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104 lines
3.2 KiB
104 lines
3.2 KiB
/* |
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* Musepack decoder core |
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* Copyright (c) 2006 Konstantin Shishkov |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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/** |
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* @file mpc.c Musepack decoder core |
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* MPEG Audio Layer 1/2 -like codec with frames of 1152 samples |
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* divided into 32 subbands. |
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*/ |
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#include "libavutil/random.h" |
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#include "avcodec.h" |
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#include "bitstream.h" |
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#include "dsputil.h" |
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#include "mpegaudio.h" |
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#include "mpc.h" |
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#include "mpcdata.h" |
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static DECLARE_ALIGNED_16(MPA_INT, mpa_window[512]); |
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void ff_mpc_init(void) |
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{ |
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ff_mpa_synth_init(mpa_window); |
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} |
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/** |
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* Process decoded Musepack data and produce PCM |
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*/ |
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static void mpc_synth(MPCContext *c, int16_t *out) |
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{ |
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int dither_state = 0; |
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int i, ch; |
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OUT_INT samples[MPA_MAX_CHANNELS * MPA_FRAME_SIZE], *samples_ptr; |
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for(ch = 0; ch < 2; ch++){ |
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samples_ptr = samples + ch; |
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for(i = 0; i < SAMPLES_PER_BAND; i++) { |
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ff_mpa_synth_filter(c->synth_buf[ch], &(c->synth_buf_offset[ch]), |
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mpa_window, &dither_state, |
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samples_ptr, 2, |
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c->sb_samples[ch][i]); |
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samples_ptr += 64; |
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} |
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} |
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for(i = 0; i < MPC_FRAME_SIZE*2; i++) |
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*out++=samples[i]; |
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} |
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void ff_mpc_dequantize_and_synth(MPCContext * c, int maxband, void *data) |
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{ |
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int i, j, ch; |
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Band *bands = c->bands; |
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int off; |
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float mul; |
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/* dequantize */ |
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memset(c->sb_samples, 0, sizeof(c->sb_samples)); |
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off = 0; |
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for(i = 0; i <= maxband; i++, off += SAMPLES_PER_BAND){ |
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for(ch = 0; ch < 2; ch++){ |
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if(bands[i].res[ch]){ |
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j = 0; |
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mul = mpc_CC[bands[i].res[ch]] * mpc_SCF[bands[i].scf_idx[ch][0]]; |
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for(; j < 12; j++) |
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c->sb_samples[ch][j][i] = mul * c->Q[ch][j + off]; |
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mul = mpc_CC[bands[i].res[ch]] * mpc_SCF[bands[i].scf_idx[ch][1]]; |
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for(; j < 24; j++) |
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c->sb_samples[ch][j][i] = mul * c->Q[ch][j + off]; |
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mul = mpc_CC[bands[i].res[ch]] * mpc_SCF[bands[i].scf_idx[ch][2]]; |
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for(; j < 36; j++) |
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c->sb_samples[ch][j][i] = mul * c->Q[ch][j + off]; |
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} |
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} |
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if(bands[i].msf){ |
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int t1, t2; |
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for(j = 0; j < SAMPLES_PER_BAND; j++){ |
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t1 = c->sb_samples[0][j][i]; |
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t2 = c->sb_samples[1][j][i]; |
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c->sb_samples[0][j][i] = t1 + t2; |
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c->sb_samples[1][j][i] = t1 - t2; |
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} |
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} |
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} |
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mpc_synth(c, data); |
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}
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