Split up tracklength module into separate files for each file format.

[disorder] / plugins / tracklength-flac.c

diff --git a/plugins/tracklength-flac.c b/plugins/tracklength-flac.c
new file mode 100644 (file)
index 0000000..a838966
--- /dev/null
+++ b/plugins/tracklength-flac.c
@@ -0,0 +1,97 @@
+/*
+ * This file is part of DisOrder.
+ * Copyright (C) 2004, 2005, 2007 Richard Kettlewell
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+/** @file plugins/tracklength-flac.c
+ * @brief Compute track lengths for FLAC files
+ */
+#include "tracklength.h"
+#include <FLAC/stream_decoder.h>
+
+/* libFLAC's "simplified" interface is rather heavyweight... */
+
+struct flac_state {
+  long duration;
+  const char *path;
+};
+
+static void flac_metadata(const FLAC__StreamDecoder attribute((unused)) *decoder,
+                         const FLAC__StreamMetadata *metadata,
+                         void *client_data) {
+  struct flac_state *const state = client_data;
+  const FLAC__StreamMetadata_StreamInfo *const stream_info
+    = &metadata->data.stream_info;
+
+  if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO)
+    /* FLAC uses 0 to mean unknown and conveniently so do we */
+    state->duration = (stream_info->total_samples
+                      + stream_info->sample_rate - 1)
+           / stream_info->sample_rate;
+}
+
+static void flac_error(const FLAC__StreamDecoder attribute((unused)) *decoder,
+                      FLAC__StreamDecoderErrorStatus status,
+                      void *client_data) {
+  const struct flac_state *const state = client_data;
+
+  disorder_error(0, "error decoding %s: %s", state->path,
+                FLAC__StreamDecoderErrorStatusString[status]);
+}
+
+static FLAC__StreamDecoderWriteStatus flac_write
+    (const FLAC__StreamDecoder attribute((unused)) *decoder,
+     const FLAC__Frame attribute((unused)) *frame,
+     const FLAC__int32 attribute((unused)) *const buffer_[],
+     void attribute((unused)) *client_data) {
+  const struct flac_state *const state = client_data;
+
+  if(state->duration >= 0)
+    return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
+  else
+    return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
+}
+
+long tl_flac(const char *path) {
+  FLAC__StreamDecoder *sd = 0;
+  FLAC__StreamDecoderInitStatus is;
+  struct flac_state state[1];
+
+  state->duration = -1;                        /* error */
+  state->path = path;
+  if(!(sd = FLAC__stream_decoder_new())) {
+    disorder_error(0, "FLAC__stream_decoder_new failed");
+    goto fail;
+  }
+  if((is = FLAC__stream_decoder_init_file(sd, path, flac_write, flac_metadata,
+                                         flac_error, state))) {
+    disorder_error(0, "FLAC__stream_decoder_init_file %s: %s",
+                  path, FLAC__StreamDecoderInitStatusString[is]);
+    goto fail;
+  }
+  FLAC__stream_decoder_process_until_end_of_metadata(sd);
+fail:
+  if(sd)
+    FLAC__stream_decoder_delete(sd);
+  return state->duration;
+}
+
+/*
+Local Variables:
+c-basic-offset:2
+comment-column:40
+fill-column:79
+End:
+*/