| /* |
| * ATRAC3+ compatible decoder |
| * |
| * Copyright (c) 2010-2013 Maxim Poliakovski |
| * |
| * 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 |
| * Bitstream parser for ATRAC3+ decoder. |
| */ |
| |
| #include "libavutil/avassert.h" |
| #include "avcodec.h" |
| #include "get_bits.h" |
| #include "atrac3plus.h" |
| #include "atrac3plus_data.h" |
| |
| static VLC_TYPE tables_data[154276][2]; |
| static VLC wl_vlc_tabs[4]; |
| static VLC sf_vlc_tabs[8]; |
| static VLC ct_vlc_tabs[4]; |
| static VLC spec_vlc_tabs[112]; |
| static VLC gain_vlc_tabs[11]; |
| static VLC tone_vlc_tabs[7]; |
| |
| /** |
| * Generate canonical VLC table from given descriptor. |
| * |
| * @param[in] cb ptr to codebook descriptor |
| * @param[in] xlat ptr to translation table or NULL |
| * @param[in,out] tab_offset starting offset to the generated vlc table |
| * @param[out] out_vlc ptr to vlc table to be generated |
| */ |
| static av_cold void build_canonical_huff(const uint8_t *cb, const uint8_t *xlat, |
| int *tab_offset, VLC *out_vlc) |
| { |
| int i, b; |
| uint16_t codes[256]; |
| uint8_t bits[256]; |
| unsigned code = 0; |
| int index = 0; |
| int min_len = *cb++; // get shortest codeword length |
| int max_len = *cb++; // get longest codeword length |
| |
| for (b = min_len; b <= max_len; b++) { |
| for (i = *cb++; i > 0; i--) { |
| av_assert0(index < 256); |
| bits[index] = b; |
| codes[index] = code++; |
| index++; |
| } |
| code <<= 1; |
| } |
| |
| out_vlc->table = &tables_data[*tab_offset]; |
| out_vlc->table_allocated = 1 << max_len; |
| |
| ff_init_vlc_sparse(out_vlc, max_len, index, bits, 1, 1, codes, 2, 2, |
| xlat, 1, 1, INIT_VLC_USE_NEW_STATIC); |
| |
| *tab_offset += 1 << max_len; |
| } |
| |
| av_cold void ff_atrac3p_init_vlcs(void) |
| { |
| int i, wl_vlc_offs, ct_vlc_offs, sf_vlc_offs, tab_offset; |
| |
| static const int wl_nb_bits[4] = { 2, 3, 5, 5 }; |
| static const int wl_nb_codes[4] = { 3, 5, 8, 8 }; |
| static const uint8_t * const wl_bits[4] = { |
| atrac3p_wl_huff_bits1, atrac3p_wl_huff_bits2, |
| atrac3p_wl_huff_bits3, atrac3p_wl_huff_bits4 |
| }; |
| static const uint8_t * const wl_codes[4] = { |
| atrac3p_wl_huff_code1, atrac3p_wl_huff_code2, |
| atrac3p_wl_huff_code3, atrac3p_wl_huff_code4 |
| }; |
| static const uint8_t * const wl_xlats[4] = { |
| atrac3p_wl_huff_xlat1, atrac3p_wl_huff_xlat2, NULL, NULL |
| }; |
| |
| static const int ct_nb_bits[4] = { 3, 4, 4, 4 }; |
| static const int ct_nb_codes[4] = { 4, 8, 8, 8 }; |
| static const uint8_t * const ct_bits[4] = { |
| atrac3p_ct_huff_bits1, atrac3p_ct_huff_bits2, |
| atrac3p_ct_huff_bits2, atrac3p_ct_huff_bits3 |
| }; |
| static const uint8_t * const ct_codes[4] = { |
| atrac3p_ct_huff_code1, atrac3p_ct_huff_code2, |
| atrac3p_ct_huff_code2, atrac3p_ct_huff_code3 |
| }; |
| static const uint8_t * const ct_xlats[4] = { |
| NULL, NULL, atrac3p_ct_huff_xlat1, NULL |
| }; |
| |
| static const int sf_nb_bits[8] = { 9, 9, 9, 9, 6, 6, 7, 7 }; |
| static const int sf_nb_codes[8] = { 64, 64, 64, 64, 16, 16, 16, 16 }; |
| static const uint8_t * const sf_bits[8] = { |
| atrac3p_sf_huff_bits1, atrac3p_sf_huff_bits1, atrac3p_sf_huff_bits2, |
| atrac3p_sf_huff_bits3, atrac3p_sf_huff_bits4, atrac3p_sf_huff_bits4, |
| atrac3p_sf_huff_bits5, atrac3p_sf_huff_bits6 |
| }; |
| static const uint16_t * const sf_codes[8] = { |
| atrac3p_sf_huff_code1, atrac3p_sf_huff_code1, atrac3p_sf_huff_code2, |
| atrac3p_sf_huff_code3, atrac3p_sf_huff_code4, atrac3p_sf_huff_code4, |
| atrac3p_sf_huff_code5, atrac3p_sf_huff_code6 |
| }; |
| static const uint8_t * const sf_xlats[8] = { |
| atrac3p_sf_huff_xlat1, atrac3p_sf_huff_xlat2, NULL, NULL, |
| atrac3p_sf_huff_xlat4, atrac3p_sf_huff_xlat5, NULL, NULL |
| }; |
| |
| static const uint8_t * const gain_cbs[11] = { |
| atrac3p_huff_gain_npoints1_cb, atrac3p_huff_gain_npoints1_cb, |
| atrac3p_huff_gain_lev1_cb, atrac3p_huff_gain_lev2_cb, |
| atrac3p_huff_gain_lev3_cb, atrac3p_huff_gain_lev4_cb, |
| atrac3p_huff_gain_loc3_cb, atrac3p_huff_gain_loc1_cb, |
| atrac3p_huff_gain_loc4_cb, atrac3p_huff_gain_loc2_cb, |
| atrac3p_huff_gain_loc5_cb |
| }; |
| static const uint8_t * const gain_xlats[11] = { |
| NULL, atrac3p_huff_gain_npoints2_xlat, atrac3p_huff_gain_lev1_xlat, |
| atrac3p_huff_gain_lev2_xlat, atrac3p_huff_gain_lev3_xlat, |
| atrac3p_huff_gain_lev4_xlat, atrac3p_huff_gain_loc3_xlat, |
| atrac3p_huff_gain_loc1_xlat, atrac3p_huff_gain_loc4_xlat, |
| atrac3p_huff_gain_loc2_xlat, atrac3p_huff_gain_loc5_xlat |
| }; |
| |
| static const uint8_t * const tone_cbs[7] = { |
| atrac3p_huff_tonebands_cb, atrac3p_huff_numwavs1_cb, |
| atrac3p_huff_numwavs2_cb, atrac3p_huff_wav_ampsf1_cb, |
| atrac3p_huff_wav_ampsf2_cb, atrac3p_huff_wav_ampsf3_cb, |
| atrac3p_huff_freq_cb |
| }; |
| static const uint8_t * const tone_xlats[7] = { |
| NULL, NULL, atrac3p_huff_numwavs2_xlat, atrac3p_huff_wav_ampsf1_xlat, |
| atrac3p_huff_wav_ampsf2_xlat, atrac3p_huff_wav_ampsf3_xlat, |
| atrac3p_huff_freq_xlat |
| }; |
| |
| for (i = 0, wl_vlc_offs = 0, ct_vlc_offs = 2508; i < 4; i++) { |
| wl_vlc_tabs[i].table = &tables_data[wl_vlc_offs]; |
| wl_vlc_tabs[i].table_allocated = 1 << wl_nb_bits[i]; |
| ct_vlc_tabs[i].table = &tables_data[ct_vlc_offs]; |
| ct_vlc_tabs[i].table_allocated = 1 << ct_nb_bits[i]; |
| |
| ff_init_vlc_sparse(&wl_vlc_tabs[i], wl_nb_bits[i], wl_nb_codes[i], |
| wl_bits[i], 1, 1, |
| wl_codes[i], 1, 1, |
| wl_xlats[i], 1, 1, |
| INIT_VLC_USE_NEW_STATIC); |
| |
| ff_init_vlc_sparse(&ct_vlc_tabs[i], ct_nb_bits[i], ct_nb_codes[i], |
| ct_bits[i], 1, 1, |
| ct_codes[i], 1, 1, |
| ct_xlats[i], 1, 1, |
| INIT_VLC_USE_NEW_STATIC); |
| |
| wl_vlc_offs += wl_vlc_tabs[i].table_allocated; |
| ct_vlc_offs += ct_vlc_tabs[i].table_allocated; |
| } |
| |
| for (i = 0, sf_vlc_offs = 76; i < 8; i++) { |
| sf_vlc_tabs[i].table = &tables_data[sf_vlc_offs]; |
| sf_vlc_tabs[i].table_allocated = 1 << sf_nb_bits[i]; |
| |
| ff_init_vlc_sparse(&sf_vlc_tabs[i], sf_nb_bits[i], sf_nb_codes[i], |
| sf_bits[i], 1, 1, |
| sf_codes[i], 2, 2, |
| sf_xlats[i], 1, 1, |
| INIT_VLC_USE_NEW_STATIC); |
| sf_vlc_offs += sf_vlc_tabs[i].table_allocated; |
| } |
| |
| tab_offset = 2564; |
| |
| /* build huffman tables for spectrum decoding */ |
| for (i = 0; i < 112; i++) { |
| if (atrac3p_spectra_tabs[i].cb) |
| build_canonical_huff(atrac3p_spectra_tabs[i].cb, |
| atrac3p_spectra_tabs[i].xlat, |
| &tab_offset, &spec_vlc_tabs[i]); |
| else |
| spec_vlc_tabs[i].table = 0; |
| } |
| |
| /* build huffman tables for gain data decoding */ |
| for (i = 0; i < 11; i++) |
| build_canonical_huff(gain_cbs[i], gain_xlats[i], &tab_offset, &gain_vlc_tabs[i]); |
| |
| /* build huffman tables for tone decoding */ |
| for (i = 0; i < 7; i++) |
| build_canonical_huff(tone_cbs[i], tone_xlats[i], &tab_offset, &tone_vlc_tabs[i]); |
| } |
| |
| /** |
| * Decode number of coded quantization units. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] chan ptr to the channel parameters |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] avctx ptr to the AVCodecContext |
| * @return result code: 0 = OK, otherwise - error code |
| */ |
| static int num_coded_units(GetBitContext *gb, Atrac3pChanParams *chan, |
| Atrac3pChanUnitCtx *ctx, AVCodecContext *avctx) |
| { |
| chan->fill_mode = get_bits(gb, 2); |
| if (!chan->fill_mode) { |
| chan->num_coded_vals = ctx->num_quant_units; |
| } else { |
| chan->num_coded_vals = get_bits(gb, 5); |
| if (chan->num_coded_vals > ctx->num_quant_units) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Invalid number of transmitted units!\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if (chan->fill_mode == 3) |
| chan->split_point = get_bits(gb, 2) + (chan->ch_num << 1) + 1; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Add weighting coefficients to the decoded word-length information. |
| * |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in,out] chan ptr to the channel parameters |
| * @param[in] wtab_idx index of the table of weights |
| * @param[in] avctx ptr to the AVCodecContext |
| * @return result code: 0 = OK, otherwise - error code |
| */ |
| static int add_wordlen_weights(Atrac3pChanUnitCtx *ctx, |
| Atrac3pChanParams *chan, int wtab_idx, |
| AVCodecContext *avctx) |
| { |
| int i; |
| const int8_t *weights_tab = |
| &atrac3p_wl_weights[chan->ch_num * 3 + wtab_idx - 1][0]; |
| |
| for (i = 0; i < ctx->num_quant_units; i++) { |
| chan->qu_wordlen[i] += weights_tab[i]; |
| if (chan->qu_wordlen[i] < 0 || chan->qu_wordlen[i] > 7) { |
| av_log(avctx, AV_LOG_ERROR, |
| "WL index out of range: pos=%d, val=%d!\n", |
| i, chan->qu_wordlen[i]); |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Subtract weighting coefficients from decoded scalefactors. |
| * |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in,out] chan ptr to the channel parameters |
| * @param[in] wtab_idx index of table of weights |
| * @param[in] avctx ptr to the AVCodecContext |
| * @return result code: 0 = OK, otherwise - error code |
| */ |
| static int subtract_sf_weights(Atrac3pChanUnitCtx *ctx, |
| Atrac3pChanParams *chan, int wtab_idx, |
| AVCodecContext *avctx) |
| { |
| int i; |
| const int8_t *weights_tab = &atrac3p_sf_weights[wtab_idx - 1][0]; |
| |
| for (i = 0; i < ctx->used_quant_units; i++) { |
| chan->qu_sf_idx[i] -= weights_tab[i]; |
| if (chan->qu_sf_idx[i] < 0 || chan->qu_sf_idx[i] > 63) { |
| av_log(avctx, AV_LOG_ERROR, |
| "SF index out of range: pos=%d, val=%d!\n", |
| i, chan->qu_sf_idx[i]); |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Unpack vector quantization tables. |
| * |
| * @param[in] start_val start value for the unpacked table |
| * @param[in] shape_vec ptr to table to unpack |
| * @param[out] dst ptr to output array |
| * @param[in] num_values number of values to unpack |
| */ |
| static inline void unpack_vq_shape(int start_val, const int8_t *shape_vec, |
| int *dst, int num_values) |
| { |
| int i; |
| |
| if (num_values) { |
| dst[0] = dst[1] = dst[2] = start_val; |
| for (i = 3; i < num_values; i++) |
| dst[i] = start_val - shape_vec[atrac3p_qu_num_to_seg[i] - 1]; |
| } |
| } |
| |
| #define UNPACK_SF_VQ_SHAPE(gb, dst, num_vals) \ |
| start_val = get_bits((gb), 6); \ |
| unpack_vq_shape(start_val, &atrac3p_sf_shapes[get_bits((gb), 6)][0], \ |
| (dst), (num_vals)) |
| |
| /** |
| * Decode word length for each quantization unit of a channel. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] ch_num channel to process |
| * @param[in] avctx ptr to the AVCodecContext |
| * @return result code: 0 = OK, otherwise - error code |
| */ |
| static int decode_channel_wordlen(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int ch_num, AVCodecContext *avctx) |
| { |
| int i, weight_idx = 0, delta, diff, pos, delta_bits, min_val, flag, |
| ret, start_val; |
| VLC *vlc_tab; |
| Atrac3pChanParams *chan = &ctx->channels[ch_num]; |
| Atrac3pChanParams *ref_chan = &ctx->channels[0]; |
| |
| chan->fill_mode = 0; |
| |
| switch (get_bits(gb, 2)) { /* switch according to coding mode */ |
| case 0: /* coded using constant number of bits */ |
| for (i = 0; i < ctx->num_quant_units; i++) |
| chan->qu_wordlen[i] = get_bits(gb, 3); |
| break; |
| case 1: |
| if (ch_num) { |
| if ((ret = num_coded_units(gb, chan, ctx, avctx)) < 0) |
| return ret; |
| |
| if (chan->num_coded_vals) { |
| vlc_tab = &wl_vlc_tabs[get_bits(gb, 2)]; |
| |
| for (i = 0; i < chan->num_coded_vals; i++) { |
| delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| chan->qu_wordlen[i] = (ref_chan->qu_wordlen[i] + delta) & 7; |
| } |
| } |
| } else { |
| weight_idx = get_bits(gb, 2); |
| if ((ret = num_coded_units(gb, chan, ctx, avctx)) < 0) |
| return ret; |
| |
| if (chan->num_coded_vals) { |
| pos = get_bits(gb, 5); |
| if (pos > chan->num_coded_vals) { |
| av_log(avctx, AV_LOG_ERROR, |
| "WL mode 1: invalid position!\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| delta_bits = get_bits(gb, 2); |
| min_val = get_bits(gb, 3); |
| |
| for (i = 0; i < pos; i++) |
| chan->qu_wordlen[i] = get_bits(gb, 3); |
| |
| for (i = pos; i < chan->num_coded_vals; i++) |
| chan->qu_wordlen[i] = (min_val + get_bitsz(gb, delta_bits)) & 7; |
| } |
| } |
| break; |
| case 2: |
| if ((ret = num_coded_units(gb, chan, ctx, avctx)) < 0) |
| return ret; |
| |
| if (ch_num && chan->num_coded_vals) { |
| vlc_tab = &wl_vlc_tabs[get_bits(gb, 2)]; |
| delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| chan->qu_wordlen[0] = (ref_chan->qu_wordlen[0] + delta) & 7; |
| |
| for (i = 1; i < chan->num_coded_vals; i++) { |
| diff = ref_chan->qu_wordlen[i] - ref_chan->qu_wordlen[i - 1]; |
| delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| chan->qu_wordlen[i] = (chan->qu_wordlen[i - 1] + diff + delta) & 7; |
| } |
| } else if (chan->num_coded_vals) { |
| flag = get_bits(gb, 1); |
| vlc_tab = &wl_vlc_tabs[get_bits(gb, 1)]; |
| |
| start_val = get_bits(gb, 3); |
| unpack_vq_shape(start_val, |
| &atrac3p_wl_shapes[start_val][get_bits(gb, 4)][0], |
| chan->qu_wordlen, chan->num_coded_vals); |
| |
| if (!flag) { |
| for (i = 0; i < chan->num_coded_vals; i++) { |
| delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| chan->qu_wordlen[i] = (chan->qu_wordlen[i] + delta) & 7; |
| } |
| } else { |
| for (i = 0; i < (chan->num_coded_vals & - 2); i += 2) |
| if (!get_bits1(gb)) { |
| chan->qu_wordlen[i] = (chan->qu_wordlen[i] + |
| get_vlc2(gb, vlc_tab->table, |
| vlc_tab->bits, 1)) & 7; |
| chan->qu_wordlen[i + 1] = (chan->qu_wordlen[i + 1] + |
| get_vlc2(gb, vlc_tab->table, |
| vlc_tab->bits, 1)) & 7; |
| } |
| |
| if (chan->num_coded_vals & 1) |
| chan->qu_wordlen[i] = (chan->qu_wordlen[i] + |
| get_vlc2(gb, vlc_tab->table, |
| vlc_tab->bits, 1)) & 7; |
| } |
| } |
| break; |
| case 3: |
| weight_idx = get_bits(gb, 2); |
| if ((ret = num_coded_units(gb, chan, ctx, avctx)) < 0) |
| return ret; |
| |
| if (chan->num_coded_vals) { |
| vlc_tab = &wl_vlc_tabs[get_bits(gb, 2)]; |
| |
| /* first coefficient is coded directly */ |
| chan->qu_wordlen[0] = get_bits(gb, 3); |
| |
| for (i = 1; i < chan->num_coded_vals; i++) { |
| delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| chan->qu_wordlen[i] = (chan->qu_wordlen[i - 1] + delta) & 7; |
| } |
| } |
| break; |
| } |
| |
| if (chan->fill_mode == 2) { |
| for (i = chan->num_coded_vals; i < ctx->num_quant_units; i++) |
| chan->qu_wordlen[i] = ch_num ? get_bits1(gb) : 1; |
| } else if (chan->fill_mode == 3) { |
| pos = ch_num ? chan->num_coded_vals + chan->split_point |
| : ctx->num_quant_units - chan->split_point; |
| for (i = chan->num_coded_vals; i < pos; i++) |
| chan->qu_wordlen[i] = 1; |
| } |
| |
| if (weight_idx) |
| return add_wordlen_weights(ctx, chan, weight_idx, avctx); |
| |
| return 0; |
| } |
| |
| /** |
| * Decode scale factor indexes for each quant unit of a channel. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] ch_num channel to process |
| * @param[in] avctx ptr to the AVCodecContext |
| * @return result code: 0 = OK, otherwise - error code |
| */ |
| static int decode_channel_sf_idx(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int ch_num, AVCodecContext *avctx) |
| { |
| int i, weight_idx = 0, delta, diff, num_long_vals, |
| delta_bits, min_val, vlc_sel, start_val; |
| VLC *vlc_tab; |
| Atrac3pChanParams *chan = &ctx->channels[ch_num]; |
| Atrac3pChanParams *ref_chan = &ctx->channels[0]; |
| |
| switch (get_bits(gb, 2)) { /* switch according to coding mode */ |
| case 0: /* coded using constant number of bits */ |
| for (i = 0; i < ctx->used_quant_units; i++) |
| chan->qu_sf_idx[i] = get_bits(gb, 6); |
| break; |
| case 1: |
| if (ch_num) { |
| vlc_tab = &sf_vlc_tabs[get_bits(gb, 2)]; |
| |
| for (i = 0; i < ctx->used_quant_units; i++) { |
| delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| chan->qu_sf_idx[i] = (ref_chan->qu_sf_idx[i] + delta) & 0x3F; |
| } |
| } else { |
| weight_idx = get_bits(gb, 2); |
| if (weight_idx == 3) { |
| UNPACK_SF_VQ_SHAPE(gb, chan->qu_sf_idx, ctx->used_quant_units); |
| |
| num_long_vals = get_bits(gb, 5); |
| delta_bits = get_bits(gb, 2); |
| min_val = get_bits(gb, 4) - 7; |
| |
| for (i = 0; i < num_long_vals; i++) |
| chan->qu_sf_idx[i] = (chan->qu_sf_idx[i] + |
| get_bits(gb, 4) - 7) & 0x3F; |
| |
| /* all others are: min_val + delta */ |
| for (i = num_long_vals; i < ctx->used_quant_units; i++) |
| chan->qu_sf_idx[i] = (chan->qu_sf_idx[i] + min_val + |
| get_bitsz(gb, delta_bits)) & 0x3F; |
| } else { |
| num_long_vals = get_bits(gb, 5); |
| delta_bits = get_bits(gb, 3); |
| min_val = get_bits(gb, 6); |
| if (num_long_vals > ctx->used_quant_units || delta_bits == 7) { |
| av_log(avctx, AV_LOG_ERROR, |
| "SF mode 1: invalid parameters!\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| /* read full-precision SF indexes */ |
| for (i = 0; i < num_long_vals; i++) |
| chan->qu_sf_idx[i] = get_bits(gb, 6); |
| |
| /* all others are: min_val + delta */ |
| for (i = num_long_vals; i < ctx->used_quant_units; i++) |
| chan->qu_sf_idx[i] = (min_val + |
| get_bitsz(gb, delta_bits)) & 0x3F; |
| } |
| } |
| break; |
| case 2: |
| if (ch_num) { |
| vlc_tab = &sf_vlc_tabs[get_bits(gb, 2)]; |
| |
| delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| chan->qu_sf_idx[0] = (ref_chan->qu_sf_idx[0] + delta) & 0x3F; |
| |
| for (i = 1; i < ctx->used_quant_units; i++) { |
| diff = ref_chan->qu_sf_idx[i] - ref_chan->qu_sf_idx[i - 1]; |
| delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| chan->qu_sf_idx[i] = (chan->qu_sf_idx[i - 1] + diff + delta) & 0x3F; |
| } |
| } else { |
| vlc_tab = &sf_vlc_tabs[get_bits(gb, 2) + 4]; |
| |
| UNPACK_SF_VQ_SHAPE(gb, chan->qu_sf_idx, ctx->used_quant_units); |
| |
| for (i = 0; i < ctx->used_quant_units; i++) { |
| delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| chan->qu_sf_idx[i] = (chan->qu_sf_idx[i] + |
| sign_extend(delta, 4)) & 0x3F; |
| } |
| } |
| break; |
| case 3: |
| if (ch_num) { |
| /* copy coefficients from reference channel */ |
| for (i = 0; i < ctx->used_quant_units; i++) |
| chan->qu_sf_idx[i] = ref_chan->qu_sf_idx[i]; |
| } else { |
| weight_idx = get_bits(gb, 2); |
| vlc_sel = get_bits(gb, 2); |
| vlc_tab = &sf_vlc_tabs[vlc_sel]; |
| |
| if (weight_idx == 3) { |
| vlc_tab = &sf_vlc_tabs[vlc_sel + 4]; |
| |
| UNPACK_SF_VQ_SHAPE(gb, chan->qu_sf_idx, ctx->used_quant_units); |
| |
| diff = (get_bits(gb, 4) + 56) & 0x3F; |
| chan->qu_sf_idx[0] = (chan->qu_sf_idx[0] + diff) & 0x3F; |
| |
| for (i = 1; i < ctx->used_quant_units; i++) { |
| delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| diff = (diff + sign_extend(delta, 4)) & 0x3F; |
| chan->qu_sf_idx[i] = (diff + chan->qu_sf_idx[i]) & 0x3F; |
| } |
| } else { |
| /* 1st coefficient is coded directly */ |
| chan->qu_sf_idx[0] = get_bits(gb, 6); |
| |
| for (i = 1; i < ctx->used_quant_units; i++) { |
| delta = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| chan->qu_sf_idx[i] = (chan->qu_sf_idx[i - 1] + delta) & 0x3F; |
| } |
| } |
| } |
| break; |
| } |
| |
| if (weight_idx && weight_idx < 3) |
| return subtract_sf_weights(ctx, chan, weight_idx, avctx); |
| |
| return 0; |
| } |
| |
| /** |
| * Decode word length information for each channel. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] num_channels number of channels to process |
| * @param[in] avctx ptr to the AVCodecContext |
| * @return result code: 0 = OK, otherwise - error code |
| */ |
| static int decode_quant_wordlen(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int num_channels, AVCodecContext *avctx) |
| { |
| int ch_num, i, ret; |
| |
| for (ch_num = 0; ch_num < num_channels; ch_num++) { |
| memset(ctx->channels[ch_num].qu_wordlen, 0, |
| sizeof(ctx->channels[ch_num].qu_wordlen)); |
| |
| if ((ret = decode_channel_wordlen(gb, ctx, ch_num, avctx)) < 0) |
| return ret; |
| } |
| |
| /* scan for last non-zero coeff in both channels and |
| * set number of quant units having coded spectrum */ |
| for (i = ctx->num_quant_units - 1; i >= 0; i--) |
| if (ctx->channels[0].qu_wordlen[i] || |
| (num_channels == 2 && ctx->channels[1].qu_wordlen[i])) |
| break; |
| ctx->used_quant_units = i + 1; |
| |
| return 0; |
| } |
| |
| /** |
| * Decode scale factor indexes for each channel. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] num_channels number of channels to process |
| * @param[in] avctx ptr to the AVCodecContext |
| * @return result code: 0 = OK, otherwise - error code |
| */ |
| static int decode_scale_factors(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int num_channels, AVCodecContext *avctx) |
| { |
| int ch_num, ret; |
| |
| if (!ctx->used_quant_units) |
| return 0; |
| |
| for (ch_num = 0; ch_num < num_channels; ch_num++) { |
| memset(ctx->channels[ch_num].qu_sf_idx, 0, |
| sizeof(ctx->channels[ch_num].qu_sf_idx)); |
| |
| if ((ret = decode_channel_sf_idx(gb, ctx, ch_num, avctx)) < 0) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Decode number of code table values. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] avctx ptr to the AVCodecContext |
| * @return result code: 0 = OK, otherwise - error code |
| */ |
| static int get_num_ct_values(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| AVCodecContext *avctx) |
| { |
| int num_coded_vals; |
| |
| if (get_bits1(gb)) { |
| num_coded_vals = get_bits(gb, 5); |
| if (num_coded_vals > ctx->used_quant_units) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Invalid number of code table indexes: %d!\n", num_coded_vals); |
| return AVERROR_INVALIDDATA; |
| } |
| return num_coded_vals; |
| } else |
| return ctx->used_quant_units; |
| } |
| |
| #define DEC_CT_IDX_COMMON(OP) \ |
| num_vals = get_num_ct_values(gb, ctx, avctx); \ |
| if (num_vals < 0) \ |
| return num_vals; \ |
| \ |
| for (i = 0; i < num_vals; i++) { \ |
| if (chan->qu_wordlen[i]) { \ |
| chan->qu_tab_idx[i] = OP; \ |
| } else if (ch_num && ref_chan->qu_wordlen[i]) \ |
| /* get clone master flag */ \ |
| chan->qu_tab_idx[i] = get_bits1(gb); \ |
| } |
| |
| #define CODING_DIRECT get_bits(gb, num_bits) |
| |
| #define CODING_VLC get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1) |
| |
| #define CODING_VLC_DELTA \ |
| (!i) ? CODING_VLC \ |
| : (pred + get_vlc2(gb, delta_vlc->table, \ |
| delta_vlc->bits, 1)) & mask; \ |
| pred = chan->qu_tab_idx[i] |
| |
| #define CODING_VLC_DIFF \ |
| (ref_chan->qu_tab_idx[i] + \ |
| get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1)) & mask |
| |
| /** |
| * Decode code table indexes for each quant unit of a channel. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] ch_num channel to process |
| * @param[in] avctx ptr to the AVCodecContext |
| * @return result code: 0 = OK, otherwise - error code |
| */ |
| static int decode_channel_code_tab(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int ch_num, AVCodecContext *avctx) |
| { |
| int i, num_vals, num_bits, pred; |
| int mask = ctx->use_full_table ? 7 : 3; /* mask for modular arithmetic */ |
| VLC *vlc_tab, *delta_vlc; |
| Atrac3pChanParams *chan = &ctx->channels[ch_num]; |
| Atrac3pChanParams *ref_chan = &ctx->channels[0]; |
| |
| chan->table_type = get_bits1(gb); |
| |
| switch (get_bits(gb, 2)) { /* switch according to coding mode */ |
| case 0: /* directly coded */ |
| num_bits = ctx->use_full_table + 2; |
| DEC_CT_IDX_COMMON(CODING_DIRECT); |
| break; |
| case 1: /* entropy-coded */ |
| vlc_tab = ctx->use_full_table ? &ct_vlc_tabs[1] |
| : ct_vlc_tabs; |
| DEC_CT_IDX_COMMON(CODING_VLC); |
| break; |
| case 2: /* entropy-coded delta */ |
| if (ctx->use_full_table) { |
| vlc_tab = &ct_vlc_tabs[1]; |
| delta_vlc = &ct_vlc_tabs[2]; |
| } else { |
| vlc_tab = ct_vlc_tabs; |
| delta_vlc = ct_vlc_tabs; |
| } |
| pred = 0; |
| DEC_CT_IDX_COMMON(CODING_VLC_DELTA); |
| break; |
| case 3: /* entropy-coded difference to master */ |
| if (ch_num) { |
| vlc_tab = ctx->use_full_table ? &ct_vlc_tabs[3] |
| : ct_vlc_tabs; |
| DEC_CT_IDX_COMMON(CODING_VLC_DIFF); |
| } |
| break; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Decode code table indexes for each channel. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] num_channels number of channels to process |
| * @param[in] avctx ptr to the AVCodecContext |
| * @return result code: 0 = OK, otherwise - error code |
| */ |
| static int decode_code_table_indexes(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int num_channels, AVCodecContext *avctx) |
| { |
| int ch_num, ret; |
| |
| if (!ctx->used_quant_units) |
| return 0; |
| |
| ctx->use_full_table = get_bits1(gb); |
| |
| for (ch_num = 0; ch_num < num_channels; ch_num++) { |
| memset(ctx->channels[ch_num].qu_tab_idx, 0, |
| sizeof(ctx->channels[ch_num].qu_tab_idx)); |
| |
| if ((ret = decode_channel_code_tab(gb, ctx, ch_num, avctx)) < 0) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Decode huffman-coded spectral lines for a given quant unit. |
| * |
| * This is a generalized version for all known coding modes. |
| * Its speed can be improved by creating separate functions for each mode. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in] tab code table telling how to decode spectral lines |
| * @param[in] vlc_tab ptr to the huffman table associated with the code table |
| * @param[out] out pointer to buffer where decoded data should be stored |
| * @param[in] num_specs number of spectral lines to decode |
| */ |
| static void decode_qu_spectra(GetBitContext *gb, const Atrac3pSpecCodeTab *tab, |
| VLC *vlc_tab, int16_t *out, const int num_specs) |
| { |
| int i, j, pos, cf; |
| int group_size = tab->group_size; |
| int num_coeffs = tab->num_coeffs; |
| int bits = tab->bits; |
| int is_signed = tab->is_signed; |
| unsigned val; |
| |
| for (pos = 0; pos < num_specs;) { |
| if (group_size == 1 || get_bits1(gb)) { |
| for (j = 0; j < group_size; j++) { |
| val = get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1); |
| |
| for (i = 0; i < num_coeffs; i++) { |
| cf = av_mod_uintp2(val, bits); |
| if (is_signed) |
| cf = sign_extend(cf, bits); |
| else if (cf && get_bits1(gb)) |
| cf = -cf; |
| |
| out[pos++] = cf; |
| val >>= bits; |
| } |
| } |
| } else /* group skipped */ |
| pos += group_size * num_coeffs; |
| } |
| } |
| |
| /** |
| * Decode huffman-coded IMDCT spectrum for all channels. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] num_channels number of channels to process |
| * @param[in] avctx ptr to the AVCodecContext |
| */ |
| static void decode_spectrum(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int num_channels, AVCodecContext *avctx) |
| { |
| int i, ch_num, qu, wordlen, codetab, tab_index, num_specs; |
| const Atrac3pSpecCodeTab *tab; |
| Atrac3pChanParams *chan; |
| |
| for (ch_num = 0; ch_num < num_channels; ch_num++) { |
| chan = &ctx->channels[ch_num]; |
| |
| memset(chan->spectrum, 0, sizeof(chan->spectrum)); |
| |
| /* set power compensation level to disabled */ |
| memset(chan->power_levs, ATRAC3P_POWER_COMP_OFF, sizeof(chan->power_levs)); |
| |
| for (qu = 0; qu < ctx->used_quant_units; qu++) { |
| num_specs = ff_atrac3p_qu_to_spec_pos[qu + 1] - |
| ff_atrac3p_qu_to_spec_pos[qu]; |
| |
| wordlen = chan->qu_wordlen[qu]; |
| codetab = chan->qu_tab_idx[qu]; |
| if (wordlen) { |
| if (!ctx->use_full_table) |
| codetab = atrac3p_ct_restricted_to_full[chan->table_type][wordlen - 1][codetab]; |
| |
| tab_index = (chan->table_type * 8 + codetab) * 7 + wordlen - 1; |
| tab = &atrac3p_spectra_tabs[tab_index]; |
| |
| /* this allows reusing VLC tables */ |
| if (tab->redirect >= 0) |
| tab_index = tab->redirect; |
| |
| decode_qu_spectra(gb, tab, &spec_vlc_tabs[tab_index], |
| &chan->spectrum[ff_atrac3p_qu_to_spec_pos[qu]], |
| num_specs); |
| } else if (ch_num && ctx->channels[0].qu_wordlen[qu] && !codetab) { |
| /* copy coefficients from master */ |
| memcpy(&chan->spectrum[ff_atrac3p_qu_to_spec_pos[qu]], |
| &ctx->channels[0].spectrum[ff_atrac3p_qu_to_spec_pos[qu]], |
| num_specs * |
| sizeof(chan->spectrum[ff_atrac3p_qu_to_spec_pos[qu]])); |
| chan->qu_wordlen[qu] = ctx->channels[0].qu_wordlen[qu]; |
| } |
| } |
| |
| /* Power compensation levels only present in the bitstream |
| * if there are more than 2 quant units. The lowest two units |
| * correspond to the frequencies 0...351 Hz, whose shouldn't |
| * be affected by the power compensation. */ |
| if (ctx->used_quant_units > 2) { |
| num_specs = atrac3p_subband_to_num_powgrps[ctx->num_coded_subbands - 1]; |
| for (i = 0; i < num_specs; i++) |
| chan->power_levs[i] = get_bits(gb, 4); |
| } |
| } |
| } |
| |
| /** |
| * Retrieve specified amount of flag bits from the input bitstream. |
| * The data can be shortened in the case of the following two common conditions: |
| * if all bits are zero then only one signal bit = 0 will be stored, |
| * if all bits are ones then two signal bits = 1,0 will be stored. |
| * Otherwise, all necessary bits will be directly stored |
| * prefixed by two signal bits = 1,1. |
| * |
| * @param[in] gb ptr to the GetBitContext |
| * @param[out] out where to place decoded flags |
| * @param[in] num_flags number of flags to process |
| * @return: 0 = all flag bits are zero, 1 = there is at least one non-zero flag bit |
| */ |
| static int get_subband_flags(GetBitContext *gb, uint8_t *out, int num_flags) |
| { |
| int i, result; |
| |
| memset(out, 0, num_flags); |
| |
| result = get_bits1(gb); |
| if (result) { |
| if (get_bits1(gb)) |
| for (i = 0; i < num_flags; i++) |
| out[i] = get_bits1(gb); |
| else |
| memset(out, 1, num_flags); |
| } |
| |
| return result; |
| } |
| |
| /** |
| * Decode mdct window shape flags for all channels. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] num_channels number of channels to process |
| */ |
| static void decode_window_shape(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int num_channels) |
| { |
| int ch_num; |
| |
| for (ch_num = 0; ch_num < num_channels; ch_num++) |
| get_subband_flags(gb, ctx->channels[ch_num].wnd_shape, |
| ctx->num_subbands); |
| } |
| |
| /** |
| * Decode number of gain control points. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] ch_num channel to process |
| * @param[in] coded_subbands number of subbands to process |
| * @return result code: 0 = OK, otherwise - error code |
| */ |
| static int decode_gainc_npoints(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int ch_num, int coded_subbands) |
| { |
| int i, delta, delta_bits, min_val; |
| Atrac3pChanParams *chan = &ctx->channels[ch_num]; |
| Atrac3pChanParams *ref_chan = &ctx->channels[0]; |
| |
| switch (get_bits(gb, 2)) { /* switch according to coding mode */ |
| case 0: /* fixed-length coding */ |
| for (i = 0; i < coded_subbands; i++) |
| chan->gain_data[i].num_points = get_bits(gb, 3); |
| break; |
| case 1: /* variable-length coding */ |
| for (i = 0; i < coded_subbands; i++) |
| chan->gain_data[i].num_points = |
| get_vlc2(gb, gain_vlc_tabs[0].table, |
| gain_vlc_tabs[0].bits, 1); |
| break; |
| case 2: |
| if (ch_num) { /* VLC modulo delta to master channel */ |
| for (i = 0; i < coded_subbands; i++) { |
| delta = get_vlc2(gb, gain_vlc_tabs[1].table, |
| gain_vlc_tabs[1].bits, 1); |
| chan->gain_data[i].num_points = |
| (ref_chan->gain_data[i].num_points + delta) & 7; |
| } |
| } else { /* VLC modulo delta to previous */ |
| chan->gain_data[0].num_points = |
| get_vlc2(gb, gain_vlc_tabs[0].table, |
| gain_vlc_tabs[0].bits, 1); |
| |
| for (i = 1; i < coded_subbands; i++) { |
| delta = get_vlc2(gb, gain_vlc_tabs[1].table, |
| gain_vlc_tabs[1].bits, 1); |
| chan->gain_data[i].num_points = |
| (chan->gain_data[i - 1].num_points + delta) & 7; |
| } |
| } |
| break; |
| case 3: |
| if (ch_num) { /* copy data from master channel */ |
| for (i = 0; i < coded_subbands; i++) |
| chan->gain_data[i].num_points = |
| ref_chan->gain_data[i].num_points; |
| } else { /* shorter delta to min */ |
| delta_bits = get_bits(gb, 2); |
| min_val = get_bits(gb, 3); |
| |
| for (i = 0; i < coded_subbands; i++) { |
| chan->gain_data[i].num_points = min_val + get_bitsz(gb, delta_bits); |
| if (chan->gain_data[i].num_points > 7) |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Implements coding mode 3 (slave) for gain compensation levels. |
| * |
| * @param[out] dst ptr to the output array |
| * @param[in] ref ptr to the reference channel |
| */ |
| static inline void gainc_level_mode3s(AtracGainInfo *dst, AtracGainInfo *ref) |
| { |
| int i; |
| |
| for (i = 0; i < dst->num_points; i++) |
| dst->lev_code[i] = (i >= ref->num_points) ? 7 : ref->lev_code[i]; |
| } |
| |
| /** |
| * Implements coding mode 1 (master) for gain compensation levels. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in] ctx ptr to the channel unit context |
| * @param[out] dst ptr to the output array |
| */ |
| static inline void gainc_level_mode1m(GetBitContext *gb, |
| Atrac3pChanUnitCtx *ctx, |
| AtracGainInfo *dst) |
| { |
| int i, delta; |
| |
| if (dst->num_points > 0) |
| dst->lev_code[0] = get_vlc2(gb, gain_vlc_tabs[2].table, |
| gain_vlc_tabs[2].bits, 1); |
| |
| for (i = 1; i < dst->num_points; i++) { |
| delta = get_vlc2(gb, gain_vlc_tabs[3].table, |
| gain_vlc_tabs[3].bits, 1); |
| dst->lev_code[i] = (dst->lev_code[i - 1] + delta) & 0xF; |
| } |
| } |
| |
| /** |
| * Decode level code for each gain control point. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] ch_num channel to process |
| * @param[in] coded_subbands number of subbands to process |
| * @return result code: 0 = OK, otherwise - error code |
| */ |
| static int decode_gainc_levels(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int ch_num, int coded_subbands) |
| { |
| int sb, i, delta, delta_bits, min_val, pred; |
| Atrac3pChanParams *chan = &ctx->channels[ch_num]; |
| Atrac3pChanParams *ref_chan = &ctx->channels[0]; |
| |
| switch (get_bits(gb, 2)) { /* switch according to coding mode */ |
| case 0: /* fixed-length coding */ |
| for (sb = 0; sb < coded_subbands; sb++) |
| for (i = 0; i < chan->gain_data[sb].num_points; i++) |
| chan->gain_data[sb].lev_code[i] = get_bits(gb, 4); |
| break; |
| case 1: |
| if (ch_num) { /* VLC modulo delta to master channel */ |
| for (sb = 0; sb < coded_subbands; sb++) |
| for (i = 0; i < chan->gain_data[sb].num_points; i++) { |
| delta = get_vlc2(gb, gain_vlc_tabs[5].table, |
| gain_vlc_tabs[5].bits, 1); |
| pred = (i >= ref_chan->gain_data[sb].num_points) |
| ? 7 : ref_chan->gain_data[sb].lev_code[i]; |
| chan->gain_data[sb].lev_code[i] = (pred + delta) & 0xF; |
| } |
| } else { /* VLC modulo delta to previous */ |
| for (sb = 0; sb < coded_subbands; sb++) |
| gainc_level_mode1m(gb, ctx, &chan->gain_data[sb]); |
| } |
| break; |
| case 2: |
| if (ch_num) { /* VLC modulo delta to previous or clone master */ |
| for (sb = 0; sb < coded_subbands; sb++) |
| if (chan->gain_data[sb].num_points > 0) { |
| if (get_bits1(gb)) |
| gainc_level_mode1m(gb, ctx, &chan->gain_data[sb]); |
| else |
| gainc_level_mode3s(&chan->gain_data[sb], |
| &ref_chan->gain_data[sb]); |
| } |
| } else { /* VLC modulo delta to lev_codes of previous subband */ |
| if (chan->gain_data[0].num_points > 0) |
| gainc_level_mode1m(gb, ctx, &chan->gain_data[0]); |
| |
| for (sb = 1; sb < coded_subbands; sb++) |
| for (i = 0; i < chan->gain_data[sb].num_points; i++) { |
| delta = get_vlc2(gb, gain_vlc_tabs[4].table, |
| gain_vlc_tabs[4].bits, 1); |
| pred = (i >= chan->gain_data[sb - 1].num_points) |
| ? 7 : chan->gain_data[sb - 1].lev_code[i]; |
| chan->gain_data[sb].lev_code[i] = (pred + delta) & 0xF; |
| } |
| } |
| break; |
| case 3: |
| if (ch_num) { /* clone master */ |
| for (sb = 0; sb < coded_subbands; sb++) |
| gainc_level_mode3s(&chan->gain_data[sb], |
| &ref_chan->gain_data[sb]); |
| } else { /* shorter delta to min */ |
| delta_bits = get_bits(gb, 2); |
| min_val = get_bits(gb, 4); |
| |
| for (sb = 0; sb < coded_subbands; sb++) |
| for (i = 0; i < chan->gain_data[sb].num_points; i++) { |
| chan->gain_data[sb].lev_code[i] = min_val + get_bitsz(gb, delta_bits); |
| if (chan->gain_data[sb].lev_code[i] > 15) |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| break; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Implements coding mode 0 for gain compensation locations. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in] ctx ptr to the channel unit context |
| * @param[out] dst ptr to the output array |
| * @param[in] pos position of the value to be processed |
| */ |
| static inline void gainc_loc_mode0(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| AtracGainInfo *dst, int pos) |
| { |
| int delta_bits; |
| |
| if (!pos || dst->loc_code[pos - 1] < 15) |
| dst->loc_code[pos] = get_bits(gb, 5); |
| else if (dst->loc_code[pos - 1] >= 30) |
| dst->loc_code[pos] = 31; |
| else { |
| delta_bits = av_log2(30 - dst->loc_code[pos - 1]) + 1; |
| dst->loc_code[pos] = dst->loc_code[pos - 1] + |
| get_bits(gb, delta_bits) + 1; |
| } |
| } |
| |
| /** |
| * Implements coding mode 1 for gain compensation locations. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in] ctx ptr to the channel unit context |
| * @param[out] dst ptr to the output array |
| */ |
| static inline void gainc_loc_mode1(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| AtracGainInfo *dst) |
| { |
| int i; |
| VLC *tab; |
| |
| if (dst->num_points > 0) { |
| /* 1st coefficient is stored directly */ |
| dst->loc_code[0] = get_bits(gb, 5); |
| |
| for (i = 1; i < dst->num_points; i++) { |
| /* switch VLC according to the curve direction |
| * (ascending/descending) */ |
| tab = (dst->lev_code[i] <= dst->lev_code[i - 1]) |
| ? &gain_vlc_tabs[7] |
| : &gain_vlc_tabs[9]; |
| dst->loc_code[i] = dst->loc_code[i - 1] + |
| get_vlc2(gb, tab->table, tab->bits, 1); |
| } |
| } |
| } |
| |
| /** |
| * Decode location code for each gain control point. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] ch_num channel to process |
| * @param[in] coded_subbands number of subbands to process |
| * @param[in] avctx ptr to the AVCodecContext |
| * @return result code: 0 = OK, otherwise - error code |
| */ |
| static int decode_gainc_loc_codes(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int ch_num, int coded_subbands, |
| AVCodecContext *avctx) |
| { |
| int sb, i, delta, delta_bits, min_val, pred, more_than_ref; |
| AtracGainInfo *dst, *ref; |
| VLC *tab; |
| Atrac3pChanParams *chan = &ctx->channels[ch_num]; |
| Atrac3pChanParams *ref_chan = &ctx->channels[0]; |
| |
| switch (get_bits(gb, 2)) { /* switch according to coding mode */ |
| case 0: /* sequence of numbers in ascending order */ |
| for (sb = 0; sb < coded_subbands; sb++) |
| for (i = 0; i < chan->gain_data[sb].num_points; i++) |
| gainc_loc_mode0(gb, ctx, &chan->gain_data[sb], i); |
| break; |
| case 1: |
| if (ch_num) { |
| for (sb = 0; sb < coded_subbands; sb++) { |
| if (chan->gain_data[sb].num_points <= 0) |
| continue; |
| dst = &chan->gain_data[sb]; |
| ref = &ref_chan->gain_data[sb]; |
| |
| /* 1st value is vlc-coded modulo delta to master */ |
| delta = get_vlc2(gb, gain_vlc_tabs[10].table, |
| gain_vlc_tabs[10].bits, 1); |
| pred = ref->num_points > 0 ? ref->loc_code[0] : 0; |
| dst->loc_code[0] = (pred + delta) & 0x1F; |
| |
| for (i = 1; i < dst->num_points; i++) { |
| more_than_ref = i >= ref->num_points; |
| if (dst->lev_code[i] > dst->lev_code[i - 1]) { |
| /* ascending curve */ |
| if (more_than_ref) { |
| delta = |
| get_vlc2(gb, gain_vlc_tabs[9].table, |
| gain_vlc_tabs[9].bits, 1); |
| dst->loc_code[i] = dst->loc_code[i - 1] + delta; |
| } else { |
| if (get_bits1(gb)) |
| gainc_loc_mode0(gb, ctx, dst, i); // direct coding |
| else |
| dst->loc_code[i] = ref->loc_code[i]; // clone master |
| } |
| } else { /* descending curve */ |
| tab = more_than_ref ? &gain_vlc_tabs[7] |
| : &gain_vlc_tabs[10]; |
| delta = get_vlc2(gb, tab->table, tab->bits, 1); |
| if (more_than_ref) |
| dst->loc_code[i] = dst->loc_code[i - 1] + delta; |
| else |
| dst->loc_code[i] = (ref->loc_code[i] + delta) & 0x1F; |
| } |
| } |
| } |
| } else /* VLC delta to previous */ |
| for (sb = 0; sb < coded_subbands; sb++) |
| gainc_loc_mode1(gb, ctx, &chan->gain_data[sb]); |
| break; |
| case 2: |
| if (ch_num) { |
| for (sb = 0; sb < coded_subbands; sb++) { |
| if (chan->gain_data[sb].num_points <= 0) |
| continue; |
| dst = &chan->gain_data[sb]; |
| ref = &ref_chan->gain_data[sb]; |
| if (dst->num_points > ref->num_points || get_bits1(gb)) |
| gainc_loc_mode1(gb, ctx, dst); |
| else /* clone master for the whole subband */ |
| for (i = 0; i < chan->gain_data[sb].num_points; i++) |
| dst->loc_code[i] = ref->loc_code[i]; |
| } |
| } else { |
| /* data for the first subband is coded directly */ |
| for (i = 0; i < chan->gain_data[0].num_points; i++) |
| gainc_loc_mode0(gb, ctx, &chan->gain_data[0], i); |
| |
| for (sb = 1; sb < coded_subbands; sb++) { |
| if (chan->gain_data[sb].num_points <= 0) |
| continue; |
| dst = &chan->gain_data[sb]; |
| |
| /* 1st value is vlc-coded modulo delta to the corresponding |
| * value of the previous subband if any or zero */ |
| delta = get_vlc2(gb, gain_vlc_tabs[6].table, |
| gain_vlc_tabs[6].bits, 1); |
| pred = dst[-1].num_points > 0 |
| ? dst[-1].loc_code[0] : 0; |
| dst->loc_code[0] = (pred + delta) & 0x1F; |
| |
| for (i = 1; i < dst->num_points; i++) { |
| more_than_ref = i >= dst[-1].num_points; |
| /* Select VLC table according to curve direction and |
| * presence of prediction. */ |
| tab = &gain_vlc_tabs[(dst->lev_code[i] > dst->lev_code[i - 1]) * |
| 2 + more_than_ref + 6]; |
| delta = get_vlc2(gb, tab->table, tab->bits, 1); |
| if (more_than_ref) |
| dst->loc_code[i] = dst->loc_code[i - 1] + delta; |
| else |
| dst->loc_code[i] = (dst[-1].loc_code[i] + delta) & 0x1F; |
| } |
| } |
| } |
| break; |
| case 3: |
| if (ch_num) { /* clone master or direct or direct coding */ |
| for (sb = 0; sb < coded_subbands; sb++) |
| for (i = 0; i < chan->gain_data[sb].num_points; i++) { |
| if (i >= ref_chan->gain_data[sb].num_points) |
| gainc_loc_mode0(gb, ctx, &chan->gain_data[sb], i); |
| else |
| chan->gain_data[sb].loc_code[i] = |
| ref_chan->gain_data[sb].loc_code[i]; |
| } |
| } else { /* shorter delta to min */ |
| delta_bits = get_bits(gb, 2) + 1; |
| min_val = get_bits(gb, 5); |
| |
| for (sb = 0; sb < coded_subbands; sb++) |
| for (i = 0; i < chan->gain_data[sb].num_points; i++) |
| chan->gain_data[sb].loc_code[i] = min_val + i + |
| get_bits(gb, delta_bits); |
| } |
| break; |
| } |
| |
| /* Validate decoded information */ |
| for (sb = 0; sb < coded_subbands; sb++) { |
| dst = &chan->gain_data[sb]; |
| for (i = 0; i < chan->gain_data[sb].num_points; i++) { |
| if (dst->loc_code[i] < 0 || dst->loc_code[i] > 31 || |
| (i && dst->loc_code[i] <= dst->loc_code[i - 1])) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Invalid gain location: ch=%d, sb=%d, pos=%d, val=%d\n", |
| ch_num, sb, i, dst->loc_code[i]); |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Decode gain control data for all channels. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] num_channels number of channels to process |
| * @param[in] avctx ptr to the AVCodecContext |
| * @return result code: 0 = OK, otherwise - error code |
| */ |
| static int decode_gainc_data(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int num_channels, AVCodecContext *avctx) |
| { |
| int ch_num, coded_subbands, sb, ret; |
| |
| for (ch_num = 0; ch_num < num_channels; ch_num++) { |
| memset(ctx->channels[ch_num].gain_data, 0, |
| sizeof(*ctx->channels[ch_num].gain_data) * ATRAC3P_SUBBANDS); |
| |
| if (get_bits1(gb)) { /* gain control data present? */ |
| coded_subbands = get_bits(gb, 4) + 1; |
| if (get_bits1(gb)) /* is high band gain data replication on? */ |
| ctx->channels[ch_num].num_gain_subbands = get_bits(gb, 4) + 1; |
| else |
| ctx->channels[ch_num].num_gain_subbands = coded_subbands; |
| |
| if ((ret = decode_gainc_npoints(gb, ctx, ch_num, coded_subbands)) < 0 || |
| (ret = decode_gainc_levels(gb, ctx, ch_num, coded_subbands)) < 0 || |
| (ret = decode_gainc_loc_codes(gb, ctx, ch_num, coded_subbands, avctx)) < 0) |
| return ret; |
| |
| if (coded_subbands > 0) { /* propagate gain data if requested */ |
| for (sb = coded_subbands; sb < ctx->channels[ch_num].num_gain_subbands; sb++) |
| ctx->channels[ch_num].gain_data[sb] = |
| ctx->channels[ch_num].gain_data[sb - 1]; |
| } |
| } else { |
| ctx->channels[ch_num].num_gain_subbands = 0; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Decode envelope for all tones of a channel. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] ch_num channel to process |
| * @param[in] band_has_tones ptr to an array of per-band-flags: |
| * 1 - tone data present |
| */ |
| static void decode_tones_envelope(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int ch_num, int band_has_tones[]) |
| { |
| int sb; |
| Atrac3pWavesData *dst = ctx->channels[ch_num].tones_info; |
| Atrac3pWavesData *ref = ctx->channels[0].tones_info; |
| |
| if (!ch_num || !get_bits1(gb)) { /* mode 0: fixed-length coding */ |
| for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| if (!band_has_tones[sb]) |
| continue; |
| dst[sb].pend_env.has_start_point = get_bits1(gb); |
| dst[sb].pend_env.start_pos = dst[sb].pend_env.has_start_point |
| ? get_bits(gb, 5) : -1; |
| dst[sb].pend_env.has_stop_point = get_bits1(gb); |
| dst[sb].pend_env.stop_pos = dst[sb].pend_env.has_stop_point |
| ? get_bits(gb, 5) : 32; |
| } |
| } else { /* mode 1(slave only): copy master */ |
| for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| if (!band_has_tones[sb]) |
| continue; |
| dst[sb].pend_env.has_start_point = ref[sb].pend_env.has_start_point; |
| dst[sb].pend_env.has_stop_point = ref[sb].pend_env.has_stop_point; |
| dst[sb].pend_env.start_pos = ref[sb].pend_env.start_pos; |
| dst[sb].pend_env.stop_pos = ref[sb].pend_env.stop_pos; |
| } |
| } |
| } |
| |
| /** |
| * Decode number of tones for each subband of a channel. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] ch_num channel to process |
| * @param[in] band_has_tones ptr to an array of per-band-flags: |
| * 1 - tone data present |
| * @param[in] avctx ptr to the AVCodecContext |
| * @return result code: 0 = OK, otherwise - error code |
| */ |
| static int decode_band_numwavs(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int ch_num, int band_has_tones[], |
| AVCodecContext *avctx) |
| { |
| int mode, sb, delta; |
| Atrac3pWavesData *dst = ctx->channels[ch_num].tones_info; |
| Atrac3pWavesData *ref = ctx->channels[0].tones_info; |
| |
| mode = get_bits(gb, ch_num + 1); |
| switch (mode) { |
| case 0: /** fixed-length coding */ |
| for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) |
| if (band_has_tones[sb]) |
| dst[sb].num_wavs = get_bits(gb, 4); |
| break; |
| case 1: /** variable-length coding */ |
| for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) |
| if (band_has_tones[sb]) |
| dst[sb].num_wavs = |
| get_vlc2(gb, tone_vlc_tabs[1].table, |
| tone_vlc_tabs[1].bits, 1); |
| break; |
| case 2: /** VLC modulo delta to master (slave only) */ |
| for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) |
| if (band_has_tones[sb]) { |
| delta = get_vlc2(gb, tone_vlc_tabs[2].table, |
| tone_vlc_tabs[2].bits, 1); |
| delta = sign_extend(delta, 3); |
| dst[sb].num_wavs = (ref[sb].num_wavs + delta) & 0xF; |
| } |
| break; |
| case 3: /** copy master (slave only) */ |
| for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) |
| if (band_has_tones[sb]) |
| dst[sb].num_wavs = ref[sb].num_wavs; |
| break; |
| } |
| |
| /** initialize start tone index for each subband */ |
| for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) |
| if (band_has_tones[sb]) { |
| if (ctx->waves_info->tones_index + dst[sb].num_wavs > 48) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Too many tones: %d (max. 48), frame: %d!\n", |
| ctx->waves_info->tones_index + dst[sb].num_wavs, |
| avctx->frame_number); |
| return AVERROR_INVALIDDATA; |
| } |
| dst[sb].start_index = ctx->waves_info->tones_index; |
| ctx->waves_info->tones_index += dst[sb].num_wavs; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Decode frequency information for each subband of a channel. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] ch_num channel to process |
| * @param[in] band_has_tones ptr to an array of per-band-flags: |
| * 1 - tone data present |
| */ |
| static void decode_tones_frequency(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int ch_num, int band_has_tones[]) |
| { |
| int sb, i, direction, nbits, pred, delta; |
| Atrac3pWaveParam *iwav, *owav; |
| Atrac3pWavesData *dst = ctx->channels[ch_num].tones_info; |
| Atrac3pWavesData *ref = ctx->channels[0].tones_info; |
| |
| if (!ch_num || !get_bits1(gb)) { /* mode 0: fixed-length coding */ |
| for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| if (!band_has_tones[sb] || !dst[sb].num_wavs) |
| continue; |
| iwav = &ctx->waves_info->waves[dst[sb].start_index]; |
| direction = (dst[sb].num_wavs > 1) ? get_bits1(gb) : 0; |
| if (direction) { /** packed numbers in descending order */ |
| if (dst[sb].num_wavs) |
| iwav[dst[sb].num_wavs - 1].freq_index = get_bits(gb, 10); |
| for (i = dst[sb].num_wavs - 2; i >= 0 ; i--) { |
| nbits = av_log2(iwav[i+1].freq_index) + 1; |
| iwav[i].freq_index = get_bits(gb, nbits); |
| } |
| } else { /** packed numbers in ascending order */ |
| for (i = 0; i < dst[sb].num_wavs; i++) { |
| if (!i || iwav[i - 1].freq_index < 512) |
| iwav[i].freq_index = get_bits(gb, 10); |
| else { |
| nbits = av_log2(1023 - iwav[i - 1].freq_index) + 1; |
| iwav[i].freq_index = get_bits(gb, nbits) + |
| 1024 - (1 << nbits); |
| } |
| } |
| } |
| } |
| } else { /* mode 1: VLC modulo delta to master (slave only) */ |
| for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| if (!band_has_tones[sb] || !dst[sb].num_wavs) |
| continue; |
| iwav = &ctx->waves_info->waves[ref[sb].start_index]; |
| owav = &ctx->waves_info->waves[dst[sb].start_index]; |
| for (i = 0; i < dst[sb].num_wavs; i++) { |
| delta = get_vlc2(gb, tone_vlc_tabs[6].table, |
| tone_vlc_tabs[6].bits, 1); |
| delta = sign_extend(delta, 8); |
| pred = (i < ref[sb].num_wavs) ? iwav[i].freq_index : |
| (ref[sb].num_wavs ? iwav[ref[sb].num_wavs - 1].freq_index : 0); |
| owav[i].freq_index = (pred + delta) & 0x3FF; |
| } |
| } |
| } |
| } |
| |
| /** |
| * Decode amplitude information for each subband of a channel. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] ch_num channel to process |
| * @param[in] band_has_tones ptr to an array of per-band-flags: |
| * 1 - tone data present |
| */ |
| static void decode_tones_amplitude(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int ch_num, int band_has_tones[]) |
| { |
| int mode, sb, j, i, diff, maxdiff, fi, delta, pred; |
| Atrac3pWaveParam *wsrc, *wref; |
| int refwaves[48] = { 0 }; |
| Atrac3pWavesData *dst = ctx->channels[ch_num].tones_info; |
| Atrac3pWavesData *ref = ctx->channels[0].tones_info; |
| |
| if (ch_num) { |
| for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| if (!band_has_tones[sb] || !dst[sb].num_wavs) |
| continue; |
| wsrc = &ctx->waves_info->waves[dst[sb].start_index]; |
| wref = &ctx->waves_info->waves[ref[sb].start_index]; |
| for (j = 0; j < dst[sb].num_wavs; j++) { |
| for (i = 0, fi = 0, maxdiff = 1024; i < ref[sb].num_wavs; i++) { |
| diff = FFABS(wsrc[j].freq_index - wref[i].freq_index); |
| if (diff < maxdiff) { |
| maxdiff = diff; |
| fi = i; |
| } |
| } |
| |
| if (maxdiff < 8) |
| refwaves[dst[sb].start_index + j] = fi + ref[sb].start_index; |
| else if (j < ref[sb].num_wavs) |
| refwaves[dst[sb].start_index + j] = j + ref[sb].start_index; |
| else |
| refwaves[dst[sb].start_index + j] = -1; |
| } |
| } |
| } |
| |
| mode = get_bits(gb, ch_num + 1); |
| |
| switch (mode) { |
| case 0: /** fixed-length coding */ |
| for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| if (!band_has_tones[sb] || !dst[sb].num_wavs) |
| continue; |
| if (ctx->waves_info->amplitude_mode) |
| for (i = 0; i < dst[sb].num_wavs; i++) |
| ctx->waves_info->waves[dst[sb].start_index + i].amp_sf = get_bits(gb, 6); |
| else |
| ctx->waves_info->waves[dst[sb].start_index].amp_sf = get_bits(gb, 6); |
| } |
| break; |
| case 1: /** min + VLC delta */ |
| for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| if (!band_has_tones[sb] || !dst[sb].num_wavs) |
| continue; |
| if (ctx->waves_info->amplitude_mode) |
| for (i = 0; i < dst[sb].num_wavs; i++) |
| ctx->waves_info->waves[dst[sb].start_index + i].amp_sf = |
| get_vlc2(gb, tone_vlc_tabs[3].table, |
| tone_vlc_tabs[3].bits, 1) + 20; |
| else |
| ctx->waves_info->waves[dst[sb].start_index].amp_sf = |
| get_vlc2(gb, tone_vlc_tabs[4].table, |
| tone_vlc_tabs[4].bits, 1) + 24; |
| } |
| break; |
| case 2: /** VLC modulo delta to master (slave only) */ |
| for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| if (!band_has_tones[sb] || !dst[sb].num_wavs) |
| continue; |
| for (i = 0; i < dst[sb].num_wavs; i++) { |
| delta = get_vlc2(gb, tone_vlc_tabs[5].table, |
| tone_vlc_tabs[5].bits, 1); |
| delta = sign_extend(delta, 5); |
| pred = refwaves[dst[sb].start_index + i] >= 0 ? |
| ctx->waves_info->waves[refwaves[dst[sb].start_index + i]].amp_sf : 34; |
| ctx->waves_info->waves[dst[sb].start_index + i].amp_sf = (pred + delta) & 0x3F; |
| } |
| } |
| break; |
| case 3: /** clone master (slave only) */ |
| for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| if (!band_has_tones[sb]) |
| continue; |
| for (i = 0; i < dst[sb].num_wavs; i++) |
| ctx->waves_info->waves[dst[sb].start_index + i].amp_sf = |
| refwaves[dst[sb].start_index + i] >= 0 |
| ? ctx->waves_info->waves[refwaves[dst[sb].start_index + i]].amp_sf |
| : 32; |
| } |
| break; |
| } |
| } |
| |
| /** |
| * Decode phase information for each subband of a channel. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] ch_num channel to process |
| * @param[in] band_has_tones ptr to an array of per-band-flags: |
| * 1 - tone data present |
| */ |
| static void decode_tones_phase(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int ch_num, int band_has_tones[]) |
| { |
| int sb, i; |
| Atrac3pWaveParam *wparam; |
| Atrac3pWavesData *dst = ctx->channels[ch_num].tones_info; |
| |
| for (sb = 0; sb < ctx->waves_info->num_tone_bands; sb++) { |
| if (!band_has_tones[sb]) |
| continue; |
| wparam = &ctx->waves_info->waves[dst[sb].start_index]; |
| for (i = 0; i < dst[sb].num_wavs; i++) |
| wparam[i].phase_index = get_bits(gb, 5); |
| } |
| } |
| |
| /** |
| * Decode tones info for all channels. |
| * |
| * @param[in] gb the GetBit context |
| * @param[in,out] ctx ptr to the channel unit context |
| * @param[in] num_channels number of channels to process |
| * @param[in] avctx ptr to the AVCodecContext |
| * @return result code: 0 = OK, otherwise - error code |
| */ |
| static int decode_tones_info(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int num_channels, AVCodecContext *avctx) |
| { |
| int ch_num, i, ret; |
| int band_has_tones[16]; |
| |
| for (ch_num = 0; ch_num < num_channels; ch_num++) |
| memset(ctx->channels[ch_num].tones_info, 0, |
| sizeof(*ctx->channels[ch_num].tones_info) * ATRAC3P_SUBBANDS); |
| |
| ctx->waves_info->tones_present = get_bits1(gb); |
| if (!ctx->waves_info->tones_present) |
| return 0; |
| |
| memset(ctx->waves_info->waves, 0, sizeof(ctx->waves_info->waves)); |
| |
| ctx->waves_info->amplitude_mode = get_bits1(gb); |
| if (!ctx->waves_info->amplitude_mode) { |
| avpriv_report_missing_feature(avctx, "GHA amplitude mode 0"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| ctx->waves_info->num_tone_bands = |
| get_vlc2(gb, tone_vlc_tabs[0].table, |
| tone_vlc_tabs[0].bits, 1) + 1; |
| |
| if (num_channels == 2) { |
| get_subband_flags(gb, ctx->waves_info->tone_sharing, ctx->waves_info->num_tone_bands); |
| get_subband_flags(gb, ctx->waves_info->tone_master, ctx->waves_info->num_tone_bands); |
| get_subband_flags(gb, ctx->waves_info->invert_phase, ctx->waves_info->num_tone_bands); |
| } |
| |
| ctx->waves_info->tones_index = 0; |
| |
| for (ch_num = 0; ch_num < num_channels; ch_num++) { |
| for (i = 0; i < ctx->waves_info->num_tone_bands; i++) |
| band_has_tones[i] = !ch_num ? 1 : !ctx->waves_info->tone_sharing[i]; |
| |
| decode_tones_envelope(gb, ctx, ch_num, band_has_tones); |
| if ((ret = decode_band_numwavs(gb, ctx, ch_num, band_has_tones, |
| avctx)) < 0) |
| return ret; |
| |
| decode_tones_frequency(gb, ctx, ch_num, band_has_tones); |
| decode_tones_amplitude(gb, ctx, ch_num, band_has_tones); |
| decode_tones_phase(gb, ctx, ch_num, band_has_tones); |
| } |
| |
| if (num_channels == 2) { |
| for (i = 0; i < ctx->waves_info->num_tone_bands; i++) { |
| if (ctx->waves_info->tone_sharing[i]) |
| ctx->channels[1].tones_info[i] = ctx->channels[0].tones_info[i]; |
| |
| if (ctx->waves_info->tone_master[i]) |
| FFSWAP(Atrac3pWavesData, ctx->channels[0].tones_info[i], |
| ctx->channels[1].tones_info[i]); |
| } |
| } |
| |
| return 0; |
| } |
| |
| int ff_atrac3p_decode_channel_unit(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, |
| int num_channels, AVCodecContext *avctx) |
| { |
| int ret; |
| |
| /* parse sound header */ |
| ctx->num_quant_units = get_bits(gb, 5) + 1; |
| if (ctx->num_quant_units > 28 && ctx->num_quant_units < 32) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Invalid number of quantization units: %d!\n", |
| ctx->num_quant_units); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| ctx->mute_flag = get_bits1(gb); |
| |
| /* decode various sound parameters */ |
| if ((ret = decode_quant_wordlen(gb, ctx, num_channels, avctx)) < 0) |
| return ret; |
| |
| ctx->num_subbands = atrac3p_qu_to_subband[ctx->num_quant_units - 1] + 1; |
| ctx->num_coded_subbands = ctx->used_quant_units |
| ? atrac3p_qu_to_subband[ctx->used_quant_units - 1] + 1 |
| : 0; |
| |
| if ((ret = decode_scale_factors(gb, ctx, num_channels, avctx)) < 0) |
| return ret; |
| |
| if ((ret = decode_code_table_indexes(gb, ctx, num_channels, avctx)) < 0) |
| return ret; |
| |
| decode_spectrum(gb, ctx, num_channels, avctx); |
| |
| if (num_channels == 2) { |
| get_subband_flags(gb, ctx->swap_channels, ctx->num_coded_subbands); |
| get_subband_flags(gb, ctx->negate_coeffs, ctx->num_coded_subbands); |
| } |
| |
| decode_window_shape(gb, ctx, num_channels); |
| |
| if ((ret = decode_gainc_data(gb, ctx, num_channels, avctx)) < 0) |
| return ret; |
| |
| if ((ret = decode_tones_info(gb, ctx, num_channels, avctx)) < 0) |
| return ret; |
| |
| /* decode global noise info */ |
| ctx->noise_present = get_bits1(gb); |
| if (ctx->noise_present) { |
| ctx->noise_level_index = get_bits(gb, 4); |
| ctx->noise_table_index = get_bits(gb, 4); |
| } |
| |
| return 0; |
| } |
