Fundamentally rewrite much of the audio DSP.

Creates a standard buffer passing, local data passing and messaging
system for processing stages. Stages can be moved to their own source
files to reduce clutter and ease assimilation of new ones. dsp.c
becomes dsp_core.c which supports an engine and framework for effects.

Formats and change notifications are passed along with the buffer so
that they arrive at the correct time at each stage in the chain
regardless of the internal delays of a particular one.

Removes restrictions on the number of samples that can be processed at
a time and it pays attention to destination buffer size restrictions
without having to limit input count, which also allows pcmbuf to
remain fuller and safely set its own buffer limits as it sees fit.
There is no longer a need to query input/output counts given a certain
number of input samples; just give it the sizes of the source and
destination buffers.

Works in harmony with stages that are not deterministic in terms of
sample input/output ratio (like both resamplers but most notably
the timestretch). As a result it fixes quirks with timestretch hanging
up with certain settings and it now operates properly throughout its
full settings range.
Change-Id: Ib206ec78f6f6c79259c5af9009fe021d68be9734
Reviewed-on: http://gerrit.rockbox.org/200
Reviewed-by: Michael Sevakis <jethead71@rockbox.org>
Tested-by: Michael Sevakis <jethead71@rockbox.org>

1 files changed, 0 insertions, 1568 deletions

diff --git a/lib/rbcodec/dsp/dsp.c b/lib/rbcodec/dsp/dsp.c
deleted file mode 100644
index de647dc0dd..0000000000
--- a/lib/rbcodec/dsp/dsp.c
+++ /dev/null
@@ -1,1568 +0,0 @@
-/***************************************************************************
- *             __________               __   ___.
- *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
- *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
- *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
- *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
- *                     \/            \/     \/    \/            \/
- * $Id$
- *
- * Copyright (C) 2005 Miika Pekkarinen
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ****************************************************************************/
-#include "config.h"
-#include "system.h"
-#include <sound.h>
-#include "dsp.h"
-#include "dsp-util.h"
-#include "eq.h"
-#include "compressor.h"
-#include "kernel.h"
-#include "settings.h"
-#include "replaygain.h"
-#include "tdspeed.h"
-#include "core_alloc.h"
-#include "fixedpoint.h"
-#include "fracmul.h"
-
-/* Define LOGF_ENABLE to enable logf output in this file */
-/*#define LOGF_ENABLE*/
-#include "logf.h"
-
-/* 16-bit samples are scaled based on these constants. The shift should be
- * no more than 15.
- */
-#define WORD_SHIFT              12
-#define WORD_FRACBITS           27
-
-#define NATIVE_DEPTH            16
-#define SMALL_SAMPLE_BUF_COUNT  128 /* Per channel */
-#define DEFAULT_GAIN            0x01000000
-
-/* enums to index conversion properly with stereo mode and other settings */
-enum
-{
-    SAMPLE_INPUT_LE_NATIVE_I_STEREO  = STEREO_INTERLEAVED,
-    SAMPLE_INPUT_LE_NATIVE_NI_STEREO = STEREO_NONINTERLEAVED,
-    SAMPLE_INPUT_LE_NATIVE_MONO      = STEREO_MONO,
-    SAMPLE_INPUT_GT_NATIVE_I_STEREO  = STEREO_INTERLEAVED + STEREO_NUM_MODES,
-    SAMPLE_INPUT_GT_NATIVE_NI_STEREO = STEREO_NONINTERLEAVED + STEREO_NUM_MODES,
-    SAMPLE_INPUT_GT_NATIVE_MONO      = STEREO_MONO + STEREO_NUM_MODES,
-    SAMPLE_INPUT_GT_NATIVE_1ST_INDEX = STEREO_NUM_MODES
-};
-
-enum
-{
-    SAMPLE_OUTPUT_MONO = 0,
-    SAMPLE_OUTPUT_STEREO,
-    SAMPLE_OUTPUT_DITHERED_MONO,
-    SAMPLE_OUTPUT_DITHERED_STEREO
-};
-
-/* No asm...yet */
-struct dither_data
-{
-    long error[3];  /* 00h */
-    long random;    /* 0ch */
-                    /* 10h */
-};
-
-struct crossfeed_data
-{
-    int32_t gain;           /* 00h - Direct path gain */
-    int32_t coefs[3];       /* 04h - Coefficients for the shelving filter */
-    int32_t history[4];     /* 10h - Format is x[n - 1], y[n - 1] for both channels */
-    int32_t delay[13][2];   /* 20h */
-    int32_t *index;         /* 88h - Current pointer into the delay line */
-                            /* 8ch */
-};
-
-/* Current setup is one lowshelf filters three peaking filters and one
- *  highshelf filter. Varying the number of shelving filters make no sense,
- *  but adding peaking filters is possible.
- */
-struct eq_state
-{
-    char enabled[5];            /* 00h - Flags for active filters */
-    struct eqfilter filters[5]; /* 08h - packing is 4? */
-                                /* 10ch */
-};
-
-/* Include header with defines which functions are implemented in assembly
-   code for the target */
-#include <dsp_asm.h>
-
-/* Typedefs keep things much neater in this case */
-typedef void (*sample_input_fn_type)(int count, const char *src[],
-                                     int32_t *dst[]);
-typedef int (*resample_fn_type)(int count, struct dsp_data *data,
-                                const int32_t *src[], int32_t *dst[]);
-typedef void (*sample_output_fn_type)(int count, struct dsp_data *data,
-                                      const int32_t *src[], int16_t *dst);
-
-/* Single-DSP channel processing in place */
-typedef void (*channels_process_fn_type)(int count, int32_t *buf[]);
-/* DSP local channel processing in place */
-typedef void (*channels_process_dsp_fn_type)(int count, struct dsp_data *data,
-                                             int32_t *buf[]);
-
-/*
- ***************************************************************************/
-
-struct dsp_config
-{
-    struct dsp_data data; /* Config members for use in external routines */
-    long codec_frequency; /* Sample rate of data coming from the codec */
-    long frequency;       /* Effective sample rate after pitch shift (if any) */
-    int  sample_depth;
-    int  sample_bytes;
-    int  stereo_mode;
-    int32_t  tdspeed_percent; /* Speed% * PITCH_SPEED_PRECISION */
-#ifdef HAVE_PITCHSCREEN
-    bool tdspeed_active;  /* Timestretch is in use */
-#endif
-#ifdef HAVE_SW_TONE_CONTROLS
-    /* Filter struct for software bass/treble controls */
-    struct eqfilter tone_filter;
-#endif
-    /* Functions that change depending upon settings - NULL if stage is
-       disabled */
-    sample_input_fn_type         input_samples;
-    resample_fn_type             resample;
-    sample_output_fn_type        output_samples;
-    /* These will be NULL for the voice codec and is more economical that
-       way */
-    channels_process_dsp_fn_type apply_gain;
-    channels_process_fn_type     apply_crossfeed;
-    channels_process_fn_type     eq_process;
-    channels_process_fn_type     channels_process;
-    channels_process_dsp_fn_type compressor_process;
-};
-
-/* General DSP config */
-static struct dsp_config dsp_conf[2] IBSS_ATTR;     /* 0=A, 1=V */
-/* Dithering */
-static struct dither_data dither_data[2] IBSS_ATTR; /* 0=left, 1=right */
-static long   dither_mask IBSS_ATTR;
-static long   dither_bias IBSS_ATTR;
-/* Crossfeed */
-struct crossfeed_data crossfeed_data IDATA_ATTR =    /* A */
-{
-    .index = (int32_t *)crossfeed_data.delay
-};
-
-/* Equalizer */
-static struct eq_state eq_data;                     /* A */
-
-/* Software tone controls */
-#ifdef HAVE_SW_TONE_CONTROLS
-static int prescale;                                /* A/V */
-static int bass;                                    /* A/V */
-static int treble;                                  /* A/V */
-#endif
-
-/* Settings applicable to audio codec only */
-#ifdef HAVE_PITCHSCREEN
-static int32_t  pitch_ratio = PITCH_SPEED_100;
-static int  big_sample_locks;
-#endif
-static int  channels_mode;
-       long dsp_sw_gain;
-       long dsp_sw_cross;
-static bool dither_enabled;
-static long eq_precut;
-static long track_gain;
-static bool new_gain;
-static long album_gain;
-static long track_peak;
-static long album_peak;
-static long replaygain;
-static bool crossfeed_enabled;
-
-#define AUDIO_DSP (dsp_conf[CODEC_IDX_AUDIO])
-#define VOICE_DSP (dsp_conf[CODEC_IDX_VOICE])
-
-/* The internal format is 32-bit samples, non-interleaved, stereo. This
- * format is similar to the raw output from several codecs, so the amount
- * of copying needed is minimized for that case.
- */
-
-#define RESAMPLE_RATIO              4 /* Enough for 11,025 Hz -> 44,100 Hz */
-#define SMALL_RESAMPLE_BUF_COUNT    (SMALL_SAMPLE_BUF_COUNT * RESAMPLE_RATIO)
-#define BIG_SAMPLE_BUF_COUNT        SMALL_RESAMPLE_BUF_COUNT
-#define BIG_RESAMPLE_BUF_COUNT      (BIG_SAMPLE_BUF_COUNT * RESAMPLE_RATIO)
-
-static int32_t small_sample_buf[2][SMALL_SAMPLE_BUF_COUNT] IBSS_ATTR;
-static int32_t small_resample_buf[2][SMALL_RESAMPLE_BUF_COUNT] IBSS_ATTR;
-
-#ifdef HAVE_PITCHSCREEN
-static int32_t (* big_sample_buf)[BIG_SAMPLE_BUF_COUNT] = NULL;
-static int32_t (* big_resample_buf)[BIG_RESAMPLE_BUF_COUNT] = NULL;
-#endif
-
-static int sample_buf_count = SMALL_SAMPLE_BUF_COUNT;
-static int32_t *sample_buf[2] = { small_sample_buf[0], small_sample_buf[1] };
-static int resample_buf_count = SMALL_RESAMPLE_BUF_COUNT;
-static int32_t *resample_buf[2] = { small_resample_buf[0], small_resample_buf[1] };
-
-#ifdef HAVE_PITCHSCREEN
-int32_t sound_get_pitch(void)
-{
-    return pitch_ratio;
-}
-
-void sound_set_pitch(int32_t percent)
-{
-    pitch_ratio = percent;
-    dsp_configure(&AUDIO_DSP, DSP_SWITCH_FREQUENCY,
-                  AUDIO_DSP.codec_frequency);
-}
-
-static void tdspeed_set_pointers( bool time_stretch_active )
-{
-    if( time_stretch_active )
-    {
-        sample_buf_count = BIG_SAMPLE_BUF_COUNT;
-        resample_buf_count = BIG_RESAMPLE_BUF_COUNT;
-        sample_buf[0] = big_sample_buf[0];
-        sample_buf[1] = big_sample_buf[1];
-        resample_buf[0] = big_resample_buf[0];
-        resample_buf[1] = big_resample_buf[1];
-    }
-    else
-    {
-        sample_buf_count = SMALL_SAMPLE_BUF_COUNT;
-        resample_buf_count = SMALL_RESAMPLE_BUF_COUNT;
-        sample_buf[0] = small_sample_buf[0];
-        sample_buf[1] = small_sample_buf[1];
-        resample_buf[0] = small_resample_buf[0];
-        resample_buf[1] = small_resample_buf[1];
-    }
-}
- 
-static void tdspeed_setup(struct dsp_config *dspc)
-{
-    /* Assume timestretch will not be used */
-    dspc->tdspeed_active = false;
-
-    tdspeed_set_pointers( false );
-
-    if (!dsp_timestretch_available())
-        return; /* Timestretch not enabled or buffer not allocated */
-
-    if (dspc->tdspeed_percent == 0)
-        dspc->tdspeed_percent = PITCH_SPEED_100;
-
-    if (!tdspeed_config(
-        dspc->codec_frequency == 0 ? NATIVE_FREQUENCY : dspc->codec_frequency,
-        dspc->stereo_mode != STEREO_MONO,
-        dspc->tdspeed_percent))
-        return; /* Timestretch not possible or needed with these parameters */
-
-    /* Timestretch is to be used */
-    dspc->tdspeed_active = true;
-
-    tdspeed_set_pointers( true );
-}
-
-
-static int move_callback(int handle, void* current, void* new)
-{
-    (void)handle;(void)current;
-
-    if ( big_sample_locks > 0 )
-        return BUFLIB_CB_CANNOT_MOVE;
-    
-    big_sample_buf = new;
-    
-    /* no allocation without timestretch enabled */
-    tdspeed_set_pointers( true );
-    return BUFLIB_CB_OK;
-}
-
-static void lock_sample_buf( bool lock )
-{
-    if ( lock )
-        big_sample_locks++;
-    else
-        big_sample_locks--;
-}
-
-static struct buflib_callbacks ops = {
-    .move_callback = move_callback,
-    .shrink_callback = NULL,
-};
-
-
-void dsp_timestretch_enable(bool enabled)
-{
-    /* Hook to set up timestretch buffer on first call to settings_apply() */
-    static int handle = -1;
-    if (enabled)
-    {
-        if (big_sample_buf)
-            return; /* already allocated and enabled */
-
-        /* Set up timestretch buffers */
-        big_sample_buf = &small_resample_buf[0];
-        handle = core_alloc_ex("resample buf",
-                               2 * BIG_RESAMPLE_BUF_COUNT * sizeof(int32_t),
-                               &ops);
-        big_sample_locks = 0;
-        enabled = handle >= 0;
-
-        if (enabled)
-        {
-            /* success, now setup tdspeed */
-            big_resample_buf = core_get_data(handle);
-
-            tdspeed_init();
-            tdspeed_setup(&AUDIO_DSP);
-        }
-    }
-
-    if (!enabled)
-    {
-        dsp_set_timestretch(PITCH_SPEED_100);
-        tdspeed_finish();
-
-        if (handle >= 0)
-            core_free(handle);
-
-        handle = -1;
-        big_sample_buf = NULL;
-    }
-}
-
-void dsp_set_timestretch(int32_t percent)
-{
-    AUDIO_DSP.tdspeed_percent = percent;
-    tdspeed_setup(&AUDIO_DSP);
-}
-
-int32_t dsp_get_timestretch()
-{
-    return AUDIO_DSP.tdspeed_percent;
-}
-
-bool dsp_timestretch_available()
-{
-    return (global_settings.timestretch_enabled && big_sample_buf);
-}
-#endif /* HAVE_PITCHSCREEN */
-
-/* Convert count samples to the internal format, if needed.  Updates src
- * to point past the samples "consumed" and dst is set to point to the
- * samples to consume. Note that for mono, dst[0] equals dst[1], as there
- * is no point in processing the same data twice.
- */
-
-/* convert count 16-bit mono to 32-bit mono */
-static void sample_input_lte_native_mono(
-    int count, const char *src[], int32_t *dst[])
-{
-    const int16_t *s = (int16_t *) src[0];
-    const int16_t * const send = s + count;
-    int32_t *d = dst[0] = dst[1] = sample_buf[0];
-    int scale = WORD_SHIFT;
-
-    while (s < send)
-    {
-        *d++ = *s++ << scale;
-    }
-
-    src[0] = (char *)s;
-}
-
-/* convert count 16-bit interleaved stereo to 32-bit noninterleaved */
-static void sample_input_lte_native_i_stereo(
-    int count, const char *src[], int32_t *dst[])
-{
-    const int32_t *s = (int32_t *) src[0];
-    const int32_t * const send = s + count;
-    int32_t *dl = dst[0] = sample_buf[0];
-    int32_t *dr = dst[1] = sample_buf[1];
-    int scale = WORD_SHIFT;
-
-    while (s < send)
-    {
-        int32_t slr = *s++;
-#ifdef ROCKBOX_LITTLE_ENDIAN
-        *dl++ = (slr >> 16) << scale;
-        *dr++ = (int32_t)(int16_t)slr << scale;
-#else  /* ROCKBOX_BIG_ENDIAN */
-        *dl++ = (int32_t)(int16_t)slr << scale;
-        *dr++ = (slr >> 16) << scale;
-#endif
-    }
-
-    src[0] = (char *)s;
-}
-
-/* convert count 16-bit noninterleaved stereo to 32-bit noninterleaved */
-static void sample_input_lte_native_ni_stereo(
-    int count, const char *src[], int32_t *dst[])
-{
-    const int16_t *sl = (int16_t *) src[0];
-    const int16_t *sr = (int16_t *) src[1];
-    const int16_t * const slend = sl + count;
-    int32_t *dl = dst[0] = sample_buf[0];
-    int32_t *dr = dst[1] = sample_buf[1];
-    int scale = WORD_SHIFT;
-
-    while (sl < slend)
-    {
-        *dl++ = *sl++ << scale;
-        *dr++ = *sr++ << scale;
-    }
-
-    src[0] = (char *)sl;
-    src[1] = (char *)sr;
-}
-
-/* convert count 32-bit mono to 32-bit mono */
-static void sample_input_gt_native_mono(
-    int count, const char *src[], int32_t *dst[])
-{
-    dst[0] = dst[1] = (int32_t *)src[0];
-    src[0] = (char *)(dst[0] + count);
-}
-
-/* convert count 32-bit interleaved stereo to 32-bit noninterleaved stereo */
-static void sample_input_gt_native_i_stereo(
-    int count, const char *src[], int32_t *dst[])
-{
-    const int32_t *s = (int32_t *)src[0];
-    const int32_t * const send = s + 2*count;
-    int32_t *dl = dst[0] = sample_buf[0];
-    int32_t *dr = dst[1] = sample_buf[1];
-
-    while (s < send)
-    {
-        *dl++ = *s++;
-        *dr++ = *s++;
-    }
-
-    src[0] = (char *)send;
-}
-
-/* convert 32 bit-noninterleaved stereo to 32-bit noninterleaved stereo */
-static void sample_input_gt_native_ni_stereo(
-    int count, const char *src[], int32_t *dst[])
-{
-    dst[0] = (int32_t *)src[0];
-    dst[1] = (int32_t *)src[1];
-    src[0] = (char *)(dst[0] + count);
-    src[1] = (char *)(dst[1] + count);
-}
-
-/**
- * sample_input_new_format()
- *
- * set the to-native sample conversion function based on dsp sample parameters
- *
- * !DSPPARAMSYNC
- * needs syncing with changes to the following dsp parameters:
- *  * dsp->stereo_mode (A/V)
- *  * dsp->sample_depth (A/V)
- */
-static void sample_input_new_format(struct dsp_config *dsp)
-{
-    static const sample_input_fn_type sample_input_functions[] =
-    {
-        [SAMPLE_INPUT_LE_NATIVE_I_STEREO]  = sample_input_lte_native_i_stereo,
-        [SAMPLE_INPUT_LE_NATIVE_NI_STEREO] = sample_input_lte_native_ni_stereo,
-        [SAMPLE_INPUT_LE_NATIVE_MONO]      = sample_input_lte_native_mono,
-        [SAMPLE_INPUT_GT_NATIVE_I_STEREO]  = sample_input_gt_native_i_stereo,
-        [SAMPLE_INPUT_GT_NATIVE_NI_STEREO] = sample_input_gt_native_ni_stereo,
-        [SAMPLE_INPUT_GT_NATIVE_MONO]      = sample_input_gt_native_mono,
-    };
-
-    int convert = dsp->stereo_mode;
-
-    if (dsp->sample_depth > NATIVE_DEPTH)
-        convert += SAMPLE_INPUT_GT_NATIVE_1ST_INDEX;
-
-    dsp->input_samples = sample_input_functions[convert];
-}
-
-
-#ifndef DSP_HAVE_ASM_SAMPLE_OUTPUT_MONO
-/* write mono internal format to output format */
-static void sample_output_mono(int count, struct dsp_data *data,
-                               const int32_t *src[], int16_t *dst)
-{
-    const int32_t *s0 = src[0];
-    const int scale = data->output_scale;
-    const int dc_bias = 1 << (scale - 1);
-
-    while (count-- > 0)
-    {
-        int32_t lr = clip_sample_16((*s0++ + dc_bias) >> scale);
-        *dst++ = lr;
-        *dst++ = lr;
-    }
-}
-#endif /* DSP_HAVE_ASM_SAMPLE_OUTPUT_MONO */
-
-/* write stereo internal format to output format */
-#ifndef DSP_HAVE_ASM_SAMPLE_OUTPUT_STEREO
-static void sample_output_stereo(int count, struct dsp_data *data,
-                                 const int32_t *src[], int16_t *dst)
-{
-    const int32_t *s0 = src[0];
-    const int32_t *s1 = src[1];
-    const int scale = data->output_scale;
-    const int dc_bias = 1 << (scale - 1);
-
-    while (count-- > 0)
-    {
-        *dst++ = clip_sample_16((*s0++ + dc_bias) >> scale);
-        *dst++ = clip_sample_16((*s1++ + dc_bias) >> scale);
-    }
-}
-#endif /* DSP_HAVE_ASM_SAMPLE_OUTPUT_STEREO */
-
-/**
- * The "dither" code to convert the 24-bit samples produced by libmad was
- * taken from the coolplayer project - coolplayer.sourceforge.net
- *
- * This function handles mono and stereo outputs.
- */
-static void sample_output_dithered(int count, struct dsp_data *data,
-                                   const int32_t *src[], int16_t *dst)
-{
-    const int32_t mask = dither_mask;
-    const int32_t bias = dither_bias;
-    const int scale = data->output_scale;
-    const int32_t min = data->clip_min;
-    const int32_t max = data->clip_max;
-    const int32_t range = max - min;
-    int ch;
-    int16_t *d;
-
-    for (ch = 0; ch < data->num_channels; ch++)
-    {
-        struct dither_data * const dither = &dither_data[ch];
-        const int32_t *s = src[ch];
-        int i;
-
-        for (i = 0, d = &dst[ch]; i < count; i++, s++, d += 2)
-        {
-            int32_t output, sample;
-            int32_t random;
-
-            /* Noise shape and bias (for correct rounding later) */
-            sample = *s;
-            sample += dither->error[0] - dither->error[1] + dither->error[2];
-            dither->error[2] = dither->error[1];
-            dither->error[1] = dither->error[0]/2;
-
-            output = sample + bias;
-
-            /* Dither, highpass triangle PDF */
-            random = dither->random*0x0019660dL + 0x3c6ef35fL;
-            output += (random & mask) - (dither->random & mask);
-            dither->random = random;
-
-            /* Round sample to output range */
-            output &= ~mask;
-
-            /* Error feedback */
-            dither->error[0] = sample - output;
-
-            /* Clip */
-            if ((uint32_t)(output - min) > (uint32_t)range)
-            {
-                int32_t c = min;
-                if (output > min)
-                    c += range;
-                output = c;
-            }
-
-            /* Quantize and store */
-            *d = output >> scale;
-        }
-    }
-
-    if (data->num_channels == 2)
-        return;
-
-    /* Have to duplicate left samples into the right channel since
-       pcm buffer and hardware is interleaved stereo */
-    d = &dst[0];
-
-    while (count-- > 0)
-    {
-        int16_t s = *d++;
-        *d++ = s;
-    }
-}
-
-/**
- * sample_output_new_format()
- *
- * set the from-native to ouput sample conversion routine
- *
- * !DSPPARAMSYNC
- * needs syncing with changes to the following dsp parameters:
- *  * dsp->stereo_mode (A/V)
- *  * dither_enabled (A)
- */
-static void sample_output_new_format(struct dsp_config *dsp)
-{
-    static const sample_output_fn_type sample_output_functions[] =
-    {
-        sample_output_mono,
-        sample_output_stereo,
-        sample_output_dithered,
-        sample_output_dithered
-    };
-
-    int out = dsp->data.num_channels - 1;
-
-    if (dsp == &AUDIO_DSP && dither_enabled)
-        out += 2;
-
-    dsp->output_samples = sample_output_functions[out];
-}
-
-/**
- * Linear interpolation resampling that introduces a one sample delay because
- * of our inability to look into the future at the end of a frame.
- */
-#ifndef DSP_HAVE_ASM_RESAMPLING
-static int dsp_downsample(int count, struct dsp_data *data,
-                          const int32_t *src[], int32_t *dst[])
-{
-    int ch = data->num_channels - 1;
-    uint32_t delta = data->resample_data.delta;
-    uint32_t phase, pos;
-    int32_t *d;
-
-    /* Rolled channel loop actually showed slightly faster. */
-    do
-    {
-        /* Just initialize things and not worry too much about the relatively
-         * uncommon case of not being able to spit out a sample for the frame.
-         */
-        const int32_t *s = src[ch];
-        int32_t last = data->resample_data.last_sample[ch];
-
-        data->resample_data.last_sample[ch] = s[count - 1];
-        d = dst[ch];
-        phase = data->resample_data.phase;
-        pos = phase >> 16;
-
-        /* Do we need last sample of previous frame for interpolation? */
-        if (pos > 0)
-            last = s[pos - 1];
-
-        while (pos < (uint32_t)count)
-        {
-            *d++ = last + FRACMUL((phase & 0xffff) << 15, s[pos] - last);
-            phase += delta;
-            pos = phase >> 16;
-            last = s[pos - 1];
-        }
-    }
-    while (--ch >= 0);
-
-    /* Wrap phase accumulator back to start of next frame. */
-    data->resample_data.phase = phase - (count << 16);
-    return d - dst[0];
-}
-
-static int dsp_upsample(int count, struct dsp_data *data,
-                        const int32_t *src[], int32_t *dst[])
-{
-    int  ch = data->num_channels - 1;
-    uint32_t delta = data->resample_data.delta;
-    uint32_t phase, pos;
-    int32_t *d;
-
-    /* Rolled channel loop actually showed slightly faster. */
-    do
-    {
-        /* Should always be able to output a sample for a ratio up to RESAMPLE_RATIO */
-        const int32_t *s = src[ch];
-        int32_t last = data->resample_data.last_sample[ch];
-
-        data->resample_data.last_sample[ch] = s[count - 1];
-        d = dst[ch];
-        phase = data->resample_data.phase;
-        pos = phase >> 16;
-
-        while (pos == 0)
-        {
-            *d++ = last + FRACMUL((phase & 0xffff) << 15, s[0] - last);
-            phase += delta;
-            pos = phase >> 16;
-        }
-
-        while (pos < (uint32_t)count)
-        {
-            last = s[pos - 1];
-            *d++ = last + FRACMUL((phase & 0xffff) << 15, s[pos] - last);
-            phase += delta;
-            pos = phase >> 16;
-        }
-    }
-    while (--ch >= 0);
-
-    /* Wrap phase accumulator back to start of next frame. */
-    data->resample_data.phase = phase & 0xffff;
-    return d - dst[0];
-}
-#endif /* DSP_HAVE_ASM_RESAMPLING */
-
-static void resampler_new_delta(struct dsp_config *dsp)
-{
-    dsp->data.resample_data.delta = (unsigned long)
-        dsp->frequency * 65536LL / NATIVE_FREQUENCY;
-
-    if (dsp->frequency == NATIVE_FREQUENCY)
-    {
-        /* NOTE: If fully glitch-free transistions from no resampling to
-           resampling are desired, last_sample history should be maintained
-           even when not resampling. */
-        dsp->resample = NULL;
-        dsp->data.resample_data.phase = 0;
-        dsp->data.resample_data.last_sample[0] = 0;
-        dsp->data.resample_data.last_sample[1] = 0;
-    }
-    else if (dsp->frequency < NATIVE_FREQUENCY)
-        dsp->resample = dsp_upsample;
-    else
-        dsp->resample = dsp_downsample;
-}
-
-/* Resample count stereo samples. Updates the src array, if resampling is
- * done, to refer to the resampled data. Returns number of stereo samples
- * for further processing.
- */
-static inline int resample(struct dsp_config *dsp, int count, int32_t *src[])
-{
-    int32_t *dst[2] =
-    {
-        resample_buf[0],
-        resample_buf[1]
-    };
-    lock_sample_buf( true );
-    count = dsp->resample(count, &dsp->data, (const int32_t **)src, dst);
-
-    src[0] = dst[0];
-    src[1] = dst[dsp->data.num_channels - 1];
-    lock_sample_buf( false );
-    return count;
-}
-
-static void dither_init(struct dsp_config *dsp)
-{
-    memset(dither_data, 0, sizeof (dither_data));
-    dither_bias = (1L << (dsp->data.frac_bits - NATIVE_DEPTH));
-    dither_mask = (1L << (dsp->data.frac_bits + 1 - NATIVE_DEPTH)) - 1;
-}
-
-void dsp_dither_enable(bool enable)
-{
-    struct dsp_config *dsp = &AUDIO_DSP;
-    dither_enabled = enable;
-    sample_output_new_format(dsp);
-}
-
-/* Applies crossfeed to the stereo signal in src.
- * Crossfeed is a process where listening over speakers is simulated. This
- * is good for old hard panned stereo records, which might be quite fatiguing
- * to listen to on headphones with no crossfeed.
- */
-#ifndef DSP_HAVE_ASM_CROSSFEED
-static void apply_crossfeed(int count, int32_t *buf[])
-{
-    int32_t *hist_l = &crossfeed_data.history[0];
-    int32_t *hist_r = &crossfeed_data.history[2];
-    int32_t *delay = &crossfeed_data.delay[0][0];
-    int32_t *coefs = &crossfeed_data.coefs[0];
-    int32_t gain = crossfeed_data.gain;
-    int32_t *di = crossfeed_data.index;
-
-    int32_t acc;
-    int32_t left, right;
-    int i;
-
-    for (i = 0; i < count; i++)
-    {
-        left = buf[0][i];
-        right = buf[1][i];
-
-        /* Filter delayed sample from left speaker */
-        acc = FRACMUL(*di, coefs[0]);
-        acc += FRACMUL(hist_l[0], coefs[1]);
-        acc += FRACMUL(hist_l[1], coefs[2]);
-        /* Save filter history for left speaker */
-        hist_l[1] = acc;
-        hist_l[0] = *di;
-        *di++ = left;
-        /* Filter delayed sample from right speaker */
-        acc = FRACMUL(*di, coefs[0]);
-        acc += FRACMUL(hist_r[0], coefs[1]);
-        acc += FRACMUL(hist_r[1], coefs[2]);
-        /* Save filter history for right speaker */
-        hist_r[1] = acc;
-        hist_r[0] = *di;
-        *di++ = right;
-        /* Now add the attenuated direct sound and write to outputs */
-        buf[0][i] = FRACMUL(left, gain) + hist_r[1];
-        buf[1][i] = FRACMUL(right, gain) + hist_l[1];
-
-        /* Wrap delay line index if bigger than delay line size */
-        if (di >= delay + 13*2)
-            di = delay;
-    }
-    /* Write back local copies of data we've modified */
-    crossfeed_data.index = di;
-}
-#endif /* DSP_HAVE_ASM_CROSSFEED */
-
-/**
- * dsp_set_crossfeed(bool enable)
- *
- * !DSPPARAMSYNC
- * needs syncing with changes to the following dsp parameters:
- *  * dsp->stereo_mode (A)
- */
-void dsp_set_crossfeed(bool enable)
-{
-    crossfeed_enabled = enable;
-    AUDIO_DSP.apply_crossfeed = (enable && AUDIO_DSP.data.num_channels > 1)
-                                    ? apply_crossfeed : NULL;
-}
-
-void dsp_set_crossfeed_direct_gain(int gain)
-{
-    crossfeed_data.gain = get_replaygain_int(gain * 10) << 7;
-    /* If gain is negative, the calculation overflowed and we need to clamp */
-    if (crossfeed_data.gain < 0)
-        crossfeed_data.gain = 0x7fffffff;
-}
-
-/* Both gains should be below 0 dB */
-void dsp_set_crossfeed_cross_params(long lf_gain, long hf_gain, long cutoff)
-{
-    int32_t *c = crossfeed_data.coefs;
-    long scaler = get_replaygain_int(lf_gain * 10) << 7;
-
-    cutoff = 0xffffffff/NATIVE_FREQUENCY*cutoff;
-    hf_gain -= lf_gain;
-    /* Divide cutoff by sqrt(10^(hf_gain/20)) to place cutoff at the -3 dB
-     * point instead of shelf midpoint. This is for compatibility with the old
-     * crossfeed shelf filter and should be removed if crossfeed settings are
-     * ever made incompatible for any other good reason.
-     */
-    cutoff = fp_div(cutoff, get_replaygain_int(hf_gain*5), 24);
-    filter_shelf_coefs(cutoff, hf_gain, false, c);
-    /* Scale coefs by LF gain and shift them to s0.31 format. We have no gains
-     * over 1 and can do this safely
-     */
-    c[0] = FRACMUL_SHL(c[0], scaler, 4);
-    c[1] = FRACMUL_SHL(c[1], scaler, 4);
-    c[2] <<= 4;
-}
-
-/* Apply a constant gain to the samples (e.g., for ReplayGain).
- * Note that this must be called before the resampler.
- */
-#ifndef DSP_HAVE_ASM_APPLY_GAIN
-static void dsp_apply_gain(int count, struct dsp_data *data, int32_t *buf[])
-{
-    const int32_t gain = data->gain;
-    int ch;
-
-    for (ch = 0; ch < data->num_channels; ch++)
-    {
-        int32_t *d = buf[ch];
-        int i;
-
-        for (i = 0; i < count; i++)
-            d[i] = FRACMUL_SHL(d[i], gain, 8);
-    }
-}
-#endif /* DSP_HAVE_ASM_APPLY_GAIN */
-
-/* Combine all gains to a global gain. */
-static void set_gain(struct dsp_config *dsp)
-{
-    /* gains are in S7.24 format */
-    dsp->data.gain = DEFAULT_GAIN;
-
-    /* Replay gain not relevant to voice */
-    if (dsp == &AUDIO_DSP && replaygain)
-    {
-        dsp->data.gain = replaygain;
-    }
-
-    if (dsp->eq_process && eq_precut)
-    {
-        dsp->data.gain = fp_mul(dsp->data.gain, eq_precut, 24);
-    }
-
-#ifdef HAVE_SW_VOLUME_CONTROL
-    if (global_settings.volume < SW_VOLUME_MAX ||
-        global_settings.volume > SW_VOLUME_MIN)
-    {
-        int vol_gain = get_replaygain_int(global_settings.volume * 100);
-        dsp->data.gain = (long) (((int64_t) dsp->data.gain * vol_gain) >> 24);
-    }
-#endif
-
-    if (dsp->data.gain == DEFAULT_GAIN)
-    {
-        dsp->data.gain = 0;
-    }
-    else
-    {
-        dsp->data.gain >>= 1;   /* convert gain to S8.23 format */
-    }
-
-    dsp->apply_gain = dsp->data.gain != 0 ? dsp_apply_gain : NULL;
-}
-
-/**
- * Update the amount to cut the audio before applying the equalizer.
- *
- * @param precut to apply in decibels (multiplied by 10)
- */
-void dsp_set_eq_precut(int precut)
-{
-    eq_precut = get_replaygain_int(precut * -10);
-    set_gain(&AUDIO_DSP);
-}
-
-/**
- * Synchronize the equalizer filter coefficients with the global settings.
- *
- * @param band the equalizer band to synchronize
- */
-void dsp_set_eq_coefs(int band, int cutoff, int q, int gain)
-{
-    /* Convert user settings to format required by coef generator functions */
-    cutoff = 0xffffffff / NATIVE_FREQUENCY * cutoff;
-
-    if (q == 0)
-        q = 1;
-
-    /* NOTE: The coef functions assume the EMAC unit is in fractional mode,
-       which it should be, since we're executed from the main thread. */
-
-    /* Assume a band is disabled if the gain is zero */
-    if (gain == 0)
-    {
-        eq_data.enabled[band] = 0;
-    }
-    else
-    {
-        if (band == 0)
-            eq_ls_coefs(cutoff, q, gain, eq_data.filters[band].coefs);
-        else if (band == 4)
-            eq_hs_coefs(cutoff, q, gain, eq_data.filters[band].coefs);
-        else
-            eq_pk_coefs(cutoff, q, gain, eq_data.filters[band].coefs);
-
-        eq_data.enabled[band] = 1;
-    }
-}
-
-/* Apply EQ filters to those bands that have got it switched on. */
-static void eq_process(int count, int32_t *buf[])
-{
-    static const int shifts[] =
-    {
-        EQ_SHELF_SHIFT,  /* low shelf  */
-        EQ_PEAK_SHIFT,   /* peaking    */
-        EQ_PEAK_SHIFT,   /* peaking    */
-        EQ_PEAK_SHIFT,   /* peaking    */
-        EQ_SHELF_SHIFT,  /* high shelf */
-    };
-    unsigned int channels = AUDIO_DSP.data.num_channels;
-    int i;
-
-    /* filter configuration currently is 1 low shelf filter, 3 band peaking
-       filters and 1 high shelf filter, in that order. we need to know this
-       so we can choose the correct shift factor.
-     */
-    for (i = 0; i < 5; i++)
-    {
-        if (!eq_data.enabled[i])
-            continue;
-        eq_filter(buf, &eq_data.filters[i], count, channels, shifts[i]);
-    }
-}
-
-/**
- * Use to enable the equalizer.
- *
- * @param enable true to enable the equalizer
- */
-void dsp_set_eq(bool enable)
-{
-    AUDIO_DSP.eq_process = enable ? eq_process : NULL;
-    set_gain(&AUDIO_DSP);
-}
-
-static void dsp_set_stereo_width(int value)
-{
-    long width, straight, cross;
-
-    width = value * 0x7fffff / 100;
-
-    if (value <= 100)
-    {
-        straight = (0x7fffff + width) / 2;
-        cross = straight - width;
-    }
-    else
-    {
-        /* straight = (1 + width) / (2 * width) */
-        straight = ((int64_t)(0x7fffff + width) << 22) / width;
-        cross = straight - 0x7fffff;
-    }
-
-    dsp_sw_gain  = straight << 8;
-    dsp_sw_cross = cross << 8;
-}
-
-/**
- * Implements the different channel configurations and stereo width.
- */
-
-/* SOUND_CHAN_STEREO mode is a noop so has no function - just outline one for
- * completeness. */
-#if 0
-static void channels_process_sound_chan_stereo(int count, int32_t *buf[])
-{
-    /* The channels are each just themselves */
-    (void)count; (void)buf;
-}
-#endif
-
-#ifndef DSP_HAVE_ASM_SOUND_CHAN_MONO
-static void channels_process_sound_chan_mono(int count, int32_t *buf[])
-{
-    int32_t *sl = buf[0], *sr = buf[1];
-
-    while (count-- > 0)
-    {
-        int32_t lr = *sl/2 + *sr/2;
-        *sl++ = lr;
-        *sr++ = lr;
-    }
-}
-#endif /* DSP_HAVE_ASM_SOUND_CHAN_MONO */
-
-#ifndef DSP_HAVE_ASM_SOUND_CHAN_CUSTOM
-static void channels_process_sound_chan_custom(int count, int32_t *buf[])
-{
-    const int32_t gain  = dsp_sw_gain;
-    const int32_t cross = dsp_sw_cross;
-    int32_t *sl = buf[0], *sr = buf[1];
-
-    while (count-- > 0)
-    {
-        int32_t l = *sl;
-        int32_t r = *sr;
-        *sl++ = FRACMUL(l, gain) + FRACMUL(r, cross);
-        *sr++ = FRACMUL(r, gain) + FRACMUL(l, cross);
-    }
-}
-#endif /* DSP_HAVE_ASM_SOUND_CHAN_CUSTOM */
-
-static void channels_process_sound_chan_mono_left(int count, int32_t *buf[])
-{
-    /* Just copy over the other channel */
-    memcpy(buf[1], buf[0], count * sizeof (*buf));
-}
-
-static void channels_process_sound_chan_mono_right(int count, int32_t *buf[])
-{
-    /* Just copy over the other channel */
-    memcpy(buf[0], buf[1], count * sizeof (*buf));
-}
-
-#ifndef DSP_HAVE_ASM_SOUND_CHAN_KARAOKE
-static void channels_process_sound_chan_karaoke(int count, int32_t *buf[])
-{
-    int32_t *sl = buf[0], *sr = buf[1];
-
-    while (count-- > 0)
-    {
-        int32_t ch = *sl/2 - *sr/2;
-        *sl++ = ch;
-        *sr++ = -ch;
-    }
-}
-#endif /* DSP_HAVE_ASM_SOUND_CHAN_KARAOKE */
-
-static void dsp_set_channel_config(int value)
-{
-    static const channels_process_fn_type channels_process_functions[] =
-    {
-        /* SOUND_CHAN_STEREO = All-purpose index for no channel processing */
-        [SOUND_CHAN_STEREO]     = NULL,
-        [SOUND_CHAN_MONO]       = channels_process_sound_chan_mono,
-        [SOUND_CHAN_CUSTOM]     = channels_process_sound_chan_custom,
-        [SOUND_CHAN_MONO_LEFT]  = channels_process_sound_chan_mono_left,
-        [SOUND_CHAN_MONO_RIGHT] = channels_process_sound_chan_mono_right,
-        [SOUND_CHAN_KARAOKE]    = channels_process_sound_chan_karaoke,
-    };
-
-    if ((unsigned)value >= ARRAYLEN(channels_process_functions) ||
-        AUDIO_DSP.stereo_mode == STEREO_MONO)
-    {
-        value = SOUND_CHAN_STEREO;
-    }
-
-    /* This doesn't apply to voice */
-    channels_mode = value;
-    AUDIO_DSP.channels_process = channels_process_functions[value];
-}
-
-#if CONFIG_CODEC == SWCODEC
-
-#ifdef HAVE_SW_TONE_CONTROLS
-static void set_tone_controls(void)
-{
-    filter_bishelf_coefs(0xffffffff/NATIVE_FREQUENCY*200,
-                         0xffffffff/NATIVE_FREQUENCY*3500,
-                         bass, treble, -prescale,
-                         AUDIO_DSP.tone_filter.coefs);
-    /* Sync the voice dsp coefficients */
-    memcpy(&VOICE_DSP.tone_filter.coefs, AUDIO_DSP.tone_filter.coefs,
-           sizeof (VOICE_DSP.tone_filter.coefs));
-}
-#endif
-
-/* Hook back from firmware/ part of audio, which can't/shouldn't call apps/
- * code directly.
- */
-int dsp_callback(int msg, intptr_t param)
-{
-    switch (msg)
-    {
-#ifdef HAVE_SW_TONE_CONTROLS
-    case DSP_CALLBACK_SET_PRESCALE:
-        prescale = param;
-        set_tone_controls();
-        break;
-    /* prescaler is always set after calling any of these, so we wait with
-     * calculating coefs until the above case is hit.
-     */
-    case DSP_CALLBACK_SET_BASS:
-        bass = param;
-        break;
-    case DSP_CALLBACK_SET_TREBLE:
-        treble = param;
-        break;
-#ifdef HAVE_SW_VOLUME_CONTROL
-    case DSP_CALLBACK_SET_SW_VOLUME:
-        set_gain(&AUDIO_DSP);
-        break;
-#endif
-#endif
-    case DSP_CALLBACK_SET_CHANNEL_CONFIG:
-        dsp_set_channel_config(param);
-        break;
-    case DSP_CALLBACK_SET_STEREO_WIDTH:
-        dsp_set_stereo_width(param);
-        break;
-    default:
-        break;
-    }
-    return 0;
-}
-#endif
-
-/* Process and convert src audio to dst based on the DSP configuration,
- * reading count number of audio samples. dst is assumed to be large
- * enough; use dsp_output_count() to get the required number. src is an
- * array of pointers; for mono and interleaved stereo, it contains one
- * pointer to the start of the audio data and the other is ignored; for
- * non-interleaved stereo, it contains two pointers, one for each audio
- * channel. Returns number of bytes written to dst.
- */
-int dsp_process(struct dsp_config *dsp, char *dst, const char *src[], int count)
-{
-    static int32_t *tmp[2]; /* tdspeed_doit() needs it static */
-    static long last_yield;
-    long tick;
-    int written = 0;
-
-#if defined(CPU_COLDFIRE)
-    /* set emac unit for dsp processing, and save old macsr, we're running in
-       codec thread context at this point, so can't clobber it */
-    unsigned long old_macsr = coldfire_get_macsr();
-    coldfire_set_macsr(EMAC_FRACTIONAL | EMAC_SATURATE);
-#endif
-
-    if (new_gain)
-        dsp_set_replaygain(); /* Gain has changed */
-
-    /* Perform at least one yield before starting */
-    last_yield = current_tick;
-    yield();
-
-    /* Testing function pointers for NULL is preferred since the pointer
-       will be preloaded to be used for the call if not. */
-    while (count > 0)
-    {
-        int samples = MIN(sample_buf_count, count);
-        count -= samples;
-
-        dsp->input_samples(samples, src, tmp);
-
-#ifdef HAVE_PITCHSCREEN
-        if (dsp->tdspeed_active)
-            samples = tdspeed_doit(tmp, samples);
-#endif
-        
-        int chunk_offset = 0;
-        while (samples > 0)
-        {
-            int32_t *t2[2];
-            t2[0] = tmp[0]+chunk_offset;
-            t2[1] = tmp[1]+chunk_offset;
-
-            int chunk = MIN(sample_buf_count, samples);
-            chunk_offset += chunk;
-            samples -= chunk;
-
-            if (dsp->apply_gain)
-                dsp->apply_gain(chunk, &dsp->data, t2);
-
-            if (dsp->resample && (chunk = resample(dsp, chunk, t2)) <= 0)
-                break; /* I'm pretty sure we're downsampling here */
-
-            if (dsp->apply_crossfeed)
-                dsp->apply_crossfeed(chunk, t2);
-
-            if (dsp->eq_process)
-                dsp->eq_process(chunk, t2);
-
-#ifdef HAVE_SW_TONE_CONTROLS
-            if ((bass | treble) != 0)
-                eq_filter(t2, &dsp->tone_filter, chunk,
-                      dsp->data.num_channels, FILTER_BISHELF_SHIFT);
-#endif
-
-            if (dsp->channels_process)
-                dsp->channels_process(chunk, t2);
-            
-            if (dsp->compressor_process)
-                dsp->compressor_process(chunk, &dsp->data, t2);
-
-            dsp->output_samples(chunk, &dsp->data, (const int32_t **)t2, (int16_t *)dst);
-
-            written += chunk;
-            dst += chunk * sizeof (int16_t) * 2;
-
-            /* yield at least once each tick */
-            tick = current_tick;
-            if (TIME_AFTER(tick, last_yield))
-            {
-                last_yield = tick;
-                yield();
-            }
-        }
-    }
-
-#if defined(CPU_COLDFIRE)
-    /* set old macsr again */
-    coldfire_set_macsr(old_macsr);
-#endif
-    return written;
-}
-
-/* Given count number of input samples, calculate the maximum number of
- * samples of output data that would be generated (the calculation is not
- * entirely exact and rounds upwards to be on the safe side; during
- * resampling, the number of samples generated depends on the current state
- * of the resampler).
- */
-/* dsp_input_size MUST be called afterwards */
-int dsp_output_count(struct dsp_config *dsp, int count)
-{
-#ifdef HAVE_PITCHSCREEN
-    if (dsp->tdspeed_active)
-        count = tdspeed_est_output_size();
-#endif
-    if (dsp->resample)
-    {
-        count = (int)(((unsigned long)count * NATIVE_FREQUENCY
-                    + (dsp->frequency - 1)) / dsp->frequency);
-    }
-
-    /* Now we have the resampled sample count which must not exceed
-     * resample_buf_count to avoid resample buffer overflow. One
-     * must call dsp_input_count() to get the correct input sample
-     * count.
-     */
-    if (count > resample_buf_count)
-        count = resample_buf_count;
-        
-    return count;
-}
-
-/* Given count output samples, calculate number of input samples
- * that would be consumed in order to fill the output buffer.
- */
-int dsp_input_count(struct dsp_config *dsp, int count)
-{
-    /* count is now the number of resampled input samples. Convert to
-       original input samples. */
-    if (dsp->resample)
-    {
-        /* Use the real resampling delta =
-         * dsp->frequency * 65536 / NATIVE_FREQUENCY, and
-         * round towards zero to avoid buffer overflows. */
-        count = (int)(((unsigned long)count *
-                      dsp->data.resample_data.delta) >> 16);
-    }
-
-#ifdef HAVE_PITCHSCREEN
-    if (dsp->tdspeed_active)
-        count = tdspeed_est_input_size(count);
-#endif
-
-    return count;
-}
-
-static void dsp_set_gain_var(long *var, long value)
-{
-    *var = value;
-    new_gain = true;
-}
-
-static void dsp_update_functions(struct dsp_config *dsp)
-{
-    sample_input_new_format(dsp);
-    sample_output_new_format(dsp);
-    if (dsp == &AUDIO_DSP)
-        dsp_set_crossfeed(crossfeed_enabled);
-}
-
-intptr_t dsp_configure(struct dsp_config *dsp, int setting, intptr_t value)
-{
-    switch (setting)
-    {
-    case DSP_MYDSP:
-        switch (value)
-        {
-        case CODEC_IDX_AUDIO:
-            return (intptr_t)&AUDIO_DSP;
-        case CODEC_IDX_VOICE:
-            return (intptr_t)&VOICE_DSP;
-        default:
-            return (intptr_t)NULL;
-        }
-
-    case DSP_SET_FREQUENCY:
-        memset(&dsp->data.resample_data, 0, sizeof (dsp->data.resample_data));
-        /* Fall through!!! */
-    case DSP_SWITCH_FREQUENCY:
-        dsp->codec_frequency = (value == 0) ? NATIVE_FREQUENCY : value;
-        /* Account for playback speed adjustment when setting dsp->frequency
-           if we're called from the main audio thread. Voice UI thread should
-           not need this feature.
-         */
-#ifdef HAVE_PITCHSCREEN
-        if (dsp == &AUDIO_DSP)
-            dsp->frequency = pitch_ratio * dsp->codec_frequency / PITCH_SPEED_100;
-        else
-#endif
-            dsp->frequency = dsp->codec_frequency;
-
-        resampler_new_delta(dsp);
-#ifdef HAVE_PITCHSCREEN
-        tdspeed_setup(dsp);
-#endif
-        break;
-
-    case DSP_SET_SAMPLE_DEPTH:
-        dsp->sample_depth = value;
-
-        if (dsp->sample_depth <= NATIVE_DEPTH)
-        {
-            dsp->data.frac_bits = WORD_FRACBITS;
-            dsp->sample_bytes = sizeof (int16_t); /* samples are 16 bits */
-            dsp->data.clip_max =  ((1 << WORD_FRACBITS) - 1);
-            dsp->data.clip_min = -((1 << WORD_FRACBITS));
-        }
-        else
-        {
-            dsp->data.frac_bits = value;
-            dsp->sample_bytes = sizeof (int32_t); /* samples are 32 bits */
-            dsp->data.clip_max = (1 << value) - 1;
-            dsp->data.clip_min = -(1 << value);
-        }
-
-        dsp->data.output_scale = dsp->data.frac_bits + 1 - NATIVE_DEPTH;
-        sample_input_new_format(dsp);
-        dither_init(dsp);
-        break;
-
-    case DSP_SET_STEREO_MODE:
-        dsp->stereo_mode = value;
-        dsp->data.num_channels = value == STEREO_MONO ? 1 : 2;
-        dsp_update_functions(dsp);
-#ifdef HAVE_PITCHSCREEN
-        tdspeed_setup(dsp);
-#endif
-        break;
-
-    case DSP_RESET:
-        dsp->stereo_mode = STEREO_NONINTERLEAVED;
-        dsp->data.num_channels = 2;
-        dsp->sample_depth = NATIVE_DEPTH;
-        dsp->data.frac_bits = WORD_FRACBITS;
-        dsp->sample_bytes = sizeof (int16_t);
-        dsp->data.output_scale = dsp->data.frac_bits + 1 - NATIVE_DEPTH;
-        dsp->data.clip_max =  ((1 << WORD_FRACBITS) - 1);
-        dsp->data.clip_min = -((1 << WORD_FRACBITS));
-        dsp->codec_frequency = dsp->frequency = NATIVE_FREQUENCY;
-
-        if (dsp == &AUDIO_DSP)
-        {
-            track_gain = 0;
-            album_gain = 0;
-            track_peak = 0;
-            album_peak = 0;
-            new_gain   = true;
-        }
-
-        dsp_update_functions(dsp);
-        resampler_new_delta(dsp);
-#ifdef HAVE_PITCHSCREEN
-        tdspeed_setup(dsp);
-#endif
-        if (dsp == &AUDIO_DSP)
-            compressor_reset();
-        break;
-
-    case DSP_FLUSH:
-        memset(&dsp->data.resample_data, 0,
-               sizeof (dsp->data.resample_data));
-        resampler_new_delta(dsp);
-        dither_init(dsp);
-#ifdef HAVE_PITCHSCREEN
-        tdspeed_setup(dsp);
-#endif
-        if (dsp == &AUDIO_DSP)
-            compressor_reset();
-        break;
-
-    case DSP_SET_TRACK_GAIN:
-        if (dsp == &AUDIO_DSP)
-            dsp_set_gain_var(&track_gain, value);
-        break;
-
-    case DSP_SET_ALBUM_GAIN:
-        if (dsp == &AUDIO_DSP)
-            dsp_set_gain_var(&album_gain, value);
-        break;
-
-    case DSP_SET_TRACK_PEAK:
-        if (dsp == &AUDIO_DSP)
-            dsp_set_gain_var(&track_peak, value);
-        break;
-
-    case DSP_SET_ALBUM_PEAK:
-        if (dsp == &AUDIO_DSP)
-            dsp_set_gain_var(&album_peak, value);
-        break;
-
-    default:
-        return 0;
-    }
-
-    return 1;
-}
-
-int get_replaygain_mode(bool have_track_gain, bool have_album_gain)
-{
-    int type;
-
-    bool track = ((global_settings.replaygain_type == REPLAYGAIN_TRACK)
-        || ((global_settings.replaygain_type == REPLAYGAIN_SHUFFLE)
-            && global_settings.playlist_shuffle));
-
-    type = (!track && have_album_gain) ? REPLAYGAIN_ALBUM 
-        : have_track_gain ? REPLAYGAIN_TRACK : -1;
-    
-    return type;
-}
-
-void dsp_set_replaygain(void)
-{
-    long gain = 0;
-
-    new_gain = false;
-
-    if ((global_settings.replaygain_type != REPLAYGAIN_OFF) ||
-            global_settings.replaygain_noclip)
-    {
-        bool track_mode = get_replaygain_mode(track_gain != 0,
-            album_gain != 0) == REPLAYGAIN_TRACK;
-        long peak = (track_mode || !album_peak) ? track_peak : album_peak;
-
-        if (global_settings.replaygain_type != REPLAYGAIN_OFF)
-        {
-            gain = (track_mode || !album_gain) ? track_gain : album_gain;
-
-            if (global_settings.replaygain_preamp)
-            {
-                long preamp = get_replaygain_int(
-                    global_settings.replaygain_preamp * 10);
-
-                gain = (long) (((int64_t) gain * preamp) >> 24);
-            }
-        }
-
-        if (gain == 0)
-        {
-            /* So that noclip can work even with no gain information. */
-            gain = DEFAULT_GAIN;
-        }
-
-        if (global_settings.replaygain_noclip && (peak != 0)
-            && ((((int64_t) gain * peak) >> 24) >= DEFAULT_GAIN))
-        {
-            gain = (((int64_t) DEFAULT_GAIN << 24) / peak);
-        }
-
-        if (gain == DEFAULT_GAIN)
-        {
-            /* Nothing to do, disable processing. */
-            gain = 0;
-        }
-    }
-
-    /* Store in S7.24 format to simplify calculations. */
-    replaygain = gain;
-    set_gain(&AUDIO_DSP);
-}
-
-/** SET COMPRESSOR
- *  Called by the menu system to configure the compressor process */
-void dsp_set_compressor(const struct compressor_settings *settings)
-{
-    /* enable/disable the compressor */
-    AUDIO_DSP.compressor_process = compressor_update(settings) ?
-                                        compressor_process : NULL;
-}