added cool markovy visualiser

ampler.c

@@ -30,7 +30,8 @@ Ampler_state *init() {
 		puts(SDL_GetError());
 
 	// TODO: iterate a directory to load samples
-	load_track(state);
+	load_sample(state, "loop2.wav");
+	load_sample(state, "chord.wav");
 
 	puts("init.");
 	return state;

ampler.h

@@ -24,6 +24,7 @@ typedef double f64;
 #define do )
 
 #define or ||
+#define and &&
 
 
 #define arraylen(a) (sizeof (a) / sizeof ((a)[0]))
@@ -45,6 +46,8 @@ struct Sound_src {
 	f32 speed; // in samples, per sample, can be negative
 	s32 start; // play start in samples
 	s32 end; // play end in samples
+	s8 name[32]; // includes null terminator
+	f32 note_speed; // multiplies with base speed, CANNOT be negative
 	enum { SND_FREE = 0, SND_STOPPED, SND_PLAYING, SND_LOOPING, } state;
 };
 
@@ -61,6 +64,7 @@ struct Ampler_state {
 	Sound_src sounds[64];
 	s32 played_audio_last_frame;
 	Udp_msg messages[64];
+	s8 frame_mix[CHANNELS][FRAME_SAMPLES];
 };
 
 

audio.c

@@ -24,12 +24,14 @@ void trigger_sounds(Ampler_state *state) {
 }
 
 void sound_src_frame(Sound_src *s, s8 *mix[]) {
-	if s -> state == SND_LOOPING or s -> state == SND_PLAYING do
+	if s->state != SND_LOOPING and s->state != SND_PLAYING do
+		return;
+
 	for int i = 0; i < FRAME_SAMPLES; i += 1 do {
 		for int c = 0; c < CHANNELS; c += 1 do
 			mix[c][i] += s -> tracks[c][(int) s -> pos];
 
-		s -> pos += s -> speed;
+		s -> pos += s->speed * s->note_speed;
 
 		if s -> state == SND_LOOPING do {
 			while s -> pos < s -> start do
@@ -58,13 +60,14 @@ int audio_frame(Ampler_state *state) {
 	trigger_sounds(state);
 
 	// TODO: We should use CHANNELS here
-	static s8 mix_l[FRAME_SAMPLES] = { 0 }, mix_r[FRAME_SAMPLES] = { 0 };
+	// static s8 mix_l[FRAME_SAMPLES] = { 0 }, mix_r[FRAME_SAMPLES] = { 0 };
-	SDL_memset(mix_l, 0, sizeof mix_l);
+	s8 *mix_l = state->frame_mix[0], *mix_r = state->frame_mix[1];
-	SDL_memset(mix_r, 0, sizeof mix_r);
+	SDL_memset(mix_l, 0, FRAME_SAMPLES / sizeof s8);
+	SDL_memset(mix_r, 0, FRAME_SAMPLES / sizeof s8);
 
 	s8 *mix[] = { mix_l, mix_r };
-	foreach_ptr(Sound_src, snd, state -> sounds) //for int s = 0; s < arraylen(state -> sounds); s += 1 do
+	foreach_ptr(Sound_src, snd, state -> sounds)
-		sound_src_frame(snd, mix); //sound_src_frame(&(state -> sounds[s]), mix);
+		sound_src_frame(snd, mix);
 
 	const int vol = 100;
 	static s16 frame[FRAME_SAMPLES * CHANNELS] = { 0 };
@@ -78,7 +81,7 @@ int audio_frame(Ampler_state *state) {
 	return 1; // audio was qued
 }
 
-void load_track(Ampler_state *state) {
+void load_sample(Ampler_state *state, const char *file_name) {
 	Sound_src *snd = NULL;
 	foreach_ptr(Sound_src, s, state -> sounds)
 		if s -> state == SND_FREE do {
@@ -94,7 +97,7 @@ void load_track(Ampler_state *state) {
 	s16 *buffer = NULL;
 	u32 bytes = 0;
 
-	SDL_LoadWAV("sample.wav", &spec, &buffer, &bytes);
+	SDL_LoadWAV(file_name, &spec, &buffer, &bytes);
 
 	if spec.format != AUDIO_S16 do {
 		puts("error: sample.wav is not s16");
@@ -110,14 +113,20 @@ void load_track(Ampler_state *state) {
 	snd -> start = 0;
 	snd -> end = snd->track_len;
 	snd -> state = SND_STOPPED;
+	snd -> note_speed = 1.0f; // TODO: Look up a note ?
+	SDL_memset(snd->name, 0, sizeof snd->name);
+	for int i = 0; i < arraylen(snd->name) - 1; i += 1 do
+		if file_name[i] == '\0' or file_name[i] == '.' do break;
+		else snd->name[i] = file_name[i];
 
-	snd -> state = SND_LOOPING;
+	if snd == &(state->sounds[0]) do
-	snd -> end /= 2;
+		snd -> state = SND_LOOPING;
-	snd -> start = snd -> end / 2;
 
 	for int i = 0; i < CHANNELS; i += 1 do
 		snd -> tracks[i] = malloc(snd -> track_len);
 
+	// TODO: Change to a malloc wrapper that does gur error
+	// checking for us and also adds ptrs to gur half gc
 	for int i = 0; i < CHANNELS; i += 1 do
 		if !(snd -> tracks[i]) do
 			puts("fffuuuck");

draw.c

@@ -2,31 +2,68 @@
 
 void draw_frame(SDL_Window *w, SDL_Renderer *r, Ampler_state *state) {
 	SDL_SetRenderDrawColor(r, 0x1D, 0x2B, 0x53, 255);
-	//SDL_SetRenderDrawColor(r, 10, 10, 10, 100);
+
-	SDL_RenderClear(r);
+	SDL_SetRenderDrawBlendMode(r, SDL_BLENDMODE_BLEND);
+	SDL_SetRenderDrawColor(r, 10, 10, 10, 20);
+	SDL_Rect screen = { 0, 0, 512, 512 };
+	SDL_RenderFillRect(r, &screen);
+	// SDL_RenderClear(r);
 
 	// TODO: DRAW WITH X SCALE FACTOR
 	// TODO: DRAW SMOLER
 	SDL_SetRenderDrawColor(r, 0xFF, 0x00, 0x4D, 255);
 	const space = (44100 * 8) / 512;
-	// TODO: DRAW L / R OVERLAPPED IN DIFF COLORS ?
+	const int t = 0; // TODO: DRAW L / R OVERLAPPED IN DIFF COLORS ?
-	const int t = 0;
+	const int wav_h = 128;
+	if 0 do
 	foreach_ptr(Sound_src, snd, state -> sounds)
-		if snd -> state != SND_FREE do
+		if snd -> state != SND_FREE do {
-			for int x = 0; x < 512; x += 1 do {
+			const int y = wav_h / 2 + (wav_h + 4) * snd_i;
-				const int y = 128 + 256 * snd_i;
+			const int top = y - 64, bot = y + 64;
+			for int x = 0; x < 512 and x * space < snd->track_len; x += 1 do {
 				const int val = snd -> tracks[t][x * space];
-				SDL_RenderDrawLine(r, x, y + val / 8, x, y + val);
+				const int sign = val < 0 ? -1 : 1;
-				//SDL_RenderDrawPoint(r, x, y + val);
+				SDL_RenderDrawLine(r, x, y + sign, x, y + val / 2);
+				//SDL_RenderDrawPoint(r, x, y + val / 2);
 			}
 
-	if state -> played_audio_last_frame do
-	foreach_ptr(Sound_src, snd, state -> sounds)
-		if snd->state == SND_PLAYING or snd->state == SND_LOOPING do {
 			const int x = snd -> pos / space;
-			SDL_RenderDrawLine(r, x, 0, x, 512);
+			if state -> played_audio_last_frame do
-			SDL_RenderDrawLine(r, snd->start / space, 0, snd->start / space, 512);
+				SDL_RenderDrawLine(r, x, top, x, bot);
-			SDL_RenderDrawLine(r, snd->end / space, 0, snd->end / space, 512);
+			SDL_RenderDrawLine(r, snd->start / space, top, snd->start / space, bot);
+			SDL_RenderDrawLine(r, snd->end / space, top, snd->end / space, bot);
+		}
+
+	static u8 markov[256][256];
+	SDL_memset(markov, 0, sizeof markov);
+	for int x = 0; x < FRAME_SAMPLES - 1; x += 1 do {
+		u8 cur = state->frame_mix[0][x] + 128;
+		u8 next = state->frame_mix[0][x + 1] + 128;
+		markov[cur][255 - next] += 1;
+	}
+	for int x = 0; x < 256; x += 1 do {
+		u8 to = 0;
+		for int y = 0; y < 255; y += 1 do to += markov[x][y];
+		markov[x][255] = to;
+	}
+	for int x = 0; x < 256; x += 1 do {
+		u8 to = markov[x][255];
+		if to == 0 do continue;
+		for int y = 0; y < 255; y += 1 do
+			; //markov[x][y] *= to;
+	}
+
+	for int x = 0; x < 256; x += 1 do	
+		for int y = 0; y < 256; y += 1 do {
+			u8 m = markov[x][y];
+			const int s = 20;
+			SDL_SetRenderDrawColor(r, m * s, m * s, m * s, 255);
+			if m != 0 do {
+				SDL_RenderDrawPoint(r, x * 2, y * 2);
+				SDL_RenderDrawPoint(r, x * 2 + 1, y * 2);
+				SDL_RenderDrawPoint(r, x * 2, y * 2 + 1);
+				SDL_RenderDrawPoint(r, x * 2 + 1, y * 2 + 1);
+			}
 		}
 
 	SDL_RenderPresent(r);