From e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb Mon Sep 17 00:00:00 2001 From: Yang Zhang Date: Fri, 28 Aug 2015 09:58:54 +0800 Subject: Add qemu 2.4.0 Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5 Signed-off-by: Yang Zhang --- qemu/roms/u-boot/drivers/sound/sound.c | 37 ++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 qemu/roms/u-boot/drivers/sound/sound.c (limited to 'qemu/roms/u-boot/drivers/sound/sound.c') diff --git a/qemu/roms/u-boot/drivers/sound/sound.c b/qemu/roms/u-boot/drivers/sound/sound.c new file mode 100644 index 000000000..9dda2dba8 --- /dev/null +++ b/qemu/roms/u-boot/drivers/sound/sound.c @@ -0,0 +1,37 @@ +/* + * Copyright (C) 2012 Samsung Electronics + * R. Chandrasekar + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include + +void sound_create_square_wave(unsigned short *data, int size, uint32_t freq) +{ + const int sample = 48000; + const unsigned short amplitude = 16000; /* between 1 and 32767 */ + const int period = freq ? sample / freq : 0; + const int half = period / 2; + + assert(freq); + + /* Make sure we don't overflow our buffer */ + if (size % 2) + size--; + + while (size) { + int i; + for (i = 0; size && i < half; i++) { + size -= 2; + *data++ = amplitude; + *data++ = amplitude; + } + for (i = 0; size && i < period - half; i++) { + size -= 2; + *data++ = -amplitude; + *data++ = -amplitude; + } + } +} -- cgit 1.2.3-korg