2 * Functions common to fixed/float MPEG-4 Parametric Stereo decoding
3 * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "libavutil/common.h"
24 #include "libavutil/thread.h"
27 #include "aacpsdata.c"
29 static const int8_t num_env_tab[2][4] = {
34 static const int8_t nr_iidicc_par_tab[] = {
35 10, 20, 34, 10, 20, 34,
38 static const int8_t nr_iidopd_par_tab[] = {
55 static const int huff_iid[] = {
62 static VLC vlc_ps[10];
64 #define READ_PAR_DATA(PAR, OFFSET, MASK, ERR_CONDITION, NB_BITS, MAX_DEPTH) \
66 * Read Inter-channel Intensity Difference/Inter-Channel Coherence/ \
67 * Inter-channel Phase Difference/Overall Phase Difference parameters from the \
70 * @param avctx contains the current codec context \
71 * @param gb pointer to the input bitstream \
72 * @param ps pointer to the Parametric Stereo context \
73 * @param PAR pointer to the parameter to be read \
74 * @param e envelope to decode \
75 * @param dt 1: time delta-coded, 0: frequency delta-coded \
77 static int read_ ## PAR ## _data(AVCodecContext *avctx, GetBitContext *gb, PSCommonContext *ps, \
78 int8_t (*PAR)[PS_MAX_NR_IIDICC], int table_idx, int e, int dt) \
80 int b, num = ps->nr_ ## PAR ## _par; \
81 VLC_TYPE (*vlc_table)[2] = vlc_ps[table_idx].table; \
83 int e_prev = e ? e - 1 : ps->num_env_old - 1; \
84 e_prev = FFMAX(e_prev, 0); \
85 for (b = 0; b < num; b++) { \
86 int val = PAR[e_prev][b] + get_vlc2(gb, vlc_table, NB_BITS, MAX_DEPTH) - OFFSET; \
87 if (MASK) val &= MASK; \
94 for (b = 0; b < num; b++) { \
95 val += get_vlc2(gb, vlc_table, NB_BITS, MAX_DEPTH) - OFFSET; \
96 if (MASK) val &= MASK; \
104 av_log(avctx, AV_LOG_ERROR, "illegal "#PAR"\n"); \
105 return AVERROR_INVALIDDATA; \
108 READ_PAR_DATA(iid, huff_offset[table_idx], 0, FFABS(ps->iid_par[e][b]) > 7 + 8 * ps->iid_quant, 9, 3)
109 READ_PAR_DATA(icc, huff_offset[table_idx], 0, ps->icc_par[e][b] > 7U, 9, 2)
110 READ_PAR_DATA(ipdopd, 0, 0x07, 0, 5, 1)
112 static int ps_read_extension_data(GetBitContext *gb, PSCommonContext *ps,
116 int count = get_bits_count(gb);
121 ps->enable_ipdopd = get_bits1(gb);
122 if (ps->enable_ipdopd) {
123 for (e = 0; e < ps->num_env; e++) {
124 int dt = get_bits1(gb);
125 read_ipdopd_data(NULL, gb, ps, ps->ipd_par, dt ? huff_ipd_dt : huff_ipd_df, e, dt);
127 read_ipdopd_data(NULL, gb, ps, ps->opd_par, dt ? huff_opd_dt : huff_opd_df, e, dt);
130 skip_bits1(gb); //reserved_ps
131 return get_bits_count(gb) - count;
134 int ff_ps_read_data(AVCodecContext *avctx, GetBitContext *gb_host,
135 PSCommonContext *ps, int bits_left)
138 int bit_count_start = get_bits_count(gb_host);
141 GetBitContext gbc = *gb_host, *gb = &gbc;
143 header = get_bits1(gb);
144 if (header) { //enable_ps_header
145 ps->enable_iid = get_bits1(gb);
146 if (ps->enable_iid) {
147 int iid_mode = get_bits(gb, 3);
149 av_log(avctx, AV_LOG_ERROR, "iid_mode %d is reserved.\n",
153 ps->nr_iid_par = nr_iidicc_par_tab[iid_mode];
154 ps->iid_quant = iid_mode > 2;
155 ps->nr_ipdopd_par = nr_iidopd_par_tab[iid_mode];
157 ps->enable_icc = get_bits1(gb);
158 if (ps->enable_icc) {
159 ps->icc_mode = get_bits(gb, 3);
160 if (ps->icc_mode > 5) {
161 av_log(avctx, AV_LOG_ERROR, "icc_mode %d is reserved.\n",
165 ps->nr_icc_par = nr_iidicc_par_tab[ps->icc_mode];
167 ps->enable_ext = get_bits1(gb);
170 ps->frame_class = get_bits1(gb);
171 ps->num_env_old = ps->num_env;
172 ps->num_env = num_env_tab[ps->frame_class][get_bits(gb, 2)];
174 ps->border_position[0] = -1;
175 if (ps->frame_class) {
176 for (e = 1; e <= ps->num_env; e++) {
177 ps->border_position[e] = get_bits(gb, 5);
178 if (ps->border_position[e] < ps->border_position[e-1]) {
179 av_log(avctx, AV_LOG_ERROR, "border_position non monotone.\n");
184 for (e = 1; e <= ps->num_env; e++)
185 ps->border_position[e] = (e * numQMFSlots >> ff_log2_tab[ps->num_env]) - 1;
187 if (ps->enable_iid) {
188 for (e = 0; e < ps->num_env; e++) {
189 int dt = get_bits1(gb);
190 if (read_iid_data(avctx, gb, ps, ps->iid_par, huff_iid[2*dt+ps->iid_quant], e, dt))
194 memset(ps->iid_par, 0, sizeof(ps->iid_par));
197 for (e = 0; e < ps->num_env; e++) {
198 int dt = get_bits1(gb);
199 if (read_icc_data(avctx, gb, ps, ps->icc_par, dt ? huff_icc_dt : huff_icc_df, e, dt))
203 memset(ps->icc_par, 0, sizeof(ps->icc_par));
205 if (ps->enable_ext) {
206 int cnt = get_bits(gb, 4);
208 cnt += get_bits(gb, 8);
212 int ps_extension_id = get_bits(gb, 2);
213 cnt -= 2 + ps_read_extension_data(gb, ps, ps_extension_id);
216 av_log(avctx, AV_LOG_ERROR, "ps extension overflow %d\n", cnt);
222 ps->enable_ipdopd &= !PS_BASELINE;
225 if (!ps->num_env || ps->border_position[ps->num_env] < numQMFSlots - 1) {
226 //Create a fake envelope
227 int source = ps->num_env ? ps->num_env - 1 : ps->num_env_old - 1;
229 if (source >= 0 && source != ps->num_env) {
230 if (ps->enable_iid) {
231 memcpy(ps->iid_par+ps->num_env, ps->iid_par+source, sizeof(ps->iid_par[0]));
233 if (ps->enable_icc) {
234 memcpy(ps->icc_par+ps->num_env, ps->icc_par+source, sizeof(ps->icc_par[0]));
236 if (ps->enable_ipdopd) {
237 memcpy(ps->ipd_par+ps->num_env, ps->ipd_par+source, sizeof(ps->ipd_par[0]));
238 memcpy(ps->opd_par+ps->num_env, ps->opd_par+source, sizeof(ps->opd_par[0]));
242 for (b = 0; b < ps->nr_iid_par; b++) {
243 if (FFABS(ps->iid_par[ps->num_env][b]) > 7 + 8 * ps->iid_quant) {
244 av_log(avctx, AV_LOG_ERROR, "iid_par invalid\n");
250 for (b = 0; b < ps->nr_iid_par; b++) {
251 if (ps->icc_par[ps->num_env][b] > 7U) {
252 av_log(avctx, AV_LOG_ERROR, "icc_par invalid\n");
258 ps->border_position[ps->num_env] = numQMFSlots - 1;
262 ps->is34bands_old = ps->is34bands;
263 if (!PS_BASELINE && (ps->enable_iid || ps->enable_icc))
264 ps->is34bands = (ps->enable_iid && ps->nr_iid_par == 34) ||
265 (ps->enable_icc && ps->nr_icc_par == 34);
268 if (!ps->enable_ipdopd) {
269 memset(ps->ipd_par, 0, sizeof(ps->ipd_par));
270 memset(ps->opd_par, 0, sizeof(ps->opd_par));
276 bits_consumed = get_bits_count(gb) - bit_count_start;
277 if (bits_consumed <= bits_left) {
278 skip_bits_long(gb_host, bits_consumed);
279 return bits_consumed;
281 av_log(avctx, AV_LOG_ERROR, "Expected to read %d PS bits actually read %d.\n", bits_left, bits_consumed);
284 skip_bits_long(gb_host, bits_left);
285 memset(ps->iid_par, 0, sizeof(ps->iid_par));
286 memset(ps->icc_par, 0, sizeof(ps->icc_par));
287 memset(ps->ipd_par, 0, sizeof(ps->ipd_par));
288 memset(ps->opd_par, 0, sizeof(ps->opd_par));
292 #define PS_INIT_VLC_STATIC(num, nb_bits, size) \
293 INIT_VLC_STATIC(&vlc_ps[num], nb_bits, ps_tmp[num].table_size / ps_tmp[num].elem_size, \
294 ps_tmp[num].ps_bits, 1, 1, \
295 ps_tmp[num].ps_codes, ps_tmp[num].elem_size, ps_tmp[num].elem_size, \
298 #define PS_VLC_ROW(name) \
299 { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
301 static av_cold void ps_init_common(void)
303 // Syntax initialization
304 static const struct {
305 const void *ps_codes, *ps_bits;
306 const unsigned int table_size, elem_size;
308 PS_VLC_ROW(huff_iid_df1),
309 PS_VLC_ROW(huff_iid_dt1),
310 PS_VLC_ROW(huff_iid_df0),
311 PS_VLC_ROW(huff_iid_dt0),
312 PS_VLC_ROW(huff_icc_df),
313 PS_VLC_ROW(huff_icc_dt),
314 PS_VLC_ROW(huff_ipd_df),
315 PS_VLC_ROW(huff_ipd_dt),
316 PS_VLC_ROW(huff_opd_df),
317 PS_VLC_ROW(huff_opd_dt),
320 PS_INIT_VLC_STATIC(0, 9, 1544);
321 PS_INIT_VLC_STATIC(1, 9, 832);
322 PS_INIT_VLC_STATIC(2, 9, 1024);
323 PS_INIT_VLC_STATIC(3, 9, 1036);
324 PS_INIT_VLC_STATIC(4, 9, 544);
325 PS_INIT_VLC_STATIC(5, 9, 544);
326 PS_INIT_VLC_STATIC(6, 5, 32);
327 PS_INIT_VLC_STATIC(7, 5, 32);
328 PS_INIT_VLC_STATIC(8, 5, 32);
329 PS_INIT_VLC_STATIC(9, 5, 32);
332 av_cold void ff_ps_init_common(void)
334 static AVOnce init_static_once = AV_ONCE_INIT;
335 ff_thread_once(&init_static_once, ps_init_common);