Mercurial > repos > blastem

comparison wave.c @ 407:c3abc4ada43d

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Add support for logging YM2612 channels to WAVE files
author Mike Pavone <pavone@retrodev.com>
date Sun, 16 Jun 2013 17:57:57 -0700
parents
children 140af5509ce7
comparison
equal deleted inserted replaced
406:b1bc1947d949 407:c3abc4ada43d
1 #include "wave.h"
2 #include <stddef.h>
3 #include <string.h>
4
5 int wave_init(FILE * f, uint32_t sample_rate, uint16_t bits_per_sample, uint16_t num_channels)
6 {
7 wave_header header;
8 memcpy(header.chunk.id, "RIFF", 4);
9 memcpy(header.chunk.format, "WAVE", 4);
10 header.chunk.size = 0; //This will be filled in later
11 memcpy(header.format_header.id, "fmt ", 4);
12 header.format_header.size = sizeof(wave_header) - (sizeof(header.chunk) + sizeof(header.data_header) + sizeof(header.format_header));
13 header.audio_format = 1;
14 header.num_channels = num_channels;
15 header.sample_rate = sample_rate;
16 header.byte_rate = sample_rate * num_channels * (bits_per_sample/8);
17 header.block_align = num_channels * (bits_per_sample/8);
18 header.bits_per_sample = bits_per_sample;
19 memcpy(header.data_header.id, "data", 4);
20 header.data_header.size = 0;//This will be filled in later;
21 return fwrite(&header, 1, sizeof(header), f) == sizeof(header);
22 }
23
24 int wave_finalize(FILE * f)
25 {
26 uint32_t size = ftell(f);
27 fseek(f, offsetof(wave_header, chunk.size), SEEK_SET);
28 size -= 8;
29 if (fwrite(&size, sizeof(size), 1, f) != sizeof(size)) {
30 fclose(f);
31 return 0;
32 }
33 fseek(f, offsetof(wave_header, data_header.size), SEEK_SET);
34 size -= 36;
35 if (fwrite(&size, sizeof(size), 1, f)) {
36 fclose(f);
37 return 0;
38 }
39 fclose(f);
40 return 1;
41 }