new mpeg audio decoder plugin (libmad) added

CVS patchset: 414
CVS date: 2001/08/12 02:57:55

1 files changed, 123 insertions, 0 deletions

diff --git a/src/libmad/stream.c b/src/libmad/stream.c
new file mode 100644
index 000000000..8e73c043f
--- /dev/null
+++ b/src/libmad/stream.c
@@ -0,0 +1,123 @@
+/*
+ * mad - MPEG audio decoder
+ * Copyright (C) 2000-2001 Robert Leslie
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * $Id: stream.c,v 1.1 2001/08/12 02:57:55 guenter Exp $
+ */
+
+# ifdef HAVE_CONFIG_H
+#  include "config.h"
+# endif
+
+# include "global.h"
+
+# include <stdlib.h>
+
+# include "bit.h"
+# include "stream.h"
+
+/*
+ * NAME:	stream->init()
+ * DESCRIPTION:	initialize stream struct
+ */
+void mad_stream_init(struct mad_stream *stream)
+{
+  stream->buffer     = 0;
+  stream->bufend     = 0;
+  stream->skiplen    = 0;
+
+  stream->sync       = 0;
+  stream->freerate   = 0;
+
+  stream->this_frame = 0;
+  stream->next_frame = 0;
+  mad_bit_init(&stream->ptr, 0);
+
+  mad_bit_init(&stream->anc_ptr, 0);
+  stream->anc_bitlen = 0;
+
+  stream->main_data  = 0;
+  stream->md_len     = 0;
+
+  stream->options    = 0;
+  stream->error      = 0;
+}
+
+/*
+ * NAME:	stream->finish()
+ * DESCRIPTION:	deallocate any dynamic memory associated with stream
+ */
+void mad_stream_finish(struct mad_stream *stream)
+{
+  if (stream->main_data) {
+    free(stream->main_data);
+    stream->main_data = 0;
+  }
+
+  mad_bit_finish(&stream->anc_ptr);
+  mad_bit_finish(&stream->ptr);
+}
+
+/*
+ * NAME:	stream->buffer()
+ * DESCRIPTION:	set stream buffer pointers
+ */
+void mad_stream_buffer(struct mad_stream *stream,
+		       unsigned char const *buffer, unsigned long length)
+{
+  stream->buffer = buffer;
+  stream->bufend = buffer + length;
+
+  stream->this_frame = buffer;
+  stream->next_frame = buffer;
+
+  stream->sync = 1;
+
+  mad_bit_init(&stream->ptr, buffer);
+}
+
+/*
+ * NAME:	stream->skip()
+ * DESCRIPTION:	arrange to skip bytes before the next frame
+ */
+void mad_stream_skip(struct mad_stream *stream, unsigned long length)
+{
+  stream->skiplen += length;
+}
+
+/*
+ * NAME:	stream->sync()
+ * DESCRIPTION:	locate the next stream sync word
+ */
+int mad_stream_sync(struct mad_stream *stream)
+{
+  register unsigned char const *ptr, *end;
+
+  ptr = mad_bit_nextbyte(&stream->ptr);
+  end = stream->bufend;
+
+  while (ptr < end - 1 &&
+	 !(ptr[0] == 0xff && (ptr[1] & 0xe0) == 0xe0))
+    ++ptr;
+
+  if (end - ptr < MAD_BUFFER_GUARD)
+    return -1;
+
+  mad_bit_init(&stream->ptr, ptr);
+
+  return 0;
+}