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/jni/Common.h

https://gitlab.com/madamovic-bg/FPlayAndroid
C Header | 542 lines | 427 code | 26 blank | 89 comment | 105 complexity | 6e6819be5075c4140045caf7a2eb57c5 MD5 | raw file
    

  1. //
    2. 

  2. // FPlayAndroid is distributed under the FreeBSD License
    3. 

  3. //
    4. 

  4. // Copyright (c) 2013-2014, Carlos Rafael Gimenes das Neves
    5. 

  5. // All rights reserved.
    6. 

  6. //
    7. 

  7. // Redistribution and use in source and binary forms, with or without
    8. 

  8. // modification, are permitted provided that the following conditions are met:
    9. 

  9. //
    10. 

  10. // 1. Redistributions of source code must retain the above copyright notice, this
    11. 

  11. //    list of conditions and the following disclaimer.
    12. 

  12. // 2. Redistributions in binary form must reproduce the above copyright notice,
    13. 

  13. //    this list of conditions and the following disclaimer in the documentation
    14. 

  14. //    and/or other materials provided with the distribution.
    15. 

  15. //
    16. 

  16. // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
    17. 

  17. // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    18. 

  18. // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    19. 

  19. // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
    20. 

  20. // ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    21. 

  21. // (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
    22. 

  22. // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    23. 

  23. // ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    24. 

  24. // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    25. 

  25. // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    26. 

  26. //
    27. 

  27. // The views and conclusions contained in the software and documentation are those
    28. 

  28. // of the authors and should not be interpreted as representing official policies,
    29. 

  29. // either expressed or implied, of the FreeBSD Project.
    30. 

  30. //
    31. 

  31. // https://github.com/carlosrafaelgn/FPlayAndroid
    32. 

  32. //
    33. 

  33. 

  34. #include "SimpleMutex.h"
    35. 

  35. #include "CommonNeon.h"
    36. 

  36. #include "FixedFFT.h"
    37. 

  37. #include <time.h>
    38. 

  38. 

  39. //for the alignment:
    40. 

  40. //https://gcc.gnu.org/onlinedocs/gcc-3.2/gcc/Variable-Attributes.html
    41. 

  41. 

  42. //to make the math easier COLORS has 257 int's (from 0 to 256) for each different color
    43. 

  43. const unsigned short COLORS[] __attribute__((aligned(16))) = { 	/*Blue */ 0x0000, 0x0816, 0x0816, 0x0815, 0x0815, 0x0815, 0x1015, 0x1015, 0x1015, 0x1015, 0x1015, 0x1015, 0x1815, 0x1814, 0x1814, 0x1814, 0x1814, 0x2014, 0x2014, 0x2014, 0x2013, 0x2013, 0x2813, 0x2813, 0x2813, 0x2813, 0x3012, 0x3012, 0x3012, 0x3012, 0x3812, 0x3811, 0x3811, 0x3811, 0x4011, 0x4011, 0x4011, 0x4010, 0x4810, 0x4810, 0x4810, 0x4810, 0x500f, 0x500f, 0x500f, 0x500f, 0x580f, 0x580e, 0x580e, 0x600e, 0x600e, 0x600d, 0x680d, 0x680d, 0x680d, 0x680d, 0x700c, 0x700c, 0x700c, 0x780c, 0x780c, 0x780b, 0x800b, 0x800b, 0x800b, 0x800a, 0x880a, 0x880a, 0x880a, 0x900a, 0x9009, 0x9009, 0x9009, 0x9809, 0x9809, 0x9808, 0xa008, 0xa008, 0xa008, 0xa807, 0xa807, 0xa807, 0xa807, 0xb007, 0xb006, 0xb006, 0xb806, 0xb806, 0xb806, 0xb805, 0xc005, 0xc005, 0xc005, 0xc005, 0xc804, 0xc804, 0xc804, 0xc804, 0xd004, 0xd004, 0xd003, 0xd003, 0xd803, 0xd803, 0xd803, 0xd802, 0xe002, 0xe002, 0xe002, 0xe002, 0xe002, 0xe802, 0xe801, 0xe801, 0xe801, 0xe801, 0xf001, 0xf001, 0xf001, 0xf000, 0xf000, 0xf000, 0xf800, 0xf800, 0xf800, 0xf800, 0xf800, 0xf800, 0xf800, 0xf800, 0xf800, 0xf800, 0xf820, 0xf820, 0xf820, 0xf840, 0xf840, 0xf840, 0xf860, 0xf860, 0xf860, 0xf880, 0xf880, 0xf8a0, 0xf8a0, 0xf8a0, 0xf8c0, 0xf8c0, 0xf8e0, 0xf8e0, 0xf900, 0xf900, 0xf900, 0xf920, 0xf920, 0xf940, 0xf940, 0xf960, 0xf960, 0xf980, 0xf9a0, 0xf9a0, 0xf9a0, 0xf9c0, 0xf9e0, 0xf9e0, 0xfa00, 0xfa00, 0xfa20, 0xfa20, 0xfa40, 0xfa40, 0xfa60, 0xfa80, 0xfa80, 0xfaa0, 0xfaa0, 0xfac0, 0xfae0, 0xfae0, 0xfb00, 0xfb00, 0xfb20, 0xfb40, 0xfb40, 0xfb60, 0xfb60, 0xfb80, 0xfba0, 0xfba0, 0xfbc0, 0xfbe0, 0xfbe0, 0xfc00, 0xfc00, 0xfc20, 0xfc20, 0xfc40, 0xfc60, 0xfc60, 0xfc80, 0xfca0, 0xfca0, 0xfcc0, 0xfcc0, 0xfce0, 0xfd00, 0xfd00, 0xfd20, 0xfd20, 0xfd40, 0xfd60, 0xfd60, 0xfd80, 0xfd80, 0xfda0, 0xfda0, 0xfdc0, 0xfde0, 0xfde0, 0xfe00, 0xfe00, 0xfe20, 0xfe20, 0xfe40, 0xfe40, 0xfe60, 0xfe60, 0xfe80, 0xfe80, 0xfea0, 0xfea0, 0xfec0, 0xfec0, 0xfee0, 0xfee0, 0xff00, 0xff00, 0xff20, 0xff20, 0xff20, 0xff40, 0xff40, 0xff40, 0xff60, 0xff60, 0xff80, 0xff80, 0xff80, 0xffa0, 0xffa0, 0xffa0, 0xffc0, 0xffc0, 0xffc0, 0xffc0, 0xffc0,
    44. 

  44. 																		/*Green*/ 0x0000, 0x0000, 0x0000, 0x0020, 0x0020, 0x0040, 0x0040, 0x0060, 0x0060, 0x0080, 0x00a0, 0x00a0, 0x00c0, 0x00e0, 0x00e0, 0x0100, 0x0120, 0x0140, 0x0160, 0x0160, 0x0180, 0x01a0, 0x01c0, 0x01e0, 0x01e0, 0x0200, 0x0220, 0x0240, 0x0260, 0x0280, 0x0280, 0x02a0, 0x02c0, 0x02e0, 0x0300, 0x0320, 0x0340, 0x0360, 0x0360, 0x0380, 0x03a0, 0x03c0, 0x03e0, 0x0400, 0x0400, 0x0420, 0x0440, 0x0440, 0x0460, 0x0480, 0x0480, 0x04a0, 0x04c0, 0x04c0, 0x04c0, 0x04e0, 0x04e0, 0x0ce0, 0x0d00, 0x0d00, 0x0d00, 0x1520, 0x1520, 0x1540, 0x1540, 0x1d40, 0x1d60, 0x1d60, 0x2580, 0x2580, 0x25a0, 0x2da0, 0x2da0, 0x2dc0, 0x35c0, 0x35e0, 0x35e0, 0x3e00, 0x3e00, 0x3e00, 0x4620, 0x4620, 0x4e40, 0x4e40, 0x4e60, 0x5660, 0x5660, 0x5e80, 0x5e80, 0x5ea0, 0x66a0, 0x66c0, 0x66c0, 0x6ec0, 0x6ee0, 0x76e0, 0x7700, 0x7f00, 0x7f00, 0x7f20, 0x8720, 0x8720, 0x8f40, 0x8f40, 0x8f40, 0x9760, 0x9760, 0x9f80, 0x9f80, 0x9f80, 0xa780, 0xa7a0, 0xafa0, 0xafa0, 0xafc0, 0xb7c0, 0xb7c0, 0xbfc0, 0xbfc0, 0xbfe0, 0xc7e0, 0xc7e0, 0xc7e0, 0xcfe0, 0xcfe0, 0xcfe0, 0xd7e0, 0xd7e0, 0xdfe0, 0xdfe0, 0xdfe0, 0xdfe0, 0xe7e0, 0xe7e0, 0xe7e0, 0xefe0, 0xefe0, 0xefe0, 0xefe0, 0xf7e0, 0xf7e0, 0xf7e0, 0xf7e0, 0xf7e0, 0xffe0, 0xffe0, 0xffe0, 0xffe0, 0xffe0, 0xffe0, 0xffe0, 0xffc0, 0xffc0, 0xffc0, 0xffa0, 0xffa0, 0xffa0, 0xff80, 0xff80, 0xff80, 0xff60, 0xff60, 0xff40, 0xff40, 0xff40, 0xff20, 0xff00, 0xff00, 0xfee0, 0xfee0, 0xfec0, 0xfec0, 0xfea0, 0xfea0, 0xfe80, 0xfe60, 0xfe60, 0xfe40, 0xfe20, 0xfe20, 0xfe00, 0xfe00, 0xfde0, 0xfdc0, 0xfda0, 0xfda0, 0xfd80, 0xfd60, 0xfd60, 0xfd40, 0xfd20, 0xfd00, 0xfd00, 0xfce0, 0xfcc0, 0xfca0, 0xfca0, 0xfc80, 0xfc60, 0xfc40, 0xfc40, 0xfc20, 0xfc00, 0xfbe0, 0xfbe0, 0xfbc0, 0xfba0, 0xfb80, 0xfb60, 0xfb60, 0xfb40, 0xfb20, 0xfb00, 0xfb00, 0xfae0, 0xfac0, 0xfaa0, 0xfaa0, 0xfa80, 0xfa60, 0xfa60, 0xfa40, 0xfa20, 0xfa00, 0xfa00, 0xf9e0, 0xf9c0, 0xf9c0, 0xf9a0, 0xf980, 0xf980, 0xf960, 0xf960, 0xf940, 0xf920, 0xf920, 0xf900, 0xf8e0, 0xf8e0, 0xf8c0, 0xf8c0, 0xf8a0, 0xf8a0, 0xf880, 0xf880, 0xf860, 0xf860, 0xf860, 0xf840, 0xf840, 0xf820, 0xf820, 0xf820, 0xf800, 0xf800, 0xf800, 0xf800 };
    45. 

  45. float floatBuffer[(256 * 2) + (256 / 4)] __attribute__((aligned(16)));
    46. 

  46. float previousM[256] __attribute__((aligned(16)));
    47. 

  47. float rootMeanSquare, lastRootMeanSquare;
    48. 

  48. int vuMeter;
    49. 

  49. #ifdef _MAY_HAVE_NEON_
    50. 

  50. unsigned int neonMode, neonDone;
    51. 

  51. int intBuffer[8] __attribute__((aligned(16)));
    52. 

  52. #endif
    53. 

  53. 

  54. float commonCoefNew;
    55. 

  55. unsigned int commonColorIndex, commonColorIndexApplied, commonTime, commonTimeLimit, commonLastTime;
    56. 

  56. 

  57. //Beat detection
    58. 

  58. #define BEAT_STATE_VALLEY 0
    59. 

  59. #define BEAT_STATE_PEAK 1
    60. 

  60. #define BEAT_MIN_RISE_THRESHOLD 40
    61. 

  61. unsigned int beatCounter, beatState, beatPeakOrValley, beatThreshold, beatDeltaMillis, beatSilenceDeltaMillis, beatSpeedBPM;
    62. 

  62. float beatFilteredInput;
    63. 

  63. 

  64. unsigned int commonUptimeDeltaMillis(unsigned int* lastTime) {
    65. 

  65. 	struct timespec t;
    66. 

  66. 	t.tv_sec = 0;
    67. 

  67. 	t.tv_nsec = 0;
    68. 

  68. 	clock_gettime(CLOCK_MONOTONIC, &t);
    69. 

  69. 	*((unsigned int*)&t) = (unsigned int)((((long)t.tv_sec) * 1000L) + (t.tv_nsec / 1000000L));
    70. 

  70. 	const unsigned int delta = *((unsigned int*)&t) - *lastTime;
    71. 

  71. 	*lastTime = *((unsigned int*)&t);
    72. 

  72. 	return ((delta >= 100) ? 100 : delta);
    73. 

  73. }
    74. 

  74. 

  75. void commonSRand() {
    76. 

  76. 	struct timespec t;
    77. 

  77. 	t.tv_sec = 0;
    78. 

  78. 	t.tv_nsec = 0;
    79. 

  79. 	clock_gettime(CLOCK_MONOTONIC, &t);
    80. 

  80. 	srand((unsigned int)t.tv_nsec);
    81. 

  81. }
    82. 

  82. 

  83. void JNICALL commonSetSpeed(JNIEnv* env, jclass clazz, int speed) {
    84. 

  84. 	switch (speed) {
    85. 

  85. 	case 1:
    86. 

  86. 		commonCoefNew = COEF_SPEED_1;
    87. 

  87. 		break;
    88. 

  88. 	case 2:
    89. 

  89. 		commonCoefNew = COEF_SPEED_2;
    90. 

  90. 		break;
    91. 

  91. 	default:
    92. 

  92. 		commonCoefNew = COEF_SPEED_0;
    93. 

  93. 		break;
    94. 

  94. 	}
    95. 

  95. }
    96. 

  96. 

  97. void JNICALL commonSetColorIndex(JNIEnv* env, jclass clazz, int jcolorIndex) {
    98. 

  98. 	commonColorIndex = jcolorIndex;
    99. 

  99. }
    100. 

  100. 

  101. int JNICALL commonCheckNeonMode(JNIEnv* env, jclass clazz) {
    102. 

  102. #ifdef _MAY_HAVE_NEON_
    103. 

  103. 	if (neonDone == 1)
    104. 

  104. 		return neonMode;
    105. 

  105. 	//based on
    106. 

  106. 	//http://code.google.com/p/webrtc/source/browse/trunk/src/system_wrappers/source/android/cpu-features.c?r=2195
    107. 

  107. 	//http://code.google.com/p/webrtc/source/browse/trunk/src/system_wrappers/source/android/cpu-features.h?r=2195
    108. 

  108. 	neonMode = 0;
    109. 

  109. 	char cpuinfo[4096];
    110. 

  110. 	int cpuinfo_len = -1;
    111. 

  111. 	int fd = open("/proc/cpuinfo", O_RDONLY);
    112. 

  112. 	if (fd >= 0) {
    113. 

  113. 		do {
    114. 

  114. 			cpuinfo_len = read(fd, cpuinfo, 4096);
    115. 

  115. 		} while (cpuinfo_len < 0 && errno == EINTR);
    116. 

  116. 		close(fd);
    117. 

  117. 		if (cpuinfo_len > 0) {
    118. 

  118. 			cpuinfo[cpuinfo_len] = 0;
    119. 

  119. 			//look for the "\nFeatures: " line
    120. 

  120. 			for (int i = cpuinfo_len - 9; i >= 0; i--) {
    121. 

  121. 				if (memcmp(cpuinfo + i, "\nFeatures", 9) == 0) {
    122. 

  122. 					i += 9;
    123. 

  123. 					while (i < cpuinfo_len && (cpuinfo[i] == ' ' || cpuinfo[i] == '\t' || cpuinfo[i] == ':'))
    124. 

  124. 						i++;
    125. 

  125. 					cpuinfo_len -= 5;
    126. 

  126. 					//now look for the " neon" feature
    127. 

  127. 					while (i <= cpuinfo_len && cpuinfo[i] != '\n') {
    128. 

  128. 						if (memcmp(cpuinfo + i, " neon", 5) == 0 ||
    129. 

  129. 							memcmp(cpuinfo + i, "\tneon", 5) == 0) {
    130. 

  130. 							neonMode = 1;
    131. 

  131. 							break;
    132. 

  132. 						}
    133. 

  133. 						i++;
    134. 

  134. 					}
    135. 

  135. 					break;
    136. 

  136. 				}
    137. 

  137. 			}
    138. 

  138. 			// __android_log_print(ANDROID_LOG_INFO, "JNI", "Neon mode: %d", neonMode);
    139. 

  139. 		}
    140. 

  140. 	}
    141. 

  141. 	neonDone = 1;
    142. 

  142. 	return neonMode;
    143. 

  143. #else
    144. 

  144. 	return 0;
    145. 

  145. #endif
    146. 

  146. }
    147. 

  147. 

  148. void JNICALL commonUpdateMultiplier(JNIEnv* env, jclass clazz, jboolean isVoice) {
    149. 

  149. 	float* const fft = floatBuffer;
    150. 

  150. 	float* const multiplier = fft + 256;
    151. 

  151. 	unsigned char* const processedData = (unsigned char*)(fft + 512);
    152. 

  152. 	rootMeanSquare = 0;
    153. 

  153. 	lastRootMeanSquare = 0;
    154. 

  154. 	vuMeter = 0;
    155. 

  155. 	beatCounter = 0;
    156. 

  156. 	beatState = BEAT_STATE_VALLEY;
    157. 

  157. 	beatPeakOrValley = 0;
    158. 

  158. 	beatThreshold = BEAT_MIN_RISE_THRESHOLD;
    159. 

  159. 	beatDeltaMillis = 0;
    160. 

  160. 	beatSilenceDeltaMillis = 0;
    161. 

  161. 	beatSpeedBPM = 0;
    162. 

  162. 	beatFilteredInput = 0;
    163. 

  163. 	if (isVoice) {
    164. 

  164. 		for (int i = 0; i < 256; i++) {
    165. 

  165. 			fft[i] = 0;
    166. 

  166. 			processedData[i] = 0;
    167. 

  167. 			previousM[i] = 0;
    168. 

  168. 			//const double d = 180.0 - exp(1.0 / (((double)i / 10000.0) + 0.187));
    169. 

  169. 			//multiplier[i] = ((d <= 1.5) ? 1.5f : (float)(d / 111.0));
    170. 

  170. 			const double d = 5.0 * (400.0 - exp(1.0 / (((double)i / 3700.0) + 0.165)));
    171. 

  171. 			multiplier[i] = ((d <= 256.0) ? 256.0f : (float)d) / 114.0f;
    172. 

  172. 			//multiplier[i] = 2.0f * expf((float)i / 128.0f);
    173. 

  173. 		}
    174. 

  174. 	} else {
    175. 

  175. 		for (int i = 0; i < 256; i++) {
    176. 

  176. 			fft[i] = 0;
    177. 

  177. 			processedData[i] = 0;
    178. 

  178. 			previousM[i] = 0;
    179. 

  179. 			//const double d = 180.0 - exp(1.0 / (((double)i / 10000.0) + 0.187));
    180. 

  180. 			//multiplier[i] = ((d <= 1.5) ? 1.5f : (float)d);
    181. 

  181. 			const double d = 5.0 * (400.0 - exp(1.0 / (((double)i / 3700.0) + 0.165)));
    182. 

  182. 			multiplier[i] = ((d <= 256.0) ? 256.0f : (float)d);
    183. 

  183. 			//multiplier[i] = 256.0f * expf((float)i / 128.0f);
    184. 

  184. 		}
    185. 

  185. 	}
    186. 

  186. }
    187. 

  187. 

  188. int JNICALL commonProcess(JNIEnv* env, jclass clazz, jbyteArray jwaveform, int opt) {
    189. 

  189. 	const unsigned int deltaMillis = commonUptimeDeltaMillis(&commonLastTime);
    190. 

  190. 	beatDeltaMillis += deltaMillis;
    191. 

  191. 	beatSilenceDeltaMillis += deltaMillis;
    192. 

  192. 	int i;
    193. 

  193. 	i = commonTime + deltaMillis;
    194. 

  194. 	while (((unsigned int)i) >= commonTimeLimit)
    195. 

  195. 		i -= commonTimeLimit;
    196. 

  196. 	commonTime = i;
    197. 

  197. 

  198. 	//fft format:
    199. 

  199. 	//index  0   1    2  3  4  5  ..... n-2        n-1
    200. 

  200. 	//       Rdc Rnyq R1 I1 R2 I2       R(n-1)/2  I(n-1)/2
    201. 

  201. 	signed char* bfft;
    202. 

  202. 	if (!(opt & IGNORE_INPUT) || (opt & BLUETOOTH_PROCESSING)) {
    203. 

  203. 		bfft = (signed char*)env->GetPrimitiveArrayCritical(jwaveform, 0);
    204. 

  204. 		if (!bfft)
    205. 

  205. 			return 0;
    206. 

  206. 

  207. 		if (!(opt & IGNORE_INPUT)) {
    208. 

  208. 			if ((opt & DATA_VUMETER))
    209. 

  209. 				rootMeanSquare = sqrtf((float)doFft((unsigned char*)bfft, opt) * (1.0f / (float)(CAPTURE_SIZE)));
    210. 

  210. 			else if ((opt & DATA_FFT))
    211. 

  211. 				doFft((unsigned char*)bfft, DATA_FFT);
    212. 

  212. 

  213. 			//*** we are not drawing/analyzing the last bin (Nyquist) ;) ***
    214. 

  214. 			bfft[1] = 0;
    215. 

  215. 		}
    216. 

  216. 	} else {
    217. 

  217. 		bfft = 0;
    218. 

  218. 	}
    219. 

  219. 

  220. 	vuMeter = 0;
    221. 

  221. 	if ((opt & DATA_VUMETER)) {
    222. 

  222. 		lastRootMeanSquare = ((rootMeanSquare > lastRootMeanSquare) ?
    223. 

  223. 								(0.5f * rootMeanSquare) + ((1.0f - 0.5f) * lastRootMeanSquare)
    224. 

  224. 								:
    225. 

  225. 								(0.075f * rootMeanSquare) + ((1.0f - 0.075f) * lastRootMeanSquare));
    226. 

  226. 		if (lastRootMeanSquare >= 1.0f) {
    227. 

  227. 			const float v = 20.0f * log10f(lastRootMeanSquare / 42.0f);
    228. 

  228. 			if (v > -20.0f) {
    229. 

  229. 				vuMeter = (int)((v + 20.0f) * 12.75f);
    230. 

  230. 				if (vuMeter > 255) vuMeter = 255;
    231. 

  231. 			}
    232. 

  232. 		}
    233. 

  233. 		if (!(opt & ~(IGNORE_INPUT | DATA_VUMETER))) {
    234. 

  234. 			if (bfft)
    235. 

  235. 				env->ReleasePrimitiveArrayCritical(jwaveform, bfft, JNI_ABORT);
    236. 

  236. 			return 0;
    237. 

  237. 		}
    238. 

  238. 	}
    239. 

  239. 

  240. 	unsigned char* processedData = (unsigned char*)(floatBuffer + 512);
    241. 

  241. 

  242. #ifdef _MAY_HAVE_NEON_
    243. 

  243. if (!neonMode) {
    244. 

  244. #endif
    245. 

  245. 	float* fft = floatBuffer;
    246. 

  246. 	const float* multiplier = floatBuffer + 256;
    247. 

  247. 

  248. 	const float coefNew = commonCoefNew * (float)deltaMillis;
    249. 

  249. 	const float coefOld = 1.0f - coefNew;
    250. 

  250. 

  251. 	if ((opt & IGNORE_INPUT)) {
    252. 

  252. 		for (i = 0; i < 256; i++) {
    253. 

  253. 			float m = previousM[i];
    254. 

  254. 			const float old = fft[i];
    255. 

  255. 			if (m < old)
    256. 

  256. 				m = (coefNew * m) + (coefOld * old);
    257. 

  257. 			fft[i] = m;
    258. 

  258. 			//v goes from 0 to 32768+ (inclusive)
    259. 

  259. 			const unsigned int v = ((unsigned int)m) >> 7;
    260. 

  260. 			processedData[i] = ((v >= 255) ? 255 : (unsigned char)v);
    261. 

  261. 		}
    262. 

  262. 	} else {
    263. 

  263. 		for (i = 0; i < 256; i++) {
    264. 

  264. 			//bfft[i] stores values from 0 to -128/127 (inclusive)
    265. 

  265. 			const int re = (int)bfft[i << 1];
    266. 

  266. 			const int im = (int)bfft[(i << 1) + 1];
    267. 

  267. 			const int amplSq = (re * re) + (im * im);
    268. 

  268. 			float m = ((amplSq < 8) ? 0.0f : (multiplier[i] * sqrtf((float)(amplSq))));
    269. 

  269. 			previousM[i] = m;
    270. 

  270. 			const float old = fft[i];
    271. 

  271. 			if (m < old)
    272. 

  272. 				m = (coefNew * m) + (coefOld * old);
    273. 

  273. 			fft[i] = m;
    274. 

  274. 			//v goes from 0 to 32768+ (inclusive)
    275. 

  275. 			const unsigned int v = ((unsigned int)m) >> 7;
    276. 

  276. 			processedData[i] = ((v >= 255) ? 255 : (unsigned char)v);
    277. 

  277. 		}
    278. 

  278. 	}
    279. 

  279. #ifdef _MAY_HAVE_NEON_
    280. 

  280. } else {
    281. 

  281. 	commonProcessNeon(bfft, deltaMillis, opt);
    282. 

  282. }
    283. 

  283. #endif
    284. 

  284. 

  285. 	if ((opt & BEAT_DETECTION)) {
    286. 

  286. 		//Beat detection (we are using a threshold of 25%)
    287. 

  287. 		//processedData[0] = DC
    288. 

  288. 		//processedData[1] = 1 * 44100/1024 = 43Hz
    289. 

  289. 		//processedData[2] = 2 * 44100/1024 = 86Hz
    290. 

  290. 		//processedData[3] = 3 * 44100/1024 = 129Hz
    291. 

  291. 		//processedData[4] = 4 * 44100/1024 = 172Hz
    292. 

  292. 		//processedData[5] = 5 * 44100/1024 = 215Hz
    293. 

  293. 		//processedData[6] = 6 * 44100/1024 = 258Hz
    294. 

  294. 		//processedData[7] = 7 * 44100/1024 = 301Hz
    295. 

  295. 		//filter again
    296. 

  296. 		beatFilteredInput = ((1.0f - 0.140625f) * beatFilteredInput) + (0.140625f * (float)processedData[(opt & BEAT_DETECTION) >> 12]);
    297. 

  297. 		const unsigned int m = (unsigned int)beatFilteredInput;
    298. 

  298. 		//__android_log_print(ANDROID_LOG_INFO, "JNI", "\t%d\t%d", (unsigned int)processedData[2], (unsigned int)processedData[3]);
    299. 

  299. 		if (beatState == BEAT_STATE_VALLEY) {
    300. 

  300. 			if (m < beatPeakOrValley) {
    301. 

  301. 				//Just update the valley
    302. 

  302. 				beatPeakOrValley = m;
    303. 

  303. 				beatThreshold = ((m * 5) >> 2); //125%
    304. 

  304. 				if (beatThreshold < BEAT_MIN_RISE_THRESHOLD)
    305. 

  305. 					beatThreshold = BEAT_MIN_RISE_THRESHOLD;
    306. 

  306. 			} else if (m >= beatThreshold && beatDeltaMillis >= 150) { //no more than 150 bpm
    307. 

  307. 				//Check if we have crossed the threshold... Beat found! :D
    308. 

  308. 				beatCounter++;
    309. 

  309. 				//Average:
    310. 

  310. 				//BPM = 60000 / beatDeltaMillis
    311. 

  311. 				//BPM / 4 = 60000 / (4 * beatDeltaMillis)
    312. 

  312. 				//BPM / 4 = 15000 / beatDeltaMillis
    313. 

  313. 				//Since beatDeltaMillis accounts only for half of the period, we use 7500 instead of 15000
    314. 

  314. 				//Let's not worry about division by 0 since beatDeltaMillis is incremented at the
    315. 

  315. 				//beginning of this function (it would take 49 days and lot of concidence to reach 0!!!)
    316. 

  316. 				beatSpeedBPM = ((beatSpeedBPM * 3) >> 2) + (7500 / beatDeltaMillis);
    317. 

  317. 				//__android_log_print(ANDROID_LOG_INFO, "JNI", "%d %d", beatCounter >> 1, beatSpeedBPM);
    318. 

  318. 				beatDeltaMillis = 0;
    319. 

  319. 				beatSilenceDeltaMillis = 0;
    320. 

  320. 				beatState = BEAT_STATE_PEAK;
    321. 

  321. 				beatPeakOrValley = m;
    322. 

  322. 				beatThreshold = ((m * 3) >> 2); //75%
    323. 

  323. 			}
    324. 

  324. 		} else {
    325. 

  325. 			if (m > beatPeakOrValley) {
    326. 

  326. 				//Just update the peak
    327. 

  327. 				beatPeakOrValley = m;
    328. 

  328. 				beatThreshold = ((m * 3) >> 2); //75%
    329. 

  329. 			} else if (m <= beatThreshold && beatDeltaMillis >= 150) {
    330. 

  330. 				//Check if we have crossed the threshold
    331. 

  331. 				beatDeltaMillis = 0;
    332. 

  332. 				beatState = BEAT_STATE_VALLEY;
    333. 

  333. 				beatPeakOrValley = m;
    334. 

  334. 				beatThreshold = ((m * 5) >> 2); //125%
    335. 

  335. 				if (beatThreshold < BEAT_MIN_RISE_THRESHOLD)
    336. 

  336.                 	beatThreshold = BEAT_MIN_RISE_THRESHOLD;
    337. 

  337. 			}
    338. 

  338. 		}
    339. 

  339. 		if (beatSilenceDeltaMillis >= 2000) {
    340. 

  340. 			beatSpeedBPM = (beatSpeedBPM >> 1); //decrease the speed by 50% after 2s without beats
    341. 

  341. 			beatSilenceDeltaMillis = 0;
    342. 

  342. 		}
    343. 

  343. 	}
    344. 

  344. 

  345. 	opt &= ~(IGNORE_INPUT | DATA_FFT | DATA_VUMETER | BEAT_DETECTION);
    346. 

  346. 	if (!opt) {
    347. 

  347. 		if (bfft)
    348. 

  348. 			env->ReleasePrimitiveArrayCritical(jwaveform, bfft, JNI_ABORT);
    349. 

  349. 		return 0;
    350. 

  350. 	}
    351. 

  351. 

  352. 

  353. 	//Bluetooth processing from here on
    354. 

  354. 

  355. 

  356. #define PACK_BIN(BIN) if ((BIN) == 0x01 || (BIN) == 0x1B) { *packet = 0x1B; packet[1] = ((unsigned char)(BIN) ^ 1); packet += 2; len += 2; } else { *packet = (unsigned char)(BIN); packet++; len++; }
    357. 

  357. #define MAX(A,B) (((A) > (B)) ? (A) : (B))
    358. 

  358. 	unsigned char* packet = (unsigned char*)bfft;
    359. 

  359. 	int len = 0, last;
    360. 

  360. 	unsigned char avg;
    361. 

  361. 	unsigned char b;
    362. 

  362. 	packet[0] = 1; //SOH - Start of Heading
    363. 

  363. 	packet[1] = (unsigned char)opt; //payload type
    364. 

  364. 	//packet[2] and packet[3] are the payload length
    365. 

  365. 	packet += 4;
    366. 

  366. 	//PACK_BIN(beatCounter);
    367. 

  367. 	//PACK_BIN(beatSpeedBPM);
    368. 

  368. 	//PACK_BIN(vuMeter);
    369. 

  369. 	//processedData stores the first 256 bins, out of the 512 captured by visualizer.getFft
    370. 

  370. 	//which represents frequencies from DC to SampleRate / 4 (roughly from 0Hz to 11025Hz for a SR of 44100Hz)
    371. 

  371. 	//
    372. 

  372. 	//the mapping algorithms used in BLUETOOTH_BINS_4, BLUETOOTH_BINS_8, BLUETOOTH_BINS_16, BLUETOOTH_BINS_32,
    373. 

  373. 	//BLUETOOTH_BINS_64 and in BLUETOOTH_BINS_128 were created empirically ;)
    374. 

  374. 	switch (opt) {
    375. 

  375. 	case BLUETOOTH_BINS_4:
    376. 

  376. 		avg = MAX(processedData[0], processedData[1]);
    377. 

  377. 		avg = MAX(avg, processedData[2]);
    378. 

  378. 		avg = MAX(avg, processedData[3]);
    379. 

  379. 		PACK_BIN(avg);
    380. 

  380. 		i = 4;
    381. 

  381. 		avg = processedData[i++];
    382. 

  382. 		for (; i < 36; i++)
    383. 

  383. 			avg = MAX(avg, processedData[i]);
    384. 

  384. 		PACK_BIN(avg);
    385. 

  385. 		avg = processedData[i++];
    386. 

  386. 		for (; i < 100; i++)
    387. 

  387. 			avg = MAX(avg, processedData[i]);
    388. 

  388. 		PACK_BIN(avg);
    389. 

  389. 		avg = processedData[i++];
    390. 

  390. 		for (; i < 228; i++)
    391. 

  391. 			avg = MAX(avg, processedData[i]);
    392. 

  392. 		PACK_BIN(avg);
    393. 

  393. 		break;
    394. 

  394. 	case BLUETOOTH_BINS_8:
    395. 

  395. 		avg = MAX(processedData[0], processedData[1]);
    396. 

  396. 		PACK_BIN(avg);
    397. 

  397. 		avg = MAX(processedData[2], processedData[3]);
    398. 

  398. 		PACK_BIN(avg);
    399. 

  399. 		i = 4;
    400. 

  400. 		avg = processedData[i++];
    401. 

  401. 		for (; i < 20; i++)
    402. 

  402. 			avg = MAX(avg, processedData[i]);
    403. 

  403. 		PACK_BIN(avg);
    404. 

  404. 		avg = processedData[i++];
    405. 

  405. 		for (; i < 36; i++)
    406. 

  406. 			avg = MAX(avg, processedData[i]);
    407. 

  407. 		PACK_BIN(avg);
    408. 

  408. 		avg = processedData[i++];
    409. 

  409. 		for (; i < 68; i++)
    410. 

  410. 			avg = MAX(avg, processedData[i]);
    411. 

  411. 		PACK_BIN(avg);
    412. 

  412. 		avg = processedData[i++];
    413. 

  413. 		for (; i < 100; i++)
    414. 

  414. 			avg = MAX(avg, processedData[i]);
    415. 

  415. 		PACK_BIN(avg);
    416. 

  416. 		avg = processedData[i++];
    417. 

  417. 		for (; i < 164; i++)
    418. 

  418. 			avg = MAX(avg, processedData[i]);
    419. 

  419. 		PACK_BIN(avg);
    420. 

  420. 		avg = processedData[i++];
    421. 

  421. 		for (; i < 228; i++)
    422. 

  422. 			avg = MAX(avg, processedData[i]);
    423. 

  423. 		PACK_BIN(avg);
    424. 

  424. 		break;
    425. 

  425. 	case BLUETOOTH_BINS_16:
    426. 

  426. 		avg = MAX(processedData[0], processedData[1]);
    427. 

  427. 		PACK_BIN(avg);
    428. 

  428. 		avg = MAX(processedData[2], processedData[3]);
    429. 

  429. 		PACK_BIN(avg);
    430. 

  430. 		for (i = 4; i < 20; i += 4) {
    431. 

  431. 			avg = MAX(processedData[i], processedData[i + 1]);
    432. 

  432. 			avg = MAX(avg, processedData[i + 2]);
    433. 

  433. 			avg = MAX(avg, processedData[i + 3]);
    434. 

  434. 			PACK_BIN(avg);
    435. 

  435. 		}
    436. 

  436. 		for (last = 28; last <= 36; last += 8) {
    437. 

  437. 			avg = processedData[i++];
    438. 

  438. 			for (; i < last; i++)
    439. 

  439. 				avg = MAX(avg, processedData[i]);
    440. 

  440. 			PACK_BIN(avg);
    441. 

  441. 		}
    442. 

  442. 		for (last = 52; last <= 100; last += 16) {
    443. 

  443. 			avg = processedData[i++];
    444. 

  444. 			for (; i < last; i++)
    445. 

  445. 				avg = MAX(avg, processedData[i]);
    446. 

  446. 			PACK_BIN(avg);
    447. 

  447. 		}
    448. 

  448. 		for (last = 132; last <= 228; last += 32) {
    449. 

  449. 			avg = processedData[i++];
    450. 

  450. 			for (; i < last; i++)
    451. 

  451. 				avg = MAX(avg, processedData[i]);
    452. 

  452. 			PACK_BIN(avg);
    453. 

  453. 		}
    454. 

  454. 		break;
    455. 

  455. 	case BLUETOOTH_BINS_32:
    456. 

  456. 		b = processedData[0];
    457. 

  457. 		PACK_BIN(b);
    458. 

  458. 		b = processedData[1];
    459. 

  459. 		PACK_BIN(b);
    460. 

  460. 		b = processedData[2];
    461. 

  461. 		PACK_BIN(b);
    462. 

  462. 		b = processedData[3];
    463. 

  463. 		PACK_BIN(b);
    464. 

  464. 		for (i = 4; i < 20; i += 2) {
    465. 

  465. 			avg = MAX(processedData[i], processedData[i + 1]);
    466. 

  466. 			PACK_BIN(avg);
    467. 

  467. 		}
    468. 

  468. 		for (; i < 36; i += 4) {
    469. 

  469. 			avg = MAX(processedData[i], processedData[i + 1]);
    470. 

  470. 			avg = MAX(avg, processedData[i + 2]);
    471. 

  471. 			avg = MAX(avg, processedData[i + 3]);
    472. 

  472. 			PACK_BIN(avg);
    473. 

  473. 		}
    474. 

  474. 		for (last = 44; last <= 100; last += 8) {
    475. 

  475. 			avg = processedData[i++];
    476. 

  476. 			for (; i < last; i++)
    477. 

  477. 				avg = MAX(avg, processedData[i]);
    478. 

  478. 			PACK_BIN(avg);
    479. 

  479. 		}
    480. 

  480. 		for (last = 116; last <= 228; last += 16) {
    481. 

  481. 			avg = processedData[i++];
    482. 

  482. 			for (; i < last; i++)
    483. 

  483. 				avg = MAX(avg, processedData[i]);
    484. 

  484. 			PACK_BIN(avg);
    485. 

  485. 		}
    486. 

  486. 		break;
    487. 

  487. 	case BLUETOOTH_BINS_64:
    488. 

  488. 		for (i = 0; i < 20; i++) {
    489. 

  489. 			b = processedData[i];
    490. 

  490. 			PACK_BIN(b);
    491. 

  491. 		}
    492. 

  492. 		for (; i < 36; i += 2) {
    493. 

  493. 			avg = MAX(processedData[i], processedData[i + 1]);
    494. 

  494. 			PACK_BIN(avg);
    495. 

  495. 		}
    496. 

  496. 		for (; i < 132; i += 4) {
    497. 

  497. 			avg = MAX(processedData[i], processedData[i + 1]);
    498. 

  498. 			avg = MAX(avg, processedData[i + 2]);
    499. 

  499. 			avg = MAX(avg, processedData[i + 3]);
    500. 

  500. 			PACK_BIN(avg);
    501. 

  501. 		}
    502. 

  502. 		for (last = 140; last <= 228; last += 8) {
    503. 

  503. 			avg = processedData[i++];
    504. 

  504. 			for (; i < last; i++)
    505. 

  505. 				avg = MAX(avg, processedData[i]);
    506. 

  506. 			PACK_BIN(avg);
    507. 

  507. 		}
    508. 

  508. 		break;
    509. 

  509. 	case BLUETOOTH_BINS_128:
    510. 

  510. 		for (i = 0; i < 36; i++) {
    511. 

  511. 			b = processedData[i];
    512. 

  512. 			PACK_BIN(b);
    513. 

  513. 		}
    514. 

  514. 		for (; i < 184; i += 2) {
    515. 

  515. 			avg = MAX(processedData[i], processedData[i + 1]);
    516. 

  516. 			PACK_BIN(avg);
    517. 

  517. 		}
    518. 

  518. 		for (; i < 252; i += 4) {
    519. 

  519. 			avg = MAX(processedData[i], processedData[i + 1]);
    520. 

  520. 			avg = MAX(avg, processedData[i + 2]);
    521. 

  521. 			avg = MAX(avg, processedData[i + 3]);
    522. 

  522. 			PACK_BIN(avg);
    523. 

  523. 		}
    524. 

  524. 		break;
    525. 

  525. 	case BLUETOOTH_BINS_256:
    526. 

  526. 		for (i = 0; i < 256; i++) {
    527. 

  527. 			b = processedData[i];
    528. 

  528. 			PACK_BIN(b);
    529. 

  529. 		}
    530. 

  530. 		break;
    531. 

  531. 	default:
    532. 

  532. 		env->ReleasePrimitiveArrayCritical(jwaveform, bfft, JNI_ABORT);
    533. 

  533. 		return 0;
    534. 

  534. 	}
    535. 

  535. #undef PACK_BIN
    536. 

  536. 	//fill in the payload length
    537. 

  537. 	((unsigned char*)bfft)[2] = (len & 0x7F) << 1; //lower 7 bits, left shifted by 1
    538. 

  538. 	((unsigned char*)bfft)[3] = (len >> 6) & 0xFE; //upper 7 bits, left shifted by 1
    539. 

  539. 	*packet = 4; //EOT - End of Transmission
    540. 

  540. 	env->ReleasePrimitiveArrayCritical(jwaveform, bfft, 0);
    541. 

  541. 	return len + 5;
    542. 

  542. }
    543. 

  543.