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142 lines
3.4 KiB
142 lines
3.4 KiB
/* |
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* Float MPEG Audio decoder |
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* Copyright (c) 2010 Michael Niedermayer |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#define CONFIG_FLOAT 1 |
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#include "mpegaudiodec.c" |
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static void compute_antialias_float(MPADecodeContext *s, |
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GranuleDef *g) |
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{ |
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float *ptr; |
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int n, i; |
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/* we antialias only "long" bands */ |
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if (g->block_type == 2) { |
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if (!g->switch_point) |
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return; |
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/* XXX: check this for 8000Hz case */ |
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n = 1; |
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} else { |
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n = SBLIMIT - 1; |
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} |
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ptr = g->sb_hybrid + 18; |
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for(i = n;i > 0;i--) { |
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float tmp0, tmp1; |
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float *csa = &csa_table_float[0][0]; |
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#define FLOAT_AA(j)\ |
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tmp0= ptr[-1-j];\ |
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tmp1= ptr[ j];\ |
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ptr[-1-j] = tmp0 * csa[0+4*j] - tmp1 * csa[1+4*j];\ |
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ptr[ j] = tmp0 * csa[1+4*j] + tmp1 * csa[0+4*j]; |
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FLOAT_AA(0) |
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FLOAT_AA(1) |
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FLOAT_AA(2) |
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FLOAT_AA(3) |
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FLOAT_AA(4) |
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FLOAT_AA(5) |
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FLOAT_AA(6) |
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FLOAT_AA(7) |
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ptr += 18; |
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} |
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} |
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#if CONFIG_MP1FLOAT_DECODER |
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AVCodec ff_mp1float_decoder = |
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{ |
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"mp1float", |
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AVMEDIA_TYPE_AUDIO, |
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CODEC_ID_MP1, |
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sizeof(MPADecodeContext), |
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decode_init, |
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NULL, |
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.close = NULL, |
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decode_frame, |
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CODEC_CAP_PARSE_ONLY, |
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.flush= flush, |
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.long_name= NULL_IF_CONFIG_SMALL("MP1 (MPEG audio layer 1)"), |
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}; |
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#endif |
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#if CONFIG_MP2FLOAT_DECODER |
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AVCodec ff_mp2float_decoder = |
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{ |
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"mp2float", |
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AVMEDIA_TYPE_AUDIO, |
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CODEC_ID_MP2, |
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sizeof(MPADecodeContext), |
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decode_init, |
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NULL, |
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.close = NULL, |
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decode_frame, |
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CODEC_CAP_PARSE_ONLY, |
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.flush= flush, |
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.long_name= NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"), |
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}; |
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#endif |
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#if CONFIG_MP3FLOAT_DECODER |
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AVCodec ff_mp3float_decoder = |
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{ |
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"mp3float", |
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AVMEDIA_TYPE_AUDIO, |
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CODEC_ID_MP3, |
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sizeof(MPADecodeContext), |
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decode_init, |
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NULL, |
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.close = NULL, |
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decode_frame, |
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CODEC_CAP_PARSE_ONLY, |
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.flush= flush, |
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.long_name= NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"), |
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}; |
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#endif |
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#if CONFIG_MP3ADUFLOAT_DECODER |
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AVCodec ff_mp3adufloat_decoder = |
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{ |
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"mp3adufloat", |
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AVMEDIA_TYPE_AUDIO, |
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CODEC_ID_MP3ADU, |
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sizeof(MPADecodeContext), |
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decode_init, |
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NULL, |
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.close = NULL, |
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decode_frame_adu, |
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CODEC_CAP_PARSE_ONLY, |
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.flush= flush, |
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.long_name= NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"), |
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}; |
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#endif |
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#if CONFIG_MP3ON4FLOAT_DECODER |
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AVCodec ff_mp3on4float_decoder = |
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{ |
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"mp3on4float", |
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AVMEDIA_TYPE_AUDIO, |
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CODEC_ID_MP3ON4, |
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sizeof(MP3On4DecodeContext), |
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decode_init_mp3on4, |
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NULL, |
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decode_close_mp3on4, |
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decode_frame_mp3on4, |
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.flush= flush, |
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.long_name= NULL_IF_CONFIG_SMALL("MP3onMP4"), |
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}; |
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#endif
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