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/*******************************************************************************
* Goggles Audio Player Library *
********************************************************************************
* Copyright (C) 2020-2021 by Sander Jansen. All Rights Reserved *
* --- *
* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see http://www.gnu.org/licenses. *
********************************************************************************/
#include "ap_defs.h"
#include "ap_convert.h"
#include "ap_crossfader.h"
namespace ap {
// Start recording samples at stream position
void CrossFader::start_recording(AudioFormat & fmt, FXuint stream, FXlong stream_position, FXlong stream_length) {
GM_DEBUG_PRINT("[crossfader] start recording at %lld for %lld frames (%g secs)\n", stream_position, stream_length - stream_position, (stream_length - stream_position) / (double)fmt.rate);
position = stream_position;
length = stream_length;
af = fmt;
nframes = 0;
rframes = 0;
}
void CrossFader::flush(){
GM_DEBUG_PRINT("[crossfader] flush\n");
buffer.clear();
length = 0;
position = -1;
nframes = 0;
rframes = 0;
recording = true;
}
FXlong CrossFader::start_offset() const {
return nframes;
}
FXint CrossFader::readable_frames() const {
return rframes;
}
FXint CrossFader::total_frames() const {
return nframes;
}
FXlong CrossFader::min_stream_length() const {
return (duration << 2) * af.rate;
}
void CrossFader::writeFrames(const FXuchar * data, FXint n) {
buffer.append(data, n * af.framesize());
nframes += n;
rframes += n;
}
void CrossFader::readFrames(FXint n) {
buffer.readBytes(n * af.framesize());
rframes -= n;
if (rframes == 0)
flush();
}
FXbool CrossFader::convert(const AudioFormat & target) {
GM_DEBUG_PRINT("[crossfade] converting samples\n");
#ifdef DEBUG
printf("[crossfade] source ");
af.debug();
printf("[crossfade] target ");
target.debug();
#endif
if (af.channels != target.channels) {
GM_DEBUG_PRINT("[crossfade] channel mismatch\n");
return false;
}
if (af.channelmap != target.channelmap) {
GM_DEBUG_PRINT("[crossfade] channelmap mismatch\n");
return false;
}
if (af.rate != target.rate) {
GM_DEBUG_PRINT("[crossfade] rate mismatch\n");
return false;
}
if (target.format == AP_FORMAT_S16) {
switch(af.format) {
case AP_FORMAT_FLOAT: float_to_s16(buffer.data(), buffer.size() / af.packing()); break;
case AP_FORMAT_S24_3: s24le3_to_s16(buffer.data(), buffer.size() / af.packing()); break;
default : GM_DEBUG_PRINT("[crossfade] conversion not implemented\n"); return false; break;
}
af.format = target.format;
return true;
}
else if (target.format == AP_FORMAT_FLOAT) {
switch(af.format) {
case AP_FORMAT_S16:
{
MemoryBuffer out;
s16_to_float(buffer.data(), buffer.size() / af.packing(), out);
buffer.adopt(out);
break;
}
case AP_FORMAT_S24_3:
{
MemoryBuffer out;
s24le3_to_float(buffer.data(), buffer.size() / af.packing(), out);
buffer.adopt(out);
break;
}
default : return false; break;
}
af.format = target.format;
return true;
}
else {
return false;
}
}
}
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