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* Copyright (C) 2022 BlueKitchen GmbH
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// *****************************************************************************
//
// LC3 decoder EHIMA
//
// *****************************************************************************
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include "wav_util.h"
#include "btstack_util.h"
#include "btstack_debug.h"
#include "btstack_lc3.h"
#include "btstack_lc3_google.h"
#define MAX_NUM_CHANNELS 2
#define MAX_SAMPLES_PER_FRAME 480
static uint8_t write_buffer[200];
static int16_t samples_buffer[MAX_SAMPLES_PER_FRAME + MAX_NUM_CHANNELS];
static uint32_t frame_count = 0;
static void show_usage(const char * path){
printf("Usage: %s input.wav output.lc3 frame_duration_ms octets_per_frame\n", path);
printf("- frame_duration_ms: 7.5 or 10\n");
printf("- octects_per_frame: 26..155\n");
printf("\n\n");
}
int main (int argc, const char * argv[]){
if (argc < 4){
show_usage(argv[0]);
return -1;
}
uint8_t argv_pos = 1;
const char * wav_filename = argv[argv_pos++];
const char * lc3_filename = argv[argv_pos++];
btstack_lc3_frame_duration_t frame_duration;
if (strcmp(argv[argv_pos], "10") == 0){
frame_duration = BTSTACK_LC3_FRAME_DURATION_10000US;
} else if (strcmp(argv[argv_pos], "7.5") == 0){
frame_duration = BTSTACK_LC3_FRAME_DURATION_7500US;
} else {
printf("Invalid frame duration %s, must be either 7.5 or 10\n", argv[2]);
return -10;
}
argv_pos++;
uint16_t bytes_per_frame = atoi(argv[argv_pos++]);
if ((bytes_per_frame < 26) || (bytes_per_frame > 155)){
printf("Octets per Frame %u out of range [26..155]\n", bytes_per_frame);
return -10;
}
int status = wav_reader_open(wav_filename);
if (status != 0){
printf("Could not open wav file %s\n", wav_filename);
return -10;
}
// get wav config
uint32_t sampling_frequency_hz = wav_reader_get_sampling_rate();
uint8_t num_channels = wav_reader_get_num_channels();
uint16_t number_samples_per_frame = btstack_lc3_samples_per_frame(sampling_frequency_hz, frame_duration);
// init decoder
uint8_t channel;
btstack_lc3_encoder_google_t encoder_contexts[MAX_NUM_CHANNELS];
const btstack_lc3_encoder_t * lc3_encoder;
for (channel = 0 ; channel < num_channels ; channel++){
btstack_lc3_encoder_google_t * encoder_context = &encoder_contexts[channel];
lc3_encoder = btstack_lc3_encoder_google_init_instance(encoder_context);
lc3_encoder->configure(encoder_context, sampling_frequency_hz, frame_duration, number_samples_per_frame);
}
if (number_samples_per_frame > MAX_SAMPLES_PER_FRAME) return -10;
// calc bitrate from num octets
uint32_t bitrate_per_channel = ((uint32_t) bytes_per_frame * 80000) / (btstack_lc3_frame_duration_in_us(frame_duration) / 100);
// fix bitrate for 8_1
if ((sampling_frequency_hz == 8000) && (frame_duration == BTSTACK_LC3_FRAME_DURATION_7500US)) {
bitrate_per_channel = 27734;
}
// fix bitrate for 441_1 and 441_2
if (sampling_frequency_hz == 44100){
switch(frame_duration){
case BTSTACK_LC3_FRAME_DURATION_7500US:
bitrate_per_channel = 95060;
break;
case BTSTACK_LC3_FRAME_DURATION_10000US:
bitrate_per_channel = 95500;
break;
default:
btstack_unreachable();
break;
}
}
uint32_t bitrate = bitrate_per_channel * num_channels;
// create lc3 file and write header for floating point implementation
FILE * lc3_file = fopen(lc3_filename, "wb");
if (!lc3_file) return 1;
uint16_t frame_duration_100us = (frame_duration == BTSTACK_LC3_FRAME_DURATION_10000US) ? 100 : 75;
uint8_t header[18];
little_endian_store_16(header, 0, 0xcc1c);
little_endian_store_16(header, 2, sizeof(header));
little_endian_store_16(header, 4, sampling_frequency_hz / 100);
little_endian_store_16(header, 6, bitrate / 100);
little_endian_store_16(header, 8, num_channels);
little_endian_store_16(header, 10, frame_duration_100us * 10);
little_endian_store_16(header, 12, 0);
little_endian_store_32(header, 14, 0); // num samples need to set later
fwrite(header, 1, sizeof(header), lc3_file);
// print format
printf("WAC file: %s\n", wav_filename);
printf("LC3 file: %s\n", lc3_filename);
printf("Samplerate: %u Hz\n", sampling_frequency_hz);
printf("Channels: %u\n", num_channels);
printf("Frame duration: %s ms\n", (frame_duration == BTSTACK_LC3_FRAME_DURATION_10000US) ? "10" : "7.5");
printf("Bitrate: %u\n", bitrate);
printf("Samples per Frame: %u\n", number_samples_per_frame);
while (true){
// process file frame by frame
memset(samples_buffer, 0, sizeof(samples_buffer));
// read samples per frame * num channels
status = wav_reader_read_int16(number_samples_per_frame * num_channels, samples_buffer);
if (status != 0) break;
// write len of complete frame
uint8_t len[2];
little_endian_store_16(len, 0, num_channels * bytes_per_frame);
fwrite(len, 1, sizeof(len), lc3_file);
// encode frame by frame
for (channel = 0; channel < num_channels ; channel++){
status = lc3_encoder->encode_signed_16(&encoder_contexts[channel], &samples_buffer[channel], num_channels, write_buffer);
if (status != ERROR_CODE_SUCCESS){
printf("Error %u\n", status);
break;
}
fwrite(write_buffer, 1, bytes_per_frame, lc3_file);
}
if (status != 0) break;
frame_count++;
}
uint32_t total_samples = frame_count * number_samples_per_frame;
printf("Total samples: %u\n", total_samples);
// rewind and store num samples
little_endian_store_32(header, 14, total_samples); // num samples need to set later
rewind(lc3_file);
fwrite(header, 1, sizeof(header), lc3_file);
fclose(lc3_file);
}