sbcenc: add armv6 and neon asm optimizations

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

libavcodec/arm/Makefile

@@ -42,6 +42,7 @@ OBJS-$(CONFIG_DCA_DECODER)             += arm/synth_filter_init_arm.o
 OBJS-$(CONFIG_HEVC_DECODER)            += arm/hevcdsp_init_arm.o
 OBJS-$(CONFIG_MLP_DECODER)             += arm/mlpdsp_init_arm.o
 OBJS-$(CONFIG_RV40_DECODER)            += arm/rv40dsp_init_arm.o
+OBJS-$(CONFIG_SBC_ENCODER)             += arm/sbcdsp_init_arm.o
 OBJS-$(CONFIG_VORBIS_DECODER)          += arm/vorbisdsp_init_arm.o
 OBJS-$(CONFIG_VP6_DECODER)             += arm/vp6dsp_init_arm.o
 OBJS-$(CONFIG_VP9_DECODER)             += arm/vp9dsp_init_10bpp_arm.o   \
@@ -81,6 +82,7 @@ ARMV6-OBJS-$(CONFIG_VP8DSP)            += arm/vp8_armv6.o               \
 
 # decoders/encoders
 ARMV6-OBJS-$(CONFIG_MLP_DECODER)       += arm/mlpdsp_armv6.o
+ARMV6-OBJS-$(CONFIG_SBC_ENCODER)       += arm/sbcdsp_armv6.o
 
 
 # VFP optimizations
@@ -140,6 +142,7 @@ NEON-OBJS-$(CONFIG_HEVC_DECODER)       += arm/hevcdsp_init_neon.o       \
 NEON-OBJS-$(CONFIG_RV30_DECODER)       += arm/rv34dsp_neon.o
 NEON-OBJS-$(CONFIG_RV40_DECODER)       += arm/rv34dsp_neon.o            \
                                           arm/rv40dsp_neon.o
+NEON-OBJS-$(CONFIG_SBC_ENCODER)        += arm/sbcdsp_neon.o
 NEON-OBJS-$(CONFIG_VORBIS_DECODER)     += arm/vorbisdsp_neon.o
 NEON-OBJS-$(CONFIG_VP6_DECODER)        += arm/vp6dsp_neon.o
 NEON-OBJS-$(CONFIG_VP9_DECODER)        += arm/vp9itxfm_16bpp_neon.o     \

libavcodec/arm/sbcdsp_init_arm.c

+/*
+ * 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 ARMv6 optimization for some basic "building bricks"
+ */
+
+#include "libavutil/cpu.h"
+#include "libavutil/arm/cpu.h"
+#include "libavcodec/sbcdsp.h"
+
+void ff_sbc_analyze_4_armv6(const int16_t *in, int32_t *out, const int16_t *consts);
+void ff_sbc_analyze_8_armv6(const int16_t *in, int32_t *out, const int16_t *consts);
+
+void ff_sbc_analyze_4_neon(const int16_t *in, int32_t *out, const int16_t *consts);
+void ff_sbc_analyze_8_neon(const int16_t *in, int32_t *out, const int16_t *consts);
+void ff_sbc_calc_scalefactors_neon(int32_t sb_sample_f[16][2][8],
+                                   uint32_t scale_factor[2][8],
+                                   int blocks, int channels, int subbands);
+int ff_sbc_calc_scalefactors_j_neon(int32_t sb_sample_f[16][2][8],
+                                    uint32_t scale_factor[2][8],
+                                    int blocks, int subbands);
+int ff_sbc_enc_process_input_4s_neon(int position, const uint8_t *pcm,
+                                     int16_t X[2][SBC_X_BUFFER_SIZE],
+                                     int nsamples, int nchannels);
+int ff_sbc_enc_process_input_8s_neon(int position, const uint8_t *pcm,
+                                     int16_t X[2][SBC_X_BUFFER_SIZE],
+                                     int nsamples, int nchannels);
+
+DECLARE_ALIGNED(SBC_ALIGN, int32_t, ff_sbcdsp_joint_bits_mask)[8] = {
+    8,   4,  2,  1, 128, 64, 32, 16
+};
+
+#if HAVE_BIGENDIAN
+#define PERM(a, b, c, d) {        \
+        (a * 2) + 1, (a * 2) + 0, \
+        (b * 2) + 1, (b * 2) + 0, \
+        (c * 2) + 1, (c * 2) + 0, \
+        (d * 2) + 1, (d * 2) + 0  \
+    }
+#else
+#define PERM(a, b, c, d) {        \
+        (a * 2) + 0, (a * 2) + 1, \
+        (b * 2) + 0, (b * 2) + 1, \
+        (c * 2) + 0, (c * 2) + 1, \
+        (d * 2) + 0, (d * 2) + 1  \
+    }
+#endif
+
+DECLARE_ALIGNED(SBC_ALIGN, uint8_t, ff_sbc_input_perm_4)[2][8] = {
+    PERM(7, 3, 6, 4),
+    PERM(0, 2, 1, 5)
+};
+
+DECLARE_ALIGNED(SBC_ALIGN, uint8_t, ff_sbc_input_perm_8)[4][8] = {
+    PERM(15, 7, 14,  8),
+    PERM(13, 9, 12, 10),
+    PERM(11, 3,  6,  0),
+    PERM( 5, 1,  4,  2)
+};
+
+av_cold void ff_sbcdsp_init_arm(SBCDSPContext *s)
+{
+    int cpu_flags = av_get_cpu_flags();
+
+    if (have_armv6(cpu_flags)) {
+        s->sbc_analyze_4 = ff_sbc_analyze_4_armv6;
+        s->sbc_analyze_8 = ff_sbc_analyze_8_armv6;
+    }
+
+    if (have_neon(cpu_flags)) {
+        s->sbc_analyze_4 = ff_sbc_analyze_4_neon;
+        s->sbc_analyze_8 = ff_sbc_analyze_8_neon;
+        s->sbc_calc_scalefactors = ff_sbc_calc_scalefactors_neon;
+        s->sbc_calc_scalefactors_j = ff_sbc_calc_scalefactors_j_neon;
+        if (s->increment != 1) {
+            s->sbc_enc_process_input_4s = ff_sbc_enc_process_input_4s_neon;
+            s->sbc_enc_process_input_8s = ff_sbc_enc_process_input_8s_neon;
+        }
+    }
+}

libavcodec/sbcdsp.c

@@ -380,6 +380,8 @@ av_cold void ff_sbcdsp_init(SBCDSPContext *s)
     s->sbc_calc_scalefactors = sbc_calc_scalefactors;
     s->sbc_calc_scalefactors_j = sbc_calc_scalefactors_j;
 
+    if (ARCH_ARM)
+        ff_sbcdsp_init_arm(s);
     if (ARCH_X86)
         ff_sbcdsp_init_x86(s);
 }

libavcodec/sbcdsp.h

@@ -80,6 +80,7 @@ struct sbc_dsp_context {
  */
 void ff_sbcdsp_init(SBCDSPContext *s);
 
+void ff_sbcdsp_init_arm(SBCDSPContext *s);
 void ff_sbcdsp_init_x86(SBCDSPContext *s);
 
 #endif /* AVCODEC_SBCDSP_H */