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ffmpeg / libavcodec / mpegaudiodec_float.c @ 2912e87a

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/*
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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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void ff_mpa_synth_filter_float(MPADecodeContext *s, float *synth_buf_ptr,
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                               int *synth_buf_offset,
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                               float *window, int *dither_state,
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                               float *samples, int incr,
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                               float sb_samples[SBLIMIT])
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{
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    float *synth_buf;
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    int offset;
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    offset = *synth_buf_offset;
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    synth_buf = synth_buf_ptr + offset;
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    s->dct.dct32(synth_buf, sb_samples);
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    s->apply_window_mp3(synth_buf, window, dither_state, samples, incr);
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    offset = (offset - 32) & 511;
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    *synth_buf_offset = offset;
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}
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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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static av_cold int decode_end(AVCodecContext * avctx)
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{
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    MPADecodeContext *s = avctx->priv_data;
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    ff_dct_end(&s->dct);
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    return 0;
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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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    decode_end,
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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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    decode_end,
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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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    decode_end,
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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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    decode_end,
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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