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#pragma once
#include "common.h"
#include "smrt_arena.h"
#include <stdio.h>
typedef struct {
u64 sample_count;
u8 * samples;
} wav_data_t;
// [Master RIFF chunk]
// FileTypeBlocID (4 bytes) : Identifier « RIFF » (0x52, 0x49, 0x46, 0x46)
// FileSize (4 bytes) : Overall file size minus 8 bytes
// FileFormatID (4 bytes) : Format = « WAVE » (0x57, 0x41, 0x56, 0x45)
#pragma pack(push, 1)
typedef struct {
u8 chunk_id[4];
u32 file_size;
u8 file_format_id[4];
} wav_master_chunk_t;
// [Chunk describing the data format]
// FormatBlocID (4 bytes) : Identifier « fmt␣ » (0x66, 0x6D, 0x74, 0x20)
// BlocSize (4 bytes) : Chunk size minus 8 bytes
// AudioFormat (2 bytes) : Audio format (1: PCM integer, 3: IEEE 754 float)
// NbrChannels (2 bytes) : Number of channels
// Frequency (4 bytes) : Sample rate (in hertz)
// BytePerSec (4 bytes) : Number of bytes to read per second (Frequency * BytePerBloc).
// BytePerBloc (2 bytes) : Number of bytes per block (NbrChannels * BitsPerSample / 8).
// BitsPerSample (2 bytes) : Number of bits per sample
typedef struct {
u8 chunk_id[4];
u32 chunk_size;
u16 audio_format;
u16 num_channels;
u32 sample_rate;
u32 bytes_per_sec;
u16 bytes_per_block;
u16 bits_per_sample;
} wav_fmt_chunk_t;
#pragma pack(pop)
/// Load WAV data from wav_file. Data will be allocated on arena
wav_data_t load_wav_file(smrt_arena_t * arena ,
FILE *wav_file ,
wav_master_chunk_t *master_o ,
wav_fmt_chunk_t *format_o);
/// Write WAV headers and data to wav_file.
b32 write_wav_file(FILE * wav_file ,
wav_fmt_chunk_t *fmt_chunk_i ,
wav_data_t data_i);
/// Generate WAV "fmt " chunk for unsigned 8-bit PCM data ready to be written to a file.
wav_fmt_chunk_t make_wav_fmt_chunk(u32 num_channels ,
u32 sample_rate ,
u16 bits_per_sample);
/// Load WAV data into [-1.0, 1.0] f64 amplitudes. Populates -o inputs with information.
/// samples will be amplitude data for each channel from the WAV file, of length sample_count.
void wav_load(smrt_arena_t *arena, FILE *wav, f64 *** samples_o ,
u16 *channel_count_o ,
u64 * sample_count_o ,
u32 * sample_rate_o ,
smrt_arena_t **conflicts, u64 num_conflicts );
f64 * read_8bps_data(smrt_arena_t *arena, wav_data_t data, u16 num_channels, u16 channel);
f64 * read_16bps_data(smrt_arena_t *arena, wav_data_t data, u16 num_channels, u16 channel);
f64 * read_24bps_data(smrt_arena_t *arena, wav_data_t data, u16 num_channels, u16 channel);
f64 *read_32bps_float_data(smrt_arena_t *arena, wav_data_t data, u16 num_channels, u16 channel);
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