| /* |
| * 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 |
| * 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/aacdec.h" |
| #include "aac_defines.h" |
| |
| #include "libavutil/attributes_internal.h" |
| |
| #define ENVELOPE_ADJUSTMENT_OFFSET 2 |
| #define NOISE_FLOOR_OFFSET 6 |
| |
| /** |
| * SBR VLC tables |
| */ |
| enum { |
| T_HUFFMAN_ENV_1_5DB, |
| F_HUFFMAN_ENV_1_5DB, |
| T_HUFFMAN_ENV_BAL_1_5DB, |
| F_HUFFMAN_ENV_BAL_1_5DB, |
| T_HUFFMAN_ENV_3_0DB, |
| F_HUFFMAN_ENV_3_0DB, |
| T_HUFFMAN_ENV_BAL_3_0DB, |
| F_HUFFMAN_ENV_BAL_3_0DB, |
| T_HUFFMAN_NOISE_3_0DB, |
| T_HUFFMAN_NOISE_BAL_3_0DB, |
| }; |
| |
| /** |
| * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98) |
| */ |
| enum { |
| FIXFIX, |
| FIXVAR, |
| VARFIX, |
| VARVAR, |
| }; |
| |
| enum { |
| EXTENSION_ID_PS = 2, |
| }; |
| |
| FF_VISIBILITY_PUSH_HIDDEN |
| /** Initialize SBR. */ |
| void ff_aac_sbr_init(void); |
| void ff_aac_sbr_init_fixed(void); |
| /** |
| * Allocate an ExtChannelElement (if necessary) and |
| * initialize the SBR context contained in it. |
| */ |
| int ff_aac_sbr_ctx_alloc_init(AACDecContext *ac, ChannelElement **che, int id_aac); |
| int ff_aac_sbr_ctx_alloc_init_fixed(AACDecContext *ac, ChannelElement **che, int id_aac); |
| |
| /** Close the SBR context implicitly contained in a ChannelElement. */ |
| void ff_aac_sbr_ctx_close(ChannelElement *che); |
| void ff_aac_sbr_ctx_close_fixed(ChannelElement *che); |
| |
| /** Decode one SBR element. */ |
| int ff_aac_sbr_decode_extension(AACDecContext *ac, ChannelElement *che, |
| GetBitContext *gb, int crc, int cnt, int id_aac); |
| int ff_aac_sbr_decode_extension_fixed(AACDecContext *ac, ChannelElement *che, |
| GetBitContext *gb, int crc, int cnt, int id_aac); |
| |
| /** Apply one SBR element to one AAC element. */ |
| void ff_aac_sbr_apply(AACDecContext *ac, ChannelElement *che, |
| int id_aac, INTFLOAT* L, INTFLOAT* R); |
| void ff_aac_sbr_apply_fixed(AACDecContext *ac, ChannelElement *che, |
| int id_aac, INTFLOAT* L, INTFLOAT* R); |
| |
| FF_VISIBILITY_POP_HIDDEN |
| |
| #endif /* AVCODEC_AACSBR_H */ |