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1 | /* |
2 | * Copyright (C) 2013 nu774 |
3 | * For conditions of distribution and use, see copyright notice in COPYING |
4 | */ |
e8e9f79e |
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_sint16_converter_t { |
16 | pcm_reader_vtbl_t *vtbl; |
17 | pcm_reader_t *src; |
18 | pcm_sample_description_t format; |
19 | void *pivot; |
20 | unsigned capacity; |
21 | } pcm_sint16_converter_t; |
22 | |
23 | static inline pcm_reader_t *get_source(pcm_reader_t *reader) |
24 | { |
25 | return ((pcm_sint16_converter_t *)reader)->src; |
26 | } |
27 | |
28 | static const |
29 | pcm_sample_description_t *get_format(pcm_reader_t *reader) |
30 | { |
31 | return &((pcm_sint16_converter_t *)reader)->format; |
32 | } |
33 | |
34 | static int64_t get_length(pcm_reader_t *reader) |
35 | { |
36 | return pcm_get_length(get_source(reader)); |
37 | } |
38 | |
39 | static int64_t get_position(pcm_reader_t *reader) |
40 | { |
41 | return pcm_get_position(get_source(reader)); |
42 | } |
43 | |
44 | static int read_frames(pcm_reader_t *reader, void *buffer, unsigned nframes) |
45 | { |
46 | pcm_sint16_converter_t *self = (pcm_sint16_converter_t *)reader; |
47 | const pcm_sample_description_t *sfmt = pcm_get_format(self->src); |
48 | unsigned bytes = nframes * sfmt->bytes_per_frame; |
49 | |
50 | if (self->capacity < bytes) { |
51 | void *p = realloc(self->pivot, bytes); |
52 | if (!p) return -1; |
53 | self->pivot = p; |
54 | self->capacity = bytes; |
55 | } |
56 | nframes = pcm_read_frames(self->src, self->pivot, nframes); |
57 | if (pcm_convert_to_native_sint16(sfmt, self->pivot, nframes, buffer) < 0) |
58 | return -1; |
59 | return nframes; |
60 | } |
61 | |
62 | static void teardown(pcm_reader_t **reader) |
63 | { |
64 | pcm_sint16_converter_t *self = (pcm_sint16_converter_t *)*reader; |
65 | pcm_teardown(&self->src); |
66 | free(self->pivot); |
67 | free(self); |
68 | *reader = 0; |
69 | } |
70 | |
71 | static pcm_reader_vtbl_t my_vtable = { |
72 | get_format, get_length, get_position, read_frames, teardown |
73 | }; |
74 | |
75 | pcm_reader_t *pcm_open_sint16_converter(pcm_reader_t *reader) |
76 | { |
77 | pcm_sint16_converter_t *self = 0; |
78 | pcm_sample_description_t *fmt; |
79 | |
80 | if ((self = calloc(1, sizeof(pcm_sint16_converter_t))) == 0) |
81 | return 0; |
82 | self->src = reader; |
83 | self->vtbl = &my_vtable; |
84 | memcpy(&self->format, pcm_get_format(reader), sizeof(self->format)); |
85 | fmt = &self->format; |
86 | #if WORDS_BIGENDIAN |
87 | fmt->sample_type = PCM_TYPE_SINT_BE; |
88 | #else |
89 | fmt->sample_type = PCM_TYPE_SINT; |
90 | #endif |
91 | fmt->bits_per_channel = 16; |
92 | fmt->bytes_per_frame = 2 * fmt->channels_per_frame; |
93 | return (pcm_reader_t *)self; |
94 | } |