1 files changed, 266 insertions, 0 deletions
diff --git a/src/tools/dsffile.c b/src/tools/dsffile.c
new file mode 100644
index 0000000..9c6ce0c
--- /dev/null
+++ b/src/tools/dsffile.c
@@ -0,0 +1,266 @@
+/* PipeWire
+ *
+ * Copyright © 2021 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <errno.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <math.h>
+
+#include <spa/utils/string.h>
+
+#include "dsffile.h"
+
+struct dsf_file {
+	uint8_t *data;
+	size_t size;
+
+	int mode;
+	int fd;
+
+	struct dsf_file_info info;
+
+	uint8_t *p;
+	size_t offset;
+};
+
+static inline uint32_t parse_le32(const uint8_t *in)
+{
+	return in[0] | (in[1] << 8) | (in[2] << 16) | (in[3] << 24);
+}
+
+static inline uint64_t parse_le64(const uint8_t *in)
+{
+	uint64_t res = in[0];
+	res |= ((uint64_t)in[1]) << 8;
+	res |= ((uint64_t)in[2]) << 16;
+	res |= ((uint64_t)in[3]) << 24;
+	res |= ((uint64_t)in[4]) << 32;
+	res |= ((uint64_t)in[5]) << 40;
+	res |= ((uint64_t)in[6]) << 48;
+	res |= ((uint64_t)in[7]) << 56;
+	return res;
+}
+
+static inline int f_avail(struct dsf_file *f)
+{
+	if (f->p < f->data + f->size)
+		return f->size + f->data - f->p;
+	return 0;
+}
+
+static int read_DSD(struct dsf_file *f)
+{
+	uint64_t size;
+
+	if (f_avail(f) < 28 ||
+	    memcmp(f->p, "DSD ", 4) != 0)
+		return -EINVAL;
+
+	size = parse_le64(f->p + 4);	/* size of this chunk */
+	parse_le64(f->p + 12);		/* total size */
+	parse_le64(f->p + 20);		/* metadata */
+	f->p += size;
+	return 0;
+}
+
+static int read_fmt(struct dsf_file *f)
+{
+	uint64_t size;
+
+	if (f_avail(f) < 52 ||
+	    memcmp(f->p, "fmt ", 4) != 0)
+		return -EINVAL;
+
+	size = parse_le64(f->p + 4);	/* size of this chunk */
+	if (parse_le32(f->p + 12) != 1)	/* version */
+		return -EINVAL;
+	if (parse_le32(f->p + 16) != 0)	/* format id */
+		return -EINVAL;
+
+	f->info.channel_type = parse_le32(f->p + 20);
+	f->info.channels = parse_le32(f->p + 24);
+	f->info.rate = parse_le32(f->p + 28);
+	f->info.lsb = parse_le32(f->p + 32) == 1;
+	f->info.samples = parse_le64(f->p + 36);
+	f->info.blocksize = parse_le32(f->p + 44);
+	f->p += size;
+	return 0;
+}
+
+static int read_data(struct dsf_file *f)
+{
+	uint64_t size;
+
+	if (f_avail(f) < 12 ||
+	    memcmp(f->p, "data", 4) != 0)
+		return -EINVAL;
+
+	size = parse_le64(f->p + 4);	/* size of this chunk */
+	f->info.length = size - 12;
+	f->p += 12;
+	return 0;
+}
+
+static int open_read(struct dsf_file *f, const char *filename, struct dsf_file_info *info)
+{
+	int res;
+	struct stat st;
+
+	if ((f->fd = open(filename, O_RDONLY)) < 0) {
+		res = -errno;
+		goto exit;
+	}
+	if (fstat(f->fd, &st) < 0) {
+		res = -errno;
+		goto exit_close;
+	}
+	f->size = st.st_size;
+
+	f->data = mmap(NULL, f->size, PROT_READ, MAP_SHARED, f->fd, 0);
+	if (f->data == MAP_FAILED) {
+		res = -errno;
+		goto exit_close;
+	}
+
+	f->p = f->data;
+
+	if ((res = read_DSD(f)) < 0)
+		goto exit_unmap;
+	if ((res = read_fmt(f)) < 0)
+		goto exit_unmap;
+	if ((res = read_data(f)) < 0)
+		goto exit_unmap;
+
+	f->mode = 1;
+	*info = f->info;
+	return 0;
+
+exit_unmap:
+	munmap(f->data, f->size);
+exit_close:
+	close(f->fd);
+exit:
+	return res;
+}
+
+struct dsf_file *
+dsf_file_open(const char *filename, const char *mode, struct dsf_file_info *info)
+{
+        int res;
+        struct dsf_file *f;
+
+        f = calloc(1, sizeof(struct dsf_file));
+        if (f == NULL)
+                return NULL;
+
+        if (spa_streq(mode, "r")) {
+                if ((res = open_read(f, filename, info)) < 0)
+                        goto exit_free;
+        } else {
+                res = -EINVAL;
+                goto exit_free;
+        }
+        return f;
+
+exit_free:
+        free(f);
+        errno = -res;
+        return NULL;
+}
+
+static const uint8_t bitrev[256] = {
+	0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
+	0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
+	0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
+	0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
+	0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
+	0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
+	0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
+	0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
+	0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
+	0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
+	0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
+	0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
+	0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
+	0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
+	0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
+	0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
+};
+
+ssize_t
+dsf_file_read(struct dsf_file *f, void *data, size_t samples, const struct dsf_layout *layout)
+{
+	uint8_t *d = data;
+	int step = SPA_ABS(layout->interleave);
+	bool rev = layout->lsb != f->info.lsb;
+	size_t total, block, offset, pos, scale;
+
+	block = f->offset / f->info.blocksize;
+	offset = block * f->info.blocksize * f->info.channels;
+	pos = f->offset % f->info.blocksize;
+	scale = SPA_CLAMP(f->info.rate / (44100u * 64u), 1u, 4u);
+
+	samples *= step;
+	samples *= scale;
+
+	for (total = 0; total < samples && offset + pos < f->info.length; total++) {
+		const uint8_t *s = f->p + offset + pos;
+		uint32_t i;
+
+		for (i = 0; i < layout->channels; i++) {
+			const uint8_t *c = &s[f->info.blocksize * i];
+			int j;
+
+			if (layout->interleave > 0) {
+				for (j = 0; j < step; j++)
+					*d++ = rev ? bitrev[c[j]] : c[j];
+			} else {
+				for (j = step-1; j >= 0; j--)
+					*d++ = rev ? bitrev[c[j]] : c[j];
+			}
+		}
+		pos += step;
+		if (pos == f->info.blocksize) {
+			pos = 0;
+			offset += f->info.blocksize * f->info.channels;
+		}
+	}
+	f->offset += total * step;
+
+	return total;
+}
+
+int dsf_file_close(struct dsf_file *f)
+{
+	if (f->mode == 1) {
+		munmap(f->data, f->size);
+	} else
+		return -EINVAL;
+
+	close(f->fd);
+	free(f);
+	return 0;
+}