#
/*
 *    Copyright (C) 2020 .. 2024
 *    Jan van Katwijk (J.vanKatwijk@gmail.com)
 *    Lazy Chair Computing
 *
 *    This file is part of the Qt-DAB program
 *
 *    Qt-DAB 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 2 of the License, or
 *    (at your option) any later version.
 *
 *    Qt-DAB 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 Qt-DAB; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *	Use the fdk-aac library.
 */
#include	"mp4processor.h"
#include	"radio.h"
//
#include	<cstring>
#include	"charsets.h"
#include	"fdk-aac.h"

//
/**
  *	For interpreting the HeAAC frames we have the faad decoder
  *	and the fdk-aac decoder`
  */
	fdkAAC::fdkAAC (RadioInterface *mr,
	                RingBuffer<complex16> *buffer) {
	this    -> audioBuffer  = buffer;
	working			= false;
	handle			= aacDecoder_Open (TT_MP4_LOAS, 1);
	if (handle == nullptr)
	   return;
	connect (this, &fdkAAC::newAudio, 
	         mr, &RadioInterface::newAudio);
	working			= true;
}

	fdkAAC::~fdkAAC () {
	if (working)
	   aacDecoder_Close (handle);
}

int16_t	fdkAAC::MP42PCM (stream_parms *sp,
	                 uint8_t   packet [],
	                 int16_t   packetLength) {
uint32_t	packet_size;
uint32_t	valid;
AAC_DECODER_ERROR err;
uint8_t		*ptr	= packet;
INT_PCM 	decode_buf [8 * sizeof (INT_PCM) * 2048];
INT_PCM		*bufp	= &decode_buf [0];
int		output_size	= 8 * 2048; 

	if (!working)
	   return -1;

	if ((packet [0] != 0x56)  || ((packet [1] >> 5) != 7)) 
	   return -1;


	packet_size  = (((packet [1] & 0x1F) << 8) | packet [2]) + 3;
	if (packet_size != (uint32_t)packetLength)
	   return -1;

	valid = packet_size;
	err = aacDecoder_Fill (handle, &ptr, &packet_size, &valid);
	if (err != AAC_DEC_OK) 
	   return -1;

	err = aacDecoder_DecodeFrame (handle,
	                              bufp,
		                      output_size, 0);
	if (err == AAC_DEC_NOT_ENOUGH_BITS)
	   return -1;

	if (err != AAC_DEC_OK) 
	   return -1;

	CStreamInfo *info = aacDecoder_GetStreamInfo (handle);
	if (!info || info -> sampleRate <= 0) 
	   return -1;

	if (info -> numChannels == 2) {
	   for (int i = 0; i < info -> frameSize; i ++) {
	      complex16 s = complex16 (bufp [2 * i], bufp [2 * i + 1]);
	      audioBuffer  -> putDataIntoBuffer (&s, 1);
	   }
	   if (audioBuffer -> GetRingBufferReadAvailable() >
	                          (int)info -> sampleRate / 8)
	      newAudio (info -> frameSize, info -> sampleRate,
	                sp -> psFlag, sp -> sbrFlag);
	}
	else
	if (info -> numChannels == 1) {
	   int16_t buffer [2 * info -> frameSize];
	   for (uint16_t i = 0; i < info -> frameSize; i ++) {
	      buffer [2 * i]	= ((int16_t *)bufp) [i];
	      buffer [2 * i + 1] = buffer [2 * i];
//	      buffer [2 * i + 1] = 0;
	   }

	   audioBuffer  -> putDataIntoBuffer ((complex16 *)buffer,
	                                      info -> frameSize);
//	   audioBuffer  -> putDataIntoBuffer (buffer, info -> frameSize * 2);
	   if (audioBuffer -> GetRingBufferReadAvailable() >
	                          (int)info -> sampleRate / 8)
	      newAudio (info -> frameSize, info -> sampleRate,
	                sp   ->  psFlag, sp   ->  sbrFlag);

	}
	else
	   fprintf (stderr, "Cannot handle these channels\n");

	return info -> numChannels; 
}