yading@10: /* yading@10: * Musepack SV8 decoder yading@10: * Copyright (c) 2007 Konstantin Shishkov yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: /** yading@10: * @file yading@10: * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples yading@10: * divided into 32 subbands. yading@10: */ yading@10: yading@10: #include "libavutil/channel_layout.h" yading@10: #include "libavutil/lfg.h" yading@10: #include "avcodec.h" yading@10: #include "get_bits.h" yading@10: #include "dsputil.h" yading@10: #include "internal.h" yading@10: #include "mpegaudiodsp.h" yading@10: yading@10: #include "mpc.h" yading@10: #include "mpc8data.h" yading@10: #include "mpc8huff.h" yading@10: yading@10: static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2]; yading@10: static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc; yading@10: yading@10: static const int q3_offsets[2] = { MPC8_Q3_OFFSET, MPC8_Q4_OFFSET }; yading@10: static const int quant_offsets[6] = { MPC8_Q5_OFFSET, MPC8_Q6_OFFSET, MPC8_Q7_OFFSET, MPC8_Q8_OFFSET }; yading@10: yading@10: static inline int mpc8_dec_base(GetBitContext *gb, int k, int n) yading@10: { yading@10: int len = mpc8_cnk_len[k-1][n-1] - 1; yading@10: int code = len ? get_bits_long(gb, len) : 0; yading@10: yading@10: if (code >= mpc8_cnk_lost[k-1][n-1]) yading@10: code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1]; yading@10: yading@10: return code; yading@10: } yading@10: yading@10: static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n) yading@10: { yading@10: int bits = 0; yading@10: const uint32_t * C = mpc8_cnk[k-1]; yading@10: int code = mpc8_dec_base(gb, k, n); yading@10: yading@10: do { yading@10: n--; yading@10: if (code >= C[n]) { yading@10: bits |= 1 << n; yading@10: code -= C[n]; yading@10: C -= 32; yading@10: k--; yading@10: } yading@10: } while(k > 0); yading@10: yading@10: return bits; yading@10: } yading@10: yading@10: static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m) yading@10: { yading@10: if(mpc8_cnk_len[0][m] < 1) return 0; yading@10: return mpc8_dec_base(gb, 1, m+1); yading@10: } yading@10: yading@10: static int mpc8_get_mask(GetBitContext *gb, int size, int t) yading@10: { yading@10: int mask = 0; yading@10: yading@10: if(t && t != size) yading@10: mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size); yading@10: if((t << 1) > size) mask = ~mask; yading@10: yading@10: return mask; yading@10: } yading@10: yading@10: static const uint16_t vlc_offsets[13] = { yading@10: 0, 640, 1184, 1748, 2298, 2426, 2554, 3066, 3578, 4106, 4618, 5196, 5708 yading@10: }; yading@10: yading@10: static av_cold int mpc8_decode_init(AVCodecContext * avctx) yading@10: { yading@10: int i; yading@10: MPCContext *c = avctx->priv_data; yading@10: GetBitContext gb; yading@10: static int vlc_initialized = 0; yading@10: int channels; yading@10: yading@10: static VLC_TYPE band_table[542][2]; yading@10: static VLC_TYPE q1_table[520][2]; yading@10: static VLC_TYPE q9up_table[524][2]; yading@10: static VLC_TYPE scfi0_table[1 << MPC8_SCFI0_BITS][2]; yading@10: static VLC_TYPE scfi1_table[1 << MPC8_SCFI1_BITS][2]; yading@10: static VLC_TYPE dscf0_table[560][2]; yading@10: static VLC_TYPE dscf1_table[598][2]; yading@10: static VLC_TYPE q3_0_table[512][2]; yading@10: static VLC_TYPE q3_1_table[516][2]; yading@10: static VLC_TYPE codes_table[5708][2]; yading@10: yading@10: if(avctx->extradata_size < 2){ yading@10: av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size); yading@10: return -1; yading@10: } yading@10: memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); yading@10: av_lfg_init(&c->rnd, 0xDEADBEEF); yading@10: ff_dsputil_init(&c->dsp, avctx); yading@10: ff_mpadsp_init(&c->mpadsp); yading@10: yading@10: ff_mpc_init(); yading@10: yading@10: init_get_bits(&gb, avctx->extradata, 16); yading@10: yading@10: skip_bits(&gb, 3);//sample rate yading@10: c->maxbands = get_bits(&gb, 5) + 1; yading@10: if (c->maxbands >= BANDS) { yading@10: av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: channels = get_bits(&gb, 4) + 1; yading@10: if (channels > 2) { yading@10: avpriv_request_sample(avctx, "Multichannel MPC SV8"); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: c->MSS = get_bits1(&gb); yading@10: c->frames = 1 << (get_bits(&gb, 3) * 2); yading@10: yading@10: avctx->sample_fmt = AV_SAMPLE_FMT_S16P; yading@10: avctx->channel_layout = (channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; yading@10: avctx->channels = channels; yading@10: yading@10: if(vlc_initialized) return 0; yading@10: av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); yading@10: yading@10: band_vlc.table = band_table; yading@10: band_vlc.table_allocated = 542; yading@10: init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE, yading@10: mpc8_bands_bits, 1, 1, yading@10: mpc8_bands_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); yading@10: yading@10: q1_vlc.table = q1_table; yading@10: q1_vlc.table_allocated = 520; yading@10: init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE, yading@10: mpc8_q1_bits, 1, 1, yading@10: mpc8_q1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); yading@10: q9up_vlc.table = q9up_table; yading@10: q9up_vlc.table_allocated = 524; yading@10: init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE, yading@10: mpc8_q9up_bits, 1, 1, yading@10: mpc8_q9up_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); yading@10: yading@10: scfi_vlc[0].table = scfi0_table; yading@10: scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS; yading@10: init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE, yading@10: mpc8_scfi0_bits, 1, 1, yading@10: mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); yading@10: scfi_vlc[1].table = scfi1_table; yading@10: scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS; yading@10: init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE, yading@10: mpc8_scfi1_bits, 1, 1, yading@10: mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); yading@10: yading@10: dscf_vlc[0].table = dscf0_table; yading@10: dscf_vlc[0].table_allocated = 560; yading@10: init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE, yading@10: mpc8_dscf0_bits, 1, 1, yading@10: mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); yading@10: dscf_vlc[1].table = dscf1_table; yading@10: dscf_vlc[1].table_allocated = 598; yading@10: init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE, yading@10: mpc8_dscf1_bits, 1, 1, yading@10: mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); yading@10: yading@10: q3_vlc[0].table = q3_0_table; yading@10: q3_vlc[0].table_allocated = 512; yading@10: ff_init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE, yading@10: mpc8_q3_bits, 1, 1, yading@10: mpc8_q3_codes, 1, 1, yading@10: mpc8_q3_syms, 1, 1, INIT_VLC_USE_NEW_STATIC); yading@10: q3_vlc[1].table = q3_1_table; yading@10: q3_vlc[1].table_allocated = 516; yading@10: ff_init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE, yading@10: mpc8_q4_bits, 1, 1, yading@10: mpc8_q4_codes, 1, 1, yading@10: mpc8_q4_syms, 1, 1, INIT_VLC_USE_NEW_STATIC); yading@10: yading@10: for(i = 0; i < 2; i++){ yading@10: res_vlc[i].table = &codes_table[vlc_offsets[0+i]]; yading@10: res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i]; yading@10: init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE, yading@10: &mpc8_res_bits[i], 1, 1, yading@10: &mpc8_res_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); yading@10: yading@10: q2_vlc[i].table = &codes_table[vlc_offsets[2+i]]; yading@10: q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i]; yading@10: init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE, yading@10: &mpc8_q2_bits[i], 1, 1, yading@10: &mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); yading@10: yading@10: quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]]; yading@10: quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i]; yading@10: init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE, yading@10: &mpc8_q5_bits[i], 1, 1, yading@10: &mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); yading@10: quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]]; yading@10: quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i]; yading@10: init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE, yading@10: &mpc8_q6_bits[i], 1, 1, yading@10: &mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); yading@10: quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]]; yading@10: quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i]; yading@10: init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE, yading@10: &mpc8_q7_bits[i], 1, 1, yading@10: &mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); yading@10: quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]]; yading@10: quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i]; yading@10: init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE, yading@10: &mpc8_q8_bits[i], 1, 1, yading@10: &mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); yading@10: } yading@10: vlc_initialized = 1; yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int mpc8_decode_frame(AVCodecContext * avctx, void *data, yading@10: int *got_frame_ptr, AVPacket *avpkt) yading@10: { yading@10: AVFrame *frame = data; yading@10: const uint8_t *buf = avpkt->data; yading@10: int buf_size = avpkt->size; yading@10: MPCContext *c = avctx->priv_data; yading@10: GetBitContext gb2, *gb = &gb2; yading@10: int i, j, k, ch, cnt, res, t; yading@10: Band *bands = c->bands; yading@10: int off; yading@10: int maxband, keyframe; yading@10: int last[2]; yading@10: yading@10: /* get output buffer */ yading@10: frame->nb_samples = MPC_FRAME_SIZE; yading@10: if ((res = ff_get_buffer(avctx, frame, 0)) < 0) yading@10: return res; yading@10: yading@10: keyframe = c->cur_frame == 0; yading@10: yading@10: if(keyframe){ yading@10: memset(c->Q, 0, sizeof(c->Q)); yading@10: c->last_bits_used = 0; yading@10: } yading@10: init_get_bits(gb, buf, buf_size * 8); yading@10: skip_bits(gb, c->last_bits_used & 7); yading@10: yading@10: if(keyframe) yading@10: maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1); yading@10: else{ yading@10: maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2); yading@10: if(maxband > 32) maxband -= 33; yading@10: } yading@10: yading@10: if(maxband > c->maxbands + 1) { yading@10: av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: c->last_max_band = maxband; yading@10: yading@10: /* read subband indexes */ yading@10: if(maxband){ yading@10: last[0] = last[1] = 0; yading@10: for(i = maxband - 1; i >= 0; i--){ yading@10: for(ch = 0; ch < 2; ch++){ yading@10: last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch]; yading@10: if(last[ch] > 15) last[ch] -= 17; yading@10: bands[i].res[ch] = last[ch]; yading@10: } yading@10: } yading@10: if(c->MSS){ yading@10: int mask; yading@10: yading@10: cnt = 0; yading@10: for(i = 0; i < maxband; i++) yading@10: if(bands[i].res[0] || bands[i].res[1]) yading@10: cnt++; yading@10: t = mpc8_get_mod_golomb(gb, cnt); yading@10: mask = mpc8_get_mask(gb, cnt, t); yading@10: for(i = maxband - 1; i >= 0; i--) yading@10: if(bands[i].res[0] || bands[i].res[1]){ yading@10: bands[i].msf = mask & 1; yading@10: mask >>= 1; yading@10: } yading@10: } yading@10: } yading@10: for(i = maxband; i < c->maxbands; i++) yading@10: bands[i].res[0] = bands[i].res[1] = 0; yading@10: yading@10: if(keyframe){ yading@10: for(i = 0; i < 32; i++) yading@10: c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1; yading@10: } yading@10: yading@10: for(i = 0; i < maxband; i++){ yading@10: if(bands[i].res[0] || bands[i].res[1]){ yading@10: cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1; yading@10: if(cnt >= 0){ yading@10: t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1); yading@10: if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt); yading@10: if(bands[i].res[1]) bands[i].scfi[1] = t & 3; yading@10: } yading@10: } yading@10: } yading@10: yading@10: for(i = 0; i < maxband; i++){ yading@10: for(ch = 0; ch < 2; ch++){ yading@10: if(!bands[i].res[ch]) continue; yading@10: yading@10: if(c->oldDSCF[ch][i]){ yading@10: bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6; yading@10: c->oldDSCF[ch][i] = 0; yading@10: }else{ yading@10: t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2); yading@10: if(t == 64) yading@10: t += get_bits(gb, 6); yading@10: bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6; yading@10: } yading@10: for(j = 0; j < 2; j++){ yading@10: if((bands[i].scfi[ch] << j) & 2) yading@10: bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j]; yading@10: else{ yading@10: t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2); yading@10: if(t == 31) yading@10: t = 64 + get_bits(gb, 6); yading@10: bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6; yading@10: } yading@10: } yading@10: } yading@10: } yading@10: yading@10: for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){ yading@10: for(ch = 0; ch < 2; ch++){ yading@10: res = bands[i].res[ch]; yading@10: switch(res){ yading@10: case -1: yading@10: for(j = 0; j < SAMPLES_PER_BAND; j++) yading@10: c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510; yading@10: break; yading@10: case 0: yading@10: break; yading@10: case 1: yading@10: for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){ yading@10: cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2); yading@10: t = mpc8_get_mask(gb, 18, cnt); yading@10: for(k = 0; k < SAMPLES_PER_BAND / 2; k++, t <<= 1) yading@10: c->Q[ch][off + j + k] = (t & 0x20000) ? (get_bits1(gb) << 1) - 1 : 0; yading@10: } yading@10: break; yading@10: case 2: yading@10: cnt = 6;//2*mpc8_thres[res] yading@10: for(j = 0; j < SAMPLES_PER_BAND; j += 3){ yading@10: t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2); yading@10: c->Q[ch][off + j + 0] = mpc8_idx50[t]; yading@10: c->Q[ch][off + j + 1] = mpc8_idx51[t]; yading@10: c->Q[ch][off + j + 2] = mpc8_idx52[t]; yading@10: cnt = (cnt >> 1) + mpc8_huffq2[t]; yading@10: } yading@10: break; yading@10: case 3: yading@10: case 4: yading@10: for(j = 0; j < SAMPLES_PER_BAND; j += 2){ yading@10: t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3]; yading@10: c->Q[ch][off + j + 1] = t >> 4; yading@10: c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF); yading@10: } yading@10: break; yading@10: case 5: yading@10: case 6: yading@10: case 7: yading@10: case 8: yading@10: cnt = 2 * mpc8_thres[res]; yading@10: for(j = 0; j < SAMPLES_PER_BAND; j++){ yading@10: t = get_vlc2(gb, quant_vlc[res - 5][cnt > mpc8_thres[res]].table, quant_vlc[res - 5][cnt > mpc8_thres[res]].bits, 2) + quant_offsets[res - 5]; yading@10: c->Q[ch][off + j] = t; yading@10: cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]); yading@10: } yading@10: break; yading@10: default: yading@10: for(j = 0; j < SAMPLES_PER_BAND; j++){ yading@10: c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2); yading@10: if(res != 9){ yading@10: c->Q[ch][off + j] <<= res - 9; yading@10: c->Q[ch][off + j] |= get_bits(gb, res - 9); yading@10: } yading@10: c->Q[ch][off + j] -= (1 << (res - 2)) - 1; yading@10: } yading@10: } yading@10: } yading@10: } yading@10: yading@10: ff_mpc_dequantize_and_synth(c, maxband - 1, yading@10: (int16_t **)frame->extended_data, yading@10: avctx->channels); yading@10: yading@10: c->cur_frame++; yading@10: yading@10: c->last_bits_used = get_bits_count(gb); yading@10: if(get_bits_left(gb) < 8) // we have only padding left yading@10: c->last_bits_used = buf_size << 3; yading@10: if(c->cur_frame >= c->frames) yading@10: c->cur_frame = 0; yading@10: yading@10: *got_frame_ptr = 1; yading@10: yading@10: return c->cur_frame ? c->last_bits_used >> 3 : buf_size; yading@10: } yading@10: yading@10: static av_cold void mpc8_decode_flush(AVCodecContext *avctx) yading@10: { yading@10: MPCContext *c = avctx->priv_data; yading@10: c->cur_frame = 0; yading@10: } yading@10: yading@10: AVCodec ff_mpc8_decoder = { yading@10: .name = "mpc8", yading@10: .type = AVMEDIA_TYPE_AUDIO, yading@10: .id = AV_CODEC_ID_MUSEPACK8, yading@10: .priv_data_size = sizeof(MPCContext), yading@10: .init = mpc8_decode_init, yading@10: .decode = mpc8_decode_frame, yading@10: .flush = mpc8_decode_flush, yading@10: .capabilities = CODEC_CAP_DR1, yading@10: .long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"), yading@10: .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, yading@10: AV_SAMPLE_FMT_NONE }, yading@10: };