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SessionDescription.c
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#define LOG_CLASS "SessionDescription"
#include "../Include_i.h"
STATUS serializeSessionDescriptionInit(PRtcSessionDescriptionInit pSessionDescriptionInit, PCHAR sessionDescriptionJSON,
PUINT32 sessionDescriptionJSONLen)
{
ENTERS();
STATUS retStatus = STATUS_SUCCESS;
PCHAR curr, tail, next;
UINT32 lineLen, inputSize = 0, amountWritten;
CHK(pSessionDescriptionInit != NULL && sessionDescriptionJSONLen != NULL, STATUS_NULL_ARG);
inputSize = *sessionDescriptionJSONLen;
*sessionDescriptionJSONLen = 0;
amountWritten =
SNPRINTF(sessionDescriptionJSON, sessionDescriptionJSON == NULL ? 0 : inputSize - *sessionDescriptionJSONLen,
SESSION_DESCRIPTION_INIT_TEMPLATE_HEAD, pSessionDescriptionInit->type == SDP_TYPE_OFFER ? SDP_OFFER_VALUE : SDP_ANSWER_VALUE);
CHK(sessionDescriptionJSON == NULL || ((inputSize - *sessionDescriptionJSONLen) >= amountWritten), STATUS_BUFFER_TOO_SMALL);
*sessionDescriptionJSONLen += amountWritten;
curr = pSessionDescriptionInit->sdp;
tail = pSessionDescriptionInit->sdp + STRLEN(pSessionDescriptionInit->sdp);
while ((next = STRNCHR(curr, (UINT32) (tail - curr), '\n')) != NULL) {
lineLen = (UINT32) (next - curr);
if (lineLen > 0 && curr[lineLen - 1] == '\r') {
lineLen--;
}
amountWritten =
SNPRINTF(sessionDescriptionJSON + *sessionDescriptionJSONLen, sessionDescriptionJSON == NULL ? 0 : inputSize - *sessionDescriptionJSONLen,
"%*.*s%s", lineLen, lineLen, curr, SESSION_DESCRIPTION_INIT_LINE_ENDING);
CHK(sessionDescriptionJSON == NULL || ((inputSize - *sessionDescriptionJSONLen) >= amountWritten), STATUS_BUFFER_TOO_SMALL);
*sessionDescriptionJSONLen += amountWritten;
curr = next + 1;
}
amountWritten = SNPRINTF(sessionDescriptionJSON + *sessionDescriptionJSONLen,
sessionDescriptionJSON == NULL ? 0 : inputSize - *sessionDescriptionJSONLen, SESSION_DESCRIPTION_INIT_TEMPLATE_TAIL);
CHK(sessionDescriptionJSON == NULL || ((inputSize - *sessionDescriptionJSONLen) >= amountWritten), STATUS_BUFFER_TOO_SMALL);
*sessionDescriptionJSONLen += (amountWritten + 1); // NULL terminator
CleanUp:
LEAVES();
return retStatus;
}
STATUS deserializeSessionDescriptionInit(PCHAR sessionDescriptionJSON, UINT32 sessionDescriptionJSONLen,
PRtcSessionDescriptionInit pSessionDescriptionInit)
{
ENTERS();
STATUS retStatus = STATUS_SUCCESS;
jsmntok_t tokens[MAX_JSON_TOKEN_COUNT];
jsmn_parser parser;
INT32 i, j, tokenCount, lineLen;
PCHAR curr, next, tail;
CHK(pSessionDescriptionInit != NULL && sessionDescriptionJSON != NULL, STATUS_NULL_ARG);
MEMSET(pSessionDescriptionInit, 0x00, SIZEOF(RtcSessionDescriptionInit));
jsmn_init(&parser);
tokenCount = jsmn_parse(&parser, sessionDescriptionJSON, sessionDescriptionJSONLen, tokens, ARRAY_SIZE(tokens));
CHK(tokenCount > 1, STATUS_INVALID_API_CALL_RETURN_JSON);
CHK(tokens[0].type == JSMN_OBJECT, STATUS_SESSION_DESCRIPTION_INIT_NOT_OBJECT);
for (i = 1; i < tokenCount; i += 2) {
if (STRNCMP(SDP_TYPE_KEY, sessionDescriptionJSON + tokens[i].start, ARRAY_SIZE(SDP_TYPE_KEY) - 1) == 0) {
if (STRNCMP(SDP_OFFER_VALUE, sessionDescriptionJSON + tokens[i + 1].start, ARRAY_SIZE(SDP_OFFER_VALUE) - 1) == 0) {
pSessionDescriptionInit->type = SDP_TYPE_OFFER;
} else if (STRNCMP(SDP_ANSWER_VALUE, sessionDescriptionJSON + tokens[i + 1].start, ARRAY_SIZE(SDP_ANSWER_VALUE) - 1) == 0) {
pSessionDescriptionInit->type = SDP_TYPE_ANSWER;
} else {
CHK(FALSE, STATUS_SESSION_DESCRIPTION_INIT_INVALID_TYPE);
}
} else if (STRNCMP(SDP_KEY, sessionDescriptionJSON + tokens[i].start, ARRAY_SIZE(SDP_KEY) - 1) == 0) {
CHK((tokens[i + 1].end - tokens[i + 1].start) <= MAX_SESSION_DESCRIPTION_INIT_SDP_LEN,
STATUS_SESSION_DESCRIPTION_INIT_MAX_SDP_LEN_EXCEEDED);
curr = sessionDescriptionJSON + tokens[i + 1].start;
tail = sessionDescriptionJSON + tokens[i + 1].end;
j = 0;
// Unescape carriage return and line feed characters. The SDP that we receive at this point is in
// JSON format, meaning that carriage return and line feed characters are escaped. So, to represent
// these characters, a single escape character is prepended to each of them.
//
// When we store the sdp in memory, we want to recover the original format, without the escape characters.
//
// For example:
// \r becomes '\' and 'r'
// \n becomes '\' and 'n'
while ((next = STRNSTR(curr, SESSION_DESCRIPTION_INIT_LINE_ENDING_WITHOUT_CR, tail - curr)) != NULL) {
lineLen = (INT32) (next - curr);
// Check if the SDP format is using \r\n or \n separator.
// There are escape characters before \n and \r, so we need to move back 1 more character
if (lineLen > 1 && curr[lineLen - 2] == '\\' && curr[lineLen - 1] == 'r') {
lineLen -= 2;
}
MEMCPY((pSessionDescriptionInit->sdp) + j, curr, lineLen * SIZEOF(CHAR));
// Since we're adding 2 characters to the line, \r and \n (SDP record is separated by crlf),
// we need to add 2 to the serialized line so that the next iteration will not overwrite
// these 2 characters.
j += (lineLen + 2);
pSessionDescriptionInit->sdp[j - 2] = '\r';
pSessionDescriptionInit->sdp[j - 1] = '\n';
curr = next + 2;
}
}
}
CHK(pSessionDescriptionInit->sdp[0] != '\0', STATUS_SESSION_DESCRIPTION_INIT_MISSING_SDP);
CHK(pSessionDescriptionInit->type != 0, STATUS_SESSION_DESCRIPTION_INIT_MISSING_TYPE);
CleanUp:
LEAVES();
return retStatus;
}
/*
* Populate map with PayloadTypes if we are offering
*/
STATUS setPayloadTypesForOffer(PHashTable codecTable)
{
ENTERS();
STATUS retStatus = STATUS_SUCCESS;
CHK_STATUS(hashTableUpsert(codecTable, RTC_CODEC_MULAW, DEFAULT_PAYLOAD_MULAW));
CHK_STATUS(hashTableUpsert(codecTable, RTC_CODEC_ALAW, DEFAULT_PAYLOAD_ALAW));
CHK_STATUS(hashTableUpsert(codecTable, RTC_CODEC_VP8, DEFAULT_PAYLOAD_VP8));
CHK_STATUS(hashTableUpsert(codecTable, RTC_CODEC_OPUS, DEFAULT_PAYLOAD_OPUS));
CHK_STATUS(hashTableUpsert(codecTable, RTC_CODEC_AAC, DEFAULT_PAYLOAD_AAC));
CHK_STATUS(hashTableUpsert(codecTable, RTC_CODEC_H264_PROFILE_42E01F_LEVEL_ASYMMETRY_ALLOWED_PACKETIZATION_MODE, DEFAULT_PAYLOAD_H264));
CHK_STATUS(hashTableUpsert(codecTable, RTC_CODEC_H265, DEFAULT_PAYLOAD_H265));
CleanUp:
return retStatus;
}
/*
* Populate map with PayloadTypes for codecs a KvsPeerConnection has enabled.
*/
STATUS setPayloadTypesFromOffer(PHashTable codecTable, PHashTable rtxTable, PSessionDescription pSessionDescription)
{
ENTERS();
STATUS retStatus = STATUS_SUCCESS;
PSdpMediaDescription pMediaDescription = NULL;
UINT8 currentAttribute;
UINT16 currentMedia;
PCHAR attributeValue, end;
UINT64 parsedPayloadType, hashmapPayloadType, fmtpVal, aptVal;
UINT16 aptFmtpVals[MAX_SDP_FMTP_VALUES];
UINT16 aptFmtVal;
BOOL supportCodec;
UINT32 tokenLen, i, aptFmtpValCount;
PCHAR fmtp;
UINT64 fmtpScore, bestFmtpScore;
for (currentMedia = 0; currentMedia < pSessionDescription->mediaCount; currentMedia++) {
pMediaDescription = &(pSessionDescription->mediaDescriptions[currentMedia]);
aptFmtpValCount = 0;
bestFmtpScore = 0;
attributeValue = pMediaDescription->mediaName;
do {
if ((end = STRCHR(attributeValue, ' ')) != NULL) {
tokenLen = (end - attributeValue);
} else {
tokenLen = STRLEN(attributeValue);
}
if (STRNCMP(DEFAULT_PAYLOAD_MULAW_STR, attributeValue, tokenLen) == 0) {
CHK_STATUS(hashTableUpsert(codecTable, RTC_CODEC_MULAW, DEFAULT_PAYLOAD_MULAW));
} else if (STRNCMP(DEFAULT_PAYLOAD_ALAW_STR, attributeValue, tokenLen) == 0) {
CHK_STATUS(hashTableUpsert(codecTable, RTC_CODEC_ALAW, DEFAULT_PAYLOAD_ALAW));
}
if (end != NULL) {
attributeValue = end + 1;
}
} while (end != NULL);
for (currentAttribute = 0; currentAttribute < pMediaDescription->mediaAttributesCount; currentAttribute++) {
attributeValue = pMediaDescription->sdpAttributes[currentAttribute].attributeValue;
CHK_STATUS(hashTableContains(codecTable, RTC_CODEC_H265, &supportCodec));
if (supportCodec && (end = STRSTR(attributeValue, H265_VALUE)) != NULL) {
CHK_STATUS(STRTOUI64(attributeValue, end - 1, 10, &parsedPayloadType));
DLOGV("Found H265 payload type %" PRId64 ".", parsedPayloadType);
CHK_STATUS(hashTableUpsert(codecTable, RTC_CODEC_H265, parsedPayloadType));
}
CHK_STATUS(hashTableContains(codecTable, RTC_CODEC_H264_PROFILE_42E01F_LEVEL_ASYMMETRY_ALLOWED_PACKETIZATION_MODE, &supportCodec));
if (supportCodec && (end = STRSTR(attributeValue, H264_VALUE)) != NULL) {
CHK_STATUS(STRTOUI64(attributeValue, end - 1, 10, &parsedPayloadType));
fmtp = fmtpForPayloadType(parsedPayloadType, pSessionDescription);
fmtpScore = getH264FmtpScore(fmtp);
// When there's no match, the last fmtp will be chosen. This will allow us to not break existing customers who might be using
// flexible decoders which can infer the video profile from the SPS header.
if (fmtpScore >= bestFmtpScore) {
DLOGV("Found H264 payload type %" PRId64 " with score %lu: %s", parsedPayloadType, fmtpScore, fmtp);
CHK_STATUS(
hashTableUpsert(codecTable, RTC_CODEC_H264_PROFILE_42E01F_LEVEL_ASYMMETRY_ALLOWED_PACKETIZATION_MODE, parsedPayloadType));
bestFmtpScore = fmtpScore;
}
}
CHK_STATUS(hashTableContains(codecTable, RTC_CODEC_OPUS, &supportCodec));
if (supportCodec && (end = STRSTR(attributeValue, OPUS_VALUE)) != NULL) {
CHK_STATUS(STRTOUI64(attributeValue, end - 1, 10, &parsedPayloadType));
CHK_STATUS(hashTableUpsert(codecTable, RTC_CODEC_OPUS, parsedPayloadType));
}
CHK_STATUS(hashTableContains(codecTable, RTC_CODEC_AAC, &supportCodec));
if (supportCodec && (end = STRSTR(attributeValue, AAC_VALUE)) != NULL) {
CHK_STATUS(STRTOUI64(attributeValue, end - 1, 10, &parsedPayloadType));
CHK_STATUS(hashTableUpsert(codecTable, RTC_CODEC_AAC, parsedPayloadType));
}
CHK_STATUS(hashTableContains(codecTable, RTC_CODEC_VP8, &supportCodec));
if (supportCodec && (end = STRSTR(attributeValue, VP8_VALUE)) != NULL) {
CHK_STATUS(STRTOUI64(attributeValue, end - 1, 10, &parsedPayloadType));
CHK_STATUS(hashTableUpsert(codecTable, RTC_CODEC_VP8, parsedPayloadType));
}
CHK_STATUS(hashTableContains(codecTable, RTC_CODEC_MULAW, &supportCodec));
if (supportCodec && (end = STRSTR(attributeValue, MULAW_VALUE)) != NULL) {
CHK_STATUS(STRTOUI64(attributeValue, end - 1, 10, &parsedPayloadType));
CHK_STATUS(hashTableUpsert(codecTable, RTC_CODEC_MULAW, parsedPayloadType));
}
CHK_STATUS(hashTableContains(codecTable, RTC_CODEC_ALAW, &supportCodec));
if (supportCodec && (end = STRSTR(attributeValue, ALAW_VALUE)) != NULL) {
CHK_STATUS(STRTOUI64(attributeValue, end - 1, 10, &parsedPayloadType));
CHK_STATUS(hashTableUpsert(codecTable, RTC_CODEC_ALAW, parsedPayloadType));
}
if ((end = STRSTR(attributeValue, RTX_CODEC_VALUE)) != NULL) {
CHK_STATUS(STRTOUI64(end + STRLEN(RTX_CODEC_VALUE), NULL, 10, &parsedPayloadType));
if ((end = STRSTR(attributeValue, FMTP_VALUE)) != NULL) {
CHK_STATUS(STRTOUI64(end + STRLEN(FMTP_VALUE), NULL, 10, &fmtpVal));
aptFmtpVals[aptFmtpValCount++] = (UINT32) ((fmtpVal << 8u) & parsedPayloadType);
}
}
}
for (i = 0; i < aptFmtpValCount; i++) {
aptFmtVal = aptFmtpVals[i];
fmtpVal = aptFmtVal >> 8u;
aptVal = aptFmtVal & 0xFFu;
CHK_STATUS(hashTableContains(codecTable, RTC_CODEC_H265, &supportCodec));
if (supportCodec) {
CHK_STATUS(hashTableGet(codecTable, RTC_CODEC_H265, &hashmapPayloadType));
if (aptVal == hashmapPayloadType) {
CHK_STATUS(hashTableUpsert(rtxTable, RTC_RTX_CODEC_H265, fmtpVal));
DLOGV("h265 found apt type %" PRId64 " for fmtp %" PRId64, aptVal, fmtpVal);
}
}
CHK_STATUS(hashTableContains(codecTable, RTC_CODEC_H264_PROFILE_42E01F_LEVEL_ASYMMETRY_ALLOWED_PACKETIZATION_MODE, &supportCodec));
if (supportCodec) {
CHK_STATUS(hashTableGet(codecTable, RTC_CODEC_H264_PROFILE_42E01F_LEVEL_ASYMMETRY_ALLOWED_PACKETIZATION_MODE, &hashmapPayloadType));
if (aptVal == hashmapPayloadType) {
CHK_STATUS(hashTableUpsert(rtxTable, RTC_RTX_CODEC_H264_PROFILE_42E01F_LEVEL_ASYMMETRY_ALLOWED_PACKETIZATION_MODE, fmtpVal));
DLOGV("found apt type %" PRId64 " for fmtp %" PRId64, aptVal, fmtpVal);
}
}
CHK_STATUS(hashTableContains(codecTable, RTC_CODEC_VP8, &supportCodec));
if (supportCodec) {
CHK_STATUS(hashTableGet(codecTable, RTC_CODEC_VP8, &hashmapPayloadType));
if (aptVal == hashmapPayloadType) {
CHK_STATUS(hashTableUpsert(rtxTable, RTC_RTX_CODEC_VP8, fmtpVal));
}
}
}
}
CleanUp:
LEAVES();
return retStatus;
}
STATUS setTransceiverPayloadTypes(PHashTable codecTable, PHashTable rtxTable, PDoubleList pTransceivers)
{
ENTERS();
STATUS retStatus = STATUS_SUCCESS;
PDoubleListNode pCurNode = NULL;
PKvsRtpTransceiver pKvsRtpTransceiver;
UINT64 data;
// Loop over Transceivers and set the payloadType (which what we got from the other side)
// If a codec we want to send wasn't supported by the other return an error
CHK_STATUS(doubleListGetHeadNode(pTransceivers, &pCurNode));
while (pCurNode != NULL) {
CHK_STATUS(doubleListGetNodeData(pCurNode, &data));
pCurNode = pCurNode->pNext;
pKvsRtpTransceiver = (PKvsRtpTransceiver) data;
if (pKvsRtpTransceiver != NULL &&
(pKvsRtpTransceiver->transceiver.direction == RTC_RTP_TRANSCEIVER_DIRECTION_SENDRECV ||
pKvsRtpTransceiver->transceiver.direction == RTC_RTP_TRANSCEIVER_DIRECTION_SENDONLY)) {
CHK_STATUS(hashTableGet(codecTable, pKvsRtpTransceiver->sender.track.codec, &data));
pKvsRtpTransceiver->sender.payloadType = (UINT8) data;
pKvsRtpTransceiver->sender.rtxPayloadType = (UINT8) data;
// NACKs may have distinct PayloadTypes, look in the rtxTable and check. Otherwise NACKs will just be re-sending the same seqnum
if (hashTableGet(rtxTable, pKvsRtpTransceiver->sender.track.codec, &data) == STATUS_SUCCESS) {
pKvsRtpTransceiver->sender.rtxPayloadType = (UINT8) data;
}
}
UINT64 rollingBufferCapacity =
(UINT64) (pKvsRtpTransceiver->rollingBufferDurationSec * pKvsRtpTransceiver->rollingBufferBitratebps / 8 / DEFAULT_MTU_SIZE_BYTES);
DLOGI("The rolling buffer is configured to store %d RTP packets", rollingBufferCapacity);
CHK_STATUS(createRtpRollingBuffer(rollingBufferCapacity, &pKvsRtpTransceiver->sender.packetBuffer));
CHK_STATUS(createRetransmitter(DEFAULT_SEQ_NUM_BUFFER_SIZE, DEFAULT_VALID_INDEX_BUFFER_SIZE, &pKvsRtpTransceiver->sender.retransmitter));
}
CleanUp:
LEAVES();
return retStatus;
}
PCHAR fmtpForPayloadType(UINT64 payloadType, PSessionDescription pSessionDescription)
{
UINT32 currentMedia, currentAttribute;
PSdpMediaDescription pMediaDescription = NULL;
CHAR payloadStr[MAX_SDP_ATTRIBUTE_VALUE_LENGTH];
INT32 amountWritten = 0;
MEMSET(payloadStr, 0x00, MAX_SDP_ATTRIBUTE_VALUE_LENGTH);
amountWritten = SNPRINTF(payloadStr, SIZEOF(payloadStr), "%" PRId64, payloadType);
if (amountWritten < 0) {
DLOGE("Internal error: Full payload type for fmtp could not be written");
} else {
for (currentMedia = 0; currentMedia < pSessionDescription->mediaCount; currentMedia++) {
pMediaDescription = &(pSessionDescription->mediaDescriptions[currentMedia]);
for (currentAttribute = 0; currentAttribute < pMediaDescription->mediaAttributesCount; currentAttribute++) {
if (STRCMP(pMediaDescription->sdpAttributes[currentAttribute].attributeName, "fmtp") == 0 &&
STRNCMP(pMediaDescription->sdpAttributes[currentAttribute].attributeValue, payloadStr, STRLEN(payloadStr)) == 0) {
return pMediaDescription->sdpAttributes[currentAttribute].attributeValue + STRLEN(payloadStr) + 1;
}
}
}
}
return NULL;
}
/*
* Extracts a (hex) value after the provided prefix string. Returns true if
* successful.
*/
BOOL readHexValue(PCHAR input, PCHAR prefix, PUINT32 value)
{
PCHAR substr = STRSTR(input, prefix);
if (substr != NULL && SSCANF(substr + STRLEN(prefix), "%x", value) == 1) {
return TRUE;
}
return FALSE;
}
/*
* Scores the provided fmtp string based on this library's ability to
* process various types of H264 streams. A score of 0 indicates an
* incompatible fmtp line. Beyond this, a higher score indicates more
* compatibility with the desired characteristics, packetization-mode=1,
* level-asymmetry-allowed=1, and inbound match with our preferred
* profile-level-id.
*
* At some future time, it may be worth expressing this as a true distance
* function as defined here, although dealing with infinite floating point
* values can get tricky:
* https://www.w3.org/TR/mediacapture-streams/#dfn-fitness-distance
*/
UINT64 getH264FmtpScore(PCHAR fmtp)
{
UINT32 profileId = 0, packetizationMode = 0, levelAsymmetry = 0;
UINT64 score = 0;
// No ftmp match found.
if (fmtp == NULL) {
return 0;
}
// Currently, the packetization mode must be 1, as the packetization logic
// is currently not configurable, and sends both NALU and FU-A packets.
// https://tools.ietf.org/html/rfc7742#section-6.2
if (readHexValue(fmtp, "packetization-mode=", &packetizationMode) && packetizationMode == 1) {
score++;
}
if (readHexValue(fmtp, "profile-level-id=", &profileId) &&
(profileId & H264_FMTP_SUBPROFILE_MASK) == (H264_PROFILE_42E01F & H264_FMTP_SUBPROFILE_MASK) &&
(profileId & H264_FMTP_PROFILE_LEVEL_MASK) <= (H264_PROFILE_42E01F & H264_FMTP_PROFILE_LEVEL_MASK)) {
score++;
}
if (readHexValue(fmtp, "level-asymmetry-allowed=", &levelAsymmetry) && levelAsymmetry == 1) {
score++;
}
return score;
}
// Populate a single media section from a PKvsRtpTransceiver
STATUS populateSingleMediaSection(PKvsPeerConnection pKvsPeerConnection, PKvsRtpTransceiver pKvsRtpTransceiver,
PSdpMediaDescription pSdpMediaDescription, PSessionDescription pRemoteSessionDescription,
PCHAR pCertificateFingerprint, UINT32 mediaSectionId, PCHAR pDtlsRole, PHashTable pUnknownCodecPayloadTypesTable,
PHashTable pUnknownCodecRtpmapTable, UINT32 unknownCodecHashTableKey)
{
ENTERS();
STATUS retStatus = STATUS_SUCCESS;
UINT64 payloadType, rtxPayloadType;
BOOL containRtx = FALSE;
BOOL directionFound = FALSE;
UINT32 i, remoteAttributeCount, attributeCount = 0;
PRtcMediaStreamTrack pRtcMediaStreamTrack = &(pKvsRtpTransceiver->sender.track);
PSdpMediaDescription pSdpMediaDescriptionRemote;
PCHAR currentFmtp = NULL, rtpMapValue = NULL;
CHAR remoteSdpAttributeValue[MAX_SDP_ATTRIBUTE_VALUE_LENGTH];
INT32 amountWritten = 0;
MEMSET(remoteSdpAttributeValue, 0, MAX_SDP_ATTRIBUTE_VALUE_LENGTH);
if (pRtcMediaStreamTrack->codec == RTC_CODEC_UNKNOWN && pUnknownCodecPayloadTypesTable != NULL) {
CHK_STATUS(hashTableGet(pUnknownCodecPayloadTypesTable, unknownCodecHashTableKey, &payloadType));
} else {
CHK_STATUS(hashTableGet(pKvsPeerConnection->pCodecTable, pRtcMediaStreamTrack->codec, &payloadType));
if (!pKvsPeerConnection->isOffer) {
currentFmtp = fmtpForPayloadType(payloadType, pRemoteSessionDescription);
}
}
if (pRtcMediaStreamTrack->kind == MEDIA_STREAM_TRACK_KIND_VIDEO) {
if (pRtcMediaStreamTrack->codec == RTC_CODEC_H264_PROFILE_42E01F_LEVEL_ASYMMETRY_ALLOWED_PACKETIZATION_MODE) {
retStatus = hashTableGet(pKvsPeerConnection->pRtxTable, RTC_RTX_CODEC_H264_PROFILE_42E01F_LEVEL_ASYMMETRY_ALLOWED_PACKETIZATION_MODE,
&rtxPayloadType);
} else if (pRtcMediaStreamTrack->codec == RTC_CODEC_VP8) {
retStatus = hashTableGet(pKvsPeerConnection->pRtxTable, RTC_RTX_CODEC_VP8, &rtxPayloadType);
} else if (pRtcMediaStreamTrack->codec == RTC_CODEC_H265) {
retStatus = hashTableGet(pKvsPeerConnection->pRtxTable, RTC_RTX_CODEC_H265, &rtxPayloadType);
payloadType = DEFAULT_PAYLOAD_H265;
} else {
retStatus = STATUS_HASH_KEY_NOT_PRESENT;
}
CHK(retStatus == STATUS_SUCCESS || retStatus == STATUS_HASH_KEY_NOT_PRESENT, retStatus);
containRtx = (retStatus == STATUS_SUCCESS);
retStatus = STATUS_SUCCESS;
if (containRtx) {
amountWritten = SNPRINTF(pSdpMediaDescription->mediaName, SIZEOF(pSdpMediaDescription->mediaName),
"video 9 UDP/TLS/RTP/SAVPF %" PRId64 " %" PRId64, payloadType, rtxPayloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full video (with rtx) media name attribute could not be written");
} else {
amountWritten =
SNPRINTF(pSdpMediaDescription->mediaName, SIZEOF(pSdpMediaDescription->mediaName), "video 9 UDP/TLS/RTP/SAVPF %" PRId64, payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full video media name attribute could not be written");
}
} else if (pRtcMediaStreamTrack->kind == MEDIA_STREAM_TRACK_KIND_AUDIO) {
amountWritten =
SNPRINTF(pSdpMediaDescription->mediaName, SIZEOF(pSdpMediaDescription->mediaName), "audio 9 UDP/TLS/RTP/SAVPF %" PRId64, payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full audio media name attribute could not be written");
}
CHK_STATUS(iceAgentPopulateSdpMediaDescriptionCandidates(pKvsPeerConnection->pIceAgent, pSdpMediaDescription, MAX_SDP_ATTRIBUTE_VALUE_LENGTH,
&attributeCount));
if (containRtx) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "msid");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%s %sRTX",
pRtcMediaStreamTrack->streamId, pRtcMediaStreamTrack->trackId);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full msid value (with rtx) could not be written");
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "ssrc-group");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "FID %u %u",
pKvsRtpTransceiver->sender.ssrc, pKvsRtpTransceiver->sender.rtxSsrc);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full ssrc-grp value (with rtx) could not be written");
attributeCount++;
} else {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "msid");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%s %s", pRtcMediaStreamTrack->streamId,
pRtcMediaStreamTrack->trackId);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full msid value could not be written");
attributeCount++;
}
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "ssrc");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%u cname:%s",
pKvsRtpTransceiver->sender.ssrc, pKvsPeerConnection->localCNAME);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full ssrc cname could not be written");
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "ssrc");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%u msid:%s %s",
pKvsRtpTransceiver->sender.ssrc, pRtcMediaStreamTrack->streamId, pRtcMediaStreamTrack->trackId);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full ssrc msid could not be written");
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "ssrc");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%u mslabel:%s",
pKvsRtpTransceiver->sender.ssrc, pRtcMediaStreamTrack->streamId);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full ssrc mslabel could not be written");
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "ssrc");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%u label:%s",
pKvsRtpTransceiver->sender.ssrc, pRtcMediaStreamTrack->trackId);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full ssrc label could not be written");
attributeCount++;
if (containRtx) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "ssrc");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%u cname:%s",
pKvsRtpTransceiver->sender.rtxSsrc, pKvsPeerConnection->localCNAME);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full ssrc cname (with rtx) could not be written");
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "ssrc");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%u msid:%s %sRTX",
pKvsRtpTransceiver->sender.rtxSsrc, pRtcMediaStreamTrack->streamId, pRtcMediaStreamTrack->trackId);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full ssrc msid (with rtx) could not be written");
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "ssrc");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%u mslabel:%sRTX",
pKvsRtpTransceiver->sender.rtxSsrc, pRtcMediaStreamTrack->streamId);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full ssrc mslabel (with rtx) could not be written");
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "ssrc");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%u label:%sRTX",
pKvsRtpTransceiver->sender.rtxSsrc, pRtcMediaStreamTrack->trackId);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full ssrc label (with rtx) could not be written");
attributeCount++;
}
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtcp");
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue, "9 IN IP4 0.0.0.0");
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "ice-ufrag");
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue, pKvsPeerConnection->localIceUfrag);
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "ice-pwd");
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue, pKvsPeerConnection->localIcePwd);
attributeCount++;
if (pKvsPeerConnection->canTrickleIce.value) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "ice-options");
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue, "trickle");
attributeCount++;
}
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "fingerprint");
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue, "sha-256 ");
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue + 8, pCertificateFingerprint);
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "setup");
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue, pDtlsRole);
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "mid");
if (!pKvsPeerConnection->isOffer) {
// check all session attribute lines to see if a line with mid is present. If it is present, copy its content and break
for (i = 0; i < pRemoteSessionDescription->mediaDescriptions[mediaSectionId].mediaAttributesCount; i++) {
if (STRCMP(pRemoteSessionDescription->mediaDescriptions[mediaSectionId].sdpAttributes[i].attributeName, MID_KEY) == 0) {
STRCPY(remoteSdpAttributeValue, pRemoteSessionDescription->mediaDescriptions[mediaSectionId].sdpAttributes[i].attributeValue);
break;
}
}
}
// check if we already have a value for the "mid" session attribute from remote description. If we have it, we use it.
// If we don't have it, we loop over, create and add them
if (STRLEN(remoteSdpAttributeValue) > 0) {
CHK(STRLEN(remoteSdpAttributeValue) < MAX_SDP_ATTRIBUTE_VALUE_LENGTH, STATUS_BUFFER_TOO_SMALL);
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%s", remoteSdpAttributeValue);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Mid exists, but remote SDP value could not be written");
} else {
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%d", mediaSectionId);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full media section Id could not be written");
}
attributeCount++;
if (pKvsPeerConnection->isOffer) {
switch (pKvsRtpTransceiver->transceiver.direction) {
case RTC_RTP_TRANSCEIVER_DIRECTION_SENDRECV:
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "sendrecv");
break;
case RTC_RTP_TRANSCEIVER_DIRECTION_SENDONLY:
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "sendonly");
break;
case RTC_RTP_TRANSCEIVER_DIRECTION_RECVONLY:
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "recvonly");
break;
default:
// https://www.w3.org/TR/webrtc/#dom-rtcrtptransceiverdirection
DLOGW("Incorrect/no transceiver direction set...this attribute will be set to inactive");
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "inactive");
}
} else {
pSdpMediaDescriptionRemote = &pRemoteSessionDescription->mediaDescriptions[mediaSectionId];
remoteAttributeCount = pSdpMediaDescriptionRemote->mediaAttributesCount;
// in case of a missing m-line, we respond with the same m-line but direction set to inactive
if (pKvsRtpTransceiver->transceiver.direction == RTC_RTP_TRANSCEIVER_DIRECTION_INACTIVE) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "inactive");
directionFound = TRUE;
}
for (i = 0; i < remoteAttributeCount && directionFound == FALSE; i++) {
if (STRCMP(pSdpMediaDescriptionRemote->sdpAttributes[i].attributeName, "sendrecv") == 0) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "sendrecv");
directionFound = TRUE;
} else if (STRCMP(pSdpMediaDescriptionRemote->sdpAttributes[i].attributeName, "recvonly") == 0) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "sendonly");
directionFound = TRUE;
} else if (STRCMP(pSdpMediaDescriptionRemote->sdpAttributes[i].attributeName, "sendonly") == 0) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "recvonly");
directionFound = TRUE;
}
}
}
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtcp-mux");
attributeCount++;
if (mediaSectionId != 0) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtcp-rsize");
attributeCount++;
}
if (pRtcMediaStreamTrack->codec == RTC_CODEC_H264_PROFILE_42E01F_LEVEL_ASYMMETRY_ALLOWED_PACKETIZATION_MODE) {
// TODO: Need additional condition for a signaling channel with an ENABLED media storage configuration
if (pKvsPeerConnection->isOffer) {
currentFmtp = DEFAULT_H264_FMTP;
}
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtpmap");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " H264/90000", payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full H264 payload type could not be written");
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtcp-fb");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " nack", payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full H264 rtcp-fb nack value could not be written");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " nack pli", payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full H264 rtcp-fb nack-pli value could not be written");
attributeCount++;
// TODO: If level asymmetry is allowed, consider sending back DEFAULT_H264_FMTP instead of the received fmtp value.
if (currentFmtp != NULL) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "fmtp");
amountWritten =
SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " %s", payloadType, currentFmtp);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full H264 fmtp value could not be written");
attributeCount++;
}
if (containRtx) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtpmap");
amountWritten =
SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " " RTX_VALUE, rtxPayloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full H264 rtpmap (with rtx) could not be written");
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "fmtp");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " apt=%" PRId64 "",
rtxPayloadType, payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full H264 fmtp apt value (with rtx) could not be written");
attributeCount++;
}
} else if (pRtcMediaStreamTrack->codec == RTC_CODEC_OPUS) {
if (pKvsPeerConnection->isOffer) {
currentFmtp = DEFAULT_OPUS_FMTP;
}
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtpmap");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " opus/48000/2", payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full Opus rtpmap could not be written");
attributeCount++;
if (currentFmtp != NULL) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "fmtp");
amountWritten =
SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " %s", payloadType, currentFmtp);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full Opus fmtp could not be written");
attributeCount++;
}
} else if (pRtcMediaStreamTrack->codec == RTC_CODEC_AAC) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtpmap");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " AAC/16000", payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full Aac rtpmap could not be written");
attributeCount++;
} else if (pRtcMediaStreamTrack->codec == RTC_CODEC_VP8) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtpmap");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " " VP8_VALUE, payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full VP8 rtpmap could not be written");
attributeCount++;
if (containRtx) {
CHK_STATUS(hashTableGet(pKvsPeerConnection->pRtxTable, RTC_RTX_CODEC_VP8, &rtxPayloadType));
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtpmap");
amountWritten =
SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " " RTX_VALUE, rtxPayloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full VP8 rtpmap payload type (with rtx) could not be written");
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "fmtp");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " apt=%" PRId64 "",
rtxPayloadType, payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full VP8 rtpmap fmtp apt value (with rtx) could not be written");
attributeCount++;
}
} else if (pRtcMediaStreamTrack->codec == RTC_CODEC_MULAW) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtpmap");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " " MULAW_VALUE, payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full MULAW rtpmap could not be written");
attributeCount++;
} else if (pRtcMediaStreamTrack->codec == RTC_CODEC_ALAW) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtpmap");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " " ALAW_VALUE, payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full ALAW rtpmap could not be written");
attributeCount++;
} else if (pRtcMediaStreamTrack->codec == RTC_CODEC_H265) {
if (pKvsPeerConnection->isOffer) {
currentFmtp = DEFAULT_H265_FMTP;
}
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtpmap");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " H265/90000", payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full H265 rtpmap could not be written");
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtcp-fb");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " nack", payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full H265 rtcp-fb nack value could not be written");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " nack pli", payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full H265 rtcp-fb nack-pli value could not be written");
attributeCount++;
// TODO: If level asymmetry is allowed, consider sending back DEFAULT_H265_FMTP instead of the received fmtp value.
if (currentFmtp != NULL) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "fmtp");
amountWritten =
SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " %s", payloadType, currentFmtp);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full H265 fmtp value could not be written");
attributeCount++;
}
if (containRtx) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtpmap");
amountWritten =
SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " " RTX_VALUE, rtxPayloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full H265 rtpmap (with rtx) could not be written");
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "fmtp");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " apt=%" PRId64 "",
rtxPayloadType, payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full H265 fmtp apt value (with rtx) could not be written");
attributeCount++;
}
} else if (pRtcMediaStreamTrack->codec == RTC_CODEC_UNKNOWN) {
CHK_STATUS(hashTableGet(pUnknownCodecRtpmapTable, unknownCodecHashTableKey, (PUINT64) &rtpMapValue));
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtpmap");
amountWritten =
SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " %s", payloadType, rtpMapValue);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full Unknown rtpmap could not be written");
attributeCount++;
}
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "ssrc");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%u cname:%s",
pKvsRtpTransceiver->sender.ssrc, pKvsPeerConnection->localCNAME);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full transceiver ssrc cname could not be written");
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "ssrc");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%u msid:%s %s",
pKvsRtpTransceiver->sender.ssrc, pRtcMediaStreamTrack->streamId, pRtcMediaStreamTrack->trackId);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full transceiver ssrc msid could not be written");
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtcp-fb");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " goog-remb", payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full rtcp-fb goog-remb could not be written");
attributeCount++;
if (pKvsPeerConnection->twccExtId != 0) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtcp-fb");
amountWritten =
SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%" PRId64 " " TWCC_SDP_ATTR, payloadType);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full rtcp-fb twcc could not be written");
attributeCount++;
}
pSdpMediaDescription->mediaAttributesCount = attributeCount;
CleanUp:
LEAVES();
return retStatus;
}
STATUS populateSessionDescriptionDataChannel(PKvsPeerConnection pKvsPeerConnection, PSdpMediaDescription pSdpMediaDescription,
PCHAR pCertificateFingerprint, UINT32 mediaSectionId, PCHAR pDtlsRole)
{
ENTERS();
STATUS retStatus = STATUS_SUCCESS;
UINT32 attributeCount = 0;
INT32 amountWritten = 0;
amountWritten =
SNPRINTF(pSdpMediaDescription->mediaName, SIZEOF(pSdpMediaDescription->mediaName), "application 9 UDP/DTLS/SCTP webrtc-datachannel");
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full data channel media name could not be written");
CHK_STATUS(iceAgentPopulateSdpMediaDescriptionCandidates(pKvsPeerConnection->pIceAgent, pSdpMediaDescription, MAX_SDP_ATTRIBUTE_VALUE_LENGTH,
&attributeCount));
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "rtcp");
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue, "9 IN IP4 0.0.0.0");
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "ice-ufrag");
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue, pKvsPeerConnection->localIceUfrag);
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "ice-pwd");
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue, pKvsPeerConnection->localIcePwd);
attributeCount++;
if (pKvsPeerConnection->canTrickleIce.value) {
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "ice-options");
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue, "trickle");
attributeCount++;
}
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "fingerprint");
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue, "sha-256 ");
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue + 8, pCertificateFingerprint);
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "setup");
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue, pDtlsRole);
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "mid");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "%d", mediaSectionId);
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full data channel mid media section could not be written");
attributeCount++;
STRCPY(pSdpMediaDescription->sdpAttributes[attributeCount].attributeName, "sctp-port");
amountWritten = SNPRINTF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue,
SIZEOF(pSdpMediaDescription->sdpAttributes[attributeCount].attributeValue), "5000");
CHK_ERR(amountWritten > 0, STATUS_INTERNAL_ERROR, "Full data channel sctp-port could not be written");
attributeCount++;
pSdpMediaDescription->mediaAttributesCount = attributeCount;
CleanUp:
LEAVES();
return retStatus;
}
BOOL isPresentInRemote(PKvsRtpTransceiver pKvsRtpTransceiver, PSessionDescription pRemoteSessionDescription)
{
PCHAR remoteAttributeValue, end;
UINT32 remoteTokenLen, i;
PSdpMediaDescription pRemoteMediaDescription;
MEDIA_STREAM_TRACK_KIND localTrackKind = pKvsRtpTransceiver->sender.track.kind;
BOOL wasFound = FALSE;
for (i = 0; i < pRemoteSessionDescription->mediaCount && wasFound == FALSE; i++) {
pRemoteMediaDescription = &pRemoteSessionDescription->mediaDescriptions[i];
remoteAttributeValue = pRemoteMediaDescription->mediaName;
if ((end = STRCHR(remoteAttributeValue, ' ')) != NULL) {
remoteTokenLen = (end - remoteAttributeValue);
} else {
remoteTokenLen = STRLEN(remoteAttributeValue);
}
switch (localTrackKind) {
case MEDIA_STREAM_TRACK_KIND_AUDIO:
if (remoteTokenLen == (ARRAY_SIZE(MEDIA_SECTION_AUDIO_VALUE) - 1) &&
STRNCMP(MEDIA_SECTION_AUDIO_VALUE, remoteAttributeValue, remoteTokenLen) == 0) {
wasFound = TRUE;
}
break;
case MEDIA_STREAM_TRACK_KIND_VIDEO:
if (remoteTokenLen == (ARRAY_SIZE(MEDIA_SECTION_VIDEO_VALUE) - 1) &&
STRNCMP(MEDIA_SECTION_VIDEO_VALUE, remoteAttributeValue, remoteTokenLen) == 0) {
wasFound = TRUE;
}
break;
default:
DLOGW("Unknown track kind: %d", localTrackKind);
}
}
return wasFound;
}
// Populate the media sections of a SessionDescription with the current state of the KvsPeerConnection
STATUS populateSessionDescriptionMedia(PKvsPeerConnection pKvsPeerConnection, PSessionDescription pRemoteSessionDescription,
PSessionDescription pLocalSessionDescription)
{
ENTERS();
STATUS retStatus = STATUS_SUCCESS;
PDoubleListNode pCurNode = NULL;
CHAR certificateFingerprint[CERTIFICATE_FINGERPRINT_LENGTH];
UINT64 data;
PKvsRtpTransceiver pKvsRtpTransceiver;
PCHAR pDtlsRole = NULL;
PHashTable pUnknownCodecPayloadTypesTable = NULL, pUnknownCodecRtpmapTable = NULL;
UINT32 unknownCodecHashTableKey = 0;
UINT32 unknownHashTableBucketCount = 0;
CHK_STATUS(dtlsSessionGetLocalCertificateFingerprint(pKvsPeerConnection->pDtlsSession, certificateFingerprint, CERTIFICATE_FINGERPRINT_LENGTH));
if (pKvsPeerConnection->isOffer) {
pDtlsRole = DTLS_ROLE_ACTPASS;
CHK_STATUS(doubleListGetHeadNode(pKvsPeerConnection->pTransceivers, &pCurNode));
while (pCurNode != NULL) {
CHK_STATUS(doubleListGetNodeData(pCurNode, &data));
pCurNode = pCurNode->pNext;
pKvsRtpTransceiver = (PKvsRtpTransceiver) data;
if (pKvsRtpTransceiver != NULL) {
CHK(pLocalSessionDescription->mediaCount < MAX_SDP_SESSION_MEDIA_COUNT, STATUS_SESSION_DESCRIPTION_MAX_MEDIA_COUNT);
// If generating answer, need to check if Local Description is present in remote -- if not, we don't need to create a local
// description for it or else our Answer will have an extra m-line, for offer the local is the offer itself, don't care about remote
CHK_STATUS(populateSingleMediaSection(
pKvsPeerConnection, pKvsRtpTransceiver, &(pLocalSessionDescription->mediaDescriptions[pLocalSessionDescription->mediaCount]),
pRemoteSessionDescription, certificateFingerprint, pLocalSessionDescription->mediaCount, pDtlsRole, NULL, NULL, 0));
pLocalSessionDescription->mediaCount++;
}
}
} else {
pDtlsRole = DTLS_ROLE_ACTIVE;
unknownHashTableBucketCount =
pRemoteSessionDescription->mediaCount < MIN_HASH_BUCKET_COUNT ? MIN_HASH_BUCKET_COUNT : pRemoteSessionDescription->mediaCount;
CHK_STATUS(hashTableCreateWithParams(unknownHashTableBucketCount, CODEC_RTPMAP_PAYLOAD_TYPES_HASH_TABLE_BUCKET_LENGTH,
&pUnknownCodecPayloadTypesTable));
CHK_STATUS(
hashTableCreateWithParams(unknownHashTableBucketCount, CODEC_RTPMAP_PAYLOAD_TYPES_HASH_TABLE_BUCKET_LENGTH, &pUnknownCodecRtpmapTable));
// this function creates a list of transceivers corresponding to each m-line and adds it answerTransceivers