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|
/*
* libopenmpt_example_c_pipe.c
* ---------------------------
* Purpose: libopenmpt C API simple pipe example
* Notes : This example writes raw 48000Hz / stereo / 16bit native endian PCM data to stdout.
* Authors: OpenMPT Devs
* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
*/
/*
* Usage: cat SOMEMODULE | libopenmpt_example_c_pipe | aplay --file-type raw --format=dat
*/
#include <memory.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <libopenmpt/libopenmpt.h>
#include <libopenmpt/libopenmpt_stream_callbacks_fd.h>
#if defined( __DJGPP__ )
#include <crt0.h>
#endif /* __DJGPP__ */
#define BUFFERSIZE 480
#define SAMPLERATE 48000
static void libopenmpt_example_logfunc( const char * message, void * userdata ) {
(void)userdata;
if ( message ) {
fprintf( stderr, "openmpt: %s\n", message );
}
}
static int libopenmpt_example_errfunc( int error, void * userdata ) {
(void)userdata;
(void)error;
return OPENMPT_ERROR_FUNC_RESULT_DEFAULT & ~OPENMPT_ERROR_FUNC_RESULT_LOG;
}
static void libopenmpt_example_print_error( const char * func_name, int mod_err, const char * mod_err_str ) {
if ( !func_name ) {
func_name = "unknown function";
}
if ( mod_err == OPENMPT_ERROR_OUT_OF_MEMORY ) {
mod_err_str = openmpt_error_string( mod_err );
if ( !mod_err_str ) {
fprintf( stderr, "Error: %s\n", "OPENMPT_ERROR_OUT_OF_MEMORY" );
} else {
fprintf( stderr, "Error: %s\n", mod_err_str );
openmpt_free_string( mod_err_str );
mod_err_str = NULL;
}
} else {
if ( !mod_err_str ) {
mod_err_str = openmpt_error_string( mod_err );
if ( !mod_err_str ) {
fprintf( stderr, "Error: %s failed.\n", func_name );
} else {
fprintf( stderr, "Error: %s failed: %s\n", func_name, mod_err_str );
}
openmpt_free_string( mod_err_str );
mod_err_str = NULL;
}
fprintf( stderr, "Error: %s failed: %s\n", func_name, mod_err_str );
}
}
static ssize_t xwrite( int fd, const void * buffer, size_t size ) {
size_t written = 0;
ssize_t retval = 0;
while ( written < size ) {
retval = write( fd, (const char *)buffer + written, size - written );
if ( retval < 0 ) {
if ( errno != EINTR ) {
break;
}
retval = 0;
}
written += retval;
}
return written;
}
static int16_t buffer[BUFFERSIZE * 2];
#if defined( __DJGPP__ )
/* clang-format off */
int _crt0_startup_flags = 0
| _CRT0_FLAG_NONMOVE_SBRK /* force interrupt compatible allocation */
| _CRT0_DISABLE_SBRK_ADDRESS_WRAP /* force NT compatible allocation */
| _CRT0_FLAG_LOCK_MEMORY /* lock all code and data at program startup */
| 0;
/* clang-format on */
#endif /* __DJGPP__ */
#if ( defined( _WIN32 ) || defined( WIN32 ) ) && ( defined( _UNICODE ) || defined( UNICODE ) )
#if defined( __clang__ ) && !defined( _MSC_VER )
int wmain( int argc, wchar_t * argv[] );
#endif
int wmain( int argc, wchar_t * argv[] ) {
#else
int main( int argc, char * argv[] ) {
#endif
#if defined( __DJGPP__ )
/* clang-format off */
_crt0_startup_flags &= ~_CRT0_FLAG_LOCK_MEMORY; /* disable automatic locking for all further memory allocations */
/* clang-format on */
#endif /* __DJGPP__ */
int result = 0;
openmpt_module * mod = 0;
int mod_err = OPENMPT_ERROR_OK;
const char * mod_err_str = NULL;
size_t count = 0;
size_t written = 0;
(void)argv;
if ( argc != 1 ) {
fprintf( stderr, "Error: %s\n", "Wrong invocation. Use 'libopenmpt_example_c_pipe' and connect stdin and stdout." );
goto fail;
}
mod = openmpt_module_create2( openmpt_stream_get_fd_callbacks(), (void *)(uintptr_t)STDIN_FILENO, &libopenmpt_example_logfunc, NULL, &libopenmpt_example_errfunc, NULL, &mod_err, &mod_err_str, NULL );
if ( !mod ) {
libopenmpt_example_print_error( "openmpt_module_create2()", mod_err, mod_err_str );
openmpt_free_string( mod_err_str );
mod_err_str = NULL;
goto fail;
}
while ( 1 ) {
openmpt_module_error_clear( mod );
count = openmpt_module_read_interleaved_stereo( mod, SAMPLERATE, BUFFERSIZE, buffer );
mod_err = openmpt_module_error_get_last( mod );
mod_err_str = openmpt_module_error_get_last_message( mod );
if ( mod_err != OPENMPT_ERROR_OK ) {
libopenmpt_example_print_error( "openmpt_module_read_interleaved_stereo()", mod_err, mod_err_str );
openmpt_free_string( mod_err_str );
mod_err_str = NULL;
}
if ( count == 0 ) {
break;
}
written = xwrite( STDOUT_FILENO, buffer, count * 2 * sizeof( int16_t ) );
if ( written == 0 ) {
fprintf( stderr, "Error: %s\n", "write() failed." );
goto fail;
}
}
result = 0;
goto cleanup;
fail:
result = 1;
cleanup:
if ( mod ) {
openmpt_module_destroy( mod );
mod = 0;
}
return result;
}
|
