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/*
* openmpt123_allegro42.hpp
* ------------------------
* Purpose: libopenmpt command line player
* Notes : (currently none)
* Authors: OpenMPT Devs
* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
*/
#ifndef OPENMPT123_ALLEGRO42_HPP
#define OPENMPT123_ALLEGRO42_HPP
#include "openmpt123_config.hpp"
#include "openmpt123.hpp"
#if defined(MPT_WITH_ALLEGRO42)
#include <allegro.h>
namespace openmpt123 {
struct allegro42_exception : public exception {
static std::string error_to_string() {
try {
return allegro_error ? std::string( allegro_error ) : std::string();
} catch ( const std::bad_alloc & ) {
return std::string();
}
}
allegro42_exception()
: exception( error_to_string() )
{
}
};
class allegro42_raii {
public:
allegro42_raii() {
if ( allegro_init() != 0 ) {
throw allegro42_exception();
}
}
~allegro42_raii() {
allegro_exit();
}
};
class allegro42_sound_raii {
public:
allegro42_sound_raii() {
if ( install_sound( DIGI_AUTODETECT, MIDI_NONE, NULL ) != 0 ) {
throw allegro42_exception();
}
if ( digi_card == DIGI_NONE ) {
remove_sound();
throw exception( "no audio device found" );
}
}
~allegro42_sound_raii() {
remove_sound();
}
};
class allegro42_stream_raii : public write_buffers_polling_wrapper_int {
private:
allegro42_raii allegro;
allegro42_sound_raii allegro_sound;
AUDIOSTREAM * stream;
std::size_t bits;
std::size_t channels;
std::uint32_t period_frames;
private:
std::uint32_t round_up_power2(std::uint32_t x)
{
std::uint32_t result = 1;
while ( result < x ) {
result *= 2;
}
return result;
}
public:
allegro42_stream_raii( commandlineflags & flags, std::ostream & log )
: write_buffers_polling_wrapper_int(flags)
, stream(NULL)
, bits(16)
, channels(flags.channels)
, period_frames(1024)
{
if ( flags.use_float ) {
throw exception( "floating point is unsupported" );
}
if ( ( flags.channels != 1 ) && ( flags.channels != 2 ) ) {
throw exception( "only mono or stereo supported" );
}
if ( flags.buffer == default_high ) {
flags.buffer = 1024 * 2 * 1000 / flags.samplerate;
} else if ( flags.buffer == default_low ) {
flags.buffer = 512 * 2 * 1000 / flags.samplerate;
}
if ( flags.period == default_high ) {
flags.period = 1024 / 2 * 1000 / flags.samplerate;
} else if ( flags.period == default_low ) {
flags.period = 512 / 2 * 1000 / flags.samplerate;
}
flags.apply_default_buffer_sizes();
period_frames = round_up_power2( ( flags.buffer * flags.samplerate ) / ( 1000 * 2 ) );
set_queue_size_frames( period_frames );
if ( flags.verbose ) {
log << "Allegro-4.2:" << std::endl;
log << " latency: " << flags.buffer << std::endl;
log << " period: " << flags.period << std::endl;
log << " frames per buffer: " << period_frames << std::endl;
log << " ui redraw: " << flags.ui_redraw_interval << std::endl;
}
stream = play_audio_stream( period_frames, 16, ( flags.channels > 1 ) ? TRUE : FALSE, flags.samplerate, 255, 128 );
if ( !stream ) {
bits = 8;
stream = play_audio_stream( period_frames, 8, ( flags.channels > 1 ) ? TRUE : FALSE, flags.samplerate, 255, 128 );
if ( !stream ) {
throw allegro42_exception();
}
}
}
~allegro42_stream_raii() {
if ( stream ) {
stop_audio_stream( stream );
stream = NULL;
}
}
public:
bool forward_queue() override {
void * p = get_audio_stream_buffer( stream );
if ( !p ) {
return false;
}
for ( std::size_t frame = 0; frame < period_frames; ++frame ) {
for ( std::size_t channel = 0; channel < channels; ++channel ) {
std::int16_t sample = pop_queue();
if ( bits == 8 ) {
std::uint8_t u8sample = ( static_cast<std::uint16_t>( sample ) + 0x8000u ) >> 8;
std::memcpy( reinterpret_cast<unsigned char *>( p ) + ( ( ( frame * channels ) + channel ) * sizeof( std::uint8_t ) ), &u8sample, sizeof( std::uint8_t ) );
} else {
std::uint16_t u16sample = static_cast<std::uint16_t>( sample ) + 0x8000u;
std::memcpy( reinterpret_cast<unsigned char *>( p ) + ( ( ( frame * channels ) + channel ) * sizeof( std::uint16_t ) ), &u16sample, sizeof( std::uint16_t ) );
}
}
}
free_audio_stream_buffer( stream );
return true;
}
bool unpause() override {
voice_start( stream->voice );
return true;
}
bool pause() override {
voice_stop( stream->voice );
return true;
}
bool sleep( int ms ) override {
rest( ms );
return true;
}
};
static std::string show_allegro42_devices( std::ostream & /* log */ ) {
std::ostringstream devices;
devices << " allegro42:" << std::endl;
devices << " " << "0" << ": Default Device" << std::endl;
return devices.str();
}
} // namespace openmpt123
#endif // MPT_WITH_ALLEGRO42
#endif // OPENMPT123_ALLEGRO42_HPP
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