1 files changed, 383 insertions, 0 deletions
diff --git a/src/decoder/FLACDecoderPlugin.cxx b/src/decoder/FLACDecoderPlugin.cxx
new file mode 100644
index 00000000..43b60409
--- /dev/null
+++ b/src/decoder/FLACDecoderPlugin.cxx
@@ -0,0 +1,383 @@
+/*
+ * Copyright (C) 2003-2012 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.
+ */
+
+#include "config.h" /* must be first for large file support */
+#include "FLACDecoderPlugin.h"
+#include "FLACCommon.hxx"
+#include "FLACMetaData.hxx"
+#include "OggCodec.hxx"
+
+#include <glib.h>
+
+#include <assert.h>
+#include <unistd.h>
+
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#if !defined(FLAC_API_VERSION_CURRENT) || FLAC_API_VERSION_CURRENT <= 7
+#error libFLAC is too old
+#endif
+
+static void flacPrintErroredState(FLAC__StreamDecoderState state)
+{
+	switch (state) {
+	case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
+	case FLAC__STREAM_DECODER_READ_METADATA:
+	case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
+	case FLAC__STREAM_DECODER_READ_FRAME:
+	case FLAC__STREAM_DECODER_END_OF_STREAM:
+		return;
+
+	case FLAC__STREAM_DECODER_OGG_ERROR:
+	case FLAC__STREAM_DECODER_SEEK_ERROR:
+	case FLAC__STREAM_DECODER_ABORTED:
+	case FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR:
+	case FLAC__STREAM_DECODER_UNINITIALIZED:
+		break;
+	}
+
+	g_warning("%s\n", FLAC__StreamDecoderStateString[state]);
+}
+
+static void flacMetadata(G_GNUC_UNUSED const FLAC__StreamDecoder * dec,
+			 const FLAC__StreamMetadata * block, void *vdata)
+{
+	flac_metadata_common_cb(block, (struct flac_data *) vdata);
+}
+
+static FLAC__StreamDecoderWriteStatus
+flac_write_cb(const FLAC__StreamDecoder *dec, const FLAC__Frame *frame,
+	      const FLAC__int32 *const buf[], void *vdata)
+{
+	struct flac_data *data = (struct flac_data *) vdata;
+	FLAC__uint64 nbytes = 0;
+
+	if (FLAC__stream_decoder_get_decode_position(dec, &nbytes)) {
+		if (data->position > 0 && nbytes > data->position) {
+			nbytes -= data->position;
+			data->position += nbytes;
+		} else {
+			data->position = nbytes;
+			nbytes = 0;
+		}
+	} else
+		nbytes = 0;
+
+	return flac_common_write(data, frame, buf, nbytes);
+}
+
+static bool
+flac_scan_file(const char *file,
+	       const struct tag_handler *handler, void *handler_ctx)
+{
+	FLACMetadataChain chain;
+	if (!chain.Read(file)) {
+		g_debug("Failed to read FLAC tags: %s",
+			chain.GetStatusString());
+		return false;
+	}
+
+	chain.Scan(handler, handler_ctx);
+	return true;
+}
+
+static bool
+flac_scan_stream(struct input_stream *is,
+		 const struct tag_handler *handler, void *handler_ctx)
+{
+	FLACMetadataChain chain;
+	if (!chain.Read(is)) {
+		g_debug("Failed to read FLAC tags: %s",
+			chain.GetStatusString());
+		return false;
+	}
+
+	chain.Scan(handler, handler_ctx);
+	return true;
+}
+
+/**
+ * Some glue code around FLAC__stream_decoder_new().
+ */
+static FLAC__StreamDecoder *
+flac_decoder_new(void)
+{
+	FLAC__StreamDecoder *sd = FLAC__stream_decoder_new();
+	if (sd == nullptr) {
+		g_warning("FLAC__stream_decoder_new() failed");
+		return nullptr;
+	}
+
+	if(!FLAC__stream_decoder_set_metadata_respond(sd, FLAC__METADATA_TYPE_VORBIS_COMMENT))
+		g_debug("FLAC__stream_decoder_set_metadata_respond() has failed");
+
+	return sd;
+}
+
+static bool
+flac_decoder_initialize(struct flac_data *data, FLAC__StreamDecoder *sd,
+			FLAC__uint64 duration)
+{
+	data->total_frames = duration;
+
+	if (!FLAC__stream_decoder_process_until_end_of_metadata(sd)) {
+		g_warning("problem reading metadata");
+		return false;
+	}
+
+	if (data->initialized) {
+		/* done */
+		decoder_initialized(data->decoder, &data->audio_format,
+				    data->input_stream->seekable,
+				    (float)data->total_frames /
+				    (float)data->audio_format.sample_rate);
+		return true;
+	}
+
+	if (data->input_stream->seekable)
+		/* allow the workaround below only for nonseekable
+		   streams*/
+		return false;
+
+	/* no stream_info packet found; try to initialize the decoder
+	   from the first frame header */
+	FLAC__stream_decoder_process_single(sd);
+	return data->initialized;
+}
+
+static void
+flac_decoder_loop(struct flac_data *data, FLAC__StreamDecoder *flac_dec,
+		  FLAC__uint64 t_start, FLAC__uint64 t_end)
+{
+	struct decoder *decoder = data->decoder;
+	enum decoder_command cmd;
+
+	data->first_frame = t_start;
+
+	while (true) {
+		if (data->tag != nullptr && !tag_is_empty(data->tag)) {
+			cmd = decoder_tag(data->decoder, data->input_stream,
+					  data->tag);
+			tag_free(data->tag);
+			data->tag = tag_new();
+		} else
+			cmd = decoder_get_command(decoder);
+
+		if (cmd == DECODE_COMMAND_SEEK) {
+			FLAC__uint64 seek_sample = t_start +
+				decoder_seek_where(decoder) *
+				data->audio_format.sample_rate;
+			if (seek_sample >= t_start &&
+			    (t_end == 0 || seek_sample <= t_end) &&
+			    FLAC__stream_decoder_seek_absolute(flac_dec, seek_sample)) {
+				data->next_frame = seek_sample;
+				data->position = 0;
+				decoder_command_finished(decoder);
+			} else
+				decoder_seek_error(decoder);
+		} else if (cmd == DECODE_COMMAND_STOP ||
+			   FLAC__stream_decoder_get_state(flac_dec) == FLAC__STREAM_DECODER_END_OF_STREAM)
+			break;
+
+		if (t_end != 0 && data->next_frame >= t_end)
+			/* end of this sub track */
+			break;
+
+		if (!FLAC__stream_decoder_process_single(flac_dec) &&
+		    decoder_get_command(decoder) == DECODE_COMMAND_NONE) {
+			/* a failure that was not triggered by a
+			   decoder command */
+			flacPrintErroredState(FLAC__stream_decoder_get_state(flac_dec));
+			break;
+		}
+	}
+}
+
+static FLAC__StreamDecoderInitStatus
+stream_init_oggflac(FLAC__StreamDecoder *flac_dec, struct flac_data *data)
+{
+	return FLAC__stream_decoder_init_ogg_stream(flac_dec,
+						    FLACInput::Read,
+						    FLACInput::Seek,
+						    FLACInput::Tell,
+						    FLACInput::Length,
+						    FLACInput::Eof,
+						    flac_write_cb,
+						    flacMetadata,
+						    FLACInput::Error,
+						    data);
+}
+
+static FLAC__StreamDecoderInitStatus
+stream_init_flac(FLAC__StreamDecoder *flac_dec, struct flac_data *data)
+{
+	return FLAC__stream_decoder_init_stream(flac_dec,
+						FLACInput::Read,
+						FLACInput::Seek,
+						FLACInput::Tell,
+						FLACInput::Length,
+						FLACInput::Eof,
+						flac_write_cb,
+						flacMetadata,
+						FLACInput::Error,
+						data);
+}
+
+static FLAC__StreamDecoderInitStatus
+stream_init(FLAC__StreamDecoder *flac_dec, struct flac_data *data, bool is_ogg)
+{
+	return is_ogg
+		? stream_init_oggflac(flac_dec, data)
+		: stream_init_flac(flac_dec, data);
+}
+
+static void
+flac_decode_internal(struct decoder * decoder,
+		     struct input_stream *input_stream,
+		     bool is_ogg)
+{
+	FLAC__StreamDecoder *flac_dec;
+
+	flac_dec = flac_decoder_new();
+	if (flac_dec == nullptr)
+		return;
+
+	struct flac_data data(decoder, input_stream);
+	data.tag = tag_new();
+
+	FLAC__StreamDecoderInitStatus status =
+		stream_init(flac_dec, &data, is_ogg);
+	if (status != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
+		FLAC__stream_decoder_delete(flac_dec);
+		g_warning("%s", FLAC__StreamDecoderInitStatusString[status]);
+		return;
+	}
+
+	if (!flac_decoder_initialize(&data, flac_dec, 0)) {
+		FLAC__stream_decoder_finish(flac_dec);
+		FLAC__stream_decoder_delete(flac_dec);
+		return;
+	}
+
+	flac_decoder_loop(&data, flac_dec, 0, 0);
+
+	FLAC__stream_decoder_finish(flac_dec);
+	FLAC__stream_decoder_delete(flac_dec);
+}
+
+static void
+flac_decode(struct decoder * decoder, struct input_stream *input_stream)
+{
+	flac_decode_internal(decoder, input_stream, false);
+}
+
+static bool
+oggflac_init(G_GNUC_UNUSED const struct config_param *param)
+{
+	return !!FLAC_API_SUPPORTS_OGG_FLAC;
+}
+
+static bool
+oggflac_scan_file(const char *file,
+		  const struct tag_handler *handler, void *handler_ctx)
+{
+	FLACMetadataChain chain;
+	if (!chain.ReadOgg(file)) {
+		g_debug("Failed to read OggFLAC tags: %s",
+			chain.GetStatusString());
+		return false;
+	}
+
+	chain.Scan(handler, handler_ctx);
+	return true;
+}
+
+static bool
+oggflac_scan_stream(struct input_stream *is,
+		    const struct tag_handler *handler, void *handler_ctx)
+{
+	FLACMetadataChain chain;
+	if (!chain.ReadOgg(is)) {
+		g_debug("Failed to read OggFLAC tags: %s",
+			chain.GetStatusString());
+		return false;
+	}
+
+	chain.Scan(handler, handler_ctx);
+	return true;
+}
+
+static void
+oggflac_decode(struct decoder *decoder, struct input_stream *input_stream)
+{
+	if (ogg_codec_detect(decoder, input_stream) != OGG_CODEC_FLAC)
+		return;
+
+	/* rewind the stream, because ogg_codec_detect() has
+	   moved it */
+	input_stream_lock_seek(input_stream, 0, SEEK_SET, nullptr);
+
+	flac_decode_internal(decoder, input_stream, true);
+}
+
+static const char *const oggflac_suffixes[] = { "ogg", "oga", nullptr };
+static const char *const oggflac_mime_types[] = {
+	"application/ogg",
+	"application/x-ogg",
+	"audio/ogg",
+	"audio/x-flac+ogg",
+	"audio/x-ogg",
+	nullptr
+};
+
+const struct decoder_plugin oggflac_decoder_plugin = {
+	"oggflac",
+	oggflac_init,
+	nullptr,
+	oggflac_decode,
+	nullptr,
+	oggflac_scan_file,
+	oggflac_scan_stream,
+	nullptr,
+	oggflac_suffixes,
+	oggflac_mime_types,
+};
+
+static const char *const flac_suffixes[] = { "flac", nullptr };
+static const char *const flac_mime_types[] = {
+	"application/flac",
+	"application/x-flac",
+	"audio/flac",
+	"audio/x-flac",
+	nullptr
+};
+
+const struct decoder_plugin flac_decoder_plugin = {
+	"flac",
+	nullptr,
+	nullptr,
+	flac_decode,
+	nullptr,
+	flac_scan_file,
+	flac_scan_stream,
+	nullptr,
+	flac_suffixes,
+	flac_mime_types,
+};