| 1 | /*
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| 2 | * Copyright (c) 2012 Jan Vesely
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup audio
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| 30 | * @brief HelenOS sound server
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| 31 | * @{
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| 32 | */
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| 33 | /** @file
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| 34 | */
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| 35 |
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| 36 | #include <assert.h>
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| 37 | #include <byteorder.h>
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| 38 | #include <errno.h>
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| 39 |
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| 40 | #include "audio_format.h"
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| 41 |
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| 42 | bool audio_format_same(const audio_format_t *a, const audio_format_t* b)
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| 43 | {
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| 44 | assert(a);
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| 45 | assert(b);
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| 46 | return
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| 47 | a->sampling_rate == b->sampling_rate &&
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| 48 | a->channels == b->channels &&
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| 49 | a->sample_format == b->sample_format;
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| 50 | }
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| 51 |
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| 52 | int audio_format_mix(void *dst, const void *src, size_t size, const audio_format_t *f)
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| 53 | {
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| 54 | if (!dst || !src || !f)
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| 55 | return EINVAL;
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| 56 | const size_t sample_size = pcm_sample_format_size(f->sample_format);
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| 57 | if ((size % sample_size) != 0)
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| 58 | return EINVAL;
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| 59 |
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| 60 | /* This is so ugly it eats kittens, and puppies, and ducklings,
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| 61 | * and all little fluffy things...
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| 62 | * AND it does not check for overflows (FIXME)*/
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| 63 | #define LOOP_ADD(type, endian) \
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| 64 | do { \
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| 65 | const type *src_buff = src; \
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| 66 | type *dst_buff = dst; \
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| 67 | for (size_t i = 0; i < size / sizeof(type); ++i) { \
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| 68 | const type a = type ## _ ## endian ##2host(dst_buff[i]); \
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| 69 | const type b = type ## _ ## endian ##2host(src_buff[i]); \
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| 70 | const type c = a + b; \
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| 71 | dst_buff[i] = host2 ## type ## _ ## endian(c); \
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| 72 | } \
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| 73 | } while (0)
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| 74 |
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| 75 | switch (f->sample_format) {
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| 76 | case PCM_SAMPLE_UINT8: {
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| 77 | const uint8_t *src_buff = src;
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| 78 | uint8_t *dst_buff = dst;
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| 79 | for (size_t i = 0; i < size; ++i )
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| 80 | dst_buff[i] += src_buff[i];
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| 81 | break;
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| 82 | }
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| 83 | case PCM_SAMPLE_SINT8: {
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| 84 | const int8_t *src_buff = src;
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| 85 | int8_t *dst_buff = dst;
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| 86 | for (size_t i = 0; i < size; ++i)
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| 87 | dst_buff[i] += src_buff[i];
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| 88 | break;
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| 89 | }
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| 90 | case PCM_SAMPLE_UINT16_LE:
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| 91 | case PCM_SAMPLE_SINT16_LE:
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| 92 | LOOP_ADD(uint16_t, le); break;
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| 93 | case PCM_SAMPLE_UINT16_BE:
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| 94 | case PCM_SAMPLE_SINT16_BE:
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| 95 | LOOP_ADD(uint16_t, be); break;
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| 96 | case PCM_SAMPLE_UINT24_32_LE:
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| 97 | case PCM_SAMPLE_SINT24_32_LE:
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| 98 | case PCM_SAMPLE_UINT32_LE:
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| 99 | case PCM_SAMPLE_SINT32_LE:
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| 100 | LOOP_ADD(uint32_t, le); break;
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| 101 | case PCM_SAMPLE_UINT24_32_BE:
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| 102 | case PCM_SAMPLE_SINT24_32_BE:
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| 103 | case PCM_SAMPLE_UINT32_BE:
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| 104 | case PCM_SAMPLE_SINT32_BE:
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| 105 | LOOP_ADD(uint32_t, be); break;
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| 106 | case PCM_SAMPLE_UINT24_LE:
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| 107 | case PCM_SAMPLE_SINT24_LE:
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| 108 | case PCM_SAMPLE_UINT24_BE:
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| 109 | case PCM_SAMPLE_SINT24_BE:
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| 110 | case PCM_SAMPLE_FLOAT32:
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| 111 | default:
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| 112 | return ENOTSUP;
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| 113 | }
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| 114 | return EOK;
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| 115 | }
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| 116 |
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| 117 | /**
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| 118 | * @}
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| 119 | */
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