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/*
* Float MPEG Audio decoder
* Copyright (c) 2010 Michael Niedermayer
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define CONFIG_FLOAT 1
#include "mpegaudiodec.c"
void ff_mpa_synth_filter_float(MPADecodeContext *s, float *synth_buf_ptr,
int *synth_buf_offset,
float *window, int *dither_state,
float *samples, int incr,
float sb_samples[SBLIMIT])
{
float *synth_buf;
int offset;
offset = *synth_buf_offset;
synth_buf = synth_buf_ptr + offset;
s->dct.dct32(synth_buf, sb_samples);
s->apply_window_mp3(synth_buf, window, dither_state, samples, incr);
offset = (offset - 32) & 511;
*synth_buf_offset = offset;
}
static void compute_antialias_float(MPADecodeContext *s,
GranuleDef *g)
{
float *ptr;
int n, i;
/* we antialias only "long" bands */
if (g->block_type == 2) {
if (!g->switch_point)
return;
/* XXX: check this for 8000Hz case */
n = 1;
} else {
n = SBLIMIT - 1;
}
ptr = g->sb_hybrid + 18;
for(i = n;i > 0;i--) {
float tmp0, tmp1;
float *csa = &csa_table_float[0][0];
#define FLOAT_AA(j)\
tmp0= ptr[-1-j];\
tmp1= ptr[ j];\
ptr[-1-j] = tmp0 * csa[0+4*j] - tmp1 * csa[1+4*j];\
ptr[ j] = tmp0 * csa[1+4*j] + tmp1 * csa[0+4*j];
FLOAT_AA(0)
FLOAT_AA(1)
FLOAT_AA(2)
FLOAT_AA(3)
FLOAT_AA(4)
FLOAT_AA(5)
FLOAT_AA(6)
FLOAT_AA(7)
ptr += 18;
}
}
static av_cold int decode_end(AVCodecContext * avctx)
{
MPADecodeContext *s = avctx->priv_data;
ff_dct_end(&s->dct);
return 0;
}
#if CONFIG_MP1FLOAT_DECODER
AVCodec ff_mp1float_decoder =
{
"mp1float",
AVMEDIA_TYPE_AUDIO,
CODEC_ID_MP1,
sizeof(MPADecodeContext),
decode_init,
NULL,
decode_end,
decode_frame,
CODEC_CAP_PARSE_ONLY,
.flush= flush,
.long_name= NULL_IF_CONFIG_SMALL("MP1 (MPEG audio layer 1)"),
};
#endif
#if CONFIG_MP2FLOAT_DECODER
AVCodec ff_mp2float_decoder =
{
"mp2float",
AVMEDIA_TYPE_AUDIO,
CODEC_ID_MP2,
sizeof(MPADecodeContext),
decode_init,
NULL,
decode_end,
decode_frame,
CODEC_CAP_PARSE_ONLY,
.flush= flush,
.long_name= NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
};
#endif
#if CONFIG_MP3FLOAT_DECODER
AVCodec ff_mp3float_decoder =
{
"mp3float",
AVMEDIA_TYPE_AUDIO,
CODEC_ID_MP3,
sizeof(MPADecodeContext),
decode_init,
NULL,
decode_end,
decode_frame,
CODEC_CAP_PARSE_ONLY,
.flush= flush,
.long_name= NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
};
#endif
#if CONFIG_MP3ADUFLOAT_DECODER
AVCodec ff_mp3adufloat_decoder =
{
"mp3adufloat",
AVMEDIA_TYPE_AUDIO,
CODEC_ID_MP3ADU,
sizeof(MPADecodeContext),
decode_init,
NULL,
decode_end,
decode_frame_adu,
CODEC_CAP_PARSE_ONLY,
.flush= flush,
.long_name= NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"),
};
#endif
#if CONFIG_MP3ON4FLOAT_DECODER
AVCodec ff_mp3on4float_decoder =
{
"mp3on4float",
AVMEDIA_TYPE_AUDIO,
CODEC_ID_MP3ON4,
sizeof(MP3On4DecodeContext),
decode_init_mp3on4,
NULL,
decode_close_mp3on4,
decode_frame_mp3on4,
.flush= flush,
.long_name= NULL_IF_CONFIG_SMALL("MP3onMP4"),
};
#endif
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