mirror of https://github.com/FFmpeg/FFmpeg.git
Saves about 7KiB. Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>pull/371/head
Andreas Rheinhardt
4 years ago
parent
0d61a1cfad
commit
3693e2fcee
6 changed files with 400 additions and 354 deletions
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/*
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* Functions common to fixed/float MPEG-4 Parametric Stereo decoding |
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* Copyright (c) 2010 Alex Converse <alex.converse@gmail.com> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <stdint.h> |
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#include "libavutil/common.h" |
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#include "libavutil/thread.h" |
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#include "aacps.h" |
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#include "get_bits.h" |
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#include "aacpsdata.c" |
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static const int8_t num_env_tab[2][4] = { |
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{ 0, 1, 2, 4, }, |
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{ 1, 2, 3, 4, }, |
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}; |
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static const int8_t nr_iidicc_par_tab[] = { |
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10, 20, 34, 10, 20, 34, |
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}; |
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static const int8_t nr_iidopd_par_tab[] = { |
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5, 11, 17, 5, 11, 17, |
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}; |
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enum { |
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huff_iid_df1, |
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huff_iid_dt1, |
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huff_iid_df0, |
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huff_iid_dt0, |
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huff_icc_df, |
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huff_icc_dt, |
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huff_ipd_df, |
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huff_ipd_dt, |
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huff_opd_df, |
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huff_opd_dt, |
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}; |
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static const int huff_iid[] = { |
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huff_iid_df0, |
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huff_iid_df1, |
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huff_iid_dt0, |
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huff_iid_dt1, |
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}; |
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static VLC vlc_ps[10]; |
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#define READ_PAR_DATA(PAR, OFFSET, MASK, ERR_CONDITION) \ |
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/** \
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* Read Inter-channel Intensity Difference/Inter-Channel Coherence/ \
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* Inter-channel Phase Difference/Overall Phase Difference parameters from the \
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* bitstream. \
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* \
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* @param avctx contains the current codec context \
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* @param gb pointer to the input bitstream \
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* @param ps pointer to the Parametric Stereo context \
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* @param PAR pointer to the parameter to be read \
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* @param e envelope to decode \
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* @param dt 1: time delta-coded, 0: frequency delta-coded \
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*/ \
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static int read_ ## PAR ## _data(AVCodecContext *avctx, GetBitContext *gb, PSCommonContext *ps, \
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int8_t (*PAR)[PS_MAX_NR_IIDICC], int table_idx, int e, int dt) \
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{ \
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int b, num = ps->nr_ ## PAR ## _par; \
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VLC_TYPE (*vlc_table)[2] = vlc_ps[table_idx].table; \
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if (dt) { \
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int e_prev = e ? e - 1 : ps->num_env_old - 1; \
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e_prev = FFMAX(e_prev, 0); \
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for (b = 0; b < num; b++) { \
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int val = PAR[e_prev][b] + get_vlc2(gb, vlc_table, 9, 3) - OFFSET; \
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if (MASK) val &= MASK; \
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PAR[e][b] = val; \
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if (ERR_CONDITION) \
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goto err; \
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} \
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} else { \
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int val = 0; \
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for (b = 0; b < num; b++) { \
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val += get_vlc2(gb, vlc_table, 9, 3) - OFFSET; \
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if (MASK) val &= MASK; \
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PAR[e][b] = val; \
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if (ERR_CONDITION) \
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goto err; \
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} \
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} \
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return 0; \
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err: \
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av_log(avctx, AV_LOG_ERROR, "illegal "#PAR"\n"); \
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return AVERROR_INVALIDDATA; \
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} |
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READ_PAR_DATA(iid, huff_offset[table_idx], 0, FFABS(ps->iid_par[e][b]) > 7 + 8 * ps->iid_quant) |
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READ_PAR_DATA(icc, huff_offset[table_idx], 0, ps->icc_par[e][b] > 7U) |
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READ_PAR_DATA(ipdopd, 0, 0x07, 0) |
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static int ps_read_extension_data(GetBitContext *gb, PSCommonContext *ps, |
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int ps_extension_id) |
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{ |
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int e; |
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int count = get_bits_count(gb); |
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if (ps_extension_id) |
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return 0; |
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ps->enable_ipdopd = get_bits1(gb); |
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if (ps->enable_ipdopd) { |
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for (e = 0; e < ps->num_env; e++) { |
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int dt = get_bits1(gb); |
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read_ipdopd_data(NULL, gb, ps, ps->ipd_par, dt ? huff_ipd_dt : huff_ipd_df, e, dt); |
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dt = get_bits1(gb); |
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read_ipdopd_data(NULL, gb, ps, ps->opd_par, dt ? huff_opd_dt : huff_opd_df, e, dt); |
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} |
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} |
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skip_bits1(gb); //reserved_ps
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return get_bits_count(gb) - count; |
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} |
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int ff_ps_read_data(AVCodecContext *avctx, GetBitContext *gb_host, |
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PSCommonContext *ps, int bits_left) |
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{ |
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int e; |
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int bit_count_start = get_bits_count(gb_host); |
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int header; |
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int bits_consumed; |
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GetBitContext gbc = *gb_host, *gb = &gbc; |
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header = get_bits1(gb); |
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if (header) { //enable_ps_header
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ps->enable_iid = get_bits1(gb); |
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if (ps->enable_iid) { |
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int iid_mode = get_bits(gb, 3); |
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if (iid_mode > 5) { |
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av_log(avctx, AV_LOG_ERROR, "iid_mode %d is reserved.\n", |
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iid_mode); |
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goto err; |
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} |
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ps->nr_iid_par = nr_iidicc_par_tab[iid_mode]; |
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ps->iid_quant = iid_mode > 2; |
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ps->nr_ipdopd_par = nr_iidopd_par_tab[iid_mode]; |
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} |
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ps->enable_icc = get_bits1(gb); |
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if (ps->enable_icc) { |
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ps->icc_mode = get_bits(gb, 3); |
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if (ps->icc_mode > 5) { |
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av_log(avctx, AV_LOG_ERROR, "icc_mode %d is reserved.\n", |
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ps->icc_mode); |
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goto err; |
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} |
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ps->nr_icc_par = nr_iidicc_par_tab[ps->icc_mode]; |
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} |
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ps->enable_ext = get_bits1(gb); |
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} |
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ps->frame_class = get_bits1(gb); |
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ps->num_env_old = ps->num_env; |
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ps->num_env = num_env_tab[ps->frame_class][get_bits(gb, 2)]; |
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ps->border_position[0] = -1; |
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if (ps->frame_class) { |
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for (e = 1; e <= ps->num_env; e++) { |
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ps->border_position[e] = get_bits(gb, 5); |
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if (ps->border_position[e] < ps->border_position[e-1]) { |
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av_log(avctx, AV_LOG_ERROR, "border_position non monotone.\n"); |
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goto err; |
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} |
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} |
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} else |
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for (e = 1; e <= ps->num_env; e++) |
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ps->border_position[e] = (e * numQMFSlots >> ff_log2_tab[ps->num_env]) - 1; |
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if (ps->enable_iid) { |
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for (e = 0; e < ps->num_env; e++) { |
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int dt = get_bits1(gb); |
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if (read_iid_data(avctx, gb, ps, ps->iid_par, huff_iid[2*dt+ps->iid_quant], e, dt)) |
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goto err; |
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} |
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} else |
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memset(ps->iid_par, 0, sizeof(ps->iid_par)); |
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if (ps->enable_icc) |
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for (e = 0; e < ps->num_env; e++) { |
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int dt = get_bits1(gb); |
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if (read_icc_data(avctx, gb, ps, ps->icc_par, dt ? huff_icc_dt : huff_icc_df, e, dt)) |
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goto err; |
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} |
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else |
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memset(ps->icc_par, 0, sizeof(ps->icc_par)); |
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if (ps->enable_ext) { |
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int cnt = get_bits(gb, 4); |
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if (cnt == 15) { |
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cnt += get_bits(gb, 8); |
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} |
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cnt *= 8; |
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while (cnt > 7) { |
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int ps_extension_id = get_bits(gb, 2); |
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cnt -= 2 + ps_read_extension_data(gb, ps, ps_extension_id); |
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} |
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if (cnt < 0) { |
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av_log(avctx, AV_LOG_ERROR, "ps extension overflow %d\n", cnt); |
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goto err; |
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} |
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skip_bits(gb, cnt); |
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} |
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ps->enable_ipdopd &= !PS_BASELINE; |
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//Fix up envelopes
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if (!ps->num_env || ps->border_position[ps->num_env] < numQMFSlots - 1) { |
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//Create a fake envelope
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int source = ps->num_env ? ps->num_env - 1 : ps->num_env_old - 1; |
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int b; |
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if (source >= 0 && source != ps->num_env) { |
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if (ps->enable_iid) { |
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memcpy(ps->iid_par+ps->num_env, ps->iid_par+source, sizeof(ps->iid_par[0])); |
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} |
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if (ps->enable_icc) { |
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memcpy(ps->icc_par+ps->num_env, ps->icc_par+source, sizeof(ps->icc_par[0])); |
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} |
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if (ps->enable_ipdopd) { |
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memcpy(ps->ipd_par+ps->num_env, ps->ipd_par+source, sizeof(ps->ipd_par[0])); |
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memcpy(ps->opd_par+ps->num_env, ps->opd_par+source, sizeof(ps->opd_par[0])); |
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} |
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} |
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if (ps->enable_iid){ |
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for (b = 0; b < ps->nr_iid_par; b++) { |
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if (FFABS(ps->iid_par[ps->num_env][b]) > 7 + 8 * ps->iid_quant) { |
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av_log(avctx, AV_LOG_ERROR, "iid_par invalid\n"); |
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goto err; |
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} |
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} |
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} |
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if (ps->enable_icc){ |
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for (b = 0; b < ps->nr_iid_par; b++) { |
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if (ps->icc_par[ps->num_env][b] > 7U) { |
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av_log(avctx, AV_LOG_ERROR, "icc_par invalid\n"); |
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goto err; |
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} |
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} |
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} |
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ps->num_env++; |
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ps->border_position[ps->num_env] = numQMFSlots - 1; |
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} |
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ps->is34bands_old = ps->is34bands; |
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if (!PS_BASELINE && (ps->enable_iid || ps->enable_icc)) |
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ps->is34bands = (ps->enable_iid && ps->nr_iid_par == 34) || |
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(ps->enable_icc && ps->nr_icc_par == 34); |
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//Baseline
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if (!ps->enable_ipdopd) { |
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memset(ps->ipd_par, 0, sizeof(ps->ipd_par)); |
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memset(ps->opd_par, 0, sizeof(ps->opd_par)); |
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} |
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if (header) |
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ps->start = 1; |
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bits_consumed = get_bits_count(gb) - bit_count_start; |
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if (bits_consumed <= bits_left) { |
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skip_bits_long(gb_host, bits_consumed); |
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return bits_consumed; |
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} |
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av_log(avctx, AV_LOG_ERROR, "Expected to read %d PS bits actually read %d.\n", bits_left, bits_consumed); |
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err: |
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ps->start = 0; |
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skip_bits_long(gb_host, bits_left); |
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memset(ps->iid_par, 0, sizeof(ps->iid_par)); |
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memset(ps->icc_par, 0, sizeof(ps->icc_par)); |
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memset(ps->ipd_par, 0, sizeof(ps->ipd_par)); |
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memset(ps->opd_par, 0, sizeof(ps->opd_par)); |
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return bits_left; |
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} |
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#define PS_INIT_VLC_STATIC(num, size) \ |
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INIT_VLC_STATIC(&vlc_ps[num], 9, ps_tmp[num].table_size / ps_tmp[num].elem_size, \
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ps_tmp[num].ps_bits, 1, 1, \
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ps_tmp[num].ps_codes, ps_tmp[num].elem_size, ps_tmp[num].elem_size, \
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size); |
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#define PS_VLC_ROW(name) \ |
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{ name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) } |
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static av_cold void ps_init_common(void) |
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{ |
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// Syntax initialization
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static const struct { |
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const void *ps_codes, *ps_bits; |
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const unsigned int table_size, elem_size; |
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} ps_tmp[] = { |
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PS_VLC_ROW(huff_iid_df1), |
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PS_VLC_ROW(huff_iid_dt1), |
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PS_VLC_ROW(huff_iid_df0), |
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PS_VLC_ROW(huff_iid_dt0), |
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PS_VLC_ROW(huff_icc_df), |
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PS_VLC_ROW(huff_icc_dt), |
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PS_VLC_ROW(huff_ipd_df), |
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PS_VLC_ROW(huff_ipd_dt), |
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PS_VLC_ROW(huff_opd_df), |
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PS_VLC_ROW(huff_opd_dt), |
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}; |
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PS_INIT_VLC_STATIC(0, 1544); |
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PS_INIT_VLC_STATIC(1, 832); |
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PS_INIT_VLC_STATIC(2, 1024); |
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PS_INIT_VLC_STATIC(3, 1036); |
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PS_INIT_VLC_STATIC(4, 544); |
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PS_INIT_VLC_STATIC(5, 544); |
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PS_INIT_VLC_STATIC(6, 512); |
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PS_INIT_VLC_STATIC(7, 512); |
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PS_INIT_VLC_STATIC(8, 512); |
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PS_INIT_VLC_STATIC(9, 512); |
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} |
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av_cold void ff_ps_init_common(void) |
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{ |
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static AVOnce init_static_once = AV_ONCE_INIT; |
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ff_thread_once(&init_static_once, ps_init_common); |
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} |
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