From e117e43bd06627f7fadb2c58adf07e058f100579 Mon Sep 17 00:00:00 2001
From: neonloop
Date: Fri, 12 Mar 2021 16:11:08 +0000
Subject: Initial trimui s support

---
 shell/audio/oss/sound_output.c | 63 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 shell/audio/oss/sound_output.c

(limited to 'shell/audio/oss')

diff --git a/shell/audio/oss/sound_output.c b/shell/audio/oss/sound_output.c
new file mode 100644
index 0000000..39a7ba3
--- /dev/null
+++ b/shell/audio/oss/sound_output.c
@@ -0,0 +1,63 @@
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <stdint.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/soundcard.h>
+
+#include "sound_output.h"
+
+static int32_t oss_audio_fd = -1;
+
+uint32_t Audio_Init()
+{
+	uint32_t channels = 2;
+	uint32_t format = AFMT_S16_LE;
+	uint32_t tmp = SOUND_OUTPUT_FREQUENCY;
+	int32_t err_ret;
+
+	oss_audio_fd = open("/dev/dsp", O_WRONLY | O_NONBLOCK);
+	if (oss_audio_fd < 0)
+	{
+		printf("Couldn't open /dev/dsp.\n");
+		return 1;
+	}
+	
+	err_ret = ioctl(oss_audio_fd, SNDCTL_DSP_SPEED,&tmp);
+	if (err_ret == -1)
+	{
+		printf("Could not set sound frequency\n");
+		return 1;
+	}
+	err_ret = ioctl(oss_audio_fd, SNDCTL_DSP_CHANNELS, &channels);
+	if (err_ret == -1)
+	{
+		printf("Could not set channels\n");
+		return 1;
+	}
+	err_ret = ioctl(oss_audio_fd, SNDCTL_DSP_SETFMT, &format);
+	if (err_ret == -1)
+	{
+		printf("Could not set sound format\n");
+		return 1;
+	}
+	return 0;
+}
+
+void Audio_Write(int16_t* restrict buffer, uint32_t buffer_size)
+{
+	write(oss_audio_fd, buffer, buffer_size * 4 );
+}
+
+bool Audio_Underrun_Likely() {
+	return false;
+}
+
+void Audio_Close()
+{
+	if (oss_audio_fd >= 0)
+	{
+		close(oss_audio_fd);
+		oss_audio_fd = -1;
+	}
+}
-- 
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