MediaStreamContext.cpp

/*
 * If not stated otherwise in this file or this component's license file the
 * following copyright and licenses apply:
 *
 * Copyright 2021 RDK Management
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
*/

/**
 * @file MediaStreamContext.cpp
 * @brief Handles operations on Media streams
 */

#include "MediaStreamContext.h"
#include "AampMemoryUtils.h"
#include "isobmff/isobmffbuffer.h"
#include "AampCacheHandler.h"

/**
 *  @brief Receives cached fragment and injects to sink.
 */
void MediaStreamContext::InjectFragmentInternal(CachedFragment* cachedFragment, bool &fragmentDiscarded)
{
    //FN_TRACE_F_MPD( __FUNCTION__ );
    if(!(aamp->GetLLDashServiceData()->lowLatencyMode  && (cachedFragment->type == eMEDIATYPE_AUDIO ||
                                                           cachedFragment->type == eMEDIATYPE_VIDEO)))
    {
	    aamp->ProcessID3Metadata(cachedFragment->fragment.ptr, cachedFragment->fragment.len, (MediaType) type); 
	    AAMPLOG_TRACE("Type[%d] cachedFragment->position: %f cachedFragment->duration: %f cachedFragment->initFragment: %d", type, cachedFragment->position,cachedFragment->duration,cachedFragment->initFragment);
        aamp->SendStreamTransfer((MediaType)type, &cachedFragment->fragment,
        cachedFragment->position, cachedFragment->position, cachedFragment->duration, cachedFragment->initFragment);
    }
    else
    {
        AAMPLOG_TRACE("Full Fragment Send Ignored in LL Mode");
    }
    fragmentDiscarded = false;
} // InjectFragmentInternal


/**
 *  @brief Fetch and cache a fragment
 */
bool MediaStreamContext::CacheFragment(std::string fragmentUrl, unsigned int curlInstance, double position, double duration, const char *range, bool initSegment, bool discontinuity
    , bool playingAd, double pto, uint32_t scale, bool overWriteTrackId)
{
    // FN_TRACE_F_MPD( __FUNCTION__ );
    bool ret = false;
    AAMPLOG_TRACE("Type[%d] fragmentUrl %s fragmentTime %f discontinuity %d pto %f  scale %lu duration %f", type, fragmentUrl.c_str(), position, discontinuity, pto, scale, duration);

    fragmentDurationSeconds = duration;
    ProfilerBucketType bucketType = aamp->GetProfilerBucketForMedia(mediaType, initSegment);
    CachedFragment* cachedFragment = GetFetchBuffer(true);
    long bitrate = 0;
    double downloadTime = 0;
    MediaType actualType = (MediaType)(initSegment?(eMEDIATYPE_INIT_VIDEO+mediaType):mediaType); //Need to revisit the logic

    cachedFragment->type = actualType;
    cachedFragment->initFragment = initSegment;

    if(!initSegment && mDownloadedFragment.ptr)
    {
        ret = true;
        cachedFragment->fragment.ptr = mDownloadedFragment.ptr;
        cachedFragment->fragment.len = mDownloadedFragment.len;
        cachedFragment->fragment.avail = mDownloadedFragment.avail;
        memset(&mDownloadedFragment, 0, sizeof(GrowableBuffer));
    }
    else
    {
        std::string effectiveUrl;
        int iFogError = -1;
        int iCurrentRate = aamp->rate; //  Store it as back up, As sometimes by the time File is downloaded, rate might have changed due to user initiated Trick-Play
        bool bReadfromcache = false;
        if(initSegment)
        {
            ret = bReadfromcache = aamp->getAampCacheHandler()->RetrieveFromInitFragCache(fragmentUrl,&cachedFragment->fragment,effectiveUrl);
        }

        if(!bReadfromcache)
        {
            ret = aamp->LoadFragment(pCMCDMetrics,bucketType, fragmentUrl,effectiveUrl, &cachedFragment->fragment, curlInstance,
                    range, actualType, &httpErrorCode, &downloadTime, &bitrate, &iFogError, fragmentDurationSeconds );
			if ( initSegment && ret )
            			aamp->getAampCacheHandler()->InsertToInitFragCache ( fragmentUrl, &cachedFragment->fragment, effectiveUrl, actualType);
        }

        if (iCurrentRate != AAMP_NORMAL_PLAY_RATE)
        {
            if(actualType == eMEDIATYPE_VIDEO)
            {
                actualType = eMEDIATYPE_IFRAME;
            }
            else if(actualType == eMEDIATYPE_INIT_VIDEO)
            {
                actualType = eMEDIATYPE_INIT_IFRAME;
            }
            //CID:101284 - To resolve the deadcode
        }
		else
		{
			if(actualType == eMEDIATYPE_INIT_VIDEO || actualType == eMEDIATYPE_INIT_AUDIO)
			{
				//To read track_id from the init fragments to check if there any mismatch.
				//A mismatch in track_id is not handled in the gstreamer version 1.10.4
				//But is handled in the latest version (1.18.5),
				//so upon upgrade to it or introduced a patch in qtdemux,
				//this portion can be reverted
				IsoBmffBuffer buffer;
				buffer.setBuffer((uint8_t *)cachedFragment->fragment.ptr, cachedFragment->fragment.len);
				buffer.parseBuffer();
				uint32_t track_id = 0;
				buffer.getTrack_id(track_id);
				
				
				if(actualType == eMEDIATYPE_INIT_VIDEO)
				{
					AAMPLOG_INFO("Video track_id read from init fragment: %d ", track_id);
					bool trackIdUpdated = false;
					if(aamp->mCurrentVideoTrackId != -1 && track_id != aamp->mCurrentVideoTrackId)
					{
						if(overWriteTrackId)
						{
							//Overwrite the track id of the init fragment with the existing track id since overWriteTrackId is true only while pushing the encrypted init fragment while clear content is being played
							buffer.parseBuffer(false, aamp->mCurrentVideoTrackId);
							AAMPLOG_WARN("Video track_id of the current track is overwritten as init fragment is pushing only for DRM purpose, track id: %d ", track_id);
							trackIdUpdated = true;
						}
						else
						{
							aamp->mIsTrackIdMismatch = true;
							AAMPLOG_WARN("TrackId mismatch detected for video, current track_id: %d, next period track_id: %d", aamp->mCurrentVideoTrackId, track_id);
						}
					}
					if(!trackIdUpdated)
					{
						aamp->mCurrentVideoTrackId = track_id;
					}
					
				}
				else
				{
					bool trackIdUpdated = false;
					AAMPLOG_INFO("Audio track_id read from init fragment: %d ", track_id);
					if(aamp->mCurrentAudioTrackId != -1 && track_id != aamp->mCurrentAudioTrackId)
					{
						if(overWriteTrackId)
						{
							buffer.parseBuffer(false, aamp->mCurrentAudioTrackId);
							AAMPLOG_WARN("Audio track_id of the current track is overwritten as init fragment is pushing only for DRM purpose, track id: %d ", track_id);
							trackIdUpdated = true;
						}
						else
						{
							aamp->mIsTrackIdMismatch = true;
							AAMPLOG_WARN("TrackId mismatch detected for audio, current track_id: %d, next period track_id: %d", aamp->mCurrentAudioTrackId, track_id);
						}
					}
					if(!trackIdUpdated)
					{
						aamp->mCurrentAudioTrackId = track_id;
					}
				}
			}
		}

        if(!bReadfromcache)
        {
            //update videoend info
            aamp->UpdateVideoEndMetrics( actualType,
                                    bitrate? bitrate : fragmentDescriptor.Bandwidth,
                                    (iFogError > 0 ? iFogError : httpErrorCode),effectiveUrl,duration, downloadTime);
        }
    }

    context->mCheckForRampdown = false;
    if(bitrate > 0 && bitrate != fragmentDescriptor.Bandwidth)
    {
        AAMPLOG_INFO("Bitrate changed from %u to %ld",fragmentDescriptor.Bandwidth, bitrate);
        fragmentDescriptor.Bandwidth = bitrate;
        context->SetTsbBandwidth(bitrate);
        mDownloadedFragment.ptr = cachedFragment->fragment.ptr;
        mDownloadedFragment.avail = cachedFragment->fragment.avail;
        mDownloadedFragment.len = cachedFragment->fragment.len;
        memset(&cachedFragment->fragment, 0, sizeof(GrowableBuffer));
        ret = false;
    }
    else if (!ret)
    {
	AAMPLOG_INFO("fragment fetch failed - Free cachedFragment");
        aamp_Free(&cachedFragment->fragment);
        if( aamp->DownloadsAreEnabled())
        {
            AAMPLOG_WARN("%sfragment fetch failed -- fragmentUrl %s", (initSegment)?"Init ":" ", fragmentUrl.c_str());
            if (mSkipSegmentOnError)
            {
                // Skip segment on error, and increse fail count
                segDLFailCount += 1;
            }
            else
            {
                // Rampdown already attempted on same segment
                // Reset flag for next fetch
                mSkipSegmentOnError = true;
            }
	int FragmentDownloadFailThreshold;
	GETCONFIGVALUE(eAAMPConfig_FragmentDownloadFailThreshold,FragmentDownloadFailThreshold);
            if (FragmentDownloadFailThreshold <= segDLFailCount)
            {
                if(!playingAd)    //If playingAd, we are invalidating the current Ad in onAdEvent().
                {
                    if (!initSegment)
                    {
                        AAMPLOG_ERR("Not able to download fragments; reached failure threshold sending tune failed event");
                        aamp->SendDownloadErrorEvent(AAMP_TUNE_FRAGMENT_DOWNLOAD_FAILURE, httpErrorCode);
                    }
                    else
                    {
                        // When rampdown limit is not specified, init segment will be ramped down, this wil
                        AAMPLOG_ERR("Not able to download init fragments; reached failure threshold sending tune failed event");
                        aamp->SendDownloadErrorEvent(AAMP_TUNE_INIT_FRAGMENT_DOWNLOAD_FAILURE, httpErrorCode);
                    }
                }
            }
            // DELIA-32287 - Profile RampDown check and rampdown is needed only for Video . If audio fragment download fails
            // should continue with next fragment,no retry needed .
            else if ((eTRACK_VIDEO == type) && !(context->CheckForRampDownLimitReached()))
            {
                // Attempt rampdown
                if (context->CheckForRampDownProfile(httpErrorCode))
                {
                    context->mCheckForRampdown = true;
                    if (!initSegment)
                    {
                        // Rampdown attempt success, download same segment from lower profile.
                        mSkipSegmentOnError = false;
                    }
                    AAMPLOG_WARN( "StreamAbstractionAAMP_MPD::Error while fetching fragment:%s, failedCount:%d. decrementing profile",
                             fragmentUrl.c_str(), segDLFailCount);
                }
                else
                {
                    if(!playingAd && initSegment)
                    {
                        // Already at lowest profile, send error event for init fragment.
                        AAMPLOG_ERR("Not able to download init fragments; reached failure threshold sending tune failed event");
                        aamp->SendDownloadErrorEvent(AAMP_TUNE_INIT_FRAGMENT_DOWNLOAD_FAILURE, httpErrorCode);
                    }
                    else
                    {
                        AAMPLOG_WARN("StreamAbstractionAAMP_MPD::Already at the lowest profile, skipping segment");
                        context->mRampDownCount = 0;
                    }
                }
            }
            else if (AAMP_IS_LOG_WORTHY_ERROR(httpErrorCode))
            {
                AAMPLOG_WARN("StreamAbstractionAAMP_MPD::Error on fetching %s fragment. failedCount:%d",
                         name, segDLFailCount);
                // For init fragment, rampdown limit is reached. Send error event.
                if(!playingAd && initSegment)
                {
                    aamp->SendDownloadErrorEvent(AAMP_TUNE_INIT_FRAGMENT_DOWNLOAD_FAILURE, httpErrorCode);
                }
            }
        }
    }
    else
    {
        cachedFragment->position = position;
        cachedFragment->duration = duration;
        cachedFragment->discontinuity = discontinuity;
#ifdef AAMP_DEBUG_INJECT
        if (discontinuity)
        {
            AAMPLOG_WARN("Discontinuous fragment");
        }
        if ((1 << type) & AAMP_DEBUG_INJECT)
        {
            cachedFragment->uri.assign(fragmentUrl);
        }
#endif
        segDLFailCount = 0;
        if ((eTRACK_VIDEO == type) && (!initSegment))
        {
            // reset count on video fragment success
            context->mRampDownCount = 0;
        }
        UpdateTSAfterFetch();
        ret = true;
    }
    return ret;
}

/**
 *  @brief Cache Fragment Chunk
 */
bool MediaStreamContext::CacheFragmentChunk(MediaType actualType, char *ptr, size_t size, std::string remoteUrl,long long dnldStartTime)
{
    AAMPLOG_TRACE("[%s] Chunk Buffer Length %d Remote URL %s", name, size, remoteUrl.c_str());

    bool ret = true;
    if (WaitForCachedFragmentChunkInjected())
    {
        CachedFragmentChunk* cachedFragmentChunk = NULL;
        cachedFragmentChunk = GetFetchChunkBuffer(true);
        if(NULL == cachedFragmentChunk)
        {
                AAMPLOG_WARN("[%s] Something Went wrong - Can't get FetchChunkBuffer", name);
                return false;
        }
        cachedFragmentChunk->type = actualType;
        cachedFragmentChunk->downloadStartTime = dnldStartTime;
        aamp_AppendBytes(&cachedFragmentChunk->fragmentChunk, ptr, size);

        AAMPLOG_TRACE("[%s] cachedFragmentChunk %p ptr %p",name, cachedFragmentChunk, cachedFragmentChunk->fragmentChunk.ptr);

        UpdateTSAfterChunkFetch();
    }
    else
    {
        AAMPLOG_WARN("[%s] WaitForCachedFragmentChunkInjected aborted", name);
        ret = false;
    }
    return ret;
}


/**
 *  @brief Listener to ABR profile change
 */
void MediaStreamContext::ABRProfileChanged(void)
{
    struct ProfileInfo profileMap = context->GetAdaptationSetAndRepresetationIndicesForProfile(context->currentProfileIndex);
    // Get AdaptationSet Index and Representation Index from the corresponding profile
    int adaptIdxFromProfile = profileMap.adaptationSetIndex;
    int reprIdxFromProfile = profileMap.representationIndex;
    if (!((adaptationSetIdx == adaptIdxFromProfile) && (representationIndex == reprIdxFromProfile)))
    {
        const IAdaptationSet *pNewAdaptationSet = context->GetAdaptationSetAtIndex(adaptIdxFromProfile);
        IRepresentation *pNewRepresentation = pNewAdaptationSet->GetRepresentation().at(reprIdxFromProfile);
        if(representation != NULL)
        {
            AAMPLOG_WARN("StreamAbstractionAAMP_MPD: ABR %dx%d[%d] -> %dx%d[%d]",
                    representation->GetWidth(), representation->GetHeight(), representation->GetBandwidth(),
                    pNewRepresentation->GetWidth(), pNewRepresentation->GetHeight(), pNewRepresentation->GetBandwidth());
            adaptationSetIdx = adaptIdxFromProfile;
            adaptationSet = pNewAdaptationSet;
            adaptationSetId = adaptationSet->GetId();
            representationIndex = reprIdxFromProfile;
            representation = pNewRepresentation;
	
			dash::mpd::IMPD *mpd = context->GetMPD();
			IPeriod *period = context->GetPeriod();
			fragmentDescriptor.ClearMatchingBaseUrl();
			fragmentDescriptor.AppendMatchingBaseUrl( &mpd->GetBaseUrls() );
			fragmentDescriptor.AppendMatchingBaseUrl( &period->GetBaseURLs() );
			fragmentDescriptor.AppendMatchingBaseUrl( &adaptationSet->GetBaseURLs() );
			fragmentDescriptor.AppendMatchingBaseUrl( &representation->GetBaseURLs() );

			fragmentDescriptor.Bandwidth = representation->GetBandwidth();
            fragmentDescriptor.RepresentationID.assign(representation->GetId());
            profileChanged = true;
        }
        else
        {
            AAMPLOG_WARN("representation is null");  //CID:83962 - Null Returns
        }
    }
    else
    {
        AAMPLOG_TRACE("StreamAbstractionAAMP_MPD:: Not switching ABR %dx%d[%d] ",
                representation->GetWidth(), representation->GetHeight(), representation->GetBandwidth());
    }

}

/**
 * @brief Get duration of buffer
 */
double MediaStreamContext::GetBufferedDuration()
{
    double position = aamp->GetPositionMs() / 1000.00;
    if(downloadedDuration >= position)
    {
        // If player faces buffering, this will be 0
        return (downloadedDuration - position);
    }
    else
    {
        // This avoids negative buffer, expecting
        // downloadedDuration never exceeds position in normal case.
        // Other case happens when contents are yet to be injected.
        downloadedDuration = 0;
        return downloadedDuration;
    }
}

/**
 * @brief Notify discontinuity during trick-mode as PTS re-stamping is done in sink
 */
void MediaStreamContext::SignalTrickModeDiscontinuity()
{
     //       FN_TRACE_F_MPD( __FUNCTION__ );
    aamp->SignalTrickModeDiscontinuity();
}

/**
 * @brief Returns if the end of track reached.
 */
bool MediaStreamContext::IsAtEndOfTrack()
{
    //        FN_TRACE_F_MPD( __FUNCTION__ );
    return eosReached;
}