From f40bfc9267b13b54e6379dfe7539447662879d24 Mon Sep 17 00:00:00 2001 From: Sean Bartell Date: Sat, 25 Jun 2011 21:32:25 -0400 Subject: Add codecs to librbcodec. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97 Reviewed-on: http://gerrit.rockbox.org/137 Reviewed-by: Nils Wallménius Tested-by: Nils Wallménius --- lib/rbcodec/codecs/libfaad/ms.c | 73 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 lib/rbcodec/codecs/libfaad/ms.c (limited to 'lib/rbcodec/codecs/libfaad/ms.c') diff --git a/lib/rbcodec/codecs/libfaad/ms.c b/lib/rbcodec/codecs/libfaad/ms.c new file mode 100644 index 0000000000..b42e95a408 --- /dev/null +++ b/lib/rbcodec/codecs/libfaad/ms.c @@ -0,0 +1,73 @@ +/* +** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding +** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com +** +** 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. +** +** Any non-GPL usage of this software or parts of this software is strictly +** forbidden. +** +** Commercial non-GPL licensing of this software is possible. +** For more info contact Ahead Software through Mpeg4AAClicense@nero.com. +** +** $Id$ +**/ + +#include "common.h" +#include "structs.h" + +#include "syntax.h" +#include "ms.h" +#include "is.h" +#include "pns.h" + +void ms_decode(ic_stream *ics, ic_stream *icsr, real_t *l_spec, real_t *r_spec, + uint16_t frame_len) +{ + uint8_t g, b, sfb; + uint8_t group = 0; + uint16_t nshort = frame_len/8; + + uint16_t i, k; + + if (ics->ms_mask_present >= 1) + { + for (g = 0; g < ics->num_window_groups; g++) + { + for (b = 0; b < ics->window_group_length[g]; b++) + { + for (sfb = 0; sfb < ics->max_sfb; sfb++) + { + /* If intensity stereo coding or noise substitution is on + for a particular scalefactor band, no M/S stereo decoding + is carried out. + */ + if ((ics->ms_used[g][sfb] || ics->ms_mask_present == 2) && + !is_intensity(icsr, g, sfb) && !is_noise(ics, g, sfb)) + { + k = (group*nshort) + ics->swb_offset[sfb]; + for (i = ics->swb_offset[sfb]; i < ics->swb_offset[sfb+1]; i++, k++) + { + /* L' = L+R, R' = L-R */ + l_spec[k] = l_spec[k] + r_spec[k]; + r_spec[k] = l_spec[k] - (r_spec[k]<<1); + } + } + } + group++; + } + } + } +} -- cgit v1.2.3