]> iEval git - fdkaac.git/blame - src/pcm_sint16_converter.c
fix help message: show -I as shorthand for --ignorelength
[fdkaac.git] / src / pcm_sint16_converter.c
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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
11typedef 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
19static inline pcm_reader_t *get_source(pcm_reader_t *reader)
20{
21 return ((pcm_sint16_converter_t *)reader)->src;
22}
23
24static const
25pcm_sample_description_t *get_format(pcm_reader_t *reader)
26{
27 return &((pcm_sint16_converter_t *)reader)->format;
28}
29
30static int64_t get_length(pcm_reader_t *reader)
31{
32 return pcm_get_length(get_source(reader));
33}
34
35static int64_t get_position(pcm_reader_t *reader)
36{
37 return pcm_get_position(get_source(reader));
38}
39
40static 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
58static 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
67static pcm_reader_vtbl_t my_vtable = {
68 get_format, get_length, get_position, read_frames, teardown
69};
70
71pcm_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}
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