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Use RtcpPacket to send RPSI in RtcpSender

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BUG=webrtc:2450

Review URL: https://codereview.webrtc.org/1291013002

Cr-Commit-Position: refs/heads/master@{#9704}
This commit is contained in:
sprang
2015-08-13 04:37:42 -07:00
committed by Commit bot
parent e2a8be1244
commit cf7f54d6f4
1 changed files with 8 additions and 53 deletions
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61
webrtc/modules/rtp_rtcp/source/rtcp_sender.cc
View File

@ -624,61 +624,16 @@ RTCPSender::BuildResult RTCPSender::BuildRPSI(RtcpContext* ctx) {
if (ctx->feedback_state.send_payload_type == 0xFF)
return BuildResult::kError;
// sanity
if (ctx->position + 24 >= IP_PACKET_SIZE)
rtcp::Rpsi rpsi;
rpsi.From(ssrc_);
rpsi.To(remote_ssrc_);
rpsi.WithPayloadType(ctx->feedback_state.send_payload_type);
rpsi.WithPictureId(ctx->picture_id);
PacketBuiltCallback callback(ctx);
if (!callback.BuildPacket(rpsi))
return BuildResult::kTruncated;
// add Reference Picture Selection Indication
uint8_t FMT = 3;
*ctx->AllocateData(1) = 0x80 + FMT;
*ctx->AllocateData(1) = 206;
// calc length
uint32_t bitsRequired = 7;
uint8_t bytesRequired = 1;
while ((ctx->picture_id >> bitsRequired) > 0) {
bitsRequired += 7;
bytesRequired++;
}
uint8_t size = 3;
if (bytesRequired > 6) {
size = 5;
} else if (bytesRequired > 2) {
size = 4;
}
*ctx->AllocateData(1) = 0;
*ctx->AllocateData(1) = size;
// Add our own SSRC
ByteWriter<uint32_t>::WriteBigEndian(ctx->AllocateData(4), ssrc_);
// Add the remote SSRC
ByteWriter<uint32_t>::WriteBigEndian(ctx->AllocateData(4), remote_ssrc_);
// calc padding length
uint8_t paddingBytes = 4 - ((2 + bytesRequired) % 4);
if (paddingBytes == 4)
paddingBytes = 0;
// add padding length in bits
*ctx->AllocateData(1) = paddingBytes * 8; // padding can be 0, 8, 16 or 24
// add payload type
*ctx->AllocateData(1) = ctx->feedback_state.send_payload_type;
// add picture ID
for (int i = bytesRequired - 1; i > 0; --i) {
*ctx->AllocateData(1) =
0x80 | static_cast<uint8_t>(ctx->picture_id >> (i * 7));
}
// add last byte of picture ID
*ctx->AllocateData(1) = static_cast<uint8_t>(ctx->picture_id & 0x7f);
// add padding
for (int j = 0; j < paddingBytes; j++) {
*ctx->AllocateData(1) = 0;
}
return BuildResult::kSuccess;
}