Add an HE-AAC v1 decoder.

A large portion of this code was orignally authored by Robert Swain. The rest
was written by me. Full history is available at:
svn://svn.ffmpeg.org/soc/aac-sbr
http://github.com/aconverse/ffmpeg-heaac/tree/sbr_pub

Originally committed as revision 22316 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 51 insertions, 0 deletions

diff --git a/libavcodec/aacsbr.h b/libavcodec/aacsbr.h
new file mode 100644
index 0000000000..c865371b15
--- /dev/null
+++ b/libavcodec/aacsbr.h
@@ -0,0 +1,51 @@
+/*
+ * AAC Spectral Band Replication function declarations
+ * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
+ * Copyright (c) 2010      Alex Converse <alex.converse@gmail.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file libavcodec/aacsbr.h
+ * AAC Spectral Band Replication function declarations
+ * @author Robert Swain ( rob opendot cl )
+ */
+
+#ifndef AVCODEC_AACSBR_H
+#define AVCODEC_AACSBR_H
+
+#include "get_bits.h"
+#include "aac.h"
+#include "sbr.h"
+
+/** Initialize SBR. */
+av_cold void ff_aac_sbr_init(void);
+/** Initialize one SBR context. */
+av_cold void ff_aac_sbr_ctx_init(SpectralBandReplication *sbr);
+/** Close one SBR context. */
+av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr);
+/** Decode one SBR element. */
+int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
+                            GetBitContext *gb, int crc, int cnt, int id_aac);
+/** Dequantized all channels in one SBR element. */
+void ff_sbr_dequant(AACContext *ac, SpectralBandReplication *sbr, int id_aac);
+/** Apply dequantized SBR to a single AAC channel. */
+void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int ch,
+                  const float* in, float* out);
+
+#endif /* AVCODEC_AACSBR_H */