lavc: Add DSS SP decoder

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

1 files changed, 780 insertions, 0 deletions

diff --git a/libavcodec/dss_sp.c b/libavcodec/dss_sp.c
new file mode 100644
index 0000000000..6fadcc685d
--- /dev/null
+++ b/libavcodec/dss_sp.c
@@ -0,0 +1,780 @@
+/*
+ * Digital Speech Standard - Standard Play mode (DSS SP) audio decoder.
+ * Copyright (C) 2014 Oleksij Rempel <linux@rempel-privat.de>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/channel_layout.h"
+#include "libavutil/common.h"
+#include "libavutil/mem.h"
+#include "libavutil/opt.h"
+
+#include "avcodec.h"
+#include "get_bits.h"
+#include "internal.h"
+
+#define SUBFRAMES 4
+#define PULSE_MAX 8
+
+#define DSS_SP_FRAME_SIZE        42
+#define DSS_SP_SAMPLE_COUNT     (66 * SUBFRAMES)
+#define DSS_SP_FORMULA(a, b, c) ((((a) << 15) + (b) * (c)) + 0x4000) >> 15
+
+typedef struct DssSpSubframe {
+    int16_t gain;
+    int32_t combined_pulse_pos;
+    int16_t pulse_pos[7];
+    int16_t pulse_val[7];
+} DssSpSubframe;
+
+typedef struct DssSpFrame {
+    int16_t filter_idx[14];
+    int16_t sf_adaptive_gain[SUBFRAMES];
+    int16_t pitch_lag[SUBFRAMES];
+    struct DssSpSubframe sf[SUBFRAMES];
+} DssSpFrame;
+
+typedef struct DssSpContext {
+    int32_t excitation[288 + 6];
+    int32_t history[187];
+    DssSpFrame fparam;
+    int32_t working_buffer[SUBFRAMES][72];
+    int32_t audio_buf[15];
+    int32_t err_buf1[15];
+    int32_t lpc_filter[14];
+    int32_t filter[15];
+    int32_t vector_buf[72];
+    int noise_state;
+    int32_t err_buf2[15];
+
+    int pulse_dec_mode;
+
+    DECLARE_ALIGNED(16, uint8_t, bits)[DSS_SP_FRAME_SIZE +
+                                       FF_INPUT_BUFFER_PADDING_SIZE];
+} DssSpContext;
+
+/*
+ * Used for the coding/decoding of the pulse positions for the MP-MLQ codebook.
+ */
+static const uint32_t dss_sp_combinatorial_table[PULSE_MAX][72] = {
+    {       0,         0,         0,          0,          0,          0,
+            0,         0,         0,          0,          0,          0,
+            0,         0,         0,          0,          0,          0,
+            0,         0,         0,          0,          0,          0,
+            0,         0,         0,          0,          0,          0,
+            0,         0,         0,          0,          0,          0,
+            0,         0,         0,          0,          0,          0,
+            0,         0,         0,          0,          0,          0,
+            0,         0,         0,          0,          0,          0,
+            0,         0,         0,          0,          0,          0,
+            0,         0,         0,          0,          0,          0,
+            0,         0,         0,          0,          0,          0 },
+    {       0,         1,         2,          3,          4,          5,
+            6,         7,         8,          9,         10,         11,
+           12,        13,        14,         15,         16,         17,
+           18,        19,        20,         21,         22,         23,
+           24,        25,        26,         27,         28,         29,
+           30,        31,        32,         33,         34,         35,
+           36,        37,        38,         39,         40,         41,
+           42,        43,        44,         45,         46,         47,
+           48,        49,        50,         51,         52,         53,
+           54,        55,        56,         57,         58,         59,
+           60,        61,        62,         63,         64,         65,
+           66,        67,        68,         69,         70,         71 },
+    {       0,         0,         1,          3,          6,         10,
+           15,        21,        28,         36,         45,         55,
+           66,        78,        91,        105,        120,        136,
+          153,       171,       190,        210,        231,        253,
+          276,       300,       325,        351,        378,        406,
+          435,       465,       496,        528,        561,        595,
+          630,       666,       703,        741,        780,        820,
+          861,       903,       946,        990,       1035,       1081,
+         1128,      1176,      1225,       1275,       1326,       1378,
+         1431,      1485,      1540,       1596,       1653,       1711,
+         1770,      1830,      1891,       1953,       2016,       2080,
+         2145,      2211,      2278,       2346,       2415,       2485 },
+    {       0,         0,         0,          1,          4,         10,
+           20,        35,        56,         84,        120,        165,
+          220,       286,       364,        455,        560,        680,
+          816,       969,      1140,       1330,       1540,       1771,
+         2024,      2300,      2600,       2925,       3276,       3654,
+         4060,      4495,      4960,       5456,       5984,       6545,
+         7140,      7770,      8436,       9139,       9880,      10660,
+        11480,     12341,     13244,      14190,      15180,      16215,
+        17296,     18424,     19600,      20825,      22100,      23426,
+        24804,     26235,     27720,      29260,      30856,      32509,
+        34220,     35990,     37820,      39711,      41664,      43680,
+        45760,     47905,     50116,      52394,      54740,      57155 },
+    {       0,         0,         0,          0,          1,          5,
+           15,        35,        70,        126,        210,        330,
+          495,       715,      1001,       1365,       1820,       2380,
+         3060,      3876,      4845,       5985,       7315,       8855,
+        10626,     12650,     14950,      17550,      20475,      23751,
+        27405,     31465,     35960,      40920,      46376,      52360,
+        58905,     66045,     73815,      82251,      91390,     101270,
+       111930,    123410,    135751,     148995,     163185,     178365,
+       194580,    211876,    230300,     249900,     270725,     292825,
+       316251,    341055,    367290,     395010,     424270,     455126,
+       487635,    521855,    557845,     595665,     635376,     677040,
+       720720,    766480,    814385,     864501,     916895,     971635 },
+    {       0,         0,         0,          0,          0,          1,
+            6,        21,        56,        126,        252,        462,
+          792,      1287,      2002,       3003,       4368,       6188,
+         8568,     11628,     15504,      20349,      26334,      33649,
+        42504,     53130,     65780,      80730,      98280,     118755,
+       142506,    169911,    201376,     237336,     278256,     324632,
+       376992,    435897,    501942,     575757,     658008,     749398,
+       850668,    962598,   1086008,    1221759,    1370754,    1533939,
+      1712304,   1906884,   2118760,    2349060,    2598960,    2869685,
+      3162510,   3478761,   3819816,    4187106,    4582116,    5006386,
+      5461512,   5949147,   6471002,    7028847,    7624512,    8259888,
+      8936928,   9657648,  10424128,   11238513,   12103014,   13019909 },
+    {       0,         0,         0,          0,          0,          0,
+            1,         7,        28,         84,        210,        462,
+          924,      1716,      3003,       5005,       8008,      12376,
+        18564,     27132,     38760,      54264,      74613,     100947,
+       134596,    177100,    230230,     296010,     376740,     475020,
+       593775,    736281,    906192,    1107568,    1344904,    1623160,
+      1947792,   2324784,   2760681,    3262623,    3838380,    4496388,
+      5245786,   6096454,   7059052,    8145060,    9366819,   10737573,
+     12271512,  13983816,  15890700,   18009460,   20358520,   22957480,
+     25827165,  28989675,  32468436,   36288252,   40475358,   45057474,
+     50063860,  55525372,  61474519,   67945521,   74974368,   82598880,
+     90858768,  99795696, 109453344,  119877472,  131115985,  143218999 },
+    {       0,         0,         0,          0,          0,          0,
+            0,         1,         8,         36,        120,        330,
+          792,      1716,      3432,       6435,      11440,      19448,
+        31824,     50388,     77520,     116280,     170544,     245157,
+       346104,    480700,    657800,     888030,    1184040,    1560780,
+      2035800,   2629575,   3365856,    4272048,    5379616,    6724520,
+      8347680,  10295472,  12620256,   15380937,   18643560,   22481940,
+     26978328,  32224114,  38320568,   45379620,   53524680,   62891499,
+     73629072,  85900584,  99884400,  115775100,  133784560,  154143080,
+    177100560, 202927725, 231917400,  264385836,  300674088,  341149446,
+    386206920, 436270780, 491796152,  553270671,  621216192,  696190560,
+    778789440, 869648208, 969443904, 1078897248, 1198774720, 1329890705 },
+};
+
+static const int16_t dss_sp_filter_cb[14][32] = {
+    { -32653, -32587, -32515, -32438, -32341, -32216, -32062, -31881,
+      -31665, -31398, -31080, -30724, -30299, -29813, -29248, -28572,
+      -27674, -26439, -24666, -22466, -19433, -16133, -12218,  -7783,
+       -2834,   1819,   6544,  11260,  16050,  20220,  24774,  28120 },
+
+    { -27503, -24509, -20644, -17496, -14187, -11277,  -8420,  -5595,
+       -3013,   -624,   1711,   3880,   5844,   7774,   9739,  11592,
+       13364,  14903,  16426,  17900,  19250,  20586,  21803,  23006,
+       24142,  25249,  26275,  27300,  28359,  29249,  30118,  31183 },
+
+    { -27827, -24208, -20943, -17781, -14843, -11848,  -9066,  -6297,
+       -3660,   -910,   1918,   5025,   8223,  11649,  15086,  18423,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0 },
+
+    { -17128, -11975,  -8270,  -5123,  -2296,    183,   2503,   4707,
+        6798,   8945,  11045,  13239,  15528,  18248,  21115,  24785,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0 },
+
+    { -21557, -17280, -14286, -11644,  -9268,  -7087,  -4939,  -2831,
+        -691,   1407,   3536,   5721,   8125,  10677,  13721,  17731,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0 },
+
+    { -15030, -10377,  -7034,  -4327,  -1900,    364,   2458,   4450,
+        6422,   8374,  10374,  12486,  14714,  16997,  19626,  22954,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0 },
+
+    { -16155, -12362,  -9698,  -7460,  -5258,  -3359,  -1547,    219,
+        1916,   3599,   5299,   6994,   8963,  11226,  13716,  16982,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0 },
+
+    { -14742,  -9848,  -6921,  -4648,  -2769,  -1065,    499,   2083,
+        3633,   5219,   6857,   8580,  10410,  12672,  15561,  20101,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0 },
+
+    { -11099,  -7014,  -3855,  -1025,   1680,   4544,   7807,  11932,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0 },
+
+    {  -9060,  -4570,  -1381,   1419,   4034,   6728,   9865,  14149,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0 },
+
+    { -12450,  -7985,  -4596,  -1734,    961,   3629,   6865,  11142,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0 },
+
+    { -11831,  -7404,  -4010,  -1096,   1606,   4291,   7386,  11482,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0 },
+
+    { -13404,  -9250,  -5995,  -3312,   -890,   1594,   4464,   8198,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0 },
+
+    { -11239,  -7220,  -4040,  -1406,    971,   3321,   6006,   9697,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0,
+           0,      0,      0,      0,      0,      0,      0,      0 },
+};
+
+static const uint16_t  dss_sp_fixed_cb_gain[64] = {
+       0,    4,    8,   13,   17,   22,   26,   31,
+      35,   40,   44,   48,   53,   58,   63,   69,
+      76,   83,   91,   99,  109,  119,  130,  142,
+     155,  170,  185,  203,  222,  242,  265,  290,
+     317,  346,  378,  414,  452,  494,  540,  591,
+     646,  706,  771,  843,  922, 1007, 1101, 1204,
+    1316, 1438, 1572, 1719, 1879, 2053, 2244, 2453,
+    2682, 2931, 3204, 3502, 3828, 4184, 4574, 5000,
+};
+
+static const int16_t  dss_sp_pulse_val[8] = {
+    -31182, -22273, -13364, -4455, 4455, 13364, 22273, 31182
+};
+
+static const uint16_t binary_decreasing_array[] = {
+    32767, 16384, 8192, 4096, 2048, 1024, 512, 256,
+    128, 64, 32, 16, 8, 4, 2,
+};
+
+static const uint16_t dss_sp_unc_decreasing_array[] = {
+    32767, 26214, 20972, 16777, 13422, 10737, 8590, 6872,
+    5498, 4398, 3518, 2815, 2252, 1801, 1441,
+};
+
+static const uint16_t dss_sp_adaptive_gain[] = {
+     102,  231,  360,  488,  617,  746,  875, 1004,
+    1133, 1261, 1390, 1519, 1648, 1777, 1905, 2034,
+    2163, 2292, 2421, 2550, 2678, 2807, 2936, 3065,
+    3194, 3323, 3451, 3580, 3709, 3838, 3967, 4096,
+};
+
+static const int32_t dss_sp_sinc[67] = {
+      262,   293,   323,   348,   356,   336,   269,   139,
+      -67,  -358,  -733, -1178, -1668, -2162, -2607, -2940,
+    -3090, -2986, -2562, -1760,  -541,  1110,  3187,  5651,
+     8435, 11446, 14568, 17670, 20611, 23251, 25460, 27125,
+    28160, 28512, 28160,
+    27125, 25460, 23251, 20611, 17670, 14568, 11446,  8435,
+     5651,  3187,  1110,  -541, -1760, -2562, -2986, -3090,
+    -2940, -2607, -2162, -1668, -1178,  -733,  -358,   -67,
+      139,   269,   336,   356,   348,   323,   293,   262,
+};
+
+static av_cold int dss_sp_decode_init(AVCodecContext *avctx)
+{
+    DssSpContext *p = avctx->priv_data;
+    avctx->channel_layout = AV_CH_LAYOUT_MONO;
+    avctx->sample_fmt     = AV_SAMPLE_FMT_S16;
+    avctx->channels       = 1;
+    avctx->sample_rate    = 11025;
+
+    memset(p->history, 0, sizeof(p->history));
+    p->pulse_dec_mode = 1;
+
+    return 0;
+}
+
+static void dss_sp_unpack_coeffs(DssSpContext *p, const uint8_t *src)
+{
+    GetBitContext gb;
+    DssSpFrame *fparam = &p->fparam;
+    int i;
+    int subframe_idx;
+    uint32_t combined_pitch;
+    uint32_t tmp;
+    uint32_t pitch_lag;
+
+    for (i = 0; i < DSS_SP_FRAME_SIZE; i += 2) {
+        p->bits[i]     = src[i + 1];
+        p->bits[i + 1] = src[i];
+    }
+
+    init_get_bits(&gb, p->bits, DSS_SP_FRAME_SIZE * 8);
+
+    for (i = 0; i < 2; i++)
+        fparam->filter_idx[i] = get_bits(&gb, 5);
+    for (; i < 8; i++)
+        fparam->filter_idx[i] = get_bits(&gb, 4);
+    for (; i < 14; i++)
+        fparam->filter_idx[i] = get_bits(&gb, 3);
+
+    for (subframe_idx = 0; subframe_idx < 4; subframe_idx++) {
+        fparam->sf_adaptive_gain[subframe_idx] = get_bits(&gb, 5);
+
+        fparam->sf[subframe_idx].combined_pulse_pos = get_bits_long(&gb, 31);
+
+        fparam->sf[subframe_idx].gain = get_bits(&gb, 6);
+
+        for (i = 0; i < 7; i++)
+            fparam->sf[subframe_idx].pulse_val[i] = get_bits(&gb, 3);
+    }
+
+    for (subframe_idx = 0; subframe_idx < 4; subframe_idx++) {
+        unsigned int C72_binomials[PULSE_MAX] = {
+            72, 2556, 59640, 1028790, 13991544, 156238908, 1473109704,
+            3379081753
+        };
+        unsigned int combined_pulse_pos =
+            fparam->sf[subframe_idx].combined_pulse_pos;
+        int index = 6;
+
+        if (combined_pulse_pos < C72_binomials[PULSE_MAX - 1]) {
+            if (p->pulse_dec_mode) {
+                int pulse, pulse_idx;
+                pulse              = PULSE_MAX - 1;
+                pulse_idx          = 71;
+                combined_pulse_pos =
+                    fparam->sf[subframe_idx].combined_pulse_pos;
+
+                /* this part seems to be close to g723.1 gen_fcb_excitation()
+                 * RATE_6300 */
+
+                /* TODO: what is 7? size of subframe? */
+                for (i = 0; i < 7; i++) {
+                    for (;
+                         combined_pulse_pos <
+                         dss_sp_combinatorial_table[pulse][pulse_idx];
+                         --pulse_idx)
+                        ;
+                    combined_pulse_pos -=
+                        dss_sp_combinatorial_table[pulse][pulse_idx];
+                    pulse--;
+                    fparam->sf[subframe_idx].pulse_pos[i] = pulse_idx;
+                }
+            }
+        } else {
+            p->pulse_dec_mode = 0;
+
+            /* why do we need this? */
+            fparam->sf[subframe_idx].pulse_pos[6] = 0;
+
+            for (i = 71; i >= 0; i--) {
+                if (C72_binomials[index] <= combined_pulse_pos) {
+                    combined_pulse_pos -= C72_binomials[index];
+
+                    fparam->sf[subframe_idx].pulse_pos[(index ^ 7) - 1] = i;
+
+                    if (!index)
+                        break;
+                    --index;
+                }
+                --C72_binomials[0];
+                if (index) {
+                    int a;
+                    for (a = 0; a < index; a++)
+                        C72_binomials[a + 1] -= C72_binomials[a];
+                }
+            }
+        }
+    }
+
+    combined_pitch = get_bits(&gb, 24);
+
+    fparam->pitch_lag[0] = (combined_pitch % 151) + 36;
+
+    combined_pitch /= 151;
+
+    for (i = 1; i < SUBFRAMES; i++) {
+        fparam->pitch_lag[i] = combined_pitch % 48;
+        combined_pitch      /= 48;
+    }
+
+    pitch_lag = fparam->pitch_lag[0];
+    for (i = 1; i < SUBFRAMES; i++) {
+        if (pitch_lag > 162) {
+            fparam->pitch_lag[i] += 162 - 23;
+        } else {
+            tmp = pitch_lag - 23;
+            if (tmp < 36)
+                tmp = 36;
+            fparam->pitch_lag[i] += tmp;
+        }
+        pitch_lag = fparam->pitch_lag[i];
+    }
+}
+
+static void dss_sp_unpack_filter(DssSpContext *p)
+{
+    int i;
+
+    for (i = 0; i < 14; i++)
+        p->lpc_filter[i] = dss_sp_filter_cb[i][p->fparam.filter_idx[i]];
+}
+
+static void dss_sp_convert_coeffs(int32_t *lpc_filter, int32_t *coeffs)
+{
+    int a, a_plus, i;
+
+    coeffs[0] = 0x2000;
+    for (a = 0; a < 14; a++) {
+        a_plus         = a + 1;
+        coeffs[a_plus] = lpc_filter[a] >> 2;
+        if (a_plus / 2 >= 1) {
+            for (i = 1; i <= a_plus / 2; i++) {
+                int coeff_1, coeff_2, tmp;
+
+                coeff_1 = coeffs[i];
+                coeff_2 = coeffs[a_plus - i];
+
+                tmp = DSS_SP_FORMULA(coeff_1, lpc_filter[a], coeff_2);
+                coeffs[i] = av_clip_int16(tmp);
+
+                tmp = DSS_SP_FORMULA(coeff_2, lpc_filter[a], coeff_1);
+                coeffs[a_plus - i] = av_clip_int16(tmp);
+            }
+        }
+    }
+}
+
+static void dss_sp_add_pulses(int32_t *vector_buf,
+                              const struct DssSpSubframe *sf)
+{
+    int i;
+
+    for (i = 0; i < 7; i++)
+        vector_buf[sf->pulse_pos[i]] += (dss_sp_fixed_cb_gain[sf->gain] *
+                                         dss_sp_pulse_val[sf->pulse_val[i]] +
+                                         0x4000) >> 15;
+}
+
+static void dss_sp_gen_exc(int32_t *vector, int32_t *prev_exc,
+                           int pitch_lag, int gain)
+{
+    int i;
+
+    /* do we actually need this check? we can use just [a3 - i % a3]
+     * for both cases */
+    if (pitch_lag < 72)
+        for (i = 0; i < 72; i++)
+            vector[i] = prev_exc[pitch_lag - i % pitch_lag];
+    else
+        for (i = 0; i < 72; i++)
+            vector[i] = prev_exc[pitch_lag - i];
+
+    for (i = 0; i < 72; i++) {
+        int tmp = gain * vector[i] >> 11;
+        vector[i] = av_clip_int16(tmp);
+    }
+}
+
+static void dss_sp_scale_vector(int32_t *vec, int bits, int size)
+{
+    int i;
+
+    if (bits < 0)
+        for (i = 0; i < size; i++)
+            vec[i] = vec[i] >> -bits;
+    else
+        for (i = 0; i < size; i++)
+            vec[i] = vec[i] << bits;
+}
+
+static void dss_sp_update_buf(int32_t *hist, int32_t *vector)
+{
+    int i;
+
+    for (i = 114; i > 0; i--)
+        vector[i + 72] = vector[i];
+
+    for (i = 0; i < 72; i++)
+        vector[72 - i] = hist[i];
+}
+
+static void dss_sp_shift_sq_sub(const int32_t *filter_buf,
+                                int32_t *error_buf, int32_t *dst)
+{
+    int a;
+
+    for (a = 0; a < 72; a++) {
+        int i, tmp;
+
+        tmp = dst[a] * filter_buf[0];
+
+        for (i = 14; i > 0; i--)
+            tmp -= error_buf[i] * filter_buf[i];
+
+        for (i = 14; i > 0; i--)
+            error_buf[i] = error_buf[i - 1];
+
+        tmp = (tmp + 4096) >> 13;
+
+        error_buf[1] = tmp;
+
+        dst[a] = av_clip_int16(tmp);
+    }
+}
+
+static void dss_sp_shift_sq_add(const int32_t *filter_buf, int32_t *audio_buf,
+                                int32_t *dst)
+{
+    int a;
+
+    for (a = 0; a < 72; a++) {
+        int i, tmp = 0;
+
+        audio_buf[0] = dst[a];
+
+        for (i = 14; i >= 0; i--)
+            tmp += audio_buf[i] * filter_buf[i];
+
+        for (i = 14; i > 0; i--)
+            audio_buf[i] = audio_buf[i - 1];
+
+        tmp = (tmp + 4096) >> 13;
+
+        dst[a] = av_clip_int16(tmp);
+    }
+}
+
+static void dss_sp_vec_mult(const int32_t *src, int32_t *dst,
+                            const int16_t *mult)
+{
+    int i;
+
+    dst[0] = src[0];
+
+    for (i = 1; i < 15; i++)
+        dst[i] = (src[i] * mult[i] + 0x4000) >> 15;
+}
+
+static int dss_sp_get_normalize_bits(int32_t *vector_buf, int16_t size)
+{
+    unsigned int val;
+    int max_val;
+    int i;
+
+    val = 1;
+    for (i = 0; i < size; i++)
+        val |= FFABS(vector_buf[i]);
+
+    for (max_val = 0; val <= 0x4000; ++max_val)
+        val *= 2;
+    return max_val;
+}
+
+static int dss_sp_vector_sum(DssSpContext *p, int size)
+{
+    int i, sum = 0;
+    for (i = 0; i < size; i++)
+        sum += FFABS(p->vector_buf[i]);
+    return sum;
+}
+
+static void dss_sp_sf_synthesis(DssSpContext *p, int32_t lpc_filter,
+                                int32_t *dst, int size)
+{
+    int32_t tmp_buf[15];
+    int32_t noise[72];
+    int bias, vsum_2 = 0, vsum_1 = 0, v36, normalize_bits;
+    int i, tmp;
+
+    if (size > 0) {
+        vsum_1 = dss_sp_vector_sum(p, size);
+
+        if (vsum_1 > 0xFFFFF)
+            vsum_1 = 0xFFFFF;
+    }
+
+    normalize_bits = dss_sp_get_normalize_bits(p->vector_buf, size);
+
+    dss_sp_scale_vector(p->vector_buf, normalize_bits - 3, size);
+    dss_sp_scale_vector(p->audio_buf, normalize_bits, 15);
+    dss_sp_scale_vector(p->err_buf1, normalize_bits, 15);
+
+    v36 = p->err_buf1[1];
+
+    dss_sp_vec_mult(p->filter, tmp_buf, binary_decreasing_array);
+    dss_sp_shift_sq_add(tmp_buf, p->audio_buf, p->vector_buf);
+
+    dss_sp_vec_mult(p->filter, tmp_buf, dss_sp_unc_decreasing_array);
+    dss_sp_shift_sq_sub(tmp_buf, p->err_buf1, p->vector_buf);
+
+    /* lpc_filter can be negative */
+    lpc_filter = lpc_filter >> 1;
+    if (lpc_filter >= 0)
+        lpc_filter = 0;
+
+    if (size > 1) {
+        for (i = size - 1; i > 0; i--) {
+            tmp = DSS_SP_FORMULA(p->vector_buf[i], lpc_filter,
+                                 p->vector_buf[i - 1]);
+            p->vector_buf[i] = av_clip_int16(tmp);
+        }
+    }
+
+    tmp              = DSS_SP_FORMULA(p->vector_buf[0], lpc_filter, v36);
+    p->vector_buf[0] = av_clip_int16(tmp);
+
+    dss_sp_scale_vector(p->vector_buf, -normalize_bits, size);
+    dss_sp_scale_vector(p->audio_buf, -normalize_bits, 15);
+    dss_sp_scale_vector(p->err_buf1, -normalize_bits, 15);
+
+    if (size > 0)
+        vsum_2 = dss_sp_vector_sum(p, size);
+
+    if (vsum_2 >= 0x40)
+        tmp = (vsum_1 << 11) / vsum_2;
+    else
+        tmp = 1;
+
+    bias     = 409 * tmp >> 15 << 15;
+    tmp      = (bias + 32358 * p->noise_state) >> 15;
+    noise[0] = av_clip_int16(tmp);
+
+    for (i = 1; i < size; i++) {
+        tmp      = (bias + 32358 * noise[i - 1]) >> 15;
+        noise[i] = av_clip_int16(tmp);
+    }
+
+    p->noise_state = noise[size - 1];
+    for (i = 0; i < size; i++) {
+        tmp    = (p->vector_buf[i] * noise[i]) >> 11;
+        dst[i] = av_clip_int16(tmp);
+    }
+}
+
+static void dss_sp_update_state(DssSpContext *p, int32_t *dst)
+{
+    int i, offset = 6, counter = 0, a = 0;
+
+    for (i = 0; i < 6; i++)
+        p->excitation[i] = p->excitation[288 + i];
+
+    for (i = 0; i < 72 * SUBFRAMES; i++)
+        p->excitation[6 + i] = dst[i];
+
+    do {
+        int tmp = 0;
+
+        for (i = 0; i < 6; i++)
+            tmp += p->excitation[offset--] * dss_sp_sinc[a + i * 11];
+
+        offset += 7;
+
+        tmp >>= 15;
+        dst[counter] = av_clip_int16(tmp);
+
+        counter++;
+
+        a = (a + 1) % 11;
+        if (!a)
+            offset++;
+    } while (offset < FF_ARRAY_ELEMS(p->excitation));
+}
+
+static void dss_sp_32to16bit(int16_t *dst, int32_t *src, int size)
+{
+    int i;
+
+    for (i = 0; i < size; i++)
+        dst[i] = av_clip_int16(src[i]);
+}
+
+static int dss_sp_decode_one_frame(DssSpContext *p,
+                                   int16_t *abuf_dst, const uint8_t *abuf_src)
+{
+    int i, j;
+
+    dss_sp_unpack_coeffs(p, abuf_src);
+
+    dss_sp_unpack_filter(p);
+
+    dss_sp_convert_coeffs(p->lpc_filter, p->filter);
+
+    for (j = 0; j < SUBFRAMES; j++) {
+        dss_sp_gen_exc(p->vector_buf, p->history,
+                       p->fparam.pitch_lag[j],
+                       dss_sp_adaptive_gain[p->fparam.sf_adaptive_gain[j]]);
+
+        dss_sp_add_pulses(p->vector_buf, &p->fparam.sf[j]);
+
+        dss_sp_update_buf(p->vector_buf, p->history);
+
+        for (i = 0; i < 72; i++)
+            p->vector_buf[i] = p->history[72 - i];
+
+        dss_sp_shift_sq_sub(p->filter,
+                            p->err_buf2, p->vector_buf);
+
+        dss_sp_sf_synthesis(p, p->lpc_filter[0],
+                            &p->working_buffer[j][0], 72);
+    }
+
+    dss_sp_update_state(p, &p->working_buffer[0][0]);
+
+    dss_sp_32to16bit(abuf_dst,
+                     &p->working_buffer[0][0], 264);
+    return 0;
+}
+
+static int dss_sp_decode_frame(AVCodecContext *avctx, void *data,
+                               int *got_frame_ptr, AVPacket *avpkt)
+{
+    DssSpContext *p    = avctx->priv_data;
+    AVFrame *frame     = data;
+    const uint8_t *buf = avpkt->data;
+    int buf_size       = avpkt->size;
+
+    int16_t *out;
+    int ret;
+
+    if (buf_size < DSS_SP_FRAME_SIZE) {
+        if (buf_size)
+            av_log(avctx, AV_LOG_WARNING,
+                   "Expected %d bytes, got %d - skipping packet.\n",
+                   DSS_SP_FRAME_SIZE, buf_size);
+        *got_frame_ptr = 0;
+        return AVERROR_INVALIDDATA;
+    }
+
+    frame->nb_samples = DSS_SP_SAMPLE_COUNT;
+    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed.\n");
+        return ret;
+    }
+
+    out = (int16_t *)frame->data[0];
+
+    dss_sp_decode_one_frame(p, out, buf);
+
+    *got_frame_ptr = 1;
+
+    return DSS_SP_FRAME_SIZE;
+}
+
+AVCodec ff_dss_sp_decoder = {
+    .name           = "DSS SP",
+    .long_name      = NULL_IF_CONFIG_SMALL("Digital Speech Standard - Standard Play mode (DSS SP)"),
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = AV_CODEC_ID_DSS_SP,
+    .priv_data_size = sizeof(DssSpContext),
+    .init           = dss_sp_decode_init,
+    .decode         = dss_sp_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+};