Split up disorder-decode source into one file per format.

[disorder] / server / decode-flac.c

diff --git a/server/decode-flac.c b/server/decode-flac.c
new file mode 100644 (file)
index 0000000..f1399fb
--- /dev/null
+++ b/server/decode-flac.c
@@ -0,0 +1,156 @@
+/*
+ * This file is part of DisOrder
+ * Copyright (C) 2007-2010 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 server/decode.c
+ * @brief General-purpose decoder for use by speaker process
+ */
+#include "decode.h"
+#include <FLAC/stream_decoder.h>
+
+/** @brief Metadata callback for FLAC decoder
+ *
+ * This is a no-op here.
+ */
+static void flac_metadata(const FLAC__StreamDecoder attribute((unused)) *decoder,
+                         const FLAC__StreamMetadata attribute((unused)) *metadata,
+                         void attribute((unused)) *client_data) {
+}
+
+/** @brief Error callback for FLAC decoder */
+static void flac_error(const FLAC__StreamDecoder attribute((unused)) *decoder,
+                      FLAC__StreamDecoderErrorStatus status,
+                      void attribute((unused)) *client_data) {
+  disorder_fatal(0, "error decoding %s: %s", path,
+                 FLAC__StreamDecoderErrorStatusString[status]);
+}
+
+/** @brief Write callback for FLAC decoder */
+static FLAC__StreamDecoderWriteStatus flac_write
+    (const FLAC__StreamDecoder attribute((unused)) *decoder,
+     const FLAC__Frame *frame,
+     const FLAC__int32 *const buffer[],
+     void attribute((unused)) *client_data) {
+  size_t n, c;
+
+  output_header(frame->header.sample_rate,
+                frame->header.channels,
+                frame->header.bits_per_sample,
+                (frame->header.channels * frame->header.blocksize
+                 * frame->header.bits_per_sample) / 8,
+                ENDIAN_BIG);
+  for(n = 0; n < frame->header.blocksize; ++n) {
+    for(c = 0; c < frame->header.channels; ++c) {
+      switch(frame->header.bits_per_sample) {
+      case 8: output_8(buffer[c][n]); break;
+      case 16: output_16(buffer[c][n]); break;
+      case 24: output_24(buffer[c][n]); break;
+      case 32: output_32(buffer[c][n]); break;
+      }
+    }
+  }
+  return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
+}
+
+static FLAC__StreamDecoderReadStatus flac_read(const FLAC__StreamDecoder attribute((unused)) *decoder,
+                                               FLAC__byte buffer[],
+                                               size_t *bytes,
+                                               void *client_data) {
+  struct hreader *flacinput = client_data;
+  int n = hreader_read(flacinput, buffer, *bytes);
+  if(n == 0) {
+    *bytes = 0;
+    return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
+  }
+  if(n < 0) {
+    *bytes = 0;
+    return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
+  }
+  *bytes = n;
+  return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
+}
+
+static FLAC__StreamDecoderSeekStatus flac_seek(const FLAC__StreamDecoder attribute((unused)) *decoder,
+                                               FLAC__uint64 absolute_byte_offset, 
+                                               void *client_data) {
+  struct hreader *flacinput = client_data;
+  if(hreader_seek(flacinput, absolute_byte_offset, SEEK_SET) < 0)
+    return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
+  else
+    return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
+}
+
+static FLAC__StreamDecoderTellStatus flac_tell(const FLAC__StreamDecoder attribute((unused)) *decoder, 
+                                               FLAC__uint64 *absolute_byte_offset,
+                                               void *client_data) {
+  struct hreader *flacinput = client_data;
+  off_t offset = hreader_seek(flacinput, 0, SEEK_CUR);
+  if(offset < 0)
+    return FLAC__STREAM_DECODER_TELL_STATUS_ERROR;
+  *absolute_byte_offset = offset;
+  return FLAC__STREAM_DECODER_TELL_STATUS_OK;
+}
+
+static FLAC__StreamDecoderLengthStatus flac_length(const FLAC__StreamDecoder attribute((unused)) *decoder, 
+                                                   FLAC__uint64 *stream_length, 
+                                                   void *client_data) {
+  struct hreader *flacinput = client_data;
+  *stream_length = hreader_size(flacinput);
+  return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
+}
+
+static FLAC__bool flac_eof(const FLAC__StreamDecoder attribute((unused)) *decoder, 
+                           void *client_data) {
+  struct hreader *flacinput = client_data;
+  return hreader_eof(flacinput);
+}
+
+/** @brief FLAC file decoder */
+void decode_flac(void) {
+  FLAC__StreamDecoder *sd = FLAC__stream_decoder_new();
+  FLAC__StreamDecoderInitStatus is;
+  struct hreader flacinput[1];
+
+  if (!sd)
+    disorder_fatal(0, "FLAC__stream_decoder_new failed");
+  if(hreader_init(path, flacinput))
+    disorder_fatal(errno, "error opening %s", path);
+
+  if((is = FLAC__stream_decoder_init_stream(sd,
+                                            flac_read,
+                                            flac_seek,
+                                            flac_tell,
+                                            flac_length,
+                                            flac_eof,
+                                            flac_write, flac_metadata,
+                                            flac_error, 
+                                            flacinput)))
+    disorder_fatal(0, "FLAC__stream_decoder_init_stream %s: %s",
+                   path, FLAC__StreamDecoderInitStatusString[is]);
+
+  FLAC__stream_decoder_process_until_end_of_stream(sd);
+  FLAC__stream_decoder_finish(sd);
+  FLAC__stream_decoder_delete(sd);
+}
+
+/*
+Local Variables:
+c-basic-offset:2
+comment-column:40
+fill-column:79
+indent-tabs-mode:nil
+End:
+*/