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1 /*
2 * Copyright (C) 2013 nu774
3 * For conditions of distribution and use, see copyright notice in COPYING
4 */
5 #ifndef LPCM_H
6 #define LPCM_H
7
8 enum pcm_type {
9 PCM_TYPE_UNKNOWN = 0,
10 PCM_TYPE_SINT = 1,
11 PCM_TYPE_UINT = 2,
12 PCM_TYPE_FLOAT = 4,
13 PCM_TYPE_SINT_BE = (8|1),
14 PCM_TYPE_UINT_BE = (8|2),
15 PCM_TYPE_FLOAT_BE = (8|4),
16 };
17
18 typedef struct pcm_sample_description_t {
19 enum pcm_type sample_type;
20 uint32_t sample_rate;
21 uint8_t bits_per_channel;
22 uint8_t bytes_per_frame;
23 uint8_t channels_per_frame;
24 uint32_t channel_mask;
25 } pcm_sample_description_t;
26
27 #define PCM_IS_SINT(desc) ((desc)->sample_type & 1)
28 #define PCM_IS_UINT(desc) ((desc)->sample_type & 2)
29 #define PCM_IS_FLOAT(desc) ((desc)->sample_type & 4)
30 #define PCM_IS_BIG_ENDIAN(desc) ((desc)->sample_type & 8)
31 #define PCM_BYTES_PER_CHANNEL(desc) \
32 ((desc)->bytes_per_frame / (desc)->channels_per_frame)
33
34 int pcm_convert_to_native_sint16(const pcm_sample_description_t *format,
35 const void *input, uint32_t nframes,
36 int16_t *result);
37 #endif
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