/*
 *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include <algorithm>
#include <stdio.h>
#include <vector>

#include "NETEQTEST_RTPpacket.h"
#include "gtest/gtest.h"

/*********************/
/* Misc. definitions */
/*********************/

#define FIRSTLINELEN 40


int main(int argc, char* argv[])
{
    if(argc < 4 || argc > 6)
    {
        printf("Usage: RTPtimeshift in.rtp out.rtp newStartTS [newStartSN [newStartArrTime]]\n");
        exit(1);
    }

	FILE *inFile=fopen(argv[1],"rb");
	if (!inFile)
    {
        printf("Cannot open input file %s\n", argv[1]);
        return(-1);
    }
    printf("Input RTP file: %s\n",argv[1]);

	FILE *outFile=fopen(argv[2],"wb");
	if (!outFile)
    {
        printf("Cannot open output file %s\n", argv[2]);
        return(-1);
    }
	printf("Output RTP file: %s\n\n",argv[2]);

    // read file header and write directly to output file
	const unsigned int kRtpDumpHeaderSize = 4 + 4 + 4 + 2 + 2;
	char firstline[FIRSTLINELEN];
	EXPECT_TRUE(fgets(firstline, FIRSTLINELEN, inFile) != NULL);
	EXPECT_GT(fputs(firstline, outFile), 0);
	EXPECT_EQ(kRtpDumpHeaderSize,
	          fread(firstline, 1, kRtpDumpHeaderSize, inFile));
	EXPECT_EQ(kRtpDumpHeaderSize,
	          fwrite(firstline, 1, kRtpDumpHeaderSize, outFile));
	NETEQTEST_RTPpacket packet;
	int packLen = packet.readFromFile(inFile);
	if (packLen < 0)
	{
	    exit(1);
	}

    // get new start TS and start SeqNo from arguments
	uint32_t TSdiff = atoi(argv[3]) - packet.timeStamp();
	uint16_t SNdiff = 0;
	uint32_t ATdiff = 0;
    if (argc > 4)
    {
        int startSN = atoi(argv[4]);
        if (startSN >= 0)
            SNdiff = startSN - packet.sequenceNumber();
        if (argc > 5)
        {
            int startTS = atoi(argv[5]);
            if (startTS >= 0)
                ATdiff = startTS - packet.time();
        }
    }

    while (packLen >= 0)
    {

        packet.setTimeStamp(packet.timeStamp() + TSdiff);
        packet.setSequenceNumber(packet.sequenceNumber() + SNdiff);
        packet.setTime(packet.time() + ATdiff);

        packet.writeToFile(outFile);

        packLen = packet.readFromFile(inFile);

    }

    fclose(inFile);
    fclose(outFile);

    return 0;
}