summaryrefslogtreecommitdiff
path: root/3rdparty/portaudio/qa/loopback/src/write_wav.c
blob: aa5ee2146af1a83467b6dd69fcced05014832f76 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
/*
 * PortAudio Portable Real-Time Audio Library
 * Latest Version at: http://www.portaudio.com
 *
 * Copyright (c) 1999-2010 Phil Burk and Ross Bencina
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files
 * (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge,
 * publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/*
 * The text above constitutes the entire PortAudio license; however,
 * the PortAudio community also makes the following non-binding requests:
 *
 * Any person wishing to distribute modifications to the Software is
 * requested to send the modifications to the original developer so that
 * they can be incorporated into the canonical version. It is also
 * requested that these non-binding requests be included along with the
 * license above.
 */

/**
  * Very simple WAV file writer for saving captured audio.
  */

#include <stdio.h>
#include <stdlib.h>
#include "write_wav.h"


/* Write long word data to a little endian format byte array. */
static void WriteLongLE( unsigned char **addrPtr, unsigned long data )
{
    unsigned char *addr = *addrPtr;
    *addr++ =  (unsigned char) data;
    *addr++ =  (unsigned char) (data>>8);
    *addr++ =  (unsigned char) (data>>16);
    *addr++ =  (unsigned char) (data>>24);
    *addrPtr = addr;
}

/* Write short word data to a little endian format byte array. */
static void WriteShortLE( unsigned char **addrPtr,  unsigned short data )
{
    unsigned char *addr = *addrPtr;
    *addr++ =  (unsigned char) data;
    *addr++ =  (unsigned char) (data>>8);
    *addrPtr = addr;
}

/* Write IFF ChunkType data to a byte array. */
static void WriteChunkType( unsigned char **addrPtr, unsigned long cktyp )
{
    unsigned char *addr = *addrPtr;
    *addr++ =  (unsigned char) (cktyp>>24);
    *addr++ =  (unsigned char) (cktyp>>16);
    *addr++ =  (unsigned char) (cktyp>>8);
    *addr++ =  (unsigned char) cktyp;
    *addrPtr = addr;
}

#define WAV_HEADER_SIZE (4 + 4 + 4 + /* RIFF+size+WAVE */ \
        4 + 4 + 16 + /* fmt chunk */ \
        4 + 4 ) /* data chunk */


/*********************************************************************************
 * Open named file and write WAV header to the file.
 * The header includes the DATA chunk type and size.
 * Returns number of bytes written to file or negative error code.
 */
long Audio_WAV_OpenWriter( WAV_Writer *writer, const char *fileName, int frameRate, int samplesPerFrame )
{
    unsigned int  bytesPerSecond;
    unsigned char header[ WAV_HEADER_SIZE ];
    unsigned char *addr = header;
    int numWritten;

    writer->dataSize = 0;
    writer->dataSizeOffset = 0;

    writer->fid = fopen( fileName, "wb" );
    if( writer->fid == NULL )
    {
        return -1;
    }

/* Write RIFF header. */
    WriteChunkType( &addr, RIFF_ID );

/* Write RIFF size as zero for now. Will patch later. */
    WriteLongLE( &addr, 0 );

/* Write WAVE form ID. */
    WriteChunkType( &addr, WAVE_ID );

/* Write format chunk based on AudioSample structure. */
    WriteChunkType( &addr, FMT_ID );
    WriteLongLE( &addr, 16 );
    WriteShortLE( &addr, WAVE_FORMAT_PCM );
        bytesPerSecond = frameRate * samplesPerFrame * sizeof( short);
    WriteShortLE( &addr, (short) samplesPerFrame );
    WriteLongLE( &addr, frameRate );
    WriteLongLE( &addr,  bytesPerSecond );
    WriteShortLE( &addr, (short) (samplesPerFrame * sizeof( short)) ); /* bytesPerBlock */
    WriteShortLE( &addr, (short) 16 ); /* bits per sample */

/* Write ID and size for 'data' chunk. */
    WriteChunkType( &addr, DATA_ID );
/* Save offset so we can patch it later. */
    writer->dataSizeOffset = (int) (addr - header);
    WriteLongLE( &addr, 0 );

    numWritten = fwrite( header, 1, sizeof(header), writer->fid );
    if( numWritten != sizeof(header) ) return -1;

    return (int) numWritten;
}

/*********************************************************************************
 * Write to the data chunk portion of a WAV file.
 * Returns bytes written or negative error code.
 */
long Audio_WAV_WriteShorts( WAV_Writer *writer,
        short *samples,
        int numSamples
        )
{
    unsigned char buffer[2];
    unsigned char *bufferPtr;
    int i;
    short *p = samples;
    int numWritten;
    int bytesWritten;
    if( numSamples <= 0 )
    {
        return -1;
    }

    for( i=0; i<numSamples; i++ )
    {
        bufferPtr = buffer;
        WriteShortLE( &bufferPtr, *p++ );
        numWritten = fwrite( buffer, 1, sizeof( buffer), writer->fid );
        if( numWritten != sizeof(buffer) ) return -1;
    }
    bytesWritten = numSamples * sizeof(short);
    writer->dataSize += bytesWritten;
    return (int) bytesWritten;
}

/*********************************************************************************
 * Close WAV file.
 * Update chunk sizes so it can be read by audio applications.
 */
long Audio_WAV_CloseWriter( WAV_Writer *writer )
{
    unsigned char buffer[4];
    unsigned char *bufferPtr;
    int numWritten;
    int riffSize;

    /* Go back to beginning of file and update DATA size */
    int result = fseek( writer->fid, writer->dataSizeOffset, SEEK_SET );
    if( result < 0 ) return result;

    bufferPtr = buffer;
    WriteLongLE( &bufferPtr, writer->dataSize );
    numWritten = fwrite( buffer, 1, sizeof( buffer), writer->fid );
    if( numWritten != sizeof(buffer) ) return -1;

    /* Update RIFF size */
    result = fseek( writer->fid, 4, SEEK_SET );
    if( result < 0 ) return result;

    riffSize = writer->dataSize + (WAV_HEADER_SIZE - 8);
    bufferPtr = buffer;
    WriteLongLE( &bufferPtr, riffSize );
    numWritten = fwrite( buffer, 1, sizeof( buffer), writer->fid );
    if( numWritten != sizeof(buffer) ) return -1;

    fclose( writer->fid );
    writer->fid = NULL;
    return writer->dataSize;
}

/*********************************************************************************
 * Simple test that write a sawtooth waveform to a file.
 */
#if 0
int main( void )
{
    int i;
    WAV_Writer writer;
    int result;
#define NUM_SAMPLES  (200)
    short data[NUM_SAMPLES];
    short saw = 0;

    for( i=0; i<NUM_SAMPLES; i++ )
    {
        data[i] = saw;
        saw += 293;
    }


    result =  Audio_WAV_OpenWriter( &writer, "rendered_midi.wav", 44100, 1 );
    if( result < 0 ) goto error;

    for( i=0; i<15; i++ )
    {
        result =  Audio_WAV_WriteShorts( &writer, data, NUM_SAMPLES );
        if( result < 0 ) goto error;
    }

    result =  Audio_WAV_CloseWriter( &writer );
    if( result < 0 ) goto error;


    return 0;

error:
    printf("ERROR: result = %d\n", result );
    return result;
}
#endif