mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
2d764069be
In C, qualifiers for arrays are broken: const VLC_TYPE (*foo)[2] is a pointer to an array of two const VLC_TYPE elements and unfortunately this is not compatible with a pointer to a const array of two VLC_TYPE, because the latter does not exist as array types are never qualified (the qualifier applies to the base type instead). This is the reason why get_vlc2() doesn't accept a const VLC table despite not modifying the table at all, as there is no automatic conversion from VLC_TYPE (*)[2] to const VLC_TYPE (*)[2]. Fix this by using a structure VLCElem for the VLC table. This also has the advantage of making it clear which element is which. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
337 lines
11 KiB
C
337 lines
11 KiB
C
/*
|
|
* Functions common to fixed/float MPEG-4 Parametric Stereo decoding
|
|
* Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include "libavutil/common.h"
|
|
#include "libavutil/thread.h"
|
|
#include "aacps.h"
|
|
#include "get_bits.h"
|
|
#include "aacpsdata.c"
|
|
|
|
static const int8_t num_env_tab[2][4] = {
|
|
{ 0, 1, 2, 4, },
|
|
{ 1, 2, 3, 4, },
|
|
};
|
|
|
|
static const int8_t nr_iidicc_par_tab[] = {
|
|
10, 20, 34, 10, 20, 34,
|
|
};
|
|
|
|
static const int8_t nr_iidopd_par_tab[] = {
|
|
5, 11, 17, 5, 11, 17,
|
|
};
|
|
|
|
enum {
|
|
huff_iid_df1,
|
|
huff_iid_dt1,
|
|
huff_iid_df0,
|
|
huff_iid_dt0,
|
|
huff_icc_df,
|
|
huff_icc_dt,
|
|
huff_ipd_df,
|
|
huff_ipd_dt,
|
|
huff_opd_df,
|
|
huff_opd_dt,
|
|
};
|
|
|
|
static const int huff_iid[] = {
|
|
huff_iid_df0,
|
|
huff_iid_df1,
|
|
huff_iid_dt0,
|
|
huff_iid_dt1,
|
|
};
|
|
|
|
static VLC vlc_ps[10];
|
|
|
|
#define READ_PAR_DATA(PAR, OFFSET, MASK, ERR_CONDITION, NB_BITS, MAX_DEPTH) \
|
|
/** \
|
|
* Read Inter-channel Intensity Difference/Inter-Channel Coherence/ \
|
|
* Inter-channel Phase Difference/Overall Phase Difference parameters from the \
|
|
* bitstream. \
|
|
* \
|
|
* @param avctx contains the current codec context \
|
|
* @param gb pointer to the input bitstream \
|
|
* @param ps pointer to the Parametric Stereo context \
|
|
* @param PAR pointer to the parameter to be read \
|
|
* @param e envelope to decode \
|
|
* @param dt 1: time delta-coded, 0: frequency delta-coded \
|
|
*/ \
|
|
static int read_ ## PAR ## _data(AVCodecContext *avctx, GetBitContext *gb, PSCommonContext *ps, \
|
|
int8_t (*PAR)[PS_MAX_NR_IIDICC], int table_idx, int e, int dt) \
|
|
{ \
|
|
int b, num = ps->nr_ ## PAR ## _par; \
|
|
const VLCElem *vlc_table = vlc_ps[table_idx].table; \
|
|
if (dt) { \
|
|
int e_prev = e ? e - 1 : ps->num_env_old - 1; \
|
|
e_prev = FFMAX(e_prev, 0); \
|
|
for (b = 0; b < num; b++) { \
|
|
int val = PAR[e_prev][b] + get_vlc2(gb, vlc_table, NB_BITS, MAX_DEPTH) - OFFSET; \
|
|
if (MASK) val &= MASK; \
|
|
PAR[e][b] = val; \
|
|
if (ERR_CONDITION) \
|
|
goto err; \
|
|
} \
|
|
} else { \
|
|
int val = 0; \
|
|
for (b = 0; b < num; b++) { \
|
|
val += get_vlc2(gb, vlc_table, NB_BITS, MAX_DEPTH) - OFFSET; \
|
|
if (MASK) val &= MASK; \
|
|
PAR[e][b] = val; \
|
|
if (ERR_CONDITION) \
|
|
goto err; \
|
|
} \
|
|
} \
|
|
return 0; \
|
|
err: \
|
|
av_log(avctx, AV_LOG_ERROR, "illegal "#PAR"\n"); \
|
|
return AVERROR_INVALIDDATA; \
|
|
}
|
|
|
|
READ_PAR_DATA(iid, huff_offset[table_idx], 0, FFABS(ps->iid_par[e][b]) > 7 + 8 * ps->iid_quant, 9, 3)
|
|
READ_PAR_DATA(icc, huff_offset[table_idx], 0, ps->icc_par[e][b] > 7U, 9, 2)
|
|
READ_PAR_DATA(ipdopd, 0, 0x07, 0, 5, 1)
|
|
|
|
static int ps_read_extension_data(GetBitContext *gb, PSCommonContext *ps,
|
|
int ps_extension_id)
|
|
{
|
|
int e;
|
|
int count = get_bits_count(gb);
|
|
|
|
if (ps_extension_id)
|
|
return 0;
|
|
|
|
ps->enable_ipdopd = get_bits1(gb);
|
|
if (ps->enable_ipdopd) {
|
|
for (e = 0; e < ps->num_env; e++) {
|
|
int dt = get_bits1(gb);
|
|
read_ipdopd_data(NULL, gb, ps, ps->ipd_par, dt ? huff_ipd_dt : huff_ipd_df, e, dt);
|
|
dt = get_bits1(gb);
|
|
read_ipdopd_data(NULL, gb, ps, ps->opd_par, dt ? huff_opd_dt : huff_opd_df, e, dt);
|
|
}
|
|
}
|
|
skip_bits1(gb); //reserved_ps
|
|
return get_bits_count(gb) - count;
|
|
}
|
|
|
|
int ff_ps_read_data(AVCodecContext *avctx, GetBitContext *gb_host,
|
|
PSCommonContext *ps, int bits_left)
|
|
{
|
|
int e;
|
|
int bit_count_start = get_bits_count(gb_host);
|
|
int header;
|
|
int bits_consumed;
|
|
GetBitContext gbc = *gb_host, *gb = &gbc;
|
|
|
|
header = get_bits1(gb);
|
|
if (header) { //enable_ps_header
|
|
ps->enable_iid = get_bits1(gb);
|
|
if (ps->enable_iid) {
|
|
int iid_mode = get_bits(gb, 3);
|
|
if (iid_mode > 5) {
|
|
av_log(avctx, AV_LOG_ERROR, "iid_mode %d is reserved.\n",
|
|
iid_mode);
|
|
goto err;
|
|
}
|
|
ps->nr_iid_par = nr_iidicc_par_tab[iid_mode];
|
|
ps->iid_quant = iid_mode > 2;
|
|
ps->nr_ipdopd_par = nr_iidopd_par_tab[iid_mode];
|
|
}
|
|
ps->enable_icc = get_bits1(gb);
|
|
if (ps->enable_icc) {
|
|
ps->icc_mode = get_bits(gb, 3);
|
|
if (ps->icc_mode > 5) {
|
|
av_log(avctx, AV_LOG_ERROR, "icc_mode %d is reserved.\n",
|
|
ps->icc_mode);
|
|
goto err;
|
|
}
|
|
ps->nr_icc_par = nr_iidicc_par_tab[ps->icc_mode];
|
|
}
|
|
ps->enable_ext = get_bits1(gb);
|
|
}
|
|
|
|
ps->frame_class = get_bits1(gb);
|
|
ps->num_env_old = ps->num_env;
|
|
ps->num_env = num_env_tab[ps->frame_class][get_bits(gb, 2)];
|
|
|
|
ps->border_position[0] = -1;
|
|
if (ps->frame_class) {
|
|
for (e = 1; e <= ps->num_env; e++) {
|
|
ps->border_position[e] = get_bits(gb, 5);
|
|
if (ps->border_position[e] < ps->border_position[e-1]) {
|
|
av_log(avctx, AV_LOG_ERROR, "border_position non monotone.\n");
|
|
goto err;
|
|
}
|
|
}
|
|
} else
|
|
for (e = 1; e <= ps->num_env; e++)
|
|
ps->border_position[e] = (e * numQMFSlots >> ff_log2_tab[ps->num_env]) - 1;
|
|
|
|
if (ps->enable_iid) {
|
|
for (e = 0; e < ps->num_env; e++) {
|
|
int dt = get_bits1(gb);
|
|
if (read_iid_data(avctx, gb, ps, ps->iid_par, huff_iid[2*dt+ps->iid_quant], e, dt))
|
|
goto err;
|
|
}
|
|
} else
|
|
memset(ps->iid_par, 0, sizeof(ps->iid_par));
|
|
|
|
if (ps->enable_icc)
|
|
for (e = 0; e < ps->num_env; e++) {
|
|
int dt = get_bits1(gb);
|
|
if (read_icc_data(avctx, gb, ps, ps->icc_par, dt ? huff_icc_dt : huff_icc_df, e, dt))
|
|
goto err;
|
|
}
|
|
else
|
|
memset(ps->icc_par, 0, sizeof(ps->icc_par));
|
|
|
|
if (ps->enable_ext) {
|
|
int cnt = get_bits(gb, 4);
|
|
if (cnt == 15) {
|
|
cnt += get_bits(gb, 8);
|
|
}
|
|
cnt *= 8;
|
|
while (cnt > 7) {
|
|
int ps_extension_id = get_bits(gb, 2);
|
|
cnt -= 2 + ps_read_extension_data(gb, ps, ps_extension_id);
|
|
}
|
|
if (cnt < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "ps extension overflow %d\n", cnt);
|
|
goto err;
|
|
}
|
|
skip_bits(gb, cnt);
|
|
}
|
|
|
|
ps->enable_ipdopd &= !PS_BASELINE;
|
|
|
|
//Fix up envelopes
|
|
if (!ps->num_env || ps->border_position[ps->num_env] < numQMFSlots - 1) {
|
|
//Create a fake envelope
|
|
int source = ps->num_env ? ps->num_env - 1 : ps->num_env_old - 1;
|
|
int b;
|
|
if (source >= 0 && source != ps->num_env) {
|
|
if (ps->enable_iid) {
|
|
memcpy(ps->iid_par+ps->num_env, ps->iid_par+source, sizeof(ps->iid_par[0]));
|
|
}
|
|
if (ps->enable_icc) {
|
|
memcpy(ps->icc_par+ps->num_env, ps->icc_par+source, sizeof(ps->icc_par[0]));
|
|
}
|
|
if (ps->enable_ipdopd) {
|
|
memcpy(ps->ipd_par+ps->num_env, ps->ipd_par+source, sizeof(ps->ipd_par[0]));
|
|
memcpy(ps->opd_par+ps->num_env, ps->opd_par+source, sizeof(ps->opd_par[0]));
|
|
}
|
|
}
|
|
if (ps->enable_iid){
|
|
for (b = 0; b < ps->nr_iid_par; b++) {
|
|
if (FFABS(ps->iid_par[ps->num_env][b]) > 7 + 8 * ps->iid_quant) {
|
|
av_log(avctx, AV_LOG_ERROR, "iid_par invalid\n");
|
|
goto err;
|
|
}
|
|
}
|
|
}
|
|
if (ps->enable_icc){
|
|
for (b = 0; b < ps->nr_iid_par; b++) {
|
|
if (ps->icc_par[ps->num_env][b] > 7U) {
|
|
av_log(avctx, AV_LOG_ERROR, "icc_par invalid\n");
|
|
goto err;
|
|
}
|
|
}
|
|
}
|
|
ps->num_env++;
|
|
ps->border_position[ps->num_env] = numQMFSlots - 1;
|
|
}
|
|
|
|
|
|
ps->is34bands_old = ps->is34bands;
|
|
if (!PS_BASELINE && (ps->enable_iid || ps->enable_icc))
|
|
ps->is34bands = (ps->enable_iid && ps->nr_iid_par == 34) ||
|
|
(ps->enable_icc && ps->nr_icc_par == 34);
|
|
|
|
//Baseline
|
|
if (!ps->enable_ipdopd) {
|
|
memset(ps->ipd_par, 0, sizeof(ps->ipd_par));
|
|
memset(ps->opd_par, 0, sizeof(ps->opd_par));
|
|
}
|
|
|
|
if (header)
|
|
ps->start = 1;
|
|
|
|
bits_consumed = get_bits_count(gb) - bit_count_start;
|
|
if (bits_consumed <= bits_left) {
|
|
skip_bits_long(gb_host, bits_consumed);
|
|
return bits_consumed;
|
|
}
|
|
av_log(avctx, AV_LOG_ERROR, "Expected to read %d PS bits actually read %d.\n", bits_left, bits_consumed);
|
|
err:
|
|
ps->start = 0;
|
|
skip_bits_long(gb_host, bits_left);
|
|
memset(ps->iid_par, 0, sizeof(ps->iid_par));
|
|
memset(ps->icc_par, 0, sizeof(ps->icc_par));
|
|
memset(ps->ipd_par, 0, sizeof(ps->ipd_par));
|
|
memset(ps->opd_par, 0, sizeof(ps->opd_par));
|
|
return bits_left;
|
|
}
|
|
|
|
#define PS_INIT_VLC_STATIC(num, nb_bits, size) \
|
|
INIT_VLC_STATIC(&vlc_ps[num], nb_bits, ps_tmp[num].table_size / ps_tmp[num].elem_size, \
|
|
ps_tmp[num].ps_bits, 1, 1, \
|
|
ps_tmp[num].ps_codes, ps_tmp[num].elem_size, ps_tmp[num].elem_size, \
|
|
size);
|
|
|
|
#define PS_VLC_ROW(name) \
|
|
{ name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
|
|
|
|
static av_cold void ps_init_common(void)
|
|
{
|
|
// Syntax initialization
|
|
static const struct {
|
|
const void *ps_codes, *ps_bits;
|
|
const unsigned int table_size, elem_size;
|
|
} ps_tmp[] = {
|
|
PS_VLC_ROW(huff_iid_df1),
|
|
PS_VLC_ROW(huff_iid_dt1),
|
|
PS_VLC_ROW(huff_iid_df0),
|
|
PS_VLC_ROW(huff_iid_dt0),
|
|
PS_VLC_ROW(huff_icc_df),
|
|
PS_VLC_ROW(huff_icc_dt),
|
|
PS_VLC_ROW(huff_ipd_df),
|
|
PS_VLC_ROW(huff_ipd_dt),
|
|
PS_VLC_ROW(huff_opd_df),
|
|
PS_VLC_ROW(huff_opd_dt),
|
|
};
|
|
|
|
PS_INIT_VLC_STATIC(0, 9, 1544);
|
|
PS_INIT_VLC_STATIC(1, 9, 832);
|
|
PS_INIT_VLC_STATIC(2, 9, 1024);
|
|
PS_INIT_VLC_STATIC(3, 9, 1036);
|
|
PS_INIT_VLC_STATIC(4, 9, 544);
|
|
PS_INIT_VLC_STATIC(5, 9, 544);
|
|
PS_INIT_VLC_STATIC(6, 5, 32);
|
|
PS_INIT_VLC_STATIC(7, 5, 32);
|
|
PS_INIT_VLC_STATIC(8, 5, 32);
|
|
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);
|
|
}
|