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277 lines
9.4 KiB
277 lines
9.4 KiB
/* |
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* Musepack SV7 decoder |
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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 libavcodec/mpc7.c Musepack SV7 decoder |
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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/lfg.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 "mpc7data.h" |
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#define BANDS 32 |
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#define SAMPLES_PER_BAND 36 |
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#define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND) |
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static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2]; |
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static av_cold int mpc7_decode_init(AVCodecContext * avctx) |
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{ |
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int i, j; |
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MPCContext *c = avctx->priv_data; |
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GetBitContext gb; |
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uint8_t buf[16]; |
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static int vlc_initialized = 0; |
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if(avctx->extradata_size < 16){ |
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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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dsputil_init(&c->dsp, avctx); |
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c->dsp.bswap_buf((uint32_t*)buf, (const uint32_t*)avctx->extradata, 4); |
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ff_mpc_init(); |
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init_get_bits(&gb, buf, 128); |
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c->IS = get_bits1(&gb); |
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c->MSS = get_bits1(&gb); |
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c->maxbands = get_bits(&gb, 6); |
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if(c->maxbands >= BANDS){ |
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av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands); |
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return -1; |
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} |
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skip_bits(&gb, 88); |
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c->gapless = get_bits1(&gb); |
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c->lastframelen = get_bits(&gb, 11); |
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av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n", |
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c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands); |
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c->frames_to_skip = 0; |
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if(vlc_initialized) return 0; |
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av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); |
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if(init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE, |
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&mpc7_scfi[1], 2, 1, |
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&mpc7_scfi[0], 2, 1, INIT_VLC_USE_STATIC)){ |
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av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n"); |
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return -1; |
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} |
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if(init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE, |
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&mpc7_dscf[1], 2, 1, |
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&mpc7_dscf[0], 2, 1, INIT_VLC_USE_STATIC)){ |
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av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n"); |
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return -1; |
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} |
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if(init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE, |
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&mpc7_hdr[1], 2, 1, |
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&mpc7_hdr[0], 2, 1, INIT_VLC_USE_STATIC)){ |
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av_log(avctx, AV_LOG_ERROR, "Cannot init HDR VLC\n"); |
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return -1; |
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} |
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for(i = 0; i < MPC7_QUANT_VLC_TABLES; i++){ |
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for(j = 0; j < 2; j++){ |
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if(init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i], |
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&mpc7_quant_vlc[i][j][1], 4, 2, |
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&mpc7_quant_vlc[i][j][0], 4, 2, INIT_VLC_USE_STATIC)){ |
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av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j); |
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return -1; |
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} |
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} |
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} |
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vlc_initialized = 1; |
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avctx->sample_fmt = SAMPLE_FMT_S16; |
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avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO; |
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return 0; |
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} |
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/** |
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* Fill samples for given subband |
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*/ |
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static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst) |
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{ |
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int i, i1, t; |
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switch(idx){ |
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case -1: |
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for(i = 0; i < SAMPLES_PER_BAND; i++){ |
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*dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510; |
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} |
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break; |
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case 1: |
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i1 = get_bits1(gb); |
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for(i = 0; i < SAMPLES_PER_BAND/3; i++){ |
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t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2); |
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*dst++ = mpc7_idx30[t]; |
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*dst++ = mpc7_idx31[t]; |
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*dst++ = mpc7_idx32[t]; |
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} |
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break; |
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case 2: |
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i1 = get_bits1(gb); |
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for(i = 0; i < SAMPLES_PER_BAND/2; i++){ |
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t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2); |
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*dst++ = mpc7_idx50[t]; |
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*dst++ = mpc7_idx51[t]; |
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} |
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break; |
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case 3: case 4: case 5: case 6: case 7: |
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i1 = get_bits1(gb); |
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for(i = 0; i < SAMPLES_PER_BAND; i++) |
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*dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx-1]; |
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break; |
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case 8: case 9: case 10: case 11: case 12: |
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case 13: case 14: case 15: case 16: case 17: |
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t = (1 << (idx - 2)) - 1; |
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for(i = 0; i < SAMPLES_PER_BAND; i++) |
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*dst++ = get_bits(gb, idx - 1) - t; |
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break; |
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default: // case 0 and -2..-17 |
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return; |
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} |
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} |
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static int mpc7_decode_frame(AVCodecContext * avctx, |
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void *data, int *data_size, |
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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 gb; |
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uint8_t *bits; |
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int i, ch, t; |
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int mb = -1; |
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Band *bands = c->bands; |
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int off; |
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int bits_used, bits_avail; |
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memset(bands, 0, sizeof(bands)); |
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if(buf_size <= 4){ |
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av_log(avctx, AV_LOG_ERROR, "Too small buffer passed (%i bytes)\n", buf_size); |
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} |
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bits = av_malloc(((buf_size - 1) & ~3) + FF_INPUT_BUFFER_PADDING_SIZE); |
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c->dsp.bswap_buf((uint32_t*)bits, (const uint32_t*)(buf + 4), (buf_size - 4) >> 2); |
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init_get_bits(&gb, bits, (buf_size - 4)* 8); |
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skip_bits(&gb, buf[0]); |
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/* read subband indexes */ |
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for(i = 0; i <= c->maxbands; i++){ |
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for(ch = 0; ch < 2; ch++){ |
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if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5; |
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if(!i || (t == 4)) bands[i].res[ch] = get_bits(&gb, 4); |
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else bands[i].res[ch] = bands[i-1].res[ch] + t; |
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} |
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if(bands[i].res[0] || bands[i].res[1]){ |
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mb = i; |
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if(c->MSS) bands[i].msf = get_bits1(&gb); |
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} |
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} |
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/* get scale indexes coding method */ |
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for(i = 0; i <= mb; i++) |
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for(ch = 0; ch < 2; ch++) |
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if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1); |
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/* get scale indexes */ |
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for(i = 0; i <= mb; i++){ |
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for(ch = 0; ch < 2; ch++){ |
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if(bands[i].res[ch]){ |
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bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i]; |
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t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; |
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bands[i].scf_idx[ch][0] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][2] + t); |
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switch(bands[i].scfi[ch]){ |
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case 0: |
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t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; |
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bands[i].scf_idx[ch][1] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][0] + t); |
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t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; |
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bands[i].scf_idx[ch][2] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][1] + t); |
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break; |
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case 1: |
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t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; |
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bands[i].scf_idx[ch][1] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][0] + t); |
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bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1]; |
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break; |
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case 2: |
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bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0]; |
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t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; |
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bands[i].scf_idx[ch][2] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][1] + t); |
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break; |
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case 3: |
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bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0]; |
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break; |
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} |
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c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2]; |
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} |
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} |
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} |
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/* get quantizers */ |
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memset(c->Q, 0, sizeof(c->Q)); |
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off = 0; |
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for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND) |
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for(ch = 0; ch < 2; ch++) |
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idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off); |
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ff_mpc_dequantize_and_synth(c, mb, data); |
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av_free(bits); |
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bits_used = get_bits_count(&gb); |
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bits_avail = (buf_size - 4) * 8; |
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if(!buf[1] && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))){ |
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av_log(NULL,0, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail); |
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return -1; |
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} |
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if(c->frames_to_skip){ |
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c->frames_to_skip--; |
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*data_size = 0; |
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return buf_size; |
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} |
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*data_size = (buf[1] ? c->lastframelen : MPC_FRAME_SIZE) * 4; |
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return buf_size; |
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} |
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static void mpc7_decode_flush(AVCodecContext *avctx) |
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{ |
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MPCContext *c = avctx->priv_data; |
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memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); |
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c->frames_to_skip = 32; |
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} |
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AVCodec mpc7_decoder = { |
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"mpc7", |
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CODEC_TYPE_AUDIO, |
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CODEC_ID_MUSEPACK7, |
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sizeof(MPCContext), |
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mpc7_decode_init, |
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NULL, |
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NULL, |
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mpc7_decode_frame, |
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.flush = mpc7_decode_flush, |
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.long_name = NULL_IF_CONFIG_SMALL("Musepack SV7"), |
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};
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