1 files changed, 138 insertions, 0 deletions
diff --git a/compress_hw.c b/compress_hw.c
new file mode 100644
index 0000000..b2252cc
--- /dev/null
+++ b/compress_hw.c
@@ -0,0 +1,138 @@
+/* compress_hw.c
+**
+** Copyright (c) 2019, The Linux Foundation. All rights reserved.
+**
+** Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above
+**     copyright notice, this list of conditions and the following
+**     disclaimer in the documentation and/or other materials provided
+**     with the distribution.
+**   * Neither the name of The Linux Foundation nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+** ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+**/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <string.h>
+#include <stdbool.h>
+#include <errno.h>
+#include <unistd.h>
+#include <poll.h>
+
+#include <sys/ioctl.h>
+#include <linux/ioctl.h>
+#include <sound/asound.h>
+#include "tinycompress/tinycompress.h"
+#include "compress_ops.h"
+
+struct compress_hw_data {
+	unsigned int card;
+	unsigned int device;
+	unsigned int fd;
+};
+
+static int compress_hw_poll(void *data, struct pollfd *fds,
+				nfds_t nfds, int timeout)
+{
+	struct compress_hw_data *hw_data = data;
+
+	fds->fd = hw_data->fd;
+	return poll(fds, nfds, timeout);
+}
+
+static int compress_hw_write(void *data, const void *buf, size_t size)
+{
+	struct compress_hw_data *hw_data = data;
+
+	return write(hw_data->fd, buf, size);
+}
+
+static int compress_hw_read(void *data, void *buf, size_t size)
+{
+	struct compress_hw_data *hw_data = data;
+
+	return read(hw_data->fd, buf, size);
+}
+
+static int compress_hw_ioctl(void *data, unsigned int cmd, ...)
+{
+	struct compress_hw_data *hw_data = data;
+	va_list ap;
+	void *arg;
+
+	va_start(ap, cmd);
+	arg = va_arg(ap, void *);
+	va_end(ap);
+
+	return ioctl(hw_data->fd, cmd, arg);
+}
+
+static void compress_hw_close(void *data)
+{
+	struct compress_hw_data *hw_data = data;
+
+	if (hw_data->fd > 0)
+		close(hw_data->fd);
+
+	free(hw_data);
+}
+
+static int compress_hw_open(unsigned int card, unsigned int device,
+		unsigned int flags, void **data, __unused void *node)
+{
+	struct compress_hw_data *hw_data;
+	char fn[256];
+	int fd;
+
+	hw_data = calloc(1, sizeof(*hw_data));
+	if (!hw_data) {
+		return -ENOMEM;
+	}
+
+	snprintf(fn, sizeof(fn), "/dev/snd/comprC%uD%u", card, device);
+
+	if (flags & COMPRESS_OUT)
+		fd = open(fn,  O_RDONLY);
+	else
+		fd = open(fn, O_WRONLY);
+
+	if (fd < 0) {
+		return fd;
+	}
+
+	hw_data->card = card;
+	hw_data->device = device;
+	hw_data->fd = fd;
+
+	*data = hw_data;
+
+	return fd;
+}
+
+struct compress_ops compr_hw_ops = {
+	.open = compress_hw_open,
+	.close = compress_hw_close,
+	.ioctl = compress_hw_ioctl,
+	.read = compress_hw_read,
+	.write = compress_hw_write,
+	.poll = compress_hw_poll,
+};