2002-08-05 02:39:07 +02:00
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extern "C" {
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#include "demux_rtp.h"
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#include "stheader.h"
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}
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#include "BasicUsageEnvironment.hh"
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#include "liveMedia.hh"
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#include <unistd.h>
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////////// Routines (with C-linkage) that interface between "mplayer"
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////////// and the "LIVE.COM Streaming Media" libraries:
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extern "C" stream_t* stream_open_sdp(int fd, off_t fileSize,
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int* file_format) {
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*file_format = DEMUXER_TYPE_RTP;
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stream_t* newStream = NULL;
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do {
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char* sdpDescription = (char*)malloc(fileSize+1);
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if (sdpDescription == NULL) break;
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ssize_t numBytesRead = read(fd, sdpDescription, fileSize);
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if (numBytesRead != fileSize) break;
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sdpDescription[fileSize] = '\0'; // to be safe
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newStream = (stream_t*)calloc(sizeof (stream_t), 1);
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if (newStream == NULL) break;
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// Store the SDP description in the 'priv' field, for later use:
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newStream->priv = sdpDescription;
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} while (0);
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return newStream;
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}
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extern "C" int _rtsp_streaming_seek(int /*fd*/, off_t /*pos*/,
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streaming_ctrl_t* /*streaming_ctrl*/) {
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return -1; // For now, we don't handle RTSP stream seeking
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}
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extern "C" int rtsp_streaming_start(stream_t* stream) {
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stream->streaming_ctrl->streaming_seek = _rtsp_streaming_seek;
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return 0;
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}
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// A data structure representing a buffer being read:
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class ReadBufferQueue; // forward
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class ReadBuffer {
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public:
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ReadBuffer(ReadBufferQueue* ourQueue, demux_packet_t* dp);
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virtual ~ReadBuffer();
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Boolean enqueue();
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demux_packet_t* dp() const { return fDP; }
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ReadBufferQueue* ourQueue() { return fOurQueue; }
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ReadBuffer* next;
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private:
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demux_packet_t* fDP;
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ReadBufferQueue* fOurQueue;
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};
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class ReadBufferQueue {
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public:
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ReadBufferQueue(MediaSubsession* subsession, demuxer_t* demuxer,
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char const* tag);
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virtual ~ReadBufferQueue();
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ReadBuffer* dequeue();
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FramedSource* readSource() const { return fReadSource; }
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demuxer_t* ourDemuxer() const { return fOurDemuxer; }
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char const* tag() const { return fTag; }
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ReadBuffer* head;
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ReadBuffer* tail;
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char blockingFlag; // used to implement synchronous reads
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unsigned counter; // used for debugging
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private:
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FramedSource* fReadSource;
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demuxer_t* fOurDemuxer;
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char const* fTag; // used for debugging
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};
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// A structure of RTP-specific state, kept so that we can cleanly
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// reclaim it:
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typedef struct RTPState {
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char const* sdpDescription;
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RTSPClient* rtspClient;
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MediaSession* mediaSession;
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ReadBufferQueue* audioBufferQueue;
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ReadBufferQueue* videoBufferQueue;
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int isMPEG; // TRUE for MPEG audio, video, or transport streams
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};
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extern "C" void demux_open_rtp(demuxer_t* demuxer) {
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do {
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TaskScheduler* scheduler = BasicTaskScheduler::createNew();
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if (scheduler == NULL) break;
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UsageEnvironment* env = BasicUsageEnvironment::createNew(*scheduler);
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if (env == NULL) break;
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RTSPClient* rtspClient = NULL;
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int isMPEG = 0;
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// Look at the stream's 'priv' field to see if we were initiated
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// via a SDP description:
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char* sdpDescription = (char*)(demuxer->stream->priv);
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if (sdpDescription == NULL) {
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// We weren't given a SDP description directly, so assume that
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// we were give a RTSP URL
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char const* url = demuxer->stream->streaming_ctrl->url->url;
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extern int verbose;
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2002-08-29 22:19:33 +02:00
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rtspClient = RTSPClient::createNew(*env, verbose, "mplayer");
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2002-08-05 02:39:07 +02:00
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if (rtspClient == NULL) {
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fprintf(stderr, "Failed to create RTSP client: %s\n",
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env->getResultMsg());
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break;
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}
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sdpDescription = rtspClient->describeURL(url);
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if (sdpDescription == NULL) {
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fprintf(stderr, "Failed to get a SDP description from URL \"%s\": %s\n",
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url, env->getResultMsg());
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break;
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}
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}
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// Now that we have a SDP description, create a MediaSession from it:
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MediaSession* mediaSession = MediaSession::createNew(*env, sdpDescription);
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if (mediaSession == NULL) break;
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// Create RTP receivers (sources) for each subsession:
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MediaSubsessionIterator iter(*mediaSession);
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MediaSubsession* subsession;
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MediaSubsession* audioSubsession = NULL;
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MediaSubsession* videoSubsession = NULL;
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while ((subsession = iter.next()) != NULL) {
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// Ignore any subsession that's not audio or video:
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if (strcmp(subsession->mediumName(), "audio") == 0) {
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audioSubsession = subsession;
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} else if (strcmp(subsession->mediumName(), "video") == 0) {
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videoSubsession = subsession;
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} else {
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continue;
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}
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if (!subsession->initiate()) {
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fprintf(stderr, "Failed to initiate \"%s/%s\" RTP subsession: %s\n", subsession->mediumName(), subsession->codecName(), env->getResultMsg());
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} else {
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fprintf(stderr, "Initiated \"%s/%s\" RTP subsession\n", subsession->mediumName(), subsession->codecName());
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if (rtspClient != NULL) {
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// Issue RTSP "SETUP" and "PLAY" commands on the chosen subsession:
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if (!rtspClient->setupMediaSubsession(*subsession)) break;
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if (!rtspClient->playMediaSubsession(*subsession)) break;
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}
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// Now that the subsession is ready to be read, do additional
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// mplayer-specific initialization on it:
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if (subsession == videoSubsession) {
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// Create a dummy video stream header
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// to make the main mplayer code happy:
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sh_video_t* sh_video = new_sh_video(demuxer,0);
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2002-08-14 23:56:31 +02:00
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BITMAPINFOHEADER* bih
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= (BITMAPINFOHEADER*)calloc(1,sizeof(BITMAPINFOHEADER));
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bih->biSize = sizeof(BITMAPINFOHEADER);
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sh_video->bih = bih;
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2002-08-05 02:39:07 +02:00
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demux_stream_t* d_video = demuxer->video;
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d_video->sh = sh_video; sh_video->ds = d_video;
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2002-08-14 23:56:31 +02:00
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// Map known video MIME types to the BITMAPINFOHEADER parameters
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// that this program uses. (Note that not all types need all
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// of the parameters to be set.)
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2002-08-05 02:39:07 +02:00
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if (strcmp(subsession->codecName(), "MPV") == 0 ||
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strcmp(subsession->codecName(), "MP1S") == 0 ||
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strcmp(subsession->codecName(), "MP2T") == 0) {
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isMPEG = 1;
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} else if (strcmp(subsession->codecName(), "H263") == 0 ||
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strcmp(subsession->codecName(), "H263-1998") == 0) {
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2002-08-14 23:56:31 +02:00
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bih->biCompression = sh_video->format
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= mmioFOURCC('H','2','6','3');
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2002-08-05 02:39:07 +02:00
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} else if (strcmp(subsession->codecName(), "H261") == 0) {
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2002-08-14 23:56:31 +02:00
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bih->biCompression = sh_video->format
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= mmioFOURCC('H','2','6','1');
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2002-08-05 02:39:07 +02:00
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} else {
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fprintf(stderr,
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"Unknown mplayer format code for MIME type \"video/%s\"\n",
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subsession->codecName());
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}
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} else if (subsession == audioSubsession) {
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// Create a dummy audio stream header
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// to make the main mplayer code happy:
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sh_audio_t* sh_audio = new_sh_audio(demuxer,0);
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2002-08-14 23:56:31 +02:00
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WAVEFORMATEX* wf = (WAVEFORMATEX*)calloc(1,sizeof(WAVEFORMATEX));
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sh_audio->wf = wf;
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2002-08-05 02:39:07 +02:00
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demux_stream_t* d_audio = demuxer->audio;
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d_audio->sh = sh_audio; sh_audio->ds = d_audio;
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2002-08-14 23:56:31 +02:00
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// Map known audio MIME types to the WAVEFORMATEX parameters
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// that this program uses. (Note that not all types need all
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// of the parameters to be set.)
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wf->nSamplesPerSec
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= subsession->rtpSource()->timestampFrequency(); // by default
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2002-08-05 02:39:07 +02:00
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if (strcmp(subsession->codecName(), "MPA") == 0 ||
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strcmp(subsession->codecName(), "MPA-ROBUST") == 0 ||
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strcmp(subsession->codecName(), "X-MP3-DRAFT-00") == 0) {
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2002-08-14 23:56:31 +02:00
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wf->wFormatTag = sh_audio->format = 0x55;
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// Note: 0x55 is for layer III, but should work for I,II also
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wf->nSamplesPerSec = 0; // sample rate is deduced from the data
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2002-08-05 02:39:07 +02:00
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} else if (strcmp(subsession->codecName(), "AC3") == 0) {
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2002-08-14 23:56:31 +02:00
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wf->wFormatTag = sh_audio->format = 0x2000;
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wf->nSamplesPerSec = 0; // sample rate is deduced from the data
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2002-08-05 02:39:07 +02:00
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} else if (strcmp(subsession->codecName(), "PCMU") == 0) {
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2002-08-14 23:56:31 +02:00
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wf->wFormatTag = sh_audio->format = 0x7;
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wf->nChannels = 1;
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wf->nAvgBytesPerSec = 8000;
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wf->nBlockAlign = 1;
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wf->wBitsPerSample = 8;
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wf->cbSize = 0;
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2002-08-05 02:39:07 +02:00
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} else if (strcmp(subsession->codecName(), "PCMA") == 0) {
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2002-08-14 23:56:31 +02:00
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wf->wFormatTag = sh_audio->format = 0x6;
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wf->nChannels = 1;
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wf->nAvgBytesPerSec = 8000;
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wf->nBlockAlign = 1;
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wf->wBitsPerSample = 8;
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wf->cbSize = 0;
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2002-08-05 02:39:07 +02:00
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} else if (strcmp(subsession->codecName(), "GSM") == 0) {
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2002-08-14 23:56:31 +02:00
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wf->wFormatTag = sh_audio->format = 0x31;
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wf->nChannels = 1;
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wf->nAvgBytesPerSec = 1650;
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wf->nBlockAlign = 33;
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wf->wBitsPerSample = 16;
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wf->cbSize = 0;
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2002-08-05 02:39:07 +02:00
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} else {
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fprintf(stderr,
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"Unknown mplayer format code for MIME type \"audio/%s\"\n",
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subsession->codecName());
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}
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}
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}
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}
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// Hack: Create a 'RTPState' structure containing the state that
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// we just created, and store it in the demuxer's 'priv' field:
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RTPState* rtpState = new RTPState;
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rtpState->sdpDescription = sdpDescription;
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rtpState->rtspClient = rtspClient;
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rtpState->mediaSession = mediaSession;
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rtpState->audioBufferQueue
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= new ReadBufferQueue(audioSubsession, demuxer, "audio");
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rtpState->videoBufferQueue
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= new ReadBufferQueue(videoSubsession, demuxer, "video");
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rtpState->isMPEG = isMPEG;
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demuxer->priv = rtpState;
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} while (0);
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}
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extern "C" int demux_is_mpeg_rtp_stream(demuxer_t* demuxer) {
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// Get the RTP state that was stored in the demuxer's 'priv' field:
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RTPState* rtpState = (RTPState*)(demuxer->priv);
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return rtpState->isMPEG;
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}
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static Boolean deliverBufferIfAvailable(ReadBufferQueue* bufferQueue,
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demux_stream_t* ds); // forward
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extern "C" int demux_rtp_fill_buffer(demuxer_t* demuxer, demux_stream_t* ds) {
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// Get a filled-in "demux_packet" from the RTP source, and deliver it.
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// Note that this is called as a synchronous read operation, so it needs
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// to block in the (hopefully infrequent) case where no packet is
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// immediately available.
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// Begin by finding the buffer queue that we want to read from:
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// (Get this from the RTP state, which we stored in
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// the demuxer's 'priv' field)
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RTPState* rtpState = (RTPState*)(demuxer->priv);
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ReadBufferQueue* bufferQueue = NULL;
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if (ds == demuxer->video) {
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bufferQueue = rtpState->videoBufferQueue;
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} else if (ds == demuxer->audio) {
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bufferQueue = rtpState->audioBufferQueue;
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} else {
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fprintf(stderr, "demux_rtp_fill_buffer: internal error: unknown stream\n");
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return 0;
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}
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if (bufferQueue == NULL || bufferQueue->readSource() == NULL) {
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fprintf(stderr, "demux_rtp_fill_buffer failed: no appropriate RTP subsession has been set up\n");
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return 0;
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}
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// Check whether there's a full buffer to deliver to the client:
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bufferQueue->blockingFlag = 0;
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while (!deliverBufferIfAvailable(bufferQueue, ds)) {
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// Because we weren't able to deliver a buffer to the client immediately,
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// block myself until one comes available:
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TaskScheduler& scheduler
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= bufferQueue->readSource()->envir().taskScheduler();
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scheduler.blockMyself(&bufferQueue->blockingFlag);
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}
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if (demuxer->stream->eof) return 0; // source stream has closed down
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return 1;
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}
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extern "C" void demux_close_rtp(demuxer_t* demuxer) {
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// Reclaim all RTP-related state:
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// Get the RTP state that was stored in the demuxer's 'priv' field:
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RTPState* rtpState = (RTPState*)(demuxer->priv);
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2002-08-29 22:19:33 +02:00
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if (rtpState == NULL) return;
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2002-08-05 02:39:07 +02:00
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UsageEnvironment* env = NULL;
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TaskScheduler* scheduler = NULL;
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if (rtpState->mediaSession != NULL) {
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env = &(rtpState->mediaSession->envir());
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scheduler = &(env->taskScheduler());
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}
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Medium::close(rtpState->mediaSession);
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Medium::close(rtpState->rtspClient);
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delete rtpState->audioBufferQueue;
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delete rtpState->videoBufferQueue;
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delete rtpState->sdpDescription;
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delete rtpState;
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delete env; delete scheduler;
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}
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////////// Extra routines that help implement the above interface functions:
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static void scheduleNewBufferRead(ReadBufferQueue* bufferQueue); // forward
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static Boolean deliverBufferIfAvailable(ReadBufferQueue* bufferQueue,
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demux_stream_t* ds) {
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Boolean deliveredBuffer = False;
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ReadBuffer* readBuffer = bufferQueue->dequeue();
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if (readBuffer != NULL) {
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// Append the packet to the reader's DS stream:
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ds_add_packet(ds, readBuffer->dp());
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deliveredBuffer = True;
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}
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// Arrange to read a new packet into this queue:
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scheduleNewBufferRead(bufferQueue);
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return deliveredBuffer;
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}
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static void afterReading(void* clientData, unsigned frameSize,
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struct timeval presentationTime); // forward
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static void onSourceClosure(void* clientData); // forward
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static void scheduleNewBufferRead(ReadBufferQueue* bufferQueue) {
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if (bufferQueue->readSource()->isCurrentlyAwaitingData()) return;
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// a read from this source is already in progress
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// Allocate a new packet buffer, and arrange to read into it:
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unsigned const bufferSize = 30000; // >= the largest conceivable RTP packet
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demux_packet_t* dp = new_demux_packet(bufferSize);
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if (dp == NULL) return;
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ReadBuffer* readBuffer = new ReadBuffer(bufferQueue, dp);
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// Schedule the read operation:
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bufferQueue->readSource()->getNextFrame(dp->buffer, bufferSize,
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afterReading, readBuffer,
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onSourceClosure, readBuffer);
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}
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static void afterReading(void* clientData, unsigned frameSize,
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struct timeval /*presentationTime*/) {
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ReadBuffer* readBuffer = (ReadBuffer*)clientData;
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ReadBufferQueue* bufferQueue = readBuffer->ourQueue();
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demuxer_t* demuxer = bufferQueue->ourDemuxer();
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if (frameSize > 0) demuxer->stream->eof = 0;
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demux_packet_t* dp = readBuffer->dp();
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dp->len = frameSize;
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dp->pts = 0;
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dp->pos = demuxer->filepos;
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demuxer->filepos += frameSize;
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if (!readBuffer->enqueue()) {
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// The queue is full, so discard the buffer:
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delete readBuffer;
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}
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// Signal any pending 'blockMyself()' call on this queue:
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bufferQueue->blockingFlag = ~0;
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// Finally, arrange to do another read, if appropriate
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scheduleNewBufferRead(bufferQueue);
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}
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static void onSourceClosure(void* clientData) {
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ReadBuffer* readBuffer = (ReadBuffer*)clientData;
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ReadBufferQueue* bufferQueue = readBuffer->ourQueue();
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demuxer_t* demuxer = bufferQueue->ourDemuxer();
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demuxer->stream->eof = 1;
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// Signal any pending 'blockMyself()' call on this queue:
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bufferQueue->blockingFlag = ~0;
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}
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////////// "ReadBuffer" and "ReadBufferQueue" implementation:
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#define MAX_QUEUE_SIZE 5
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ReadBuffer::ReadBuffer(ReadBufferQueue* ourQueue, demux_packet_t* dp)
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: next(NULL), fDP(dp), fOurQueue(ourQueue) {
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}
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Boolean ReadBuffer::enqueue() {
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if (fOurQueue->counter >= MAX_QUEUE_SIZE) {
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// This queue is full. Clear out an old entry from it, so that
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// this new one will fit:
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while (fOurQueue->counter >= MAX_QUEUE_SIZE) {
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delete fOurQueue->dequeue();
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}
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}
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// Add ourselves to the tail of our queue:
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if (fOurQueue->tail == NULL) {
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fOurQueue->head = this;
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} else {
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fOurQueue->tail->next = this;
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}
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fOurQueue->tail = this;
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|
|
++fOurQueue->counter;
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|
return True;
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}
|
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|
|
ReadBuffer::~ReadBuffer() {
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|
|
free_demux_packet(fDP);
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delete next;
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}
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|
ReadBufferQueue::ReadBufferQueue(MediaSubsession* subsession,
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|
demuxer_t* demuxer, char const* tag)
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|
: head(NULL), tail(NULL), counter(0),
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|
|
fReadSource(subsession == NULL ? NULL : subsession->readSource()),
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|
|
fOurDemuxer(demuxer), fTag(strdup(tag)) {
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}
|
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|
ReadBufferQueue::~ReadBufferQueue() {
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|
delete head;
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|
delete fTag;
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|
}
|
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|
|
ReadBuffer* ReadBufferQueue::dequeue() {
|
|
|
|
ReadBuffer* readBuffer = head;
|
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|
|
if (readBuffer != NULL) {
|
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|
|
head = readBuffer->next;
|
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|
|
if (head == NULL) tail = NULL;
|
|
|
|
--counter;
|
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|
|
readBuffer->next = NULL;
|
|
|
|
}
|
|
|
|
return readBuffer;
|
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|
|
}
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