| /* | |
| * 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 VLCElem tables_data[154276]; | |
| 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,out] xlat ptr to ptr to translation table | |
| * @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, max_len; | |
| uint8_t bits[256]; | |
| int index = 0; | |
| for (int b = 1; b <= 12; b++) { | |
| for (i = *cb++; i > 0; i--) { | |
| av_assert0(index < 256); | |
| bits[index] = b; | |
| index++; | |
| } | |
| } | |
| max_len = bits[index - 1]; | |
| out_vlc->table = &tables_data[*tab_offset]; | |
| out_vlc->table_allocated = 1 << max_len; | |
| ff_vlc_init_from_lengths(out_vlc, max_len, index, bits, 1, | |
| *xlat, 1, 1, 0, VLC_INIT_USE_STATIC, NULL); | |
| *tab_offset += 1 << max_len; | |
| *xlat += index; | |
| } | |
| av_cold void ff_atrac3p_init_vlcs(void) | |
| { | |
| int i, tab_offset = 0; | |
| const uint8_t *xlats; | |
| xlats = atrac3p_wl_ct_xlats; | |
| for (int i = 0; i < 4; i++) { | |
| build_canonical_huff(atrac3p_wl_cbs[i], &xlats, | |
| &tab_offset, &wl_vlc_tabs[i]); | |
| build_canonical_huff(atrac3p_ct_cbs[i], &xlats, | |
| &tab_offset, &ct_vlc_tabs[i]); | |
| } | |
| xlats = atrac3p_sf_xlats; | |
| for (int i = 0; i < 8; i++) | |
| build_canonical_huff(atrac3p_sf_cbs[i], &xlats, | |
| &tab_offset, &sf_vlc_tabs[i]); | |
| /* build huffman tables for spectrum decoding */ | |
| xlats = atrac3p_spectra_xlats; | |
| for (i = 0; i < 112; i++) { | |
| if (atrac3p_spectra_cbs[i][0] >= 0) | |
| build_canonical_huff(atrac3p_spectra_cbs[i], | |
| &xlats, &tab_offset, &spec_vlc_tabs[i]); | |
| else /* Reuse already initialized VLC table */ | |
| spec_vlc_tabs[i] = spec_vlc_tabs[-atrac3p_spectra_cbs[i][0]]; | |
| } | |
| /* build huffman tables for gain data decoding */ | |
| xlats = atrac3p_gain_xlats; | |
| for (i = 0; i < 11; i++) | |
| build_canonical_huff(atrac3p_gain_cbs[i], &xlats, | |
| &tab_offset, &gain_vlc_tabs[i]); | |
| /* build huffman tables for tone decoding */ | |
| xlats = atrac3p_tone_xlats; | |
| for (i = 0; i < 7; i++) | |
| build_canonical_huff(atrac3p_tone_cbs[i], &xlats, | |
| &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; | |
| if (pos > FF_ARRAY_ELEMS(chan->qu_wordlen)) { | |
| av_log(avctx, AV_LOG_ERROR, "Split point beyond array\n"); | |
| pos = FF_ARRAY_ELEMS(chan->qu_wordlen); | |
| } | |
| 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]; | |
| 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: %"PRId64"!\n", | |
| ctx->waves_info->tones_index + dst[sb].num_wavs, | |
| avctx->frame_num); | |
| 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; | |
| } |