| /* | |
| * Musepack SV8 decoder | |
| * Copyright (c) 2007 Konstantin Shishkov | |
| * | |
| * This file is part of FFmpeg. | |
| * | |
| * FFmpeg 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. | |
| * | |
| * FFmpeg 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 FFmpeg; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| /** | |
| * @file | |
| * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples | |
| * divided into 32 subbands. | |
| */ | |
| #include "libavutil/channel_layout.h" | |
| #include "libavutil/lfg.h" | |
| #include "libavutil/thread.h" | |
| #include "avcodec.h" | |
| #include "codec_internal.h" | |
| #include "decode.h" | |
| #include "get_bits.h" | |
| #include "mpegaudiodsp.h" | |
| #include "mpc.h" | |
| #include "mpc8data.h" | |
| #include "mpc8huff.h" | |
| static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2]; | |
| static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc; | |
| static inline int mpc8_dec_base(GetBitContext *gb, int k, int n) | |
| { | |
| int len = mpc8_cnk_len[k-1][n-1] - 1; | |
| int code = len ? get_bits_long(gb, len) : 0; | |
| if (code >= mpc8_cnk_lost[k-1][n-1]) | |
| code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1]; | |
| return code; | |
| } | |
| static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n) | |
| { | |
| int bits = 0; | |
| const uint32_t * C = mpc8_cnk[k-1]; | |
| int code = mpc8_dec_base(gb, k, n); | |
| do { | |
| n--; | |
| if (code >= C[n]) { | |
| bits |= 1U << n; | |
| code -= C[n]; | |
| C -= 32; | |
| k--; | |
| } | |
| } while(k > 0); | |
| return bits; | |
| } | |
| static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m) | |
| { | |
| if(mpc8_cnk_len[0][m] < 1) return 0; | |
| return mpc8_dec_base(gb, 1, m+1); | |
| } | |
| static int mpc8_get_mask(GetBitContext *gb, int size, int t) | |
| { | |
| int mask = 0; | |
| if(t && t != size) | |
| mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size); | |
| if((t << 1) > size) mask = ~mask; | |
| return mask; | |
| } | |
| static av_cold void build_vlc(VLC *vlc, unsigned *buf_offset, | |
| const uint8_t codes_counts[16], | |
| const uint8_t **syms, int offset) | |
| { | |
| static VLCElem vlc_buf[9296]; | |
| uint8_t len[MPC8_MAX_VLC_SIZE]; | |
| unsigned num = 0; | |
| vlc->table = &vlc_buf[*buf_offset]; | |
| vlc->table_allocated = FF_ARRAY_ELEMS(vlc_buf) - *buf_offset; | |
| for (int i = 16; i > 0; i--) | |
| for (unsigned tmp = num + codes_counts[i - 1]; num < tmp; num++) | |
| len[num] = i; | |
| ff_vlc_init_from_lengths(vlc, FFMIN(len[0], 9), num, len, 1, | |
| *syms, 1, 1, offset, VLC_INIT_STATIC_OVERLONG, NULL); | |
| *buf_offset += vlc->table_size; | |
| *syms += num; | |
| } | |
| static av_cold void mpc8_init_static(void) | |
| { | |
| const uint8_t *q_syms = mpc8_q_syms, *bands_syms = mpc8_bands_syms; | |
| const uint8_t *res_syms = mpc8_res_syms, *scfi_syms = mpc8_scfi_syms; | |
| const uint8_t *dscf_syms = mpc8_dscf_syms; | |
| unsigned offset = 0; | |
| build_vlc(&band_vlc, &offset, mpc8_bands_len_counts, &bands_syms, 0); | |
| build_vlc(&q1_vlc, &offset, mpc8_q1_len_counts, &q_syms, 0); | |
| build_vlc(&q9up_vlc, &offset, mpc8_q9up_len_counts, &q_syms, 0); | |
| for (int i = 0; i < 2; i++){ | |
| build_vlc(&scfi_vlc[i], &offset, mpc8_scfi_len_counts[i], &scfi_syms, 0); | |
| build_vlc(&dscf_vlc[i], &offset, mpc8_dscf_len_counts[i], &dscf_syms, 0); | |
| build_vlc(&res_vlc[i], &offset, mpc8_res_len_counts[i], &res_syms, 0); | |
| build_vlc(&q2_vlc[i], &offset, mpc8_q2_len_counts[i], &q_syms, 0); | |
| build_vlc(&q3_vlc[i], &offset, mpc8_q34_len_counts[i], | |
| &q_syms, -48 - 16 * i); | |
| for (int j = 0; j < 4; j++) | |
| build_vlc(&quant_vlc[j][i], &offset, mpc8_q5_8_len_counts[i][j], | |
| &q_syms, -((8 << j) - 1)); | |
| } | |
| ff_mpa_synth_init_fixed(); | |
| } | |
| static av_cold int mpc8_decode_init(AVCodecContext * avctx) | |
| { | |
| static AVOnce init_static_once = AV_ONCE_INIT; | |
| MPCContext *c = avctx->priv_data; | |
| GetBitContext gb; | |
| int channels; | |
| if(avctx->extradata_size < 2){ | |
| av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size); | |
| return -1; | |
| } | |
| memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); | |
| av_lfg_init(&c->rnd, 0xDEADBEEF); | |
| ff_mpadsp_init(&c->mpadsp); | |
| init_get_bits(&gb, avctx->extradata, 16); | |
| skip_bits(&gb, 3);//sample rate | |
| c->maxbands = get_bits(&gb, 5) + 1; | |
| if (c->maxbands >= BANDS) { | |
| av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| channels = get_bits(&gb, 4) + 1; | |
| if (channels > 2) { | |
| avpriv_request_sample(avctx, "Multichannel MPC SV8"); | |
| return AVERROR_PATCHWELCOME; | |
| } | |
| c->MSS = get_bits1(&gb); | |
| c->frames = 1 << (get_bits(&gb, 3) * 2); | |
| avctx->sample_fmt = AV_SAMPLE_FMT_S16P; | |
| av_channel_layout_uninit(&avctx->ch_layout); | |
| av_channel_layout_default(&avctx->ch_layout, channels); | |
| ff_thread_once(&init_static_once, mpc8_init_static); | |
| return 0; | |
| } | |
| static int mpc8_decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| int *got_frame_ptr, AVPacket *avpkt) | |
| { | |
| const uint8_t *buf = avpkt->data; | |
| int buf_size = avpkt->size; | |
| MPCContext *c = avctx->priv_data; | |
| GetBitContext gb2, *gb = &gb2; | |
| int i, j, k, ch, cnt, res, t; | |
| Band *bands = c->bands; | |
| int off; | |
| int maxband, keyframe; | |
| int last[2]; | |
| keyframe = c->cur_frame == 0; | |
| if(keyframe){ | |
| memset(c->Q, 0, sizeof(c->Q)); | |
| c->last_bits_used = 0; | |
| } | |
| if ((res = init_get_bits8(gb, buf, buf_size)) < 0) | |
| return res; | |
| skip_bits(gb, c->last_bits_used & 7); | |
| if(keyframe) | |
| maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1); | |
| else{ | |
| maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2); | |
| if(maxband > 32) maxband -= 33; | |
| } | |
| if (get_bits_left(gb) < 0) { | |
| *got_frame_ptr = 0; | |
| return buf_size; | |
| } | |
| if(maxband > c->maxbands + 1) { | |
| av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| c->last_max_band = maxband; | |
| /* read subband indexes */ | |
| if(maxband){ | |
| last[0] = last[1] = 0; | |
| for(i = maxband - 1; i >= 0; i--){ | |
| for(ch = 0; ch < 2; ch++){ | |
| last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch]; | |
| if(last[ch] > 15) last[ch] -= 17; | |
| bands[i].res[ch] = last[ch]; | |
| } | |
| } | |
| if(c->MSS){ | |
| int mask; | |
| cnt = 0; | |
| for(i = 0; i < maxband; i++) | |
| if(bands[i].res[0] || bands[i].res[1]) | |
| cnt++; | |
| t = mpc8_get_mod_golomb(gb, cnt); | |
| mask = mpc8_get_mask(gb, cnt, t); | |
| for(i = maxband - 1; i >= 0; i--) | |
| if(bands[i].res[0] || bands[i].res[1]){ | |
| bands[i].msf = mask & 1; | |
| mask >>= 1; | |
| } | |
| } | |
| } | |
| for(i = maxband; i < c->maxbands; i++) | |
| bands[i].res[0] = bands[i].res[1] = 0; | |
| if(keyframe){ | |
| for(i = 0; i < 32; i++) | |
| c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1; | |
| } | |
| for(i = 0; i < maxband; i++){ | |
| if(bands[i].res[0] || bands[i].res[1]){ | |
| cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1; | |
| if(cnt >= 0){ | |
| t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1); | |
| if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt); | |
| if(bands[i].res[1]) bands[i].scfi[1] = t & 3; | |
| } | |
| } | |
| } | |
| for(i = 0; i < maxband; i++){ | |
| for(ch = 0; ch < 2; ch++){ | |
| if(!bands[i].res[ch]) continue; | |
| if(c->oldDSCF[ch][i]){ | |
| bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6; | |
| c->oldDSCF[ch][i] = 0; | |
| }else{ | |
| t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2); | |
| if(t == 64) | |
| t += get_bits(gb, 6); | |
| bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6; | |
| } | |
| for(j = 0; j < 2; j++){ | |
| if((bands[i].scfi[ch] << j) & 2) | |
| bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j]; | |
| else{ | |
| t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2); | |
| if(t == 31) | |
| t = 64 + get_bits(gb, 6); | |
| bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6; | |
| } | |
| } | |
| } | |
| } | |
| for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){ | |
| for(ch = 0; ch < 2; ch++){ | |
| res = bands[i].res[ch]; | |
| switch(res){ | |
| case -1: | |
| for(j = 0; j < SAMPLES_PER_BAND; j++) | |
| c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510; | |
| break; | |
| case 0: | |
| break; | |
| case 1: | |
| for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){ | |
| cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2); | |
| t = mpc8_get_mask(gb, 18, cnt); | |
| for(k = 0; k < SAMPLES_PER_BAND / 2; k++) | |
| c->Q[ch][off + j + k] = t & (1 << (SAMPLES_PER_BAND / 2 - k - 1)) | |
| ? (get_bits1(gb) << 1) - 1 : 0; | |
| } | |
| break; | |
| case 2: | |
| cnt = 6;//2*mpc8_thres[res] | |
| for(j = 0; j < SAMPLES_PER_BAND; j += 3){ | |
| t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2); | |
| c->Q[ch][off + j + 0] = mpc8_idx50[t]; | |
| c->Q[ch][off + j + 1] = mpc8_idx51[t]; | |
| c->Q[ch][off + j + 2] = mpc8_idx52[t]; | |
| cnt = (cnt >> 1) + mpc8_huffq2[t]; | |
| } | |
| break; | |
| case 3: | |
| case 4: | |
| for(j = 0; j < SAMPLES_PER_BAND; j += 2){ | |
| t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2); | |
| c->Q[ch][off + j + 1] = t >> 4; | |
| c->Q[ch][off + j + 0] = sign_extend(t, 4); | |
| } | |
| break; | |
| case 5: | |
| case 6: | |
| case 7: | |
| case 8: | |
| cnt = 2 * mpc8_thres[res]; | |
| for(j = 0; j < SAMPLES_PER_BAND; j++){ | |
| const VLC *vlc = &quant_vlc[res - 5][cnt > mpc8_thres[res]]; | |
| c->Q[ch][off + j] = get_vlc2(gb, vlc->table, vlc->bits, 2); | |
| cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]); | |
| } | |
| break; | |
| default: | |
| for(j = 0; j < SAMPLES_PER_BAND; j++){ | |
| c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2); | |
| if(res != 9){ | |
| c->Q[ch][off + j] <<= res - 9; | |
| c->Q[ch][off + j] |= get_bits(gb, res - 9); | |
| } | |
| c->Q[ch][off + j] -= (1 << (res - 2)) - 1; | |
| } | |
| } | |
| } | |
| } | |
| frame->nb_samples = MPC_FRAME_SIZE; | |
| if ((res = ff_get_buffer(avctx, frame, 0)) < 0) | |
| return res; | |
| ff_mpc_dequantize_and_synth(c, maxband - 1, | |
| (int16_t **)frame->extended_data, | |
| avctx->ch_layout.nb_channels); | |
| c->cur_frame++; | |
| c->last_bits_used = get_bits_count(gb); | |
| if(c->cur_frame >= c->frames) | |
| c->cur_frame = 0; | |
| if (get_bits_left(gb) < 0) { | |
| av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb)); | |
| c->last_bits_used = buf_size << 3; | |
| } else if (c->cur_frame == 0 && get_bits_left(gb) < 8) {// we have only padding left | |
| c->last_bits_used = buf_size << 3; | |
| } | |
| *got_frame_ptr = 1; | |
| return c->cur_frame ? c->last_bits_used >> 3 : buf_size; | |
| } | |
| static av_cold void mpc8_decode_flush(AVCodecContext *avctx) | |
| { | |
| MPCContext *c = avctx->priv_data; | |
| c->cur_frame = 0; | |
| } | |
| const FFCodec ff_mpc8_decoder = { | |
| .p.name = "mpc8", | |
| CODEC_LONG_NAME("Musepack SV8"), | |
| .p.type = AVMEDIA_TYPE_AUDIO, | |
| .p.id = AV_CODEC_ID_MUSEPACK8, | |
| .priv_data_size = sizeof(MPCContext), | |
| .init = mpc8_decode_init, | |
| FF_CODEC_DECODE_CB(mpc8_decode_frame), | |
| .flush = mpc8_decode_flush, | |
| .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF, | |
| .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, | |
| AV_SAMPLE_FMT_NONE }, | |
| }; |