124 lines
3.1 KiB
C++
124 lines
3.1 KiB
C++
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/***************************************************************************************
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*
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* IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
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*
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* By downloading, copying, installing or using the software you agree to this license.
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* If you do not agree to this license, do not download, install,
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* copy or use the software.
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*
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* Copyright (C) 2014-2024, Happytimesoft Corporation, all rights reserved.
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*
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* Redistribution and use in binary forms, with or without modification, are permitted.
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*
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* Unless required by applicable law or agreed to in writing, software distributed
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* under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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* CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
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* language governing permissions and limitations under the License.
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*
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****************************************************************************************/
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#include "sys_inc.h"
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#include "rtp_rx.h"
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#include "rtp.h"
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BOOL rtp_data_rx(RTPRXI * p_rxi, uint8 * p_data, int len)
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{
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uint8 * p_rtp = p_data;
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uint32 rtp_len = len;
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// Check for the 12-byte RTP header:
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if (rtp_len < 12)
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{
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return FALSE;
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}
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uint32 rtpHdr = rtp_read_uint32(p_rtp); p_rtp += 4; rtp_len -= 4;
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uint8 rtpPT = ((rtpHdr & 0x007f0000) >> 16);
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BOOL rtpMarkerBit = (rtpHdr & 0x00800000) != 0;
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uint16 rtpSeq = rtpHdr & 0xFFFF;
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uint32 rtpTimestamp = rtp_read_uint32(p_rtp); p_rtp += 4; rtp_len -= 4;
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uint32 rtpSSRC = rtp_read_uint32(p_rtp); p_rtp += 4; rtp_len -= 4;
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// Check the RTP version number (it should be 2)
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if ((rtpHdr & 0xC0000000) != 0x80000000)
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{
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return FALSE;
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}
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// Skip over any CSRC identifiers in the header
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uint32 cc = (rtpHdr >> 24) & 0x0F;
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if (rtp_len < cc * 4)
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{
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return FALSE;
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}
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p_rtp += cc * 4; rtp_len -= cc * 4;
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// Check for (& ignore) any RTP header extension
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if (rtpHdr & 0x10000000)
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{
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if (rtp_len < 4)
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{
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return FALSE;
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}
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uint32 extHdr = rtp_read_uint32(p_rtp); p_rtp += 4; rtp_len -= 4;
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uint32 remExtSize = 4 * (extHdr & 0xFFFF);
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if (rtp_len < remExtSize)
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{
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return FALSE;
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}
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p_rtp += remExtSize; rtp_len -= remExtSize;
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}
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// Discard any padding bytes:
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if (rtpHdr & 0x20000000)
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{
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if (rtp_len == 0)
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{
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return FALSE;
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}
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uint32 numPaddingBytes = (uint32)p_rtp[rtp_len-1];
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if (rtp_len < numPaddingBytes)
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{
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return FALSE;
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}
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rtp_len -= numPaddingBytes;
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}
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if (0 == p_rxi->rtp_pt)
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{
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p_rxi->rtp_pt = rtpPT;
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}
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else if (rtpPT != p_rxi->rtp_pt)
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{
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return FALSE;
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}
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if (p_rxi->ssrc && p_rxi->ssrc != rtpSSRC)
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{
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log_print(HT_LOG_WARN, "%s, prev ssrc[%u], cur ssrc[%u]!!!\r\n", __FUNCTION__, p_rxi->ssrc, rtpSSRC);
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}
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p_rxi->ssrc = rtpSSRC;
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if (p_rxi->seq && p_rxi->seq != (uint16)(rtpSeq - 1))
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{
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p_rxi->rxf_loss = 1;
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log_print(HT_LOG_WARN, "%s, prev seq[%u], cur seq[%u]!!!\r\n", __FUNCTION__, p_rxi->seq, rtpSeq);
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}
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p_rxi->seq = rtpSeq;
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p_rxi->rxf_marker = rtpMarkerBit;
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p_rxi->ts = rtpTimestamp;
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p_rxi->p_data = p_rtp;
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p_rxi->len = rtp_len;
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return TRUE;
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}
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