mirror of https://git.ffmpeg.org/ffmpeg.git
143 lines
3.4 KiB
C
143 lines
3.4 KiB
C
/*
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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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