/*
 * linuxdvb output/writer handling.
 *
 * konfetti 2010 based on linuxdvb.c code from libeplayer2
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

/* ***************************** */
/* Includes                      */
/* ***************************** */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <linux/dvb/video.h>
#include <linux/dvb/audio.h>
#include <memory.h>
#include <asm/types.h>
#include <pthread.h>
#include <errno.h>

#include "stm_ioctls.h"
#include "bcm_ioctls.h"

#include "debug.h"
#include "common.h"
#include "output.h"
#include "debug.h"
#include "misc.h"
#include "pes.h"
#include "writer.h"

/* ***************************** */
/* Makros/Constants              */
/* ***************************** */

#define PES_AUDIO_PRIVATE_HEADER_SIZE   16                                // consider maximum private header size.
#define PES_AUDIO_HEADER_SIZE           (32 + PES_AUDIO_PRIVATE_HEADER_SIZE)
#define PES_AUDIO_PACKET_SIZE           2028
#define SPDIF_AUDIO_PACKET_SIZE         (1024 * sizeof(unsigned int) * 2) // stereo 32bit samples.

/* ***************************** */
/* Types                         */
/* ***************************** */

/* ***************************** */
/* Variables                     */
/* ***************************** */

/* ***************************** */
/* Prototypes                    */
/* ***************************** */

/* ***************************** */
/* MISC Functions                */
/* ***************************** */

static int32_t reset()
{
	return 0;
}

static int writeData(WriterAVCallData_t *call)
{
	uint8_t PesHeader[PES_AUDIO_HEADER_SIZE];

	dts_printf(10, "\n");

	if (call == NULL)
	{
		dts_err("call data is NULL...\n");
		return 0;
	}

	dts_printf(10, "AudioPts %lld\n", call->Pts);

	if ((call->data == NULL) || (call->len <= 0))
	{
		dts_err("parsing NULL Data. ignoring...\n");
		return 0;
	}

	if (call->fd < 0)
	{
		dts_err("file pointer < 0. ignoring ...\n");
		return 0;
	}

	uint8_t *Data = call->data;
	int32_t Size = call->len;

#ifdef CHECK_FOR_DTS_HD
	int32_t pos = 0;
	while ((pos + 4) <= Size)
	{
		// check for DTS-HD
		if (!strcmp((char *)(Data + pos), "\x64\x58\x20\x25"))
		{
			Size = pos;
			break;
		}
		++pos;
	}
#endif

// #define DO_BYTESWAP
#ifdef DO_BYTESWAP
	/* 16-bit byte swap all data before injecting it */
	for (i = 0; i < Size; i += 2)
	{
		uint8_t Tmp = Data[i];
		Data[i] = Data[i + 1];
		Data[i + 1] = Tmp;
	}
#endif

	struct iovec iov[2];
	iov[0].iov_base = PesHeader;
	iov[0].iov_len = InsertPesHeader(PesHeader, Size, MPEG_AUDIO_PES_START_CODE, call->Pts, 0);
	iov[1].iov_base = Data;
	iov[1].iov_len = Size;

	int32_t len = call->WriteV(call->fd, iov, 2);
	dts_printf(10, "< len %d\n", len);
	return len;
}

/* ***************************** */
/* Writer  Definition            */
/* ***************************** */

static WriterCaps_t caps =
{
	"dts",
	eAudio,
	"A_DTS",
	AUDIO_ENCODING_DTS,
	AUDIOTYPE_DTS,
	-1
};

struct Writer_s WriterAudioDTS =
{
	&reset,
	&writeData,
	&caps
};