| 1 | /*
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| 2 | * Copyright (c) 2011 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 | /** @addtogroup dplay
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| 29 | * @{
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| 30 | */
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| 31 | /**
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| 32 | * @file PCM playback audio devices
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| 33 | */
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| 34 |
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| 35 | #include <byteorder.h>
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| 36 | #include <str.h>
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| 37 | #include <errno.h>
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| 38 |
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| 39 | #include "wave.h"
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| 40 |
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| 41 | int wav_parse_header(void *file, const void **data, size_t *data_size,
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| 42 | unsigned *channels, unsigned *sampling_rate, pcm_sample_format_t *format,
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| 43 | const char **error)
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| 44 | {
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| 45 | if (!file) {
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| 46 | if (error)
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| 47 | *error = "file not present";
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| 48 | return EINVAL;
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| 49 | }
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| 50 |
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| 51 | const wave_header_t *header = file;
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| 52 | if (str_lcmp(header->chunk_id, CHUNK_ID, 4) != 0) {
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| 53 | if (error)
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| 54 | *error = "invalid chunk id";
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| 55 | return EINVAL;
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| 56 | }
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| 57 |
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| 58 | if (str_lcmp(header->format, FORMAT_STR, 4) != 0) {
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| 59 | if (error)
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| 60 | *error = "invalid format string";
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| 61 | return EINVAL;
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| 62 | }
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| 63 |
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| 64 | if (str_lcmp(header->subchunk1_id, SUBCHUNK1_ID, 4) != 0) {
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| 65 | if (error)
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| 66 | *error = "invalid subchunk1 id";
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| 67 | return EINVAL;
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| 68 | }
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| 69 |
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| 70 | if (uint16_t_le2host(header->subchunk1_size) != PCM_SUBCHUNK1_SIZE) {
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| 71 | if (error)
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| 72 | *error = "invalid subchunk1 size";
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| 73 | return EINVAL;
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| 74 | }
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| 75 |
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| 76 | if (uint16_t_le2host(header->audio_format) != FORMAT_LINEAR_PCM) {
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| 77 | if (error)
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| 78 | *error = "unknown format";
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| 79 | return ENOTSUP;
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| 80 | }
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| 81 |
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| 82 | if (str_lcmp(header->subchunk2_id, SUBCHUNK2_ID, 4) != 0) {
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| 83 | if (error)
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| 84 | *error = "invalid subchunk2 id";
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| 85 | return EINVAL;
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| 86 | }
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| 87 |
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| 88 |
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| 89 | if (data)
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| 90 | *data = header->data;
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| 91 | if (data_size)
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| 92 | *data_size = uint32_t_le2host(header->subchunk2_size);
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| 93 |
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| 94 | if (sampling_rate)
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| 95 | *sampling_rate = uint32_t_le2host(header->sampling_rate);
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| 96 | if (channels)
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| 97 | *channels = uint16_t_le2host(header->channels);
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| 98 | if (format) {
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| 99 | const unsigned size = uint32_t_le2host(header->sample_size);
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| 100 | switch (size) {
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| 101 | case 8: *format = PCM_SAMPLE_UINT8; break;
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| 102 | case 16: *format = PCM_SAMPLE_SINT16_LE; break;
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| 103 | case 24: *format = PCM_SAMPLE_SINT24_LE; break;
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| 104 | case 32: *format = PCM_SAMPLE_SINT32_LE; break;
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| 105 | default:
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| 106 | *error = "Unknown format";
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| 107 | return ENOTSUP;
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| 108 | }
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| 109 | }
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| 110 | if (error)
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| 111 | *error = "no error";
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| 112 |
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| 113 | return EOK;
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| 114 | }
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| 115 | /**
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| 116 | * @}
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| 117 | */
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