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/*
* Copyright (c) 2013 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 "modules/video_coding/deprecated/stream_generator.h"
#include <string.h>
#include <cstdint>
#include <list>
#include "api/video/video_frame_type.h"
#include "modules/video_coding/deprecated/packet.h"
#include "rtc_base/checks.h"
namespace webrtc {
StreamGenerator::StreamGenerator(uint16_t start_seq_num, int64_t current_time)
: packets_(), sequence_number_(start_seq_num), start_time_(current_time) {}
void StreamGenerator::Init(uint16_t start_seq_num, int64_t current_time) {
packets_.clear();
sequence_number_ = start_seq_num;
start_time_ = current_time;
memset(packet_buffer_, 0, sizeof(packet_buffer_));
}
void StreamGenerator::GenerateFrame(VideoFrameType type,
int num_media_packets,
int num_empty_packets,
int64_t time_ms) {
uint32_t timestamp = 90 * (time_ms - start_time_);
for (int i = 0; i < num_media_packets; ++i) {
const int packet_size =
(kFrameSize + num_media_packets / 2) / num_media_packets;
bool marker_bit = (i == num_media_packets - 1);
packets_.push_back(GeneratePacket(sequence_number_, timestamp, packet_size,
(i == 0), marker_bit, type));
++sequence_number_;
}
for (int i = 0; i < num_empty_packets; ++i) {
packets_.push_back(GeneratePacket(sequence_number_, timestamp, 0, false,
false, VideoFrameType::kEmptyFrame));
++sequence_number_;
}
}
VCMPacket StreamGenerator::GeneratePacket(uint16_t sequence_number,
uint32_t timestamp,
unsigned int size,
bool first_packet,
bool marker_bit,
VideoFrameType type) {
RTC_CHECK_LT(size, kMaxPacketSize);
VCMPacket packet;
packet.seqNum = sequence_number;
packet.timestamp = timestamp;
packet.video_header.frame_type = type;
packet.video_header.is_first_packet_in_frame = first_packet;
packet.markerBit = marker_bit;
packet.sizeBytes = size;
packet.dataPtr = packet_buffer_;
if (packet.is_first_packet_in_frame())
packet.completeNALU = kNaluStart;
else if (packet.markerBit)
packet.completeNALU = kNaluEnd;
else
packet.completeNALU = kNaluIncomplete;
return packet;
}
bool StreamGenerator::PopPacket(VCMPacket* packet, int index) {
std::list<VCMPacket>::iterator it = GetPacketIterator(index);
if (it == packets_.end())
return false;
if (packet)
*packet = (*it);
packets_.erase(it);
return true;
}
bool StreamGenerator::GetPacket(VCMPacket* packet, int index) {
std::list<VCMPacket>::iterator it = GetPacketIterator(index);
if (it == packets_.end())
return false;
if (packet)
*packet = (*it);
return true;
}
bool StreamGenerator::NextPacket(VCMPacket* packet) {
if (packets_.empty())
return false;
if (packet != nullptr)
*packet = packets_.front();
packets_.pop_front();
return true;
}
void StreamGenerator::DropLastPacket() {
packets_.pop_back();
}
uint16_t StreamGenerator::NextSequenceNumber() const {
if (packets_.empty())
return sequence_number_;
return packets_.front().seqNum;
}
int StreamGenerator::PacketsRemaining() const {
return packets_.size();
}
std::list<VCMPacket>::iterator StreamGenerator::GetPacketIterator(int index) {
std::list<VCMPacket>::iterator it = packets_.begin();
for (int i = 0; i < index; ++i) {
++it;
if (it == packets_.end())
break;
}
return it;
}
} // namespace webrtc
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