/*
 *  Copyright (c) 2011 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.
 */

/*
 * This file conatins unit tests for the RtpUtility.
 */

#include "testing/gtest/include/gtest/gtest.h"
#include "webrtc/modules/rtp_rtcp/source/rtp_format_vp8.h"
#include "webrtc/modules/rtp_rtcp/source/rtp_utility.h"
#include "webrtc/typedefs.h"

namespace webrtc {

using RtpUtility::RTPPayloadParser;
using RtpUtility::RTPPayload;
using RtpUtility::RTPPayloadVP8;

// Payload descriptor
//       0 1 2 3 4 5 6 7
//      +-+-+-+-+-+-+-+-+
//      |X|R|N|S|PartID | (REQUIRED)
//      +-+-+-+-+-+-+-+-+
// X:   |I|L|T|K|  RSV  | (OPTIONAL)
//      +-+-+-+-+-+-+-+-+
// I:   |   PictureID   | (OPTIONAL)
//      +-+-+-+-+-+-+-+-+
// L:   |   TL0PICIDX   | (OPTIONAL)
//      +-+-+-+-+-+-+-+-+
// T/K: |TID:Y| KEYIDX  | (OPTIONAL)
//      +-+-+-+-+-+-+-+-+
//
// Payload header
//       0 1 2 3 4 5 6 7
//      +-+-+-+-+-+-+-+-+
//      |Size0|H| VER |P|
//      +-+-+-+-+-+-+-+-+
//      |     Size1     |
//      +-+-+-+-+-+-+-+-+
//      |     Size2     |
//      +-+-+-+-+-+-+-+-+
//      | Bytes 4..N of |
//      | VP8 payload   |
//      :               :
//      +-+-+-+-+-+-+-+-+
//      | OPTIONAL RTP  |
//      | padding       |
//      :               :
//      +-+-+-+-+-+-+-+-+

void VerifyBasicHeader(const RTPPayloadVP8 &header,
                       bool N, bool S, int PartID) {
  EXPECT_EQ(N, header.nonReferenceFrame);
  EXPECT_EQ(S, header.beginningOfPartition);
  EXPECT_EQ(PartID, header.partitionID);
}

void VerifyExtensions(const RTPPayloadVP8 &header,
                      bool I, bool L, bool T, bool K) {
  EXPECT_EQ(I, header.hasPictureID);
  EXPECT_EQ(L, header.hasTl0PicIdx);
  EXPECT_EQ(T, header.hasTID);
  EXPECT_EQ(K, header.hasKeyIdx);
}

TEST(ParseVP8Test, BasicHeader) {
  uint8_t payload[4] = {0};
  payload[0] = 0x14;  // Binary 0001 0100; S = 1, PartID = 4.
  payload[1] = 0x01;  // P frame.

  RTPPayloadParser rtpPayloadParser(kRtpVideoVp8, payload, 4);

  RTPPayload parsedPacket;
  ASSERT_TRUE(rtpPayloadParser.Parse(parsedPacket));

  EXPECT_EQ(RtpUtility::kPFrame, parsedPacket.frameType);
  EXPECT_EQ(kRtpVideoVp8, parsedPacket.type);

  VerifyBasicHeader(parsedPacket.info.VP8, 0 /*N*/, 1 /*S*/, 4 /*PartID*/);
  VerifyExtensions(parsedPacket.info.VP8, 0 /*I*/, 0 /*L*/, 0 /*T*/, 0 /*K*/);

  EXPECT_EQ(payload + 1, parsedPacket.info.VP8.data);
  EXPECT_EQ(4 - 1, parsedPacket.info.VP8.dataLength);
}

TEST(ParseVP8Test, PictureID) {
  uint8_t payload[10] = {0};
  payload[0] = 0xA0;
  payload[1] = 0x80;
  payload[2] = 17;

  RTPPayloadParser rtpPayloadParser(kRtpVideoVp8, payload, 10);

  RTPPayload parsedPacket;
  ASSERT_TRUE(rtpPayloadParser.Parse(parsedPacket));

  EXPECT_EQ(RtpUtility::kPFrame, parsedPacket.frameType);
  EXPECT_EQ(kRtpVideoVp8, parsedPacket.type);

  VerifyBasicHeader(parsedPacket.info.VP8, 1 /*N*/, 0 /*S*/, 0 /*PartID*/);
  VerifyExtensions(parsedPacket.info.VP8, 1 /*I*/, 0 /*L*/, 0 /*T*/, 0 /*K*/);

  EXPECT_EQ(17, parsedPacket.info.VP8.pictureID);

  EXPECT_EQ(payload + 3, parsedPacket.info.VP8.data);
  EXPECT_EQ(10 - 3, parsedPacket.info.VP8.dataLength);


  // Re-use payload, but change to long PictureID.
  payload[2] = 0x80 | 17;
  payload[3] = 17;
  RTPPayloadParser rtpPayloadParser2(kRtpVideoVp8, payload, 10);

  ASSERT_TRUE(rtpPayloadParser2.Parse(parsedPacket));

  VerifyBasicHeader(parsedPacket.info.VP8, 1 /*N*/, 0 /*S*/, 0 /*PartID*/);
  VerifyExtensions(parsedPacket.info.VP8, 1 /*I*/, 0 /*L*/, 0 /*T*/, 0 /*K*/);

  EXPECT_EQ((17<<8) + 17, parsedPacket.info.VP8.pictureID);

  EXPECT_EQ(payload + 4, parsedPacket.info.VP8.data);
  EXPECT_EQ(10 - 4, parsedPacket.info.VP8.dataLength);
}

TEST(ParseVP8Test, Tl0PicIdx) {
  uint8_t payload[13] = {0};
  payload[0] = 0x90;
  payload[1] = 0x40;
  payload[2] = 17;

  RTPPayloadParser rtpPayloadParser(kRtpVideoVp8, payload, 13);

  RTPPayload parsedPacket;
  ASSERT_TRUE(rtpPayloadParser.Parse(parsedPacket));

  EXPECT_EQ(RtpUtility::kIFrame, parsedPacket.frameType);
  EXPECT_EQ(kRtpVideoVp8, parsedPacket.type);

  VerifyBasicHeader(parsedPacket.info.VP8, 0 /*N*/, 1 /*S*/, 0 /*PartID*/);
  VerifyExtensions(parsedPacket.info.VP8, 0 /*I*/, 1 /*L*/, 0 /*T*/, 0 /*K*/);

  EXPECT_EQ(17, parsedPacket.info.VP8.tl0PicIdx);

  EXPECT_EQ(payload + 3, parsedPacket.info.VP8.data);
  EXPECT_EQ(13 - 3, parsedPacket.info.VP8.dataLength);
}

TEST(ParseVP8Test, TIDAndLayerSync) {
  uint8_t payload[10] = {0};
  payload[0] = 0x88;
  payload[1] = 0x20;
  payload[2] = 0x80;  // TID(2) + LayerSync(false)

  RTPPayloadParser rtpPayloadParser(kRtpVideoVp8, payload, 10);

  RTPPayload parsedPacket;
  ASSERT_TRUE(rtpPayloadParser.Parse(parsedPacket));

  EXPECT_EQ(RtpUtility::kPFrame, parsedPacket.frameType);
  EXPECT_EQ(kRtpVideoVp8, parsedPacket.type);

  VerifyBasicHeader(parsedPacket.info.VP8, 0 /*N*/, 0 /*S*/, 8 /*PartID*/);
  VerifyExtensions(parsedPacket.info.VP8, 0 /*I*/, 0 /*L*/, 1 /*T*/, 0 /*K*/);

  EXPECT_EQ(2, parsedPacket.info.VP8.tID);
  EXPECT_FALSE(parsedPacket.info.VP8.layerSync);

  EXPECT_EQ(payload + 3, parsedPacket.info.VP8.data);
  EXPECT_EQ(10 - 3, parsedPacket.info.VP8.dataLength);
}

TEST(ParseVP8Test, KeyIdx) {
  uint8_t payload[10] = {0};
  payload[0] = 0x88;
  payload[1] = 0x10;  // K = 1.
  payload[2] = 0x11;  // KEYIDX = 17 decimal.

  RTPPayloadParser rtpPayloadParser(kRtpVideoVp8, payload, 10);

  RTPPayload parsedPacket;
  ASSERT_TRUE(rtpPayloadParser.Parse(parsedPacket));

  EXPECT_EQ(RtpUtility::kPFrame, parsedPacket.frameType);
  EXPECT_EQ(kRtpVideoVp8, parsedPacket.type);

  VerifyBasicHeader(parsedPacket.info.VP8, 0 /*N*/, 0 /*S*/, 8 /*PartID*/);
  VerifyExtensions(parsedPacket.info.VP8, 0 /*I*/, 0 /*L*/, 0 /*T*/, 1 /*K*/);

  EXPECT_EQ(17, parsedPacket.info.VP8.keyIdx);

  EXPECT_EQ(payload + 3, parsedPacket.info.VP8.data);
  EXPECT_EQ(10 - 3, parsedPacket.info.VP8.dataLength);
}

TEST(ParseVP8Test, MultipleExtensions) {
  uint8_t payload[10] = {0};
  payload[0] = 0x88;
  payload[1] = 0x80 | 0x40 | 0x20 | 0x10;
  payload[2] = 0x80 | 17;    // PictureID, high 7 bits.
  payload[3] = 17;           // PictureID, low 8 bits.
  payload[4] = 42;           // Tl0PicIdx.
  payload[5] = 0x40 | 0x20 | 0x11;  // TID(1) + LayerSync(true) + KEYIDX(17).

  RTPPayloadParser rtpPayloadParser(kRtpVideoVp8, payload, 10);

  RTPPayload parsedPacket;
  ASSERT_TRUE(rtpPayloadParser.Parse(parsedPacket));

  EXPECT_EQ(RtpUtility::kPFrame, parsedPacket.frameType);
  EXPECT_EQ(kRtpVideoVp8, parsedPacket.type);

  VerifyBasicHeader(parsedPacket.info.VP8, 0 /*N*/, 0 /*S*/, 8 /*PartID*/);
  VerifyExtensions(parsedPacket.info.VP8, 1 /*I*/, 1 /*L*/, 1 /*T*/, 1 /*K*/);

  EXPECT_EQ((17<<8) + 17, parsedPacket.info.VP8.pictureID);
  EXPECT_EQ(42, parsedPacket.info.VP8.tl0PicIdx);
  EXPECT_EQ(1, parsedPacket.info.VP8.tID);
  EXPECT_EQ(17, parsedPacket.info.VP8.keyIdx);

  EXPECT_EQ(payload + 6, parsedPacket.info.VP8.data);
  EXPECT_EQ(10 - 6, parsedPacket.info.VP8.dataLength);
}

TEST(ParseVP8Test, TooShortHeader) {
  uint8_t payload[4] = {0};
  payload[0] = 0x88;
  payload[1] = 0x80 | 0x40 | 0x20 | 0x10;  // All extensions are enabled...
  payload[2] = 0x80 | 17;  // ... but only 2 bytes PictureID is provided.
  payload[3] = 17;  // PictureID, low 8 bits.

  RTPPayloadParser rtpPayloadParser(kRtpVideoVp8, payload, 4);

  RTPPayload parsedPacket;
  EXPECT_FALSE(rtpPayloadParser.Parse(parsedPacket));
}

TEST(ParseVP8Test, TestWithPacketizer) {
  uint8_t payload[10] = {0};
  uint8_t packet[20] = {0};
  RTPVideoHeaderVP8 inputHeader;
  inputHeader.nonReference = true;
  inputHeader.pictureId = 300;
  inputHeader.temporalIdx = 1;
  inputHeader.layerSync = false;
  inputHeader.tl0PicIdx = kNoTl0PicIdx;  // Disable.
  inputHeader.keyIdx = 31;
  RtpPacketizerVp8 packetizer(inputHeader, 20);
  packetizer.SetPayloadData(payload, 10, NULL);
  bool last;
  size_t send_bytes;
  ASSERT_TRUE(packetizer.NextPacket(packet, &send_bytes, &last));
  ASSERT_TRUE(last);

  RTPPayloadParser rtpPayloadParser(kRtpVideoVp8, packet, send_bytes);

  RTPPayload parsedPacket;
  ASSERT_TRUE(rtpPayloadParser.Parse(parsedPacket));

  EXPECT_EQ(RtpUtility::kIFrame, parsedPacket.frameType);
  EXPECT_EQ(kRtpVideoVp8, parsedPacket.type);

  VerifyBasicHeader(parsedPacket.info.VP8,
                    inputHeader.nonReference /*N*/,
                    1 /*S*/,
                    0 /*PartID*/);
  VerifyExtensions(parsedPacket.info.VP8,
                   1 /*I*/,
                   0 /*L*/,
                   1 /*T*/,
                   1 /*K*/);

  EXPECT_EQ(inputHeader.pictureId, parsedPacket.info.VP8.pictureID);
  EXPECT_EQ(inputHeader.temporalIdx, parsedPacket.info.VP8.tID);
  EXPECT_EQ(inputHeader.layerSync, parsedPacket.info.VP8.layerSync);
  EXPECT_EQ(inputHeader.keyIdx, parsedPacket.info.VP8.keyIdx);

  EXPECT_EQ(packet + 5, parsedPacket.info.VP8.data);
  EXPECT_EQ(send_bytes - 5, parsedPacket.info.VP8.dataLength);
}

}  // namespace