/*
 * linuxdvb output/writer handling.
 *
 * Copyright (C) 2010  konfetti (based on code from libeplayer2)
 * Copyright (C) 2014  martii   (based on code from libeplayer3)
 *
 * 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
 *
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <memory.h>
#include <asm/types.h>
#include "misc.h"
#include "pes.h"

int InsertVideoPrivateDataHeader(uint8_t *data, int payload_size)
{
	BitPacker_t ld2 = { data, 0, 32 };
	int i;

	PutBits(&ld2, PES_PRIVATE_DATA_FLAG, 8);
	PutBits(&ld2, payload_size & 0xff, 8);
	PutBits(&ld2, (payload_size >> 8) & 0xff, 8);
	PutBits(&ld2, (payload_size >> 16) & 0xff, 8);

	for (i = 4; i < (PES_PRIVATE_DATA_LENGTH + 1); i++)
		PutBits(&ld2, 0, 8);

	FlushBits(&ld2);

	return PES_PRIVATE_DATA_LENGTH + 1;

}

int InsertPesHeader(uint8_t *data, int size, uint8_t stream_id, int64_t pts, int pic_start_code)
{
	BitPacker_t ld2 = { data, 0, 32 };

	/* if (size > MAX_PES_PACKET_SIZE)
	    size = 0;       // unbounded */

	PutBits(&ld2, 0x0, 8);
	PutBits(&ld2, 0x0, 8);
	PutBits(&ld2, 0x1, 8);  // Start Code
	PutBits(&ld2, stream_id, 8);    // Stream_id = Audio Stream
	//4
	PutBits(&ld2, size + 3 + (pts != INVALID_PTS_VALUE ? 5 : 0) + (pic_start_code ? (5) : 0), 16);  // PES_packet_length
	//6 = 4+2
	PutBits(&ld2, 0x2, 2);  // 10
	PutBits(&ld2, 0x0, 2);  // PES_Scrambling_control
	PutBits(&ld2, 0x0, 1);  // PES_Priority
	PutBits(&ld2, 0x0, 1);  // data_alignment_indicator
	PutBits(&ld2, 0x0, 1);  // Copyright
	PutBits(&ld2, 0x0, 1);  // Original or Copy
	//7 = 6+1

	if (pts != INVALID_PTS_VALUE)
		PutBits(&ld2, 0x2, 2);
	else
		PutBits(&ld2, 0x0, 2);  // PTS_DTS flag

	PutBits(&ld2, 0x0, 1);  // ESCR_flag
	PutBits(&ld2, 0x0, 1);  // ES_rate_flag
	PutBits(&ld2, 0x0, 1);  // DSM_trick_mode_flag
	PutBits(&ld2, 0x0, 1);  // additional_copy_ingo_flag
	PutBits(&ld2, 0x0, 1);  // PES_CRC_flag
	PutBits(&ld2, 0x0, 1);  // PES_extension_flag
	//8 = 7+1

	if (pts != INVALID_PTS_VALUE)
		PutBits(&ld2, 0x5, 8);
	else
		PutBits(&ld2, 0x0, 8);  // PES_header_data_length
	//9 = 8+1

	if (pts != INVALID_PTS_VALUE)
	{
		PutBits(&ld2, 0x2, 4);
		PutBits(&ld2, (pts >> 30) & 0x7, 3);
		PutBits(&ld2, 0x1, 1);
		PutBits(&ld2, (pts >> 15) & 0x7fff, 15);
		PutBits(&ld2, 0x1, 1);
		PutBits(&ld2, pts & 0x7fff, 15);
		PutBits(&ld2, 0x1, 1);
	}
	//14 = 9+5

	if (pic_start_code)
	{
		PutBits(&ld2, 0x0, 8);
		PutBits(&ld2, 0x0, 8);
		PutBits(&ld2, 0x1, 8);  // Start Code
		PutBits(&ld2, pic_start_code & 0xff, 8);    // 00, for picture start
		PutBits(&ld2, (pic_start_code >> 8) & 0xff, 8); // For any extra information (like in mpeg4p2, the pic_start_code)
		//14 + 5 = 19
	}

	FlushBits(&ld2);

	return (ld2.Ptr - data);
}