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Extend tools/pcm.c to allow decoding .pcm to .wav

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Fixes #79
This commit is contained in:
Rangi42 2023-11-20 23:59:35 -05:00
parent 298e99d377
commit 1fb52c0e49
1 changed files with 68 additions and 9 deletions
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77
tools/pcm.c
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@ -1,10 +1,34 @@
#define PROGRAM_NAME "pcm"
#define USAGE_OPTS "infile.wav outfile.pcm"
#define USAGE_OPTS "[-d|--decompress] [-h|--help] infile.wav outfile.pcm"
#include "common.h"
#define CHUNKID(b1, b2, b3, b4) (uint32_t)((uint32_t)(b1) | ((uint32_t)(b2) << 8) | ((uint32_t)(b3) << 16) | ((uint32_t)(b4) << 24))
#define LE16(n) (uint8_t)((n) & 0xff), (uint8_t)(((n) & 0xff00) >> 8)
#define LE32(n) (uint8_t)((n) & 0xff), (uint8_t)(((n) & 0xff00) >> 8), \
(uint8_t)(((n) & 0xff0000) >> 16), (uint8_t)(((n) & 0xff000000) >> 24)
void parse_args(int argc, char *argv[], bool *decompress) {
struct option long_options[] = {
{"decompress", no_argument, 0, 'd'},
{"help", no_argument, 0, 'h'},
{0}
};
for (int opt; (opt = getopt_long(argc, argv, "dh", long_options)) != -1;) {
switch (opt) {
case 'd':
*decompress = true;
break;
case 'h':
usage_exit(0);
break;
default:
usage_exit(1);
}
}
}
int32_t get_uint16le(uint8_t *data, long size, long i) {
return i + 2 < size ? (int32_t)data[i] | ((int32_t)data[i + 1] << 8) : -1;
}
@ -82,18 +106,53 @@ uint8_t *wav2pcm(uint8_t *wavdata, long wavsize, size_t *pcmsize) {
return pcmdata;
}
uint8_t *pcm2wav(uint8_t *pcmdata, long pcmsize, size_t *wavsize) {
size_t num_samples = pcmsize * 8;
*wavsize = 44 + num_samples;
uint8_t *wavdata = xmalloc(*wavsize);
uint8_t header[44] = {
'R', 'I', 'F', 'F', // chunk ID "RIFF"
LE32(*wavsize - 8), // chunk size
'W', 'A', 'V', 'E', // format "WAVE"
'f', 'm', 't', ' ', // subchunk ID "fmt "
LE32(16), // subchunk size
LE16(1), // audio format
LE16(1), // num channels
LE32(22050), // sample rate
LE32(22050), // byte rate
LE16(1), // block align
LE16(8), // bits per sample
'd', 'a', 't', 'a', // subchunk ID "data"
LE32(num_samples) // subchunk size
};
memcpy(wavdata, header, sizeof(header));
for (size_t i = 0; i < num_samples; i++) {
uint8_t bit = pcmdata[i / 8] & (1 << (7 - i % 8));
wavdata[sizeof(header) + i] = bit ? 0xff : 0x00;
}
return wavdata;
}
int main(int argc, char *argv[]) {
if (argc != 3) {
bool decompress = false;
parse_args(argc, argv, &decompress);
argc -= optind;
argv += optind;
if (argc != 2) {
usage_exit(1);
}
long wavsize;
uint8_t *wavdata = read_u8(argv[1], &wavsize);
size_t pcmsize;
uint8_t *pcmdata = wav2pcm(wavdata, wavsize, &pcmsize);
write_u8(argv[2], pcmdata, pcmsize);
long in_size;
uint8_t *in_data = read_u8(argv[0], &in_size);
size_t out_size;
uint8_t *out_data = (decompress ? pcm2wav : wav2pcm)(in_data, in_size, &out_size);
write_u8(argv[1], out_data, out_size);
free(wavdata);
free(pcmdata);
free(in_data);
free(out_data);
return 0;
}