source: abuse/trunk/src/imlib/readwav.cpp @ 534

Last change on this file since 534 was 534, checked in by Sam Hocevar, 11 years ago

imlib: remove a lot of dead code, especially from the linked list and
the WAV reader.

File size: 2.5 KB
Line 
1/*
2 *  Abuse - dark 2D side-scrolling platform game
3 *  Copyright (c) 1995 Crack dot Com
4 *  Copyright (c) 2005-2011 Sam Hocevar <sam@hocevar.net>
5 *
6 *  This software was released into the Public Domain. As with most public
7 *  domain software, no warranty is made or implied by Crack dot Com or
8 *  Jonathan Clark.
9 */
10
11#include "config.h"
12
13#include "common.h"
14
15#include "readwav.h"
16#include "specs.h"
17#include "dprint.h"
18
19struct wav_chunk
20{
21    char id[4];
22    uint32_t size;
23    char type[4];
24};
25
26struct wav_tag
27{
28    char id[4];
29    uint32_t size;
30};
31
32
33struct wav_format
34{
35    uint16_t fmt_tag, channels;
36    uint32_t samplesps, avg_bytesps;
37    uint16_t align;
38};
39
40struct pcm_wave
41{
42    wav_format wf;
43    uint16_t bitsps;
44};
45
46static void read_chunk(wav_chunk &chunk, bFILE *fp)
47{
48    fp->read(&chunk.id, 4);
49    chunk.size = fp->read_uint32();
50    fp->read(&chunk.type, 4);
51}
52
53static void read_tag(wav_tag &tag, bFILE *fp)
54{
55    fp->read(&tag.id, 4);
56    tag.size = fp->read_uint32();
57}
58
59static void read_pcm(pcm_wave &pcm, bFILE *fp)
60{
61    pcm.wf.fmt_tag = fp->read_uint16();
62    pcm.wf.channels = fp->read_uint16();
63    pcm.wf.samplesps = fp->read_uint32();
64    pcm.wf.avg_bytesps = fp->read_uint32();
65    pcm.wf.align = fp->read_uint16();
66    pcm.bitsps = fp->read_uint16();
67}
68
69uint8_t *read_wav(char const *filename, int &sample_rate, int &data_size)
70{
71    bFILE *fp = open_file(filename, "rb");
72    if (fp->open_failure())
73    {
74        delete fp;
75        return NULL;
76    }
77
78    wav_chunk chunk;
79    read_chunk(chunk, fp);
80    if (memcmp(chunk.type, "WAVE", 4) != 0)
81    {
82        printf("Bad WAV file (chunk) %s\n", filename);
83        delete fp;
84        return NULL;
85    }
86
87    wav_tag tag;
88    read_tag(tag, fp);
89    if (memcmp(tag.id, "fmt ", 4) != 0)
90    {
91        printf( "fmt tag missing, bad file (%s)\n", filename);
92        delete fp;
93        return NULL;
94    }
95
96    pcm_wave pcm;
97    read_pcm(pcm, fp);
98
99    fp->seek(tag.size - 16, SEEK_CUR);  // seek to offset of sample
100
101    read_tag(tag, fp);
102
103    if (memcmp(tag.id, "data", 4) != 0)
104    {
105        printf("Bad Wav file (tag), %s\n", filename);
106        delete fp;
107        return NULL;
108    }
109
110    data_size = tag.size;
111    uint8_t *ret = (uint8_t *)malloc(tag.size);
112    ERROR(ret, "Malloc error");
113
114    sample_rate = pcm.wf.samplesps;
115    ERROR((unsigned int)fp->read(ret, tag.size) == tag.size, "Premature end of file");
116    ERROR(pcm.bitsps == 8, "Only 8-bit samples supported");
117    ERROR(pcm.wf.channels == 1, "Only mono samples supported");
118    ERROR(pcm.wf.align == 1, "Bad block alignment");
119    delete fp;
120    return ret;
121}
122
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