diff options
author | Kostya Shishkov <kostya.shishkov@gmail.com> | 2007-11-02 09:40:42 +0300 |
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committer | Kostya Shishkov <kostya.shishkov@gmail.com> | 2007-11-02 09:40:42 +0300 |
commit | 24e649afe3e47ce33729a5ccd83a7993c70f50bb (patch) | |
tree | ba4f50778a2fa46a654d98e901306916140b35af /libavcodec/mpc7.c | |
parent | 76c443c6d4c6b414eea6b0826ff6a0361795234d (diff) |
Split Musepack decoder into SV7 decoder and synth core
(for upcoming SV8 decoder)
Originally committed as revision 10905 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/mpc7.c')
-rw-r--r-- | libavcodec/mpc7.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/libavcodec/mpc7.c b/libavcodec/mpc7.c new file mode 100644 index 0000000000..1632dfc2af --- /dev/null +++ b/libavcodec/mpc7.c @@ -0,0 +1,276 @@ +/* + * Musepack SV7 decoder + * Copyright (c) 2006 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 mpc7.c Musepack SV7 decoder + * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples + * divided into 32 subbands. + */ + +#include "avcodec.h" +#include "bitstream.h" +#include "dsputil.h" +#include "random.h" + +#ifdef CONFIG_MPEGAUDIO_HP +#define USE_HIGHPRECISION +#endif +#include "mpegaudio.h" + +#include "mpc.h" +#include "mpc7data.h" + +#define BANDS 32 +#define SAMPLES_PER_BAND 36 +#define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND) + +static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2]; + +static int mpc7_decode_init(AVCodecContext * avctx) +{ + int i, j; + MPCContext *c = avctx->priv_data; + GetBitContext gb; + uint8_t buf[16]; + static int vlc_inited = 0; + + if(avctx->extradata_size < 16){ + 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_init_random(0xDEADBEEF, &c->rnd); + dsputil_init(&c->dsp, avctx); + c->dsp.bswap_buf(buf, avctx->extradata, 4); + ff_mpc_init(); + init_get_bits(&gb, buf, 128); + + c->IS = get_bits1(&gb); + c->MSS = get_bits1(&gb); + c->maxbands = get_bits(&gb, 6); + if(c->maxbands >= BANDS){ + av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands); + return -1; + } + skip_bits(&gb, 88); + c->gapless = get_bits1(&gb); + c->lastframelen = get_bits(&gb, 11); + av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n", + c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands); + c->frames_to_skip = 0; + + if(vlc_inited) return 0; + av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); + if(init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE, + &mpc7_scfi[1], 2, 1, + &mpc7_scfi[0], 2, 1, INIT_VLC_USE_STATIC)){ + av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n"); + return -1; + } + if(init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE, + &mpc7_dscf[1], 2, 1, + &mpc7_dscf[0], 2, 1, INIT_VLC_USE_STATIC)){ + av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n"); + return -1; + } + if(init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE, + &mpc7_hdr[1], 2, 1, + &mpc7_hdr[0], 2, 1, INIT_VLC_USE_STATIC)){ + av_log(avctx, AV_LOG_ERROR, "Cannot init HDR VLC\n"); + return -1; + } + for(i = 0; i < MPC7_QUANT_VLC_TABLES; i++){ + for(j = 0; j < 2; j++){ + if(init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i], + &mpc7_quant_vlc[i][j][1], 4, 2, + &mpc7_quant_vlc[i][j][0], 4, 2, INIT_VLC_USE_STATIC)){ + av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j); + return -1; + } + } + } + vlc_inited = 1; + return 0; +} + +/** + * Fill samples for given subband + */ +static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst) +{ + int i, i1, t; + switch(idx){ + case -1: + for(i = 0; i < SAMPLES_PER_BAND; i++){ + *dst++ = (av_random(&c->rnd) & 0x3FC) - 510; + } + break; + case 1: + i1 = get_bits1(gb); + for(i = 0; i < SAMPLES_PER_BAND/3; i++){ + t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2); + *dst++ = mpc7_idx30[t]; + *dst++ = mpc7_idx31[t]; + *dst++ = mpc7_idx32[t]; + } + break; + case 2: + i1 = get_bits1(gb); + for(i = 0; i < SAMPLES_PER_BAND/2; i++){ + t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2); + *dst++ = mpc7_idx50[t]; + *dst++ = mpc7_idx51[t]; + } + break; + case 3: case 4: case 5: case 6: case 7: + i1 = get_bits1(gb); + for(i = 0; i < SAMPLES_PER_BAND; i++) + *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx-1]; + break; + case 8: case 9: case 10: case 11: case 12: + case 13: case 14: case 15: case 16: case 17: + t = (1 << (idx - 2)) - 1; + for(i = 0; i < SAMPLES_PER_BAND; i++) + *dst++ = get_bits(gb, idx - 1) - t; + break; + default: // case 0 and -2..-17 + return; + } +} + +static int mpc7_decode_frame(AVCodecContext * avctx, + void *data, int *data_size, + uint8_t * buf, int buf_size) +{ + MPCContext *c = avctx->priv_data; + GetBitContext gb; + uint8_t *bits; + int i, ch, t; + int mb = -1; + Band *bands = c->bands; + int off; + int bits_used, bits_avail; + + memset(bands, 0, sizeof(bands)); + if(buf_size <= 4){ + av_log(avctx, AV_LOG_ERROR, "Too small buffer passed (%i bytes)\n", buf_size); + } + + bits = av_malloc(((buf_size - 1) & ~3) + FF_INPUT_BUFFER_PADDING_SIZE); + c->dsp.bswap_buf(bits, buf + 4, (buf_size - 4) >> 2); + init_get_bits(&gb, bits, (buf_size - 4)* 8); + skip_bits(&gb, buf[0]); + + /* read subband indexes */ + for(i = 0; i <= c->maxbands; i++){ + for(ch = 0; ch < 2; ch++){ + if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5; + if(!i || (t == 4)) bands[i].res[ch] = get_bits(&gb, 4); + else bands[i].res[ch] = bands[i-1].res[ch] + t; + } + + if(bands[i].res[0] || bands[i].res[1]){ + mb = i; + if(c->MSS) bands[i].msf = get_bits1(&gb); + } + } + /* get scale indexes coding method */ + for(i = 0; i <= mb; i++) + for(ch = 0; ch < 2; ch++) + if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1); + /* get scale indexes */ + for(i = 0; i <= mb; i++){ + for(ch = 0; ch < 2; ch++){ + if(bands[i].res[ch]){ + bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i]; + t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; + bands[i].scf_idx[ch][0] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][2] + t); + switch(bands[i].scfi[ch]){ + case 0: + t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; + bands[i].scf_idx[ch][1] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][0] + t); + t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; + bands[i].scf_idx[ch][2] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][1] + t); + break; + case 1: + t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; + bands[i].scf_idx[ch][1] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][0] + t); + bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1]; + break; + case 2: + bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0]; + t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; + bands[i].scf_idx[ch][2] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][1] + t); + break; + case 3: + bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0]; + break; + } + c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2]; + } + } + } + /* get quantizers */ + memset(c->Q, 0, sizeof(c->Q)); + off = 0; + for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND) + for(ch = 0; ch < 2; ch++) + idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off); + + ff_mpc_dequantize_and_synth(c, mb, data); + + av_free(bits); + + bits_used = get_bits_count(&gb); + bits_avail = (buf_size - 4) * 8; + if(!buf[1] && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))){ + av_log(NULL,0, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail); + return -1; + } + if(c->frames_to_skip){ + c->frames_to_skip--; + *data_size = 0; + return buf_size; + } + *data_size = (buf[1] ? c->lastframelen : MPC_FRAME_SIZE) * 4; + + return buf_size; +} + +static void mpc7_decode_flush(AVCodecContext *avctx) +{ + MPCContext *c = avctx->priv_data; + + memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); + c->frames_to_skip = 32; +} + +AVCodec mpc7_decoder = { + "mpc sv7", + CODEC_TYPE_AUDIO, + CODEC_ID_MUSEPACK7, + sizeof(MPCContext), + mpc7_decode_init, + NULL, + NULL, + mpc7_decode_frame, + .flush = mpc7_decode_flush, +}; |