void Context::getTracks(const char * file)
{
int i = 0;
bool audioTrack = false, videoTrack = false;
if (!isOpen()) throw Exception(file, "File is closed.");
for (;;)
{
TrackProperties track;
if((track.hint = MP4FindTrackId(fh, i++, MP4_HINT_TRACK_TYPE, 0)) == MP4_INVALID_TRACK_ID) break;
MP4GetHintTrackRtpPayload(fh, track.hint, &track.codecName, &track.payload, NULL, NULL);
track.track = MP4GetHintTrackReferenceTrackId(fh, track.hint);
if(track.track == MP4_INVALID_TRACK_ID) continue;
track.clock = MP4GetTrackTimeScale(fh, track.hint);
if (!strcmp(MP4GetTrackType(fh, track.track), MP4_AUDIO_TRACK_TYPE)) {
audioTrack = true;
if(!strncmp(track.codecName, "PCM", 3))
track.packetLength = 20;
else
track.packetLength = track.clock = 0;
audio = track;
} else if (!strcmp(MP4GetTrackType(fh, track.track), MP4_VIDEO_TRACK_TYPE)) {
videoTrack = true;
const char * sdp = MP4GetHintTrackSdp(fh, track.hint);
const char * fmtp = strstr(sdp, "fmtp");
if (fmtp) {
// finds beginning of 'fmtp' value;
for(fmtp += 5; *fmtp != ' '; ++fmtp);
++fmtp;
const char * eol = fmtp;
for(;*eol != '\r' && *eol != '\n'; ++eol);
video.fmtp = std::string(fmtp, eol);
}
video.track = track;
}
}
if (!audioTrack || !videoTrack) throw Exception(file, "Missing audio/video track.");
}
static char* PrintHintInfo(
MP4FileHandle mp4File,
MP4TrackId trackId)
{
MP4TrackId referenceTrackId =
MP4GetHintTrackReferenceTrackId(mp4File, trackId);
char* payloadName = NULL;
if (!MP4GetHintTrackRtpPayload(mp4File, trackId, &payloadName))
return NULL;
char *sInfo = (char*)MP4Malloc(256);
snprintf(sInfo, 256,
"%u\thint\tPayload %s for track %u\n",
trackId,
payloadName,
referenceTrackId);
free(payloadName);
return sInfo;
}
int MP4Streamer::Open(const char *filename)
{
//LOg
Log(">MP4 opening [%s]\n",filename);
//Lock
pthread_mutex_lock(&mutex);
//If already opened
if (opened)
{
//Unlock
pthread_mutex_unlock(&mutex);
//Return error
return Error("Already opened\n");
}
// Open mp4 file
mp4 = MP4Read(filename);
// If not valid
if (mp4 == MP4_INVALID_FILE_HANDLE)
{
//Unlock
pthread_mutex_unlock(&mutex);
//Return error
return Error("Invalid file handle for %s\n",filename);
}
//No tracks
audio = NULL;
video = NULL;
text = NULL;
//Iterate thougth tracks
DWORD i = 0;
// Get the first hint track
MP4TrackId hintId = MP4_INVALID_TRACK_ID;
// Iterate hint tracks
do
{
// Get the next hint track
hintId = MP4FindTrackId(mp4, i++, MP4_HINT_TRACK_TYPE, 0);
Log("-Found hint track [hintId:%d]\n", hintId);
// Get asociated track
MP4TrackId trackId = MP4GetHintTrackReferenceTrackId(mp4, hintId);
// Check it's good
if (trackId != MP4_INVALID_TRACK_ID)
{
// Get track type
const char *type = MP4GetTrackType(mp4, trackId);
// Get rtp track
char *name;
BYTE payload;
MP4GetHintTrackRtpPayload(mp4, hintId, &name, &payload, NULL, NULL);
Log("-Streaming media [trackId:%d,type:\"%s\",name:\"%s\",payload:%d]\n", trackId, type, name, payload);
// Check track type
if ((strcmp(type, MP4_AUDIO_TRACK_TYPE) == 0) && !audio)
{
// Depending on the name
if (strcmp("PCMU", name) == 0)
//Create new audio track
audio = new MP4RtpTrack(MediaFrame::Audio,AudioCodec::PCMU,payload);
else if (strcmp("PCMA", name) == 0)
//Create new audio track
audio = new MP4RtpTrack(MediaFrame::Audio,AudioCodec::PCMA,payload);
else
//Skip
continue;
// Get time scale
audio->timeScale = MP4GetTrackTimeScale(mp4, hintId);
//Store the other values
audio->mp4 = mp4;
audio->hint = hintId;
audio->track = trackId;
audio->sampleId = 1;
audio->packetIndex = 0;
} else if ((strcmp(type, MP4_VIDEO_TRACK_TYPE) == 0) && !video) {
// Depending on the name
if (strcmp("H263", name) == 0)
//Create new video track
video = new MP4RtpTrack(MediaFrame::Video,VideoCodec::H263_1996,payload);
else if (strcmp("H263-1998", name) == 0)
//Create new video track
video = new MP4RtpTrack(MediaFrame::Video,VideoCodec::H263_1998,payload);
else if (strcmp("H263-2000", name) == 0)
//Create new video track
video = new MP4RtpTrack(MediaFrame::Video,VideoCodec::H263_1998,payload);
else if (strcmp("H264", name) == 0)
//Create new video track
video = new MP4RtpTrack(MediaFrame::Video,VideoCodec::H264,payload);
else
continue;
// Get time scale
video->timeScale = MP4GetTrackTimeScale(mp4, hintId);
// it's video
video->mp4 = mp4;
video->hint = hintId;
video->track = trackId;
video->sampleId = 1;
video->packetIndex = 0;
}
}
} while (hintId != MP4_INVALID_TRACK_ID);
// Get the first text
MP4TrackId textId = MP4FindTrackId(mp4, 0, MP4_TEXT_TRACK_TYPE, 0);
Log("-Found text track [%d]\n",textId);
// Iterate hint tracks
if (textId != MP4_INVALID_TRACK_ID)
{
//We have it
text = new MP4TextTrack();
//Set values
text->mp4 = mp4;
text->track = textId;
text->sampleId = 1;
// Get time scale
text->timeScale = MP4GetTrackTimeScale(mp4, textId);
}
//We are opened
opened = true;
//Unlock
pthread_mutex_unlock(&mutex);
return 1;
}
