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#ifndef WAV_HPP_
#define WAV_HPP_
#include <cstdint>
#include <cstring>
#include <fstream>
#include <string>
#include <vector>
namespace wav
{
struct header {
char riff[4]; // "RIFF"
uint32_t filesize; // Total file size minus eight bytes
char wave[4]; // "WAVE"
bool valid() const {
return strncmp(riff, "RIFF", 4) == 0 && filesize > 8 && strncmp(wave, "WAVE", 4) == 0;
}
} __attribute__ ((packed));
struct format {
char fmt_[4]; // "fmt "
uint32_t size;
uint16_t type;
uint16_t channelcount;
uint32_t samplerate;
uint32_t byterate;
uint16_t unused;
uint16_t bps;
bool valid() const {
return strncmp(fmt_, "fmt ", 4) == 0;
}
} __attribute__ ((packed));
struct data {
char data[4]; // "data"
uint32_t size;
bool valid() const {
return strncmp(data, "data", 4) == 0;
}
} __attribute__ ((packed));
class clip {
public:
clip(const std::string& path) {
std::ifstream file (path);
if (!file.good())
return;
{
header h;
file.read(reinterpret_cast<char *>(&h), sizeof(header));
if (!h.valid())
return;
}
{
format f;
file.read(reinterpret_cast<char *>(&f), sizeof(format));
if (!f.valid() || f.type != 1) // ensure PCM
return;
}
{
wav::data d;
file.read(reinterpret_cast<char *>(&d), sizeof(wav::data));
if (!d.valid())
return;
m_data.resize(d.size / sizeof(int16_t));
m_next = m_data.begin();
file.read(reinterpret_cast<char *>(m_data.data()), d.size);
}
}
clip() = default;
bool valid() const {
return !m_data.empty();
}
const int16_t *data() const {
return m_data.data();
}
void next(int16_t *buf, unsigned int size) {
for (unsigned int i = 0; i < size; ++i) {
if (m_next == m_data.end())
m_next = m_data.begin();
else
*buf++ = *m_next++;
}
}
private:
std::vector<int16_t> m_data;
decltype(m_data.begin()) m_next;
};
}
#endif // WAV_HPP_
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