM_FLOAT:
memcpy_to_q8_23_from_float_with_clamp((int32_t*)dst, (float*)src, count);
return;
case AUDIO_FORMAT_PCM_24_BIT_PACKED: {
memcpy_to_q8_23_from_p24((int32_t *)dst, (uint8_t *)src, count);
return;
}
default:
break;
}
break;
default:
break;
}
LOG_ALWAYS_FATAL("invalid src format %#x for dst format %#x",
src_format, dst_format);
}
size_t memcpy_by_index_array_initialization_from_channel_mask(int8_t *idxary, size_t arysize,
audio_channel_mask_t dst_channel_mask, audio_channel_mask_t src_channel_mask)
{
const audio_channel_representation_t src_representation =
audio_channel_mask_get_representation(src_channel_mask);
const audio_channel_representation_t dst_representation =
audio_channel_mask_get_representation(dst_channel_mask);
const uint32_t src_bits = audio_channel_mask_get_bits(src_channel_mask);
const uint32_t dst_bits = audio_channel_mask_get_bits(dst_channel_mask);
switch (src_representation) {
case AUDIO_CHANNEL_REPRESENTATION_POSITION:
switch (dst_representation) {
case AUDIO_CHANNEL_REPRESENTATION_POSITION:
return memcpy_by_index_array_initialization(idxary, arysize,
dst_bits, src_bits);
case AUDIO_CHANNEL_REPRESENTATION_INDEX:
return memcpy_by_index_array_initialization_dst_index(idxary, arysize,
dst_bits, src_bits);
default:
return 0;
}
break;
case AUDIO_CHANNEL_REPRESENTATION_INDEX:
switch (dst_representation) {
case AUDIO_CHANNEL_REPRESENTATION_POSITION:
return memcpy_by_index_array_initialization_src_index(idxary, arysize,
dst_bits, src_bits);
case AUDIO_CHANNEL_REPRESENTATION_INDEX:
return memcpy_by_index_array_initialization(idxary, arysize,
dst_bits, src_bits);
default:
return 0;
}
break;
default:
return 0;
}
}

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cocos2d-x/cocos/audio/android/audio_utils/include/audio_utils/format.h Normal file
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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef COCOS_AUDIO_FORMAT_H
#define COCOS_AUDIO_FORMAT_H
#include <stdint.h>
#include <sys/cdefs.h>
#include "audio/android/audio.h"
__BEGIN_DECLS
/* Copy buffers with conversion between buffer sample formats.
*
* dst Destination buffer
* dst_format Destination buffer format
* src Source buffer
* src_format Source buffer format
* count Number of samples to copy
*
* Allowed format conversions are given by either case 1 or 2 below:
*
* 1) One of src_format or dst_format is AUDIO_FORMAT_PCM_16_BIT or
* AUDIO_FORMAT_PCM_FLOAT, and the other format type is one of:
*
* AUDIO_FORMAT_PCM_16_BIT
* AUDIO_FORMAT_PCM_FLOAT
* AUDIO_FORMAT_PCM_8_BIT
* AUDIO_FORMAT_PCM_24_BIT_PACKED
* AUDIO_FORMAT_PCM_32_BIT
* AUDIO_FORMAT_PCM_8_24_BIT
*
* 2) Both dst_format and src_format are identical and of the list given
* in (1). This is a straight copy.
*
* The destination and source buffers must be completely separate if the destination
* format size is larger than the source format size. These routines call functions
* in primitives.h, so descriptions of detailed behavior can be reviewed there.
*
* Logs a fatal error if dst or src format is not allowed by the conversion rules above.
*/
void memcpy_by_audio_format(void *dst, audio_format_t dst_format,
const void *src, audio_format_t src_format, size_t count);
/* This function creates an index array for converting audio data with different
* channel position and index masks, used by memcpy_by_index_array().
* Returns the number of array elements required.
* This may be greater than idxcount, so the return value should be checked
* if idxary size is less than 32. Returns zero if the input masks are unrecognized.
*
* Note that idxary is a caller allocated array
* of at least as many channels as present in the dst_mask.
*
* Parameters:
* idxary Updated array of indices of channels in the src frame for the dst frame
* idxcount Number of caller allocated elements in idxary
* dst_mask Bit mask corresponding to destination channels present
* src_mask Bit mask corresponding to source channels present
*/
size_t memcpy_by_index_array_initialization_from_channel_mask(int8_t *idxary, size_t arysize,
audio_channel_mask_t dst_channel_mask, audio_channel_mask_t src_channel_mask);
__END_DECLS
#endif // COCOS_AUDIO_FORMAT_H

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cocos2d-x/cocos/audio/android/audio_utils/include/audio_utils/minifloat.h Normal file
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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef COCOS_AUDIO_MINIFLOAT_H
#define COCOS_AUDIO_MINIFLOAT_H
#include <stdint.h>
#include <sys/cdefs.h>
__BEGIN_DECLS
/* A single gain expressed as minifloat */
typedef uint16_t gain_minifloat_t;
/* A pair of gain_minifloat_t packed into a single word */
typedef uint32_t gain_minifloat_packed_t;
/* The nominal range of a gain, expressed as a float */
#define GAIN_FLOAT_ZERO 0.0f
#define GAIN_FLOAT_UNITY 1.0f
/* Unity gain expressed as a minifloat */
#define GAIN_MINIFLOAT_UNITY 0xE000
/* Pack a pair of gain_mini_float_t into a combined gain_minifloat_packed_t */
static inline gain_minifloat_packed_t gain_minifloat_pack(gain_minifloat_t left,
gain_minifloat_t right)
{
return (right << 16) | left;
}
/* Unpack a gain_minifloat_packed_t into the two gain_minifloat_t components */
static inline gain_minifloat_t gain_minifloat_unpack_left(gain_minifloat_packed_t packed)
{
return packed & 0xFFFF;
}
static inline gain_minifloat_t gain_minifloat_unpack_right(gain_minifloat_packed_t packed)
{
return packed >> 16;
}
/* A pair of unity gains expressed as a gain_minifloat_packed_t */
#define GAIN_MINIFLOAT_PACKED_UNITY gain_minifloat_pack(GAIN_MINIFLOAT_UNITY, GAIN_MINIFLOAT_UNITY)
/* Convert a float to the internal representation used for gains.
* The nominal range [0.0, 1.0], but the hard range is [0.0, 2.0).
* Negative and underflow values are converted to 0.0,
* and values larger than the hard maximum are truncated to the hard maximum.
*
* Minifloats are ordered, and standard comparisons may be used between them
* in the gain_minifloat_t representation.
*
* Details on internal representation of gains, based on mini-floats:
* The nominal maximum is 1.0 and the hard maximum is 1 ULP less than 2.0, or +6 dB.
* The minimum non-zero value is approximately 1.9e-6 or -114 dB.
* Negative numbers, infinity, and NaN are not supported.
* There are 13 significand bits specified, 1 implied hidden bit, 3 exponent bits,
* and no sign bit. Denormals are supported.
*/
gain_minifloat_t gain_from_float(float f);
/* Convert the internal representation used for gains to float */
float float_from_gain(gain_minifloat_t gain);
__END_DECLS
#endif // COCOS_AUDIO_MINIFLOAT_H

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cocos2d-x/cocos/audio/android/audio_utils/include/audio_utils/primitives.h Normal file
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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef COCOS_AUDIO_PRIMITIVES_H
#define COCOS_AUDIO_PRIMITIVES_H
#include <stdint.h>
#include <stdlib.h>
#include <sys/cdefs.h>
__BEGIN_DECLS
/* The memcpy_* conversion routines are designed to work in-place on same dst as
* src buffers only if the types shrink on copy, with the exception of
* memcpy_to_i16_from_u8(). This allows the loops to go upwards for faster cache
* access (and may be more flexible for future optimization later).
*/
/**
* Dither and clamp pairs of 32-bit input samples (sums) to 16-bit output
* samples (out). Each 32-bit input sample can be viewed as a signed fixed-point
* Q19.12 of which the .12 fraction bits are dithered and the 19 integer bits
* are clamped to signed 16 bits. Alternatively the input can be viewed as
* Q4.27, of which the lowest .12 of the fraction is dithered and the remaining
* fraction is converted to the output Q.15, with clamping on the 4 integer
* guard bits.
*
* For interleaved stereo, c is the number of sample pairs,
* and out is an array of interleaved pairs of 16-bit samples per channel.
* For mono, c is the number of samples / 2, and out is an array of 16-bit
* samples. The name "dither" is a misnomer; the current implementation does not
* actually dither but uses truncation. This may change. The out and sums
* buffers must either be completely separate (non-overlapping), or they must
* both start at the same address. Partially overlapping buffers are not
* supported.
*/
void ditherAndClamp(int32_t *out, const int32_t *sums, size_t c);
/* Expand and copy samples from unsigned 8-bit offset by 0x80 to signed 16-bit.
* Parameters:
* dst Destination buffer
* src Source buffer
* count Number of samples to copy
* The destination and source buffers must either be completely separate
* (non-overlapping), or they must both start at the same address. Partially
* overlapping buffers are not supported.
*/
void memcpy_to_i16_from_u8(int16_t *dst, const uint8_t *src, size_t count);
/* Shrink and copy samples from signed 16-bit to unsigned 8-bit offset by 0x80.
* Parameters:
* dst Destination buffer
* src Source buffer
* count Number of samples to copy
* The destination and source buffers must either be completely separate
* (non-overlapping), or they must both start at the same address. Partially
* overlapping buffers are not supported. The conversion is done by truncation,
* without dithering, so it loses resolution.
*/
void memcpy_to_u8_from_i16(uint8_t *dst, const int16_t *src, size_t count);
/* Copy samples from float to unsigned 8-bit offset by 0x80.
* Parameters:
* dst Destination buffer
* src Source buffer
* count Number of samples to copy
* The destination and source buffers must either be completely separate
* (non-overlapping), or they must both start at the same address. Partially
* overlapping buffers are not supported. The conversion is done by truncation,
* without dithering, so it loses resolution.
*/
void memcpy_to_u8_from_float(uint8_t *dst, const float *src, size_t count);
/* Shrink and copy samples from signed 32-bit fixed-point Q0.31 to signed 16-bit
* Q0.15. Parameters: dst Destination buffer src Source buffer count
* Number of samples to copy The destination and source buffers must either be
* completely separate (non-overlapping), or they must both start at the same
* address. Partially overlapping buffers are not supported. The conversion is
* done by truncation, without dithering, so it loses resolution.
*/
void memcpy_to_i16_from_i32(int16_t *dst, const int32_t *src, size_t count);
/* Shrink and copy samples from single-precision floating-point to signed
* 16-bit. Each float should be in the range -1.0 to 1.0. Values outside that
* range are clamped, refer to clamp16_from_float(). Parameters: dst Destination
* buffer src Source buffer count Number of samples to copy The
* destination and source buffers must either be completely separate
* (non-overlapping), or they must both start at the same address. Partially
* overlapping buffers are not supported. The conversion is done by truncation,
* without dithering, so it loses resolution.
*/
void memcpy_to_i16_from_float(int16_t *dst, const float *src, size_t count);
/* Copy samples from signed fixed-point 32-bit Q4.27 to single-precision
* floating-point. The nominal output float range is [-1.0, 1.0] if the
* fixed-point range is [0xf8000000, 0x07ffffff]. The full float range is
* [-16.0, 16.0]. Note the closed range at 1.0 and 16.0 is due to rounding on
* conversion to float. See float_from_q4_27() for details. Parameters: dst
* Destination buffer src Source buffer count Number of samples to copy
* The destination and source buffers must either be completely separate
* (non-overlapping), or they must both start at the same address. Partially
* overlapping buffers are not supported.
*/
void memcpy_to_float_from_q4_27(float *dst, const int32_t *src, size_t count);
/* Copy samples from signed fixed-point 16 bit Q0.15 to single-precision
* floating-point. The output float range is [-1.0, 1.0) for the fixed-point
* range [0x8000, 0x7fff]. No rounding is needed as the representation is exact.
* Parameters:
* dst Destination buffer
* src Source buffer
* count Number of samples to copy
* The destination and source buffers must be completely separate.
*/
void memcpy_to_float_from_i16(float *dst, const int16_t *src, size_t count);
/* Copy samples from unsigned fixed-point 8 bit to single-precision
* floating-point. The output float range is [-1.0, 1.0) for the fixed-point
* range [0x00, 0xFF]. No rounding is needed as the representation is exact.
* Parameters:
* dst Destination buffer
* src Source buffer
* count Number of samples to copy
* The destination and source buffers must be completely separate.
*/
void memcpy_to_float_from_u8(float *dst, const uint8_t *src, size_t count);
/* Copy samples from signed fixed-point packed 24 bit Q0.23 to single-precision
* floating-point. The packed 24 bit input is stored in native endian format in
* a uint8_t byte array. The output float range is [-1.0, 1.0) for the
* fixed-point range [0x800000, 0x7fffff]. No rounding is needed as the
* representation is exact. Parameters: dst Destination buffer src Source
* buffer count Number of samples to copy The destination and source buffers
* must be completely separate.
*/
void memcpy_to_float_from_p24(float *dst, const uint8_t *src, size_t count);
/* Copy samples from signed fixed-point packed 24 bit Q0.23 to signed fixed
* point 16 bit Q0.15. The packed 24 bit output is stored in native endian
* format in a uint8_t byte array. The data is truncated without rounding.
* Parameters:
* dst Destination buffer
* src Source buffer
* count Number of samples to copy
* The destination and source buffers must either be completely separate
* (non-overlapping), or they must both start at the same address. Partially
* overlapping buffers are not supported.
*/
void memcpy_to_i16_from_p24(int16_t *dst, const uint8_t *src, size_t count);
/* Copy samples from signed fixed-point packed 24 bit Q0.23 to signed
* fixed-point 32-bit Q0.31. The packed 24 bit input is stored in native endian
* format in a uint8_t byte array. The output data range is [0x80000000,
* 0x7fffff00] at intervals of 0x100. Parameters: dst Destination buffer src
* Source buffer count Number of samples to copy The destination and source
* buffers must be completely separate.
*/
void memcpy_to_i32_from_p24(int32_t *dst, const uint8_t *src, size_t count);
/* Copy samples from signed fixed point 16 bit Q0.15 to signed fixed-point
* packed 24 bit Q0.23. The packed 24 bit output is assumed to be a
* native-endian uint8_t byte array. The output data range is [0x800000,
* 0x7fff00] (not full). Nevertheless there is no DC offset on the output, if
* the input has no DC offset. Parameters: dst Destination buffer src Source
* buffer count Number of samples to copy The destination and source buffers
* must be completely separate.
*/
void memcpy_to_p24_from_i16(uint8_t *dst, const int16_t *src, size_t count);
/* Copy samples from single-precision floating-point to signed fixed-point
* packed 24 bit Q0.23. The packed 24 bit output is assumed to be a
* native-endian uint8_t byte array. The data is clamped and rounded to nearest,
* ties away from zero. See clamp24_from_float() for details. Parameters: dst
* Destination buffer src Source buffer count Number of samples to copy
* The destination and source buffers must either be completely separate
* (non-overlapping), or they must both start at the same address. Partially
* overlapping buffers are not supported.
*/
void memcpy_to_p24_from_float(uint8_t *dst, const float *src, size_t count);
/* Copy samples from signed fixed-point 32-bit Q8.23 to signed fixed-point
* packed 24 bit Q0.23. The packed 24 bit output is assumed to be a
* native-endian uint8_t byte array. The data is clamped to the range is
* [0x800000, 0x7fffff]. Parameters: dst Destination buffer src Source
* buffer count Number of samples to copy The destination and source buffers
* must be completely separate.
*/
void memcpy_to_p24_from_q8_23(uint8_t *dst, const int32_t *src, size_t count);
/* Shrink and copy samples from signed 32-bit fixed-point Q0.31
* to signed fixed-point packed 24 bit Q0.23.
* The packed 24 bit output is assumed to be a native-endian uint8_t byte array.
* Parameters:
* dst Destination buffer
* src Source buffer
* count Number of samples to copy
* The destination and source buffers must either be completely separate
* (non-overlapping), or they must both start at the same address. Partially
* overlapping buffers are not supported. The conversion is done by truncation,
* without dithering, so it loses resolution.
*/
void memcpy_to_p24_from_i32(uint8_t *dst, const int32_t *src, size_t count);
/* Copy samples from signed fixed point 16-bit Q0.15 to signed fixed-point
* 32-bit Q8.23. The output data range is [0xff800000, 0x007fff00] at intervals
* of 0x100. Parameters: dst Destination buffer src Source buffer count
* Number of samples to copy The destination and source buffers must be
* completely separate.
*/
void memcpy_to_q8_23_from_i16(int32_t *dst, const int16_t *src, size_t count);
/* Copy samples from single-precision floating-point to signed fixed-point
* 32-bit Q8.23. This copy will clamp the Q8.23 representation to [0xff800000,
* 0x007fffff] even though there are guard bits available. Fractional lsb is
* rounded to nearest, ties away from zero. See clamp24_from_float() for
* details. Parameters: dst Destination buffer src Source buffer count
* Number of samples to copy The destination and source buffers must either be
* completely separate (non-overlapping), or they must both start at the same
* address. Partially overlapping buffers are not supported.
*/
void memcpy_to_q8_23_from_float_with_clamp(int32_t *dst, const float *src,
size_t count);
/* Copy samples from signed fixed point packed 24-bit Q0.23 to signed
* fixed-point 32-bit Q8.23. The output data range is [0xff800000, 0x007fffff].
* Parameters:
* dst Destination buffer
* src Source buffer
* count Number of samples to copy
* The destination and source buffers must be completely separate.
*/
void memcpy_to_q8_23_from_p24(int32_t *dst, const uint8_t *src, size_t count);
/* Copy samples from single-precision floating-point to signed fixed-point
* 32-bit Q4.27. The conversion will use the full available Q4.27 range,
* including guard bits. Fractional lsb is rounded to nearest, ties away from
* zero. See clampq4_27_from_float() for details. Parameters: dst Destination
* buffer src Source buffer count Number of samples to copy The
* destination and source buffers must either be completely separate
* (non-overlapping), or they must both start at the same address. Partially
* overlapping buffers are not supported.
*/
void memcpy_to_q4_27_from_float(int32_t *dst, const float *src, size_t count);
/* Copy samples from signed fixed-point 32-bit Q8.23 to signed fixed point
* 16-bit Q0.15. The data is clamped, and truncated without rounding.
* Parameters:
* dst Destination buffer
* src Source buffer
* count Number of samples to copy
* The destination and source buffers must either be completely separate
* (non-overlapping), or they must both start at the same address. Partially
* overlapping buffers are not supported.
*/
void memcpy_to_i16_from_q8_23(int16_t *dst, const int32_t *src, size_t count);
/* Copy samples from signed fixed-point 32-bit Q8.23 to single-precision
* floating-point. The nominal output float range is [-1.0, 1.0) for the
* fixed-point range [0xff800000, 0x007fffff]. The maximum output float range is
* [-256.0, 256.0). No rounding is needed as the representation is exact for
* nominal values. Rounding for overflow values is to nearest, ties to even.
* Parameters:
* dst Destination buffer
* src Source buffer
* count Number of samples to copy
* The destination and source buffers must either be completely separate
* (non-overlapping), or they must both start at the same address. Partially
* overlapping buffers are not supported.
*/
void memcpy_to_float_from_q8_23(float *dst, const int32_t *src, size_t count);
/* Copy samples from signed fixed point 16-bit Q0.15 to signed fixed-point
* 32-bit Q0.31. The output data range is [0x80000000, 0x7fff0000] at intervals
* of 0x10000. Parameters: dst Destination buffer src Source buffer
* count Number of samples to copy
* The destination and source buffers must be completely separate.
*/
void memcpy_to_i32_from_i16(int32_t *dst, const int16_t *src, size_t count);
/* Copy samples from single-precision floating-point to signed fixed-point
* 32-bit Q0.31. If rounding is needed on truncation, the fractional lsb is
* rounded to nearest, ties away from zero. See clamp32_from_float() for
* details. Parameters: dst Destination buffer src Source buffer count
* Number of samples to copy The destination and source buffers must either be
* completely separate (non-overlapping), or they must both start at the same
* address. Partially overlapping buffers are not supported.
*/
void memcpy_to_i32_from_float(int32_t *dst, const float *src, size_t count);
/* Copy samples from signed fixed-point 32-bit Q0.31 to single-precision
* floating-point. The float range is [-1.0, 1.0] for the fixed-point range
* [0x80000000, 0x7fffffff]. Rounding is done according to float_from_i32().
* Parameters:
* dst Destination buffer
* src Source buffer
* count Number of samples to copy
* The destination and source buffers must either be completely separate
* (non-overlapping), or they must both start at the same address. Partially
* overlapping buffers are not supported.
*/
void memcpy_to_float_from_i32(float *dst, const int32_t *src, size_t count);
/* Downmix pairs of interleaved stereo input 16-bit samples to mono output
* 16-bit samples. Parameters: dst Destination buffer src Source buffer
* count Number of stereo frames to downmix
* The destination and source buffers must be completely separate
* (non-overlapping). The current implementation truncates the mean rather than
* dither, but this may change.
*/
void downmix_to_mono_i16_from_stereo_i16(int16_t *dst, const int16_t *src,
size_t count);
/* Upmix mono input 16-bit samples to pairs of interleaved stereo output 16-bit
* samples by duplicating. Parameters: dst Destination buffer src Source
* buffer count Number of mono samples to upmix The destination and source
* buffers must be completely separate (non-overlapping).
*/
void upmix_to_stereo_i16_from_mono_i16(int16_t *dst, const int16_t *src,
size_t count);
/* Downmix pairs of interleaved stereo input float samples to mono output float
* samples by averaging the stereo pair together. Parameters: dst Destination
* buffer src Source buffer count Number of stereo frames to downmix The
* destination and source buffers must be completely separate (non-overlapping),
* or they must both start at the same address.
*/
void downmix_to_mono_float_from_stereo_float(float *dst, const float *src,
size_t count);
/* Upmix mono input float samples to pairs of interleaved stereo output float
* samples by duplicating. Parameters: dst Destination buffer src Source
* buffer count Number of mono samples to upmix The destination and source
* buffers must be completely separate (non-overlapping).
*/
void upmix_to_stereo_float_from_mono_float(float *dst, const float *src,
size_t count);
/* Return the total number of non-zero 32-bit samples */
size_t nonZeroMono32(const int32_t *samples, size_t count);
/* Return the total number of non-zero 16-bit samples */
size_t nonZeroMono16(const int16_t *samples, size_t count);
/* Return the total number of non-zero stereo frames, where a frame is
* considered non-zero if either of its constituent 32-bit samples is non-zero
*/
size_t nonZeroStereo32(const int32_t *frames, size_t count);
/* Return the total number of non-zero stereo frames, where a frame is
* considered non-zero if either of its constituent 16-bit samples is non-zero
*/
size_t nonZeroStereo16(const int16_t *frames, size_t count);
/* Copy frames, selecting source samples based on a source channel mask to fit
* the destination channel mask. Unmatched channels in the destination channel
* mask are zero filled. Unmatched channels in the source channel mask are
* dropped. Channels present in the channel mask are represented by set bits in
* the uint32_t value and are matched without further interpretation.
* Parameters:
* dst Destination buffer
* dst_mask Bit mask corresponding to destination channels present
* src Source buffer
* src_mask Bit mask corresponding to source channels present
* sample_size Size of each sample in bytes. Must be 1, 2, 3, or 4.
* count Number of frames to copy
* The destination and source buffers must be completely separate
* (non-overlapping). If the sample size is not in range, the function will
* abort.
*/
void memcpy_by_channel_mask(void *dst, uint32_t dst_mask, const void *src,
uint32_t src_mask, size_t sample_size,
size_t count);
/* Copy frames, selecting source samples based on an index array (idxary).
* The idxary[] consists of dst_channels number of elements.
* The ith element if idxary[] corresponds the ith destination channel.
* A non-negative value is the channel index in the source frame.
* A negative index (-1) represents filling with 0.
*
* Example: Swapping L and R channels for stereo streams
* idxary[0] = 1;
* idxary[1] = 0;
*
* Example: Copying a mono source to the front center 5.1 channel
* idxary[0] = -1;
* idxary[1] = -1;
* idxary[2] = 0;
* idxary[3] = -1;
* idxary[4] = -1;
* idxary[5] = -1;
*
* This copy allows swizzling of channels or replication of channels.
*
* Parameters:
* dst Destination buffer
* dst_channels Number of destination channels per frame
* src Source buffer
* src_channels Number of source channels per frame
* idxary Array of indices representing channels in the source frame
* sample_size Size of each sample in bytes. Must be 1, 2, 3, or 4.
* count Number of frames to copy
* The destination and source buffers must be completely separate
* (non-overlapping). If the sample size is not in range, the function will
* abort.
*/
void memcpy_by_index_array(void *dst, uint32_t dst_channels, const void *src,
uint32_t src_channels, const int8_t *idxary,
size_t sample_size, size_t count);
/* Prepares an index array (idxary) from channel masks, which can be later
* used by memcpy_by_index_array(). Returns the number of array elements
* required. This may be greater than idxcount, so the return value should be
* checked if idxary size is less than 32. Note that idxary is a caller
* allocated array of at least as many channels as present in the dst_mask.
* Channels present in the channel mask are represented by set bits in the
* uint32_t value and are matched without further interpretation.
*
* This function is typically used for converting audio data with different
* channel position masks.
*
* Parameters:
* idxary Updated array of indices of channels in the src frame for the
* dst frame idxcount Number of caller allocated elements in idxary dst_mask
* Bit mask corresponding to destination channels present src_mask Bit mask
* corresponding to source channels present
*/
size_t memcpy_by_index_array_initialization(int8_t *idxary, size_t idxcount,
uint32_t dst_mask,
uint32_t src_mask);
/* Prepares an index array (idxary) from channel masks, which can be later
* used by memcpy_by_index_array(). Returns the number of array elements
* required.
*
* For a source channel index mask, the source channels will map to the
* destination channels as if counting the set bits in dst_mask in order from
* lsb to msb (zero bits are ignored). The ith bit of the src_mask corresponds
* to the ith SET bit of dst_mask and the ith destination channel. Hence, a
* zero ith bit of the src_mask indicates that the ith destination channel plays
* silence.
*
* Parameters:
* idxary Updated array of indices of channels in the src frame for the
* dst frame idxcount Number of caller allocated elements in idxary dst_mask
* Bit mask corresponding to destination channels present src_mask Bit mask
* corresponding to source channels present
*/
size_t memcpy_by_index_array_initialization_src_index(int8_t *idxary,
size_t idxcount,
uint32_t dst_mask,
uint32_t src_mask);
/* Prepares an index array (idxary) from channel mask bits, which can be later
* used by memcpy_by_index_array(). Returns the number of array elements
* required.
*
* This initialization is for a destination channel index mask from a positional
* source mask.
*
* For an destination channel index mask, the input channels will map
* to the destination channels, with the ith SET bit in the source bits
* corresponding to the ith bit in the destination bits. If there is a zero bit
* in the middle of set destination bits (unlikely), the corresponding source
* channel will be dropped.
*
* Parameters:
* idxary Updated array of indices of channels in the src frame for the
* dst frame idxcount Number of caller allocated elements in idxary dst_mask
* Bit mask corresponding to destination channels present src_mask Bit mask
* corresponding to source channels present
*/
size_t memcpy_by_index_array_initialization_dst_index(int8_t *idxary,
size_t idxcount,
uint32_t dst_mask,
uint32_t src_mask);
/**
* Clamp (aka hard limit or clip) a signed 32-bit sample to 16-bit range.
*/
static inline int16_t clamp16(int32_t sample) {
if ((sample >> 15) ^ (sample >> 31))
sample = 0x7FFF ^ (sample >> 31);
return sample;
}
/*
* Convert a IEEE 754 single precision float [-1.0, 1.0) to int16_t [-32768,
* 32767] with clamping. Note the open bound at 1.0, values within 1/65536
* of 1.0 map to 32767 instead of 32768 (early clamping due to the smaller
* positive integer subrange).
*
* Values outside the range [-1.0, 1.0) are properly clamped to -32768 and
* 32767, including -Inf and +Inf. NaN will generally be treated either as
* -32768 or 32767, depending on the sign bit inside NaN (whose representation
* is not unique). Nevertheless, strictly speaking, NaN behavior should be
* considered undefined.
*
* Rounding of 0.5 lsb is to even (default for IEEE 754).
*/
static inline int16_t clamp16_from_float(float f) {
/* Offset is used to expand the valid range of [-1.0, 1.0) into the 16 lsbs of
* the floating point significand. The normal shift is 3<<22, but the -15
* offset is used to multiply by 32768.
*/
static const float offset = (float)(3 << (22 - 15));
/* zero = (0x10f << 22) = 0x43c00000 (not directly used) */
static const int32_t limneg = (0x10f << 22) /*zero*/ - 32768; /* 0x43bf8000 */
static const int32_t limpos = (0x10f << 22) /*zero*/ + 32767; /* 0x43c07fff */
union {
float f;
int32_t i;
} u;
u.f = f + offset; /* recenter valid range */
/* Now the valid range is represented as integers between [limneg, limpos].
* Clamp using the fact that float representation (as an integer) is an
* ordered set.
*/
if (u.i < limneg)
u.i = -32768;
else if (u.i > limpos)
u.i = 32767;
return u
.i; /* Return lower 16 bits, the part of interest in the significand. */
}
/*
* Convert a IEEE 754 single precision float [-1.0, 1.0) to uint8_t [0, 0xff]
* with clamping. Note the open bound at 1.0, values within 1/128 of 1.0 map
* to 255 instead of 256 (early clamping due to the smaller positive integer
* subrange).
*
* Values outside the range [-1.0, 1.0) are properly clamped to 0 and 255,
* including -Inf and +Inf. NaN will generally be treated either as 0 or 255,
* depending on the sign bit inside NaN (whose representation is not unique).
* Nevertheless, strictly speaking, NaN behavior should be considered undefined.
*
* Rounding of 0.5 lsb is to even (default for IEEE 754).
*/
static inline uint8_t clamp8_from_float(float f) {
/* Offset is used to expand the valid range of [-1.0, 1.0) into the 16 lsbs of
* the floating point significand. The normal shift is 3<<22, but the -7
* offset is used to multiply by 128.
*/
static const float offset = (float)((3 << (22 - 7)) + 1 /* to cancel -1.0 */);
/* zero = (0x11f << 22) = 0x47c00000 */
static const int32_t limneg = (0x11f << 22) /*zero*/;
static const int32_t limpos = (0x11f << 22) /*zero*/ + 255; /* 0x47c000ff */
union {
float f;
int32_t i;
} u;
u.f = f + offset; /* recenter valid range */
/* Now the valid range is represented as integers between [limneg, limpos].
* Clamp using the fact that float representation (as an integer) is an
* ordered set.
*/
if (u.i < limneg)
return 0;
if (u.i > limpos)
return 255;
return u
.i; /* Return lower 8 bits, the part of interest in the significand. */
}
/* Convert a single-precision floating point value to a Q0.23 integer value,
* stored in a 32 bit signed integer (technically stored as Q8.23, but clamped
* to Q0.23).
*
* Rounds to nearest, ties away from 0.
*
* Values outside the range [-1.0, 1.0) are properly clamped to -8388608 and
* 8388607, including -Inf and +Inf. NaN values are considered undefined, and
* behavior may change depending on hardware and future implementation of this
* function.
*/
static inline int32_t clamp24_from_float(float f) {
static const float scale = (float)(1 << 23);
static const float limpos = 0x7fffff / (float)(1 << 23);
static const float limneg = -0x800000 / (float)(1 << 23);
if (f <= limneg) {
return -0x800000;
} else if (f >= limpos) {
return 0x7fffff;
}
f *= scale;
/* integer conversion is through truncation (though int to float is not).
* ensure that we round to nearest, ties away from 0.
*/
return f > 0 ? f + 0.5 : f - 0.5;
}
/* Convert a signed fixed-point 32-bit Q8.23 value to a Q0.23 integer value,
* stored in a 32-bit signed integer (technically stored as Q8.23, but clamped
* to Q0.23).
*
* Values outside the range [-0x800000, 0x7fffff] are clamped to that range.
*/
static inline int32_t clamp24_from_q8_23(int32_t ival) {
static const int32_t limpos = 0x7fffff;
static const int32_t limneg = -0x800000;
if (ival < limneg) {
return limneg;
} else if (ival > limpos) {
return limpos;
} else {
return ival;
}
}
/* Convert a single-precision floating point value to a Q4.27 integer value.
* Rounds to nearest, ties away from 0.
*
* Values outside the range [-16.0, 16.0) are properly clamped to -2147483648
* and 2147483647, including -Inf and +Inf. NaN values are considered undefined,
* and behavior may change depending on hardware and future implementation of
* this function.
*/
static inline int32_t clampq4_27_from_float(float f) {
static const float scale = (float)(1UL << 27);
static const float limpos = 16.;
static const float limneg = -16.;
if (f <= limneg) {
return -0x80000000; /* or 0x80000000 */
} else if (f >= limpos) {
return 0x7fffffff;
}
f *= scale;
/* integer conversion is through truncation (though int to float is not).
* ensure that we round to nearest, ties away from 0.
*/
return f > 0 ? f + 0.5 : f - 0.5;
}
/* Convert a single-precision floating point value to a Q0.31 integer value.
* Rounds to nearest, ties away from 0.
*
* Values outside the range [-1.0, 1.0) are properly clamped to -2147483648 and
* 2147483647, including -Inf and +Inf. NaN values are considered undefined, and
* behavior may change depending on hardware and future implementation of this
* function.
*/
static inline int32_t clamp32_from_float(float f) {
static const float scale = (float)(1UL << 31);
static const float limpos = 1.;
static const float limneg = -1.;
if (f <= limneg) {
return -0x80000000; /* or 0x80000000 */
} else if (f >= limpos) {
return 0x7fffffff;
}
f *= scale;
/* integer conversion is through truncation (though int to float is not).
* ensure that we round to nearest, ties away from 0.
*/
return f > 0 ? f + 0.5 : f - 0.5;
}
/* Convert a signed fixed-point 32-bit Q4.27 value to single-precision
* floating-point. The nominal output float range is [-1.0, 1.0] if the
* fixed-point range is [0xf8000000, 0x07ffffff]. The full float range is
* [-16.0, 16.0].
*
* Note the closed range at 1.0 and 16.0 is due to rounding on conversion to
* float. In more detail: if the fixed-point integer exceeds 24 bit significand
* of single precision floating point, the 0.5 lsb in the significand conversion
* will round towards even, as per IEEE 754 default.
*/
static inline float float_from_q4_27(int32_t ival) {
/* The scale factor is the reciprocal of the fractional bits.
*
* Since the scale factor is a power of 2, the scaling is exact, and there
* is no rounding due to the multiplication - the bit pattern is preserved.
* However, there may be rounding due to the fixed-point to float conversion,
* as described above.
*/
static const float scale = 1. / (float)(1UL << 27);
return ival * scale;
}
/* Convert an unsigned fixed-point 32-bit U4.28 value to single-precision
* floating-point. The nominal output float range is [0.0, 1.0] if the
* fixed-point range is [0x00000000, 0x10000000]. The full float range is
* [0.0, 16.0].
*
* Note the closed range at 1.0 and 16.0 is due to rounding on conversion to
* float. In more detail: if the fixed-point integer exceeds 24 bit significand
* of single precision floating point, the 0.5 lsb in the significand conversion
* will round towards even, as per IEEE 754 default.
*/
static inline float float_from_u4_28(uint32_t uval) {
static const float scale = 1. / (float)(1UL << 28);
return uval * scale;
}
/* Convert an unsigned fixed-point 16-bit U4.12 value to single-precision
* floating-point. The nominal output float range is [0.0, 1.0] if the
* fixed-point range is [0x0000, 0x1000]. The full float range is [0.0, 16.0).
*/
static inline float float_from_u4_12(uint16_t uval) {
static const float scale = 1. / (float)(1UL << 12);
return uval * scale;
}
/* Convert a single-precision floating point value to a U4.28 integer value.
* Rounds to nearest, ties away from 0.
*
* Values outside the range [0, 16.0] are properly clamped to [0, 4294967295]
* including -Inf and +Inf. NaN values are considered undefined, and behavior
* may change depending on hardware and future implementation of this function.
*/
static inline uint32_t u4_28_from_float(float f) {
static const float scale = (float)(1 << 28);
static const float limpos = (float)((double)0xffffffffUL / (double)(1 << 28));
if (f <= 0.) {
return 0;
} else if (f >= limpos) {
return 0xffffffff;
}
/* integer conversion is through truncation (though int to float is not).
* ensure that we round to nearest, ties away from 0.
*/
return f * scale + 0.5;
}
/* Convert a single-precision floating point value to a U4.12 integer value.
* Rounds to nearest, ties away from 0.
*
* Values outside the range [0, 16.0) are properly clamped to [0, 65535]
* including -Inf and +Inf. NaN values are considered undefined, and behavior
* may change depending on hardware and future implementation of this function.
*/
static inline uint16_t u4_12_from_float(float f) {
static const float scale = (float)(1 << 12);
static const float limpos = 0xffff / (float)(1 << 12);
if (f <= 0.) {
return 0;
} else if (f >= limpos) {
return 0xffff;
}
/* integer conversion is through truncation (though int to float is not).
* ensure that we round to nearest, ties away from 0.
*/
return f * scale + 0.5;
}
/* Convert a signed fixed-point 16-bit Q0.15 value to single-precision
* floating-point. The output float range is [-1.0, 1.0) for the fixed-point
* range [0x8000, 0x7fff].
*
* There is no rounding, the conversion and representation is exact.
*/
static inline float float_from_i16(int16_t ival) {
/* The scale factor is the reciprocal of the nominal 16 bit integer
* half-sided range (32768).
*
* Since the scale factor is a power of 2, the scaling is exact, and there
* is no rounding due to the multiplication - the bit pattern is preserved.
*/
static const float scale = 1. / (float)(1UL << 15);
return ival * scale;
}
/* Convert an unsigned fixed-point 8-bit U0.8 value to single-precision
* floating-point. The nominal output float range is [-1.0, 1.0) if the
* fixed-point range is [0x00, 0xff].
*/
static inline float float_from_u8(uint8_t uval) {
static const float scale = 1. / (float)(1UL << 7);
return ((int)uval - 128) * scale;
}
/* Convert a packed 24bit Q0.23 value stored native-endian in a uint8_t ptr
* to a signed fixed-point 32 bit integer Q0.31 value. The output Q0.31 range
* is [0x80000000, 0x7fffff00] for the fixed-point range [0x800000, 0x7fffff].
* Even though the output range is limited on the positive side, there is no
* DC offset on the output, if the input has no DC offset.
*
* Avoid relying on the limited output range, as future implementations may go
* to full range.
*/
static inline int32_t i32_from_p24(const uint8_t *packed24) {
/* convert to 32b */
return (packed24[0] << 8) | (packed24[1] << 16) | (packed24[2] << 24);
}
/* Convert a 32-bit Q0.31 value to single-precision floating-point.
* The output float range is [-1.0, 1.0] for the fixed-point range
* [0x80000000, 0x7fffffff].
*
* Rounding may occur in the least significant 8 bits for large fixed point
* values due to storage into the 24-bit floating-point significand.
* Rounding will be to nearest, ties to even.
*/
static inline float float_from_i32(int32_t ival) {
static const float scale = 1. / (float)(1UL << 31);
return ival * scale;
}
/* Convert a packed 24bit Q0.23 value stored native endian in a uint8_t ptr
* to single-precision floating-point. The output float range is [-1.0, 1.0)
* for the fixed-point range [0x800000, 0x7fffff].
*
* There is no rounding, the conversion and representation is exact.
*/
static inline float float_from_p24(const uint8_t *packed24) {
return float_from_i32(i32_from_p24(packed24));
}
/* Convert a 24-bit Q8.23 value to single-precision floating-point.
* The nominal output float range is [-1.0, 1.0) for the fixed-point
* range [0xff800000, 0x007fffff]. The maximum float range is [-256.0, 256.0).
*
* There is no rounding in the nominal range, the conversion and representation
* is exact. For values outside the nominal range, rounding is to nearest, ties
* to even.
*/
static inline float float_from_q8_23(int32_t ival) {
static const float scale = 1. / (float)(1UL << 23);
return ival * scale;
}
/**
* Multiply-accumulate 16-bit terms with 32-bit result: return a + in*v.
*/
static inline int32_t mulAdd(int16_t in, int16_t v, int32_t a) {
#if defined(__arm__) && !defined(__thumb__)
int32_t out;
asm("smlabb %[out], %[in], %[v], %[a] \n"
: [out] "=r"(out)
: [in] "%r"(in), [v] "r"(v), [a] "r"(a)
:);
return out;
#else
return a + in * (int32_t)v;
#endif
}
/**
* Multiply 16-bit terms with 32-bit result: return in*v.
*/
static inline int32_t mul(int16_t in, int16_t v) {
#if defined(__arm__) && !defined(__thumb__)
int32_t out;
asm("smulbb %[out], %[in], %[v] \n"
: [out] "=r"(out)
: [in] "%r"(in), [v] "r"(v)
:);
return out;
#else
return in * (int32_t)v;
#endif
}
/**
* Similar to mulAdd, but the 16-bit terms are extracted from a 32-bit
* interleaved stereo pair.
*/
static inline int32_t mulAddRL(int left, uint32_t inRL, uint32_t vRL,
int32_t a) {
#if defined(__arm__) && !defined(__thumb__)
int32_t out;
if (left) {
asm("smlabb %[out], %[inRL], %[vRL], %[a] \n"
: [out] "=r"(out)
: [inRL] "%r"(inRL), [vRL] "r"(vRL), [a] "r"(a)
:);
} else {
asm("smlatt %[out], %[inRL], %[vRL], %[a] \n"
: [out] "=r"(out)
: [inRL] "%r"(inRL), [vRL] "r"(vRL), [a] "r"(a)
:);
}
return out;
#else
if (left) {
return a + (int16_t)(inRL & 0xFFFF) * (int16_t)(vRL & 0xFFFF);
} else {
return a + (int16_t)(inRL >> 16) * (int16_t)(vRL >> 16);
}
#endif
}
/**
* Similar to mul, but the 16-bit terms are extracted from a 32-bit interleaved
* stereo pair.
*/
static inline int32_t mulRL(int left, uint32_t inRL, uint32_t vRL) {
#if defined(__arm__) && !defined(__thumb__)
int32_t out;
if (left) {
asm("smulbb %[out], %[inRL], %[vRL] \n"
: [out] "=r"(out)
: [inRL] "%r"(inRL), [vRL] "r"(vRL)
:);
} else {
asm("smultt %[out], %[inRL], %[vRL] \n"
: [out] "=r"(out)
: [inRL] "%r"(inRL), [vRL] "r"(vRL)
:);
}
return out;
#else
if (left) {
return (int16_t)(inRL & 0xFFFF) * (int16_t)(vRL & 0xFFFF);
} else {
return (int16_t)(inRL >> 16) * (int16_t)(vRL >> 16);
}
#endif
}
__END_DECLS
#endif // COCOS_AUDIO_PRIMITIVES_H

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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <cmath>
#include "audio/android/audio_utils/include/audio_utils/minifloat.h"
#define EXPONENT_BITS 3
#define EXPONENT_MAX ((1 << EXPONENT_BITS) - 1)
#define EXCESS ((1 << EXPONENT_BITS) - 2)
#define MANTISSA_BITS 13
#define MANTISSA_MAX ((1 << MANTISSA_BITS) - 1)
#define HIDDEN_BIT (1 << MANTISSA_BITS)
#define ONE_FLOAT ((float) (1 << (MANTISSA_BITS + 1)))
#define MINIFLOAT_MAX ((EXPONENT_MAX << MANTISSA_BITS) | MANTISSA_MAX)
#if EXPONENT_BITS + MANTISSA_BITS != 16
#error EXPONENT_BITS and MANTISSA_BITS must sum to 16
#endif
extern "C" {
gain_minifloat_t gain_from_float(float v)
{
if (std::isnan(v) || v <= 0.0f)
{
return 0;
}
if (v >= 2.0f)
{
return MINIFLOAT_MAX;
}
int exp;
float r = frexpf(v, &exp);
if ((exp += EXCESS) > EXPONENT_MAX)
{
return MINIFLOAT_MAX;
}
if (-exp >= MANTISSA_BITS)
{
return 0;
}
int mantissa = (int) (r * ONE_FLOAT);
return exp > 0 ? (exp << MANTISSA_BITS) | (mantissa & ~HIDDEN_BIT) :
(mantissa >> (1 - exp)) & MANTISSA_MAX;
}
float float_from_gain(gain_minifloat_t a)
{
int mantissa = a & MANTISSA_MAX;
int exponent = (a >> MANTISSA_BITS) & EXPONENT_MAX;
return ldexpf((exponent > 0 ? HIDDEN_BIT | mantissa : mantissa << 1) / ONE_FLOAT,
exponent - EXCESS);
}
} // extern "C" {

526
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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "audio/android/cutils/bitops.h" /* for popcount() */
#include "audio/android/audio_utils/include/audio_utils/primitives.h"
#include "audio/android/audio_utils/private/private.h"
void ditherAndClamp(int32_t* out, const int32_t *sums, size_t c)
{
size_t i;
for (i=0 ; i<c ; i++) {
int32_t l = *sums++;
int32_t r = *sums++;
int32_t nl = l >> 12;
int32_t nr = r >> 12;
l = clamp16(nl);
r = clamp16(nr);
*out++ = (r<<16) | (l & 0xFFFF);
}
}
void memcpy_to_i16_from_u8(int16_t *dst, const uint8_t *src, size_t count)
{
dst += count;
src += count;
while (count--) {
*--dst = (int16_t)(*--src - 0x80) << 8;
}
}
void memcpy_to_u8_from_i16(uint8_t *dst, const int16_t *src, size_t count)
{
while (count--) {
*dst++ = (*src++ >> 8) + 0x80;
}
}
void memcpy_to_u8_from_float(uint8_t *dst, const float *src, size_t count)
{
while (count--) {
*dst++ = clamp8_from_float(*src++);
}
}
void memcpy_to_i16_from_i32(int16_t *dst, const int32_t *src, size_t count)
{
while (count--) {
*dst++ = *src++ >> 16;
}
}
void memcpy_to_i16_from_float(int16_t *dst, const float *src, size_t count)
{
while (count--) {
*dst++ = clamp16_from_float(*src++);
}
}
void memcpy_to_float_from_q4_27(float *dst, const int32_t *src, size_t count)
{
while (count--) {
*dst++ = float_from_q4_27(*src++);
}
}
void memcpy_to_float_from_i16(float *dst, const int16_t *src, size_t count)
{
while (count--) {
*dst++ = float_from_i16(*src++);
}
}
void memcpy_to_float_from_u8(float *dst, const uint8_t *src, size_t count)
{
while (count--) {
*dst++ = float_from_u8(*src++);
}
}
void memcpy_to_float_from_p24(float *dst, const uint8_t *src, size_t count)
{
while (count--) {
*dst++ = float_from_p24(src);
src += 3;
}
}
void memcpy_to_i16_from_p24(int16_t *dst, const uint8_t *src, size_t count)
{
while (count--) {
#ifdef HAVE_BIG_ENDIAN
*dst++ = src[1] | (src[0] << 8);
#else
*dst++ = src[1] | (src[2] << 8);
#endif
src += 3;
}
}
void memcpy_to_i32_from_p24(int32_t *dst, const uint8_t *src, size_t count)
{
while (count--) {
#ifdef HAVE_BIG_ENDIAN
*dst++ = (src[2] << 8) | (src[1] << 16) | (src[0] << 24);
#else
*dst++ = (src[0] << 8) | (src[1] << 16) | (src[2] << 24);
#endif
src += 3;
}
}
void memcpy_to_p24_from_i16(uint8_t *dst, const int16_t *src, size_t count)
{
while (count--) {
#ifdef HAVE_BIG_ENDIAN
*dst++ = *src >> 8;
*dst++ = *src++;
*dst++ = 0;
#else
*dst++ = 0;
*dst++ = *src;
*dst++ = *src++ >> 8;
#endif
}
}
void memcpy_to_p24_from_float(uint8_t *dst, const float *src, size_t count)
{
while (count--) {
int32_t ival = clamp24_from_float(*src++);
#ifdef HAVE_BIG_ENDIAN
*dst++ = ival >> 16;
*dst++ = ival >> 8;
*dst++ = ival;
#else
*dst++ = ival;
*dst++ = ival >> 8;
*dst++ = ival >> 16;
#endif
}
}
void memcpy_to_p24_from_q8_23(uint8_t *dst, const int32_t *src, size_t count)
{
while (count--) {
int32_t ival = clamp24_from_q8_23(*src++);
#ifdef HAVE_BIG_ENDIAN
*dst++ = ival >> 16;
*dst++ = ival >> 8;
*dst++ = ival;
#else
*dst++ = ival;
*dst++ = ival >> 8;
*dst++ = ival >> 16;
#endif
}
}
void memcpy_to_p24_from_i32(uint8_t *dst, const int32_t *src, size_t count)
{
while (count--) {
int32_t ival = *src++ >> 8;
#ifdef HAVE_BIG_ENDIAN
*dst++ = ival >> 16;
*dst++ = ival >> 8;
*dst++ = ival;
#else
*dst++ = ival;
*dst++ = ival >> 8;
*dst++ = ival >> 16;
#endif
}
}
void memcpy_to_q8_23_from_i16(int32_t *dst, const int16_t *src, size_t count)
{
while (count--) {
*dst++ = (int32_t)*src++ << 8;
}
}
void memcpy_to_q8_23_from_float_with_clamp(int32_t *dst, const float *src, size_t count)
{
while (count--) {
*dst++ = clamp24_from_float(*src++);
}
}
void memcpy_to_q8_23_from_p24(int32_t *dst, const uint8_t *src, size_t count)
{
while (count--) {
#ifdef HAVE_BIG_ENDIAN
*dst++ = (int8_t)src[0] << 16 | src[1] << 8 | src[2];
#else
*dst++ = (int8_t)src[2] << 16 | src[1] << 8 | src[0];
#endif
src += 3;
}
}
void memcpy_to_q4_27_from_float(int32_t *dst, const float *src, size_t count)
{
while (count--) {
*dst++ = clampq4_27_from_float(*src++);
}
}
void memcpy_to_i16_from_q8_23(int16_t *dst, const int32_t *src, size_t count)
{
while (count--) {
*dst++ = clamp16(*src++ >> 8);
}
}
void memcpy_to_float_from_q8_23(float *dst, const int32_t *src, size_t count)
{
while (count--) {
*dst++ = float_from_q8_23(*src++);
}
}
void memcpy_to_i32_from_i16(int32_t *dst, const int16_t *src, size_t count)
{
while (count--) {
*dst++ = (int32_t)*src++ << 16;
}
}
void memcpy_to_i32_from_float(int32_t *dst, const float *src, size_t count)
{
while (count--) {
*dst++ = clamp32_from_float(*src++);
}
}
void memcpy_to_float_from_i32(float *dst, const int32_t *src, size_t count)
{
while (count--) {
*dst++ = float_from_i32(*src++);
}
}
void downmix_to_mono_i16_from_stereo_i16(int16_t *dst, const int16_t *src, size_t count)
{
while (count--) {
*dst++ = (int16_t)(((int32_t)src[0] + (int32_t)src[1]) >> 1);
src += 2;
}
}
void upmix_to_stereo_i16_from_mono_i16(int16_t *dst, const int16_t *src, size_t count)
{
while (count--) {
int32_t temp = *src++;
dst[0] = temp;
dst[1] = temp;
dst += 2;
}
}
void downmix_to_mono_float_from_stereo_float(float *dst, const float *src, size_t frames)
{
while (frames--) {
*dst++ = (src[0] + src[1]) * 0.5;
src += 2;
}
}
void upmix_to_stereo_float_from_mono_float(float *dst, const float *src, size_t frames)
{
while (frames--) {
float temp = *src++;
dst[0] = temp;
dst[1] = temp;
dst += 2;
}
}
size_t nonZeroMono32(const int32_t *samples, size_t count)
{
size_t nonZero = 0;
while (count-- > 0) {
if (*samples++ != 0) {
nonZero++;
}
}
return nonZero;
}
size_t nonZeroMono16(const int16_t *samples, size_t count)
{
size_t nonZero = 0;
while (count-- > 0) {
if (*samples++ != 0) {
nonZero++;
}
}
return nonZero;
}
size_t nonZeroStereo32(const int32_t *frames, size_t count)
{
size_t nonZero = 0;
while (count-- > 0) {
if (frames[0] != 0 || frames[1] != 0) {
nonZero++;
}
frames += 2;
}
return nonZero;
}
size_t nonZeroStereo16(const int16_t *frames, size_t count)
{
size_t nonZero = 0;
while (count-- > 0) {
if (frames[0] != 0 || frames[1] != 0) {
nonZero++;
}
frames += 2;
}
return nonZero;
}
/*
* C macro to do channel mask copying independent of dst/src sample type.
* Don't pass in any expressions for the macro arguments here.
*/
#define copy_frame_by_mask(dst, dmask, src, smask, count, zero) \
{ \
uint32_t bit, ormask; \
while ((count)--) { \
ormask = (dmask) | (smask); \
while (ormask) { \
bit = ormask & -ormask; /* get lowest bit */ \
ormask ^= bit; /* remove lowest bit */ \
if ((dmask) & bit) { \
*(dst)++ = (smask) & bit ? *(src)++ : (zero); \
} else { /* source channel only */ \
++(src); \
} \
} \
} \
}
void memcpy_by_channel_mask(void *dst, uint32_t dst_mask,
const void *src, uint32_t src_mask, size_t sample_size, size_t count)
{
#if 0
/* alternate way of handling memcpy_by_channel_mask by using the idxary */
int8_t idxary[32];
uint32_t src_channels = popcount(src_mask);
uint32_t dst_channels =
memcpy_by_index_array_initialization(idxary, 32, dst_mask, src_mask);
memcpy_by_idxary(dst, dst_channels, src, src_channels, idxary, sample_size, count);
#else
if (dst_mask == src_mask) {
memcpy(dst, src, sample_size * popcount(dst_mask) * count);
return;
}
switch (sample_size) {
case 1: {
uint8_t *udst = (uint8_t*)dst;
const uint8_t *usrc = (const uint8_t*)src;
copy_frame_by_mask(udst, dst_mask, usrc, src_mask, count, 0);
} break;
case 2: {
uint16_t *udst = (uint16_t*)dst;
const uint16_t *usrc = (const uint16_t*)src;
copy_frame_by_mask(udst, dst_mask, usrc, src_mask, count, 0);
} break;
case 3: { /* could be slow. use a struct to represent 3 bytes of data. */
uint8x3_t *udst = (uint8x3_t*)dst;
const uint8x3_t *usrc = (const uint8x3_t*)src;
static const uint8x3_t zero; /* tricky - we use this to zero out a sample */
copy_frame_by_mask(udst, dst_mask, usrc, src_mask, count, zero);
} break;
case 4: {
uint32_t *udst = (uint32_t*)dst;
const uint32_t *usrc = (const uint32_t*)src;
copy_frame_by_mask(udst, dst_mask, usrc, src_mask, count, 0);
} break;
default:
abort(); /* illegal value */
break;
}
#endif
}
/*
* C macro to do copying by index array, to rearrange samples
* within a frame. This is independent of src/dst sample type.
* Don't pass in any expressions for the macro arguments here.
*/
#define copy_frame_by_idx(dst, dst_channels, src, src_channels, idxary, count, zero) \
{ \
unsigned i; \
int index; \
while ((count)--) { \
for (i = 0; i < (dst_channels); ++i) { \
index = (idxary)[i]; \
*(dst)++ = index < 0 ? (zero) : (src)[index]; \
} \
(src) += (src_channels); \
} \
}
void memcpy_by_index_array(void *dst, uint32_t dst_channels,
const void *src, uint32_t src_channels,
const int8_t *idxary, size_t sample_size, size_t count)
{
switch (sample_size) {
case 1: {
uint8_t *udst = (uint8_t*)dst;
const uint8_t *usrc = (const uint8_t*)src;
copy_frame_by_idx(udst, dst_channels, usrc, src_channels, idxary, count, 0);
} break;
case 2: {
uint16_t *udst = (uint16_t*)dst;
const uint16_t *usrc = (const uint16_t*)src;
copy_frame_by_idx(udst, dst_channels, usrc, src_channels, idxary, count, 0);
} break;
case 3: { /* could be slow. use a struct to represent 3 bytes of data. */
uint8x3_t *udst = (uint8x3_t*)dst;
const uint8x3_t *usrc = (const uint8x3_t*)src;
static const uint8x3_t zero;
copy_frame_by_idx(udst, dst_channels, usrc, src_channels, idxary, count, zero);
} break;
case 4: {
uint32_t *udst = (uint32_t*)dst;
const uint32_t *usrc = (const uint32_t*)src;
copy_frame_by_idx(udst, dst_channels, usrc, src_channels, idxary, count, 0);
} break;
default:
abort(); /* illegal value */
break;
}
}
size_t memcpy_by_index_array_initialization(int8_t *idxary, size_t idxcount,
uint32_t dst_mask, uint32_t src_mask)
{
size_t n = 0;
int srcidx = 0;
uint32_t bit, ormask = src_mask | dst_mask;
while (ormask && n < idxcount) {
bit = ormask & -ormask; /* get lowest bit */
ormask ^= bit; /* remove lowest bit */
if (src_mask & dst_mask & bit) { /* matching channel */
idxary[n++] = srcidx++;
} else if (src_mask & bit) { /* source channel only */
++srcidx;
} else { /* destination channel only */
idxary[n++] = -1;
}
}
return n + popcount(ormask & dst_mask);
}
size_t memcpy_by_index_array_initialization_src_index(int8_t *idxary, size_t idxcount,
uint32_t dst_mask, uint32_t src_mask) {
size_t dst_count = popcount(dst_mask);
if (idxcount == 0) {
return dst_count;
}
if (dst_count > idxcount) {
dst_count = idxcount;
}
size_t src_idx, dst_idx;
for (src_idx = 0, dst_idx = 0; dst_idx < dst_count; ++dst_idx) {
if (src_mask & 1) {
idxary[dst_idx] = src_idx++;
} else {
idxary[dst_idx] = -1;
}
src_mask >>= 1;
}
return dst_idx;
}
size_t memcpy_by_index_array_initialization_dst_index(int8_t *idxary, size_t idxcount,
uint32_t dst_mask, uint32_t src_mask) {
size_t src_idx, dst_idx;
size_t dst_count = __builtin_popcount(dst_mask);
size_t src_count = __builtin_popcount(src_mask);
if (idxcount == 0) {
return dst_count;
}
if (dst_count > idxcount) {
dst_count = idxcount;
}
for (src_idx = 0, dst_idx = 0; dst_idx < dst_count; ++src_idx) {
if (dst_mask & 1) {
idxary[dst_idx++] = src_idx < src_count ? (signed)src_idx : -1;
}
dst_mask >>= 1;
}
return dst_idx;
}

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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_AUDIO_PRIVATE_H
#define ANDROID_AUDIO_PRIVATE_H
#include <stdint.h>
__BEGIN_DECLS
/* Defines not necessary for external use but kept here to be common
* to the audio_utils library.
*/
/* struct representation of 3 bytes for packed PCM 24 bit data.
* The naming follows the ARM NEON convention.
*/
typedef struct {uint8_t c[3];} __attribute__((__packed__)) uint8x3_t;
__END_DECLS
#endif /*ANDROID_AUDIO_PRIVATE_H*/