3 * Copyright (c) 2006 Konstantin Shishkov
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
26 * divided into 32 subbands.
32 #include "libavutil/lfg.h"
36 #include "mpegaudio.h"
37 #include "mpegaudiodsp.h"
40 #define SAMPLES_PER_BAND 36
41 #define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND)
43 /** Subband structure - hold all variables for each subband */
45 int msf
; ///< mid-stereo flag
52 typedef struct MPCContext
{
58 int maxbands
, last_max_band
;
60 int oldDSCF
[2][BANDS
];
62 int Q
[2][MPC_FRAME_SIZE
];
63 int cur_frame
, frames
;
69 DECLARE_ALIGNED(16, MPA_INT
, synth_buf
)[MPA_MAX_CHANNELS
][512*2];
70 int synth_buf_offset
[MPA_MAX_CHANNELS
];
71 DECLARE_ALIGNED(16, int32_t, sb_samples
)[MPA_MAX_CHANNELS
][36][SBLIMIT
];
74 void ff_mpc_init(void);
75 void ff_mpc_dequantize_and_synth(MPCContext
*c
, int maxband
, int16_t **out
, int channels
);
77 #endif /* AVCODEC_MPC_H */