Estou usando uma placa baseada na Texas Instruments OMAP-L138 que consiste basicamente em um SoC baseado em ARM9 e um processador DSP. Está conectado a uma lente de câmera. O que estou tentando fazer é capturar o fluxo de vídeo ao vivo, enviado ao processador dsp para a codificação H264, que é enviada pelo uPP em pacotes de 8192 bytes. Quero usar o testH264VideoStreamer fornecido pelo Live555 para transmitir ao vivo o vídeo codificado em H264 por RTSP. O código que eu modifiquei é mostrado abaixo:

#include <liveMedia.hh>
#include <BasicUsageEnvironment.hh>
#include <GroupsockHelper.hh>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <string.h>
#include <unistd.h> //to allow read() function




UsageEnvironment* env;
H264VideoStreamFramer* videoSource;
RTPSink* videoSink;


//-------------------------------------------------------------------------------
/* Open File Descriptor*/
int stream = open("/dev/upp", O_RDONLY);
/* Declaring a static 8 bit unsigned integer of size 8192 bytes that keeps its value between invocations */
static uint8_t buf[8192];
//------------------------------------------------------------------------------


//------------------------------------------------------------------------------
// Execute play function as a forwarding mechanism
//------------------------------------------------------------------------------
void play(); // forward


//------------------------------------------------------------------------------
// MAIN FUNCTION / ENTRY POINT 
//------------------------------------------------------------------------------
int main(int argc, char** argv) 
{
    // Begin by setting up our live555 usage environment:
    TaskScheduler* scheduler = BasicTaskScheduler::createNew();
    env = BasicUsageEnvironment::createNew(*scheduler);

    // Create 'groupsocks' for RTP and RTCP:
    struct in_addr destinationAddress;
    destinationAddress.s_addr = chooseRandomIPv4SSMAddress(*env);
    // Note: This is a multicast address.  If you wish instead to stream
    // using unicast, then you should use the "testOnDemandRTSPServer"
    // test program - not this test program - as a model.

    const unsigned short rtpPortNum = 18888;
    const unsigned short rtcpPortNum = rtpPortNum+1;
    const unsigned char ttl = 255;

    const Port rtpPort(rtpPortNum);
    const Port rtcpPort(rtcpPortNum);

    Groupsock rtpGroupsock(*env, destinationAddress, rtpPort, ttl);
    rtpGroupsock.multicastSendOnly(); // we're a SSM source
    Groupsock rtcpGroupsock(*env, destinationAddress, rtcpPort, ttl);
    rtcpGroupsock.multicastSendOnly(); // we're a SSM source

    // Create a 'H264 Video RTP' sink from the RTP 'groupsock':
    OutPacketBuffer::maxSize = 1000000;
    videoSink = H264VideoRTPSink::createNew(*env, &rtpGroupsock, 96);

    // Create (and start) a 'RTCP instance' for this RTP sink:
    const unsigned estimatedSessionBandwidth = 500; // in kbps; for RTCP b/w share
    const unsigned maxCNAMElen = 100;
    unsigned char CNAME[maxCNAMElen+1];
    gethostname((char*)CNAME, maxCNAMElen);
    CNAME[maxCNAMElen] = '\0'; // just in case
    RTCPInstance* rtcp
    = RTCPInstance::createNew(*env, &rtcpGroupsock,
                estimatedSessionBandwidth, CNAME,
                videoSink, NULL /* we're a server */,
                True /* we're a SSM source */);
    // Note: This starts RTCP running automatically

    /*Create RTSP SERVER*/
    RTSPServer* rtspServer = RTSPServer::createNew(*env, 8554);
    if (rtspServer == NULL) 
    {
         *env << "Failed to create RTSP server: " << env->getResultMsg() << "\n";
         exit(1);
    }
    ServerMediaSession* sms
        = ServerMediaSession::createNew(*env, "IPCAM @ TeReSol","UPP Buffer" ,
           "Session streamed by \"testH264VideoStreamer\"",
                       True /*SSM*/);
    sms->addSubsession(PassiveServerMediaSubsession::createNew(*videoSink, rtcp));
    rtspServer->addServerMediaSession(sms);

    char* url = rtspServer->rtspURL(sms);
    *env << "Play this stream using the URL \"" << url << "\"\n";
    delete[] url;

    // Start the streaming:
    *env << "Beginning streaming...\n";
    play();

    env->taskScheduler().doEventLoop(); // does not return

    return 0; // only to prevent compiler warning
}



//----------------------------------------------------------------------------------
// afterPlaying() -> Defines what to do once a buffer is streamed
//----------------------------------------------------------------------------------
void afterPlaying(void* /*clientData*/) 
{
    *env << "...done reading from upp buffer\n";
    //videoSink->stopPlaying();
    //Medium::close(videoSource);
    // Note that this also closes the input file that this source read from.

    // Start playing once again to get the next stream      
    play();

    /* We don't need to close the dev as long as we're reading from it. But if we do, use: close( "/dev/upp", O_RDWR);*/ 

}



//----------------------------------------------------------------------------------------------
// play() Method -> Defines how to read and what to make of the input stream 
//----------------------------------------------------------------------------------------------
void play()
{



    /* Read nbytes of buffer (sizeof buf ) from the filedescriptor stream and assign them to address where buf is located */
    read(stream, &buf, sizeof buf);
    printf("Reading from UPP in to Buffer");

    /*Open the input file as a 'byte-stream file source': */
    ByteStreamMemoryBufferSource* buffSource
        = ByteStreamMemoryBufferSource::createNew(*env, buf, sizeof buf,False/*Empty Buffer After Reading*/);
    /*By passing False in the above creatNew() method means that the buffer would be read at once */

    if (buffSource == NULL) 
    {
      *env << "Unable to read from\"" << "Buffer"
           << "\" as a byte-stream source\n";
          exit(1);
    }

    FramedSource* videoES = buffSource;
    // Create a framer for the Video Elementary Stream:
    videoSource = H264VideoStreamFramer::createNew(*env, videoES,False);
    // Finally, start playing:
    *env << "Beginning to read from UPP...\n";
    videoSink->startPlaying(*videoSource, afterPlaying, videoSink);
}

O problema é que o código é compilado com êxito, mas não consigo obter a saída desejada. o fluxo RTSP no VLC player está no modo de reprodução, mas não consigo ver nenhum vídeo. Ficaria muito grato por qualquer ajuda nesse assunto. Posso ser um pouco vago na minha descrição, mas fico feliz em explicar melhor qualquer parte que seja necessária.