e8e9f79e |
1 | #if HAVE_CONFIG_H |
2 | # include "config.h" |
3 | #endif |
4 | #include <stdlib.h> |
5 | #include <string.h> |
6 | #if HAVE_STDINT_H |
7 | # include <stdint.h> |
8 | #endif |
9 | #include "pcm_reader.h" |
10 | |
11 | typedef struct pcm_sint16_converter_t { |
12 | pcm_reader_vtbl_t *vtbl; |
13 | pcm_reader_t *src; |
14 | pcm_sample_description_t format; |
15 | void *pivot; |
16 | unsigned capacity; |
17 | } pcm_sint16_converter_t; |
18 | |
19 | static inline pcm_reader_t *get_source(pcm_reader_t *reader) |
20 | { |
21 | return ((pcm_sint16_converter_t *)reader)->src; |
22 | } |
23 | |
24 | static const |
25 | pcm_sample_description_t *get_format(pcm_reader_t *reader) |
26 | { |
27 | return &((pcm_sint16_converter_t *)reader)->format; |
28 | } |
29 | |
30 | static int64_t get_length(pcm_reader_t *reader) |
31 | { |
32 | return pcm_get_length(get_source(reader)); |
33 | } |
34 | |
35 | static int64_t get_position(pcm_reader_t *reader) |
36 | { |
37 | return pcm_get_position(get_source(reader)); |
38 | } |
39 | |
40 | static int read_frames(pcm_reader_t *reader, void *buffer, unsigned nframes) |
41 | { |
42 | pcm_sint16_converter_t *self = (pcm_sint16_converter_t *)reader; |
43 | const pcm_sample_description_t *sfmt = pcm_get_format(self->src); |
44 | unsigned bytes = nframes * sfmt->bytes_per_frame; |
45 | |
46 | if (self->capacity < bytes) { |
47 | void *p = realloc(self->pivot, bytes); |
48 | if (!p) return -1; |
49 | self->pivot = p; |
50 | self->capacity = bytes; |
51 | } |
52 | nframes = pcm_read_frames(self->src, self->pivot, nframes); |
53 | if (pcm_convert_to_native_sint16(sfmt, self->pivot, nframes, buffer) < 0) |
54 | return -1; |
55 | return nframes; |
56 | } |
57 | |
58 | static void teardown(pcm_reader_t **reader) |
59 | { |
60 | pcm_sint16_converter_t *self = (pcm_sint16_converter_t *)*reader; |
61 | pcm_teardown(&self->src); |
62 | free(self->pivot); |
63 | free(self); |
64 | *reader = 0; |
65 | } |
66 | |
67 | static pcm_reader_vtbl_t my_vtable = { |
68 | get_format, get_length, get_position, read_frames, teardown |
69 | }; |
70 | |
71 | pcm_reader_t *pcm_open_sint16_converter(pcm_reader_t *reader) |
72 | { |
73 | pcm_sint16_converter_t *self = 0; |
74 | pcm_sample_description_t *fmt; |
75 | |
76 | if ((self = calloc(1, sizeof(pcm_sint16_converter_t))) == 0) |
77 | return 0; |
78 | self->src = reader; |
79 | self->vtbl = &my_vtable; |
80 | memcpy(&self->format, pcm_get_format(reader), sizeof(self->format)); |
81 | fmt = &self->format; |
82 | #if WORDS_BIGENDIAN |
83 | fmt->sample_type = PCM_TYPE_SINT_BE; |
84 | #else |
85 | fmt->sample_type = PCM_TYPE_SINT; |
86 | #endif |
87 | fmt->bits_per_channel = 16; |
88 | fmt->bytes_per_frame = 2 * fmt->channels_per_frame; |
89 | return (pcm_reader_t *)self; |
90 | } |