Grundig DigtaSoft dictation devices store recordings in a DSS container
variant identified by the magic byte 6 ('\x06dss') and a fixed six-block
(6 x 512 byte) header. Its audio payload is not the Olympus DSS-SP or
G.723.1 codec already supported by the dss demuxer, but a distinct CELP
coder (Digta SP), as produced and decoded by Grundig's dss2wav codec.
The codec operates at a native 12 kHz sampling rate. Each 41-byte
(328-bit) frame yields 288 samples (4 subframes x 72). A frame carries
14 reflection-coefficient indices feeding an order-14 lattice synthesis
filter, four differential pitch lags packed into a single 24-bit field
and, per subframe, an adaptive (pitch) gain, a 31-bit fixed-codebook
index that enumerates 7 pulses through cumulative binomial tables, a
fixed-codebook gain and 7 pulse signs. The excitation is the sum of an
adaptive (pitch repetition x gain) and a fixed (7 signed pulses)
contribution; a de-emphasis filter (y[n] = x[n] + 0.1*y[n-1]) and
rounding/clamping to int16 follow.
The Grundig device resamples the 12 kHz signal to 16 kHz with a 3:4
polyphase FIR for playback. That resampling is a device post-process
and is intentionally left to libswresample; the decoder emits the
codec's native 12 kHz rate. The decoder uses f64 arithmetic and
floor(x + 0.5) rounding and is bit-exact against the reference codec.
The demuxer is extended to detect the '\x06dss' variant, expose a new
AV_CODEC_ID_GRUNDIG_SP stream at 12000 Hz, and emit the 41-byte frames
following the Grundig block rule (b2 frames start per block at the
(b1<<8|b0)>>4 bit offset, frames forming a continuous bitstream that
spans block boundaries). The existing Olympus DSS-SP / G.723.1 paths
are untouched.
A framecrc FATE test (fate-dss-grundig-sp) is added.
Signed-off-by: Guillain d'Erceville <[email protected]>
---
libavcodec/Makefile | 1 +
libavcodec/allcodecs.c | 1 +
libavcodec/codec_desc.c | 7 +
libavcodec/codec_id.h | 1 +
libavcodec/grundig_sp.c | 624 ++++++++++++++++++++++++++++++++++
libavformat/dss.c | 211 +++++++++++-
tests/fate/audio.mak | 3 +
tests/ref/fate/dss-grundig-sp | 156 +++++++++
8 files changed, 1002 insertions(+), 2 deletions(-)
create mode 100644 libavcodec/grundig_sp.c
create mode 100644 tests/ref/fate/dss-grundig-sp
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index e68d2db..0e5b5e8 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -413,6 +413,7 @@ OBJS-$(CONFIG_GEM_DECODER) += gemdec.o
OBJS-$(CONFIG_GIF_DECODER) += gifdec.o lzw.o
OBJS-$(CONFIG_GIF_ENCODER) += gif.o lzwenc.o
OBJS-$(CONFIG_GREMLIN_DPCM_DECODER) += dpcm.o
+OBJS-$(CONFIG_GRUNDIG_SP_DECODER) += grundig_sp.o
OBJS-$(CONFIG_GSM_DECODER) += gsmdec.o gsmdec_data.o msgsmdec.o
OBJS-$(CONFIG_GSM_MS_DECODER) += gsmdec.o gsmdec_data.o msgsmdec.o
OBJS-$(CONFIG_H261_DECODER) += h261dec.o h261data.o h261.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 0815d46..476056c 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -488,6 +488,7 @@ extern const FFCodec ff_g723_1_encoder;
extern const FFCodec ff_g723_1_decoder;
extern const FFCodec ff_g728_decoder;
extern const FFCodec ff_g729_decoder;
+extern const FFCodec ff_grundig_sp_decoder;
extern const FFCodec ff_gsm_decoder;
extern const FFCodec ff_gsm_ms_decoder;
extern const FFCodec ff_hca_decoder;
diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c
index 99e7c0d..d339259 100644
--- a/libavcodec/codec_desc.c
+++ b/libavcodec/codec_desc.c
@@ -3575,6 +3575,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
.long_name = NULL_IF_CONFIG_SMALL("CRI AHX"),
.props = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
},
+ {
+ .id = AV_CODEC_ID_GRUNDIG_SP,
+ .type = AVMEDIA_TYPE_AUDIO,
+ .name = "grundig_sp",
+ .long_name = NULL_IF_CONFIG_SMALL("Grundig DSS-SP (Digta CELP)"),
+ .props = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
+ },
/* subtitle codecs */
{
diff --git a/libavcodec/codec_id.h b/libavcodec/codec_id.h
index bb2c16a..db80f3f 100644
--- a/libavcodec/codec_id.h
+++ b/libavcodec/codec_id.h
@@ -567,6 +567,7 @@ enum AVCodecID {
AV_CODEC_ID_LC3,
AV_CODEC_ID_G728,
AV_CODEC_ID_AHX,
+ AV_CODEC_ID_GRUNDIG_SP,
/* subtitle codecs */
AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at
the start of subtitle codecs.
diff --git a/libavcodec/grundig_sp.c b/libavcodec/grundig_sp.c
new file mode 100644
index 0000000..dbb7820
--- /dev/null
+++ b/libavcodec/grundig_sp.c
@@ -0,0 +1,624 @@
+/*
+ * Grundig DSS-SP (Digta CELP) audio decoder.
+ * Copyright (c) 2026 Guillain d'Erceville <[email protected]>
+ *
+ * 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
+ */
+
+/*
+ * Grundig DSS-SP ('\x06dss' / Digta SP) decoder, as found in Grundig DigtaSoft
+ * .dss recordings and produced by the Grundig dss2wav reference codec.
+ *
+ * It is a CELP coder operating at a native 12 kHz sampling rate: each 41-byte
+ * (328-bit) frame yields 288 samples (4 subframes x 72 samples). Each frame
+ * carries 14 reflection-coefficient indices (a lattice synthesis filter of
+ * order 14), four differential pitch lags packed into a single 24-bit field,
+ * and, per subframe, an adaptive (pitch) gain, a 31-bit fixed-codebook index
+ * enumerating 7 pulses via cumulative binomial tables, a fixed-codebook gain
+ * and 7 pulse signs. Excitation = adaptive (pitch repeat x gain) + fixed
+ * (7 signed pulses); an order-14 lattice synthesis filter and a de-emphasis
+ * filter (y[n] = x[n] + 0.1*y[n-1]) follow.
+ *
+ * The Grundig device resamples this 12 kHz signal to 16 kHz with a 3:4
+ * polyphase FIR for playback; that resampling is a device post-process and is
+ * intentionally left to libswresample -- this decoder emits the codec's native
+ * 12 kHz rate.
+ *
+ * The decoder uses f64 arithmetic and floor(x + 0.5) rounding to remain
+ * bit-exact against the reference codec.
+ */
+
+#include <math.h>
+#include <string.h>
+
+#include "libavutil/channel_layout.h"
+
+#include "avcodec.h"
+#include "codec_internal.h"
+#include "decode.h"
+#include "get_bits.h"
+
+#define GRUNDIG_FRAME_BYTES 41
+#define GRUNDIG_FRAME_BITS 328
+#define GRUNDIG_SUBFRAMES 4
+#define GRUNDIG_SUBLEN 72
+#define GRUNDIG_SAMPLES (GRUNDIG_SUBFRAMES * GRUNDIG_SUBLEN) /* 288 */
+#define GRUNDIG_ORDER 14
+#define GRUNDIG_HIST 187
+
+/* de-emphasis pole (y[n] = x[n] - DEEMPH_POLE*y[n-1], DEEMPH_POLE = -0.1) */
+#define GRUNDIG_DEEMPH_POLE (-0.1)
+
+/* Auto-generated from gtables.json (dss2wav.dll .data). Do not edit by hand.
*/
+
+static const double grundig_lpc0[448] = {
+ -0x1.fe33e3fffffffp-1, -0x1.fd2bce0000002p-1, -0x1.fc0b47fffffffp-1,
-0x1.fad7340000001p-1,
+ -0x1.f955420000000p-1, -0x1.f7602c0000001p-1, -0x1.f4f8520000000p-1,
-0x1.f225ddfffffffp-1,
+ -0x1.eec499fffffffp-1, -0x1.ea96d80000000p-1, -0x1.e5a15dfffffffp-1,
-0x1.e00fe20000000p-1,
+ -0x1.d96c340000000p-1, -0x1.d1d46e0000000p-1, -0x1.c900540000001p-1,
-0x1.be6e720000001p-1,
+ -0x1.b0674c0000000p-1, -0x1.9d1da20000001p-1, -0x1.8166adfffffffp-1,
-0x1.5f06020000000p-1,
+ -0x1.2fa5680000000p-1, -0x1.f824780000001p-2, -0x1.7dd0bdfffffffp-2,
-0x1.e6704e0000001p-3,
+ -0x1.6245940000000p-4, 0x1.c6b3600000001p-5, 0x1.98fd860000002p-3,
0x1.5fe3de0000000p-2,
+ 0x1.f58e500000001p-2, 0x1.3bf1160000000p-1, 0x1.8317660000000p-1,
0x1.b75ee80000001p-1,
+ -0x1.adbc03fffffffp-1, -0x1.7ef4940000000p-1, -0x1.428fdc0000000p-1,
-0x1.1160ce0000000p-1,
+ -0x1.bb586c0000001p-2, -0x1.60660ffffffffp-2, -0x1.0721380000000p-2,
-0x1.5da9ec0000000p-3,
+ -0x1.78a905fffffffp-4, -0x1.37ef600000001p-6, 0x1.abd243fffffffp-5,
0x1.e4f033fffffffp-4,
+ 0x1.6d455e0000001p-3, 0x1.e5e583ffffffep-3, 0x1.3059120000000p-2,
0x1.6a41ddfffffffp-2,
+ 0x1.a1a15dfffffffp-2, 0x1.d1ba7c0000000p-2, 0x1.00a9420000000p-1,
0x1.17b15a0000000p-1,
+ 0x1.2cc92e0000000p-1, 0x1.41a6760000000p-1, 0x1.54adb00000000p-1,
0x1.6776540000000p-1,
+ 0x1.7936a40000000p-1, 0x1.8a84b00000000p-1, 0x1.9a8d720000000p-1,
0x1.aa8fb9fffffffp-1,
+ 0x1.bb1c680000000p-1, 0x1.c904380000000p-1, 0x1.d69727fffffffp-1,
0x1.e73ab80000000p-1,
+ -0x1.b2ccd80000000p-1, -0x1.7a40860000000p-1, -0x1.473bca0000000p-1,
-0x1.15d36c0000000p-1,
+ -0x1.cfd8c60000000p-2, -0x1.723dadfffffffp-2, -0x1.1b4c320000000p-2,
-0x1.8989b60000002p-3,
+ -0x1.c985d40000000p-4, -0x1.c733640000000p-6, 0x1.df9df60000000p-5,
0x1.3a0d120000000p-3,
+ 0x1.00f64ffffffffp-2, 0x1.6c05720000000p-2, 0x1.d773300000000p-2,
0x1.1fdbec0000000p-1,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.0b9e800000000p-1, -0x1.76369c0000000p-2, -0x1.026c2e0000000p-2,
-0x1.402ef80000000p-3,
+ -0x1.1efb400000000p-4, 0x1.6e5ad40000000p-8, 0x1.38ef380000000p-4,
0x1.26303e0000000p-3,
+ 0x1.a8dc940000000p-3, 0x1.1784760000000p-2, 0x1.592859fffffffp-2,
0x1.9db65c0000000p-2,
+ 0x1.e53cadfffffffp-2, 0x1.1d21580000000p-1, 0x1.49eb520000000p-1,
0x1.8344080000001p-1,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.50d3e60000000p-1, -0x1.0e00b20000000p-1, -0x1.be732e0000000p-2,
-0x1.6bde6c0000000p-2,
+ -0x1.219eb1fffffffp-2, -0x1.baf243fffffffp-3, -0x1.34acd20000000p-3,
-0x1.61e7f80000000p-4,
+ -0x1.5943d80000000p-6, 0x1.5fa2d60000000p-5, 0x1.ba0d460000002p-4,
0x1.6591280000000p-3,
+ 0x1.fbc9b40000001p-3, 0x1.4daa180000000p-2, 0x1.acc45c0000001p-2,
0x1.150dec0000000p-1,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.d5b16c0000001p-2, -0x1.4444da0000001p-2, -0x1.b7a37fffffffep-3,
-0x1.0e74520000000p-3,
+ -0x1.dae0a60000000p-5, 0x1.6c48ee0000003p-7, 0x1.333b200000000p-4,
0x1.161b8c0000000p-3,
+ 0x1.9160b7fffffffp-3, 0x1.05ae860000001p-2, 0x1.44301e0000000p-2,
0x1.86307bfffffffp-2,
+ 0x1.cbccd40000000p-2, 0x1.09921e0000000p-1, 0x1.32a9620000000p-1,
0x1.66a9260000000p-1,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.f8d7ec0000000p-2, -0x1.824ee9ffffffep-2, -0x1.2f0cabfffffffp-2,
-0x1.d23ea7ffffffep-3,
+ -0x1.489fcc0000001p-3, -0x1.a3e7380000003p-4, -0x1.82b8480000000p-5,
0x1.b575800000000p-8,
+ 0x1.df0c5c0000000p-5, 0x1.c1d8000000004p-4, 0x1.4b3277ffffffep-3,
0x1.b51bd80000001p-3,
+ 0x1.1818480000001p-2, 0x1.5ece51fffffffp-2, 0x1.aca1100000001p-2,
0x1.0957740000000p-1,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.ccad4bfffffffp-2, -0x1.33bec80000000p-2, -0x1.b08d040000002p-3,
-0x1.228367fffffffp-3,
+ -0x1.5a2dc40000000p-4, -0x1.0a5ba60000000p-5, 0x1.f2b7adffffffdp-7,
0x1.046bfe0000000p-4,
+ 0x1.c61c3a0000001p-4, 0x1.4636da0000000p-3, 0x1.ac942bfffffffp-3,
0x1.0c23fa0000001p-2,
+ 0x1.455159fffffffp-2, 0x1.8bfde80000000p-2, 0x1.e648b40000000p-2,
0x1.3a14900000000p-1,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.5ad96e0000001p-2, -0x1.b667480000001p-3, -0x1.e1d3a7ffffffcp-4,
-0x1.00391a0000000p-5,
+ 0x1.a3eae00000000p-5, 0x1.1bf95dfffffffp-3, 0x1.e7f4d80000001p-3,
0x1.74e2380000000p-2,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.1b22fe0000000p-2, -0x1.1da4e7fffffffp-3, -0x1.594e49fffffffp-5,
0x1.62ae2e0000000p-5,
+ 0x1.f84de40000005p-4, 0x1.a484380000001p-3, 0x1.3449c40000000p-2,
0x1.ba24940000000p-2,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.85109dfffffffp-2, -0x1.f3158dfffffffp-3, -0x1.1f432a0000000p-3,
-0x1.b169ce0000000p-5,
+ 0x1.e08677fffffffp-6, 0x1.c5a8400000003p-4, 0x1.ad0d7e0000001p-3,
0x1.5c2e480000000p-2,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.71b4620000000p-2, -0x1.ceb98fffffffdp-3, -0x1.f53cf80000000p-4,
-0x1.120f460000001p-5,
+ 0x1.9180cc0000000p-5, 0x1.0c2dda0000000p-3, 0x1.cd9895fffffffp-3,
0x1.66cdf40000000p-2,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.a2e261fffffffp-2, -0x1.210c4e0000000p-2, -0x1.76aa7ffffffffp-3,
-0x1.9e0345fffffffp-4,
+ -0x1.bd0fc20000000p-6, 0x1.8e7fdffffffffp-5, 0x1.17051a0000001p-3,
0x1.003039fffffffp-2,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.5f382c0000001p-2, -0x1.c33f480000001p-3, -0x1.f8f1d60000002p-4,
-0x1.5f82460000001p-5,
+ 0x1.e576b5fffffffp-6, 0x1.9f2f040000001p-4, 0x1.776017fffffffp-3,
0x1.2f0731fffffffp-2,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+};
+
+static const double grundig_lpc1[448] = {
+ -0x1.fe33e3fffffffp-1, -0x1.fd2bce0000002p-1, -0x1.fc0b47fffffffp-1,
-0x1.fad7340000001p-1,
+ -0x1.f955420000000p-1, -0x1.f7602c0000001p-1, -0x1.f4f8520000000p-1,
-0x1.f225ddfffffffp-1,
+ -0x1.eec499fffffffp-1, -0x1.ea96d80000000p-1, -0x1.e5a15dfffffffp-1,
-0x1.e00fe20000000p-1,
+ -0x1.d96c340000000p-1, -0x1.d1d46e0000000p-1, -0x1.c900540000001p-1,
-0x1.be6e720000001p-1,
+ -0x1.b0674c0000000p-1, -0x1.9d1da20000001p-1, -0x1.8166adfffffffp-1,
-0x1.5f06020000000p-1,
+ -0x1.2fa5680000000p-1, -0x1.f824780000001p-2, -0x1.7dd0bdfffffffp-2,
-0x1.e6704e0000001p-3,
+ -0x1.6245940000000p-4, 0x1.c6b3600000001p-5, 0x1.98fd860000002p-3,
0x1.5fe3de0000000p-2,
+ 0x1.f58e500000001p-2, 0x1.3bf1160000000p-1, 0x1.8317660000000p-1,
0x1.b75ee80000001p-1,
+ -0x1.adbc03fffffffp-1, -0x1.7ef4940000000p-1, -0x1.428fdc0000000p-1,
-0x1.1160ce0000000p-1,
+ -0x1.bb586c0000001p-2, -0x1.60660ffffffffp-2, -0x1.0721380000000p-2,
-0x1.5da9ec0000000p-3,
+ -0x1.78a905fffffffp-4, -0x1.37ef600000001p-6, 0x1.abd243fffffffp-5,
0x1.e4f033fffffffp-4,
+ 0x1.6d455e0000001p-3, 0x1.e5e583ffffffep-3, 0x1.3059120000000p-2,
0x1.6a41ddfffffffp-2,
+ 0x1.a1a15dfffffffp-2, 0x1.d1ba7c0000000p-2, 0x1.00a9420000000p-1,
0x1.17b15a0000000p-1,
+ 0x1.2cc92e0000000p-1, 0x1.41a6760000000p-1, 0x1.54adb00000000p-1,
0x1.6776540000000p-1,
+ 0x1.7936a40000000p-1, 0x1.8a84b00000000p-1, 0x1.9a8d720000000p-1,
0x1.aa8fb9fffffffp-1,
+ 0x1.bb1c680000000p-1, 0x1.c904380000000p-1, 0x1.d69727fffffffp-1,
0x1.e73ab80000000p-1,
+ -0x1.b2ccd80000000p-1, -0x1.7a40860000000p-1, -0x1.473bca0000000p-1,
-0x1.15d36c0000000p-1,
+ -0x1.cfd8c60000000p-2, -0x1.723dadfffffffp-2, -0x1.1b4c320000000p-2,
-0x1.8989b60000002p-3,
+ -0x1.c985d40000000p-4, -0x1.c733640000000p-6, 0x1.df9df60000000p-5,
0x1.3a0d120000000p-3,
+ 0x1.00f64ffffffffp-2, 0x1.6c05720000000p-2, 0x1.d773300000000p-2,
0x1.1fdbec0000000p-1,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.0b9e800000000p-1, -0x1.76369c0000000p-2, -0x1.026c2e0000000p-2,
-0x1.402ef80000000p-3,
+ -0x1.1efb400000000p-4, 0x1.6e5ad40000000p-8, 0x1.38ef380000000p-4,
0x1.26303e0000000p-3,
+ 0x1.a8dc940000000p-3, 0x1.1784760000000p-2, 0x1.592859fffffffp-2,
0x1.9db65c0000000p-2,
+ 0x1.e53cadfffffffp-2, 0x1.1d21580000000p-1, 0x1.49eb520000000p-1,
0x1.8344080000001p-1,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.50d3e60000000p-1, -0x1.0e00b20000000p-1, -0x1.be732e0000000p-2,
-0x1.6bde6c0000000p-2,
+ -0x1.219eb1fffffffp-2, -0x1.baf243fffffffp-3, -0x1.34acd20000000p-3,
-0x1.61e7f80000000p-4,
+ -0x1.5943d80000000p-6, 0x1.5fa2d60000000p-5, 0x1.ba0d460000002p-4,
0x1.6591280000000p-3,
+ 0x1.fbc9b40000001p-3, 0x1.4daa180000000p-2, 0x1.acc45c0000001p-2,
0x1.150dec0000000p-1,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.d5b16c0000001p-2, -0x1.4444da0000001p-2, -0x1.b7a37fffffffep-3,
-0x1.0e74520000000p-3,
+ -0x1.dae0a60000000p-5, 0x1.6c48ee0000003p-7, 0x1.333b200000000p-4,
0x1.161b8c0000000p-3,
+ 0x1.9160b7fffffffp-3, 0x1.05ae860000001p-2, 0x1.44301e0000000p-2,
0x1.86307bfffffffp-2,
+ 0x1.cbccd40000000p-2, 0x1.09921e0000000p-1, 0x1.32a9620000000p-1,
0x1.66a9260000000p-1,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.f8d7ec0000000p-2, -0x1.824ee9ffffffep-2, -0x1.2f0cabfffffffp-2,
-0x1.d23ea7ffffffep-3,
+ -0x1.489fcc0000001p-3, -0x1.a3e7380000003p-4, -0x1.82b8480000000p-5,
0x1.b575800000000p-8,
+ 0x1.df0c5c0000000p-5, 0x1.c1d8000000004p-4, 0x1.4b3277ffffffep-3,
0x1.b51bd80000001p-3,
+ 0x1.1818480000001p-2, 0x1.5ece51fffffffp-2, 0x1.aca1100000001p-2,
0x1.0957740000000p-1,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.ccad4bfffffffp-2, -0x1.33bec80000000p-2, -0x1.b08d040000002p-3,
-0x1.228367fffffffp-3,
+ -0x1.5a2dc40000000p-4, -0x1.0a5ba60000000p-5, 0x1.f2b7adffffffdp-7,
0x1.046bfe0000000p-4,
+ 0x1.c61c3a0000001p-4, 0x1.4636da0000000p-3, 0x1.ac942bfffffffp-3,
0x1.0c23fa0000001p-2,
+ 0x1.455159fffffffp-2, 0x1.8bfde80000000p-2, 0x1.e648b40000000p-2,
0x1.3a14900000000p-1,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.5ad96e0000001p-2, -0x1.b667480000001p-3, -0x1.e1d3a7ffffffcp-4,
-0x1.00391a0000000p-5,
+ 0x1.a3eae00000000p-5, 0x1.1bf95dfffffffp-3, 0x1.e7f4d80000001p-3,
0x1.74e2380000000p-2,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.1b22fe0000000p-2, -0x1.1da4e7fffffffp-3, -0x1.594e49fffffffp-5,
0x1.62ae2e0000000p-5,
+ 0x1.f84de40000005p-4, 0x1.a484380000001p-3, 0x1.3449c40000000p-2,
0x1.ba24940000000p-2,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.85109dfffffffp-2, -0x1.f3158dfffffffp-3, -0x1.1f432a0000000p-3,
-0x1.b169ce0000000p-5,
+ 0x1.e08677fffffffp-6, 0x1.c5a8400000003p-4, 0x1.ad0d7e0000001p-3,
0x1.5c2e480000000p-2,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.71b4620000000p-2, -0x1.ceb98fffffffdp-3, -0x1.f53cf80000000p-4,
-0x1.120f460000001p-5,
+ 0x1.9180cc0000000p-5, 0x1.0c2dda0000000p-3, 0x1.cd9895fffffffp-3,
0x1.66cdf40000000p-2,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.a2e261fffffffp-2, -0x1.210c4e0000000p-2, -0x1.76aa7ffffffffp-3,
-0x1.9e0345fffffffp-4,
+ -0x1.bd0fc20000000p-6, 0x1.8e7fdffffffffp-5, 0x1.17051a0000001p-3,
0x1.003039fffffffp-2,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ -0x1.fe5eb80000000p-3, -0x1.2e71f00000000p-4, 0x1.f33c9e0000001p-5,
0x1.a30cf00000000p-3,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+ 0x0.0p+0, 0x0.0p+0, 0x0.0p+0, 0x0.0p+0,
+};
+
+static const double grundig_pitch_gain[32] = {
+ 0x1.9800000000000p-5, 0x1.ce00000000000p-4, 0x1.6800000000000p-3,
0x1.e800000000000p-3,
+ 0x1.3480000000000p-2, 0x1.7500000000000p-2, 0x1.b580000000000p-2,
0x1.f600000000000p-2,
+ 0x1.1b40000000000p-1, 0x1.3b40000000000p-1, 0x1.5b80000000000p-1,
0x1.7bc0000000000p-1,
+ 0x1.9c00000000000p-1, 0x1.bc40000000000p-1, 0x1.dc40000000000p-1,
0x1.fc80000000000p-1,
+ 0x1.0e60000000000p+0, 0x1.1e80000000000p+0, 0x1.2ea0000000000p+0,
0x1.3ec0000000000p+0,
+ 0x1.4ec0000000000p+0, 0x1.5ee0000000000p+0, 0x1.6f00000000000p+0,
0x1.7f20000000000p+0,
+ 0x1.8f40000000000p+0, 0x1.9f60000000000p+0, 0x1.af60000000000p+0,
0x1.bf80000000000p+0,
+ 0x1.cfa0000000000p+0, 0x1.dfc0000000000p+0, 0x1.efe0000000000p+0,
0x1.0000000000000p+1,
+};
+
+static const double grundig_fcb_lead[64] = {
+ 0x0.0p+0, 0x1.0000000000000p+2, 0x1.0000000000000p+3, 0x1.a000000000000p+3,
+ 0x1.1000000000000p+4, 0x1.6000000000000p+4, 0x1.a000000000000p+4,
0x1.f000000000000p+4,
+ 0x1.1800000000000p+5, 0x1.4000000000000p+5, 0x1.6000000000000p+5,
0x1.8000000000000p+5,
+ 0x1.a800000000000p+5, 0x1.d000000000000p+5, 0x1.f800000000000p+5,
0x1.1400000000000p+6,
+ 0x1.3000000000000p+6, 0x1.4c00000000000p+6, 0x1.6c00000000000p+6,
0x1.8c00000000000p+6,
+ 0x1.b400000000000p+6, 0x1.dc00000000000p+6, 0x1.0400000000000p+7,
0x1.1c00000000000p+7,
+ 0x1.3600000000000p+7, 0x1.5400000000000p+7, 0x1.7200000000000p+7,
0x1.9600000000000p+7,
+ 0x1.bc00000000000p+7, 0x1.e400000000000p+7, 0x1.0900000000000p+8,
0x1.2200000000000p+8,
+ 0x1.3d00000000000p+8, 0x1.5a00000000000p+8, 0x1.7a00000000000p+8,
0x1.9e00000000000p+8,
+ 0x1.c400000000000p+8, 0x1.ee00000000000p+8, 0x1.0e00000000000p+9,
0x1.2780000000000p+9,
+ 0x1.4300000000000p+9, 0x1.6100000000000p+9, 0x1.8180000000000p+9,
0x1.a580000000000p+9,
+ 0x1.cd00000000000p+9, 0x1.f780000000000p+9, 0x1.1340000000000p+10,
0x1.2d00000000000p+10,
+ 0x1.4900000000000p+10, 0x1.6780000000000p+10, 0x1.8900000000000p+10,
0x1.adc0000000000p+10,
+ 0x1.d5c0000000000p+10, 0x1.00a0000000000p+11, 0x1.1880000000000p+11,
0x1.32a0000000000p+11,
+ 0x1.4f40000000000p+11, 0x1.6e60000000000p+11, 0x1.9080000000000p+11,
0x1.b5c0000000000p+11,
+ 0x1.de80000000000p+11, 0x1.0580000000000p+12, 0x1.1de0000000000p+12,
0x1.3880000000000p+12,
+};
+
+static const double grundig_pulse_amp[8] = {
+ -0x1.e738000000000p-1, -0x1.5c04000000000p-1, -0x1.a1a0000000000p-2,
-0x1.1670000000000p-3,
+ 0x1.1670000000000p-3, 0x1.a1a0000000000p-2, 0x1.5c04000000000p-1,
0x1.e738000000000p-1,
+};
+
+static const double grundig_unvoiced_gain[32] = {
+ 0x0.0p+0, 0x1.4000000000000p-13, 0x1.4000000000000p-12,
0x1.e000000000000p-12,
+ 0x1.5000000000000p-11, 0x1.c000000000000p-11, 0x1.1800000000000p-10,
0x1.5000000000000p-10,
+ 0x1.9000000000000p-10, 0x1.d800000000000p-10, 0x1.1400000000000p-9,
0x1.3c00000000000p-9,
+ 0x1.6800000000000p-9, 0x1.9800000000000p-9, 0x1.cc00000000000p-9,
0x1.0200000000000p-8,
+ 0x1.2000000000000p-8, 0x1.4000000000000p-8, 0x1.6400000000000p-8,
0x1.8a00000000000p-8,
+ 0x1.b400000000000p-8, 0x1.e000000000000p-8, 0x1.0800000000000p-7,
0x1.2200000000000p-7,
+ 0x1.3e00000000000p-7, 0x1.5c00000000000p-7, 0x1.7d00000000000p-7,
0x1.a100000000000p-7,
+ 0x1.c700000000000p-7, 0x1.f000000000000p-7, 0x1.0e80000000000p-6,
0x1.2680000000000p-6,
+};
+
+static const int32_t grundig_cum[576] = {
+ 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 uint8_t grundig_widths[GRUNDIG_ORDER] = {
+ 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3,
+};
+
+typedef struct GrundigSPContext {
+ double hist[GRUNDIG_HIST + 1]; /* excitation history; base read index 187
*/
+ double syn[16]; /* lattice b-state (order 14, +slack)
*/
+ double deemph; /* de-emphasis memory
*/
+ uint16_t rnd; /* unvoiced LCG state
*/
+} GrundigSPContext;
+
+static av_cold int grundig_sp_decode_init(AVCodecContext *avctx)
+{
+ GrundigSPContext *p = avctx->priv_data;
+
+ av_channel_layout_uninit(&avctx->ch_layout);
+ avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
+ avctx->sample_fmt = AV_SAMPLE_FMT_S16;
+ if (!avctx->sample_rate)
+ avctx->sample_rate = 12000;
+
+ memset(p, 0, sizeof(*p));
+ return 0;
+}
+
+/* Build a voiced subframe excitation: adaptive (pitch) part + 7 fixed pulses.
*/
+static void grundig_build_voiced(GrundigSPContext *p, double *out, int lag,
+ int gain_idx, uint32_t fixed31,
+ const int *pulse)
+{
+ int i, j, k, sv, col, hi;
+ int64_t row, val;
+ int pos[7];
+ double lead;
+ double g = grundig_pitch_gain[gain_idx];
+
+ /* adaptive codebook: periodic repetition of the excitation history */
+ j = 0; sv = 1;
+ while (j < GRUNDIG_SUBLEN) {
+ hi = sv * lag;
+ while (j < hi && j < GRUNDIG_SUBLEN) {
+ out[j] = p->hist[GRUNDIG_HIST + (j - sv * lag)] * g;
+ j++;
+ }
+ sv++;
+ }
+
+ /* fixed codebook: decode 7 pulse positions from the 31-bit index via the
+ * cumulative binomial table (base-151/.. enumeration). */
+ val = fixed31;
+ if (val > 0x57cddec7)
+ val = 0x57cddec7;
+ col = 0x47; row = 0x1f8;
+ for (k = 0; k < 7; k++) {
+ while (val < (int64_t)grundig_cum[col + row])
+ col--;
+ pos[k] = col;
+ val -= grundig_cum[col + row];
+ row -= 0x48;
+ }
+
+ lead = grundig_fcb_lead[pulse[0]];
+ for (k = 0; k < 7; k++)
+ out[pos[k]] += grundig_pulse_amp[pulse[1 + k]] * lead;
+
+ /* shift history and append this subframe's excitation */
+ for (i = 0; i < 115; i++)
+ p->hist[i] = p->hist[i + 72];
+ for (i = 0; i < 72; i++)
+ p->hist[115 + i] = out[i];
+}
+
+/* Build an unvoiced subframe excitation from the LCG noise generator. */
+static void grundig_build_unvoiced(GrundigSPContext *p, double *out, int
gain_idx)
+{
+ int i, s;
+ double sc = grundig_unvoiced_gain[gain_idx];
+
+ for (i = 0; i < GRUNDIG_SUBLEN; i++) {
+ p->rnd = p->rnd * 0x209 + 0x103;
+ s = p->rnd >= 0x8000 ? (int)p->rnd - 0x10000 : (int)p->rnd;
+ out[i] = s * sc;
+ }
+ for (i = 0; i < 115; i++)
+ p->hist[i] = p->hist[i + 72];
+ for (i = 0; i < 72; i++)
+ p->hist[115 + i] = out[i];
+}
+
+/* Order-14 lattice synthesis filter. */
+static void grundig_lattice(GrundigSPContext *p, double *out,
+ const double *exc, const double *refl)
+{
+ int n, m;
+ double *b = p->syn;
+
+ for (n = 0; n < GRUNDIG_SUBLEN; n++) {
+ double f = exc[n] - refl[GRUNDIG_ORDER - 1] * b[GRUNDIG_ORDER - 1];
+ for (m = GRUNDIG_ORDER - 2; m >= 0; m--) {
+ f = f - refl[m] * b[m];
+ b[m + 1] = refl[m] * f + b[m];
+ }
+ b[0] = f;
+ out[n] = f;
+ }
+}
+
+/* De-emphasis + rounding/clamping to int16. */
+static void grundig_deemph(GrundigSPContext *p, int16_t *out, const double
*synth,
+ int n)
+{
+ int i;
+ double prev = p->deemph;
+
+ for (i = 0; i < n; i++) {
+ double y = synth[i] - prev * GRUNDIG_DEEMPH_POLE;
+ prev = y;
+ if (y <= 32767.5) {
+ if (y >= -32767.5)
+ out[i] = (int16_t)floor(y + 0.5);
+ else
+ out[i] = -32767;
+ } else {
+ out[i] = 32767;
+ }
+ }
+ p->deemph = prev;
+}
+
+static void grundig_decode_one_frame(GrundigSPContext *p, int16_t *out,
+ GetBitContext *gb)
+{
+ int i, sf;
+ int lsf[GRUNDIG_ORDER];
+ double refl[GRUNDIG_ORDER];
+ double synth[GRUNDIG_SAMPLES];
+ int gains[GRUNDIG_SUBFRAMES];
+ uint32_t fixed31[GRUNDIG_SUBFRAMES];
+ int pulses[GRUNDIG_SUBFRAMES][8];
+ int pit[GRUNDIG_SUBFRAMES];
+ int prev_lag;
+ uint32_t v;
+
+ /* 14 reflection-coefficient indices (mode 0: always voiced). */
+ for (i = 0; i < GRUNDIG_ORDER; i++)
+ lsf[i] = get_bits(gb, grundig_widths[i]);
+
+ for (sf = 0; sf < GRUNDIG_SUBFRAMES; sf++) {
+ gains[sf] = get_bits(gb, 5);
+ fixed31[sf] = get_bits_long(gb, 31);
+ pulses[sf][0] = get_bits(gb, 6);
+ for (i = 1; i < 8; i++)
+ pulses[sf][i] = get_bits(gb, 3);
+ }
+
+ /* 24-bit field -> 4 differential pitch lags (base 151 then base 48). */
+ v = get_bits_long(gb, 24);
+ pit[0] = v % 0x97; v /= 0x97;
+ for (i = 1; i < 4; i++) {
+ pit[i] = v % 0x30; v /= 0x30;
+ }
+
+ for (i = 0; i < GRUNDIG_ORDER; i++)
+ refl[i] = grundig_lpc0[lsf[i] + 32 * i];
+
+ prev_lag = 0;
+ for (sf = 0; sf < GRUNDIG_SUBFRAMES; sf++) {
+ double exc[GRUNDIG_SUBLEN];
+ int lag;
+
+ if (sf == 0) {
+ lag = pit[0] + 0x24;
+ } else if (prev_lag < 0xa3) {
+ int base = prev_lag - 0x17;
+ if (base < 0x24)
+ base = 0x24;
+ lag = pit[sf] + base;
+ } else {
+ lag = pit[sf] + 0x8b;
+ }
+ prev_lag = lag;
+
+ grundig_build_voiced(p, exc, lag, gains[sf], fixed31[sf], pulses[sf]);
+ grundig_lattice(p, synth + sf * GRUNDIG_SUBLEN, exc, refl);
+ }
+
+ grundig_deemph(p, out, synth, GRUNDIG_SAMPLES);
+}
+
+static int grundig_sp_decode_frame(AVCodecContext *avctx, AVFrame *frame,
+ int *got_frame_ptr, AVPacket *avpkt)
+{
+ GrundigSPContext *p = avctx->priv_data;
+ GetBitContext gb;
+ int16_t *out;
+ int ret;
+
+ if (avpkt->size < GRUNDIG_FRAME_BYTES) {
+ if (avpkt->size)
+ av_log(avctx, AV_LOG_WARNING,
+ "Expected %d bytes, got %d - skipping packet.\n",
+ GRUNDIG_FRAME_BYTES, avpkt->size);
+ *got_frame_ptr = 0;
+ return AVERROR_INVALIDDATA;
+ }
+
+ if ((ret = init_get_bits8(&gb, avpkt->data, GRUNDIG_FRAME_BYTES)) < 0)
+ return ret;
+
+ frame->nb_samples = GRUNDIG_SAMPLES;
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+ return ret;
+
+ out = (int16_t *)frame->data[0];
+ grundig_decode_one_frame(p, out, &gb);
+
+ *got_frame_ptr = 1;
+ return GRUNDIG_FRAME_BYTES;
+}
+
+const FFCodec ff_grundig_sp_decoder = {
+ .p.name = "grundig_sp",
+ CODEC_LONG_NAME("Grundig DSS-SP (Digta CELP)"),
+ .p.type = AVMEDIA_TYPE_AUDIO,
+ .p.id = AV_CODEC_ID_GRUNDIG_SP,
+ .priv_data_size = sizeof(GrundigSPContext),
+ .init = grundig_sp_decode_init,
+ FF_CODEC_DECODE_CB(grundig_sp_decode_frame),
+ .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
+};
diff --git a/libavformat/dss.c b/libavformat/dss.c
index ce86b32..453009e 100644
--- a/libavformat/dss.c
+++ b/libavformat/dss.c
@@ -19,6 +19,9 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include <limits.h>
+#include <string.h>
+
#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
@@ -39,6 +42,15 @@
#define DSS_ACODEC_DSS_SP 0x0 /* SP mode */
#define DSS_ACODEC_G723_1 0x2 /* LP mode */
+/* Grundig DSS-SP (Digta) variant: magic byte 6, fixed 6 x 512-byte header.
+ * Native CELP codec at 12 kHz, 41-byte (328-bit) frames packed as a
+ * continuous bitstream across 512-byte audio blocks. */
+#define DSS_GRUNDIG_VERSION 6
+#define DSS_GRUNDIG_FRAME_SIZE 41
+#define DSS_GRUNDIG_FRAME_BITS 328
+#define DSS_GRUNDIG_SAMPLE_RATE 12000
+#define DSS_GRUNDIG_SAMPLES_PER_FRAME 288
+
#define DSS_HEAD_OFFSET_COMMENT 0x31e
#define DSS_COMMENT_SIZE 64
@@ -56,12 +68,19 @@ typedef struct DSSDemuxContext {
int packet_size;
int dss_header_size;
+
+ /* Grundig variant: pre-extracted continuous 41-byte frame stream */
+ int grundig;
+ uint8_t *grundig_frames;
+ int grundig_nb_frames;
+ int grundig_pos;
} DSSDemuxContext;
static int dss_probe(const AVProbeData *p)
{
if ( AV_RL32(p->buf) != MKTAG(0x2, 'd', 's', 's')
- && AV_RL32(p->buf) != MKTAG(0x3, 'd', 's', 's'))
+ && AV_RL32(p->buf) != MKTAG(0x3, 'd', 's', 's')
+ && AV_RL32(p->buf) != MKTAG(0x6, 'd', 's', 's'))
return 0;
return AVPROBE_SCORE_MAX;
@@ -112,6 +131,104 @@ static int dss_read_metadata_string(AVFormatContext *s,
unsigned int offset,
return av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
}
+/* Read one bit from a 506-byte block payload that is stored as a sequence of
+ * little-endian 16-bit words, MSB first within each word. */
+static inline int grundig_get_bit(const uint8_t *payload, int payload_size,
+ int bit)
+{
+ int wi = bit >> 4;
+ int sub = bit & 15;
+ int idx = wi * 2;
+ unsigned w;
+
+ if (idx + 1 >= payload_size)
+ return 0;
+ w = (payload[idx + 1] << 8) | payload[idx];
+ return (w >> (15 - sub)) & 1;
+}
+
+/* Extract the continuous 41-byte CELP frame stream from the Grundig audio
+ * blocks. Each 512-byte block starts with a 6-byte header
+ * [b0][b1][b2] ff 00 ff
+ * where b2 = number of frames that start in this block and
+ * (b1<<8|b0)>>4 encodes the bit offset of the first whole frame in the block.
+ * Frames are a continuous 328-bit stream that spans block boundaries; on a
+ * boundary the next block's payload continues at bit 0 (after its 6-byte
+ * header). Each extracted frame is repacked as 41 plain MSB-first bytes for
+ * the decoder. */
+static int grundig_extract_frames(AVFormatContext *s, const uint8_t *audio,
+ int audio_size)
+{
+ DSSDemuxContext *ctx = s->priv_data;
+ int nb_blocks = audio_size / DSS_BLOCK_SIZE;
+ int blockbits = (DSS_BLOCK_SIZE - DSS_AUDIO_BLOCK_HEADER_SIZE) * 8; /*
506*8 */
+ const int payload_size = DSS_BLOCK_SIZE - DSS_AUDIO_BLOCK_HEADER_SIZE;
+ int total_frames = 0;
+ int bi, cap, count;
+ uint8_t *out;
+
+ for (bi = 0; bi < nb_blocks; bi++)
+ total_frames += audio[bi * DSS_BLOCK_SIZE + 2];
+
+ if (total_frames <= 0)
+ return AVERROR_INVALIDDATA;
+
+ out = av_malloc_array(total_frames, DSS_GRUNDIG_FRAME_SIZE);
+ if (!out)
+ return AVERROR(ENOMEM);
+
+ cap = total_frames;
+ count = 0;
+ for (bi = 0; bi < nb_blocks; bi++) {
+ const uint8_t *blk = audio + bi * DSS_BLOCK_SIZE;
+ int w0 = (blk[1] << 8) | blk[0];
+ int f421 = w0 >> 4;
+ int fc = blk[2];
+ int word_off = (f421 >> 4) - 3;
+ int avail = 0x10 - (f421 & 0xf);
+ int pos = word_off * 16 + (16 - avail);
+ int fi;
+
+ for (fi = 0; fi < fc && count < cap; fi++) {
+ uint8_t *dst = out + count * DSS_GRUNDIG_FRAME_SIZE;
+ int need = DSS_GRUNDIG_FRAME_BITS;
+ int p = pos;
+ int cb = bi;
+ int bitn = 0;
+
+ memset(dst, 0, DSS_GRUNDIG_FRAME_SIZE);
+ while (need > 0) {
+ const uint8_t *cpl = audio + cb * DSS_BLOCK_SIZE +
+ DSS_AUDIO_BLOCK_HEADER_SIZE;
+ int take = FFMIN(need, blockbits - p);
+ int k;
+
+ for (k = 0; k < take; k++) {
+ int bit = grundig_get_bit(cpl, payload_size, p + k);
+ if (bit)
+ dst[bitn >> 3] |= 0x80 >> (bitn & 7);
+ bitn++;
+ }
+ need -= take;
+ p += take;
+ if (need > 0) {
+ cb++;
+ if (cb >= nb_blocks)
+ break;
+ p = 0;
+ }
+ }
+ count++;
+ pos = p;
+ }
+ }
+
+ ctx->grundig_frames = out;
+ ctx->grundig_nb_frames = count;
+ ctx->grundig_pos = 0;
+ return 0;
+}
+
static int dss_read_header(AVFormatContext *s)
{
DSSDemuxContext *ctx = s->priv_data;
@@ -141,6 +258,50 @@ static int dss_read_header(AVFormatContext *s)
if (ret)
return ret;
+ if (version == DSS_GRUNDIG_VERSION) {
+ uint8_t *audio;
+ int64_t total_size, audio_size;
+
+ ctx->grundig = 1;
+ st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codecpar->codec_id = AV_CODEC_ID_GRUNDIG_SP;
+ st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
+ st->codecpar->sample_rate = DSS_GRUNDIG_SAMPLE_RATE;
+ avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
+ st->start_time = 0;
+
+ total_size = avio_size(pb);
+ if (total_size < 0)
+ return total_size;
+ if (total_size <= ctx->dss_header_size)
+ return AVERROR_INVALIDDATA;
+ audio_size = total_size - ctx->dss_header_size;
+ audio_size -= audio_size % DSS_BLOCK_SIZE;
+ if (audio_size <= 0 || audio_size > INT_MAX)
+ return AVERROR_INVALIDDATA;
+
+ if ((ret64 = avio_seek(pb, ctx->dss_header_size, SEEK_SET)) < 0)
+ return (int)ret64;
+
+ audio = av_malloc(audio_size);
+ if (!audio)
+ return AVERROR(ENOMEM);
+ ret = avio_read(pb, audio, audio_size);
+ if (ret < audio_size) {
+ av_free(audio);
+ return ret < 0 ? ret : AVERROR_EOF;
+ }
+
+ ret = grundig_extract_frames(s, audio, audio_size);
+ av_free(audio);
+ if (ret < 0)
+ return ret;
+
+ s->bit_rate = 8LL * DSS_GRUNDIG_FRAME_SIZE * st->codecpar->sample_rate
+ / DSS_GRUNDIG_SAMPLES_PER_FRAME;
+ return 0;
+ }
+
avio_seek(pb, DSS_HEAD_OFFSET_ACODEC, SEEK_SET);
ctx->audio_codec = avio_r8(pb);
@@ -308,16 +469,50 @@ static int dss_723_1_read_packet(AVFormatContext *s,
AVPacket *pkt)
return 0;
}
+static int dss_grundig_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ DSSDemuxContext *ctx = s->priv_data;
+ int ret;
+
+ if (ctx->grundig_pos >= ctx->grundig_nb_frames)
+ return AVERROR_EOF;
+
+ if ((ret = av_new_packet(pkt, DSS_GRUNDIG_FRAME_SIZE)) < 0)
+ return ret;
+
+ memcpy(pkt->data,
+ ctx->grundig_frames + ctx->grundig_pos * DSS_GRUNDIG_FRAME_SIZE,
+ DSS_GRUNDIG_FRAME_SIZE);
+
+ pkt->stream_index = 0;
+ pkt->pts = (int64_t)ctx->grundig_pos *
DSS_GRUNDIG_SAMPLES_PER_FRAME;
+ pkt->duration = DSS_GRUNDIG_SAMPLES_PER_FRAME;
+ pkt->flags |= AV_PKT_FLAG_KEY;
+ ctx->grundig_pos++;
+
+ return 0;
+}
+
static int dss_read_packet(AVFormatContext *s, AVPacket *pkt)
{
DSSDemuxContext *ctx = s->priv_data;
- if (ctx->audio_codec == DSS_ACODEC_DSS_SP)
+ if (ctx->grundig)
+ return dss_grundig_read_packet(s, pkt);
+ else if (ctx->audio_codec == DSS_ACODEC_DSS_SP)
return dss_sp_read_packet(s, pkt);
else
return dss_723_1_read_packet(s, pkt);
}
+static int dss_read_close(AVFormatContext *s)
+{
+ DSSDemuxContext *ctx = s->priv_data;
+
+ av_freep(&ctx->grundig_frames);
+ return 0;
+}
+
static int dss_read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
@@ -326,6 +521,17 @@ static int dss_read_seek(AVFormatContext *s, int
stream_index,
uint8_t header[DSS_AUDIO_BLOCK_HEADER_SIZE];
int offset;
+ if (ctx->grundig) {
+ int64_t idx = timestamp / DSS_GRUNDIG_SAMPLES_PER_FRAME;
+
+ if (idx < 0)
+ idx = 0;
+ if (idx > ctx->grundig_nb_frames)
+ idx = ctx->grundig_nb_frames;
+ ctx->grundig_pos = idx;
+ return 0;
+ }
+
if (ctx->audio_codec == DSS_ACODEC_DSS_SP)
seekto = timestamp / 264 * 41 / 506 * 512;
else
@@ -367,5 +573,6 @@ const FFInputFormat ff_dss_demuxer = {
.read_probe = dss_probe,
.read_header = dss_read_header,
.read_packet = dss_read_packet,
+ .read_close = dss_read_close,
.read_seek = dss_read_seek,
};
diff --git a/tests/fate/audio.mak b/tests/fate/audio.mak
index c215789..f06ae49 100644
--- a/tests/fate/audio.mak
+++ b/tests/fate/audio.mak
@@ -37,6 +37,9 @@ fate-dss-lp: CMD = framecrc -i $(TARGET_SAMPLES)/dss/lp.dss
-frames 30 -af aresa
FATE_SAMPLES_AUDIO-$(call FRAMECRC, DSS, DSS_SP) += fate-dss-sp
fate-dss-sp: CMD = framecrc -i $(TARGET_SAMPLES)/dss/sp.dss -frames 30
+FATE_SAMPLES_AUDIO-$(call FRAMECRC, DSS, GRUNDIG_SP) += fate-dss-grundig-sp
+fate-dss-grundig-sp: CMD = framecrc -i $(TARGET_SAMPLES)/dss/grundig-sp.dss
+
FATE_SAMPLES_AUDIO-$(call PCM, DSF, DST, ARESAMPLE_FILTER) += fate-dsf-dst
fate-dsf-dst: CMD = pcm -i $(TARGET_SAMPLES)/dst/dst-64fs44-2ch.dff
fate-dsf-dst: CMP = oneoff
diff --git a/tests/ref/fate/dss-grundig-sp b/tests/ref/fate/dss-grundig-sp
new file mode 100644
index 0000000..c32041f
--- /dev/null
+++ b/tests/ref/fate/dss-grundig-sp
@@ -0,0 +1,156 @@
+#tb 0: 1/12000
+#media_type 0: audio
+#codec_id 0: pcm_s16le
+#sample_rate 0: 12000
+#channel_layout_name 0: mono
+0, 0, 0, 288, 576, 0x17f0cb8a
+0, 288, 288, 288, 576, 0xba469b45
+0, 576, 576, 288, 576, 0x18b8d77e
+0, 864, 864, 288, 576, 0x59bbb482
+0, 1152, 1152, 288, 576, 0x030dc45e
+0, 1440, 1440, 288, 576, 0xb8d8dd6d
+0, 1728, 1728, 288, 576, 0xb94d098b
+0, 2016, 2016, 288, 576, 0xa8970c5a
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--
2.43.0
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