From cc0d7642ca65172768a4a7c365c7f4e77f612b12 Mon Sep 17 00:00:00 2001
From: Vito Caputo <vcaputo@pengaru.com>
Date: Fri, 10 May 2019 02:20:39 -0700
Subject: examples: add an sdl2 example

---
 examples/playit-sdl2.c | 134 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 examples/playit-sdl2.c

(limited to 'examples/playit-sdl2.c')

diff --git a/examples/playit-sdl2.c b/examples/playit-sdl2.c
new file mode 100644
index 0000000..d1946ad
--- /dev/null
+++ b/examples/playit-sdl2.c
@@ -0,0 +1,134 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <SDL.h>
+
+#include "sndfile.h"
+#include "fmt.h"
+
+/*
+ * gcc -O2 -o playit-sdl2 playit-sdl2.c -I.. -I../src/include -DHAVE_CONFIG_H -lm `pkg-config sdl2 --cflags --libs` -s ../src/libplayit.a
+ */
+
+static song_t * song_load_it(const char *file)
+{
+	slurp_t	*s;
+	song_t	*song;
+
+	s = slurp(file, NULL, 0);
+	if (!s) {
+		printf("failed to open \"%s\"\n", file);
+		goto _fail;
+	}
+
+	song = csf_allocate();
+	if (!song) {
+		printf("failed to allocate song\n");
+		goto _fail_slurp;
+	}
+
+	if (fmt_it_load_song(song, s, 0) != LOAD_SUCCESS)
+		goto _fail_song;
+
+	unslurp(s);
+
+	return song;
+
+_fail_song:
+	csf_free(song);
+_fail_slurp:
+	unslurp(s);
+_fail:
+	return NULL;
+}
+
+
+static SDL_AudioDeviceID sdl2_open(const char *device)
+{
+	SDL_AudioDeviceID	dev;
+
+	SDL_AudioSpec	aspec = {
+		.freq = 44100,
+		.format = AUDIO_S16,
+		.channels = 2,
+		.samples = 4096,
+	};
+
+	if (SDL_Init(SDL_INIT_AUDIO) != 0) {
+		printf("Failed to initialize SDL w/audio!\n");
+		return -1;
+	}
+
+	dev = SDL_OpenAudioDevice(device, 0, &aspec, NULL, 0);
+	if (dev < 0) {
+		printf("Failed to open SDL audio device!\n");
+		return -1;
+	}
+
+	SDL_PauseAudioDevice(dev, 0);
+
+	return dev;
+}
+
+
+static void sdl2_close(SDL_AudioDeviceID dev)
+{
+	SDL_CloseAudioDevice(dev);
+}
+
+
+int main(int argc, const char *argv[])
+{
+	song_t			*song;
+	uint8_t			buf[8192];
+	int			len;
+	SDL_AudioDeviceID	dev;
+
+	if (argc != 2) {
+		printf("usage: %s song.it\n", argv[0]);
+		goto _fail;
+	}
+
+	song = song_load_it(argv[1]);
+	if (!song) {
+		printf("failed to load song!\n");
+		goto _fail;
+	}
+
+	if (!(dev = sdl2_open(NULL))) {
+		printf("Failed to open audio!\n");
+		goto _fail_song;
+	}
+
+	csf_set_current_order(song, 0);
+	song->repeat_count = 0;
+	song->buffer_count = 0;
+	song->stop_at_order = -1;
+	song->stop_at_row = -1;
+	song->flags &= ~(SONG_PAUSED | SONG_PATTERNLOOP | SONG_ENDREACHED);
+	csf_reset_playmarks(song);
+	csf_set_resampling_mode(song, SRCMODE_LINEAR);
+	csf_set_wave_config(song, 44100, 16, 2);
+
+	while ((len = csf_read(song, buf, sizeof(buf)))) {
+		int	err;
+
+		while (SDL_GetQueuedAudioSize(dev) > 8192)
+			SDL_Delay(10);
+
+		if ((err = SDL_QueueAudio(dev, buf, len * 4)) < 0) {
+			fprintf(stderr, "write failed (%s)\n", SDL_GetError());
+			break;
+		}
+	}
+
+	sdl2_close(dev);
+
+	return EXIT_SUCCESS;
+
+_fail_song:
+	/* TODO cleanup song */
+
+_fail:
+	return EXIT_FAILURE;
+}
-- 
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