diff src/portaudio_20140130/examples/paex_wmme_ac3.c @ 124:e3d5853d5918

Current stable PortAudio source

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/portaudio_20140130/examples/paex_wmme_ac3.c	Tue Oct 18 13:11:05 2016 +0100
@@ -0,0 +1,222 @@
+/** @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 <[e-mail]>
+*/
+/*
+ * $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 i;
+    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 occured while using the portaudio stream\n" );
+    fprintf( stderr, "Error number: %d\n", err );
+    fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
+    return err;
+}
+