sbc: implement SBC encoder (low-complexity subband codec)

This was originally based on libsbc, and was fully integrated into ffmpeg.

doc/general.texi

@@ -1142,7 +1142,7 @@ following image formats are supported:
     @tab Real low bitrate AC-3 codec
 @item RealAudio Lossless     @tab     @tab  X
 @item RealAudio SIPR / ACELP.NET @tab     @tab  X
-@item SBC (low-complexity subband codec) @tab     @tab  X
+@item SBC (low-complexity subband codec) @tab  X  @tab  X
     @tab Used in Bluetooth A2DP
 @item Shorten                @tab     @tab  X
 @item Sierra VMD audio       @tab     @tab  X

libavcodec/Makefile

@@ -588,6 +588,7 @@ OBJS-$(CONFIG_SUNRAST_DECODER)         += sunrast.o
 OBJS-$(CONFIG_SUNRAST_ENCODER)         += sunrastenc.o
 OBJS-$(CONFIG_LIBRSVG_DECODER)         += librsvgdec.o
 OBJS-$(CONFIG_SBC_DECODER)             += sbcdec.o sbcdec_data.o sbc.o
+OBJS-$(CONFIG_SBC_ENCODER)             += sbcenc.o sbc.o sbcdsp.o sbcdsp_data.o
 OBJS-$(CONFIG_SVQ1_DECODER)            += svq1dec.o svq1.o svq13.o h263data.o
 OBJS-$(CONFIG_SVQ1_ENCODER)            += svq1enc.o svq1.o  h263data.o  \
                                           h263.o ituh263enc.o

libavcodec/allcodecs.c

@@ -453,6 +453,7 @@ extern AVCodec ff_ra_144_encoder;
 extern AVCodec ff_ra_144_decoder;
 extern AVCodec ff_ra_288_decoder;
 extern AVCodec ff_ralf_decoder;
+extern AVCodec ff_sbc_encoder;
 extern AVCodec ff_sbc_decoder;
 extern AVCodec ff_shorten_decoder;
 extern AVCodec ff_sipr_decoder;

libavcodec/avcodec.h

@@ -2926,6 +2926,8 @@ typedef struct AVCodecContext {
 #define FF_PROFILE_MJPEG_HUFFMAN_LOSSLESS                0xc3
 #define FF_PROFILE_MJPEG_JPEG_LS                         0xf7
 
+#define FF_PROFILE_SBC_MSBC                         1
+
     /**
      * level
      * - encoding: Set by user.

libavcodec/options_table.h

@@ -300,6 +300,7 @@ static const AVOption avcodec_options[] = {
 {"mpeg4_main", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_PROFILE_MPEG4_MAIN }, INT_MIN, INT_MAX, V|E, "profile"},
 {"mpeg4_asp",  NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_PROFILE_MPEG4_ADVANCED_SIMPLE }, INT_MIN, INT_MAX, V|E, "profile"},
 {"main10",  NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_PROFILE_HEVC_MAIN_10 }, INT_MIN, INT_MAX, V|E, "profile"},
+{"msbc",  NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_PROFILE_SBC_MSBC }, INT_MIN, INT_MAX, A|E, "profile"},
 {"level", NULL, OFFSET(level), AV_OPT_TYPE_INT, {.i64 = FF_LEVEL_UNKNOWN }, INT_MIN, INT_MAX, V|A|E, "level"},
 {"unknown", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LEVEL_UNKNOWN }, INT_MIN, INT_MAX, V|A|E, "level"},
 {"lowres", "decode at 1= 1/2, 2=1/4, 3=1/8 resolutions", OFFSET(lowres), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, V|A|D},

libavcodec/profiles.c

@@ -140,4 +140,9 @@ const AVProfile ff_vp9_profiles[] = {
     { FF_PROFILE_UNKNOWN },
 };
 
+const AVProfile ff_sbc_profiles[] = {
+    { FF_PROFILE_SBC_MSBC, "mSBC" },
+    { FF_PROFILE_UNKNOWN },
+};
+
 #endif /* !CONFIG_SMALL */

libavcodec/profiles.h

@@ -31,5 +31,6 @@ extern const AVProfile ff_mpeg2_video_profiles[];
 extern const AVProfile ff_mpeg4_video_profiles[];
 extern const AVProfile ff_vc1_profiles[];
 extern const AVProfile ff_vp9_profiles[];
+extern const AVProfile ff_sbc_profiles[];
 
 #endif /* AVCODEC_PROFILES_H */

libavcodec/sbcdsp.h

+/*
+ * Bluetooth low-complexity, subband codec (SBC)
+ *
+ * Copyright (C) 2017  Aurelien Jacobs <aurel@gnuage.org>
+ * Copyright (C) 2008-2010  Nokia Corporation
+ * Copyright (C) 2004-2010  Marcel Holtmann <marcel@holtmann.org>
+ * Copyright (C) 2004-2005  Henryk Ploetz <henryk@ploetzli.ch>
+ * Copyright (C) 2005-2006  Brad Midgley <bmidgley@xmission.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
+ */
+
+/**
+ * @file
+ * SBC basic "building bricks"
+ */
+
+#ifndef AVCODEC_SBCDSP_H
+#define AVCODEC_SBCDSP_H
+
+#include "sbc.h"
+#include "sbcdsp_data.h"
+
+#define SCALE_OUT_BITS 15
+#define SBC_X_BUFFER_SIZE 328
+
+typedef struct sbc_dsp_context SBCDSPContext;
+
+struct sbc_dsp_context {
+    int position;
+    /* Number of consecutive blocks handled by the encoder */
+    uint8_t increment;
+    DECLARE_ALIGNED(SBC_ALIGN, int16_t, X)[2][SBC_X_BUFFER_SIZE];
+    void (*sbc_analyze_4)(const int16_t *in, int32_t *out, const int16_t *consts);
+    void (*sbc_analyze_8)(const int16_t *in, int32_t *out, const int16_t *consts);
+    /* Polyphase analysis filter for 4 subbands configuration,
+     * it handles "increment" blocks at once */
+    void (*sbc_analyze_4s)(SBCDSPContext *s,
+                           int16_t *x, int32_t *out, int out_stride);
+    /* Polyphase analysis filter for 8 subbands configuration,
+     * it handles "increment" blocks at once */
+    void (*sbc_analyze_8s)(SBCDSPContext *s,
+                           int16_t *x, int32_t *out, int out_stride);
+    /* Process input data (deinterleave, endian conversion, reordering),
+     * depending on the number of subbands and input data byte order */
+    int (*sbc_enc_process_input_4s)(int position, const uint8_t *pcm,
+                                    int16_t X[2][SBC_X_BUFFER_SIZE],
+                                    int nsamples, int nchannels);
+    int (*sbc_enc_process_input_8s)(int position, const uint8_t *pcm,
+                                    int16_t X[2][SBC_X_BUFFER_SIZE],
+                                    int nsamples, int nchannels);
+    /* Scale factors calculation */
+    void (*sbc_calc_scalefactors)(int32_t sb_sample_f[16][2][8],
+                                  uint32_t scale_factor[2][8],
+                                  int blocks, int channels, int subbands);
+    /* Scale factors calculation with joint stereo support */
+    int (*sbc_calc_scalefactors_j)(int32_t sb_sample_f[16][2][8],
+                                   uint32_t scale_factor[2][8],
+                                   int blocks, int subbands);
+};
+
+/*
+ * Initialize pointers to the functions which are the basic "building bricks"
+ * of SBC codec. Best implementation is selected based on target CPU
+ * capabilities.
+ */
+void ff_sbcdsp_init(SBCDSPContext *s);
+
+#endif /* AVCODEC_SBCDSP_H */

libavcodec/sbcdsp_data.h

+/*
+ * Bluetooth low-complexity, subband codec (SBC)
+ *
+ * Copyright (C) 2017  Aurelien Jacobs <aurel@gnuage.org>
+ * Copyright (C) 2008-2010  Nokia Corporation
+ * Copyright (C) 2004-2010  Marcel Holtmann <marcel@holtmann.org>
+ * Copyright (C) 2004-2005  Henryk Ploetz <henryk@ploetzli.ch>
+ * Copyright (C) 2005-2006  Brad Midgley <bmidgley@xmission.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
+ */
+
+/**
+ * @file
+ * miscellaneous SBC tables
+ */
+
+#ifndef AVCODEC_SBCDSP_DATA_H
+#define AVCODEC_SBCDSP_DATA_H
+
+#include "sbc.h"
+
+#define SBC_PROTO_FIXED_SCALE      16
+#define SBC_COS_TABLE_FIXED_SCALE  15
+
+/*
+ * Constant tables for the use in SIMD optimized analysis filters
+ * Each table consists of two parts:
+ * 1. reordered "proto" table
+ * 2. reordered "cos" table
+ *
+ * Due to non-symmetrical reordering, separate tables for "even"
+ * and "odd" cases are needed
+ */
+
+extern const int16_t ff_sbcdsp_analysis_consts_fixed4_simd_even[];
+extern const int16_t ff_sbcdsp_analysis_consts_fixed4_simd_odd[];
+extern const int16_t ff_sbcdsp_analysis_consts_fixed8_simd_even[];
+extern const int16_t ff_sbcdsp_analysis_consts_fixed8_simd_odd[];
+
+#endif /* AVCODEC_SBCDSP_DATA_H */