File size: 7,228 Bytes
83418c6
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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
/** @file paex_wmme_ac3.c
    @ingroup examples_src
    @brief Use WMME-specific interface to send raw AC3 data to a S/PDIF output.
    @author Ross Bencina <[email protected]>
*/
/*
 * $Id: $
 * Portable Audio I/O Library
 * Windows MME ac3 sound output test
 *
 * Copyright (c) 2009 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.
 */

#include <stdio.h>
#include <math.h>

#include <windows.h>    /* required when using pa_win_wmme.h */
#include <mmsystem.h>   /* required when using pa_win_wmme.h */

#include "portaudio.h"
#include "pa_win_wmme.h"

#define NUM_SECONDS         (20)
#define SAMPLE_RATE         (48000)
#define FRAMES_PER_BUFFER   (64)

#ifndef M_PI
#define M_PI  (3.14159265)
#endif

#define TABLE_SIZE          (100)

#define CHANNEL_COUNT       (2)



typedef struct
{
    short *buffer;
    int bufferSampleCount;
    int playbackIndex;
}
paTestData;

/* This routine will be called by the PortAudio engine when audio is needed.
** It may called at interrupt level on some machines so don't do anything
** that could mess up the system like calling malloc() or free().
*/
static int patestCallback( const void *inputBuffer, void *outputBuffer,
                            unsigned long framesPerBuffer,
                            const PaStreamCallbackTimeInfo* timeInfo,
                            PaStreamCallbackFlags statusFlags,
                            void *userData )
{
    paTestData *data = (paTestData*)userData;
    short *out = (short*)outputBuffer;
    unsigned long i,j;

    (void) timeInfo; /* Prevent unused variable warnings. */
    (void) statusFlags;
    (void) inputBuffer;

    /* stream out contents of data->buffer looping at end */

    for( i=0; i<framesPerBuffer; i++ )
    {
        for( j = 0; j < CHANNEL_COUNT; ++j ){
            *out++ = data->buffer[ data->playbackIndex++ ];

            if( data->playbackIndex >= data->bufferSampleCount )
                data->playbackIndex = 0; /* loop at end of buffer */
        }
    }

    return paContinue;
}

/*******************************************************************/
int main(int argc, char* argv[])
{
    PaStreamParameters outputParameters;
    PaWinMmeStreamInfo wmmeStreamInfo;
    PaStream *stream;
    PaError err;
    paTestData data;
    int deviceIndex;
    FILE *fp;
    const char *fileName = "c:\\test_48k.ac3.spdif";
    data.buffer = NULL;

    printf("usage: patest_wmme_ac3 fileName [paDeviceIndex]\n");
    printf("**IMPORTANT*** The provided file must include the spdif preamble at the start of every AC-3 frame. Using a normal ac3 file won't work.\n");
    printf("PortAudio Test: output a raw spdif ac3 stream. SR = %d, BufSize = %d, Chans = %d\n",
            SAMPLE_RATE, FRAMES_PER_BUFFER, CHANNEL_COUNT);


    if( argc >= 2 )
        fileName = argv[1];

    printf( "reading spdif ac3 raw stream file %s\n", fileName );

    fp = fopen( fileName, "rb" );
    if( !fp ){
        fprintf( stderr, "error opening spdif ac3 file.\n" );
        return -1;
    }
    /* get file size */
    fseek( fp, 0, SEEK_END );
    data.bufferSampleCount = ftell( fp ) / sizeof(short);
    fseek( fp, 0, SEEK_SET );

    /* allocate buffer, read the whole file into memory */
    data.buffer = (short*)malloc( data.bufferSampleCount * sizeof(short) );
    if( !data.buffer ){
        fprintf( stderr, "error allocating buffer.\n" );
        return -1;
    }

    fread( data.buffer, sizeof(short), data.bufferSampleCount, fp );
    fclose( fp );

    data.playbackIndex = 0;

    err = Pa_Initialize();
    if( err != paNoError ) goto error;

    deviceIndex = Pa_GetHostApiInfo( Pa_HostApiTypeIdToHostApiIndex( paMME ) )->defaultOutputDevice;
    if( argc >= 3 ){
        sscanf( argv[1], "%d", &deviceIndex );
    }

    printf( "using device id %d (%s)\n", deviceIndex, Pa_GetDeviceInfo(deviceIndex)->name );


    outputParameters.device = deviceIndex;
    outputParameters.channelCount = CHANNEL_COUNT;
    outputParameters.sampleFormat = paInt16; /* IMPORTANT must use paInt16 for WMME AC3 */
    outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
    outputParameters.hostApiSpecificStreamInfo = NULL;

    wmmeStreamInfo.size = sizeof(PaWinMmeStreamInfo);
    wmmeStreamInfo.hostApiType = paMME;
    wmmeStreamInfo.version = 1;
    wmmeStreamInfo.flags = paWinMmeWaveFormatDolbyAc3Spdif;
    outputParameters.hostApiSpecificStreamInfo = &wmmeStreamInfo;


    if( Pa_IsFormatSupported( 0, &outputParameters, SAMPLE_RATE ) == paFormatIsSupported  ){
        printf( "Pa_IsFormatSupported reports device will support %d channels.\n", CHANNEL_COUNT );
    }else{
        printf( "Pa_IsFormatSupported reports device will not support %d channels.\n", CHANNEL_COUNT );
    }

    err = Pa_OpenStream(
              &stream,
              NULL, /* no input */
              &outputParameters,
              SAMPLE_RATE,
              FRAMES_PER_BUFFER,
              0,
              patestCallback,
              &data );
    if( err != paNoError ) goto error;

    err = Pa_StartStream( stream );
    if( err != paNoError ) goto error;

    printf("Play for %d seconds.\n", NUM_SECONDS );
    Pa_Sleep( NUM_SECONDS * 1000 );

    err = Pa_StopStream( stream );
    if( err != paNoError ) goto error;

    err = Pa_CloseStream( stream );
    if( err != paNoError ) goto error;

    Pa_Terminate();
    free( data.buffer );
    printf("Test finished.\n");

    return err;
error:
    Pa_Terminate();
    free( data.buffer );

    fprintf( stderr, "An error occurred while using the portaudio stream\n" );
    fprintf( stderr, "Error number: %d\n", err );
    fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
    return err;
}