mirror of
https://github.com/axiomatic-systems/Bento4.git
synced 2026-01-19 00:05:12 +08:00
637 lines
21 KiB
C++
637 lines
21 KiB
C++
/*****************************************************************
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| AP4 - RTP Hint Objects
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| Copyright 2002-2008 Axiomatic Systems, LLC
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| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
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| Unless you have obtained Bento4 under a difference license,
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| this version of Bento4 is Bento4|GPL.
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| Bento4|GPL is free software; you can redistribute it and/or modify
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| it under the terms of the GNU General Public License as published by
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| the Free Software Foundation; either version 2, or (at your option)
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| any later version.
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| Bento4|GPL is distributed in the hope that it will be useful,
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| but WITHOUT ANY WARRANTY; without even the implied warranty of
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| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| GNU General Public License for more details.
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| You should have received a copy of the GNU General Public License
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| along with Bento4|GPL; see the file COPYING. If not, write to the
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| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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| 02111-1307, USA.
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****************************************************************/
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/*----------------------------------------------------------------------
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| includes
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+---------------------------------------------------------------------*/
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#include "Ap4RtpHint.h"
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#include "Ap4ByteStream.h"
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#include "Ap4Atom.h"
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/*----------------------------------------------------------------------
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| AP4_RtpSampleData::~AP4_RtpSampleData
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+---------------------------------------------------------------------*/
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AP4_RtpSampleData::~AP4_RtpSampleData()
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{
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AP4_List<AP4_RtpPacket>::Item* it = m_Packets.FirstItem();
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while (it != NULL) {
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it->GetData()->Release();
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it = it->GetNext();
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}
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}
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/*----------------------------------------------------------------------
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| AP4_RtpSampleData::AP4_RtpSampleData
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+---------------------------------------------------------------------*/
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AP4_RtpSampleData::AP4_RtpSampleData(AP4_ByteStream& stream, AP4_UI32 size)
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{
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// save the start position
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AP4_Position start, extra_data_start;
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stream.Tell(start);
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AP4_UI16 packet_count;
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stream.ReadUI16(packet_count);
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AP4_UI16 reserved;
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stream.ReadUI16(reserved); // later, check that reserved is 0
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// packets
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for (AP4_UI16 i=0; i<packet_count; i++) {
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AP4_RtpPacket* packet = new AP4_RtpPacket(stream);
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m_Packets.Add(packet);
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}
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// extra data
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stream.Tell(extra_data_start);
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AP4_Size extra_data_size = size - (AP4_UI32)(extra_data_start-start);
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if (extra_data_size != 0) {
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m_ExtraData.SetDataSize(extra_data_size);
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stream.Read(m_ExtraData.UseData(), extra_data_size);
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}
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}
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/*----------------------------------------------------------------------
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| AP4_RtpSampleData::GetSize
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+---------------------------------------------------------------------*/
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AP4_Size
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AP4_RtpSampleData::GetSize()
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{
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// packet count and reserved
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AP4_Size result = 4;
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// packets
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AP4_List<AP4_RtpPacket>::Item* it = m_Packets.FirstItem();
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while (it != NULL) {
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result = it->GetData()->GetSize();
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it = it->GetNext();
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}
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// extra data
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result += m_ExtraData.GetDataSize();
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return result;
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}
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/*----------------------------------------------------------------------
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| AP4_RtpSampleData::ToByteStream
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+---------------------------------------------------------------------*/
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AP4_ByteStream*
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AP4_RtpSampleData::ToByteStream()
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{
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// refresh the size
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AP4_Size size = GetSize();
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// create a memory stream
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AP4_MemoryByteStream* stream = new AP4_MemoryByteStream(size);
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// write in it
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AP4_Result result = stream->WriteUI16(static_cast<AP4_UI16>(m_Packets.ItemCount()));
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if (AP4_FAILED(result)) goto bail;
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result = stream->WriteUI16(0); // reserved
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if (AP4_FAILED(result)) goto bail;
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{
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AP4_List<AP4_RtpPacket>::Item* it = m_Packets.FirstItem();
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while (it != NULL) {
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result = it->GetData()->Write(*stream);
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if (AP4_FAILED(result)) goto bail;
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it = it->GetNext();
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}
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}
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result = stream->Write(m_ExtraData.GetData(), m_ExtraData.GetDataSize());
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if (AP4_FAILED(result)) goto bail;
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// return
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return stream;
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bail:
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stream->Release();
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return NULL;
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}
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/*----------------------------------------------------------------------
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| AP4_RtpSampleData::AddPacket
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_RtpSampleData::AddPacket(AP4_RtpPacket* packet)
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{
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packet->AddReference();
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return m_Packets.Add(packet);
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}
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/*----------------------------------------------------------------------
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| AP4_RtpPacket::AP4_RtpPacket
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+---------------------------------------------------------------------*/
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AP4_RtpPacket::AP4_RtpPacket(int relative_time,
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bool p_bit,
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bool x_bit,
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bool m_bit,
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AP4_UI08 payload_type,
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AP4_UI16 sequence_seed,
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int time_stamp_offset /* = 0 */,
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bool bframe_flag /* = false */,
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bool repeat_flag /* = false */) :
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m_ReferenceCount(1),
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m_RelativeTime(relative_time),
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m_PBit(p_bit),
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m_XBit(x_bit),
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m_MBit(m_bit),
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m_PayloadType(payload_type),
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m_SequenceSeed(sequence_seed),
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m_TimeStampOffset(time_stamp_offset),
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m_BFrameFlag(bframe_flag),
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m_RepeatFlag(repeat_flag)
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{}
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/*----------------------------------------------------------------------
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| AP4_RtpPacket::AP4_RtpPacket
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+---------------------------------------------------------------------*/
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AP4_RtpPacket::AP4_RtpPacket(AP4_ByteStream& stream) :
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m_ReferenceCount(1),
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m_TimeStampOffset(0)
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{
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AP4_UI08 octet;
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// relative time
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AP4_UI32 relative_time;
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stream.ReadUI32(relative_time);
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m_RelativeTime = relative_time;
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// pbit and xbit
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stream.ReadUI08(octet);
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m_PBit = (octet & 0x20) != 0;
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m_XBit = (octet & 0x10) != 0;
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// mbit and payload type
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stream.ReadUI08(octet);
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m_MBit = (octet & 0x80) != 0;
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m_PayloadType = octet & 0x7F;
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// sequence seed
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stream.ReadUI16(m_SequenceSeed);
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// extra, bframe and repeat flags
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stream.ReadUI08(octet);
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stream.ReadUI08(octet); // repeat on purpose
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bool extra_flag = (octet & 0x04) != 0;
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// bframe and repeat flags
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m_BFrameFlag = (octet & 0x02) != 0;
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m_RepeatFlag = (octet & 0x01) != 0;
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// constructor count
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AP4_UI16 constructor_count;
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stream.ReadUI16(constructor_count);
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// parse the packet extra data
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if (extra_flag) {
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// read the length
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AP4_UI32 extra_length;
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stream.ReadUI32(extra_length);
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// check it
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if (extra_length < 4) return;
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// now read the entries
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extra_length -= 4;
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while (extra_length > 0) {
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AP4_UI32 entry_length;
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AP4_UI32 entry_tag;
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stream.ReadUI32(entry_length);
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stream.ReadUI32(entry_tag);
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// check the entry
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if (entry_length < 8) return;
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// parse the single entry that's currently defined in the spec
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if (entry_tag == AP4_ATOM_TYPE('r','t','p','o') && entry_length == 12) {
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AP4_UI32 time_stamp_offset;
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stream.ReadUI32(time_stamp_offset);
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m_TimeStampOffset = time_stamp_offset;
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} else {
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// ignore it
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AP4_Position cur_pos;
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stream.Tell(cur_pos);
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stream.Seek(cur_pos + entry_length - 8); // 8 = length + tag
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}
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extra_length -= entry_length;
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}
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}
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// constructors
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for (AP4_UI16 i=0; i<constructor_count; i++) {
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AP4_RtpConstructor* constructor = NULL;
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AP4_RtpConstructorFactory::CreateConstructorFromStream(stream, constructor);
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m_Constructors.Add(constructor);
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}
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}
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/*----------------------------------------------------------------------
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| AP4_RtpPacket::AP4_RtpPacket
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+---------------------------------------------------------------------*/
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AP4_RtpPacket::~AP4_RtpPacket()
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{
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AP4_List<AP4_RtpConstructor>::Item* it = m_Constructors.FirstItem();
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while (it != NULL) {
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it->GetData()->Release();
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it = it->GetNext();
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}
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}
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/*----------------------------------------------------------------------
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| AP4_RtpPacket::AddReference
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+---------------------------------------------------------------------*/
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void
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AP4_RtpPacket::AddReference()
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{
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m_ReferenceCount++;
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}
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/*----------------------------------------------------------------------
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| AP4_RtpPacket::Release
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+---------------------------------------------------------------------*/
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void
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AP4_RtpPacket::Release()
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{
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if (--m_ReferenceCount == 0) {
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delete this;
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}
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}
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/*----------------------------------------------------------------------
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| AP4_RtpPacket::GetSize
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+---------------------------------------------------------------------*/
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AP4_Size
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AP4_RtpPacket::GetSize()
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{
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AP4_Size result = 12 + ((m_TimeStampOffset != 0)?16:0);
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result += m_Constructors.ItemCount() * AP4_RTP_CONSTRUCTOR_SIZE;
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return result;
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}
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/*----------------------------------------------------------------------
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| AP4_RtpPacket::Write
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_RtpPacket::Write(AP4_ByteStream& stream)
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{
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// check the payload type
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if (m_PayloadType > 128) return AP4_FAILURE;
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// now write
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AP4_Result result = stream.WriteUI32(m_RelativeTime);
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if (AP4_FAILED(result)) return result;
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result = stream.WriteUI08(0x80 | m_PBit << 5 | m_XBit << 4);
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if (AP4_FAILED(result)) return result;
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result = stream.WriteUI08(m_MBit << 7 | m_PayloadType);
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if (AP4_FAILED(result)) return result;
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result = stream.WriteUI16(m_SequenceSeed);
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if (AP4_FAILED(result)) return result;
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result = stream.WriteUI08(0);
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if (AP4_FAILED(result)) return result;
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// deal with extra flag
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bool extra_flag = m_TimeStampOffset != 0;
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result = stream.WriteUI08(0x00 | extra_flag << 2
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| m_BFrameFlag << 1
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| m_RepeatFlag << 0);
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if (AP4_FAILED(result)) return result;
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// constructor count
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result = stream.WriteUI16(static_cast<AP4_UI16>(m_Constructors.ItemCount()));
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// write extra data
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if (extra_flag) {
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// extra_length
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result = stream.WriteUI32(16); // 4 (extra_length) + 12 (rtpo atom)
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if (AP4_FAILED(result)) return result;
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// rtpo atom
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result = stream.WriteUI32(12); // size
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if (AP4_FAILED(result)) return result;
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result = stream.WriteUI32(AP4_ATOM_TYPE('r','t','p','o'));
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if (AP4_FAILED(result)) return result;
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result = stream.WriteUI32(m_TimeStampOffset);
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if (AP4_FAILED(result)) return result;
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}
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// constructors
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AP4_List<AP4_RtpConstructor>::Item* it = m_Constructors.FirstItem();
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while (it != NULL) {
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result = it->GetData()->Write(stream);
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if (AP4_FAILED(result)) return result;
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it = it->GetNext();
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}
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return result;
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}
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/*----------------------------------------------------------------------
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| AP4_RtpPacket::AddConstructor
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_RtpPacket::AddConstructor(AP4_RtpConstructor* constructor)
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{
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constructor->AddReference();
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return m_Constructors.Add(constructor);
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}
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/*----------------------------------------------------------------------
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| AP4_RtpConstructor::GetConstructedDataSize
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+---------------------------------------------------------------------*/
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AP4_Size
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AP4_RtpPacket::GetConstructedDataSize()
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{
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// header + ssrc
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AP4_Size size = 12;
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// constructed data from constructors
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AP4_List<AP4_RtpConstructor>::Item* constructors_it
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= m_Constructors.FirstItem();
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while (constructors_it != NULL) {
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size += constructors_it->GetData()->GetConstructedDataSize();
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constructors_it = constructors_it->GetNext();
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}
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return size;
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}
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/*----------------------------------------------------------------------
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| AP4_RtpConstructor::AddReference
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+---------------------------------------------------------------------*/
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void
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AP4_RtpConstructor::AddReference()
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{
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m_ReferenceCount++;
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}
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/*----------------------------------------------------------------------
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| AP4_RtpConstructor::Release
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+---------------------------------------------------------------------*/
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void
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AP4_RtpConstructor::Release()
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{
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if (--m_ReferenceCount == 0) {
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delete this;
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}
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}
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/*----------------------------------------------------------------------
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| AP4_RtpConstructor::Write
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_RtpConstructor::Write(AP4_ByteStream& stream)
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{
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AP4_Result result = stream.WriteUI08(m_Type);
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if (AP4_FAILED(result)) return result;
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return DoWrite(stream);
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}
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/*----------------------------------------------------------------------
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| AP4_NoopRtpConstructor::AP4_NoopRtpConstructor
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+---------------------------------------------------------------------*/
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AP4_NoopRtpConstructor::AP4_NoopRtpConstructor(AP4_ByteStream& stream) :
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AP4_RtpConstructor(AP4_RTP_CONSTRUCTOR_TYPE_NOOP)
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{
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AP4_Position cur_offset;
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stream.Tell(cur_offset);
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stream.Seek(cur_offset+15);
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}
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/*----------------------------------------------------------------------
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| AP4_NoopRtpConstructor::DoWrite
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_NoopRtpConstructor::DoWrite(AP4_ByteStream& stream)
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{
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AP4_UI08 pad[15];
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return stream.Write(pad, sizeof(pad));
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}
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/*----------------------------------------------------------------------
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| AP4_ImmediateRtpConstructor::AP4_ImmediateRtpConstructor
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+---------------------------------------------------------------------*/
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AP4_ImmediateRtpConstructor::AP4_ImmediateRtpConstructor(const AP4_DataBuffer& data) :
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AP4_RtpConstructor(AP4_RTP_CONSTRUCTOR_TYPE_IMMEDIATE),
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m_Data(data)
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{}
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/*----------------------------------------------------------------------
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| AP4_ImmediateRtpConstructor::AP4_ImmediateRtpConstructor
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+---------------------------------------------------------------------*/
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AP4_ImmediateRtpConstructor::AP4_ImmediateRtpConstructor(AP4_ByteStream& stream) :
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AP4_RtpConstructor(AP4_RTP_CONSTRUCTOR_TYPE_IMMEDIATE)
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{
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AP4_Position cur_offset;
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stream.Tell(cur_offset);
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// data
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AP4_UI08 data_size;
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stream.ReadUI08(data_size);
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m_Data.SetDataSize(data_size);
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stream.Read(m_Data.UseData(), data_size);
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// reposition the stream
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stream.Seek(cur_offset+15);
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}
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/*----------------------------------------------------------------------
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| AP4_ImmediateRtpConstructor::DoWrite
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_ImmediateRtpConstructor::DoWrite(AP4_ByteStream& stream)
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{
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// first check that the data is not too large
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if (m_Data.GetDataSize() > 14) return AP4_FAILURE;
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// now write
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AP4_Result result = stream.WriteUI08(static_cast<AP4_UI08>(m_Data.GetDataSize()));
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if (AP4_FAILED(result)) return result;
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result = stream.Write(m_Data.GetData(), m_Data.GetDataSize());
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if (AP4_FAILED(result)) return result;
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// pad
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AP4_Byte pad[14];
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return stream.Write(pad, sizeof(pad)-m_Data.GetDataSize());
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}
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/*----------------------------------------------------------------------
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| AP4_SampleRtpConstructor::AP4_SampleRtpConstructor
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+---------------------------------------------------------------------*/
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AP4_SampleRtpConstructor::AP4_SampleRtpConstructor(AP4_UI08 track_ref_index,
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AP4_UI16 length,
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AP4_UI32 sample_num,
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AP4_UI32 sample_offset) :
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AP4_RtpConstructor(AP4_RTP_CONSTRUCTOR_TYPE_SAMPLE),
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m_TrackRefIndex(track_ref_index),
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m_Length(length),
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m_SampleNum(sample_num),
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m_SampleOffset(sample_offset)
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{}
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/*----------------------------------------------------------------------
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| AP4_SampleRtpConstructor::AP4_SampleRtpConstructor
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+---------------------------------------------------------------------*/
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AP4_SampleRtpConstructor::AP4_SampleRtpConstructor(AP4_ByteStream& stream) :
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AP4_RtpConstructor(AP4_RTP_CONSTRUCTOR_TYPE_SAMPLE)
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{
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// offset
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AP4_Position cur_offset;
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stream.Tell(cur_offset);
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// data
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stream.ReadUI08(m_TrackRefIndex);
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stream.ReadUI16(m_Length);
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stream.ReadUI32(m_SampleNum);
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stream.ReadUI32(m_SampleOffset);
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// reposition the stream
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stream.Seek(cur_offset+15);
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}
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/*----------------------------------------------------------------------
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| AP4_SampleRtpConstructor::DoWrite
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+---------------------------------------------------------------------*/
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AP4_Result
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AP4_SampleRtpConstructor::DoWrite(AP4_ByteStream& stream)
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{
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AP4_Result result = stream.WriteUI08(m_TrackRefIndex);
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if (AP4_FAILED(result)) return result;
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result = stream.WriteUI16(m_Length);
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if (AP4_FAILED(result)) return result;
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result = stream.WriteUI32(m_SampleNum);
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if (AP4_FAILED(result)) return result;
|
|
|
|
result = stream.WriteUI32(m_SampleOffset);
|
|
if (AP4_FAILED(result)) return result;
|
|
|
|
result = stream.WriteUI16(1); // bytes per block
|
|
if (AP4_FAILED(result)) return result;
|
|
|
|
return stream.WriteUI16(1); // samples per block
|
|
}
|
|
|
|
/*----------------------------------------------------------------------
|
|
| AP4_SampleDescRtpConstructor::AP4_SampleDescRtpConstructor
|
|
+---------------------------------------------------------------------*/
|
|
AP4_SampleDescRtpConstructor::AP4_SampleDescRtpConstructor(AP4_UI08 track_ref_index,
|
|
AP4_UI16 length,
|
|
AP4_UI32 sample_desc_index,
|
|
AP4_UI32 sample_desc_offset) :
|
|
AP4_RtpConstructor(AP4_RTP_CONSTRUCTOR_TYPE_SAMPLE_DESC),
|
|
m_TrackRefIndex(track_ref_index),
|
|
m_Length(length),
|
|
m_SampleDescIndex(sample_desc_index),
|
|
m_SampleDescOffset(sample_desc_offset)
|
|
{}
|
|
|
|
/*----------------------------------------------------------------------
|
|
| AP4_SampleDescRtpConstructor::AP4_SampleDescRtpConstructor
|
|
+---------------------------------------------------------------------*/
|
|
AP4_SampleDescRtpConstructor::AP4_SampleDescRtpConstructor(AP4_ByteStream& stream) :
|
|
AP4_RtpConstructor(AP4_RTP_CONSTRUCTOR_TYPE_SAMPLE_DESC)
|
|
{
|
|
// offset
|
|
AP4_Position cur_offset;
|
|
stream.Tell(cur_offset);
|
|
|
|
// data
|
|
stream.ReadUI08(m_TrackRefIndex);
|
|
stream.ReadUI16(m_Length);
|
|
stream.ReadUI32(m_SampleDescIndex);
|
|
stream.ReadUI32(m_SampleDescOffset);
|
|
|
|
// reposition the stream
|
|
stream.Seek(cur_offset+15);
|
|
}
|
|
|
|
/*----------------------------------------------------------------------
|
|
| AP4_SampleDescRtpConstructor::DoWrite
|
|
+---------------------------------------------------------------------*/
|
|
AP4_Result
|
|
AP4_SampleDescRtpConstructor::DoWrite(AP4_ByteStream& stream)
|
|
{
|
|
AP4_Result result = stream.WriteUI08(m_TrackRefIndex);
|
|
if (AP4_FAILED(result)) return result;
|
|
|
|
result = stream.WriteUI16(m_Length);
|
|
if (AP4_FAILED(result)) return result;
|
|
|
|
result = stream.WriteUI32(m_SampleDescIndex);
|
|
if (AP4_FAILED(result)) return result;
|
|
|
|
result = stream.WriteUI32(m_SampleDescOffset);
|
|
if (AP4_FAILED(result)) return result;
|
|
|
|
return stream.WriteUI32(0); // reserved
|
|
}
|
|
|
|
/*----------------------------------------------------------------------
|
|
| AP4_RtpConstructorFactory::CreateConstructorFromStream
|
|
+---------------------------------------------------------------------*/
|
|
AP4_Result
|
|
AP4_RtpConstructorFactory::CreateConstructorFromStream(AP4_ByteStream& stream,
|
|
AP4_RtpConstructor*& constructor)
|
|
{
|
|
// read the first byte (type)
|
|
AP4_RtpConstructor::Type type;
|
|
AP4_Result result = stream.ReadUI08(type);
|
|
if (AP4_FAILED(result)) return result;
|
|
|
|
// now create the right constructor
|
|
switch(type) {
|
|
case AP4_RTP_CONSTRUCTOR_TYPE_NOOP:
|
|
constructor = new AP4_NoopRtpConstructor(stream);
|
|
break;
|
|
case AP4_RTP_CONSTRUCTOR_TYPE_IMMEDIATE:
|
|
constructor = new AP4_ImmediateRtpConstructor(stream);
|
|
break;
|
|
case AP4_RTP_CONSTRUCTOR_TYPE_SAMPLE:
|
|
constructor = new AP4_SampleRtpConstructor(stream);
|
|
break;
|
|
case AP4_RTP_CONSTRUCTOR_TYPE_SAMPLE_DESC:
|
|
constructor = new AP4_SampleDescRtpConstructor(stream);
|
|
break;
|
|
default:
|
|
return AP4_ERROR_INVALID_RTP_CONSTRUCTOR_TYPE;
|
|
}
|
|
|
|
return AP4_SUCCESS;
|
|
}
|