337 lines
11 KiB
C
337 lines
11 KiB
C
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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, NB_BITS, MAX_DEPTH) \
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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, NB_BITS, MAX_DEPTH) - 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, NB_BITS, MAX_DEPTH) - 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, 9, 3)
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READ_PAR_DATA(icc, huff_offset[table_idx], 0, ps->icc_par[e][b] > 7U, 9, 2)
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READ_PAR_DATA(ipdopd, 0, 0x07, 0, 5, 1)
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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, nb_bits, size) \
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INIT_VLC_STATIC(&vlc_ps[num], nb_bits, 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, 9, 1544);
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PS_INIT_VLC_STATIC(1, 9, 832);
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PS_INIT_VLC_STATIC(2, 9, 1024);
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PS_INIT_VLC_STATIC(3, 9, 1036);
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PS_INIT_VLC_STATIC(4, 9, 544);
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PS_INIT_VLC_STATIC(5, 9, 544);
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PS_INIT_VLC_STATIC(6, 5, 32);
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PS_INIT_VLC_STATIC(7, 5, 32);
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PS_INIT_VLC_STATIC(8, 5, 32);
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PS_INIT_VLC_STATIC(9, 5, 32);
|
||
|
|
}
|
||
|
|
|
||
|
|
av_cold void ff_ps_init_common(void)
|
||
|
|
{
|
||
|
|
static AVOnce init_static_once = AV_ONCE_INIT;
|
||
|
|
ff_thread_once(&init_static_once, ps_init_common);
|
||
|
|
}
|