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1 /* This file was written by Bill Cox in 2010, and is licensed under the Apache
2    2.0 license.
3 
4    This file is meant as a simple example for how to use libsonic.  It is also a
5    useful utility on it's own, which can speed up or slow down wav files, change
6    pitch, and scale volume. */
7 
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include "sonic.h"
12 #include "wave.h"
13 
14 #define BUFFER_SIZE 2048
15 
16 /* Run sonic. */
runSonic(waveFile inFile,waveFile outFile,float speed,float pitch,float rate,float volume,int emulateChordPitch,int quality,int sampleRate,int numChannels)17 static void runSonic(
18     waveFile inFile,
19     waveFile outFile,
20     float speed,
21     float pitch,
22     float rate,
23     float volume,
24     int emulateChordPitch,
25     int quality,
26     int sampleRate,
27     int numChannels)
28 {
29     sonicStream stream = sonicCreateStream(sampleRate, numChannels);
30     short inBuffer[BUFFER_SIZE], outBuffer[BUFFER_SIZE];
31     int samplesRead, samplesWritten;
32 
33     sonicSetSpeed(stream, speed);
34     sonicSetPitch(stream, pitch);
35     sonicSetRate(stream, rate);
36     sonicSetVolume(stream, volume);
37     sonicSetChordPitch(stream, emulateChordPitch);
38     sonicSetQuality(stream, quality);
39     do {
40         samplesRead = readFromWaveFile(inFile, inBuffer, BUFFER_SIZE/numChannels);
41 	if(samplesRead == 0) {
42 	    sonicFlushStream(stream);
43 	} else {
44 	    sonicWriteShortToStream(stream, inBuffer, samplesRead);
45 	}
46 	do {
47 	    samplesWritten = sonicReadShortFromStream(stream, outBuffer,
48 	        BUFFER_SIZE/numChannels);
49 	    if(samplesWritten > 0) {
50 		writeToWaveFile(outFile, outBuffer, samplesWritten);
51 	    }
52 	} while(samplesWritten > 0);
53     } while(samplesRead > 0);
54     sonicDestroyStream(stream);
55 }
56 
57 /* Print the usage. */
usage(void)58 static void usage(void)
59 {
60     fprintf(stderr, "Usage: sonic [OPTION]... infile outfile\n"
61         "    -c         -- Modify pitch by emulating vocal chords vibrating\n"
62 	"                  faster or slower.\n"
63         "    -p pitch   -- Set pitch scaling factor.  1.3 means 30%% higher.\n"
64         "    -q         -- Disable speed-up heuristics.  May increase quality.\n"
65         "    -r rate    -- Set playback rate.  2.0 means 2X faster, and 2X pitch.\n"
66         "    -s speed   -- Set speed up factor.  2.0 means 2X faster.\n"
67 	"    -v volume  -- Scale volume by a constant factor.\n");
68     exit(1);
69 }
70 
main(int argc,char ** argv)71 int main(
72     int argc,
73     char **argv)
74 {
75     waveFile inFile, outFile;
76     char *inFileName, *outFileName;
77     float speed = 1.0f;
78     float pitch = 1.0f;
79     float rate = 1.0f;
80     float volume = 1.0f;
81     int emulateChordPitch = 0;
82     int quality = 0;
83     int sampleRate, numChannels;
84     int xArg = 1;
85 
86     while(xArg < argc && *(argv[xArg]) == '-') {
87 	if(!strcmp(argv[xArg], "-c")) {
88 	    emulateChordPitch = 1;
89 	    printf("Scaling pitch linearly.\n");
90 	} else if(!strcmp(argv[xArg], "-p")) {
91 	    xArg++;
92 	    if(xArg < argc) {
93 	        pitch = atof(argv[xArg]);
94                 printf("Setting pitch to %0.2fX\n", pitch);
95 	    }
96 	} else if(!strcmp(argv[xArg], "-q")) {
97 	    quality = 1;
98 	    printf("Disabling speed-up heuristics\n");
99 	} else if(!strcmp(argv[xArg], "-r")) {
100 	    xArg++;
101 	    if(xArg < argc) {
102 	        rate = atof(argv[xArg]);
103                 printf("Setting rate to %0.2fX\n", rate);
104 	    }
105 	} else if(!strcmp(argv[xArg], "-s")) {
106 	    xArg++;
107 	    if(xArg < argc) {
108 	        speed = atof(argv[xArg]);
109                 printf("Setting speed to %0.2fX\n", speed);
110 	    }
111 	} else if(!strcmp(argv[xArg], "-v")) {
112 	    xArg++;
113 	    if(xArg < argc) {
114 	        volume = atof(argv[xArg]);
115                 printf("Setting volume to %0.2f\n", volume);
116 	    }
117 	}
118 	xArg++;
119     }
120     if(argc - xArg != 2) {
121 	usage();
122     }
123     inFileName = argv[xArg];
124     outFileName = argv[xArg + 1];
125     inFile = openInputWaveFile(inFileName, &sampleRate, &numChannels);
126     if(inFile == NULL) {
127 	return 1;
128     }
129     outFile = openOutputWaveFile(outFileName, sampleRate, numChannels);
130     if(outFile == NULL) {
131 	closeWaveFile(inFile);
132 	return 1;
133     }
134     runSonic(inFile, outFile, speed, pitch, rate, volume, emulateChordPitch, quality,
135         sampleRate, numChannels);
136     closeWaveFile(inFile);
137     closeWaveFile(outFile);
138     return 0;
139 }
140