1 files changed, 458 insertions, 0 deletions
diff --git a/src/decoder/dsdiff_decoder_plugin.c b/src/decoder/dsdiff_decoder_plugin.c
new file mode 100644
index 000000000..ae42002dd
--- /dev/null
+++ b/src/decoder/dsdiff_decoder_plugin.c
@@ -0,0 +1,458 @@
+/*
+ * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/* \file
+ *
+ * This plugin decodes DSDIFF data (SACD) embedded in DFF files.  It
+ * was modeled after the specification found here:
+ * http://www.sonicstudio.com/pdf/dsd/DSDIFF_1.5_Spec.pdf
+ */
+
+#include "config.h"
+#include "dsdiff_decoder_plugin.h"
+#include "decoder_api.h"
+#include "audio_check.h"
+#include "util/bit_reverse.h"
+
+#include <unistd.h>
+#include <stdio.h> /* for SEEK_SET, SEEK_CUR */
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "dsdiff"
+
+struct dsdiff_id {
+	char value[4];
+};
+
+struct dsdiff_header {
+	struct dsdiff_id id;
+	uint32_t size_high, size_low;
+	struct dsdiff_id format;
+};
+
+struct dsdiff_chunk_header {
+	struct dsdiff_id id;
+	uint32_t size_high, size_low;
+};
+
+struct dsdiff_metadata {
+	unsigned sample_rate, channels;
+};
+
+static bool lsbitfirst;
+
+static bool
+dsdiff_init(const struct config_param *param)
+{
+	lsbitfirst = config_get_block_bool(param, "lsbitfirst", false);
+	return true;
+}
+
+static bool
+dsdiff_id_equals(const struct dsdiff_id *id, const char *s)
+{
+	assert(id != NULL);
+	assert(s != NULL);
+	assert(strlen(s) == sizeof(id->value));
+
+	return memcmp(id->value, s, sizeof(id->value)) == 0;
+}
+
+/**
+ * Read the "size" attribute from the specified header, converting it
+ * to the host byte order if needed.
+ */
+G_GNUC_CONST
+static uint64_t
+dsdiff_chunk_size(const struct dsdiff_chunk_header *header)
+{
+	return (((uint64_t)GUINT32_FROM_BE(header->size_high)) << 32) |
+		((uint64_t)GUINT32_FROM_BE(header->size_low));
+}
+
+static bool
+dsdiff_read(struct decoder *decoder, struct input_stream *is,
+	    void *data, size_t length)
+{
+	size_t nbytes = decoder_read(decoder, is, data, length);
+	return nbytes == length;
+}
+
+static bool
+dsdiff_read_id(struct decoder *decoder, struct input_stream *is,
+	       struct dsdiff_id *id)
+{
+	return dsdiff_read(decoder, is, id, sizeof(*id));
+}
+
+static bool
+dsdiff_read_chunk_header(struct decoder *decoder, struct input_stream *is,
+			 struct dsdiff_chunk_header *header)
+{
+	return dsdiff_read(decoder, is, header, sizeof(*header));
+}
+
+static bool
+dsdiff_read_payload(struct decoder *decoder, struct input_stream *is,
+		    const struct dsdiff_chunk_header *header,
+		    void *data, size_t length)
+{
+	uint64_t size = dsdiff_chunk_size(header);
+	if (size != (uint64_t)length)
+		return false;
+
+	size_t nbytes = decoder_read(decoder, is, data, length);
+	return nbytes == length;
+}
+
+/**
+ * Skip the #input_stream to the specified offset.
+ */
+static bool
+dsdiff_skip_to(struct decoder *decoder, struct input_stream *is,
+	       goffset offset)
+{
+	if (is->seekable)
+		return input_stream_seek(is, offset, SEEK_SET, NULL);
+
+	if (is->offset > offset)
+		return false;
+
+	char buffer[8192];
+	while (is->offset < offset) {
+		size_t length = sizeof(buffer);
+		if (offset - is->offset < (goffset)length)
+			length = offset - is->offset;
+
+		size_t nbytes = decoder_read(decoder, is, buffer, length);
+		if (nbytes == 0)
+			return false;
+	}
+
+	assert(is->offset == offset);
+	return true;
+}
+
+/**
+ * Skip some bytes from the #input_stream.
+ */
+static bool
+dsdiff_skip(struct decoder *decoder, struct input_stream *is,
+	    goffset delta)
+{
+	assert(delta >= 0);
+
+	if (delta == 0)
+		return true;
+
+	if (is->seekable)
+		return input_stream_seek(is, delta, SEEK_CUR, NULL);
+
+	char buffer[8192];
+	while (delta > 0) {
+		size_t length = sizeof(buffer);
+		if ((goffset)length > delta)
+			length = delta;
+
+		size_t nbytes = decoder_read(decoder, is, buffer, length);
+		if (nbytes == 0)
+			return false;
+
+		delta -= nbytes;
+	}
+
+	return true;
+}
+
+/**
+ * Read and parse a "SND" chunk inside "PROP".
+ */
+static bool
+dsdiff_read_prop_snd(struct decoder *decoder, struct input_stream *is,
+		     struct dsdiff_metadata *metadata,
+		     goffset end_offset)
+{
+	struct dsdiff_chunk_header header;
+	while ((goffset)(is->offset + sizeof(header)) <= end_offset) {
+		if (!dsdiff_read_chunk_header(decoder, is, &header))
+			return false;
+
+		goffset chunk_end_offset =
+			is->offset + dsdiff_chunk_size(&header);
+		if (chunk_end_offset > end_offset)
+			return false;
+
+		if (dsdiff_id_equals(&header.id, "FS  ")) {
+			uint32_t sample_rate;
+			if (!dsdiff_read_payload(decoder, is, &header,
+						 &sample_rate,
+						 sizeof(sample_rate)))
+				return false;
+
+			metadata->sample_rate = GUINT32_FROM_BE(sample_rate);
+		} else if (dsdiff_id_equals(&header.id, "CHNL")) {
+			uint16_t channels;
+			if (dsdiff_chunk_size(&header) < sizeof(channels) ||
+			    !dsdiff_read(decoder, is,
+					 &channels, sizeof(channels)) ||
+			    !dsdiff_skip_to(decoder, is, chunk_end_offset))
+				return false;
+
+			metadata->channels = GUINT16_FROM_BE(channels);
+		} else if (dsdiff_id_equals(&header.id, "CMPR")) {
+			struct dsdiff_id type;
+			if (dsdiff_chunk_size(&header) < sizeof(type) ||
+			    !dsdiff_read(decoder, is,
+					 &type, sizeof(type)) ||
+			    !dsdiff_skip_to(decoder, is, chunk_end_offset))
+				return false;
+
+			if (!dsdiff_id_equals(&type, "DSD "))
+				/* only uincompressed DSD audio data
+				   is implemented */
+				return false;
+		} else {
+			/* ignore unknown chunk */
+
+			if (!dsdiff_skip_to(decoder, is, chunk_end_offset))
+				return false;
+		}
+	}
+
+	return is->offset == end_offset;
+}
+
+/**
+ * Read and parse a "PROP" chunk.
+ */
+static bool
+dsdiff_read_prop(struct decoder *decoder, struct input_stream *is,
+		 struct dsdiff_metadata *metadata,
+		 const struct dsdiff_chunk_header *prop_header)
+{
+	uint64_t prop_size = dsdiff_chunk_size(prop_header);
+	goffset end_offset = is->offset + prop_size;
+
+	struct dsdiff_id prop_id;
+	if (prop_size < sizeof(prop_id) ||
+	    !dsdiff_read_id(decoder, is, &prop_id))
+		return false;
+
+	if (dsdiff_id_equals(&prop_id, "SND "))
+		return dsdiff_read_prop_snd(decoder, is, metadata, end_offset);
+	else
+		/* ignore unknown PROP chunk */
+		return dsdiff_skip_to(decoder, is, end_offset);
+}
+
+/**
+ * Read and parse all metadata chunks at the beginning.  Stop when the
+ * first "DSD" chunk is seen, and return its header in the
+ * "chunk_header" parameter.
+ */
+static bool
+dsdiff_read_metadata(struct decoder *decoder, struct input_stream *is,
+		     struct dsdiff_metadata *metadata,
+		     struct dsdiff_chunk_header *chunk_header)
+{
+	struct dsdiff_header header;
+	if (!dsdiff_read(decoder, is, &header, sizeof(header)) ||
+	    !dsdiff_id_equals(&header.id, "FRM8") ||
+	    !dsdiff_id_equals(&header.format, "DSD "))
+		return false;
+
+	while (true) {
+		if (!dsdiff_read_chunk_header(decoder, is, chunk_header))
+			return false;
+
+		if (dsdiff_id_equals(&chunk_header->id, "PROP")) {
+			if (!dsdiff_read_prop(decoder, is, metadata,
+					      chunk_header))
+				return false;
+		} else if (dsdiff_id_equals(&chunk_header->id, "DSD ")) {
+			/* done with metadata */
+			return true;
+		} else {
+			/* ignore unknown chunk */
+
+			uint64_t chunk_size = dsdiff_chunk_size(chunk_header);
+			goffset chunk_end_offset = is->offset + chunk_size;
+
+			if (!dsdiff_skip_to(decoder, is, chunk_end_offset))
+				return false;
+		}
+	}
+}
+
+static void
+bit_reverse_buffer(uint8_t *p, uint8_t *end)
+{
+	for (; p < end; ++p)
+		*p = bit_reverse(*p);
+}
+
+/**
+ * Decode one "DSD" chunk.
+ */
+static bool
+dsdiff_decode_chunk(struct decoder *decoder, struct input_stream *is,
+		    unsigned channels,
+		    uint64_t chunk_size)
+{
+	uint8_t buffer[8192];
+	const size_t sample_size = sizeof(buffer[0]);
+	const size_t frame_size = channels * sample_size;
+	const unsigned buffer_frames = sizeof(buffer) / frame_size;
+	const unsigned buffer_samples = buffer_frames * frame_size;
+	const size_t buffer_size = buffer_samples * sample_size;
+
+	while (chunk_size > 0) {
+		/* see how much aligned data from the remaining chunk
+		   fits into the local buffer */
+		unsigned now_frames = buffer_frames;
+		size_t now_size = buffer_size;
+		if (chunk_size < (uint64_t)now_size) {
+			now_frames = (unsigned)chunk_size / frame_size;
+			now_size = now_frames * frame_size;
+		}
+
+		size_t nbytes = decoder_read(decoder, is, buffer, now_size);
+		if (nbytes != now_size)
+			return false;
+
+		chunk_size -= nbytes;
+
+		if (lsbitfirst)
+			bit_reverse_buffer(buffer, buffer + nbytes);
+
+		enum decoder_command cmd =
+			decoder_data(decoder, is, buffer, nbytes, 0);
+		switch (cmd) {
+		case DECODE_COMMAND_NONE:
+			break;
+
+		case DECODE_COMMAND_START:
+		case DECODE_COMMAND_STOP:
+			return false;
+
+		case DECODE_COMMAND_SEEK:
+			/* not implemented yet */
+			decoder_seek_error(decoder);
+			break;
+		}
+	}
+
+	return dsdiff_skip(decoder, is, chunk_size);
+}
+
+static void
+dsdiff_stream_decode(struct decoder *decoder, struct input_stream *is)
+{
+	struct dsdiff_metadata metadata = {
+		.sample_rate = 0,
+		.channels = 0,
+	};
+
+	struct dsdiff_chunk_header chunk_header;
+	if (!dsdiff_read_metadata(decoder, is, &metadata, &chunk_header))
+		return;
+
+	GError *error = NULL;
+	struct audio_format audio_format;
+	if (!audio_format_init_checked(&audio_format, metadata.sample_rate / 8,
+				       SAMPLE_FORMAT_DSD,
+				       metadata.channels, &error)) {
+		g_warning("%s", error->message);
+		g_error_free(error);
+		return;
+	}
+
+	/* success: file was recognized */
+
+	decoder_initialized(decoder, &audio_format, false, -1);
+
+	/* every iteration of the following loop decodes one "DSD"
+	   chunk */
+
+	while (true) {
+		uint64_t chunk_size = dsdiff_chunk_size(&chunk_header);
+
+		if (dsdiff_id_equals(&chunk_header.id, "DSD ")) {
+			if (!dsdiff_decode_chunk(decoder, is,
+						 metadata.channels,
+						 chunk_size))
+				break;
+		} else {
+			/* ignore other chunks */
+
+			if (!dsdiff_skip(decoder, is, chunk_size))
+				break;
+		}
+
+		/* read next chunk header; the first one was read by
+		   dsdiff_read_metadata() */
+
+		if (!dsdiff_read_chunk_header(decoder, is, &chunk_header))
+			break;
+	}
+}
+
+static bool
+dsdiff_scan_stream(struct input_stream *is,
+		   G_GNUC_UNUSED const struct tag_handler *handler,
+		   G_GNUC_UNUSED void *handler_ctx)
+{
+	struct dsdiff_metadata metadata = {
+		.sample_rate = 0,
+		.channels = 0,
+	};
+
+	struct dsdiff_chunk_header chunk_header;
+	if (!dsdiff_read_metadata(NULL, is, &metadata, &chunk_header))
+		return false;
+
+	struct audio_format audio_format;
+	if (!audio_format_init_checked(&audio_format, metadata.sample_rate / 8,
+				       SAMPLE_FORMAT_DSD,
+				       metadata.channels, NULL))
+		/* refuse to parse files which we cannot play anyway */
+		return false;
+
+	/* no total time estimate, no tags implemented yet */
+	return true;
+}
+
+static const char *const dsdiff_suffixes[] = {
+	"dff",
+	NULL
+};
+
+static const char *const dsdiff_mime_types[] = {
+	"application/x-dff",
+	NULL
+};
+
+const struct decoder_plugin dsdiff_decoder_plugin = {
+	.name = "dsdiff",
+	.init = dsdiff_init,
+	.stream_decode = dsdiff_stream_decode,
+	.scan_stream = dsdiff_scan_stream,
+	.suffixes = dsdiff_suffixes,
+	.mime_types = dsdiff_mime_types,
+};