| 1 | /* Copyright (C) 2010-2023 The RetroArch team |
| 2 | * |
| 3 | * --------------------------------------------------------------------------------------- |
| 4 | * The following license statement only applies to this file (s16_to_float.h). |
| 5 | * --------------------------------------------------------------------------------------- |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, |
| 8 | * to any person obtaining a copy of this software and associated documentation files (the "Software"), |
| 9 | * to deal in the Software without restriction, including without limitation the rights to |
| 10 | * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| 11 | * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
| 16 | * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| 18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| 19 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 21 | */ |
| 22 | #ifndef __LIBRETRO_SDK_CONVERSION_DUAL_MONO__ |
| 23 | #define __LIBRETRO_SDK_CONVERSION_DUAL_MONO__ |
| 24 | |
| 25 | #include <stdint.h> |
| 26 | #include <stddef.h> |
| 27 | |
| 28 | #include <retro_common_api.h> |
| 29 | |
| 30 | RETRO_BEGIN_DECLS |
| 31 | |
| 32 | /** |
| 33 | * Duplicates 1-channel (mono) frames into 2-channel (stereo) frames. |
| 34 | * The resulting array is suitable for use in the resampler, |
| 35 | * or for any use case that demands stereo input. |
| 36 | * This version operates on 32-bit floating-point samples. |
| 37 | * |
| 38 | * May use SIMD intrinsics on supported platforms, |
| 39 | * but will work without them. |
| 40 | * |
| 41 | * Will do nothing if \c out or \c in are \c NULL. |
| 42 | * |
| 43 | * @param[out] out The location in which the converted frames will be stored. |
| 44 | * Must have enough room for twice the value of \c frames. |
| 45 | * @param[in] in The location of the frames to convert. |
| 46 | * @param[in] frames The number of frames to convert. |
| 47 | */ |
| 48 | void convert_to_dual_mono_float(float *out, const float *in, size_t frames); |
| 49 | |
| 50 | /** |
| 51 | * Downmixes 2-channel (stereo) frames into 1-channel (mono) frames. |
| 52 | * This is intended for dual-mono audio (i.e. where both channels are identical), |
| 53 | * but it will work if both channels are different. |
| 54 | * |
| 55 | * This version operates on 32-bit floating-point samples. |
| 56 | * It preserves the left channel and ignores the right channel. |
| 57 | * |
| 58 | * Will do nothing if \c out or \c in are \c NULL. |
| 59 | * |
| 60 | * @param[out] out The location in which the converted frames will be stored. |
| 61 | * Must have enough room for half the value of <code>frames * sizeof(float)</code>. |
| 62 | * @param[in] in The location of the frames to convert. |
| 63 | * @param[in] frames The number of frames to convert. |
| 64 | */ |
| 65 | void convert_to_mono_float_left(float *out, const float *in, size_t frames); |
| 66 | |
| 67 | RETRO_END_DECLS |
| 68 | |
| 69 | #endif |