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/*
* Copyright (c) 2012 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 "webrtc/modules/rtp_rtcp/source/rtp_receiver_video.h"
#include <assert.h>
#include <string.h>
#include "webrtc/modules/rtp_rtcp/interface/rtp_payload_registry.h"
#include "webrtc/modules/rtp_rtcp/source/rtp_format_video_generic.h"
#include "webrtc/modules/rtp_rtcp/source/rtp_utility.h"
#include "webrtc/system_wrappers/interface/critical_section_wrapper.h"
#include "webrtc/system_wrappers/interface/logging.h"
#include "webrtc/system_wrappers/interface/trace_event.h"
namespace webrtc {
RTPReceiverStrategy* RTPReceiverStrategy::CreateVideoStrategy(
RtpData* data_callback) {
return new RTPReceiverVideo(data_callback);
}
RTPReceiverVideo::RTPReceiverVideo(RtpData* data_callback)
: RTPReceiverStrategy(data_callback) {}
RTPReceiverVideo::~RTPReceiverVideo() {
}
bool RTPReceiverVideo::ShouldReportCsrcChanges(
uint8_t payload_type) const {
// Always do this for video packets.
return true;
}
int32_t RTPReceiverVideo::OnNewPayloadTypeCreated(
const char payload_name[RTP_PAYLOAD_NAME_SIZE],
int8_t payload_type,
uint32_t frequency) {
return 0;
}
int32_t RTPReceiverVideo::ParseRtpPacket(
WebRtcRTPHeader* rtp_header,
const PayloadUnion& specific_payload,
bool is_red,
const uint8_t* payload,
uint16_t payload_length,
int64_t timestamp_ms,
bool is_first_packet) {
TRACE_EVENT2("webrtc_rtp", "Video::ParseRtp",
"seqnum", rtp_header->header.sequenceNumber,
"timestamp", rtp_header->header.timestamp);
rtp_header->type.Video.codec = specific_payload.Video.videoCodecType;
const uint16_t payload_data_length =
payload_length - rtp_header->header.paddingLength;
if (payload_data_length == 0)
return data_callback_->OnReceivedPayloadData(NULL, 0, rtp_header) == 0 ? 0
: -1;
return ParseVideoCodecSpecific(rtp_header,
payload,
payload_data_length,
specific_payload.Video.videoCodecType,
timestamp_ms,
is_first_packet);
}
int RTPReceiverVideo::GetPayloadTypeFrequency() const {
return kVideoPayloadTypeFrequency;
}
RTPAliveType RTPReceiverVideo::ProcessDeadOrAlive(
uint16_t last_payload_length) const {
return kRtpDead;
}
int32_t RTPReceiverVideo::InvokeOnInitializeDecoder(
RtpFeedback* callback,
int32_t id,
int8_t payload_type,
const char payload_name[RTP_PAYLOAD_NAME_SIZE],
const PayloadUnion& specific_payload) const {
// For video we just go with default values.
if (-1 == callback->OnInitializeDecoder(
id, payload_type, payload_name, kVideoPayloadTypeFrequency, 1, 0)) {
LOG(LS_ERROR) << "Failed to created decoder for payload type: "
<< payload_type;
return -1;
}
return 0;
}
// We are not allowed to hold a critical section when calling this function.
int32_t RTPReceiverVideo::ParseVideoCodecSpecific(
WebRtcRTPHeader* rtp_header,
const uint8_t* payload_data,
uint16_t payload_data_length,
RtpVideoCodecTypes video_type,
int64_t now_ms,
bool is_first_packet) {
switch (rtp_header->type.Video.codec) {
case kRtpVideoGeneric:
rtp_header->type.Video.isFirstPacket = is_first_packet;
return ReceiveGenericCodec(rtp_header, payload_data, payload_data_length);
case kRtpVideoVp8:
return ReceiveVp8Codec(rtp_header, payload_data, payload_data_length);
case kRtpVideoH264:
assert(false); // Not yet supported.
case kRtpVideoNone:
break;
}
return -1;
}
int32_t RTPReceiverVideo::BuildRTPheader(
const WebRtcRTPHeader* rtp_header,
uint8_t* data_buffer) const {
data_buffer[0] = static_cast<uint8_t>(0x80); // version 2
data_buffer[1] = static_cast<uint8_t>(rtp_header->header.payloadType);
if (rtp_header->header.markerBit) {
data_buffer[1] |= kRtpMarkerBitMask; // MarkerBit is 1
}
ModuleRTPUtility::AssignUWord16ToBuffer(data_buffer + 2,
rtp_header->header.sequenceNumber);
ModuleRTPUtility::AssignUWord32ToBuffer(data_buffer + 4,
rtp_header->header.timestamp);
ModuleRTPUtility::AssignUWord32ToBuffer(data_buffer + 8,
rtp_header->header.ssrc);
int32_t rtp_header_length = 12;
// Add the CSRCs if any
if (rtp_header->header.numCSRCs > 0) {
if (rtp_header->header.numCSRCs > 16) {
// error
assert(false);
}
uint8_t* ptr = &data_buffer[rtp_header_length];
for (uint32_t i = 0; i < rtp_header->header.numCSRCs; ++i) {
ModuleRTPUtility::AssignUWord32ToBuffer(ptr,
rtp_header->header.arrOfCSRCs[i]);
ptr += 4;
}
data_buffer[0] = (data_buffer[0] & 0xf0) | rtp_header->header.numCSRCs;
// Update length of header
rtp_header_length += sizeof(uint32_t) * rtp_header->header.numCSRCs;
}
return rtp_header_length;
}
int32_t RTPReceiverVideo::ReceiveVp8Codec(WebRtcRTPHeader* rtp_header,
const uint8_t* payload_data,
uint16_t payload_data_length) {
ModuleRTPUtility::RTPPayload parsed_packet;
ModuleRTPUtility::RTPPayloadParser rtp_payload_parser(
kRtpVideoVp8, payload_data, payload_data_length);
if (!rtp_payload_parser.Parse(parsed_packet))
return -1;
if (parsed_packet.info.VP8.dataLength == 0)
return 0;
rtp_header->frameType = (parsed_packet.frameType == ModuleRTPUtility::kIFrame)
? kVideoFrameKey : kVideoFrameDelta;
RTPVideoHeaderVP8* to_header = &rtp_header->type.Video.codecHeader.VP8;
ModuleRTPUtility::RTPPayloadVP8* from_header = &parsed_packet.info.VP8;
rtp_header->type.Video.isFirstPacket =
from_header->beginningOfPartition && (from_header->partitionID == 0);
to_header->nonReference = from_header->nonReferenceFrame;
to_header->pictureId =
from_header->hasPictureID ? from_header->pictureID : kNoPictureId;
to_header->tl0PicIdx =
from_header->hasTl0PicIdx ? from_header->tl0PicIdx : kNoTl0PicIdx;
if (from_header->hasTID) {
to_header->temporalIdx = from_header->tID;
to_header->layerSync = from_header->layerSync;
} else {
to_header->temporalIdx = kNoTemporalIdx;
to_header->layerSync = false;
}
to_header->keyIdx = from_header->hasKeyIdx ? from_header->keyIdx : kNoKeyIdx;
rtp_header->type.Video.width = from_header->frameWidth;
rtp_header->type.Video.height = from_header->frameHeight;
to_header->partitionId = from_header->partitionID;
to_header->beginningOfPartition = from_header->beginningOfPartition;
if (data_callback_->OnReceivedPayloadData(parsed_packet.info.VP8.data,
parsed_packet.info.VP8.dataLength,
rtp_header) != 0) {
return -1;
}
return 0;
}
int32_t RTPReceiverVideo::ReceiveGenericCodec(
WebRtcRTPHeader* rtp_header,
const uint8_t* payload_data,
uint16_t payload_data_length) {
uint8_t generic_header = *payload_data++;
--payload_data_length;
rtp_header->frameType =
((generic_header & RtpFormatVideoGeneric::kKeyFrameBit) != 0) ?
kVideoFrameKey : kVideoFrameDelta;
rtp_header->type.Video.isFirstPacket =
(generic_header & RtpFormatVideoGeneric::kFirstPacketBit) != 0;
if (data_callback_->OnReceivedPayloadData(
payload_data, payload_data_length, rtp_header) != 0) {
return -1;
}
return 0;
}
} // namespace webrtc
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