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399 lines
13 KiB
399 lines
13 KiB
/* |
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* Musepack SV8 decoder |
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* Copyright (c) 2007 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 |
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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/channel_layout.h" |
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#include "libavutil/lfg.h" |
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#include "libavutil/thread.h" |
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#include "avcodec.h" |
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#include "codec_internal.h" |
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#include "get_bits.h" |
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#include "internal.h" |
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#include "mpegaudiodsp.h" |
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#include "mpc.h" |
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#include "mpc8data.h" |
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#include "mpc8huff.h" |
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static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2]; |
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static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc; |
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static inline int mpc8_dec_base(GetBitContext *gb, int k, int n) |
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{ |
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int len = mpc8_cnk_len[k-1][n-1] - 1; |
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int code = len ? get_bits_long(gb, len) : 0; |
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if (code >= mpc8_cnk_lost[k-1][n-1]) |
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code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1]; |
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return code; |
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} |
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static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n) |
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{ |
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int bits = 0; |
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const uint32_t * C = mpc8_cnk[k-1]; |
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int code = mpc8_dec_base(gb, k, n); |
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do { |
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n--; |
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if (code >= C[n]) { |
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bits |= 1U << n; |
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code -= C[n]; |
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C -= 32; |
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k--; |
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} |
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} while(k > 0); |
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return bits; |
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} |
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static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m) |
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{ |
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if(mpc8_cnk_len[0][m] < 1) return 0; |
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return mpc8_dec_base(gb, 1, m+1); |
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} |
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static int mpc8_get_mask(GetBitContext *gb, int size, int t) |
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{ |
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int mask = 0; |
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if(t && t != size) |
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mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size); |
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if((t << 1) > size) mask = ~mask; |
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return mask; |
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} |
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static av_cold void build_vlc(VLC *vlc, unsigned *buf_offset, |
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const uint8_t codes_counts[16], |
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const uint8_t **syms, int offset) |
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{ |
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static VLC_TYPE vlc_buf[9296][2]; |
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uint8_t len[MPC8_MAX_VLC_SIZE]; |
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unsigned num = 0; |
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vlc->table = &vlc_buf[*buf_offset]; |
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vlc->table_allocated = FF_ARRAY_ELEMS(vlc_buf) - *buf_offset; |
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for (int i = 16; i > 0; i--) |
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for (unsigned tmp = num + codes_counts[i - 1]; num < tmp; num++) |
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len[num] = i; |
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ff_init_vlc_from_lengths(vlc, FFMIN(len[0], 9), num, len, 1, |
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*syms, 1, 1, offset, INIT_VLC_STATIC_OVERLONG, NULL); |
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*buf_offset += vlc->table_size; |
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*syms += num; |
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} |
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static av_cold void mpc8_init_static(void) |
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{ |
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const uint8_t *q_syms = mpc8_q_syms, *bands_syms = mpc8_bands_syms; |
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const uint8_t *res_syms = mpc8_res_syms, *scfi_syms = mpc8_scfi_syms; |
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const uint8_t *dscf_syms = mpc8_dscf_syms; |
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unsigned offset = 0; |
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build_vlc(&band_vlc, &offset, mpc8_bands_len_counts, &bands_syms, 0); |
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build_vlc(&q1_vlc, &offset, mpc8_q1_len_counts, &q_syms, 0); |
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build_vlc(&q9up_vlc, &offset, mpc8_q9up_len_counts, &q_syms, 0); |
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for (int i = 0; i < 2; i++){ |
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build_vlc(&scfi_vlc[i], &offset, mpc8_scfi_len_counts[i], &scfi_syms, 0); |
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build_vlc(&dscf_vlc[i], &offset, mpc8_dscf_len_counts[i], &dscf_syms, 0); |
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build_vlc(&res_vlc[i], &offset, mpc8_res_len_counts[i], &res_syms, 0); |
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build_vlc(&q2_vlc[i], &offset, mpc8_q2_len_counts[i], &q_syms, 0); |
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build_vlc(&q3_vlc[i], &offset, mpc8_q34_len_counts[i], |
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&q_syms, -48 - 16 * i); |
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for (int j = 0; j < 4; j++) |
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build_vlc(&quant_vlc[j][i], &offset, mpc8_q5_8_len_counts[i][j], |
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&q_syms, -((8 << j) - 1)); |
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} |
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ff_mpa_synth_init_fixed(); |
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} |
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static av_cold int mpc8_decode_init(AVCodecContext * avctx) |
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{ |
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static AVOnce init_static_once = AV_ONCE_INIT; |
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MPCContext *c = avctx->priv_data; |
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GetBitContext gb; |
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int channels; |
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if(avctx->extradata_size < 2){ |
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av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size); |
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return -1; |
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} |
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memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); |
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av_lfg_init(&c->rnd, 0xDEADBEEF); |
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ff_mpadsp_init(&c->mpadsp); |
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init_get_bits(&gb, avctx->extradata, 16); |
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skip_bits(&gb, 3);//sample rate |
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c->maxbands = get_bits(&gb, 5) + 1; |
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if (c->maxbands >= BANDS) { |
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av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands); |
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return AVERROR_INVALIDDATA; |
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} |
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channels = get_bits(&gb, 4) + 1; |
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if (channels > 2) { |
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avpriv_request_sample(avctx, "Multichannel MPC SV8"); |
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return AVERROR_PATCHWELCOME; |
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} |
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c->MSS = get_bits1(&gb); |
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c->frames = 1 << (get_bits(&gb, 3) * 2); |
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avctx->sample_fmt = AV_SAMPLE_FMT_S16P; |
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av_channel_layout_uninit(&avctx->ch_layout); |
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av_channel_layout_default(&avctx->ch_layout, channels); |
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ff_thread_once(&init_static_once, mpc8_init_static); |
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return 0; |
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} |
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static int mpc8_decode_frame(AVCodecContext *avctx, AVFrame *frame, |
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int *got_frame_ptr, AVPacket *avpkt) |
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{ |
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const uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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MPCContext *c = avctx->priv_data; |
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GetBitContext gb2, *gb = &gb2; |
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int i, j, k, ch, cnt, res, t; |
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Band *bands = c->bands; |
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int off; |
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int maxband, keyframe; |
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int last[2]; |
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keyframe = c->cur_frame == 0; |
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if(keyframe){ |
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memset(c->Q, 0, sizeof(c->Q)); |
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c->last_bits_used = 0; |
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} |
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if ((res = init_get_bits8(gb, buf, buf_size)) < 0) |
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return res; |
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skip_bits(gb, c->last_bits_used & 7); |
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if(keyframe) |
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maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1); |
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else{ |
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maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2); |
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if(maxband > 32) maxband -= 33; |
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} |
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if (get_bits_left(gb) < 0) { |
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*got_frame_ptr = 0; |
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return buf_size; |
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} |
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if(maxband > c->maxbands + 1) { |
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av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband); |
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return AVERROR_INVALIDDATA; |
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} |
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c->last_max_band = maxband; |
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/* read subband indexes */ |
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if(maxband){ |
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last[0] = last[1] = 0; |
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for(i = maxband - 1; i >= 0; i--){ |
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for(ch = 0; ch < 2; ch++){ |
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last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch]; |
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if(last[ch] > 15) last[ch] -= 17; |
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bands[i].res[ch] = last[ch]; |
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} |
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} |
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if(c->MSS){ |
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int mask; |
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cnt = 0; |
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for(i = 0; i < maxband; i++) |
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if(bands[i].res[0] || bands[i].res[1]) |
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cnt++; |
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t = mpc8_get_mod_golomb(gb, cnt); |
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mask = mpc8_get_mask(gb, cnt, t); |
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for(i = maxband - 1; i >= 0; i--) |
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if(bands[i].res[0] || bands[i].res[1]){ |
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bands[i].msf = mask & 1; |
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mask >>= 1; |
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} |
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} |
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} |
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for(i = maxband; i < c->maxbands; i++) |
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bands[i].res[0] = bands[i].res[1] = 0; |
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if(keyframe){ |
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for(i = 0; i < 32; i++) |
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c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1; |
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} |
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for(i = 0; i < maxband; i++){ |
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if(bands[i].res[0] || bands[i].res[1]){ |
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cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1; |
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if(cnt >= 0){ |
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t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1); |
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if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt); |
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if(bands[i].res[1]) bands[i].scfi[1] = t & 3; |
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} |
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} |
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} |
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for(i = 0; i < maxband; i++){ |
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for(ch = 0; ch < 2; ch++){ |
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if(!bands[i].res[ch]) continue; |
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if(c->oldDSCF[ch][i]){ |
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bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6; |
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c->oldDSCF[ch][i] = 0; |
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}else{ |
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t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2); |
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if(t == 64) |
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t += get_bits(gb, 6); |
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bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6; |
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} |
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for(j = 0; j < 2; j++){ |
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if((bands[i].scfi[ch] << j) & 2) |
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bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j]; |
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else{ |
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t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2); |
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if(t == 31) |
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t = 64 + get_bits(gb, 6); |
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bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6; |
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} |
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} |
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} |
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} |
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for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){ |
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for(ch = 0; ch < 2; ch++){ |
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res = bands[i].res[ch]; |
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switch(res){ |
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case -1: |
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for(j = 0; j < SAMPLES_PER_BAND; j++) |
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c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510; |
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break; |
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case 0: |
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break; |
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case 1: |
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for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){ |
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cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2); |
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t = mpc8_get_mask(gb, 18, cnt); |
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for(k = 0; k < SAMPLES_PER_BAND / 2; k++) |
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c->Q[ch][off + j + k] = t & (1 << (SAMPLES_PER_BAND / 2 - k - 1)) |
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? (get_bits1(gb) << 1) - 1 : 0; |
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} |
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break; |
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case 2: |
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cnt = 6;//2*mpc8_thres[res] |
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for(j = 0; j < SAMPLES_PER_BAND; j += 3){ |
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t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2); |
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c->Q[ch][off + j + 0] = mpc8_idx50[t]; |
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c->Q[ch][off + j + 1] = mpc8_idx51[t]; |
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c->Q[ch][off + j + 2] = mpc8_idx52[t]; |
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cnt = (cnt >> 1) + mpc8_huffq2[t]; |
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} |
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break; |
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case 3: |
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case 4: |
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for(j = 0; j < SAMPLES_PER_BAND; j += 2){ |
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t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2); |
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c->Q[ch][off + j + 1] = t >> 4; |
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c->Q[ch][off + j + 0] = sign_extend(t, 4); |
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} |
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break; |
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case 5: |
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case 6: |
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case 7: |
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case 8: |
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cnt = 2 * mpc8_thres[res]; |
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for(j = 0; j < SAMPLES_PER_BAND; j++){ |
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const VLC *vlc = &quant_vlc[res - 5][cnt > mpc8_thres[res]]; |
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c->Q[ch][off + j] = get_vlc2(gb, vlc->table, vlc->bits, 2); |
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cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]); |
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} |
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break; |
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default: |
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for(j = 0; j < SAMPLES_PER_BAND; j++){ |
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c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2); |
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if(res != 9){ |
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c->Q[ch][off + j] <<= res - 9; |
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c->Q[ch][off + j] |= get_bits(gb, res - 9); |
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} |
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c->Q[ch][off + j] -= (1 << (res - 2)) - 1; |
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} |
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} |
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} |
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} |
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frame->nb_samples = MPC_FRAME_SIZE; |
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if ((res = ff_get_buffer(avctx, frame, 0)) < 0) |
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return res; |
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ff_mpc_dequantize_and_synth(c, maxband - 1, |
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(int16_t **)frame->extended_data, |
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avctx->ch_layout.nb_channels); |
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c->cur_frame++; |
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c->last_bits_used = get_bits_count(gb); |
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if(c->cur_frame >= c->frames) |
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c->cur_frame = 0; |
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if (get_bits_left(gb) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb)); |
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c->last_bits_used = buf_size << 3; |
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} else if (c->cur_frame == 0 && get_bits_left(gb) < 8) {// we have only padding left |
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c->last_bits_used = buf_size << 3; |
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} |
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*got_frame_ptr = 1; |
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return c->cur_frame ? c->last_bits_used >> 3 : buf_size; |
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} |
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static av_cold void mpc8_decode_flush(AVCodecContext *avctx) |
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{ |
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MPCContext *c = avctx->priv_data; |
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c->cur_frame = 0; |
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} |
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const FFCodec ff_mpc8_decoder = { |
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.p.name = "mpc8", |
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.p.long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"), |
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.p.type = AVMEDIA_TYPE_AUDIO, |
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.p.id = AV_CODEC_ID_MUSEPACK8, |
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.priv_data_size = sizeof(MPCContext), |
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.init = mpc8_decode_init, |
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FF_CODEC_DECODE_CB(mpc8_decode_frame), |
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.flush = mpc8_decode_flush, |
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.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF, |
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.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, |
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AV_SAMPLE_FMT_NONE }, |
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
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};
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