diff --git a/apps/plugin.c b/apps/plugin.c index d1e9a79..5689ef8 100644 --- a/apps/plugin.c +++ b/apps/plugin.c @@ -427,6 +427,7 @@ static const struct plugin_api rockbox_api = { pcm_play_pause, pcm_get_bytes_waiting, pcm_calculate_peaks, + pcm_get_peak_buffer, pcm_play_lock, pcm_play_unlock, #ifdef HAVE_RECORDING diff --git a/apps/plugin.h b/apps/plugin.h index d38cc42..b21e3c6 100644 --- a/apps/plugin.h +++ b/apps/plugin.h @@ -128,12 +128,12 @@ void* plugin_get_buffer(size_t *buffer_size); #define PLUGIN_MAGIC 0x526F634B /* RocK */ /* increase this every time the api struct changes */ -#define PLUGIN_API_VERSION 147 +#define PLUGIN_API_VERSION 148 /* update this to latest version if a change to the api struct breaks backwards compatibility (and please take the opportunity to sort in any new function which are "waiting" at the end of the function table) */ -#define PLUGIN_MIN_API_VERSION 147 +#define PLUGIN_MIN_API_VERSION 148 /* plugin return codes */ enum plugin_status { @@ -549,6 +549,7 @@ struct plugin_api { void (*pcm_play_pause)(bool play); size_t (*pcm_get_bytes_waiting)(void); void (*pcm_calculate_peaks)(int *left, int *right); + const void* (*pcm_get_peak_buffer)(int *count); void (*pcm_play_lock)(void); void (*pcm_play_unlock)(void); #ifdef HAVE_RECORDING diff --git a/apps/plugins/CATEGORIES b/apps/plugins/CATEGORIES index d6753ac..8e69099 100644 --- a/apps/plugins/CATEGORIES +++ b/apps/plugins/CATEGORIES @@ -20,6 +20,7 @@ dict,apps disktidy,apps doom,games euroconverter,apps +fft,demos fire,demos fireworks,demos firmware_flash,apps diff --git a/apps/plugins/SUBDIRS b/apps/plugins/SUBDIRS index af5e1d0..6317683 100644 --- a/apps/plugins/SUBDIRS +++ b/apps/plugins/SUBDIRS @@ -16,6 +16,9 @@ rockboy /* For all targets with a bitmap display */ #ifdef HAVE_LCD_BITMAP +#if CONFIG_CODEC == SWCODEC +fft +#endif chessbox jpeg sudoku diff --git a/apps/plugins/bitmaps/native/SOURCES b/apps/plugins/bitmaps/native/SOURCES index c46d176..3b8737f 100644 --- a/apps/plugins/bitmaps/native/SOURCES +++ b/apps/plugins/bitmaps/native/SOURCES @@ -221,6 +221,26 @@ clock_logo.112x64x1.bmp clock_messages.112x64x1.bmp #endif +/* FFT */ + +#ifdef HAVE_LCD_COLOR +#if LCD_WIDTH >= 320 && LCD_HEIGHT >= 240 +fft_gradient_vertical.320x240x16.bmp +fft_gradient_horizontal.320x240x16.bmp +fft_colors.320x240x16.bmp +#endif +#elif LCD_DEPTH > 1 /* grayscale */ +#if LCD_WIDTH >= 320 && LCD_HEIGHT >= 240 +fft_gradient_vertical.320x240x2.bmp +fft_gradient_horizontal.320x240x2.bmp +fft_colors.320x240x2.bmp +#elif LCD_WIDTH >= 160 && LCD_HEIGHT >= 128 +fft_gradient_vertical.160x128x2.bmp +fft_gradient_horizontal.160x128x2.bmp +fft_colors.320x240x2.bmp +#endif +#endif + /* Flipit */ #ifdef HAVE_LCD_COLOR #if LCD_WIDTH >= 280 && LCD_HEIGHT >= 234 diff --git a/apps/plugins/bitmaps/native/fft_colors.320x240x16.bmp b/apps/plugins/bitmaps/native/fft_colors.320x240x16.bmp new file mode 100644 index 0000000..20f6718 Binary files /dev/null and b/apps/plugins/bitmaps/native/fft_colors.320x240x16.bmp differ diff --git a/apps/plugins/bitmaps/native/fft_colors.320x240x2.bmp b/apps/plugins/bitmaps/native/fft_colors.320x240x2.bmp new file mode 100644 index 0000000..8e130f6 Binary files /dev/null and b/apps/plugins/bitmaps/native/fft_colors.320x240x2.bmp differ diff --git a/apps/plugins/bitmaps/native/fft_gradient_horizontal.160x128x2.bmp b/apps/plugins/bitmaps/native/fft_gradient_horizontal.160x128x2.bmp new file mode 100644 index 0000000..5d6f0ff Binary files /dev/null and b/apps/plugins/bitmaps/native/fft_gradient_horizontal.160x128x2.bmp differ diff --git a/apps/plugins/bitmaps/native/fft_gradient_horizontal.320x240x16.bmp b/apps/plugins/bitmaps/native/fft_gradient_horizontal.320x240x16.bmp new file mode 100644 index 0000000..4360981 Binary files /dev/null and b/apps/plugins/bitmaps/native/fft_gradient_horizontal.320x240x16.bmp differ diff --git a/apps/plugins/bitmaps/native/fft_gradient_horizontal.320x240x2.bmp b/apps/plugins/bitmaps/native/fft_gradient_horizontal.320x240x2.bmp new file mode 100644 index 0000000..c38d415 Binary files /dev/null and b/apps/plugins/bitmaps/native/fft_gradient_horizontal.320x240x2.bmp differ diff --git a/apps/plugins/bitmaps/native/fft_gradient_vertical.160x128x2.bmp b/apps/plugins/bitmaps/native/fft_gradient_vertical.160x128x2.bmp new file mode 100644 index 0000000..99c3f14 Binary files /dev/null and b/apps/plugins/bitmaps/native/fft_gradient_vertical.160x128x2.bmp differ diff --git a/apps/plugins/bitmaps/native/fft_gradient_vertical.320x240x16.bmp b/apps/plugins/bitmaps/native/fft_gradient_vertical.320x240x16.bmp new file mode 100644 index 0000000..957279d Binary files /dev/null and b/apps/plugins/bitmaps/native/fft_gradient_vertical.320x240x16.bmp differ diff --git a/apps/plugins/bitmaps/native/fft_gradient_vertical.320x240x2.bmp b/apps/plugins/bitmaps/native/fft_gradient_vertical.320x240x2.bmp new file mode 100644 index 0000000..7939cb2 Binary files /dev/null and b/apps/plugins/bitmaps/native/fft_gradient_vertical.320x240x2.bmp differ diff --git a/apps/plugins/fft/SOURCES b/apps/plugins/fft/SOURCES new file mode 100644 index 0000000..bc5660d --- /dev/null +++ b/apps/plugins/fft/SOURCES @@ -0,0 +1,3 @@ +kiss_fft.c +fft.c +math.c diff --git a/apps/plugins/fft/_kiss_fft_guts.h b/apps/plugins/fft/_kiss_fft_guts.h new file mode 100644 index 0000000..0bd5138 --- /dev/null +++ b/apps/plugins/fft/_kiss_fft_guts.h @@ -0,0 +1,145 @@ +/* +Copyright (c) 2003-2004, Mark Borgerding + +All rights reserved. + +Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: + + * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. + * Neither the author nor the names of any contributors may be used to endorse or promote products derived from this software without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + +/* kiss_fft.h + defines kiss_fft_scalar as either short or a float type + and defines + typedef struct { kiss_fft_scalar r; kiss_fft_scalar i; }kiss_fft_cpx; */ +#include "kiss_fft.h" +#include "math.h" +#include + +#define MAXFACTORS 32 +/* e.g. an fft of length 128 has 4 factors + as far as kissfft is concerned + 4*4*4*2 + */ + +struct kiss_fft_state{ + int nfft; + int inverse; + int factors[2*MAXFACTORS]; + kiss_fft_cpx twiddles[1]; +}; + +/* + Explanation of macros dealing with complex math: + + C_MUL(m,a,b) : m = a*b + C_FIXDIV( c , div ) : if a fixed point impl., c /= div. noop otherwise + C_SUB( res, a,b) : res = a - b + C_SUBFROM( res , a) : res -= a + C_ADDTO( res , a) : res += a + * */ +#ifdef FIXED_POINT +#if (FIXED_POINT==32) +# define FRACBITS 31 +# define SAMPPROD int64_t +#define SAMP_MAX 2147483647 +#else +# define FRACBITS 15 +# define SAMPPROD int32_t +#define SAMP_MAX 32767 +#endif + +#define SAMP_MIN -SAMP_MAX + +#if defined(CHECK_OVERFLOW) +# define CHECK_OVERFLOW_OP(a,op,b) \ + if ( (SAMPPROD)(a) op (SAMPPROD)(b) > SAMP_MAX || (SAMPPROD)(a) op (SAMPPROD)(b) < SAMP_MIN ) { \ + fprintf(stderr,"WARNING:overflow @ " __FILE__ "(%d): (%d " #op" %d) = %ld\n",__LINE__,(a),(b),(SAMPPROD)(a) op (SAMPPROD)(b) ); } +#endif + + +# define smul(a,b) ( (SAMPPROD)(a)*(b) ) +# define sround( x ) (kiss_fft_scalar)( ( (x) + (1<<(FRACBITS-1)) ) >> FRACBITS ) + +# define S_MUL(a,b) sround( smul(a,b) ) + +# define C_MUL(m,a,b) \ + do{ (m).r = sround( smul((a).r,(b).r) - smul((a).i,(b).i) ); \ + (m).i = sround( smul((a).r,(b).i) + smul((a).i,(b).r) ); }while(0) + +# define DIVSCALAR(x,k) \ + (x) = sround( smul( x, SAMP_MAX/k ) ) + +# define C_FIXDIV(c,div) \ + do { DIVSCALAR( (c).r , div); \ + DIVSCALAR( (c).i , div); }while (0) + +# define C_MULBYSCALAR( c, s ) \ + do{ (c).r = sround( smul( (c).r , s ) ) ;\ + (c).i = sround( smul( (c).i , s ) ) ; }while(0) + +#else /* not FIXED_POINT*/ + +# define S_MUL(a,b) ( (a)*(b) ) +#define C_MUL(m,a,b) \ + do{ (m).r = (a).r*(b).r - (a).i*(b).i;\ + (m).i = (a).r*(b).i + (a).i*(b).r; }while(0) +# define C_FIXDIV(c,div) /* NOOP */ +# define C_MULBYSCALAR( c, s ) \ + do{ (c).r *= (s);\ + (c).i *= (s); }while(0) +#endif + +#ifndef CHECK_OVERFLOW_OP +# define CHECK_OVERFLOW_OP(a,op,b) /* noop */ +#endif + +#define C_ADD( res, a,b)\ + do { \ + CHECK_OVERFLOW_OP((a).r,+,(b).r)\ + CHECK_OVERFLOW_OP((a).i,+,(b).i)\ + (res).r=(a).r+(b).r; (res).i=(a).i+(b).i; \ + }while(0) +#define C_SUB( res, a,b)\ + do { \ + CHECK_OVERFLOW_OP((a).r,-,(b).r)\ + CHECK_OVERFLOW_OP((a).i,-,(b).i)\ + (res).r=(a).r-(b).r; (res).i=(a).i-(b).i; \ + }while(0) +#define C_ADDTO( res , a)\ + do { \ + CHECK_OVERFLOW_OP((res).r,+,(a).r)\ + CHECK_OVERFLOW_OP((res).i,+,(a).i)\ + (res).r += (a).r; (res).i += (a).i;\ + }while(0) + +#define C_SUBFROM( res , a)\ + do {\ + CHECK_OVERFLOW_OP((res).r,-,(a).r)\ + CHECK_OVERFLOW_OP((res).i,-,(a).i)\ + (res).r -= (a).r; (res).i -= (a).i; \ + }while(0) + + +#ifdef FIXED_POINT +# define HALF_OF(x) ((x)>>1) +#else +# define HALF_OF(x) ((x)*.5) +#endif + +#define kf_cexp(x, k, n) \ + do{ \ + int32_t div = Q_DIV( (k) << 16, (n) << 16, 16 ); \ + long cos, sin = fsincos(div << 16, &cos); \ + (x)->r = ( Q_MUL(SAMP_MAX << 16, cos >> 15, 16) ) >> 16; \ + (x)->i = ( Q_MUL(SAMP_MAX << 16, -1*(sin >> 15), 16) ) >> 16; \ + }while(0) + + +/* a debugging function */ +#define pcpx(c)\ + fprintf(stderr,"%g + %gi\n",(double)((c)->r),(double)((c)->i) ) diff --git a/apps/plugins/fft/fft.c b/apps/plugins/fft/fft.c new file mode 100644 index 0000000..2fc74cf --- /dev/null +++ b/apps/plugins/fft/fft.c @@ -0,0 +1,1173 @@ +/*************************************************************************** +* __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id$ + * + * Copyright (C) 2009 Delyan Kratunov + * + * 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 "plugin.h" + +#include "lib/helper.h" +#include "lib/xlcd.h" +#include "math.h" + +#ifndef HAVE_LCD_COLOR +#include "lib/grey.h" +#endif + +PLUGIN_HEADER + +#ifndef HAVE_LCD_COLOR +GREY_INFO_STRUCT +#endif + +#if CONFIG_KEYPAD == ARCHOS_AV300_PAD +# define FFT_PREV_GRAPH BUTTON_LEFT +# define FFT_NEXT_GRAPH BUTTON_RIGHT +# define FFT_ORIENTATION BUTTON_F3 +# define FFT_WINDOW BUTTON_F1 +# define FFT_SCALE BUTTON_UP +# define FFT_COLOR BUTTON_DOWN +# define FFT_QUIT BUTTON_OFF + +#elif (CONFIG_KEYPAD == IRIVER_H100_PAD) || \ + (CONFIG_KEYPAD == IRIVER_H300_PAD) +# define FFT_PREV_GRAPH BUTTON_LEFT +# define FFT_NEXT_GRAPH BUTTON_RIGHT +# define FFT_ORIENTATION BUTTON_REC +# define FFT_WINDOW BUTTON_SELECT +# define FFT_SCALE BUTTON_UP +# define FFT_COLOR BUTTON_DOWN +# define FFT_QUIT BUTTON_OFF + +#elif (CONFIG_KEYPAD == IPOD_4G_PAD) || \ + (CONFIG_KEYPAD == IPOD_3G_PAD) || \ + (CONFIG_KEYPAD == IPOD_1G2G_PAD) +# define MINESWP_SCROLLWHEEL +# define FFT_PREV_GRAPH BUTTON_LEFT +# define FFT_NEXT_GRAPH BUTTON_RIGHT +# define FFT_ORIENTATION (BUTTON_SELECT | BUTTON_LEFT) +# define FFT_WINDOW (BUTTON_SELECT | BUTTON_RIGHT) +# define FFT_SCALE BUTTON_MENU +# define FFT_COLOR BUTTON_PLAY +# define FFT_QUIT (BUTTON_SELECT | BUTTON_MENU) + +#elif (CONFIG_KEYPAD == IAUDIO_X5M5_PAD) +# define FFT_PREV_GRAPH BUTTON_LEFT +# define FFT_NEXT_GRAPH BUTTON_RIGHT +# define FFT_ORIENTATION BUTTON_SELECT +# define FFT_WINDOW BUTTON_PLAY +# define FFT_SCALE BUTTON_UP +# define FFT_COLOR BUTTON_DOWN +# define FFT_QUIT BUTTON_POWER + +#elif (CONFIG_KEYPAD == GIGABEAT_PAD) +# define FFT_PREV_GRAPH BUTTON_LEFT +# define FFT_NEXT_GRAPH BUTTON_RIGHT +# define FFT_SCALE BUTTON_UP +# define FFT_ORIENTATION BUTTON_SELECT +# define FFT_WINDOW BUTTON_A +# define FFT_COLOR BUTTON_DOWN +# define FFT_QUIT BUTTON_POWER + +#elif (CONFIG_KEYPAD == SANSA_E200_PAD) +# define FFT_PREV_GRAPH BUTTON_LEFT +# define FFT_NEXT_GRAPH BUTTON_RIGHT +# define FFT_ORIENTATION BUTTON_SELECT +# define FFT_WINDOW BUTTON_REC +# define FFT_SCALE BUTTON_UP +# define FFT_COLOR BUTTON_DOWN +# define FFT_QUIT BUTTON_POWER + +#elif (CONFIG_KEYPAD == SANSA_FUZE_PAD) +# define FFT_PREV_GRAPH BUTTON_LEFT +# define FFT_NEXT_GRAPH BUTTON_RIGHT +# define FFT_ORIENTATION (BUTTON_SELECT | BUTTON_LEFT) +# define FFT_WINDOW (BUTTON_SELECT | BUTTON_RIGHT) +# define FFT_SCALE BUTTON_UP +# define FFT_COLOR BUTTON_DOWN +# define FFT_QUIT BUTTON_POWER + +#elif (CONFIG_KEYPAD == SANSA_C200_PAD) || \ +(CONFIG_KEYPAD == SANSA_M200_PAD) +# define FFT_PREV_GRAPH BUTTON_LEFT +# define FFT_NEXT_GRAPH BUTTON_RIGHT +# define FFT_ORIENTATION BUTTON_UP +# define FFT_WINDOW BUTTON_REC +# define FFT_SCALE BUTTON_SELECT +# define FFT_COLOR BUTTON_DOWN +# define FFT_QUIT BUTTON_POWER +#elif (CONFIG_KEYPAD == SANSA_CLIP_PAD) +# define FFT_PREV_GRAPH BUTTON_LEFT +# define FFT_NEXT_GRAPH BUTTON_RIGHT +# define FFT_ORIENTATION BUTTON_UP +# define FFT_WINDOW BUTTON_HOME +# define FFT_SCALE BUTTON_SELECT +# define FFT_COLOR BUTTON_DOWN +# define FFT_QUIT BUTTON_POWER + +#elif (CONFIG_KEYPAD == IRIVER_H10_PAD) +# define FFT_PREV_GRAPH BUTTON_LEFT +# define FFT_NEXT_GRAPH BUTTON_RIGHT +# define FFT_ORIENTATION BUTTON_FF +# define FFT_WINDOW BUTTON_SCROLL_UP +# define FFT_SCALE BUTTON_REW +# define FFT_COLOR BUTTON_PLAY +# define FFT_QUIT BUTTON_POWER + +#elif (CONFIG_KEYPAD == GIGABEAT_S_PAD) +# define FFT_PREV_GRAPH BUTTON_LEFT +# define FFT_NEXT_GRAPH BUTTON_RIGHT +# define FFT_ORIENTATION BUTTON_MENU +# define FFT_WINDOW BUTTON_PREV +# define FFT_SCALE BUTTON_UP +# define FFT_COLOR BUTTON_DOWN +# define FFT_QUIT BUTTON_BACK + +#elif (CONFIG_KEYPAD == MROBE100_PAD) +# define FFT_PREV_GRAPH BUTTON_LEFT +# define FFT_NEXT_GRAPH BUTTON_RIGHT +# define FFT_ORIENTATION BUTTON_PLAY +# define FFT_WINDOW BUTTON_SELECT +# define FFT_SCALE BUTTON_UP +# define FFT_COLOR BUTTON_DOWN +# define FFT_QUIT BUTTON_POWER + +#elif CONFIG_KEYPAD == IAUDIO_M3_PAD +# define FFT_PREV_GRAPH BUTTON_RC_REW +# define FFT_NEXT_GRAPH BUTTON_RC_FF +# define FFT_ORIENTATION BUTTON_RC_MODE +# define FFT_WINDOW BUTTON_RC_PLAY +# define FFT_SCALE BUTTON_RC_VOL_UP +# define FFT_COLOR BUTTON_RC_VOL_DOWN +# define FFT_QUIT BUTTON_RC_REC + +#elif (CONFIG_KEYPAD == COWOND2_PAD) +# define FFT_QUIT BUTTON_POWER +# define FFT_PREV_GRAPH BUTTON_PLUS +# define FFT_NEXT_GRAPH BUTTON_MINUS + +#elif CONFIG_KEYPAD == CREATIVEZVM_PAD +# define FFT_PREV_GRAPH BUTTON_LEFT +# define FFT_NEXT_GRAPH BUTTON_RIGHT +# define FFT_ORIENTATION BUTTON_MENU +# define FFT_WINDOW BUTTON_SELECT +# define FFT_SCALE BUTTON_UP +# define FFT_COLOR BUTTON_DOWN +# define FFT_QUIT BUTTON_BACK + +#elif CONFIG_KEYPAD == PHILIPS_HDD1630_PAD +# define FFT_PREV_GRAPH BUTTON_LEFT +# define FFT_NEXT_GRAPH BUTTON_RIGHT +# define FFT_ORIENTATION BUTTON_SELECT +# define FFT_WINDOW BUTTON_MENU +# define FFT_SCALE BUTTON_UP +# define FFT_COLOR BUTTON_DOWN +# define FFT_QUIT BUTTON_POWER + +#else +#error No keymap defined! +#endif + +#include "pluginbitmaps/fft_gradient_horizontal.h" +#include "pluginbitmaps/fft_gradient_vertical.h" +#include "pluginbitmaps/fft_colors.h" + +#include "kiss_fft.h" +#include "_kiss_fft_guts.h" /* sizeof(struct kiss_fft_state) */ + +#define FFT_SIZE (1024) +#define ARRAYSIZE_IN FFT_SIZE +#define ARRAYSIZE_OUT FFT_SIZE +#define ARRAYSIZE_PLOT FFT_SIZE/2 +#define BUFSIZE (sizeof(struct kiss_fft_state)+sizeof(kiss_fft_cpx)*(FFT_SIZE-1)) +#define FFT_ALLOC kiss_fft_alloc +#define FFT_FFT kiss_fft +#define FFT_CFG kiss_fft_cfg + +/****************************** Globals ****************************/ + +static kiss_fft_cpx input[ARRAYSIZE_IN]; +static kiss_fft_cpx output[ARRAYSIZE_OUT]; +static int32_t plot[ARRAYSIZE_PLOT]; +static char buffer[BUFSIZE]; + +#if LCD_DEPTH > 1 /* greyscale or color, enable spectrogram */ +#define MODES_COUNT 3 +#else +#define MODES_COUNT 2 +#endif + +const unsigned char* modes_text[] = { "Lines", "Bars", "Spectrogram" }; +const unsigned char* scales_text[] = { "Linear scale", "Logarithmic scale" }; +const unsigned char* window_text[] = { "Hamming window", "Hann window" }; +const unsigned int32_t refresh_rates[] = { 6, 10, 8 }; + +struct { + int32_t mode; + bool logarithmic; + bool orientation_vertical; + int window_func; + bool colored; + struct { + int column; + int row; + } spectrogram; + struct { + bool orientation; + bool mode; + bool scale; + } changed; +} graph_settings; + +#define COLORS BMPWIDTH_fft_colors + +static long next_update = 0; +/************************* End of globals *************************/ + +/************************* Math functions *************************/ +#define QLOG_MAX 286286 +#define QLIN_MAX 1534588906 +#define QLN_10 float_q16(2.302585093) +#define LIN_MAX (QLIN_MAX >> 16) + +/* Returns logarithmically scaled values in S15.16 format */ +inline int32_t get_log_value(int32_t value) +{ + return Q16_DIV(flog(value), QLN_10); +} + +/* Apply window function to input + * 0 - Hamming window + * 1 - Hann window */ +#define WINDOW_COUNT 2 +void apply_window_func(char mode) +{ + switch(mode) + { + case 0: /* Hamming window */ + { + const int32_t hamming_a = float_q(0.53836, 15), hamming_b = + float_q(0.46164, 15); + size_t i; + for (i = 0; i < ARRAYSIZE_IN; ++i) + { + int32_t cos; + (void) fsincos(Q16_DIV(i << 16, (ARRAYSIZE_IN - 1) << 16) << 16, + &cos); + cos >>= 16; + + /* value *= v(hamming_a - hamming_b * cos( 2 * pi * i/(ArraySize - 1) ) ) */ + input[i].r = Q15_MUL(input[i].r << 15, + (hamming_a - Q15_MUL(cos, hamming_b))) >> 15; + input[i].i = Q15_MUL(input[i].i << 15, + (hamming_a - Q15_MUL(cos, hamming_b))) >> 15; + } + break; + } + case 1: /* Hann window */ + { + size_t i; + for (i = 0; i < ARRAYSIZE_IN; ++i) + { + int32_t factor; + (void) fsincos(Q16_DIV(i << 16, (ARRAYSIZE_IN - 1) << 16) << 16, + &factor); + /* s16.15; cos( 2* pi * i/(ArraySize - 1))*/ + factor >>= 16; + /* 0.5 * cos( 2* pi * i/(ArraySize - 1))*/ + factor = Q15_MUL( (1 << 14), factor); + /* 0.5 - 0.5 * cos( 2* pi * i/(ArraySize - 1)))*/ + factor = (1 << 14) - factor; + + input[i].r = Q15_MUL(input[i].r << 15, factor) >> 15; + input[i].i = Q15_MUL(input[i].i << 15, factor) >> 15; + } + break; + } + } +} + +/* Calculates the magnitudes from complex numbers and returns the maximum */ +int32_t calc_magnitudes(bool logarithmic) +{ + int64_t tmp; + size_t i; + + // static int32_t max_ = 0; + // if(graph_settings.changed.scale) + // max_ = 0; + + int32_t max = -2147483647; + //const int32_t scale_bits = 0; + + /* Calculate the magnitude, discarding the phase. + * The sum of the squares can easily overflow the 15-bit (s15.16) + * requirement for fsqrt, so we scale the data down */ + for (i = 0; i < ARRAYSIZE_PLOT; ++i) + { + tmp = output[i].r * output[i].r + output[i].i * output[i].i; + tmp <<= 16;//tmp <<=(16 - scale_bits); + + tmp = fsqrt64(tmp, 16); + //if (scale_bits > 0) + // tmp = Q16_MUL(tmp, 1 << (16 + scale_bits/2)); + + if (logarithmic) + tmp = get_log_value(tmp & 0x7FFFFFFF); + + plot[i] = tmp; + + if (plot[i] > max) + max = plot[i]; + } + //if(max > max_) + // max_ = max, DEBUGF("%s: %s max: %i\n", __func__, logarithmic ? "log" : "lin", max_); + return max; +} +/************************ End of math functions ***********************/ + +/********************* Plotting functions (modes) *********************/ +void draw_lines_vertical(void); +void draw_lines_horizontal(void); +void draw_bars_vertical(void); +void draw_bars_horizontal(void); +void draw_spectrogram_vertical(void); +void draw_spectrogram_horizontal(void); + +void draw(const unsigned char* message) +{ + static uint32_t show_message = 0; + static unsigned char* last_message = 0; + + static char last_mode = 0; + static bool last_orientation = true, last_scale = true; + + if (message != 0) + { + last_message = (unsigned char*) message; + show_message = 5; + } + + if(last_mode != graph_settings.mode) + { + last_mode = graph_settings.mode; + graph_settings.changed.mode = true; + } + if(last_scale != graph_settings.logarithmic) + { + last_scale = graph_settings.logarithmic; + graph_settings.changed.scale = true; + } + if(last_orientation != graph_settings.orientation_vertical) + { + last_orientation = graph_settings.orientation_vertical; + graph_settings.changed.orientation = true; + } +#ifdef HAVE_LCD_COLOR + rb->lcd_set_foreground(LCD_DEFAULT_FG); + rb->lcd_set_background(LCD_DEFAULT_BG); +#else + grey_set_foreground(LCD_DEFAULT_FG); + grey_set_background(LCD_DEFAULT_BG); +#endif + + switch (graph_settings.mode) + { + default: + case 0: { +#ifdef HAVE_LCD_COLOR + rb->lcd_clear_display(); +#else + grey_clear_display(); +#endif + + if (graph_settings.orientation_vertical) + draw_lines_vertical(); + else + draw_lines_horizontal(); + break; + } + case 1: { +#ifdef HAVE_LCD_COLOR + rb->lcd_clear_display(); +#else + grey_clear_display(); +#endif + + if(graph_settings.orientation_vertical) + draw_bars_vertical(); + else + draw_bars_horizontal(); + + break; + } + case 2: { + if(graph_settings.orientation_vertical) + draw_spectrogram_vertical(); + else + draw_spectrogram_horizontal(); + break; + } + } + + if (show_message > 0) + { + int x, y; +#ifdef HAVE_LCD_COLOR + rb->lcd_getstringsize(last_message, &x, &y); +#else + grey_getstringsize(last_message, &x, &y); +#endif + x += 6; /* 3 px of horizontal padding and */ + y += 4; /* 2 px of vertical padding */ + + /* In vertical spectrogram mode, leave space for the popup */ + if(graph_settings.mode == 2) + { + if(graph_settings.orientation_vertical && + graph_settings.spectrogram.column > LCD_WIDTH-x-2) + { +#ifdef HAVE_LCD_COLOR + xlcd_scroll_left(graph_settings.spectrogram.column - + (LCD_WIDTH - x - 1)); +#else + grey_scroll_left(graph_settings.spectrogram.column - + (LCD_WIDTH - x - 1)); +#endif + graph_settings.spectrogram.column = LCD_WIDTH - x - 2; + } + } + +#ifdef HAVE_LCD_COLOR + rb->lcd_set_foreground(LCD_DARKGRAY); + rb->lcd_fillrect(LCD_WIDTH-1-x, 0, LCD_WIDTH-1, y); + + rb->lcd_set_foreground(LCD_DEFAULT_FG); + rb->lcd_set_background(LCD_DARKGRAY); + rb->lcd_putsxy(LCD_WIDTH-1-x+3, 2, last_message); + rb->lcd_set_background(LCD_DEFAULT_BG); +#else + grey_set_foreground(GREY_LIGHTGRAY); + grey_fillrect(LCD_WIDTH-1-x, 0, LCD_WIDTH-1, y); + + grey_set_foreground(LCD_DEFAULT_FG); + grey_set_background(GREY_LIGHTGRAY); + grey_putsxy(LCD_WIDTH-1-x+3, 2, last_message); + grey_set_background(LCD_DEFAULT_BG); +#endif + + show_message--; + } + else if(last_message != 0) + { + /* The popup shouldn't be shown anymore but we haven't deleted it yet*/ + int x, y; +#ifdef HAVE_LCD_COLOR + rb->lcd_getstringsize(last_message, &x, &y); +#else + grey_getstringsize(last_message, &x, &y); +#endif + x += 6; /* 3 px of horizontal padding and */ + y += 4; /* 2 px of vertical padding */ + + if(graph_settings.mode == 2 && !graph_settings.orientation_vertical) + { + /* In horizontal spectrogram mode, just scroll up by Y lines */ +#ifdef HAVE_LCD_COLOR + xlcd_scroll_up(y); +#else + grey_scroll_up(y); +#endif + graph_settings.spectrogram.row -= y; + if(graph_settings.spectrogram.row < 0) + graph_settings.spectrogram.row = 0; + } + else + { + /* In all other cases, erase the popup */ +#ifdef HAVE_LCD_COLOR + rb->lcd_set_foreground(LCD_DEFAULT_BG); + rb->lcd_fillrect(LCD_WIDTH-2-x, 0, LCD_WIDTH-1, y); + rb->lcd_set_foreground(LCD_DEFAULT_FG); +#else + grey_set_foreground(LCD_DEFAULT_BG); + grey_fillrect(LCD_WIDTH-2-x, 0, LCD_WIDTH-1, y); + grey_set_foreground(LCD_DEFAULT_FG); +#endif + } + last_message = 0; + } +#ifdef HAVE_LCD_COLOR + rb->lcd_update(); +#else + grey_update(); +#endif + + graph_settings.changed.mode = false; + graph_settings.changed.orientation = false; + graph_settings.changed.scale = false; + + /* we still have time in our time slot, so we sleep() */ + if (*rb->current_tick < next_update) + rb->sleep(next_update - *rb->current_tick); + + /* end of next time slot */ + next_update = *rb->current_tick + HZ / refresh_rates[graph_settings.mode]; +} + +void draw_lines_vertical(void) +{ + static int32_t max = 0, vfactor = 0, vfactor_count = 0; + static const int32_t hfactor = + Q16_DIV(LCD_WIDTH << 16, (ARRAYSIZE_PLOT) << 16), + bins_per_pixel = (ARRAYSIZE_PLOT) / LCD_WIDTH; + static bool old_scale = true; + + if (old_scale != graph_settings.logarithmic) + old_scale = graph_settings.logarithmic, max = 0; /* reset the graph on scaling mode change */ + + int32_t new_max = calc_magnitudes(graph_settings.logarithmic); + + if (new_max > max) + { + max = new_max; + vfactor = Q16_DIV(LCD_HEIGHT << 16, max); /* s15.16 */ + vfactor_count = Q16_DIV(vfactor, bins_per_pixel << 16); /* s15.16 */ + } + + if (new_max == 0 || max == 0) /* nothing to draw */ + return; + + + if(graph_settings.colored) + { +#ifdef HAVE_LCD_COLOR + rb->lcd_bitmap(fft_gradient_vertical, 0, 0, + BMPWIDTH_fft_gradient_vertical, BMPHEIGHT_fft_gradient_vertical); + /* Erase the lines with the background color */ + rb->lcd_set_foreground(LCD_DEFAULT_BG); +#else + grey_gray_bitmap(fft_gradient_vertical, 0, 0, BMPWIDTH_fft_gradient_vertical, BMPHEIGHT_fft_gradient_vertical); + grey_set_foreground(LCD_DEFAULT_BG); +#endif + } + + /* take the average of neighboring bins + * if we have to scale the graph horizontally */ + int64_t bins_avg = 0; + bool draw = true; + int32_t i; + for (i = 0; i < ARRAYSIZE_PLOT; ++i) + { + int32_t x = 0, y = 0; + + x = Q16_MUL(hfactor, i << 16) >> 16; + //x = (x + (1 << 15)) >> 16; + + if (hfactor < 65536) /* hfactor < 0, graph compression */ + { + draw = false; + bins_avg += plot[i]; + + /* fix the division by zero warning: + * bins_per_pixel is zero when the graph is expanding; + * execution won't even reach this point - this is a dummy constant + */ + const int32_t div = bins_per_pixel > 0 ? bins_per_pixel : 1; + if ((i + 1) % div == 0) + { + y = Q16_MUL(vfactor_count, bins_avg) >> 16; + + bins_avg = 0; + draw = true; + } + } + else + { + y = Q16_MUL(vfactor, plot[i]) >> 16; + draw = true; + } + + if (draw) + { +#ifdef HAVE_LCD_COLOR + if(graph_settings.colored) + rb->lcd_vline(x, 0, LCD_HEIGHT-y-1); + else + rb->lcd_vline(x, LCD_HEIGHT-1, LCD_HEIGHT-y-1); +#else + if(graph_settings.colored) + grey_vline(x, 0, LCD_HEIGHT-y-1); + else + grey_vline(x, LCD_HEIGHT-1, LCD_HEIGHT-y-1); +#endif + } + } +} + +void draw_lines_horizontal(void) +{ + static int max = 0; + + static const int32_t vfactor = + Q16_DIV(LCD_HEIGHT << 16, (ARRAYSIZE_PLOT) << 16), + bins_per_pixel = (ARRAYSIZE_PLOT) / LCD_HEIGHT; + + if (graph_settings.changed.scale) + max = 0; /* reset the graph on scaling mode change */ + + int32_t new_max = calc_magnitudes(graph_settings.logarithmic); + + if (new_max > max) + max = new_max; + + if (new_max == 0 || max == 0) /* nothing to draw */ + return; + + int32_t hfactor; + + hfactor = Q16_DIV((LCD_WIDTH - 1) << 16, max); /* s15.16 */ + + if(graph_settings.colored) + { +#ifdef HAVE_LCD_COLOR + rb->lcd_bitmap(fft_gradient_horizontal, 0, 0, + BMPWIDTH_fft_gradient_horizontal, BMPHEIGHT_fft_gradient_horizontal); + /* Erase the lines with the background color */ + rb->lcd_set_foreground(LCD_DEFAULT_BG); +#else + grey_gray_bitmap(fft_gradient_horizontal, 0, 0, BMPWIDTH_fft_gradient_horizontal, BMPHEIGHT_fft_gradient_horizontal); + grey_set_foreground(LCD_DEFAULT_BG); +#endif + } + + /* take the average of neighboring bins + * if we have to scale the graph horizontally */ + int64_t bins_avg = 0; + bool draw = true; + int32_t i; + for (i = 0; i < ARRAYSIZE_PLOT; ++i) + { + int32_t x = 0, y = 0; + + y = Q16_MUL(vfactor, i << 16) + (1 << 15); + y >>= 16; + + if (vfactor < 65536) /* vfactor < 0, graph compression */ + { + draw = false; + bins_avg += plot[i]; + + /* fix the division by zero warning: + * bins_per_pixel is zero when the graph is expanding; + * execution won't even reach this point - this is a dummy constant + */ + const int32_t div = bins_per_pixel > 0 ? bins_per_pixel : 1; + if ((i + 1) % div == 0) + { + bins_avg = Q16_DIV(bins_avg, div << 16); + x = Q16_MUL(hfactor, bins_avg) >> 16; + + bins_avg = 0; + draw = true; + } + } + else + { + y = Q16_MUL(hfactor, plot[i]) >> 16; + draw = true; + } + + if (draw) + { +#ifdef HAVE_LCD_COLOR + if(graph_settings.colored) + rb->lcd_hline(LCD_WIDTH-1, x, y); + else + rb->lcd_hline(0, x, y); +#else + if(graph_settings.colored) + grey_hline(LCD_WIDTH-1, x, y); + else + grey_hline(0, x, y); +#endif + } + } +#ifdef HAVE_LCD_COLOR + rb->lcd_set_foreground(LCD_DEFAULT_FG); +#else + grey_set_foreground(LCD_DEFAULT_FG); +#endif +} + +void draw_bars_vertical(void) +{ + static const unsigned int bars = 20, border = 2, items = ARRAYSIZE_PLOT + / bars, width = (LCD_WIDTH - ((bars - 1) * border)) / bars; + + calc_magnitudes(graph_settings.logarithmic); + + uint64_t bars_values[bars], bars_max = 0, avg = 0; + unsigned int i, bars_idx = 0; + for (i = 0; i < ARRAYSIZE_PLOT; ++i) + { + avg += plot[i]; + if ((i + 1) % items == 0) + { + /* Calculate the average value and keep the fractional part + * for some added precision */ + avg = Q16_DIV(avg, items << 16); + bars_values[bars_idx] = avg; + DEBUGF("%s: bars_value %i: %llu\n", __func__, bars_idx, avg); + + if (bars_values[bars_idx] > bars_max) + bars_max = bars_values[bars_idx]; + + bars_idx++; + avg = 0; + } + } + + if(bars_max == 0) /* nothing to draw */ + return; + + DEBUGF("%s: max: %llu\n", __func__, bars_max); + /* Give the graph some headroom */ + bars_max = Q16_MUL(bars_max, float_q16(1.1)); + + uint64_t vfactor = Q16_DIV(LCD_HEIGHT << 16, bars_max); + + for (i = 0; i < bars; ++i) + { + int x = (i) * (border + width); + int y; + y = Q16_MUL(vfactor, bars_values[i]) + (1 << 15); + y >>= 16; + DEBUGF("%s: bar: %i\n", __func__, y); +#ifdef HAVE_LCD_COLOR + rb->lcd_fillrect(x, LCD_HEIGHT - y - 1, width, y); +#else + grey_fillrect(x, LCD_HEIGHT - y - 1, width, y); +#endif + } +} + +void draw_bars_horizontal(void) +{ + static const unsigned int bars = 14, border = 3, items = ARRAYSIZE_PLOT + / bars, height = (LCD_HEIGHT - ((bars - 1) * border)) / bars; + + calc_magnitudes(graph_settings.logarithmic); + +#ifdef HAVE_LCD_COLOR + rb->lcd_set_foreground(LCD_DEFAULT_FG); +#else + grey_set_foreground(LCD_DEFAULT_FG); +#endif + int64_t bars_values[bars], bars_max = 0, avg = 0; + unsigned int i, bars_idx = 0; + for (i = 0; i < ARRAYSIZE_PLOT; ++i) + { + avg += plot[i]; + if ((i + 1) % items == 0) + { + /* Calculate the average value and keep the fractional part + * for some added precision */ + avg = Q16_DIV(avg, items << 16); /* s15.16 */ + bars_values[bars_idx] = avg; + + if (bars_values[bars_idx] > bars_max) + bars_max = bars_values[bars_idx]; + + bars_idx++; + avg = 0; + } + } + + if(bars_max == 0) /* nothing to draw */ + return; + + /* Give the graph some headroom */ + bars_max = Q16_MUL(bars_max, float_q16(1.1)); + + int64_t hfactor = Q16_DIV(LCD_WIDTH << 16, bars_max); + + for (i = 0; i < bars; ++i) + { + int y = (i) * (border + height); + int x; + x = Q16_MUL(hfactor, bars_values[i]) + (1 << 15); + x >>= 16; + +#ifdef HAVE_LCD_COLOR + rb->lcd_fillrect(0, y, x, height); +#else + grey_fillrect(0, y, x, height); +#endif + } +} + +void draw_spectrogram_vertical(void) +{ + const int32_t scale_factor = ARRAYSIZE_PLOT / LCD_HEIGHT, + colors_per_val_log = Q16_DIV((COLORS-1) << 16, QLOG_MAX), + colors_per_val_lin = Q16_DIV((COLORS-1) << 16, QLIN_MAX); + const int32_t remaining_div = + (ARRAYSIZE_PLOT-scale_factor*LCD_HEIGHT) > 0 ? + ( Q16_DIV((scale_factor*LCD_HEIGHT) << 16, + (ARRAYSIZE_PLOT-scale_factor*LCD_HEIGHT) << 16) + + (1<<15) ) >> 16 : 0; + + calc_magnitudes(graph_settings.logarithmic); + if(graph_settings.changed.mode || graph_settings.changed.orientation) + { + graph_settings.spectrogram.column = 0; +#ifdef HAVE_LCD_COLOR + rb->lcd_clear_display(); +#else + grey_clear_display(); +#endif + } + + int i, y = LCD_HEIGHT-1, count = 0, rem_count = 0; + uint64_t avg = 0; + bool added_extra_value = false; + for(i = 0; i < ARRAYSIZE_PLOT; ++i) + { + if(plot[i] > 0) + avg += plot[i]; + ++count; + ++rem_count; + + /* Kinda hacky - due to the rounding in scale_factor, we try to + * uniformly interweave the extra values in our calculations */ + if(remaining_div > 0 && rem_count >= remaining_div && + i < (ARRAYSIZE_PLOT-1)) + { + ++i; + if(plot[i] > 0) + avg += plot[i]; + rem_count = 0; + added_extra_value = true; + } + + if(count >= scale_factor) + { + if(added_extra_value) + { ++count; added_extra_value = false; } + + int32_t color; + + avg = Q16_DIV(avg, count << 16); + if(graph_settings.logarithmic) + color = Q16_MUL(avg, colors_per_val_log) >> 16; + else + color = Q16_MUL(avg, colors_per_val_lin) >> 16; + + if(color >= COLORS) /* TODO: investigate why we get these cases */ + color = COLORS-1; + else if (color < 0) + color = 0; + +#ifdef HAVE_LCD_COLOR + rb->lcd_set_foreground(fft_colors[color]); + rb->lcd_drawpixel(graph_settings.spectrogram.column, y); +#else + DEBUGF("%s: color: %li\n", __func__, color); + grey_set_foreground(fft_colors[color]); + grey_drawpixel(graph_settings.spectrogram.column, y); +#endif + + y--; + + avg = 0; + count = 0; + } + if(y < 0) + break; + } + if(graph_settings.spectrogram.column != LCD_WIDTH-1) + graph_settings.spectrogram.column++; + else +#ifdef HAVE_LCD_COLOR + xlcd_scroll_left(1); +#else + grey_scroll_left(1); +#endif +} +void draw_spectrogram_horizontal(void) +{ + const int32_t scale_factor = ARRAYSIZE_PLOT / LCD_WIDTH, + remaining_div = + ( Q16_DIV((scale_factor*LCD_WIDTH) << 16, + (ARRAYSIZE_PLOT-scale_factor*LCD_WIDTH) << 16) + + (1<<15) ) >> 16, + colors_per_val_log = Q16_DIV((COLORS-1) << 16, QLOG_MAX), + colors_per_val_lin = Q16_DIV((COLORS-1) << 16, QLIN_MAX); + + calc_magnitudes(graph_settings.logarithmic); + if(graph_settings.changed.mode || graph_settings.changed.orientation) + { + graph_settings.spectrogram.row = 0; +#ifdef HAVE_LCD_COLOR + rb->lcd_clear_display(); +#else + grey_clear_display(); +#endif + } + + int i, x = 0, count = 0, rem_count = 0; + uint64_t avg = 0; + bool added_extra_value = false; + for(i = 0; i < ARRAYSIZE_PLOT; ++i) + { + if(plot[i] > 0) + avg += plot[i]; + ++count; + ++rem_count; + + /* Kinda hacky - due to the rounding in scale_factor, we try to + * uniformly interweave the extra values in our calculations */ + if(remaining_div > 0 && rem_count >= remaining_div && + i < (ARRAYSIZE_PLOT-1)) + { + ++i; + if(plot[i] > 0) + avg += plot[i]; + rem_count = 0; + added_extra_value = true; + } + + if(count >= scale_factor) + { + if(added_extra_value) + { ++count; added_extra_value = false; } + + int32_t color; + + avg = Q16_DIV(avg, count << 16); + if(graph_settings.logarithmic) + color = Q16_MUL(avg, colors_per_val_log) >> 16; + else + color = Q16_MUL(avg, colors_per_val_lin) >> 16; + + if(color >= COLORS) /* TODO: investigate why we get these cases */ + color = COLORS-1; + else if (color < 0) + color = 0; + +#ifdef HAVE_LCD_COLOR + rb->lcd_set_foreground(fft_colors[color]); + rb->lcd_drawpixel(x, graph_settings.spectrogram.row); +#else + grey_set_foreground(fft_colors[color]); + grey_drawpixel(x, graph_settings.spectrogram.row); +#endif + + x++; + + avg = 0; + count = 0; + } + if(x >= LCD_WIDTH) + break; + } + if(graph_settings.spectrogram.row != LCD_HEIGHT-1) + graph_settings.spectrogram.row++; + else +#ifdef HAVE_LCD_COLOR + xlcd_scroll_up(1); +#else + grey_scroll_up(1); +#endif +} + +/********************* End of plotting functions (modes) *********************/ + +enum plugin_status plugin_start(const void* parameter) +{ + (void) parameter; + if ((rb->audio_status() & AUDIO_STATUS_PLAY) == 0) + { + rb->splash(HZ * 2, "No track playing. Exiting.."); + return PLUGIN_OK; + } +#ifndef HAVE_LCD_COLOR + unsigned char *gbuf; + size_t gbuf_size = 0; + /* get the remainder of the plugin buffer */ + gbuf = (unsigned char *) rb->plugin_get_buffer(&gbuf_size); + + /* initialize the greyscale buffer.*/ + if (!grey_init(gbuf, gbuf_size, GREY_ON_COP | GREY_BUFFERED, + LCD_WIDTH, LCD_HEIGHT, NULL)) + { + rb->splash(HZ, "Couldn't init greyscale display"); + return PLUGIN_ERROR; + } + grey_show(true); /* switch on greyscale overlay */ +#endif + +#if LCD_DEPTH > 1 + rb->lcd_set_backdrop(NULL); +#endif + backlight_force_on(); + +#ifdef HAVE_ADJUSTABLE_CPU_FREQ + rb->cpu_boost(true); +#endif + + /* Defaults */ + bool run = true; + graph_settings.mode = 0; + graph_settings.logarithmic = true; + graph_settings.orientation_vertical = true; + graph_settings.window_func = 0; + graph_settings.changed.mode = false; + graph_settings.changed.scale = false; + graph_settings.changed.orientation = false; + graph_settings.colored = false; + graph_settings.spectrogram.row = 0; + graph_settings.spectrogram.column = 0; + + bool changed_window = false; + + size_t size = sizeof(buffer); + kiss_fft_cfg state = kiss_fft_alloc(FFT_SIZE, 0, buffer, &size); + + if (state == 0) + { + DEBUGF("needed data: %i", (int) size); + return PLUGIN_ERROR; + } + + + kiss_fft_scalar left, right; + kiss_fft_scalar* value; + int count; + + /* set the end of the first time slot - rest of the + * next_update work is done in draw() */ + next_update = *rb->current_tick + HZ / refresh_rates[graph_settings.mode]; + + while (run) + { + value = (kiss_fft_scalar*) rb->pcm_get_peak_buffer(&count); + if (value == 0 || count == 0) + { + rb->yield(); + } + else + { + int idx = 0; /* offset in the buffer */ + int fft_idx = 0; /* offset in input */ + + do + { + left = *(value + idx); + idx += 2; + + right = *(value + idx); + idx += 2; + + input[fft_idx].r = left; + input[fft_idx].i = right; + fft_idx++; + + if (fft_idx == ARRAYSIZE_IN) + break; + } while (idx < count); + + if (fft_idx == ARRAYSIZE_IN) + { + apply_window_func(graph_settings.window_func); + + /* Play nice - the sleep at the end of draw() + * only tries to maintain the frame rate */ + rb->yield(); + kiss_fft(state, input, output); + rb->yield(); + if(changed_window) + { + draw(window_text[graph_settings.window_func]); + changed_window = false; + } + else + draw(0); + fft_idx = 0; + }; + } + int button = rb->button_get(false); + switch (button) + { + case FFT_QUIT: + run = false; + break; + case FFT_PREV_GRAPH: { + graph_settings.mode--; + if (graph_settings.mode < 0) + graph_settings.mode = MODES_COUNT-1; + draw(modes_text[graph_settings.mode]); + break; + } + case FFT_NEXT_GRAPH: { + graph_settings.mode++; + if (graph_settings.mode >= MODES_COUNT) + graph_settings.mode = 0; + draw(modes_text[graph_settings.mode]); + break; + } + case FFT_WINDOW: { + changed_window = true; + graph_settings.window_func ++; + if(graph_settings.window_func >= WINDOW_COUNT) + graph_settings.window_func = 0; + break; + } + case FFT_SCALE: { + graph_settings.logarithmic = !graph_settings.logarithmic; + draw(scales_text[graph_settings.logarithmic ? 1 : 0]); + break; + } + case FFT_ORIENTATION: { + graph_settings.orientation_vertical = !graph_settings.orientation_vertical; + draw(0); + break; + } +# ifdef HAVE_LCD_COLOR + case FFT_COLOR: { + graph_settings.colored = !graph_settings.colored; + draw(0); + break; + } +# endif + default: { + if (rb->default_event_handler(button) == SYS_USB_CONNECTED) + return PLUGIN_USB_CONNECTED; + } + + } + } +#ifdef HAVE_ADJUSTABLE_CPU_FREQ + rb->cpu_boost(false); +#endif +#ifndef HAVE_LCD_COLOR + grey_release(); +#endif + backlight_use_settings(); + return PLUGIN_OK; +} diff --git a/apps/plugins/fft/fft.make b/apps/plugins/fft/fft.make new file mode 100644 index 0000000..b14566c --- /dev/null +++ b/apps/plugins/fft/fft.make @@ -0,0 +1,27 @@ +# __________ __ ___. +# Open \______ \ ____ ____ | | _\_ |__ _______ ___ +# Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / +# Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < +# Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ +# \/ \/ \/ \/ \/ +# $Id$ +# + +FFTSRCDIR := $(APPSDIR)/plugins/fft +FFTBUILDDIR := $(BUILDDIR)/apps/plugins/fft + +ROCKS += $(FFTBUILDDIR)/fft.rock + +FFT_SRC := $(call preprocess, $(FFTSRCDIR)/SOURCES) +FFT_OBJ := $(call c2obj, $(FFT_SRC)) + +# add source files to OTHER_SRC to get automatic dependencies +OTHER_SRC += $(FFT_SRC) + +FFTFLAGS = $(filter-out -O%,$(PLUGINFLAGS)) -O3 -DFIXED_POINT=16 + +$(FFTBUILDDIR)/fft.rock: $(FFT_OBJ) + +$(FFTBUILDDIR)/%.o: $(FFTSRCDIR)/%.c $(FFTSRCDIR)/fft.make + $(SILENT)mkdir -p $(dir $@) + $(call PRINTS,CC $(subst $(ROOTDIR)/,,$<))$(CC) -I$(dir $<) $(FFTFLAGS) -c $< -o $@ diff --git a/apps/plugins/fft/kiss_fft.c b/apps/plugins/fft/kiss_fft.c new file mode 100644 index 0000000..b3fb50c --- /dev/null +++ b/apps/plugins/fft/kiss_fft.c @@ -0,0 +1,428 @@ +/* +Copyright (c) 2003-2004, Mark Borgerding + +All rights reserved. + +Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: + + * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. + * Neither the author nor the names of any contributors may be used to endorse or promote products derived from this software without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + + +#include "_kiss_fft_guts.h" +/* The guts header contains all the multiplication and addition macros that are defined for + fixed or floating point complex numbers. It also delares the kf_ internal functions. + */ + +static kiss_fft_cpx *scratchbuf=NULL; +static size_t nscratchbuf=0; +static kiss_fft_cpx *tmpbuf=NULL; +static size_t ntmpbuf=0; + +#define CHECKBUF(buf,nbuf,n) \ + do { \ + if ( nbuf < (size_t)(n) ) {\ + DEBUGF("CHECKBUF NOT IMPLEMENTED!");\ + break;\ + } \ + }while(0) + + +static void kf_bfly2( + kiss_fft_cpx * Fout, + const size_t fstride, + const kiss_fft_cfg st, + int m + ) +{ + kiss_fft_cpx * Fout2; + kiss_fft_cpx * tw1 = st->twiddles; + kiss_fft_cpx t; + Fout2 = Fout + m; + do{ + C_FIXDIV(*Fout,2); C_FIXDIV(*Fout2,2); + + C_MUL (t, *Fout2 , *tw1); + tw1 += fstride; + C_SUB( *Fout2 , *Fout , t ); + C_ADDTO( *Fout , t ); + ++Fout2; + ++Fout; + }while (--m); +} + +static void kf_bfly4( + kiss_fft_cpx * Fout, + const size_t fstride, + const kiss_fft_cfg st, + const size_t m + ) +{ + kiss_fft_cpx *tw1,*tw2,*tw3; + kiss_fft_cpx scratch[6]; + size_t k=m; + const size_t m2=2*m; + const size_t m3=3*m; + + tw3 = tw2 = tw1 = st->twiddles; + + do { + C_FIXDIV(*Fout,4); C_FIXDIV(Fout[m],4); C_FIXDIV(Fout[m2],4); C_FIXDIV(Fout[m3],4); + + C_MUL(scratch[0],Fout[m] , *tw1 ); + C_MUL(scratch[1],Fout[m2] , *tw2 ); + C_MUL(scratch[2],Fout[m3] , *tw3 ); + + C_SUB( scratch[5] , *Fout, scratch[1] ); + C_ADDTO(*Fout, scratch[1]); + C_ADD( scratch[3] , scratch[0] , scratch[2] ); + C_SUB( scratch[4] , scratch[0] , scratch[2] ); + C_SUB( Fout[m2], *Fout, scratch[3] ); + tw1 += fstride; + tw2 += fstride*2; + tw3 += fstride*3; + C_ADDTO( *Fout , scratch[3] ); + + if(st->inverse) { + Fout[m].r = scratch[5].r - scratch[4].i; + Fout[m].i = scratch[5].i + scratch[4].r; + Fout[m3].r = scratch[5].r + scratch[4].i; + Fout[m3].i = scratch[5].i - scratch[4].r; + }else{ + Fout[m].r = scratch[5].r + scratch[4].i; + Fout[m].i = scratch[5].i - scratch[4].r; + Fout[m3].r = scratch[5].r - scratch[4].i; + Fout[m3].i = scratch[5].i + scratch[4].r; + } + ++Fout; + }while(--k); +} + +static void kf_bfly3( + kiss_fft_cpx * Fout, + const size_t fstride, + const kiss_fft_cfg st, + size_t m + ) +{ + size_t k=m; + const size_t m2 = 2*m; + kiss_fft_cpx *tw1,*tw2; + kiss_fft_cpx scratch[5]; + kiss_fft_cpx epi3; + epi3 = st->twiddles[fstride*m]; + + tw1=tw2=st->twiddles; + + do{ + C_FIXDIV(*Fout,3); C_FIXDIV(Fout[m],3); C_FIXDIV(Fout[m2],3); + + C_MUL(scratch[1],Fout[m] , *tw1); + C_MUL(scratch[2],Fout[m2] , *tw2); + + C_ADD(scratch[3],scratch[1],scratch[2]); + C_SUB(scratch[0],scratch[1],scratch[2]); + tw1 += fstride; + tw2 += fstride*2; + + Fout[m].r = Fout->r - HALF_OF(scratch[3].r); + Fout[m].i = Fout->i - HALF_OF(scratch[3].i); + + C_MULBYSCALAR( scratch[0] , epi3.i ); + + C_ADDTO(*Fout,scratch[3]); + + Fout[m2].r = Fout[m].r + scratch[0].i; + Fout[m2].i = Fout[m].i - scratch[0].r; + + Fout[m].r -= scratch[0].i; + Fout[m].i += scratch[0].r; + + ++Fout; + }while(--k); +} + +static void kf_bfly5( + kiss_fft_cpx * Fout, + const size_t fstride, + const kiss_fft_cfg st, + int m + ) +{ + kiss_fft_cpx *Fout0,*Fout1,*Fout2,*Fout3,*Fout4; + int u; + kiss_fft_cpx scratch[13]; + kiss_fft_cpx * twiddles = st->twiddles; + kiss_fft_cpx *tw; + kiss_fft_cpx ya,yb; + ya = twiddles[fstride*m]; + yb = twiddles[fstride*2*m]; + + Fout0=Fout; + Fout1=Fout0+m; + Fout2=Fout0+2*m; + Fout3=Fout0+3*m; + Fout4=Fout0+4*m; + + tw=st->twiddles; + for ( u=0; ur += scratch[7].r + scratch[8].r; + Fout0->i += scratch[7].i + scratch[8].i; + + scratch[5].r = scratch[0].r + S_MUL(scratch[7].r,ya.r) + S_MUL(scratch[8].r,yb.r); + scratch[5].i = scratch[0].i + S_MUL(scratch[7].i,ya.r) + S_MUL(scratch[8].i,yb.r); + + scratch[6].r = S_MUL(scratch[10].i,ya.i) + S_MUL(scratch[9].i,yb.i); + scratch[6].i = -S_MUL(scratch[10].r,ya.i) - S_MUL(scratch[9].r,yb.i); + + C_SUB(*Fout1,scratch[5],scratch[6]); + C_ADD(*Fout4,scratch[5],scratch[6]); + + scratch[11].r = scratch[0].r + S_MUL(scratch[7].r,yb.r) + S_MUL(scratch[8].r,ya.r); + scratch[11].i = scratch[0].i + S_MUL(scratch[7].i,yb.r) + S_MUL(scratch[8].i,ya.r); + scratch[12].r = - S_MUL(scratch[10].i,yb.i) + S_MUL(scratch[9].i,ya.i); + scratch[12].i = S_MUL(scratch[10].r,yb.i) - S_MUL(scratch[9].r,ya.i); + + C_ADD(*Fout2,scratch[11],scratch[12]); + C_SUB(*Fout3,scratch[11],scratch[12]); + + ++Fout0;++Fout1;++Fout2;++Fout3;++Fout4; + } +} + +/* perform the butterfly for one stage of a mixed radix FFT */ +static void kf_bfly_generic( + kiss_fft_cpx * Fout, + const size_t fstride, + const kiss_fft_cfg st, + int m, + int p + ) +{ + int u,k,q1,q; + kiss_fft_cpx * twiddles = st->twiddles; + kiss_fft_cpx t; + int Norig = st->nfft; + + CHECKBUF(scratchbuf,nscratchbuf,p); + + for ( u=0; u=Norig) twidx-=Norig; + C_MUL(t,scratchbuf[q] , twiddles[twidx] ); + C_ADDTO( Fout[ k ] ,t); + } + k += m; + } + } +} + +static +void kf_work( + kiss_fft_cpx * Fout, + const kiss_fft_cpx * f, + const size_t fstride, + int in_stride, + int * factors, + const kiss_fft_cfg st + ) +{ + kiss_fft_cpx * Fout_beg=Fout; + const int p=*factors++; /* the radix */ + const int m=*factors++; /* stage's fft length/p */ + const kiss_fft_cpx * Fout_end = Fout + p*m; + +#ifdef _OPENMP + // use openmp extensions at the + // top-level (not recursive) + if (fstride==1) { + int k; + + // execute the p different work units in different threads +# pragma omp parallel for + for (k=0;k> 15; + + /*factor out powers of 4, powers of 2, then any remaining primes */ + do { + while (n % p) { + switch (p) { + case 4: p = 2; break; + case 2: p = 3; break; + default: p += 2; break; + } + if (p > floor_sqrt) + p = n; /* no more factors, skip to end */ + } + n /= p; + *facbuf++ = p; + *facbuf++ = n; + } while (n > 1); +} + +/* + * + * User-callable function to allocate all necessary storage space for the fft. + * + * The return value is a contiguous block of memory, allocated with malloc. As such, + * It can be freed with free(), rather than a kiss_fft-specific function. + * */ +kiss_fft_cfg kiss_fft_alloc(int nfft,int inverse_fft,void * mem,size_t * lenmem ) +{ + kiss_fft_cfg st=NULL; + size_t memneeded = sizeof(struct kiss_fft_state) + + sizeof(kiss_fft_cpx)*(nfft-1); /* twiddle factors*/ + + if ( lenmem==NULL ) { + DEBUGF("This version of kiss fft can't use malloc"); + return st; + /* st = ( kiss_fft_cfg)KISS_FFT_MALLOC( memneeded ); */ + }else{ + if (mem != NULL && *lenmem >= memneeded) + st = (kiss_fft_cfg)mem; + *lenmem = memneeded; + } + if (st) { + int i; + st->nfft=nfft; + st->inverse = inverse_fft; + + for (i=0;iinverse) + DEBUGF("Inverse FFT not implemented!"); /* kf_cexp(st->twiddles+i, -1*i, nfft ); */ + else + kf_cexp( st->twiddles+i, i, nfft ); + } + + kf_factor(nfft,st->factors); + } + return st; +} + + + + +void kiss_fft_stride(kiss_fft_cfg st,const kiss_fft_cpx *fin,kiss_fft_cpx *fout,int in_stride) +{ + if (fin == fout) { + CHECKBUF(tmpbuf,ntmpbuf,st->nfft); + kf_work(tmpbuf,fin,1,in_stride, st->factors,st); + memcpy(fout,tmpbuf,sizeof(kiss_fft_cpx)*st->nfft); + }else{ + kf_work( fout, fin, 1,in_stride, st->factors,st ); + } +} + +void kiss_fft(kiss_fft_cfg cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout) +{ + kiss_fft_stride(cfg,fin,fout,1); +} + + +/* not really necessary to call, but if someone is doing in-place ffts, they may want to free the + buffers from CHECKBUF + */ +void kiss_fft_cleanup(void) +{ + /* free(scratchbuf); */ + scratchbuf = NULL; + nscratchbuf=0; + /* free(tmpbuf); */ + tmpbuf=NULL; + ntmpbuf=0; +} + +int kiss_fft_next_fast_size(int n) +{ + while(1) { + int m=n; + while ( (m%2) == 0 ) m/=2; + while ( (m%3) == 0 ) m/=3; + while ( (m%5) == 0 ) m/=5; + if (m<=1) + break; /* n is completely factorable by twos, threes, and fives */ + n++; + } + return n; +} diff --git a/apps/plugins/fft/kiss_fft.h b/apps/plugins/fft/kiss_fft.h new file mode 100644 index 0000000..35c8648 --- /dev/null +++ b/apps/plugins/fft/kiss_fft.h @@ -0,0 +1,119 @@ +#ifndef KISS_FFT_H +#define KISS_FFT_H + +#include +#include +#include +#include +#include +#include "plugin.h" +#include "lib/helper.h" + +#ifdef __cplusplus +extern "C" { +#endif + +/* + ATTENTION! + If you would like a : + -- a utility that will handle the caching of fft objects + -- real-only (no imaginary time component ) FFT + -- a multi-dimensional FFT + -- a command-line utility to perform ffts + -- a command-line utility to perform fast-convolution filtering + + Then see kfc.h kiss_fftr.h kiss_fftnd.h fftutil.c kiss_fastfir.c + in the tools/ directory. +*/ + +#define KISS_FFT_MALLOC malloc + + +#ifdef FIXED_POINT +#include +# if (FIXED_POINT == 32) +# define kiss_fft_scalar int32_t +# else +# define kiss_fft_scalar int16_t +# endif +#else +# ifndef kiss_fft_scalar +/* default is float */ +# define kiss_fft_scalar float +# endif +#endif + +typedef struct { + kiss_fft_scalar r; + kiss_fft_scalar i; +}kiss_fft_cpx; + +typedef struct kiss_fft_state* kiss_fft_cfg; + +/* + * kiss_fft_alloc + * + * Initialize a FFT (or IFFT) algorithm's cfg/state buffer. + * + * typical usage: kiss_fft_cfg mycfg=kiss_fft_alloc(1024,0,NULL,NULL); + * + * The return value from fft_alloc is a cfg buffer used internally + * by the fft routine or NULL. + * + * If lenmem is NULL, then kiss_fft_alloc will allocate a cfg buffer using malloc. + * The returned value should be free()d when done to avoid memory leaks. + * + * The state can be placed in a user supplied buffer 'mem': + * If lenmem is not NULL and mem is not NULL and *lenmem is large enough, + * then the function places the cfg in mem and the size used in *lenmem + * and returns mem. + * + * If lenmem is not NULL and ( mem is NULL or *lenmem is not large enough), + * then the function returns NULL and places the minimum cfg + * buffer size in *lenmem. + * */ + +kiss_fft_cfg kiss_fft_alloc(int nfft,int inverse_fft,void * mem,size_t * lenmem); + +/* + * kiss_fft(cfg,in_out_buf) + * + * Perform an FFT on a complex input buffer. + * for a forward FFT, + * fin should be f[0] , f[1] , ... ,f[nfft-1] + * fout will be F[0] , F[1] , ... ,F[nfft-1] + * Note that each element is complex and can be accessed like + f[k].r and f[k].i + * */ +void kiss_fft(kiss_fft_cfg cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout); + +/* + A more generic version of the above function. It reads its input from every Nth sample. + * */ +void kiss_fft_stride(kiss_fft_cfg cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout,int fin_stride); + +/* If kiss_fft_alloc allocated a buffer, it is one contiguous + buffer and can be simply free()d when no longer needed*/ +#define kiss_fft_free free + +/* + Cleans up some memory that gets managed internally. Not necessary to call, but it might clean up + your compiler output to call this before you exit. +*/ +void kiss_fft_cleanup(void); + + +/* + * Returns the smallest integer k, such that k>=n and k has only "fast" factors (2,3,5) + */ +int kiss_fft_next_fast_size(int n); + +/* for real ffts, we need an even size */ +#define kiss_fftr_next_fast_size_real(n) \ + (kiss_fft_next_fast_size( ((n)+1)>>1)<<1) + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/apps/plugins/fft/math.c b/apps/plugins/fft/math.c new file mode 100644 index 0000000..c00804f --- /dev/null +++ b/apps/plugins/fft/math.c @@ -0,0 +1,13 @@ +#include "math.h" + +int64_t fsqrt64(int64_t a, unsigned int fracbits) +{ + int64_t b = a/2 + (1 << fracbits); /* initial approximation */ + unsigned int n; + const unsigned int iterations = 3; /* very rough approximation */ + + for (n = 0; n < iterations; ++n) + b = (b + (((int64_t)(a) << fracbits)/b))/2; + + return b; +} diff --git a/apps/plugins/fft/math.h b/apps/plugins/fft/math.h new file mode 100644 index 0000000..450b9aa --- /dev/null +++ b/apps/plugins/fft/math.h @@ -0,0 +1,28 @@ +#ifndef __MATH_H_ +#define __MATH_H_ + +#include +#include +#include "lib/fixedpoint.h" + +#define Q_MUL(a, b, bits) (( (int64_t) (a) * (int64_t) (b) ) >> (bits)) +#define Q15_MUL(a, b) Q_MUL(a,b,15) +#define Q16_MUL(a, b) Q_MUL(a,b,16) + +#define Q_DIV(a, b, bits) ( (((int64_t) (a)) << (bits)) / (b) ) +#define Q15_DIV(a, b) Q_DIV(a,b,15) +#define Q16_DIV(a, b) Q_DIV(a,b,16) + +#define float_q(a, bits) (int32_t)( ((float)(a)) *(1<<(bits))) +#define float_q15(a) float_q(a, 15) +#define float_q16(a) float_q(a, 16) + +/** + * Fixed point square root via Newton-Raphson. + * @param a square root argument. + * @param fracbits specifies number of fractional bits in argument. + * @return Square root of argument in same fixed point format as input. + */ +int64_t fsqrt64(int64_t a, unsigned int fracbits); + +#endif diff --git a/firmware/export/pcm.h b/firmware/export/pcm.h index 444e0c9..b9ad913 100644 --- a/firmware/export/pcm.h +++ b/firmware/export/pcm.h @@ -75,6 +75,7 @@ void pcm_play_data(pcm_more_callback_type get_more, unsigned char* start, size_t size); void pcm_calculate_peaks(int *left, int *right); +const void* pcm_get_peak_buffer(int* count); size_t pcm_get_bytes_waiting(void); void pcm_play_stop(void); diff --git a/firmware/pcm.c b/firmware/pcm.c index bc7ec02..a4c3c94 100644 --- a/firmware/pcm.c +++ b/firmware/pcm.c @@ -180,6 +180,11 @@ void pcm_calculate_peaks(int *left, int *right) *right = peaks[1]; } +const void* pcm_get_peak_buffer(int * count) +{ + return pcm_play_dma_get_peak_buffer(count); +} + /**************************************************************************** * Functions that do not require targeted implementation but only a targeted * interface