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#include <cmath>
#include <cstdint>
#include <cstddef>
#include <sstream>
#include "utils.h"
#include <unistd.h>
#define MIN(a,b) (((a)<(b))?(a):(b))
#define MAX(a,b) (((a)>(b))?(a):(b))
/* Taken from sox */
const char* level(int channel, int peak)
{
static char const * const text[][2] = {
/* White: 2dB steps */
{"", ""}, {"-", "-"}, {"=", "="}, {"-=", "=-"},
{"==", "=="}, {"-==", "==-"}, {"===", "==="}, {"-===", "===-"},
{"====", "===="}, {"-====", "====-"}, {"=====", "====="},
{"-=====", "=====-"}, {"======", "======"},
/* Red: 1dB steps */
{"!=====", "=====!"},
};
int const red = 1, white = NUMOF(text) - red;
double linear = ((double)peak) / INT16_MAX;
int vu_dB = linear ? floor(2 * white + red + linear_to_dB(linear)) : 0;
int index = vu_dB < 2 * white ?
MAX(vu_dB / 2, 0) :
MIN(vu_dB - white, red + white - 1);
return text[index][channel];
}
size_t strlen_utf8(const char *s) {
size_t result = 0;
// ignore continuation bytes - only count single/leading bytes
while (*s)
if ((*s++ & 0xC0) != 0x80)
result++;
return result;
}
static const std::string ICY_TEXT_SEPARATOR = " - ";
bool write_icy_to_file(const ICY_TEXT_t text, const std::string& filename, bool dl_plus)
{
FILE* fd = fopen(filename.c_str(), "wb");
if (fd) {
bool ret = true;
bool artist_title_used = !text.artist.empty() and !text.title.empty();
// if desired, prepend DL Plus information
if (dl_plus) {
std::stringstream ss;
ss << "##### parameters { #####\n";
ss << "DL_PLUS=1\n";
// if non-empty text, add tag
if (artist_title_used) {
size_t artist_len = strlen_utf8(text.artist.c_str());
size_t title_start = artist_len + strlen_utf8(ICY_TEXT_SEPARATOR.c_str());
// ITEM.ARTIST
ss << "DL_PLUS_TAG=4 0 " << (artist_len - 1) << "\n"; // -1 !
// ITEM.TITLE
ss << "DL_PLUS_TAG=1 " << title_start << " " << (strlen_utf8(text.title.c_str()) - 1) << "\n"; // -1 !
} else if (!text.now_playing.empty()) {
// PROGRAMME.NOW
ss << "DL_PLUS_TAG=33 0 " << (strlen_utf8(text.now_playing.c_str()) - 1) << "\n"; // -1 !
}
ss << "##### parameters } #####\n";
ret &= fputs(ss.str().c_str(), fd) >= 0;
}
if (artist_title_used) {
ret &= fputs(text.artist.c_str(), fd) >= 0;
ret &= fputs(ICY_TEXT_SEPARATOR.c_str(), fd) >= 0;
ret &= fputs(text.title.c_str(), fd) >= 0;
}
else {
ret &= fputs(text.now_playing.c_str(), fd) >= 0;
}
fclose(fd);
return ret;
}
return false;
}
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