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#include <al/log.h>
#include <al/math.h>
#include "waveform.h"
#define WITHIN_RMS(low, high, rms) \
((low >= 0 && low <= rms) || (high < 0 && high >= -rms) || (low < 0 && high > 0 && rms > 0))
//#define OUTPUT_WAVEFORM_PNG
//#define WAVEFORM_REFERENCE_MODE
#ifdef OUTPUT_WAVEFORM_PNG
#include <nnwt/file.h>
#include <nnwt/net.h>
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include <stb_image_write.h>
// min/max: #BC615E, #F4EAE0
// rms: #FF928F, #E4CAAF
//
// min/max: #D93A50, #b22f41
// rms: #f44f7a, #c84064
// extra: #f6ac7f, #F5F4FA, #5b524b
// left channel: n == 0, right channel: n == 1.
#define COLOR_FOR_PIXEL(n, rms) rms ? \
n == 0 ? nn_htonl(0xe4caaf99) : nn_htonl(0xff928fff) : \
n == 0 ? nn_htonl(0xf4eae099) : nn_htonl(0xbc615eff)
// ss: current sample, ns: next sample.
#define HIT_WAVE(low, high, ss, ns) \
((ss <= low && ns > low) || (ss > high && ns <= high) || (ss > low && ns <= high))
static void test_write_bitmap(struct cmc_list_entry *entry, u32 width, u32 height, u32 **rgba)
{
f64 start = nn_get_tick();
*rgba = al_calloc(width * height, 4);
u32 channels = entry->raw.fmt.channel_count;
u32 samples_per_column = entry->raw.sample_count / width;
s32 wave_min = INT16_MIN;
s32 wave_max = INT16_MAX;
s32 step = (wave_max * 2 + (height - 1)) / height;
//s32 step = (wave_max * 2 + (height / 2)) / height;
s16 *steps = al_malloc(sizeof(s16) * (height + 1));
for (s32 i = 0; i <= (s32)height; i++) {
steps[i] = (s16)MAX(wave_max - step * i, wave_min);
}
//steps[height] = wave_min;
al_assert(steps[height] == wave_min);
s64 rms = 0;
s16 min, max;
s16 low, high;
s16 *data = (s16 *)entry->raw.data;
const u32 samples_stride = samples_per_column * channels;
for (u32 i = 0; i < width; i++) {
u32 f = i * samples_stride;
for (u32 n = 0; n < channels; n++) {
rms = 0;
min = wave_max, max = wave_min;
for (u32 m = 0; m <= samples_stride; m += channels) {
s16 ss = data[f + m + n];
rms += ss * ss;
min = MIN(min, ss);
max = MAX(max, ss);
}
rms /= samples_per_column;
rms = sqrt(rms);
#ifndef WAVEFORM_REFERENCE_MODE
for (u32 j = 0; j < height; j++) {
low = steps[j + 1], high = steps[j];
if (low < max && high >= min) {
(*rgba)[j * width + i] = COLOR_FOR_PIXEL(n, WITHIN_RMS(low, high, rms));
}
}
#else
for (u32 m = 0; m < samples_stride; m += channels) {
s16 ss = data[f + m + n];
s16 ns = data[f + m + n + channels];
for (u32 j = 0; j < height; j++) {
low = steps[j + 1], high = steps[j];
if (HIT_WAVE(low, high, ss, ns)) {
(*rgba)[j * width + i] = COLOR_FOR_PIXEL(n, WITHIN_RMS(low, high, rms));
}
}
}
#endif
}
}
log_info("generating waveform took: %.2fs.", nn_get_tick() - start);
//stbi_write_png("./waveform.png", width, height, 4, *rgba, width * 4);
/*
struct nn_file file;
nn_file_open(&file, &al_str_c("./raw_samples.raw"), NNWT_FILE_CREATE);
size_t bytes = entry->raw.sample_count * entry->raw.fmt.channel_count * camu_audio_format_bytes_per_sample(&entry->raw.fmt);
nn_file_write(&file, entry->raw.data, bytes);
nn_file_close(&file);
*/
}
#endif
/*
static const char *octant_lut[] = {
" ", "", "", "🮂", "", "▘", "", "", "", "", "▝", "", "", "", "", "▀",
"", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "🮅",
"", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
"▖", "", "", "", "", "▌", "", "", "", "", "▞", "", "", "", "", "▛",
"", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
"▗", "", "", "", "", "▚", "", "", "", "", "▐", "", "", "", "", "▜",
"", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
"▂", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
"▄", "", "", "", "", "▙", "", "", "", "", "▟", "", "▆", "", "", "█"
};
*/
#define RMS_BIT (1 << 8)
void cmc_draw_waveform(struct cmc_list_entry *entry, u32 width, u32 height, bool include_rms, char ***buf, u32 **rgba)
{
(void)include_rms;
(void)buf;
(void)entry;
(void)width;
(void)height;
(void)rgba;
#ifdef OUTPUT_WAVEFORM_PNG
test_write_bitmap(entry, width, height, rgba);
return;
#endif
// u32 channels = entry->raw.fmt.channel_count;
// u32 samples_per_column = entry->raw.sample_count / (width * 2);
//
// s32 pixel_height = height * 4;
// s32 wave_min = INT16_MIN;
// s32 wave_max = INT16_MAX;
// s32 step = (wave_max * 2 + (pixel_height - 1)) / pixel_height;
//
// s16 *steps = al_malloc(sizeof(s16) * (pixel_height + 1));
// for (s32 i = 0; i <= (s32)pixel_height; i++) {
// steps[i] = (s16)MAX(wave_max - step * i, wave_min);
// }
// al_assert(steps[pixel_height] == wave_min);
//
// s64 rms = 0;
// s16 min, max;
// s16 low, high;
// s16 *data = (s16 *)entry->raw.data;
// const u32 samples_stride = samples_per_column * channels;
// u16 masks_for_chars[height];
// //u32 slen[height];
// //al_memset(slen, 0, sizeof(u32) * height);
// for (u32 i = 0; i < width; i++) {
// al_memset(masks_for_chars, 0, sizeof(u16) * height);
// for (u32 k = 0; k < 2; k++) {
// u32 f = (i * 2 + k) * samples_stride;
// for (u32 n = 0; n < channels; n++) {
// rms = 0;
// min = wave_max, max = wave_min;
// for (u32 m = 0; m <= samples_stride; m += channels) {
// s16 ss = data[f + m + n];
// rms += ss * ss;
// min = MIN(min, ss);
// max = MAX(max, ss);
// }
// rms /= samples_per_column;
// rms = sqrt(rms);
// for (u32 j = 0; j < height; j++) {
// for (u32 l = 0; l < 4; l++) {
// u32 step = j * 4 + l;
// low = steps[step + 1], high = steps[step];
// if (low < max && high >= min) {
// if (include_rms && WITHIN_RMS(low, high, rms)) {
// masks_for_chars[j] |= RMS_BIT;
// } else {
// masks_for_chars[j] |= 1 << (l * 2 + k);
// }
// }
// }
// }
// }
// }
// for (u32 j = 0; j < height; j++) {
// if (masks_for_chars[j] & RMS_BIT) {
// buf[j][i][0] = 'R';
// masks_for_chars[j] &= ~RMS_BIT;
// }
// u32 len = (masks_for_chars[j] == 0) ? 2 : 5;
// al_memcpy(buf[j][i] + 1, octant_lut[masks_for_chars[j]], len);
// //slen[j] += len;
// }
// }
//
// /*
// for (u32 j = 0; j < height; j++) {
// buf[j][slen[j]] = '\0';
// }
// */
}
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