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Commit | Line | Data |
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a7e00a42 | 1 | /* |
2 | * Copyright (C) 2013 nu774 | |
3 | * For conditions of distribution and use, see copyright notice in COPYING | |
4 | */ | |
5 | #if HAVE_CONFIG_H | |
6 | # include "config.h" | |
7 | #endif | |
8 | #include <stdlib.h> | |
9 | #include <string.h> | |
10 | #if HAVE_STDINT_H | |
11 | # include <stdint.h> | |
12 | #endif | |
13 | #include "pcm_reader.h" | |
14 | ||
15 | typedef struct pcm_float_converter_t { | |
16 | pcm_reader_vtbl_t *vtbl; | |
17 | pcm_reader_t *src; | |
18 | pcm_sample_description_t format; | |
19 | } pcm_float_converter_t; | |
20 | ||
21 | static inline pcm_reader_t *get_source(pcm_reader_t *reader) | |
22 | { | |
23 | return ((pcm_float_converter_t *)reader)->src; | |
24 | } | |
25 | ||
26 | static const | |
27 | pcm_sample_description_t *get_format(pcm_reader_t *reader) | |
28 | { | |
29 | return &((pcm_float_converter_t *)reader)->format; | |
30 | } | |
31 | ||
32 | static int64_t get_length(pcm_reader_t *reader) | |
33 | { | |
34 | return pcm_get_length(get_source(reader)); | |
35 | } | |
36 | ||
37 | static int64_t get_position(pcm_reader_t *reader) | |
38 | { | |
39 | return pcm_get_position(get_source(reader)); | |
40 | } | |
41 | ||
42 | static int read_frames(pcm_reader_t *reader, void *buffer, unsigned nframes) | |
43 | { | |
44 | unsigned i; | |
45 | pcm_float_converter_t *self = (pcm_float_converter_t *)reader; | |
46 | const pcm_sample_description_t *sfmt = pcm_get_format(self->src); | |
47 | nframes = pcm_read_frames(self->src, buffer, nframes); | |
48 | if (!(sfmt->sample_type & PCM_TYPE_FLOAT)) { | |
49 | int32_t *ip = buffer; | |
50 | float *op = buffer; | |
51 | unsigned i, count = nframes * sfmt->channels_per_frame; | |
52 | for (i = 0; i < count; ++i) | |
53 | op[i] = ip[i] / 2147483648.0f; | |
54 | } | |
55 | return nframes; | |
56 | } | |
57 | ||
58 | static void teardown(pcm_reader_t **reader) | |
59 | { | |
60 | pcm_float_converter_t *self = (pcm_float_converter_t *)*reader; | |
61 | pcm_teardown(&self->src); | |
62 | free(self); | |
63 | *reader = 0; | |
64 | } | |
65 | ||
66 | static pcm_reader_vtbl_t my_vtable = { | |
67 | get_format, get_length, get_position, read_frames, teardown | |
68 | }; | |
69 | ||
70 | pcm_reader_t *pcm_open_float_converter(pcm_reader_t *reader) | |
71 | { | |
72 | pcm_float_converter_t *self = 0; | |
73 | pcm_sample_description_t *fmt; | |
74 | ||
75 | if ((self = calloc(1, sizeof(pcm_float_converter_t))) == 0) | |
76 | return 0; | |
77 | self->src = reader; | |
78 | self->vtbl = &my_vtable; | |
79 | memcpy(&self->format, pcm_get_format(reader), sizeof(self->format)); | |
80 | fmt = &self->format; | |
81 | fmt->bits_per_channel = 32; | |
82 | fmt->sample_type = PCM_TYPE_FLOAT; | |
83 | fmt->bytes_per_frame = 4 * fmt->channels_per_frame; | |
84 | return (pcm_reader_t *)self; | |
85 | } |