AAC definitions and structures that have been OKed from the SoC AAC decoder

code

Originally committed as revision 14624 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/aac.h

+/*
+ * AAC definitions and structures
+ * Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
+ * Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov 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 aac.h
+ * AAC definitions and structures
+ * @author Oded Shimon  ( ods15 ods15 dyndns org )
+ * @author Maxim Gavrilov ( maxim.gavrilov gmail com )
+ */
+
+#ifndef FFMPEG_AAC_H
+#define FFMPEG_AAC_H
+
+#include "avcodec.h"
+#include "dsputil.h"
+#include "mpeg4audio.h"
+
+#include <stdint.h>
+
+#define AAC_INIT_VLC_STATIC(num, size) \
+    INIT_VLC_STATIC(&vlc_spectral[num], 6, ff_aac_spectral_sizes[num], \
+         ff_aac_spectral_bits[num], sizeof( ff_aac_spectral_bits[num][0]), sizeof( ff_aac_spectral_bits[num][0]), \
+        ff_aac_spectral_codes[num], sizeof(ff_aac_spectral_codes[num][0]), sizeof(ff_aac_spectral_codes[num][0]), \
+        size);
+
+#define IVQUANT_SIZE 1024
+
+enum WindowSequence {
+    ONLY_LONG_SEQUENCE,
+    LONG_START_SEQUENCE,
+    EIGHT_SHORT_SEQUENCE,
+    LONG_STOP_SEQUENCE,
+};
+
+enum ChannelType {
+    AAC_CHANNEL_FRONT = 1,
+    AAC_CHANNEL_SIDE  = 2,
+    AAC_CHANNEL_BACK  = 3,
+    AAC_CHANNEL_LFE   = 4,
+    AAC_CHANNEL_CC    = 5,
+};
+
+/**
+ * main AAC context
+ */
+typedef struct {
+    AVCodecContext * avccontext;
+
+    /**
+     * @defgroup tables   Computed / set up during initialization.
+     * @{
+     */
+    MDCTContext mdct;
+    MDCTContext mdct_small;
+    DSPContext dsp;
+    /** @} */
+
+    /**
+     * @defgroup output   Members used for output interleaving and down-mixing.
+     * @{
+     */
+    float add_bias;                                   ///< offset for dsp.float_to_int16
+    float sf_scale;                                   ///< Pre-scale for correct IMDCT and dsp.float_to_int16.
+    int sf_offset;                                    ///< offset into pow2sf_tab as appropriate for dsp.float_to_int16
+    /** @} */
+
+} AACContext;
+
+#endif /* FFMPEG_AAC_H */